2 * IDE ATAPI streaming tape driver.
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
18 #define DRV_NAME "ide-tape"
20 #define IDETAPE_VERSION "1.20"
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/string.h>
25 #include <linux/kernel.h>
26 #include <linux/delay.h>
27 #include <linux/timer.h>
29 #include <linux/interrupt.h>
30 #include <linux/jiffies.h>
31 #include <linux/major.h>
32 #include <linux/errno.h>
33 #include <linux/genhd.h>
34 #include <linux/slab.h>
35 #include <linux/pci.h>
36 #include <linux/ide.h>
37 #include <linux/smp_lock.h>
38 #include <linux/completion.h>
39 #include <linux/bitops.h>
40 #include <linux/mutex.h>
41 #include <scsi/scsi.h>
43 #include <asm/byteorder.h>
44 #include <linux/irq.h>
45 #include <linux/uaccess.h>
47 #include <asm/unaligned.h>
48 #include <linux/mtio.h>
51 /* output errors only */
53 /* output all sense key/asc */
55 /* info regarding all chrdev-related procedures */
56 DBG_CHRDEV = (1 << 2),
57 /* all remaining procedures */
61 /* define to see debug info */
62 #define IDETAPE_DEBUG_LOG 0
65 #define debug_log(lvl, fmt, args...) \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
71 #define debug_log(lvl, fmt, args...) do {} while (0)
74 /**************************** Tunable parameters *****************************/
76 * After each failed packet command we issue a request sense command and retry
77 * the packet command IDETAPE_MAX_PC_RETRIES times.
79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
81 #define IDETAPE_MAX_PC_RETRIES 3
84 * The following parameter is used to select the point in the internal tape fifo
85 * in which we will start to refill the buffer. Decreasing the following
86 * parameter will improve the system's latency and interactive response, while
87 * using a high value might improve system throughput.
89 #define IDETAPE_FIFO_THRESHOLD 2
92 * DSC polling parameters.
94 * Polling for DSC (a single bit in the status register) is a very important
95 * function in ide-tape. There are two cases in which we poll for DSC:
97 * 1. Before a read/write packet command, to ensure that we can transfer data
98 * from/to the tape's data buffers, without causing an actual media access.
99 * In case the tape is not ready yet, we take out our request from the device
100 * request queue, so that ide.c could service requests from the other device
101 * on the same interface in the meantime.
103 * 2. After the successful initialization of a "media access packet command",
104 * which is a command that can take a long time to complete (the interval can
105 * range from several seconds to even an hour). Again, we postpone our request
106 * in the middle to free the bus for the other device. The polling frequency
107 * here should be lower than the read/write frequency since those media access
108 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
109 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
110 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
112 * We also set a timeout for the timer, in case something goes wrong. The
113 * timeout should be longer then the maximum execution time of a tape operation.
117 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
118 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
119 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
120 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
121 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
122 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
123 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
125 /*************************** End of tunable parameters ***********************/
127 /* tape directions */
129 IDETAPE_DIR_NONE = (1 << 0),
130 IDETAPE_DIR_READ = (1 << 1),
131 IDETAPE_DIR_WRITE = (1 << 2),
134 /* Tape door status */
135 #define DOOR_UNLOCKED 0
136 #define DOOR_LOCKED 1
137 #define DOOR_EXPLICITLY_LOCKED 2
139 /* Some defines for the SPACE command */
140 #define IDETAPE_SPACE_OVER_FILEMARK 1
141 #define IDETAPE_SPACE_TO_EOD 3
143 /* Some defines for the LOAD UNLOAD command */
144 #define IDETAPE_LU_LOAD_MASK 1
145 #define IDETAPE_LU_RETENSION_MASK 2
146 #define IDETAPE_LU_EOT_MASK 4
148 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
149 #define IDETAPE_BLOCK_DESCRIPTOR 0
150 #define IDETAPE_CAPABILITIES_PAGE 0x2a
153 * Most of our global data which we need to save even as we leave the driver due
154 * to an interrupt or a timer event is stored in the struct defined below.
156 typedef struct ide_tape_obj {
158 struct ide_driver *driver;
159 struct gendisk *disk;
162 /* used by REQ_IDETAPE_{READ,WRITE} requests */
163 struct ide_atapi_pc queued_pc;
166 * DSC polling variables.
168 * While polling for DSC we use postponed_rq to postpone the current
169 * request so that ide.c will be able to service pending requests on the
170 * other device. Note that at most we will have only one DSC (usually
171 * data transfer) request in the device request queue.
173 struct request *postponed_rq;
174 /* The time in which we started polling for DSC */
175 unsigned long dsc_polling_start;
176 /* Timer used to poll for dsc */
177 struct timer_list dsc_timer;
178 /* Read/Write dsc polling frequency */
179 unsigned long best_dsc_rw_freq;
180 unsigned long dsc_poll_freq;
181 unsigned long dsc_timeout;
183 /* Read position information */
186 unsigned int first_frame;
188 /* Last error information */
189 u8 sense_key, asc, ascq;
191 /* Character device operation */
195 /* Current character device data transfer direction */
198 /* tape block size, usually 512 or 1024 bytes */
199 unsigned short blk_size;
202 /* Copy of the tape's Capabilities and Mechanical Page */
206 * Active data transfer request parameters.
208 * At most, there is only one ide-tape originated data transfer request
209 * in the device request queue. This allows ide.c to easily service
210 * requests from the other device when we postpone our active request.
