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 void 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);
706 * This is the usual interrupt handler which will be called during a packet
707 * command. We will transfer some of the data (as requested by the drive) and
708 * will re-point interrupt handler to us. When data transfer is finished, we
709 * will act according to the algorithm described before
712 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
714 idetape_tape_t *tape = drive->driver_data;
716 return ide_pc_intr(drive, tape->pc, idetape_pc_intr, IDETAPE_WAIT_CMD,
717 NULL, idetape_update_buffers, idetape_retry_pc,
718 ide_tape_handle_dsc, ide_tape_io_buffers);
722 * Packet Command Interface
724 * The current Packet Command is available in tape->pc, and will not change
725 * until we finish handling it. Each packet command is associated with a
726 * callback function that will be called when the command is finished.
728 * The handling will be done in three stages:
730 * 1. idetape_issue_pc will send the packet command to the drive, and will set
731 * the interrupt handler to idetape_pc_intr.
733 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
734 * repeated until the device signals us that no more interrupts will be issued.
736 * 3. ATAPI Tape media access commands have immediate status with a delayed
737 * process. In case of a successful initiation of a media access packet command,
738 * the DSC bit will be set when the actual execution of the command is finished.
739 * Since the tape drive will not issue an interrupt, we have to poll for this
740 * event. In this case, we define the request as "low priority request" by
741 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
744 * ide.c will then give higher priority to requests which originate from the
745 * other device, until will change rq_status to RQ_ACTIVE.
747 * 4. When the packet command is finished, it will be checked for errors.
749 * 5. In case an error was found, we queue a request sense packet command in
750 * front of the request queue and retry the operation up to
751 * IDETAPE_MAX_PC_RETRIES times.
753 * 6. In case no error was found, or we decided to give up and not to retry
754 * again, the callback function will be called and then we will handle the next
757 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
759 idetape_tape_t *tape = drive->driver_data;
761 return ide_transfer_pc(drive, tape->pc, idetape_pc_intr,
762 IDETAPE_WAIT_CMD, NULL);
765 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
766 struct ide_atapi_pc *pc)
768 idetape_tape_t *tape = drive->driver_data;
770 if (tape->pc->c[0] == REQUEST_SENSE &&
771 pc->c[0] == REQUEST_SENSE) {
772 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
773 "Two request sense in serial were issued\n");
776 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
777 tape->failed_pc = pc;
778 /* Set the current packet command */
781 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
782 (pc->flags & PC_FLAG_ABORT)) {
784 * We will "abort" retrying a packet command in case legitimate
785 * error code was received (crossing a filemark, or end of the
786 * media, for example).
788 if (!(pc->flags & PC_FLAG_ABORT)) {
789 if (!(pc->c[0] == TEST_UNIT_READY &&
790 tape->sense_key == 2 && tape->asc == 4 &&
791 (tape->ascq == 1 || tape->ascq == 8))) {
792 printk(KERN_ERR "ide-tape: %s: I/O error, "
793 "pc = %2x, key = %2x, "
794 "asc = %2x, ascq = %2x\n",
795 tape->name, pc->c[0],
796 tape->sense_key, tape->asc,
800 pc->error = IDETAPE_ERROR_GENERAL;
802 tape->failed_pc = NULL;
803 drive->pc_callback(drive);
806 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
810 return ide_issue_pc(drive, pc, idetape_transfer_pc,
811 IDETAPE_WAIT_CMD, NULL);
814 /* A mode sense command is used to "sense" tape parameters. */
815 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
818 pc->c[0] = MODE_SENSE;
819 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
820 /* DBD = 1 - Don't return block descriptors */
822 pc->c[2] = page_code;
824 * Changed pc->c[3] to 0 (255 will at best return unused info).
826 * For SCSI this byte is defined as subpage instead of high byte
827 * of length and some IDE drives seem to interpret it this way
828 * and return an error when 255 is used.
831 /* We will just discard data in that case */
833 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
835 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
841 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
843 ide_hwif_t *hwif = drive->hwif;
844 idetape_tape_t *tape = drive->driver_data;
845 struct ide_atapi_pc *pc = tape->pc;
848 stat = hwif->tp_ops->read_status(hwif);
850 if (stat & ATA_DSC) {
851 if (stat & ATA_ERR) {
853 if (pc->c[0] != TEST_UNIT_READY)
854 printk(KERN_ERR "ide-tape: %s: I/O error, ",
856 /* Retry operation */
857 idetape_retry_pc(drive);
862 pc->error = IDETAPE_ERROR_GENERAL;
863 tape->failed_pc = NULL;
865 drive->pc_callback(drive);
869 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
870 struct ide_atapi_pc *pc, struct request *rq,
873 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
874 unsigned int length = rq->current_nr_sectors;
877 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
881 pc->buf_size = length * tape->blk_size;
882 pc->req_xfer = pc->buf_size;
883 if (pc->req_xfer == tape->buffer_size)
884 pc->flags |= PC_FLAG_DMA_OK;
886 if (opcode == READ_6) {
888 atomic_set(&bh->b_count, 0);
889 } else if (opcode == WRITE_6) {
891 pc->flags |= PC_FLAG_WRITING;
892 pc->b_data = bh->b_data;
893 pc->b_count = atomic_read(&bh->b_count);
896 memcpy(rq->cmd, pc->c, 12);
899 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
900 struct request *rq, sector_t block)
902 ide_hwif_t *hwif = drive->hwif;
903 idetape_tape_t *tape = drive->driver_data;
904 struct ide_atapi_pc *pc = NULL;
905 struct request *postponed_rq = tape->postponed_rq;
908 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
909 " current_nr_sectors: %u\n",
910 (unsigned long long)rq->sector, rq->nr_sectors,
911 rq->current_nr_sectors);
913 if (!blk_special_request(rq)) {
914 /* We do not support buffer cache originated requests. */
915 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
916 "request queue (%d)\n", drive->name, rq->cmd_type);
917 ide_end_request(drive, 0, 0);
921 /* Retry a failed packet command */
922 if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) {
923 pc = tape->failed_pc;
927 if (postponed_rq != NULL)
928 if (rq != postponed_rq) {
929 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
930 "Two DSC requests were queued\n");
931 idetape_end_request(drive, 0, 0);
935 tape->postponed_rq = NULL;
938 * If the tape is still busy, postpone our request and service
939 * the other device meanwhile.
