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 IDETAPE_VERSION "1.20"
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/timer.h>
27 #include <linux/interrupt.h>
28 #include <linux/jiffies.h>
29 #include <linux/major.h>
30 #include <linux/errno.h>
31 #include <linux/genhd.h>
32 #include <linux/slab.h>
33 #include <linux/pci.h>
34 #include <linux/ide.h>
35 #include <linux/smp_lock.h>
36 #include <linux/completion.h>
37 #include <linux/bitops.h>
38 #include <linux/mutex.h>
39 #include <scsi/scsi.h>
41 #include <asm/byteorder.h>
42 #include <linux/irq.h>
43 #include <linux/uaccess.h>
45 #include <asm/unaligned.h>
46 #include <linux/mtio.h>
49 /* output errors only */
51 /* output all sense key/asc */
53 /* info regarding all chrdev-related procedures */
54 DBG_CHRDEV = (1 << 2),
55 /* all remaining procedures */
57 /* buffer alloc info (pc_stack & rq_stack) */
58 DBG_PCRQ_STACK = (1 << 4),
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 *****************************/
78 * Pipelined mode parameters.
80 * We try to use the minimum number of stages which is enough to keep the tape
81 * constantly streaming. To accomplish that, we implement a feedback loop around
82 * the maximum number of stages:
84 * We start from MIN maximum stages (we will not even use MIN stages if we don't
85 * need them), increment it by RATE*(MAX-MIN) whenever we sense that the
86 * pipeline is empty, until we reach the optimum value or until we reach MAX.
88 #define IDETAPE_MIN_PIPELINE_STAGES 1
89 #define IDETAPE_MAX_PIPELINE_STAGES 400
90 #define IDETAPE_INCREASE_STAGES_RATE 20
93 * After each failed packet command we issue a request sense command and retry
94 * the packet command IDETAPE_MAX_PC_RETRIES times.
96 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
98 #define IDETAPE_MAX_PC_RETRIES 3
101 * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE
102 * bytes. This is used for several packet commands (Not for READ/WRITE commands)
104 #define IDETAPE_PC_BUFFER_SIZE 256
107 * In various places in the driver, we need to allocate storage
108 * for packet commands and requests, which will remain valid while
109 * we leave the driver to wait for an interrupt or a timeout event.
111 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
114 * Some drives (for example, Seagate STT3401A Travan) require a very long
115 * timeout, because they don't return an interrupt or clear their busy bit
116 * until after the command completes (even retension commands).
118 #define IDETAPE_WAIT_CMD (900*HZ)
121 * The following parameter is used to select the point in the internal tape fifo
122 * in which we will start to refill the buffer. Decreasing the following
123 * parameter will improve the system's latency and interactive response, while
124 * using a high value might improve system throughput.
126 #define IDETAPE_FIFO_THRESHOLD 2
129 * DSC polling parameters.
131 * Polling for DSC (a single bit in the status register) is a very important
132 * function in ide-tape. There are two cases in which we poll for DSC:
134 * 1. Before a read/write packet command, to ensure that we can transfer data
135 * from/to the tape's data buffers, without causing an actual media access.
136 * In case the tape is not ready yet, we take out our request from the device
137 * request queue, so that ide.c could service requests from the other device
138 * on the same interface in the meantime.
140 * 2. After the successful initialization of a "media access packet command",
141 * which is a command that can take a long time to complete (the interval can
142 * range from several seconds to even an hour). Again, we postpone our request
143 * in the middle to free the bus for the other device. The polling frequency
144 * here should be lower than the read/write frequency since those media access
145 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
146 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
147 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
149 * We also set a timeout for the timer, in case something goes wrong. The
150 * timeout should be longer then the maximum execution time of a tape operation.
154 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
155 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
156 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
157 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
158 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
159 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
160 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
162 /*************************** End of tunable parameters ***********************/
164 /* Read/Write error simulation */
165 #define SIMULATE_ERRORS 0
167 /* tape directions */
169 IDETAPE_DIR_NONE = (1 << 0),
170 IDETAPE_DIR_READ = (1 << 1),
171 IDETAPE_DIR_WRITE = (1 << 2),
177 struct idetape_bh *b_reqnext;
181 /* Tape door status */
182 #define DOOR_UNLOCKED 0
183 #define DOOR_LOCKED 1
184 #define DOOR_EXPLICITLY_LOCKED 2
186 /* Some defines for the SPACE command */
187 #define IDETAPE_SPACE_OVER_FILEMARK 1
188 #define IDETAPE_SPACE_TO_EOD 3
190 /* Some defines for the LOAD UNLOAD command */
191 #define IDETAPE_LU_LOAD_MASK 1
192 #define IDETAPE_LU_RETENSION_MASK 2
193 #define IDETAPE_LU_EOT_MASK 4
196 * Special requests for our block device strategy routine.
198 * In order to service a character device command, we add special requests to
199 * the tail of our block device request queue and wait for their completion.
203 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
204 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
205 REQ_IDETAPE_READ = (1 << 2),
206 REQ_IDETAPE_WRITE = (1 << 3),
209 /* Error codes returned in rq->errors to the higher part of the driver. */
210 #define IDETAPE_ERROR_GENERAL 101
211 #define IDETAPE_ERROR_FILEMARK 102
212 #define IDETAPE_ERROR_EOD 103
214 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
215 #define IDETAPE_BLOCK_DESCRIPTOR 0
216 #define IDETAPE_CAPABILITIES_PAGE 0x2a
218 /* Tape flag bits values. */
220 IDETAPE_FLAG_IGNORE_DSC = (1 << 0),
221 /* 0 When the tape position is unknown */
222 IDETAPE_FLAG_ADDRESS_VALID = (1 << 1),
223 /* Device already opened */
224 IDETAPE_FLAG_BUSY = (1 << 2),
225 /* Attempt to auto-detect the current user block size */
226 IDETAPE_FLAG_DETECT_BS = (1 << 3),
227 /* Currently on a filemark */
228 IDETAPE_FLAG_FILEMARK = (1 << 4),
229 /* DRQ interrupt device */
230 IDETAPE_FLAG_DRQ_INTERRUPT = (1 << 5),
231 /* 0 = no tape is loaded, so we don't rewind after ejecting */
232 IDETAPE_FLAG_MEDIUM_PRESENT = (1 << 6),
235 /* A pipeline stage. */
236 typedef struct idetape_stage_s {
237 struct request rq; /* The corresponding request */
238 struct idetape_bh *bh; /* The data buffers */
239 struct idetape_stage_s *next; /* Pointer to the next stage */
243 * Most of our global data which we need to save even as we leave the driver due
244 * to an interrupt or a timer event is stored in the struct defined below.
246 typedef struct ide_tape_obj {
248 ide_driver_t *driver;
249 struct gendisk *disk;
253 * Since a typical character device operation requires more
254 * than one packet command, we provide here enough memory
255 * for the maximum of interconnected packet commands.
256 * The packet commands are stored in the circular array pc_stack.
257 * pc_stack_index points to the last used entry, and warps around
258 * to the start when we get to the last array entry.
260 * pc points to the current processed packet command.
262 * failed_pc points to the last failed packet command, or contains
263 * NULL if we do not need to retry any packet command. This is
264 * required since an additional packet command is needed before the
265 * retry, to get detailed information on what went wrong.
267 /* Current packet command */
268 struct ide_atapi_pc *pc;
269 /* Last failed packet command */
270 struct ide_atapi_pc *failed_pc;
271 /* Packet command stack */
272 struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK];
273 /* Next free packet command storage space */
275 struct request rq_stack[IDETAPE_PC_STACK];
276 /* We implement a circular array */
280 * DSC polling variables.