213 /* Data buffer size chosen based on the tape's recommendation */
215 /* Staging buffer of buffer_size bytes */
217 /* The read/write cursor */
219 /* The number of valid bytes in buf */
222 /* Measures average tape speed */
223 unsigned long avg_time;
227 /* the door is currently locked */
229 /* the tape hardware is write protected */
231 /* the tape is write protected (hardware or opened as read-only) */
237 static DEFINE_MUTEX(idetape_ref_mutex);
239 static struct class *idetape_sysfs_class;
241 static void ide_tape_release(struct device *);
243 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
245 struct ide_tape_obj *tape = NULL;
247 mutex_lock(&idetape_ref_mutex);
248 tape = ide_drv_g(disk, ide_tape_obj);
250 if (ide_device_get(tape->drive))
253 get_device(&tape->dev);
255 mutex_unlock(&idetape_ref_mutex);
259 static void ide_tape_put(struct ide_tape_obj *tape)
261 ide_drive_t *drive = tape->drive;
263 mutex_lock(&idetape_ref_mutex);
264 put_device(&tape->dev);
265 ide_device_put(drive);
266 mutex_unlock(&idetape_ref_mutex);
270 * The variables below are used for the character device interface. Additional
271 * state variables are defined in our ide_drive_t structure.
273 static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
275 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
277 struct ide_tape_obj *tape = NULL;
279 mutex_lock(&idetape_ref_mutex);
280 tape = idetape_devs[i];
282 get_device(&tape->dev);
283 mutex_unlock(&idetape_ref_mutex);
288 * called on each failed packet command retry to analyze the request sense. We
289 * currently do not utilize this information.
291 static void idetape_analyze_error(ide_drive_t *drive)
293 idetape_tape_t *tape = drive->driver_data;
294 struct ide_atapi_pc *pc = drive->failed_pc;
295 struct request *rq = drive->hwif->rq;
296 u8 *sense = bio_data(rq->bio);
298 tape->sense_key = sense[2] & 0xF;
299 tape->asc = sense[12];
300 tape->ascq = sense[13];
302 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
303 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
305 /* correct remaining bytes to transfer */
306 if (pc->flags & PC_FLAG_DMA_ERROR)
307 rq->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]);
310 * If error was the result of a zero-length read or write command,
311 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
312 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
314 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
316 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
317 if (tape->sense_key == 5) {
318 /* don't report an error, everything's ok */
320 /* don't retry read/write */
321 pc->flags |= PC_FLAG_ABORT;
324 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
325 pc->error = IDE_DRV_ERROR_FILEMARK;
326 pc->flags |= PC_FLAG_ABORT;
328 if (pc->c[0] == WRITE_6) {
329 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
330 && tape->asc == 0x0 && tape->ascq == 0x2)) {
331 pc->error = IDE_DRV_ERROR_EOD;
332 pc->flags |= PC_FLAG_ABORT;
335 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
336 if (tape->sense_key == 8) {
337 pc->error = IDE_DRV_ERROR_EOD;
338 pc->flags |= PC_FLAG_ABORT;
340 if (!(pc->flags & PC_FLAG_ABORT) &&
341 (blk_rq_bytes(rq) - rq->resid_len))
342 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
346 static void ide_tape_handle_dsc(ide_drive_t *);
348 static int ide_tape_callback(ide_drive_t *drive, int dsc)
350 idetape_tape_t *tape = drive->driver_data;
351 struct ide_atapi_pc *pc = drive->pc;
352 struct request *rq = drive->hwif->rq;
353 int uptodate = pc->error ? 0 : 1;
354 int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
356 debug_log(DBG_PROCS, "Enter %s\n", __func__);
359 ide_tape_handle_dsc(drive);
361 if (drive->failed_pc == pc)
362 drive->failed_pc = NULL;
364 if (pc->c[0] == REQUEST_SENSE) {
366 idetape_analyze_error(drive);
368 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
369 "itself - Aborting request!\n");
370 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
371 unsigned int blocks =
372 (blk_rq_bytes(rq) - rq->resid_len) / tape->blk_size;
374 tape->avg_size += blocks * tape->blk_size;
376 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
377 tape->avg_speed = tape->avg_size * HZ /
378 (jiffies - tape->avg_time) / 1024;
380 tape->avg_time = jiffies;
383 tape->first_frame += blocks;
389 } else if (pc->c[0] == READ_POSITION && uptodate) {
390 u8 *readpos = pc->buf;
392 debug_log(DBG_SENSE, "BOP - %s\n",
393 (readpos[0] & 0x80) ? "Yes" : "No");
394 debug_log(DBG_SENSE, "EOP - %s\n",
395 (readpos[0] & 0x40) ? "Yes" : "No");
397 if (readpos[0] & 0x4) {
398 printk(KERN_INFO "ide-tape: Block location is unknown"
400 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
402 err = IDE_DRV_ERROR_GENERAL;
404 debug_log(DBG_SENSE, "Block Location - %u\n",
405 be32_to_cpup((__be32 *)&readpos[4]));
407 tape->partition = readpos[1];
408 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
409 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
419 * Postpone the current request so that ide.c will be able to service requests
420 * from another device on the same port while we are polling for DSC.
422 static void idetape_postpone_request(ide_drive_t *drive)
424 idetape_tape_t *tape = drive->driver_data;
426 debug_log(DBG_PROCS, "Enter %s\n", __func__);
428 tape->postponed_rq = drive->hwif->rq;
430 ide_stall_queue(drive, tape->dsc_poll_freq);
433 static void ide_tape_handle_dsc(ide_drive_t *drive)
435 idetape_tape_t *tape = drive->driver_data;
437 /* Media access command */
438 tape->dsc_polling_start = jiffies;
439 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
440 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
441 /* Allow ide.c to handle other requests */
442 idetape_postpone_request(drive);
446 * Packet Command Interface
448 * The current Packet Command is available in drive->pc, and will not change
449 * until we finish handling it. Each packet command is associated with a
450 * callback function that will be called when the command is finished.
452 * The handling will be done in three stages:
454 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set
455 * the interrupt handler to ide_pc_intr.