941 stat = hwif->tp_ops->read_status(hwif);
943 if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2))
944 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
946 if (drive->post_reset == 1) {
947 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
948 drive->post_reset = 0;
951 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
952 (stat & ATA_DSC) == 0) {
953 if (postponed_rq == NULL) {
954 tape->dsc_polling_start = jiffies;
955 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
956 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
957 } else if (time_after(jiffies, tape->dsc_timeout)) {
958 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
960 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
961 idetape_media_access_finished(drive);
964 return ide_do_reset(drive);
966 } else if (time_after(jiffies,
967 tape->dsc_polling_start +
968 IDETAPE_DSC_MA_THRESHOLD))
969 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
970 idetape_postpone_request(drive);
973 if (rq->cmd[13] & REQ_IDETAPE_READ) {
974 pc = &tape->queued_pc;
975 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
978 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
979 pc = &tape->queued_pc;
980 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
983 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
984 pc = (struct ide_atapi_pc *) rq->buffer;
985 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
986 rq->cmd[13] |= REQ_IDETAPE_PC2;
989 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
990 idetape_media_access_finished(drive);
996 return idetape_issue_pc(drive, pc);
1000 * The function below uses __get_free_pages to allocate a data buffer of size
1001 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
1004 * It returns a pointer to the newly allocated buffer, or NULL in case of
1007 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
1008 int full, int clear)
1010 struct idetape_bh *prev_bh, *bh, *merge_bh;
1011 int pages = tape->pages_per_buffer;
1012 unsigned int order, b_allocd;
1013 char *b_data = NULL;
1015 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1020 order = fls(pages) - 1;
1021 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
1024 b_allocd = (1 << order) * PAGE_SIZE;
1028 memset(bh->b_data, 0, b_allocd);
1029 bh->b_reqnext = NULL;
1030 bh->b_size = b_allocd;
1031 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1034 order = fls(pages) - 1;
1035 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
1038 b_allocd = (1 << order) * PAGE_SIZE;
1041 memset(b_data, 0, b_allocd);
1043 /* newly allocated page frames below buffer header or ...*/
1044 if (bh->b_data == b_data + b_allocd) {
1045 bh->b_size += b_allocd;
1046 bh->b_data -= b_allocd;
1048 atomic_add(b_allocd, &bh->b_count);
1051 /* they are above the header */
1052 if (b_data == bh->b_data + bh->b_size) {
1053 bh->b_size += b_allocd;
1055 atomic_add(b_allocd, &bh->b_count);
1059 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1061 free_pages((unsigned long) b_data, order);
1064 bh->b_reqnext = NULL;
1065 bh->b_data = b_data;
1066 bh->b_size = b_allocd;
1067 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1068 prev_bh->b_reqnext = bh;
1073 bh->b_size -= tape->excess_bh_size;
1075 atomic_sub(tape->excess_bh_size, &bh->b_count);
1078 ide_tape_kfree_buffer(tape);
1082 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
1083 const char __user *buf, int n)
1085 struct idetape_bh *bh = tape->bh;
1091 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1095 count = min((unsigned int)
1096 (bh->b_size - atomic_read(&bh->b_count)),
1098 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
1102 atomic_add(count, &bh->b_count);
1104 if (atomic_read(&bh->b_count) == bh->b_size) {
1107 atomic_set(&bh->b_count, 0);
1114 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
1117 struct idetape_bh *bh = tape->bh;
1123 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1127 count = min(tape->b_count, n);
1128 if (copy_to_user(buf, tape->b_data, count))
1131 tape->b_data += count;
1132 tape->b_count -= count;
1134 if (!tape->b_count) {
1138 tape->b_data = bh->b_data;
1139 tape->b_count = atomic_read(&bh->b_count);
1146 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1148 struct idetape_bh *bh = tape->merge_bh;
1149 tape->bh = tape->merge_bh;
1151 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1152 atomic_set(&bh->b_count, 0);
1154 tape->b_data = bh->b_data;
1155 tape->b_count = atomic_read(&bh->b_count);
1160 * Write a filemark if write_filemark=1. Flush the device buffers without
1161 * writing a filemark otherwise.
1163 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1164 struct ide_atapi_pc *pc, int write_filemark)
1166 idetape_init_pc(pc);
1167 pc->c[0] = WRITE_FILEMARKS;
1168 pc->c[4] = write_filemark;
1169 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1172 static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc)
1174 idetape_init_pc(pc);
1175 pc->c[0] = TEST_UNIT_READY;
1179 * We add a special packet command request to the tail of the request queue, and
1180 * wait for it to be serviced.