282 * While polling for DSC we use postponed_rq to postpone the current
283 * request so that ide.c will be able to service pending requests on the
284 * other device. Note that at most we will have only one DSC (usually
285 * data transfer) request in the device request queue. Additional
286 * requests can be queued in our internal pipeline, but they will be
287 * visible to ide.c only one at a time.
289 struct request *postponed_rq;
290 /* The time in which we started polling for DSC */
291 unsigned long dsc_polling_start;
292 /* Timer used to poll for dsc */
293 struct timer_list dsc_timer;
294 /* Read/Write dsc polling frequency */
295 unsigned long best_dsc_rw_freq;
296 unsigned long dsc_poll_freq;
297 unsigned long dsc_timeout;
299 /* Read position information */
302 unsigned int first_frame;
304 /* Last error information */
305 u8 sense_key, asc, ascq;
307 /* Character device operation */
311 /* Current character device data transfer direction */
314 /* tape block size, usually 512 or 1024 bytes */
315 unsigned short blk_size;
318 /* Copy of the tape's Capabilities and Mechanical Page */
322 * Active data transfer request parameters.
324 * At most, there is only one ide-tape originated data transfer request
325 * in the device request queue. This allows ide.c to easily service
326 * requests from the other device when we postpone our active request.
329 /* Data buffer size chosen based on the tape's recommendation */
331 idetape_stage_t *merge_stage;
332 int merge_stage_size;
333 struct idetape_bh *bh;
337 /* Pipeline parameters. */
339 /* Wasted space in each stage */
342 /* Status/Action flags: long for set_bit */
344 /* protects the ide-tape queue */
347 /* Measures average tape speed */
348 unsigned long avg_time;
352 /* the door is currently locked */
354 /* the tape hardware is write protected */
356 /* the tape is write protected (hardware or opened as read-only) */
362 static DEFINE_MUTEX(idetape_ref_mutex);
364 static struct class *idetape_sysfs_class;
366 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
368 #define ide_tape_g(disk) \
369 container_of((disk)->private_data, struct ide_tape_obj, driver)
371 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
373 struct ide_tape_obj *tape = NULL;
375 mutex_lock(&idetape_ref_mutex);
376 tape = ide_tape_g(disk);
378 kref_get(&tape->kref);
379 mutex_unlock(&idetape_ref_mutex);
383 static void ide_tape_release(struct kref *);
385 static void ide_tape_put(struct ide_tape_obj *tape)
387 mutex_lock(&idetape_ref_mutex);
388 kref_put(&tape->kref, ide_tape_release);
389 mutex_unlock(&idetape_ref_mutex);
393 * The variables below are used for the character device interface. Additional
394 * state variables are defined in our ide_drive_t structure.
396 static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
398 #define ide_tape_f(file) ((file)->private_data)
400 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
402 struct ide_tape_obj *tape = NULL;
404 mutex_lock(&idetape_ref_mutex);
405 tape = idetape_devs[i];
407 kref_get(&tape->kref);
408 mutex_unlock(&idetape_ref_mutex);
412 static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
415 struct idetape_bh *bh = pc->bh;
420 printk(KERN_ERR "ide-tape: bh == NULL in "
421 "idetape_input_buffers\n");
422 ide_atapi_discard_data(drive, bcount);
426 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
428 HWIF(drive)->atapi_input_bytes(drive, bh->b_data +
429 atomic_read(&bh->b_count), count);
431 atomic_add(count, &bh->b_count);
432 if (atomic_read(&bh->b_count) == bh->b_size) {
435 atomic_set(&bh->b_count, 0);
441 static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
444 struct idetape_bh *bh = pc->bh;
449 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
453 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
454 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
457 pc->b_count -= count;
462 pc->b_data = bh->b_data;
463 pc->b_count = atomic_read(&bh->b_count);
469 static void idetape_update_buffers(struct ide_atapi_pc *pc)
471 struct idetape_bh *bh = pc->bh;
473 unsigned int bcount = pc->xferred;
475 if (pc->flags & PC_FLAG_WRITING)
479 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
483 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
484 atomic_set(&bh->b_count, count);
485 if (atomic_read(&bh->b_count) == bh->b_size)
493 * idetape_next_pc_storage returns a pointer to a place in which we can
494 * safely store a packet command, even though we intend to leave the
495 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
496 * commands is allocated at initialization time.
498 static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive)
500 idetape_tape_t *tape = drive->driver_data;
502 debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index);
504 if (tape->pc_stack_index == IDETAPE_PC_STACK)
505 tape->pc_stack_index = 0;
506 return (&tape->pc_stack[tape->pc_stack_index++]);
510 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
511 * Since we queue packet commands in the request queue, we need to
512 * allocate a request, along with the allocation of a packet command.
515 /**************************************************************
517 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
518 * followed later on by kfree(). -ml *
520 **************************************************************/
522 static struct request *idetape_next_rq_storage(ide_drive_t *drive)
524 idetape_tape_t *tape = drive->driver_data;
526 debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index);
528 if (tape->rq_stack_index == IDETAPE_PC_STACK)
529 tape->rq_stack_index = 0;
530 return (&tape->rq_stack[tape->rq_stack_index++]);
533 static void idetape_init_pc(struct ide_atapi_pc *pc)
535 memset(pc->c, 0, 12);
539 pc->buf = pc->pc_buf;
540 pc->buf_size = IDETAPE_PC_BUFFER_SIZE;
546 * called on each failed packet command retry to analyze the request sense. We
547 * currently do not utilize this information.
549 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
551 idetape_tape_t *tape = drive->driver_data;
552 struct ide_atapi_pc *pc = tape->failed_pc;
554 tape->sense_key = sense[2] & 0xF;
555 tape->asc = sense[12];
556 tape->ascq = sense[13];
558 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
559 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
561 /* Correct pc->xferred by asking the tape. */
562 if (pc->flags & PC_FLAG_DMA_ERROR) {
563 pc->xferred = pc->req_xfer -
565 be32_to_cpu(get_unaligned((u32 *)&sense[3]));
566 idetape_update_buffers(pc);
570 * If error was the result of a zero-length read or write command,
571 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
572 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
574 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
576 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
577 if (tape->sense_key == 5) {
578 /* don't report an error, everything's ok */
580 /* don't retry read/write */
581 pc->flags |= PC_FLAG_ABORT;
584 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
585 pc->error = IDETAPE_ERROR_FILEMARK;
586 pc->flags |= PC_FLAG_ABORT;
588 if (pc->c[0] == WRITE_6) {
589 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
590 && tape->asc == 0x0 && tape->ascq == 0x2)) {
591 pc->error = IDETAPE_ERROR_EOD;
592 pc->flags |= PC_FLAG_ABORT;
595 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
596 if (tape->sense_key == 8) {
597 pc->error = IDETAPE_ERROR_EOD;
598 pc->flags |= PC_FLAG_ABORT;
600 if (!(pc->flags & PC_FLAG_ABORT) &&
602 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
606 /* Free a stage along with its related buffers completely. */
607 static void __idetape_kfree_stage(idetape_stage_t *stage)
609 struct idetape_bh *prev_bh, *bh = stage->bh;
613 if (bh->b_data != NULL) {
614 size = (int) bh->b_size;
616 free_page((unsigned long) bh->b_data);
618 bh->b_data += PAGE_SIZE;
629 * Finish servicing a request and insert a pending pipeline request into the
632 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
634 struct request *rq = HWGROUP(drive)->rq;
635 idetape_tape_t *tape = drive->driver_data;
639 debug_log(DBG_PROCS, "Enter %s\n", __func__);
642 case 0: error = IDETAPE_ERROR_GENERAL; break;
643 case 1: error = 0; break;
644 default: error = uptodate;
648 tape->failed_pc = NULL;
650 if (!blk_special_request(rq)) {
651 ide_end_request(drive, uptodate, nr_sects);
655 spin_lock_irqsave(&tape->lock, flags);
657 ide_end_drive_cmd(drive, 0, 0);
659 spin_unlock_irqrestore(&tape->lock, flags);
663 static ide_startstop_t idetape_request_sense_callback(ide_drive_t *drive)
665 idetape_tape_t *tape = drive->driver_data;
667 debug_log(DBG_PROCS, "Enter %s\n", __func__);
669 if (!tape->pc->error) {
670 idetape_analyze_error(drive, tape->pc->buf);
671 idetape_end_request(drive, 1, 0);
673 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - "
674 "Aborting request!\n");
675 idetape_end_request(drive, 0, 0);
680 static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc)
683 pc->c[0] = REQUEST_SENSE;
686 pc->idetape_callback = &idetape_request_sense_callback;
689 static void idetape_init_rq(struct request *rq, u8 cmd)
691 memset(rq, 0, sizeof(*rq));
692 rq->cmd_type = REQ_TYPE_SPECIAL;
697 * Generate a new packet command request in front of the request queue, before
698 * the current request, so that it will be processed immediately, on the next
699 * pass through the driver. The function below is called from the request
700 * handling part of the driver (the "bottom" part). Safe storage for the request
701 * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that.