457 * 2. On each interrupt, ide_pc_intr will be called. This step will be
458 * repeated until the device signals us that no more interrupts will be issued.
460 * 3. ATAPI Tape media access commands have immediate status with a delayed
461 * process. In case of a successful initiation of a media access packet command,
462 * the DSC bit will be set when the actual execution of the command is finished.
463 * Since the tape drive will not issue an interrupt, we have to poll for this
464 * event. In this case, we define the request as "low priority request" by
465 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
468 * ide.c will then give higher priority to requests which originate from the
469 * other device, until will change rq_status to RQ_ACTIVE.
471 * 4. When the packet command is finished, it will be checked for errors.
473 * 5. In case an error was found, we queue a request sense packet command in
474 * front of the request queue and retry the operation up to
475 * IDETAPE_MAX_PC_RETRIES times.
477 * 6. In case no error was found, or we decided to give up and not to retry
478 * again, the callback function will be called and then we will handle the next
482 static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
484 struct ide_atapi_pc *pc)
486 idetape_tape_t *tape = drive->driver_data;
487 struct request *rq = drive->hwif->rq;
489 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
490 drive->failed_pc = pc;
492 /* Set the current packet command */
495 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
496 (pc->flags & PC_FLAG_ABORT)) {
499 * We will "abort" retrying a packet command in case legitimate
500 * error code was received (crossing a filemark, or end of the
501 * media, for example).
503 if (!(pc->flags & PC_FLAG_ABORT)) {
504 if (!(pc->c[0] == TEST_UNIT_READY &&
505 tape->sense_key == 2 && tape->asc == 4 &&
506 (tape->ascq == 1 || tape->ascq == 8))) {
507 printk(KERN_ERR "ide-tape: %s: I/O error, "
508 "pc = %2x, key = %2x, "
509 "asc = %2x, ascq = %2x\n",
510 tape->name, pc->c[0],
511 tape->sense_key, tape->asc,
515 pc->error = IDE_DRV_ERROR_GENERAL;
518 drive->failed_pc = NULL;
519 drive->pc_callback(drive, 0);
520 ide_complete_rq(drive, -EIO, blk_rq_bytes(rq));
523 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
527 return ide_issue_pc(drive, cmd);
530 /* A mode sense command is used to "sense" tape parameters. */
531 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
534 pc->c[0] = MODE_SENSE;
535 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
536 /* DBD = 1 - Don't return block descriptors */
538 pc->c[2] = page_code;
540 * Changed pc->c[3] to 0 (255 will at best return unused info).
542 * For SCSI this byte is defined as subpage instead of high byte
543 * of length and some IDE drives seem to interpret it this way
544 * and return an error when 255 is used.
547 /* We will just discard data in that case */
549 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
551 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
557 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
559 ide_hwif_t *hwif = drive->hwif;
560 idetape_tape_t *tape = drive->driver_data;
561 struct ide_atapi_pc *pc = drive->pc;
564 stat = hwif->tp_ops->read_status(hwif);
566 if (stat & ATA_DSC) {
567 if (stat & ATA_ERR) {
569 if (pc->c[0] != TEST_UNIT_READY)
570 printk(KERN_ERR "ide-tape: %s: I/O error, ",
572 /* Retry operation */
578 pc->error = IDE_DRV_ERROR_GENERAL;
579 drive->failed_pc = NULL;
581 drive->pc_callback(drive, 0);
585 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
586 struct ide_atapi_pc *pc, struct request *rq,
589 unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9);
592 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
595 pc->buf_size = blk_rq_bytes(rq);
596 if (pc->buf_size == tape->buffer_size)
597 pc->flags |= PC_FLAG_DMA_OK;
599 if (opcode == READ_6)
601 else if (opcode == WRITE_6) {
603 pc->flags |= PC_FLAG_WRITING;
606 memcpy(rq->cmd, pc->c, 12);
609 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
610 struct request *rq, sector_t block)
612 ide_hwif_t *hwif = drive->hwif;
613 idetape_tape_t *tape = drive->driver_data;
614 struct ide_atapi_pc *pc = NULL;
615 struct request *postponed_rq = tape->postponed_rq;
619 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %u\n"
620 (unsigned long long)blk_rq_pos(rq), blk_rq_sectors(rq));
622 if (!(blk_special_request(rq) || blk_sense_request(rq))) {
623 /* We do not support buffer cache originated requests. */
624 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
625 "request queue (%d)\n", drive->name, rq->cmd_type);
626 if (blk_fs_request(rq) == 0 && rq->errors == 0)
628 ide_complete_rq(drive, -EIO, ide_rq_bytes(rq));
632 /* Retry a failed packet command */
633 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
634 pc = drive->failed_pc;
638 if (postponed_rq != NULL)
639 if (rq != postponed_rq) {
640 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
641 "Two DSC requests were queued\n");
642 drive->failed_pc = NULL;
644 ide_complete_rq(drive, 0, blk_rq_bytes(rq));
648 tape->postponed_rq = NULL;
651 * If the tape is still busy, postpone our request and service
652 * the other device meanwhile.