1182 static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
1184 struct ide_tape_obj *tape = drive->driver_data;
1188 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1189 rq->cmd_type = REQ_TYPE_SPECIAL;
1190 rq->cmd[13] = REQ_IDETAPE_PC1;
1191 rq->buffer = (char *)pc;
1192 memcpy(rq->cmd, pc->c, 12);
1193 error = blk_execute_rq(drive->queue, tape->disk, rq, 0);
1194 blk_put_request(rq);
1198 static void idetape_create_load_unload_cmd(ide_drive_t *drive,
1199 struct ide_atapi_pc *pc, int cmd)
1201 idetape_init_pc(pc);
1202 pc->c[0] = START_STOP;
1204 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1207 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1209 idetape_tape_t *tape = drive->driver_data;
1210 struct ide_atapi_pc pc;
1211 int load_attempted = 0;
1213 /* Wait for the tape to become ready */
1214 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1216 while (time_before(jiffies, timeout)) {
1217 idetape_create_test_unit_ready_cmd(&pc);
1218 if (!idetape_queue_pc_tail(drive, &pc))
1220 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1221 || (tape->asc == 0x3A)) {
1225 idetape_create_load_unload_cmd(drive, &pc,
1226 IDETAPE_LU_LOAD_MASK);
1227 idetape_queue_pc_tail(drive, &pc);
1229 /* not about to be ready */
1230 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1231 (tape->ascq == 1 || tape->ascq == 8)))
1238 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1240 struct ide_atapi_pc pc;
1243 idetape_create_write_filemark_cmd(drive, &pc, 0);
1244 rc = idetape_queue_pc_tail(drive, &pc);
1247 idetape_wait_ready(drive, 60 * 5 * HZ);
1251 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1253 idetape_init_pc(pc);
1254 pc->c[0] = READ_POSITION;
1258 static int idetape_read_position(ide_drive_t *drive)
1260 idetape_tape_t *tape = drive->driver_data;
1261 struct ide_atapi_pc pc;
1264 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1266 idetape_create_read_position_cmd(&pc);
1267 if (idetape_queue_pc_tail(drive, &pc))
1269 position = tape->first_frame;
1273 static void idetape_create_locate_cmd(ide_drive_t *drive,
1274 struct ide_atapi_pc *pc,
1275 unsigned int block, u8 partition, int skip)
1277 idetape_init_pc(pc);
1278 pc->c[0] = POSITION_TO_ELEMENT;
1280 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1281 pc->c[8] = partition;
1282 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1285 static int idetape_create_prevent_cmd(ide_drive_t *drive,
1286 struct ide_atapi_pc *pc, int prevent)
1288 idetape_tape_t *tape = drive->driver_data;
1290 /* device supports locking according to capabilities page */
1291 if (!(tape->caps[6] & 0x01))
1294 idetape_init_pc(pc);
1295 pc->c[0] = ALLOW_MEDIUM_REMOVAL;
1300 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1302 idetape_tape_t *tape = drive->driver_data;
1304 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1307 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1308 tape->merge_bh_size = 0;
1309 if (tape->merge_bh != NULL) {
1310 ide_tape_kfree_buffer(tape);
1311 tape->merge_bh = NULL;
1314 tape->chrdev_dir = IDETAPE_DIR_NONE;
1318 * Position the tape to the requested block using the LOCATE packet command.
1319 * A READ POSITION command is then issued to check where we are positioned. Like
1320 * all higher level operations, we queue the commands at the tail of the request
1321 * queue and wait for their completion.
1323 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1324 u8 partition, int skip)
1326 idetape_tape_t *tape = drive->driver_data;
1328 struct ide_atapi_pc pc;
1330 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1331 __ide_tape_discard_merge_buffer(drive);
1332 idetape_wait_ready(drive, 60 * 5 * HZ);
1333 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1334 retval = idetape_queue_pc_tail(drive, &pc);
1338 idetape_create_read_position_cmd(&pc);
1339 return (idetape_queue_pc_tail(drive, &pc));
1342 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1343 int restore_position)
1345 idetape_tape_t *tape = drive->driver_data;
1348 __ide_tape_discard_merge_buffer(drive);
1349 if (restore_position) {
1350 position = idetape_read_position(drive);
1351 seek = position > 0 ? position : 0;
1352 if (idetape_position_tape(drive, seek, 0, 0)) {
1353 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1354 " %s\n", tape->name, __func__);
1361 * Generate a read/write request for the block device interface and wait for it
1364 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1365 struct idetape_bh *bh)
1367 idetape_tape_t *tape = drive->driver_data;
1371 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1373 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1374 rq->cmd_type = REQ_TYPE_SPECIAL;
1376 rq->rq_disk = tape->disk;
1377 rq->special = (void *)bh;
1378 rq->sector = tape->first_frame;
1379 rq->nr_sectors = blocks;
1380 rq->current_nr_sectors = blocks;
1381 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1383 errors = rq->errors;
1384 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1385 blk_put_request(rq);
1387 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1391 idetape_init_merge_buffer(tape);
1392 if (errors == IDETAPE_ERROR_GENERAL)
1397 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1399 idetape_init_pc(pc);
1405 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1406 struct ide_atapi_pc *pc)
1408 idetape_init_pc(pc);
1409 pc->c[0] = REZERO_UNIT;
1410 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1413 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1415 idetape_init_pc(pc);
1418 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1421 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1423 idetape_init_pc(pc);
1425 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1427 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1430 /* Queue up a character device originated write request. */
1431 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1433 idetape_tape_t *tape = drive->driver_data;
1435 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1437 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1438 blocks, tape->merge_bh);
1441 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1443 idetape_tape_t *tape = drive->driver_data;
1445 struct idetape_bh *bh;
1447 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1448 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1449 " but we are not writing.\n");
1452 if (tape->merge_bh_size > tape->buffer_size) {
1453 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1454 tape->merge_bh_size = tape->buffer_size;
1456 if (tape->merge_bh_size) {
1457 blocks = tape->merge_bh_size / tape->blk_size;
1458 if (tape->merge_bh_size % tape->blk_size) {
1462 i = tape->blk_size - tape->merge_bh_size %
1464 bh = tape->bh->b_reqnext;
1466 atomic_set(&bh->b_count, 0);
1472 printk(KERN_INFO "ide-tape: bug,"
1476 min = min(i, (unsigned int)(bh->b_size -
1477 atomic_read(&bh->b_count)));
1478 memset(bh->b_data + atomic_read(&bh->b_count),
1480 atomic_add(min, &bh->b_count);
1485 (void) idetape_add_chrdev_write_request(drive, blocks);
1486 tape->merge_bh_size = 0;
1488 if (tape->merge_bh != NULL) {
1489 ide_tape_kfree_buffer(tape);
1490 tape->merge_bh = NULL;
1492 tape->chrdev_dir = IDETAPE_DIR_NONE;
1495 static int idetape_init_read(ide_drive_t *drive)
1497 idetape_tape_t *tape = drive->driver_data;
1500 /* Initialize read operation */
1501 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1502 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1503 ide_tape_flush_merge_buffer(drive);
1504 idetape_flush_tape_buffers(drive);
1506 if (tape->merge_bh || tape->merge_bh_size) {
1507 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1509 tape->merge_bh_size = 0;
1511 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1512 if (!tape->merge_bh)
1514 tape->chrdev_dir = IDETAPE_DIR_READ;
1517 * Issue a read 0 command to ensure that DSC handshake is
1518 * switched from completion mode to buffer available mode.