703 * Memory for those requests is pre-allocated at initialization time, and is
704 * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for
705 * the maximum possible number of inter-dependent packet commands.
707 * The higher level of the driver - The ioctl handler and the character device
708 * handling functions should queue request to the lower level part and wait for
709 * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail.
711 static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc,
714 struct ide_tape_obj *tape = drive->driver_data;
716 idetape_init_rq(rq, REQ_IDETAPE_PC1);
717 rq->buffer = (char *) pc;
718 rq->rq_disk = tape->disk;
719 (void) ide_do_drive_cmd(drive, rq, ide_preempt);
723 * idetape_retry_pc is called when an error was detected during the
724 * last packet command. We queue a request sense packet command in
725 * the head of the request list.
727 static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
729 idetape_tape_t *tape = drive->driver_data;
730 struct ide_atapi_pc *pc;
733 (void)ide_read_error(drive);
734 pc = idetape_next_pc_storage(drive);
735 rq = idetape_next_rq_storage(drive);
736 idetape_create_request_sense_cmd(pc);
737 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
738 idetape_queue_pc_head(drive, pc, rq);
743 * Postpone the current request so that ide.c will be able to service requests
744 * from another device on the same hwgroup while we are polling for DSC.
746 static void idetape_postpone_request(ide_drive_t *drive)
748 idetape_tape_t *tape = drive->driver_data;
750 debug_log(DBG_PROCS, "Enter %s\n", __func__);
752 tape->postponed_rq = HWGROUP(drive)->rq;
753 ide_stall_queue(drive, tape->dsc_poll_freq);
756 typedef void idetape_io_buf(ide_drive_t *, struct ide_atapi_pc *, unsigned int);
759 * This is the usual interrupt handler which will be called during a packet
760 * command. We will transfer some of the data (as requested by the drive) and
761 * will re-point interrupt handler to us. When data transfer is finished, we
762 * will act according to the algorithm described before
765 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
767 ide_hwif_t *hwif = drive->hwif;
768 idetape_tape_t *tape = drive->driver_data;
769 struct ide_atapi_pc *pc = tape->pc;
770 xfer_func_t *xferfunc;
771 idetape_io_buf *iobuf;
774 static int error_sim_count;
779 debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__);
781 /* Clear the interrupt */
782 stat = ide_read_status(drive);
784 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
785 if (hwif->dma_ops->dma_end(drive) || (stat & ERR_STAT)) {
787 * A DMA error is sometimes expected. For example,
788 * if the tape is crossing a filemark during a
789 * READ command, it will issue an irq and position
790 * itself before the filemark, so that only a partial
791 * data transfer will occur (which causes the DMA
792 * error). In that case, we will later ask the tape
793 * how much bytes of the original request were
794 * actually transferred (we can't receive that
795 * information from the DMA engine on most chipsets).
799 * On the contrary, a DMA error is never expected;
800 * it usually indicates a hardware error or abort.
801 * If the tape crosses a filemark during a READ
802 * command, it will issue an irq and position itself
803 * after the filemark (not before). Only a partial
804 * data transfer will occur, but no DMA error.
807 pc->flags |= PC_FLAG_DMA_ERROR;
809 pc->xferred = pc->req_xfer;
810 idetape_update_buffers(pc);
812 debug_log(DBG_PROCS, "DMA finished\n");
816 /* No more interrupts */
817 if ((stat & DRQ_STAT) == 0) {
818 debug_log(DBG_SENSE, "Packet command completed, %d bytes"
819 " transferred\n", pc->xferred);
821 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
825 if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) &&
826 (++error_sim_count % 100) == 0) {
827 printk(KERN_INFO "ide-tape: %s: simulating error\n",
832 if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
834 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
836 debug_log(DBG_ERR, "%s: I/O error\n", tape->name);
838 if (pc->c[0] == REQUEST_SENSE) {
839 printk(KERN_ERR "ide-tape: I/O error in request"
841 return ide_do_reset(drive);
843 debug_log(DBG_ERR, "[cmd %x]: check condition\n",
846 /* Retry operation */
847 return idetape_retry_pc(drive);
850 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
851 (stat & SEEK_STAT) == 0) {
852 /* Media access command */
853 tape->dsc_polling_start = jiffies;
854 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
855 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
856 /* Allow ide.c to handle other requests */
857 idetape_postpone_request(drive);
860 if (tape->failed_pc == pc)
861 tape->failed_pc = NULL;
862 /* Command finished - Call the callback function */
863 return pc->idetape_callback(drive);
866 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
867 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
868 printk(KERN_ERR "ide-tape: The tape wants to issue more "
869 "interrupts in DMA mode\n");
870 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
872 return ide_do_reset(drive);
874 /* Get the number of bytes to transfer on this interrupt. */
875 bcount = (hwif->INB(hwif->io_ports[IDE_BCOUNTH_OFFSET]) << 8) |
876 hwif->INB(hwif->io_ports[IDE_BCOUNTL_OFFSET]);
878 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
881 printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__);
882 return ide_do_reset(drive);
884 if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
885 /* Hopefully, we will never get here */
886 printk(KERN_ERR "ide-tape: We wanted to %s, ",
887 (ireason & IO) ? "Write" : "Read");
888 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
889 (ireason & IO) ? "Read" : "Write");
890 return ide_do_reset(drive);
892 if (!(pc->flags & PC_FLAG_WRITING)) {
893 /* Reading - Check that we have enough space */
894 temp = pc->xferred + bcount;
895 if (temp > pc->req_xfer) {
896 if (temp > pc->buf_size) {
897 printk(KERN_ERR "ide-tape: The tape wants to "
898 "send us more data than expected "
899 "- discarding data\n");
900 ide_atapi_discard_data(drive, bcount);
901 ide_set_handler(drive, &idetape_pc_intr,
902 IDETAPE_WAIT_CMD, NULL);
905 debug_log(DBG_SENSE, "The tape wants to send us more "
906 "data than expected - allowing transfer\n");
908 iobuf = &idetape_input_buffers;
909 xferfunc = hwif->atapi_input_bytes;
911 iobuf = &idetape_output_buffers;
912 xferfunc = hwif->atapi_output_bytes;
916 iobuf(drive, pc, bcount);
918 xferfunc(drive, pc->cur_pos, bcount);
920 /* Update the current position */
921 pc->xferred += bcount;
922 pc->cur_pos += bcount;
924 debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n",
927 /* And set the interrupt handler again */
928 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
933 * Packet Command Interface
935 * The current Packet Command is available in tape->pc, and will not change
936 * until we finish handling it. Each packet command is associated with a
937 * callback function that will be called when the command is finished.