654 stat = hwif->tp_ops->read_status(hwif);
656 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 &&
657 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0)
658 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
660 if (drive->dev_flags & IDE_DFLAG_POST_RESET) {
661 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
662 drive->dev_flags &= ~IDE_DFLAG_POST_RESET;
665 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
666 (stat & ATA_DSC) == 0) {
667 if (postponed_rq == NULL) {
668 tape->dsc_polling_start = jiffies;
669 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
670 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
671 } else if (time_after(jiffies, tape->dsc_timeout)) {
672 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
674 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
675 idetape_media_access_finished(drive);
678 return ide_do_reset(drive);
680 } else if (time_after(jiffies,
681 tape->dsc_polling_start +
682 IDETAPE_DSC_MA_THRESHOLD))
683 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
684 idetape_postpone_request(drive);
687 if (rq->cmd[13] & REQ_IDETAPE_READ) {
688 pc = &tape->queued_pc;
689 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
692 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
693 pc = &tape->queued_pc;
694 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
697 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
698 pc = (struct ide_atapi_pc *)rq->special;
699 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
700 rq->cmd[13] |= REQ_IDETAPE_PC2;
703 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
704 idetape_media_access_finished(drive);
710 /* prepare sense request for this command */
711 ide_prep_sense(drive, rq);
713 memset(&cmd, 0, sizeof(cmd));
716 cmd.tf_flags |= IDE_TFLAG_WRITE;
720 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
721 ide_map_sg(drive, &cmd);
723 return ide_tape_issue_pc(drive, &cmd, pc);
727 * Write a filemark if write_filemark=1. Flush the device buffers without
728 * writing a filemark otherwise.
730 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
731 struct ide_atapi_pc *pc, int write_filemark)
734 pc->c[0] = WRITE_FILEMARKS;
735 pc->c[4] = write_filemark;
736 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
739 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
741 idetape_tape_t *tape = drive->driver_data;
742 struct gendisk *disk = tape->disk;
743 int load_attempted = 0;
745 /* Wait for the tape to become ready */
746 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
748 while (time_before(jiffies, timeout)) {
749 if (ide_do_test_unit_ready(drive, disk) == 0)
751 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
752 || (tape->asc == 0x3A)) {
756 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
758 /* not about to be ready */
759 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
760 (tape->ascq == 1 || tape->ascq == 8)))
767 static int idetape_flush_tape_buffers(ide_drive_t *drive)
769 struct ide_tape_obj *tape = drive->driver_data;
770 struct ide_atapi_pc pc;
773 idetape_create_write_filemark_cmd(drive, &pc, 0);
774 rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0);
777 idetape_wait_ready(drive, 60 * 5 * HZ);
781 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
784 pc->c[0] = READ_POSITION;
788 static int idetape_read_position(ide_drive_t *drive)
790 idetape_tape_t *tape = drive->driver_data;
791 struct ide_atapi_pc pc;
794 debug_log(DBG_PROCS, "Enter %s\n", __func__);
796 idetape_create_read_position_cmd(&pc);
797 if (ide_queue_pc_tail(drive, tape->disk, &pc, pc.buf, pc.req_xfer))
799 position = tape->first_frame;
803 static void idetape_create_locate_cmd(ide_drive_t *drive,
804 struct ide_atapi_pc *pc,
805 unsigned int block, u8 partition, int skip)
808 pc->c[0] = POSITION_TO_ELEMENT;
810 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
811 pc->c[8] = partition;
812 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
815 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
817 idetape_tape_t *tape = drive->driver_data;
819 if (tape->chrdev_dir != IDETAPE_DIR_READ)
822 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
824 if (tape->buf != NULL) {
829 tape->chrdev_dir = IDETAPE_DIR_NONE;
833 * Position the tape to the requested block using the LOCATE packet command.
834 * A READ POSITION command is then issued to check where we are positioned. Like
835 * all higher level operations, we queue the commands at the tail of the request
836 * queue and wait for their completion.
838 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
839 u8 partition, int skip)
841 idetape_tape_t *tape = drive->driver_data;
842 struct gendisk *disk = tape->disk;
844 struct ide_atapi_pc pc;
846 if (tape->chrdev_dir == IDETAPE_DIR_READ)
847 __ide_tape_discard_merge_buffer(drive);
848 idetape_wait_ready(drive, 60 * 5 * HZ);
849 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
850 retval = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
854 idetape_create_read_position_cmd(&pc);
855 return ide_queue_pc_tail(drive, disk, &pc, pc.buf, pc.req_xfer);
858 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
859 int restore_position)
861 idetape_tape_t *tape = drive->driver_data;
864 __ide_tape_discard_merge_buffer(drive);
865 if (restore_position) {
866 position = idetape_read_position(drive);
867 seek = position > 0 ? position : 0;
868 if (idetape_position_tape(drive, seek, 0, 0)) {
869 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
870 " %s\n", tape->name, __func__);
877 * Generate a read/write request for the block device interface and wait for it
880 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size)
882 idetape_tape_t *tape = drive->driver_data;
886 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
887 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE);
888 BUG_ON(size < 0 || size % tape->blk_size);
890 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
891 rq->cmd_type = REQ_TYPE_SPECIAL;
893 rq->rq_disk = tape->disk;
896 ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size,
902 blk_execute_rq(drive->queue, tape->disk, rq, 0);
904 /* calculate the number of transferred bytes and update buffer state */
905 size -= rq->resid_len;
906 tape->cur = tape->buf;
907 if (cmd == REQ_IDETAPE_READ)
913 if (rq->errors == IDE_DRV_ERROR_GENERAL)
920 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
928 static void idetape_create_rewind_cmd(ide_drive_t *drive,
929 struct ide_atapi_pc *pc)
932 pc->c[0] = REZERO_UNIT;
933 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
936 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
941 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
944 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
948 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
950 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
953 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
955 idetape_tape_t *tape = drive->driver_data;
957 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
958 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
959 " but we are not writing.\n");
963 size_t aligned = roundup(tape->valid, tape->blk_size);
965 memset(tape->cur, 0, aligned - tape->valid);
966 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned);
970 tape->chrdev_dir = IDETAPE_DIR_NONE;
973 static int idetape_init_rw(ide_drive_t *drive, int dir)
975 idetape_tape_t *tape = drive->driver_data;
978 BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE);
980 if (tape->chrdev_dir == dir)
983 if (tape->chrdev_dir == IDETAPE_DIR_READ)
984 ide_tape_discard_merge_buffer(drive, 1);
985 else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
986 ide_tape_flush_merge_buffer(drive);
987 idetape_flush_tape_buffers(drive);
990 if (tape->buf || tape->valid) {
991 printk(KERN_ERR "ide-tape: valid should be 0 now\n");
995 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
998 tape->chrdev_dir = dir;
999 tape->cur = tape->buf;
1002 * Issue a 0 rw command to ensure that DSC handshake is
1003 * switched from completion mode to buffer available mode. No
1004 * point in issuing this if DSC overlap isn't supported, some
1005 * drives (Seagate STT3401A) will return an error.