1519 * No point in issuing this if DSC overlap isn't supported, some
1520 * drives (Seagate STT3401A) will return an error.
1522 if (drive->dsc_overlap) {
1523 bytes_read = idetape_queue_rw_tail(drive,
1524 REQ_IDETAPE_READ, 0,
1526 if (bytes_read < 0) {
1527 ide_tape_kfree_buffer(tape);
1528 tape->merge_bh = NULL;
1529 tape->chrdev_dir = IDETAPE_DIR_NONE;
1538 /* called from idetape_chrdev_read() to service a chrdev read request. */
1539 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1541 idetape_tape_t *tape = drive->driver_data;
1543 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1545 /* If we are at a filemark, return a read length of 0 */
1546 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1549 idetape_init_read(drive);
1551 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1555 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1557 idetape_tape_t *tape = drive->driver_data;
1558 struct idetape_bh *bh;
1564 bh = tape->merge_bh;
1565 count = min(tape->buffer_size, bcount);
1567 blocks = count / tape->blk_size;
1569 atomic_set(&bh->b_count,
1570 min(count, (unsigned int)bh->b_size));
1571 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1572 count -= atomic_read(&bh->b_count);
1575 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1581 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1582 * currently support only one partition.
1584 static int idetape_rewind_tape(ide_drive_t *drive)
1587 struct ide_atapi_pc pc;
1588 idetape_tape_t *tape;
1589 tape = drive->driver_data;
1591 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1593 idetape_create_rewind_cmd(drive, &pc);
1594 retval = idetape_queue_pc_tail(drive, &pc);
1598 idetape_create_read_position_cmd(&pc);
1599 retval = idetape_queue_pc_tail(drive, &pc);
1605 /* mtio.h compatible commands should be issued to the chrdev interface. */
1606 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1609 idetape_tape_t *tape = drive->driver_data;
1610 void __user *argp = (void __user *)arg;
1612 struct idetape_config {
1613 int dsc_rw_frequency;
1614 int dsc_media_access_frequency;
1618 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1622 if (copy_from_user(&config, argp, sizeof(config)))
1624 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1627 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1628 config.nr_stages = 1;
1629 if (copy_to_user(argp, &config, sizeof(config)))
1638 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1641 idetape_tape_t *tape = drive->driver_data;
1642 struct ide_atapi_pc pc;
1643 int retval, count = 0;
1644 int sprev = !!(tape->caps[4] & 0x20);
1648 if (MTBSF == mt_op || MTBSFM == mt_op) {
1651 mt_count = -mt_count;
1654 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1655 tape->merge_bh_size = 0;
1656 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1658 ide_tape_discard_merge_buffer(drive, 0);
1664 idetape_create_space_cmd(&pc, mt_count - count,
1665 IDETAPE_SPACE_OVER_FILEMARK);
1666 return idetape_queue_pc_tail(drive, &pc);
1671 retval = idetape_space_over_filemarks(drive, MTFSF,
1675 count = (MTBSFM == mt_op ? 1 : -1);
1676 return idetape_space_over_filemarks(drive, MTFSF, count);
1678 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1685 * Our character device read / write functions.
1687 * The tape is optimized to maximize throughput when it is transferring an
1688 * integral number of the "continuous transfer limit", which is a parameter of
1689 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1691 * As of version 1.3 of the driver, the character device provides an abstract
1692 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1693 * same backup/restore procedure is supported. The driver will internally
1694 * convert the requests to the recommended transfer unit, so that an unmatch
1695 * between the user's block size to the recommended size will only result in a
1696 * (slightly) increased driver overhead, but will no longer hit performance.
1697 * This is not applicable to Onstream.