939 * The handling will be done in three stages:
941 * 1. idetape_issue_pc will send the packet command to the drive, and will set
942 * the interrupt handler to idetape_pc_intr.
944 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
945 * repeated until the device signals us that no more interrupts will be issued.
947 * 3. ATAPI Tape media access commands have immediate status with a delayed
948 * process. In case of a successful initiation of a media access packet command,
949 * the DSC bit will be set when the actual execution of the command is finished.
950 * Since the tape drive will not issue an interrupt, we have to poll for this
951 * event. In this case, we define the request as "low priority request" by
952 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
955 * ide.c will then give higher priority to requests which originate from the
956 * other device, until will change rq_status to RQ_ACTIVE.
958 * 4. When the packet command is finished, it will be checked for errors.
960 * 5. In case an error was found, we queue a request sense packet command in
961 * front of the request queue and retry the operation up to
962 * IDETAPE_MAX_PC_RETRIES times.
964 * 6. In case no error was found, or we decided to give up and not to retry
965 * again, the callback function will be called and then we will handle the next
968 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
970 ide_hwif_t *hwif = drive->hwif;
971 idetape_tape_t *tape = drive->driver_data;
972 struct ide_atapi_pc *pc = tape->pc;
974 ide_startstop_t startstop;
977 if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
978 printk(KERN_ERR "ide-tape: Strange, packet command initiated "
979 "yet DRQ isn't asserted\n");
982 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
983 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
984 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
985 "a packet command, retrying\n");
987 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
989 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
990 "issuing a packet command, ignoring\n");
995 if ((ireason & CD) == 0 || (ireason & IO)) {
996 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
997 "a packet command\n");
998 return ide_do_reset(drive);
1000 /* Set the interrupt routine */
1001 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1002 #ifdef CONFIG_BLK_DEV_IDEDMA
1003 /* Begin DMA, if necessary */
1004 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS)
1005 hwif->dma_ops->dma_start(drive);
1007 /* Send the actual packet */
1008 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
1012 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
1013 struct ide_atapi_pc *pc)
1015 ide_hwif_t *hwif = drive->hwif;
1016 idetape_tape_t *tape = drive->driver_data;
1020 if (tape->pc->c[0] == REQUEST_SENSE &&
1021 pc->c[0] == REQUEST_SENSE) {
1022 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
1023 "Two request sense in serial were issued\n");
1026 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
1027 tape->failed_pc = pc;
1028 /* Set the current packet command */
1031 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
1032 (pc->flags & PC_FLAG_ABORT)) {
1034 * We will "abort" retrying a packet command in case legitimate
1035 * error code was received (crossing a filemark, or end of the
1036 * media, for example).
1038 if (!(pc->flags & PC_FLAG_ABORT)) {
1039 if (!(pc->c[0] == TEST_UNIT_READY &&
1040 tape->sense_key == 2 && tape->asc == 4 &&
1041 (tape->ascq == 1 || tape->ascq == 8))) {
1042 printk(KERN_ERR "ide-tape: %s: I/O error, "
1043 "pc = %2x, key = %2x, "
1044 "asc = %2x, ascq = %2x\n",
1045 tape->name, pc->c[0],
1046 tape->sense_key, tape->asc,
1050 pc->error = IDETAPE_ERROR_GENERAL;
1052 tape->failed_pc = NULL;
1053 return pc->idetape_callback(drive);
1055 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
1058 /* We haven't transferred any data yet */
1060 pc->cur_pos = pc->buf;
1061 /* Request to transfer the entire buffer at once */
1062 bcount = pc->req_xfer;
1064 if (pc->flags & PC_FLAG_DMA_ERROR) {
1065 pc->flags &= ~PC_FLAG_DMA_ERROR;
1066 printk(KERN_WARNING "ide-tape: DMA disabled, "
1067 "reverting to PIO\n");
1070 if ((pc->flags & PC_FLAG_DMA_RECOMMENDED) && drive->using_dma)
1071 dma_ok = !hwif->dma_ops->dma_setup(drive);
1073 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
1074 IDE_TFLAG_OUT_DEVICE, bcount, dma_ok);
1077 /* Will begin DMA later */
1078 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
1079 if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags)) {
1080 ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc,
1081 IDETAPE_WAIT_CMD, NULL);
1084 hwif->OUTB(WIN_PACKETCMD, hwif->io_ports[IDE_COMMAND_OFFSET]);
1085 return idetape_transfer_pc(drive);
1089 static ide_startstop_t idetape_pc_callback(ide_drive_t *drive)
1091 idetape_tape_t *tape = drive->driver_data;
1093 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1095 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
1099 /* A mode sense command is used to "sense" tape parameters. */
1100 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
1102 idetape_init_pc(pc);
1103 pc->c[0] = MODE_SENSE;
1104 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
1105 /* DBD = 1 - Don't return block descriptors */
1107 pc->c[2] = page_code;
1109 * Changed pc->c[3] to 0 (255 will at best return unused info).
1111 * For SCSI this byte is defined as subpage instead of high byte
1112 * of length and some IDE drives seem to interpret it this way
1113 * and return an error when 255 is used.