1007 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
1008 int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ
1009 : REQ_IDETAPE_WRITE;
1011 rc = idetape_queue_rw_tail(drive, cmd, 0);
1015 tape->chrdev_dir = IDETAPE_DIR_NONE;
1023 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1025 idetape_tape_t *tape = drive->driver_data;
1027 memset(tape->buf, 0, tape->buffer_size);
1030 unsigned int count = min(tape->buffer_size, bcount);
1032 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count);
1038 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1039 * currently support only one partition.
1041 static int idetape_rewind_tape(ide_drive_t *drive)
1043 struct ide_tape_obj *tape = drive->driver_data;
1044 struct gendisk *disk = tape->disk;
1046 struct ide_atapi_pc pc;
1048 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1050 idetape_create_rewind_cmd(drive, &pc);
1051 retval = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1055 idetape_create_read_position_cmd(&pc);
1056 retval = ide_queue_pc_tail(drive, disk, &pc, pc.buf, pc.req_xfer);
1062 /* mtio.h compatible commands should be issued to the chrdev interface. */
1063 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1066 idetape_tape_t *tape = drive->driver_data;
1067 void __user *argp = (void __user *)arg;
1069 struct idetape_config {
1070 int dsc_rw_frequency;
1071 int dsc_media_access_frequency;
1075 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1079 if (copy_from_user(&config, argp, sizeof(config)))
1081 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1084 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1085 config.nr_stages = 1;
1086 if (copy_to_user(argp, &config, sizeof(config)))
1095 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1098 idetape_tape_t *tape = drive->driver_data;
1099 struct gendisk *disk = tape->disk;
1100 struct ide_atapi_pc pc;
1101 int retval, count = 0;
1102 int sprev = !!(tape->caps[4] & 0x20);
1106 if (MTBSF == mt_op || MTBSFM == mt_op) {
1109 mt_count = -mt_count;
1112 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1114 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1116 ide_tape_discard_merge_buffer(drive, 0);
1122 idetape_create_space_cmd(&pc, mt_count - count,
1123 IDETAPE_SPACE_OVER_FILEMARK);
1124 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1129 retval = idetape_space_over_filemarks(drive, MTFSF,
1133 count = (MTBSFM == mt_op ? 1 : -1);
1134 return idetape_space_over_filemarks(drive, MTFSF, count);
1136 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1143 * Our character device read / write functions.
1145 * The tape is optimized to maximize throughput when it is transferring an
1146 * integral number of the "continuous transfer limit", which is a parameter of
1147 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1149 * As of version 1.3 of the driver, the character device provides an abstract
1150 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1151 * same backup/restore procedure is supported. The driver will internally
1152 * convert the requests to the recommended transfer unit, so that an unmatch
1153 * between the user's block size to the recommended size will only result in a
1154 * (slightly) increased driver overhead, but will no longer hit performance.
1155 * This is not applicable to Onstream.
1157 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1158 size_t count, loff_t *ppos)
1160 struct ide_tape_obj *tape = file->private_data;
1161 ide_drive_t *drive = tape->drive;
1166 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1168 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1169 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1170 if (count > tape->blk_size &&
1171 (count % tape->blk_size) == 0)
1172 tape->user_bs_factor = count / tape->blk_size;
1175 rc = idetape_init_rw(drive, IDETAPE_DIR_READ);
1179 while (done < count) {
1182 /* refill if staging buffer is empty */
1184 /* If we are at a filemark, nothing more to read */
1185 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1188 if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ,
1189 tape->buffer_size) <= 0)
1194 todo = min_t(size_t, count - done, tape->valid);
1195 if (copy_to_user(buf + done, tape->cur, todo))
1199 tape->valid -= todo;
1203 if (!done && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1204 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1206 idetape_space_over_filemarks(drive, MTFSF, 1);
1210 return ret ? ret : done;
1213 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1214 size_t count, loff_t *ppos)
1216 struct ide_tape_obj *tape = file->private_data;
1217 ide_drive_t *drive = tape->drive;
1222 /* The drive is write protected. */
1223 if (tape->write_prot)
1226 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1228 /* Initialize write operation */
1229 rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE);
1233 while (done < count) {
1236 /* flush if staging buffer is full */
1237 if (tape->valid == tape->buffer_size &&
1238 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1239 tape->buffer_size) <= 0)
1243 todo = min_t(size_t, count - done,
1244 tape->buffer_size - tape->valid);
1245 if (copy_from_user(tape->cur, buf + done, todo))
1249 tape->valid += todo;
1253 return ret ? ret : done;
1256 static int idetape_write_filemark(ide_drive_t *drive)
1258 struct ide_tape_obj *tape = drive->driver_data;
1259 struct ide_atapi_pc pc;
1261 /* Write a filemark */
1262 idetape_create_write_filemark_cmd(drive, &pc, 1);
1263 if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) {
1264 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1271 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1274 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1275 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1276 * usually not supported.
1278 * The following commands are currently not supported:
1280 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1281 * MT_ST_WRITE_THRESHOLD.