1699 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1700 size_t count, loff_t *ppos)
1702 struct ide_tape_obj *tape = ide_tape_f(file);
1703 ide_drive_t *drive = tape->drive;
1704 ssize_t bytes_read, temp, actually_read = 0, rc;
1706 u16 ctl = *(u16 *)&tape->caps[12];
1708 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1710 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1711 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1712 if (count > tape->blk_size &&
1713 (count % tape->blk_size) == 0)
1714 tape->user_bs_factor = count / tape->blk_size;
1716 rc = idetape_init_read(drive);
1721 if (tape->merge_bh_size) {
1722 actually_read = min((unsigned int)(tape->merge_bh_size),
1723 (unsigned int)count);
1724 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1726 buf += actually_read;
1727 tape->merge_bh_size -= actually_read;
1728 count -= actually_read;
1730 while (count >= tape->buffer_size) {
1731 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1732 if (bytes_read <= 0)
1734 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1737 count -= bytes_read;
1738 actually_read += bytes_read;
1741 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1742 if (bytes_read <= 0)
1744 temp = min((unsigned long)count, (unsigned long)bytes_read);
1745 if (idetape_copy_stage_to_user(tape, buf, temp))
1747 actually_read += temp;
1748 tape->merge_bh_size = bytes_read-temp;
1751 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1752 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1754 idetape_space_over_filemarks(drive, MTFSF, 1);
1758 return ret ? ret : actually_read;
1761 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1762 size_t count, loff_t *ppos)
1764 struct ide_tape_obj *tape = ide_tape_f(file);
1765 ide_drive_t *drive = tape->drive;
1766 ssize_t actually_written = 0;
1768 u16 ctl = *(u16 *)&tape->caps[12];
1770 /* The drive is write protected. */
1771 if (tape->write_prot)
1774 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1776 /* Initialize write operation */
1777 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1778 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1779 ide_tape_discard_merge_buffer(drive, 1);
1780 if (tape->merge_bh || tape->merge_bh_size) {
1781 printk(KERN_ERR "ide-tape: merge_bh_size "
1782 "should be 0 now\n");
1783 tape->merge_bh_size = 0;
1785 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1786 if (!tape->merge_bh)
1788 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1789 idetape_init_merge_buffer(tape);
1792 * Issue a write 0 command to ensure that DSC handshake is
1793 * switched from completion mode to buffer available mode. No
1794 * point in issuing this if DSC overlap isn't supported, some
1795 * drives (Seagate STT3401A) will return an error.
1797 if (drive->dsc_overlap) {
1798 ssize_t retval = idetape_queue_rw_tail(drive,
1799 REQ_IDETAPE_WRITE, 0,
1802 ide_tape_kfree_buffer(tape);
1803 tape->merge_bh = NULL;
1804 tape->chrdev_dir = IDETAPE_DIR_NONE;
1811 if (tape->merge_bh_size) {
1812 if (tape->merge_bh_size >= tape->buffer_size) {
1813 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1814 tape->merge_bh_size = 0;
1816 actually_written = min((unsigned int)
1817 (tape->buffer_size - tape->merge_bh_size),
1818 (unsigned int)count);
1819 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1821 buf += actually_written;
1822 tape->merge_bh_size += actually_written;
1823 count -= actually_written;
1825 if (tape->merge_bh_size == tape->buffer_size) {
1827 tape->merge_bh_size = 0;
1828 retval = idetape_add_chrdev_write_request(drive, ctl);
1833 while (count >= tape->buffer_size) {
1835 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1837 buf += tape->buffer_size;
1838 count -= tape->buffer_size;
1839 retval = idetape_add_chrdev_write_request(drive, ctl);
1840 actually_written += tape->buffer_size;
1845 actually_written += count;
1846 if (idetape_copy_stage_from_user(tape, buf, count))
1848 tape->merge_bh_size += count;
1850 return ret ? ret : actually_written;
1853 static int idetape_write_filemark(ide_drive_t *drive)
1855 struct ide_atapi_pc pc;
1857 /* Write a filemark */
1858 idetape_create_write_filemark_cmd(drive, &pc, 1);
1859 if (idetape_queue_pc_tail(drive, &pc)) {
1860 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1867 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1870 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1871 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1872 * usually not supported.
1874 * The following commands are currently not supported:
1876 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1877 * MT_ST_WRITE_THRESHOLD.
1879 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1881 idetape_tape_t *tape = drive->driver_data;
1882 struct ide_atapi_pc pc;
1885 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1895 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1902 if (tape->write_prot)
1904 ide_tape_discard_merge_buffer(drive, 1);
1905 for (i = 0; i < mt_count; i++) {
1906 retval = idetape_write_filemark(drive);
1912 ide_tape_discard_merge_buffer(drive, 0);
1913 if (idetape_rewind_tape(drive))
1917 ide_tape_discard_merge_buffer(drive, 0);
1918 idetape_create_load_unload_cmd(drive, &pc,
1919 IDETAPE_LU_LOAD_MASK);
1920 return idetape_queue_pc_tail(drive, &pc);
1924 * If door is locked, attempt to unlock before
1925 * attempting to eject.
1927 if (tape->door_locked) {
1928 if (idetape_create_prevent_cmd(drive, &pc, 0))
1929 if (!idetape_queue_pc_tail(drive, &pc))
1930 tape->door_locked = DOOR_UNLOCKED;
1932 ide_tape_discard_merge_buffer(drive, 0);
1933 idetape_create_load_unload_cmd(drive, &pc,
1934 !IDETAPE_LU_LOAD_MASK);
1935 retval = idetape_queue_pc_tail(drive, &pc);
1937 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1940 ide_tape_discard_merge_buffer(drive, 0);
1941 return idetape_flush_tape_buffers(drive);
1943 ide_tape_discard_merge_buffer(drive, 0);
1944 idetape_create_load_unload_cmd(drive, &pc,
1945 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1946 return idetape_queue_pc_tail(drive, &pc);
1948 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1949 return idetape_queue_pc_tail(drive, &pc);
1951 (void)idetape_rewind_tape(drive);
1952 idetape_create_erase_cmd(&pc);
1953 return idetape_queue_pc_tail(drive, &pc);
1956 if (mt_count < tape->blk_size ||
1957 mt_count % tape->blk_size)
1959 tape->user_bs_factor = mt_count / tape->blk_size;
1960 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1962 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1965 ide_tape_discard_merge_buffer(drive, 0);
1966 return idetape_position_tape(drive,
1967 mt_count * tape->user_bs_factor, tape->partition, 0);
1969 ide_tape_discard_merge_buffer(drive, 0);
1970 return idetape_position_tape(drive, 0, mt_count, 0);
1974 if (!idetape_create_prevent_cmd(drive, &pc, 1))
1976 retval = idetape_queue_pc_tail(drive, &pc);
1979 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1982 if (!idetape_create_prevent_cmd(drive, &pc, 0))
1984 retval = idetape_queue_pc_tail(drive, &pc);
1987 tape->door_locked = DOOR_UNLOCKED;
1990 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1997 * Our character device ioctls. General mtio.h magnetic io commands are
1998 * supported here, and not in the corresponding block interface. Our own
1999 * ide-tape ioctls are supported on both interfaces.