1116 /* We will just discard data in that case */
1118 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
1120 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
1124 pc->idetape_callback = &idetape_pc_callback;
1127 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
1129 idetape_tape_t *tape = drive->driver_data;
1130 struct ide_atapi_pc *pc = tape->pc;
1133 stat = ide_read_status(drive);
1135 if (stat & SEEK_STAT) {
1136 if (stat & ERR_STAT) {
1137 /* Error detected */
1138 if (pc->c[0] != TEST_UNIT_READY)
1139 printk(KERN_ERR "ide-tape: %s: I/O error, ",
1141 /* Retry operation */
1142 return idetape_retry_pc(drive);
1145 if (tape->failed_pc == pc)
1146 tape->failed_pc = NULL;
1148 pc->error = IDETAPE_ERROR_GENERAL;
1149 tape->failed_pc = NULL;
1151 return pc->idetape_callback(drive);
1154 static ide_startstop_t idetape_rw_callback(ide_drive_t *drive)
1156 idetape_tape_t *tape = drive->driver_data;
1157 struct request *rq = HWGROUP(drive)->rq;
1158 int blocks = tape->pc->xferred / tape->blk_size;
1160 tape->avg_size += blocks * tape->blk_size;
1162 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
1163 tape->avg_speed = tape->avg_size * HZ /
1164 (jiffies - tape->avg_time) / 1024;
1166 tape->avg_time = jiffies;
1168 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1170 tape->first_frame += blocks;
1171 rq->current_nr_sectors -= blocks;
1173 if (!tape->pc->error)
1174 idetape_end_request(drive, 1, 0);
1176 idetape_end_request(drive, tape->pc->error, 0);
1180 static void idetape_create_read_cmd(idetape_tape_t *tape,
1181 struct ide_atapi_pc *pc,
1182 unsigned int length, struct idetape_bh *bh)
1184 idetape_init_pc(pc);
1186 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
1188 pc->idetape_callback = &idetape_rw_callback;
1190 atomic_set(&bh->b_count, 0);
1192 pc->buf_size = length * tape->blk_size;
1193 pc->req_xfer = pc->buf_size;
1194 if (pc->req_xfer == tape->stage_size)
1195 pc->flags |= PC_FLAG_DMA_RECOMMENDED;
1198 static void idetape_create_write_cmd(idetape_tape_t *tape,
1199 struct ide_atapi_pc *pc,
1200 unsigned int length, struct idetape_bh *bh)
1202 idetape_init_pc(pc);
1204 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
1206 pc->idetape_callback = &idetape_rw_callback;
1207 pc->flags |= PC_FLAG_WRITING;
1209 pc->b_data = bh->b_data;
1210 pc->b_count = atomic_read(&bh->b_count);
1212 pc->buf_size = length * tape->blk_size;
1213 pc->req_xfer = pc->buf_size;
1214 if (pc->req_xfer == tape->stage_size)
1215 pc->flags |= PC_FLAG_DMA_RECOMMENDED;
1218 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
1219 struct request *rq, sector_t block)
1221 idetape_tape_t *tape = drive->driver_data;
1222 struct ide_atapi_pc *pc = NULL;
1223 struct request *postponed_rq = tape->postponed_rq;
1226 debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld,"
1227 " current_nr_sectors: %d\n",
1228 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
1230 if (!blk_special_request(rq)) {
1231 /* We do not support buffer cache originated requests. */
1232 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
1233 "request queue (%d)\n", drive->name, rq->cmd_type);
1234 ide_end_request(drive, 0, 0);
1238 /* Retry a failed packet command */
1239 if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE)
1240 return idetape_issue_pc(drive, tape->failed_pc);
1242 if (postponed_rq != NULL)
1243 if (rq != postponed_rq) {
1244 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
1245 "Two DSC requests were queued\n");
1246 idetape_end_request(drive, 0, 0);
1250 tape->postponed_rq = NULL;
1253 * If the tape is still busy, postpone our request and service
1254 * the other device meanwhile.
1256 stat = ide_read_status(drive);
1258 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
1259 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
1261 if (drive->post_reset == 1) {
1262 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
1263 drive->post_reset = 0;
1266 if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) &&
1267 (stat & SEEK_STAT) == 0) {
1268 if (postponed_rq == NULL) {
1269 tape->dsc_polling_start = jiffies;
1270 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
1271 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
1272 } else if (time_after(jiffies, tape->dsc_timeout)) {
1273 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
1275 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1276 idetape_media_access_finished(drive);
1279 return ide_do_reset(drive);
1281 } else if (time_after(jiffies,
1282 tape->dsc_polling_start +
1283 IDETAPE_DSC_MA_THRESHOLD))
1284 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
1285 idetape_postpone_request(drive);
1288 if (rq->cmd[0] & REQ_IDETAPE_READ) {
1289 pc = idetape_next_pc_storage(drive);
1290 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors,
1291 (struct idetape_bh *)rq->special);
1294 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
1295 pc = idetape_next_pc_storage(drive);
1296 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors,
1297 (struct idetape_bh *)rq->special);
1300 if (rq->cmd[0] & REQ_IDETAPE_PC1) {
1301 pc = (struct ide_atapi_pc *) rq->buffer;
1302 rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
1303 rq->cmd[0] |= REQ_IDETAPE_PC2;
1306 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1307 idetape_media_access_finished(drive);
1312 return idetape_issue_pc(drive, pc);
1315 /* Pipeline related functions */
1318 * The function below uses __get_free_page to allocate a pipeline stage, along
1319 * with all the necessary small buffers which together make a buffer of size
1320 * tape->stage_size (or a bit more). We attempt to combine sequential pages as
1323 * It returns a pointer to the new allocated stage, or NULL if we can't (or
1324 * don't want to) allocate a stage.
1326 * Pipeline stages are optional and are used to increase performance. If we
1327 * can't allocate them, we'll manage without them.
1329 static idetape_stage_t *__idetape_kmalloc_stage(idetape_tape_t *tape, int full,
1332 idetape_stage_t *stage;
1333 struct idetape_bh *prev_bh, *bh;
1334 int pages = tape->pages_per_stage;
1335 char *b_data = NULL;
1337 stage = kmalloc(sizeof(idetape_stage_t), GFP_KERNEL);
1342 stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1346 bh->b_reqnext = NULL;
1347 bh->b_data = (char *) __get_free_page(GFP_KERNEL);
1351 memset(bh->b_data, 0, PAGE_SIZE);
1352 bh->b_size = PAGE_SIZE;
1353 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1356 b_data = (char *) __get_free_page(GFP_KERNEL);
1360 memset(b_data, 0, PAGE_SIZE);
1361 if (bh->b_data == b_data + PAGE_SIZE) {
1362 bh->b_size += PAGE_SIZE;
1363 bh->b_data -= PAGE_SIZE;
1365 atomic_add(PAGE_SIZE, &bh->b_count);
1368 if (b_data == bh->b_data + bh->b_size) {
1369 bh->b_size += PAGE_SIZE;
1371 atomic_add(PAGE_SIZE, &bh->b_count);
1375 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1377 free_page((unsigned long) b_data);
1380 bh->b_reqnext = NULL;
1381 bh->b_data = b_data;
1382 bh->b_size = PAGE_SIZE;
1383 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1384 prev_bh->b_reqnext = bh;
1386 bh->b_size -= tape->excess_bh_size;
1388 atomic_sub(tape->excess_bh_size, &bh->b_count);
1391 __idetape_kfree_stage(stage);
1395 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
1396 const char __user *buf, int n)
1398 struct idetape_bh *bh = tape->bh;
1404 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1408 count = min((unsigned int)
1409 (bh->b_size - atomic_read(&bh->b_count)),
1411 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
1415 atomic_add(count, &bh->b_count);
1417 if (atomic_read(&bh->b_count) == bh->b_size) {
1420 atomic_set(&bh->b_count, 0);
1427 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
1430 struct idetape_bh *bh = tape->bh;
1436 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1440 count = min(tape->b_count, n);
1441 if (copy_to_user(buf, tape->b_data, count))
1444 tape->b_data += count;
1445 tape->b_count -= count;
1447 if (!tape->b_count) {
1451 tape->b_data = bh->b_data;
1452 tape->b_count = atomic_read(&bh->b_count);
1459 static void idetape_init_merge_stage(idetape_tape_t *tape)
1461 struct idetape_bh *bh = tape->merge_stage->bh;
1464 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1465 atomic_set(&bh->b_count, 0);
1467 tape->b_data = bh->b_data;
1468 tape->b_count = atomic_read(&bh->b_count);
1472 static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive)
1474 idetape_tape_t *tape = drive->driver_data;
1475 u8 *readpos = tape->pc->buf;
1477 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1479 if (!tape->pc->error) {
1480 debug_log(DBG_SENSE, "BOP - %s\n",
1481 (readpos[0] & 0x80) ? "Yes" : "No");
1482 debug_log(DBG_SENSE, "EOP - %s\n",
1483 (readpos[0] & 0x40) ? "Yes" : "No");
1485 if (readpos[0] & 0x4) {
1486 printk(KERN_INFO "ide-tape: Block location is unknown"
1488 clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags);
1489 idetape_end_request(drive, 0, 0);
1491 debug_log(DBG_SENSE, "Block Location - %u\n",
1492 be32_to_cpu(*(u32 *)&readpos[4]));
1494 tape->partition = readpos[1];
1496 be32_to_cpu(*(u32 *)&readpos[4]);
1497 set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags);
1498 idetape_end_request(drive, 1, 0);
1501 idetape_end_request(drive, 0, 0);
1507 * Write a filemark if write_filemark=1. Flush the device buffers without
1508 * writing a filemark otherwise.