1283 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1285 idetape_tape_t *tape = drive->driver_data;
1286 struct gendisk *disk = tape->disk;
1287 struct ide_atapi_pc pc;
1290 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1300 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1307 if (tape->write_prot)
1309 ide_tape_discard_merge_buffer(drive, 1);
1310 for (i = 0; i < mt_count; i++) {
1311 retval = idetape_write_filemark(drive);
1317 ide_tape_discard_merge_buffer(drive, 0);
1318 if (idetape_rewind_tape(drive))
1322 ide_tape_discard_merge_buffer(drive, 0);
1323 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1327 * If door is locked, attempt to unlock before
1328 * attempting to eject.
1330 if (tape->door_locked) {
1331 if (!ide_set_media_lock(drive, disk, 0))
1332 tape->door_locked = DOOR_UNLOCKED;
1334 ide_tape_discard_merge_buffer(drive, 0);
1335 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1337 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1340 ide_tape_discard_merge_buffer(drive, 0);
1341 return idetape_flush_tape_buffers(drive);
1343 ide_tape_discard_merge_buffer(drive, 0);
1344 return ide_do_start_stop(drive, disk,
1345 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1347 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1348 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1350 (void)idetape_rewind_tape(drive);
1351 idetape_create_erase_cmd(&pc);
1352 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
1355 if (mt_count < tape->blk_size ||
1356 mt_count % tape->blk_size)
1358 tape->user_bs_factor = mt_count / tape->blk_size;
1359 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1361 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1364 ide_tape_discard_merge_buffer(drive, 0);
1365 return idetape_position_tape(drive,
1366 mt_count * tape->user_bs_factor, tape->partition, 0);
1368 ide_tape_discard_merge_buffer(drive, 0);
1369 return idetape_position_tape(drive, 0, mt_count, 0);
1373 retval = ide_set_media_lock(drive, disk, 1);
1376 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1379 retval = ide_set_media_lock(drive, disk, 0);
1382 tape->door_locked = DOOR_UNLOCKED;
1385 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1392 * Our character device ioctls. General mtio.h magnetic io commands are
1393 * supported here, and not in the corresponding block interface. Our own
1394 * ide-tape ioctls are supported on both interfaces.
1396 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1397 unsigned int cmd, unsigned long arg)
1399 struct ide_tape_obj *tape = file->private_data;
1400 ide_drive_t *drive = tape->drive;
1404 int block_offset = 0, position = tape->first_frame;
1405 void __user *argp = (void __user *)arg;
1407 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1409 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1410 ide_tape_flush_merge_buffer(drive);
1411 idetape_flush_tape_buffers(drive);
1413 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1414 block_offset = tape->valid /
1415 (tape->blk_size * tape->user_bs_factor);
1416 position = idetape_read_position(drive);
1422 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1424 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1426 memset(&mtget, 0, sizeof(struct mtget));
1427 mtget.mt_type = MT_ISSCSI2;
1428 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1430 ((tape->blk_size * tape->user_bs_factor)
1431 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1433 if (tape->drv_write_prot)
1434 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1436 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1440 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1441 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1445 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1446 ide_tape_discard_merge_buffer(drive, 1);
1447 return idetape_blkdev_ioctl(drive, cmd, arg);
1452 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1453 * block size with the reported value.
1455 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1457 idetape_tape_t *tape = drive->driver_data;
1458 struct ide_atapi_pc pc;
1461 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1462 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
1463 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1464 if (tape->blk_size == 0) {
1465 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1466 "block size, assuming 32k\n");
1467 tape->blk_size = 32768;
1471 tape->blk_size = (buf[4 + 5] << 16) +
1474 tape->drv_write_prot = (buf[2] & 0x80) >> 7;
1477 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1479 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1481 idetape_tape_t *tape;
1484 if (i >= MAX_HWIFS * MAX_DRIVES)
1488 tape = ide_tape_chrdev_get(i);
1494 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1497 * We really want to do nonseekable_open(inode, filp); here, but some
1498 * versions of tar incorrectly call lseek on tapes and bail out if that
1499 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1501 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1503 drive = tape->drive;
1505 filp->private_data = tape;
1507 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
1512 retval = idetape_wait_ready(drive, 60 * HZ);
1514 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1515 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
1519 idetape_read_position(drive);
1520 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
1521 (void)idetape_rewind_tape(drive);
1523 /* Read block size and write protect status from drive. */
1524 ide_tape_get_bsize_from_bdesc(drive);
1526 /* Set write protect flag if device is opened as read-only. */
1527 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1528 tape->write_prot = 1;
1530 tape->write_prot = tape->drv_write_prot;
1532 /* Make sure drive isn't write protected if user wants to write. */
1533 if (tape->write_prot) {
1534 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
1535 (filp->f_flags & O_ACCMODE) == O_RDWR) {
1536 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1542 /* Lock the tape drive door so user can't eject. */
1543 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1544 if (!ide_set_media_lock(drive, tape->disk, 1)) {
1545 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
1546 tape->door_locked = DOOR_LOCKED;
1558 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
1560 idetape_tape_t *tape = drive->driver_data;
1562 ide_tape_flush_merge_buffer(drive);
1563 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
1564 if (tape->buf != NULL) {
1565 idetape_pad_zeros(drive, tape->blk_size *
1566 (tape->user_bs_factor - 1));
1570 idetape_write_filemark(drive);
1571 idetape_flush_tape_buffers(drive);
1572 idetape_flush_tape_buffers(drive);
1575 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
1577 struct ide_tape_obj *tape = filp->private_data;
1578 ide_drive_t *drive = tape->drive;
1579 unsigned int minor = iminor(inode);
1582 tape = drive->driver_data;
1584 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1586 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1587 idetape_write_release(drive, minor);
1588 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1590 ide_tape_discard_merge_buffer(drive, 1);
1593 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
1594 (void) idetape_rewind_tape(drive);
1595 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1596 if (tape->door_locked == DOOR_LOCKED) {
1597 if (!ide_set_media_lock(drive, tape->disk, 0))
1598 tape->door_locked = DOOR_UNLOCKED;
1601 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
1607 static void idetape_get_inquiry_results(ide_drive_t *drive)
1609 idetape_tape_t *tape = drive->driver_data;
1610 struct ide_atapi_pc pc;
1612 char fw_rev[4], vendor_id[8], product_id[16];
1614 idetape_create_inquiry_cmd(&pc);
1615 pc.buf_size = sizeof(pc_buf);
1617 if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) {
1618 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
1622 memcpy(vendor_id, &pc_buf[8], 8);
1623 memcpy(product_id, &pc_buf[16], 16);
1624 memcpy(fw_rev, &pc_buf[32], 4);
1626 ide_fixstring(vendor_id, 8, 0);
1627 ide_fixstring(product_id, 16, 0);
1628 ide_fixstring(fw_rev, 4, 0);
1630 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
1631 drive->name, tape->name, vendor_id, product_id, fw_rev);
1635 * Ask the tape about its various parameters. In particular, we will adjust our
1636 * data transfer buffer size to the recommended value as returned by the tape.