2001 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
2002 unsigned int cmd, unsigned long arg)
2004 struct ide_tape_obj *tape = ide_tape_f(file);
2005 ide_drive_t *drive = tape->drive;
2009 int block_offset = 0, position = tape->first_frame;
2010 void __user *argp = (void __user *)arg;
2012 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
2014 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
2015 ide_tape_flush_merge_buffer(drive);
2016 idetape_flush_tape_buffers(drive);
2018 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
2019 block_offset = tape->merge_bh_size /
2020 (tape->blk_size * tape->user_bs_factor);
2021 position = idetape_read_position(drive);
2027 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
2029 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
2031 memset(&mtget, 0, sizeof(struct mtget));
2032 mtget.mt_type = MT_ISSCSI2;
2033 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
2035 ((tape->blk_size * tape->user_bs_factor)
2036 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
2038 if (tape->drv_write_prot)
2039 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
2041 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
2045 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
2046 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
2050 if (tape->chrdev_dir == IDETAPE_DIR_READ)
2051 ide_tape_discard_merge_buffer(drive, 1);
2052 return idetape_blkdev_ioctl(drive, cmd, arg);
2057 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
2058 * block size with the reported value.
2060 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
2062 idetape_tape_t *tape = drive->driver_data;
2063 struct ide_atapi_pc pc;
2065 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
2066 if (idetape_queue_pc_tail(drive, &pc)) {
2067 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
2068 if (tape->blk_size == 0) {
2069 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
2070 "block size, assuming 32k\n");
2071 tape->blk_size = 32768;
2075 tape->blk_size = (pc.buf[4 + 5] << 16) +
2076 (pc.buf[4 + 6] << 8) +
2078 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
2081 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
2083 unsigned int minor = iminor(inode), i = minor & ~0xc0;
2085 idetape_tape_t *tape;
2086 struct ide_atapi_pc pc;
2089 if (i >= MAX_HWIFS * MAX_DRIVES)
2093 tape = ide_tape_chrdev_get(i);
2099 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2102 * We really want to do nonseekable_open(inode, filp); here, but some
2103 * versions of tar incorrectly call lseek on tapes and bail out if that
2104 * fails. So we disallow pread() and pwrite(), but permit lseeks.
2106 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
2108 drive = tape->drive;
2110 filp->private_data = tape;
2112 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
2117 retval = idetape_wait_ready(drive, 60 * HZ);
2119 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2120 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
2124 idetape_read_position(drive);
2125 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
2126 (void)idetape_rewind_tape(drive);
2128 /* Read block size and write protect status from drive. */
2129 ide_tape_get_bsize_from_bdesc(drive);
2131 /* Set write protect flag if device is opened as read-only. */
2132 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
2133 tape->write_prot = 1;
2135 tape->write_prot = tape->drv_write_prot;
2137 /* Make sure drive isn't write protected if user wants to write. */
2138 if (tape->write_prot) {
2139 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
2140 (filp->f_flags & O_ACCMODE) == O_RDWR) {
2141 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2147 /* Lock the tape drive door so user can't eject. */
2148 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2149 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
2150 if (!idetape_queue_pc_tail(drive, &pc)) {
2151 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
2152 tape->door_locked = DOOR_LOCKED;
2165 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
2167 idetape_tape_t *tape = drive->driver_data;
2169 ide_tape_flush_merge_buffer(drive);
2170 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
2171 if (tape->merge_bh != NULL) {
2172 idetape_pad_zeros(drive, tape->blk_size *
2173 (tape->user_bs_factor - 1));
2174 ide_tape_kfree_buffer(tape);
2175 tape->merge_bh = NULL;
2177 idetape_write_filemark(drive);
2178 idetape_flush_tape_buffers(drive);
2179 idetape_flush_tape_buffers(drive);
2182 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
2184 struct ide_tape_obj *tape = ide_tape_f(filp);
2185 ide_drive_t *drive = tape->drive;
2186 struct ide_atapi_pc pc;
2187 unsigned int minor = iminor(inode);
2190 tape = drive->driver_data;
2192 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2194 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2195 idetape_write_release(drive, minor);
2196 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2198 ide_tape_discard_merge_buffer(drive, 1);
2201 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
2202 (void) idetape_rewind_tape(drive);
2203 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2204 if (tape->door_locked == DOOR_LOCKED) {
2205 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
2206 if (!idetape_queue_pc_tail(drive, &pc))
2207 tape->door_locked = DOOR_UNLOCKED;
2211 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2217 static void idetape_get_inquiry_results(ide_drive_t *drive)
2219 idetape_tape_t *tape = drive->driver_data;
2220 struct ide_atapi_pc pc;
2221 char fw_rev[4], vendor_id[8], product_id[16];
2223 idetape_create_inquiry_cmd(&pc);
2224 if (idetape_queue_pc_tail(drive, &pc)) {
2225 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2229 memcpy(vendor_id, &pc.buf[8], 8);
2230 memcpy(product_id, &pc.buf[16], 16);
2231 memcpy(fw_rev, &pc.buf[32], 4);
2233 ide_fixstring(vendor_id, 8, 0);
2234 ide_fixstring(product_id, 16, 0);
2235 ide_fixstring(fw_rev, 4, 0);
2237 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2238 drive->name, tape->name, vendor_id, product_id, fw_rev);
2242 * Ask the tape about its various parameters. In particular, we will adjust our
2243 * data transfer buffer size to the recommended value as returned by the tape.