1510 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1511 struct ide_atapi_pc *pc, int write_filemark)
1513 idetape_init_pc(pc);
1514 pc->c[0] = WRITE_FILEMARKS;
1515 pc->c[4] = write_filemark;
1516 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1517 pc->idetape_callback = &idetape_pc_callback;
1520 static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc)
1522 idetape_init_pc(pc);
1523 pc->c[0] = TEST_UNIT_READY;
1524 pc->idetape_callback = &idetape_pc_callback;
1528 * We add a special packet command request to the tail of the request queue, and
1529 * wait for it to be serviced. This is not to be called from within the request
1530 * handling part of the driver! We allocate here data on the stack and it is
1531 * valid until the request is finished. This is not the case for the bottom part
1532 * of the driver, where we are always leaving the functions to wait for an
1533 * interrupt or a timer event.
1535 * From the bottom part of the driver, we should allocate safe memory using
1536 * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request
1537 * to the request list without waiting for it to be serviced! In that case, we
1538 * usually use idetape_queue_pc_head().
1540 static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
1542 struct ide_tape_obj *tape = drive->driver_data;
1545 idetape_init_rq(&rq, REQ_IDETAPE_PC1);
1546 rq.buffer = (char *) pc;
1547 rq.rq_disk = tape->disk;
1548 return ide_do_drive_cmd(drive, &rq, ide_wait);
1551 static void idetape_create_load_unload_cmd(ide_drive_t *drive,
1552 struct ide_atapi_pc *pc, int cmd)
1554 idetape_init_pc(pc);
1555 pc->c[0] = START_STOP;
1557 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1558 pc->idetape_callback = &idetape_pc_callback;
1561 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1563 idetape_tape_t *tape = drive->driver_data;
1564 struct ide_atapi_pc pc;
1565 int load_attempted = 0;
1567 /* Wait for the tape to become ready */
1568 set_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags);
1570 while (time_before(jiffies, timeout)) {
1571 idetape_create_test_unit_ready_cmd(&pc);
1572 if (!idetape_queue_pc_tail(drive, &pc))
1574 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1575 || (tape->asc == 0x3A)) {
1579 idetape_create_load_unload_cmd(drive, &pc,
1580 IDETAPE_LU_LOAD_MASK);
1581 idetape_queue_pc_tail(drive, &pc);
1583 /* not about to be ready */
1584 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1585 (tape->ascq == 1 || tape->ascq == 8)))
1592 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1594 struct ide_atapi_pc pc;
1597 idetape_create_write_filemark_cmd(drive, &pc, 0);
1598 rc = idetape_queue_pc_tail(drive, &pc);
1601 idetape_wait_ready(drive, 60 * 5 * HZ);
1605 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1607 idetape_init_pc(pc);
1608 pc->c[0] = READ_POSITION;
1610 pc->idetape_callback = &idetape_read_position_callback;
1613 static int idetape_read_position(ide_drive_t *drive)
1615 idetape_tape_t *tape = drive->driver_data;
1616 struct ide_atapi_pc pc;
1619 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1621 idetape_create_read_position_cmd(&pc);
1622 if (idetape_queue_pc_tail(drive, &pc))
1624 position = tape->first_frame;
1628 static void idetape_create_locate_cmd(ide_drive_t *drive,
1629 struct ide_atapi_pc *pc,
1630 unsigned int block, u8 partition, int skip)
1632 idetape_init_pc(pc);
1633 pc->c[0] = POSITION_TO_ELEMENT;
1635 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1636 pc->c[8] = partition;
1637 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1638 pc->idetape_callback = &idetape_pc_callback;
1641 static int idetape_create_prevent_cmd(ide_drive_t *drive,
1642 struct ide_atapi_pc *pc, int prevent)
1644 idetape_tape_t *tape = drive->driver_data;
1646 /* device supports locking according to capabilities page */
1647 if (!(tape->caps[6] & 0x01))
1650 idetape_init_pc(pc);
1651 pc->c[0] = ALLOW_MEDIUM_REMOVAL;
1653 pc->idetape_callback = &idetape_pc_callback;
1657 static int __idetape_discard_read_pipeline(ide_drive_t *drive)
1659 idetape_tape_t *tape = drive->driver_data;
1661 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1664 clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags);
1665 tape->merge_stage_size = 0;
1666 if (tape->merge_stage != NULL) {
1667 __idetape_kfree_stage(tape->merge_stage);
1668 tape->merge_stage = NULL;
1671 tape->chrdev_dir = IDETAPE_DIR_NONE;
1677 * Position the tape to the requested block using the LOCATE packet command.
1678 * A READ POSITION command is then issued to check where we are positioned. Like
1679 * all higher level operations, we queue the commands at the tail of the request
1680 * queue and wait for their completion.
1682 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1683 u8 partition, int skip)
1685 idetape_tape_t *tape = drive->driver_data;
1687 struct ide_atapi_pc pc;
1689 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1690 __idetape_discard_read_pipeline(drive);
1691 idetape_wait_ready(drive, 60 * 5 * HZ);
1692 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1693 retval = idetape_queue_pc_tail(drive, &pc);
1697 idetape_create_read_position_cmd(&pc);
1698 return (idetape_queue_pc_tail(drive, &pc));
1701 static void idetape_discard_read_pipeline(ide_drive_t *drive,
1702 int restore_position)
1704 idetape_tape_t *tape = drive->driver_data;
1708 cnt = __idetape_discard_read_pipeline(drive);
1709 if (restore_position) {
1710 position = idetape_read_position(drive);
1711 seek = position > cnt ? position - cnt : 0;
1712 if (idetape_position_tape(drive, seek, 0, 0)) {
1713 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1714 " discard_pipeline()\n", tape->name);
1721 * Generate a read/write request for the block device interface and wait for it
1724 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1725 struct idetape_bh *bh)
1727 idetape_tape_t *tape = drive->driver_data;
1730 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1732 idetape_init_rq(&rq, cmd);
1733 rq.rq_disk = tape->disk;
1734 rq.special = (void *)bh;
1735 rq.sector = tape->first_frame;
1736 rq.nr_sectors = blocks;
1737 rq.current_nr_sectors = blocks;
1738 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1740 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1743 if (tape->merge_stage)
1744 idetape_init_merge_stage(tape);
1745 if (rq.errors == IDETAPE_ERROR_GENERAL)
1747 return (tape->blk_size * (blocks-rq.current_nr_sectors));
1750 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1752 idetape_init_pc(pc);
1756 pc->idetape_callback = &idetape_pc_callback;
1759 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1760 struct ide_atapi_pc *pc)
1762 idetape_init_pc(pc);
1763 pc->c[0] = REZERO_UNIT;
1764 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1765 pc->idetape_callback = &idetape_pc_callback;
1768 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1770 idetape_init_pc(pc);
1773 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1774 pc->idetape_callback = &idetape_pc_callback;
1777 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1779 idetape_init_pc(pc);
1781 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1783 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1784 pc->idetape_callback = &idetape_pc_callback;
1787 /* Queue up a character device originated write request. */
1788 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1790 idetape_tape_t *tape = drive->driver_data;
1792 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1794 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1795 blocks, tape->merge_stage->bh);
1798 static void idetape_empty_write_pipeline(ide_drive_t *drive)
1800 idetape_tape_t *tape = drive->driver_data;
1802 struct idetape_bh *bh;
1804 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1805 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline,"
1806 " but we are not writing.\n");
1809 if (tape->merge_stage_size > tape->stage_size) {
1810 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1811 tape->merge_stage_size = tape->stage_size;
1813 if (tape->merge_stage_size) {
1814 blocks = tape->merge_stage_size / tape->blk_size;
1815 if (tape->merge_stage_size % tape->blk_size) {
1819 i = tape->blk_size - tape->merge_stage_size %
1821 bh = tape->bh->b_reqnext;
1823 atomic_set(&bh->b_count, 0);
1829 printk(KERN_INFO "ide-tape: bug,"
1833 min = min(i, (unsigned int)(bh->b_size -
1834 atomic_read(&bh->b_count)));
1835 memset(bh->b_data + atomic_read(&bh->b_count),
1837 atomic_add(min, &bh->b_count);
1842 (void) idetape_add_chrdev_write_request(drive, blocks);
1843 tape->merge_stage_size = 0;
1845 if (tape->merge_stage != NULL) {
1846 __idetape_kfree_stage(tape->merge_stage);
1847 tape->merge_stage = NULL;
1849 tape->chrdev_dir = IDETAPE_DIR_NONE;
1852 static int idetape_init_read(ide_drive_t *drive)
1854 idetape_tape_t *tape = drive->driver_data;
1857 /* Initialize read operation */
1858 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1859 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1860 idetape_empty_write_pipeline(drive);
1861 idetape_flush_tape_buffers(drive);
1863 if (tape->merge_stage || tape->merge_stage_size) {
1864 printk(KERN_ERR "ide-tape: merge_stage_size should be"
1866 tape->merge_stage_size = 0;
1868 tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0);
1869 if (!tape->merge_stage)
1871 tape->chrdev_dir = IDETAPE_DIR_READ;
1874 * Issue a read 0 command to ensure that DSC handshake is
1875 * switched from completion mode to buffer available mode.