1638 static void idetape_get_mode_sense_results(ide_drive_t *drive)
1640 idetape_tape_t *tape = drive->driver_data;
1641 struct ide_atapi_pc pc;
1643 u8 speed, max_speed;
1645 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
1646 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
1647 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
1648 " some default values\n");
1649 tape->blk_size = 512;
1650 put_unaligned(52, (u16 *)&tape->caps[12]);
1651 put_unaligned(540, (u16 *)&tape->caps[14]);
1652 put_unaligned(6*52, (u16 *)&tape->caps[16]);
1655 caps = buf + 4 + buf[3];
1657 /* convert to host order and save for later use */
1658 speed = be16_to_cpup((__be16 *)&caps[14]);
1659 max_speed = be16_to_cpup((__be16 *)&caps[8]);
1661 *(u16 *)&caps[8] = max_speed;
1662 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
1663 *(u16 *)&caps[14] = speed;
1664 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
1667 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
1668 "(assuming 650KB/sec)\n", drive->name);
1669 *(u16 *)&caps[14] = 650;
1672 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
1673 "(assuming 650KB/sec)\n", drive->name);
1674 *(u16 *)&caps[8] = 650;
1677 memcpy(&tape->caps, caps, 20);
1679 /* device lacks locking support according to capabilities page */
1680 if ((caps[6] & 1) == 0)
1681 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
1684 tape->blk_size = 512;
1685 else if (caps[7] & 0x04)
1686 tape->blk_size = 1024;
1689 #ifdef CONFIG_IDE_PROC_FS
1690 #define ide_tape_devset_get(name, field) \
1691 static int get_##name(ide_drive_t *drive) \
1693 idetape_tape_t *tape = drive->driver_data; \
1694 return tape->field; \
1697 #define ide_tape_devset_set(name, field) \
1698 static int set_##name(ide_drive_t *drive, int arg) \
1700 idetape_tape_t *tape = drive->driver_data; \
1701 tape->field = arg; \
1705 #define ide_tape_devset_rw_field(_name, _field) \
1706 ide_tape_devset_get(_name, _field) \
1707 ide_tape_devset_set(_name, _field) \
1708 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
1710 #define ide_tape_devset_r_field(_name, _field) \
1711 ide_tape_devset_get(_name, _field) \
1712 IDE_DEVSET(_name, 0, get_##_name, NULL)
1714 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
1715 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
1716 static int divf_buffer(ide_drive_t *drive) { return 2; }
1717 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
1719 ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP);
1721 ide_tape_devset_rw_field(debug_mask, debug_mask);
1722 ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
1724 ide_tape_devset_r_field(avg_speed, avg_speed);
1725 ide_tape_devset_r_field(speed, caps[14]);
1726 ide_tape_devset_r_field(buffer, caps[16]);
1727 ide_tape_devset_r_field(buffer_size, buffer_size);
1729 static const struct ide_proc_devset idetape_settings[] = {
1730 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
1731 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
1732 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
1733 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL),
1734 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
1735 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
1736 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
1737 mulf_tdsc, divf_tdsc),
1743 * The function below is called to:
1745 * 1. Initialize our various state variables.
1746 * 2. Ask the tape for its capabilities.
1747 * 3. Allocate a buffer which will be used for data transfer. The buffer size
1748 * is chosen based on the recommendation which we received in step 2.
1750 * Note that at this point ide.c already assigned us an irq, so that we can
1751 * queue requests here and wait for their completion.