2245 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2247 idetape_tape_t *tape = drive->driver_data;
2248 struct ide_atapi_pc pc;
2250 u8 speed, max_speed;
2252 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2253 if (idetape_queue_pc_tail(drive, &pc)) {
2254 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2255 " some default values\n");
2256 tape->blk_size = 512;
2257 put_unaligned(52, (u16 *)&tape->caps[12]);
2258 put_unaligned(540, (u16 *)&tape->caps[14]);
2259 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2262 caps = pc.buf + 4 + pc.buf[3];
2264 /* convert to host order and save for later use */
2265 speed = be16_to_cpup((__be16 *)&caps[14]);
2266 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2268 *(u16 *)&caps[8] = max_speed;
2269 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2270 *(u16 *)&caps[14] = speed;
2271 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2274 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2275 "(assuming 650KB/sec)\n", drive->name);
2276 *(u16 *)&caps[14] = 650;
2279 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2280 "(assuming 650KB/sec)\n", drive->name);
2281 *(u16 *)&caps[8] = 650;
2284 memcpy(&tape->caps, caps, 20);
2286 tape->blk_size = 512;
2287 else if (caps[7] & 0x04)
2288 tape->blk_size = 1024;
2291 #ifdef CONFIG_IDE_PROC_FS
2292 #define ide_tape_devset_get(name, field) \
2293 static int get_##name(ide_drive_t *drive) \
2295 idetape_tape_t *tape = drive->driver_data; \
2296 return tape->field; \
2299 #define ide_tape_devset_set(name, field) \
2300 static int set_##name(ide_drive_t *drive, int arg) \
2302 idetape_tape_t *tape = drive->driver_data; \
2303 tape->field = arg; \
2307 #define ide_tape_devset_rw(_name, _min, _max, _field, _mulf, _divf) \
2308 ide_tape_devset_get(_name, _field) \
2309 ide_tape_devset_set(_name, _field) \
2310 __IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name, _mulf, _divf)
2312 #define ide_tape_devset_r(_name, _min, _max, _field, _mulf, _divf) \
2313 ide_tape_devset_get(_name, _field) \
2314 __IDE_DEVSET(_name, S_READ, _min, _max, get_##_name, NULL, _mulf, _divf)
2316 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2317 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2318 static int divf_buffer(ide_drive_t *drive) { return 2; }
2319 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2321 ide_devset_rw(dsc_overlap, 0, 1, dsc_overlap);
2323 ide_tape_devset_rw(debug_mask, 0, 0xffff, debug_mask, NULL, NULL);
2324 ide_tape_devset_rw(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2325 best_dsc_rw_freq, mulf_tdsc, divf_tdsc);
2327 ide_tape_devset_r(avg_speed, 0, 0xffff, avg_speed, NULL, NULL);
2328 ide_tape_devset_r(speed, 0, 0xffff, caps[14], NULL, NULL);
2329 ide_tape_devset_r(buffer, 0, 0xffff, caps[16], NULL, divf_buffer);
2330 ide_tape_devset_r(buffer_size, 0, 0xffff, buffer_size, NULL, divf_buffer_size);
2332 static const struct ide_devset *idetape_settings[] = {
2333 &ide_devset_avg_speed,
2335 &ide_devset_buffer_size,
2336 &ide_devset_debug_mask,
2337 &ide_devset_dsc_overlap,
2345 * The function below is called to:
2347 * 1. Initialize our various state variables.
2348 * 2. Ask the tape for its capabilities.
2349 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2350 * is chosen based on the recommendation which we received in step 2.
2352 * Note that at this point ide.c already assigned us an irq, so that we can
2353 * queue requests here and wait for their completion.