1876 * No point in issuing this if DSC overlap isn't supported, some
1877 * drives (Seagate STT3401A) will return an error.
1879 if (drive->dsc_overlap) {
1880 bytes_read = idetape_queue_rw_tail(drive,
1881 REQ_IDETAPE_READ, 0,
1882 tape->merge_stage->bh);
1883 if (bytes_read < 0) {
1884 __idetape_kfree_stage(tape->merge_stage);
1885 tape->merge_stage = NULL;
1886 tape->chrdev_dir = IDETAPE_DIR_NONE;
1896 * Called from idetape_chrdev_read() to service a character device read request
1897 * and add read-ahead requests to our pipeline.
1899 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1901 idetape_tape_t *tape = drive->driver_data;
1903 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1905 /* If we are at a filemark, return a read length of 0 */
1906 if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
1909 idetape_init_read(drive);
1911 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1912 tape->merge_stage->bh);
1915 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1917 idetape_tape_t *tape = drive->driver_data;
1918 struct idetape_bh *bh;
1924 bh = tape->merge_stage->bh;
1925 count = min(tape->stage_size, bcount);
1927 blocks = count / tape->blk_size;
1929 atomic_set(&bh->b_count,
1930 min(count, (unsigned int)bh->b_size));
1931 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1932 count -= atomic_read(&bh->b_count);
1935 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1936 tape->merge_stage->bh);
1941 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1942 * currently support only one partition.
1944 static int idetape_rewind_tape(ide_drive_t *drive)
1947 struct ide_atapi_pc pc;
1948 idetape_tape_t *tape;
1949 tape = drive->driver_data;
1951 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1953 idetape_create_rewind_cmd(drive, &pc);
1954 retval = idetape_queue_pc_tail(drive, &pc);
1958 idetape_create_read_position_cmd(&pc);
1959 retval = idetape_queue_pc_tail(drive, &pc);
1965 /* mtio.h compatible commands should be issued to the chrdev interface. */
1966 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1969 idetape_tape_t *tape = drive->driver_data;
1970 void __user *argp = (void __user *)arg;
1972 struct idetape_config {
1973 int dsc_rw_frequency;
1974 int dsc_media_access_frequency;
1978 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1982 if (copy_from_user(&config, argp, sizeof(config)))
1984 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1987 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1988 config.nr_stages = 1;
1989 if (copy_to_user(argp, &config, sizeof(config)))
1998 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
2001 idetape_tape_t *tape = drive->driver_data;
2002 struct ide_atapi_pc pc;
2003 int retval, count = 0;
2004 int sprev = !!(tape->caps[4] & 0x20);
2008 if (MTBSF == mt_op || MTBSFM == mt_op) {
2011 mt_count = -mt_count;
2014 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2015 tape->merge_stage_size = 0;
2016 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
2018 idetape_discard_read_pipeline(drive, 0);
2022 * The filemark was not found in our internal pipeline; now we can issue
2023 * the space command.
2028 idetape_create_space_cmd(&pc, mt_count - count,
2029 IDETAPE_SPACE_OVER_FILEMARK);
2030 return idetape_queue_pc_tail(drive, &pc);
2035 retval = idetape_space_over_filemarks(drive, MTFSF,
2039 count = (MTBSFM == mt_op ? 1 : -1);
2040 return idetape_space_over_filemarks(drive, MTFSF, count);
2042 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
2049 * Our character device read / write functions.
2051 * The tape is optimized to maximize throughput when it is transferring an
2052 * integral number of the "continuous transfer limit", which is a parameter of
2053 * the specific tape (26kB on my particular tape, 32kB for Onstream).
2055 * As of version 1.3 of the driver, the character device provides an abstract
2056 * continuous view of the media - any mix of block sizes (even 1 byte) on the
2057 * same backup/restore procedure is supported. The driver will internally
2058 * convert the requests to the recommended transfer unit, so that an unmatch
2059 * between the user's block size to the recommended size will only result in a
2060 * (slightly) increased driver overhead, but will no longer hit performance.
2061 * This is not applicable to Onstream.
2063 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
2064 size_t count, loff_t *ppos)
2066 struct ide_tape_obj *tape = ide_tape_f(file);
2067 ide_drive_t *drive = tape->drive;
2068 ssize_t bytes_read, temp, actually_read = 0, rc;
2070 u16 ctl = *(u16 *)&tape->caps[12];
2072 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
2074 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
2075 if (test_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags))
2076 if (count > tape->blk_size &&
2077 (count % tape->blk_size) == 0)
2078 tape->user_bs_factor = count / tape->blk_size;
2080 rc = idetape_init_read(drive);
2085 if (tape->merge_stage_size) {
2086 actually_read = min((unsigned int)(tape->merge_stage_size),
2087 (unsigned int)count);
2088 if (idetape_copy_stage_to_user(tape, buf, actually_read))
2090 buf += actually_read;
2091 tape->merge_stage_size -= actually_read;
2092 count -= actually_read;
2094 while (count >= tape->stage_size) {
2095 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
2096 if (bytes_read <= 0)
2098 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
2101 count -= bytes_read;
2102 actually_read += bytes_read;
2105 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
2106 if (bytes_read <= 0)
2108 temp = min((unsigned long)count, (unsigned long)bytes_read);
2109 if (idetape_copy_stage_to_user(tape, buf, temp))
2111 actually_read += temp;
2112 tape->merge_stage_size = bytes_read-temp;
2115 if (!actually_read && test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) {
2116 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
2118 idetape_space_over_filemarks(drive, MTFSF, 1);
2122 return ret ? ret : actually_read;
2125 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
2126 size_t count, loff_t *ppos)
2128 struct ide_tape_obj *tape = ide_tape_f(file);
2129 ide_drive_t *drive = tape->drive;
2130 ssize_t actually_written = 0;
2132 u16 ctl = *(u16 *)&tape->caps[12];
2134 /* The drive is write protected. */
2135 if (tape->write_prot)
2138 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
2140 /* Initialize write operation */
2141 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
2142 if (tape->chrdev_dir == IDETAPE_DIR_READ)
2143 idetape_discard_read_pipeline(drive, 1);
2144 if (tape->merge_stage || tape->merge_stage_size) {
2145 printk(KERN_ERR "ide-tape: merge_stage_size "
2146 "should be 0 now\n");
2147 tape->merge_stage_size = 0;
2149 tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0);
2150 if (!tape->merge_stage)
2152 tape->chrdev_dir = IDETAPE_DIR_WRITE;
2153 idetape_init_merge_stage(tape);
2156 * Issue a write 0 command to ensure that DSC handshake is
2157 * switched from completion mode to buffer available mode. No
2158 * point in issuing this if DSC overlap isn't supported, some
2159 * drives (Seagate STT3401A) will return an error.