1753 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
1758 u16 *ctl = (u16 *)&tape->caps[12];
1760 drive->pc_callback = ide_tape_callback;
1762 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
1764 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
1765 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
1767 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1770 /* Seagate Travan drives do not support DSC overlap. */
1771 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
1772 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1774 tape->minor = minor;
1775 tape->name[0] = 'h';
1776 tape->name[1] = 't';
1777 tape->name[2] = '0' + minor;
1778 tape->chrdev_dir = IDETAPE_DIR_NONE;
1780 idetape_get_inquiry_results(drive);
1781 idetape_get_mode_sense_results(drive);
1782 ide_tape_get_bsize_from_bdesc(drive);
1783 tape->user_bs_factor = 1;
1784 tape->buffer_size = *ctl * tape->blk_size;
1785 while (tape->buffer_size > 0xffff) {
1786 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
1788 tape->buffer_size = *ctl * tape->blk_size;
1790 buffer_size = tape->buffer_size;
1792 /* select the "best" DSC read/write polling freq */
1793 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
1795 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
1798 * Ensure that the number we got makes sense; limit it within
1799 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
1801 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
1802 IDETAPE_DSC_RW_MAX);
1803 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
1805 drive->name, tape->name, *(u16 *)&tape->caps[14],
1806 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
1807 tape->buffer_size / 1024,
1808 tape->best_dsc_rw_freq * 1000 / HZ,
1809 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : "");
1811 ide_proc_register_driver(drive, tape->driver);
1814 static void ide_tape_remove(ide_drive_t *drive)
1816 idetape_tape_t *tape = drive->driver_data;
1818 ide_proc_unregister_driver(drive, tape->driver);
1819 device_del(&tape->dev);
1820 ide_unregister_region(tape->disk);
1822 mutex_lock(&idetape_ref_mutex);
1823 put_device(&tape->dev);
1824 mutex_unlock(&idetape_ref_mutex);
1827 static void ide_tape_release(struct device *dev)
1829 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj);
1830 ide_drive_t *drive = tape->drive;
1831 struct gendisk *g = tape->disk;
1833 BUG_ON(tape->valid);
1835 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
1836 drive->driver_data = NULL;
1837 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
1838 device_destroy(idetape_sysfs_class,
1839 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
1840 idetape_devs[tape->minor] = NULL;
1841 g->private_data = NULL;
1846 #ifdef CONFIG_IDE_PROC_FS
1847 static int proc_idetape_read_name
1848 (char *page, char **start, off_t off, int count, int *eof, void *data)
1850 ide_drive_t *drive = (ide_drive_t *) data;
1851 idetape_tape_t *tape = drive->driver_data;
1855 len = sprintf(out, "%s\n", tape->name);
1856 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
1859 static ide_proc_entry_t idetape_proc[] = {
1860 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
1861 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
1862 { NULL, 0, NULL, NULL }
1865 static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive)
1867 return idetape_proc;
1870 static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive)
1872 return idetape_settings;
1876 static int ide_tape_probe(ide_drive_t *);
1878 static struct ide_driver idetape_driver = {
1880 .owner = THIS_MODULE,
1882 .bus = &ide_bus_type,
1884 .probe = ide_tape_probe,
1885 .remove = ide_tape_remove,
1886 .version = IDETAPE_VERSION,
1887 .do_request = idetape_do_request,
1888 #ifdef CONFIG_IDE_PROC_FS
1889 .proc_entries = ide_tape_proc_entries,
1890 .proc_devsets = ide_tape_proc_devsets,
1894 /* Our character device supporting functions, passed to register_chrdev. */
1895 static const struct file_operations idetape_fops = {
1896 .owner = THIS_MODULE,
1897 .read = idetape_chrdev_read,
1898 .write = idetape_chrdev_write,
1899 .ioctl = idetape_chrdev_ioctl,
1900 .open = idetape_chrdev_open,
1901 .release = idetape_chrdev_release,
1904 static int idetape_open(struct block_device *bdev, fmode_t mode)
1906 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk);
1914 static int idetape_release(struct gendisk *disk, fmode_t mode)
1916 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj);
1922 static int idetape_ioctl(struct block_device *bdev, fmode_t mode,
1923 unsigned int cmd, unsigned long arg)
1925 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj);
1926 ide_drive_t *drive = tape->drive;
1927 int err = generic_ide_ioctl(drive, bdev, cmd, arg);
1929 err = idetape_blkdev_ioctl(drive, cmd, arg);
1933 static struct block_device_operations idetape_block_ops = {
1934 .owner = THIS_MODULE,
1935 .open = idetape_open,
1936 .release = idetape_release,
1937 .locked_ioctl = idetape_ioctl,
1940 static int ide_tape_probe(ide_drive_t *drive)
1942 idetape_tape_t *tape;
1946 if (!strstr("ide-tape", drive->driver_req))
1949 if (drive->media != ide_tape)
1952 if ((drive->dev_flags & IDE_DFLAG_ID_READ) &&
1953 ide_check_atapi_device(drive, DRV_NAME) == 0) {
1954 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
1955 " the driver\n", drive->name);
1958 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
1960 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
1965 g = alloc_disk(1 << PARTN_BITS);
1969 ide_init_disk(g, drive);
1971 tape->dev.parent = &drive->gendev;
1972 tape->dev.release = ide_tape_release;
1973 dev_set_name(&tape->dev, dev_name(&drive->gendev));
1975 if (device_register(&tape->dev))
1978 tape->drive = drive;
1979 tape->driver = &idetape_driver;
1982 g->private_data = &tape->driver;
1984 drive->driver_data = tape;
1986 mutex_lock(&idetape_ref_mutex);
1987 for (minor = 0; idetape_devs[minor]; minor++)
1989 idetape_devs[minor] = tape;
1990 mutex_unlock(&idetape_ref_mutex);
1992 idetape_setup(drive, tape, minor);
1994 device_create(idetape_sysfs_class, &drive->gendev,
1995 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name);
1996 device_create(idetape_sysfs_class, &drive->gendev,
1997 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2000 g->fops = &idetape_block_ops;
2001 ide_register_region(g);
2013 static void __exit idetape_exit(void)
2015 driver_unregister(&idetape_driver.gen_driver);
2016 class_destroy(idetape_sysfs_class);
2017 unregister_chrdev(IDETAPE_MAJOR, "ht");
2020 static int __init idetape_init(void)
2023 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2024 if (IS_ERR(idetape_sysfs_class)) {
2025 idetape_sysfs_class = NULL;
2026 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2031 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2032 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2035 goto out_free_class;
2038 error = driver_register(&idetape_driver.gen_driver);
2040 goto out_free_driver;
2045 driver_unregister(&idetape_driver.gen_driver);
2047 class_destroy(idetape_sysfs_class);
2052 MODULE_ALIAS("ide:*m-tape*");
2053 module_init(idetape_init);
2054 module_exit(idetape_exit);
2055 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2056 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2057 MODULE_LICENSE("GPL");