2355 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2361 u16 *ctl = (u16 *)&tape->caps[12];
2363 drive->pc_callback = ide_tape_callback;
2365 spin_lock_init(&tape->lock);
2366 drive->dsc_overlap = 1;
2367 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2368 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2370 drive->dsc_overlap = 0;
2372 /* Seagate Travan drives do not support DSC overlap. */
2373 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2374 drive->dsc_overlap = 0;
2375 tape->minor = minor;
2376 tape->name[0] = 'h';
2377 tape->name[1] = 't';
2378 tape->name[2] = '0' + minor;
2379 tape->chrdev_dir = IDETAPE_DIR_NONE;
2381 *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];
2383 /* Command packet DRQ type */
2384 if (((gcw[0] & 0x60) >> 5) == 1)
2385 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
2387 idetape_get_inquiry_results(drive);
2388 idetape_get_mode_sense_results(drive);
2389 ide_tape_get_bsize_from_bdesc(drive);
2390 tape->user_bs_factor = 1;
2391 tape->buffer_size = *ctl * tape->blk_size;
2392 while (tape->buffer_size > 0xffff) {
2393 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2395 tape->buffer_size = *ctl * tape->blk_size;
2397 buffer_size = tape->buffer_size;
2398 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2399 if (buffer_size % PAGE_SIZE) {
2400 tape->pages_per_buffer++;
2401 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2404 /* select the "best" DSC read/write polling freq */
2405 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2407 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2410 * Ensure that the number we got makes sense; limit it within
2411 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2413 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2414 IDETAPE_DSC_RW_MAX);
2415 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2417 drive->name, tape->name, *(u16 *)&tape->caps[14],
2418 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2419 tape->buffer_size / 1024,
2420 tape->best_dsc_rw_freq * 1000 / HZ,
2421 drive->using_dma ? ", DMA":"");
2423 ide_proc_register_driver(drive, tape->driver);
2426 static void ide_tape_remove(ide_drive_t *drive)
2428 idetape_tape_t *tape = drive->driver_data;
2430 ide_proc_unregister_driver(drive, tape->driver);
2432 ide_unregister_region(tape->disk);
2437 static void ide_tape_release(struct kref *kref)
2439 struct ide_tape_obj *tape = to_ide_tape(kref);
2440 ide_drive_t *drive = tape->drive;
2441 struct gendisk *g = tape->disk;
2443 BUG_ON(tape->merge_bh_size);
2445 drive->dsc_overlap = 0;
2446 drive->driver_data = NULL;
2447 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2448 device_destroy(idetape_sysfs_class,
2449 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2450 idetape_devs[tape->minor] = NULL;
2451 g->private_data = NULL;
2456 #ifdef CONFIG_IDE_PROC_FS
2457 static int proc_idetape_read_name
2458 (char *page, char **start, off_t off, int count, int *eof, void *data)
2460 ide_drive_t *drive = (ide_drive_t *) data;
2461 idetape_tape_t *tape = drive->driver_data;
2465 len = sprintf(out, "%s\n", tape->name);
2466 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2469 static ide_proc_entry_t idetape_proc[] = {
2470 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2471 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2472 { NULL, 0, NULL, NULL }
2476 static int ide_tape_probe(ide_drive_t *);
2478 static ide_driver_t idetape_driver = {
2480 .owner = THIS_MODULE,
2482 .bus = &ide_bus_type,
2484 .probe = ide_tape_probe,
2485 .remove = ide_tape_remove,
2486 .version = IDETAPE_VERSION,
2488 .do_request = idetape_do_request,
2489 .end_request = idetape_end_request,
2490 .error = __ide_error,
2491 #ifdef CONFIG_IDE_PROC_FS
2492 .proc = idetape_proc,
2493 .settings = idetape_settings,
2497 /* Our character device supporting functions, passed to register_chrdev. */
2498 static const struct file_operations idetape_fops = {
2499 .owner = THIS_MODULE,
2500 .read = idetape_chrdev_read,
2501 .write = idetape_chrdev_write,
2502 .ioctl = idetape_chrdev_ioctl,
2503 .open = idetape_chrdev_open,
2504 .release = idetape_chrdev_release,
2507 static int idetape_open(struct inode *inode, struct file *filp)
2509 struct gendisk *disk = inode->i_bdev->bd_disk;
2510 struct ide_tape_obj *tape;
2512 tape = ide_tape_get(disk);
2519 static int idetape_release(struct inode *inode, struct file *filp)
2521 struct gendisk *disk = inode->i_bdev->bd_disk;
2522 struct ide_tape_obj *tape = ide_tape_g(disk);
2529 static int idetape_ioctl(struct inode *inode, struct file *file,
2530 unsigned int cmd, unsigned long arg)
2532 struct block_device *bdev = inode->i_bdev;
2533 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
2534 ide_drive_t *drive = tape->drive;
2535 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2537 err = idetape_blkdev_ioctl(drive, cmd, arg);
2541 static struct block_device_operations idetape_block_ops = {
2542 .owner = THIS_MODULE,
2543 .open = idetape_open,
2544 .release = idetape_release,
2545 .ioctl = idetape_ioctl,
2548 static int ide_tape_probe(ide_drive_t *drive)
2550 idetape_tape_t *tape;
2554 if (!strstr("ide-tape", drive->driver_req))
2557 if (drive->media != ide_tape)
2560 if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) {
2561 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2562 " the driver\n", drive->name);
2565 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2567 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2572 g = alloc_disk(1 << PARTN_BITS);
2576 ide_init_disk(g, drive);
2578 kref_init(&tape->kref);
2580 tape->drive = drive;
2581 tape->driver = &idetape_driver;
2584 g->private_data = &tape->driver;
2586 drive->driver_data = tape;
2588 mutex_lock(&idetape_ref_mutex);
2589 for (minor = 0; idetape_devs[minor]; minor++)
2591 idetape_devs[minor] = tape;
2592 mutex_unlock(&idetape_ref_mutex);
2594 idetape_setup(drive, tape, minor);
2596 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2597 MKDEV(IDETAPE_MAJOR, minor), NULL,
2599 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2600 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2603 g->fops = &idetape_block_ops;
2604 ide_register_region(g);
2614 static void __exit idetape_exit(void)
2616 driver_unregister(&idetape_driver.gen_driver);
2617 class_destroy(idetape_sysfs_class);
2618 unregister_chrdev(IDETAPE_MAJOR, "ht");
2621 static int __init idetape_init(void)
2624 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2625 if (IS_ERR(idetape_sysfs_class)) {
2626 idetape_sysfs_class = NULL;
2627 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2632 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2633 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2636 goto out_free_class;
2639 error = driver_register(&idetape_driver.gen_driver);
2641 goto out_free_driver;
2646 driver_unregister(&idetape_driver.gen_driver);
2648 class_destroy(idetape_sysfs_class);
2653 MODULE_ALIAS("ide:*m-tape*");
2654 module_init(idetape_init);
2655 module_exit(idetape_exit);
2656 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2657 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2658 MODULE_LICENSE("GPL");