2161 if (drive->dsc_overlap) {
2162 ssize_t retval = idetape_queue_rw_tail(drive,
2163 REQ_IDETAPE_WRITE, 0,
2164 tape->merge_stage->bh);
2166 __idetape_kfree_stage(tape->merge_stage);
2167 tape->merge_stage = NULL;
2168 tape->chrdev_dir = IDETAPE_DIR_NONE;
2175 if (tape->merge_stage_size) {
2176 if (tape->merge_stage_size >= tape->stage_size) {
2177 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
2178 tape->merge_stage_size = 0;
2180 actually_written = min((unsigned int)
2181 (tape->stage_size - tape->merge_stage_size),
2182 (unsigned int)count);
2183 if (idetape_copy_stage_from_user(tape, buf, actually_written))
2185 buf += actually_written;
2186 tape->merge_stage_size += actually_written;
2187 count -= actually_written;
2189 if (tape->merge_stage_size == tape->stage_size) {
2191 tape->merge_stage_size = 0;
2192 retval = idetape_add_chrdev_write_request(drive, ctl);
2197 while (count >= tape->stage_size) {
2199 if (idetape_copy_stage_from_user(tape, buf, tape->stage_size))
2201 buf += tape->stage_size;
2202 count -= tape->stage_size;
2203 retval = idetape_add_chrdev_write_request(drive, ctl);
2204 actually_written += tape->stage_size;
2209 actually_written += count;
2210 if (idetape_copy_stage_from_user(tape, buf, count))
2212 tape->merge_stage_size += count;
2214 return ret ? ret : actually_written;
2217 static int idetape_write_filemark(ide_drive_t *drive)
2219 struct ide_atapi_pc pc;
2221 /* Write a filemark */
2222 idetape_create_write_filemark_cmd(drive, &pc, 1);
2223 if (idetape_queue_pc_tail(drive, &pc)) {
2224 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
2231 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
2234 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
2235 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
2236 * usually not supported (it is supported in the rare case in which we crossed
2237 * the filemark during our read-ahead pipelined operation mode).
2239 * The following commands are currently not supported:
2241 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
2242 * MT_ST_WRITE_THRESHOLD.
2244 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
2246 idetape_tape_t *tape = drive->driver_data;
2247 struct ide_atapi_pc pc;
2250 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
2253 /* Commands which need our pipelined read-ahead stages. */
2261 return idetape_space_over_filemarks(drive, mt_op, mt_count);
2268 if (tape->write_prot)
2270 idetape_discard_read_pipeline(drive, 1);
2271 for (i = 0; i < mt_count; i++) {
2272 retval = idetape_write_filemark(drive);
2278 idetape_discard_read_pipeline(drive, 0);
2279 if (idetape_rewind_tape(drive))
2283 idetape_discard_read_pipeline(drive, 0);
2284 idetape_create_load_unload_cmd(drive, &pc,
2285 IDETAPE_LU_LOAD_MASK);
2286 return idetape_queue_pc_tail(drive, &pc);
2290 * If door is locked, attempt to unlock before
2291 * attempting to eject.
2293 if (tape->door_locked) {
2294 if (idetape_create_prevent_cmd(drive, &pc, 0))
2295 if (!idetape_queue_pc_tail(drive, &pc))
2296 tape->door_locked = DOOR_UNLOCKED;
2298 idetape_discard_read_pipeline(drive, 0);
2299 idetape_create_load_unload_cmd(drive, &pc,
2300 !IDETAPE_LU_LOAD_MASK);
2301 retval = idetape_queue_pc_tail(drive, &pc);
2303 clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags);
2306 idetape_discard_read_pipeline(drive, 0);
2307 return idetape_flush_tape_buffers(drive);
2309 idetape_discard_read_pipeline(drive, 0);
2310 idetape_create_load_unload_cmd(drive, &pc,
2311 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
2312 return idetape_queue_pc_tail(drive, &pc);
2314 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
2315 return idetape_queue_pc_tail(drive, &pc);
2317 (void)idetape_rewind_tape(drive);
2318 idetape_create_erase_cmd(&pc);
2319 return idetape_queue_pc_tail(drive, &pc);
2322 if (mt_count < tape->blk_size ||
2323 mt_count % tape->blk_size)
2325 tape->user_bs_factor = mt_count / tape->blk_size;
2326 clear_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags);
2328 set_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags);
2331 idetape_discard_read_pipeline(drive, 0);
2332 return idetape_position_tape(drive,
2333 mt_count * tape->user_bs_factor, tape->partition, 0);
2335 idetape_discard_read_pipeline(drive, 0);
2336 return idetape_position_tape(drive, 0, mt_count, 0);
2340 if (!idetape_create_prevent_cmd(drive, &pc, 1))
2342 retval = idetape_queue_pc_tail(drive, &pc);
2345 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
2348 if (!idetape_create_prevent_cmd(drive, &pc, 0))
2350 retval = idetape_queue_pc_tail(drive, &pc);
2353 tape->door_locked = DOOR_UNLOCKED;
2356 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
2363 * Our character device ioctls. General mtio.h magnetic io commands are
2364 * supported here, and not in the corresponding block interface. Our own
2365 * ide-tape ioctls are supported on both interfaces.
2367 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
2368 unsigned int cmd, unsigned long arg)
2370 struct ide_tape_obj *tape = ide_tape_f(file);
2371 ide_drive_t *drive = tape->drive;
2375 int block_offset = 0, position = tape->first_frame;
2376 void __user *argp = (void __user *)arg;
2378 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
2380 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
2381 idetape_empty_write_pipeline(drive);
2382 idetape_flush_tape_buffers(drive);
2384 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
2385 block_offset = tape->merge_stage_size /
2386 (tape->blk_size * tape->user_bs_factor);
2387 position = idetape_read_position(drive);
2393 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
2395 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
2397 memset(&mtget, 0, sizeof(struct mtget));
2398 mtget.mt_type = MT_ISSCSI2;
2399 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
2401 ((tape->blk_size * tape->user_bs_factor)
2402 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
2404 if (tape->drv_write_prot)
2405 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
2407 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
2411 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
2412 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
2416 if (tape->chrdev_dir == IDETAPE_DIR_READ)
2417 idetape_discard_read_pipeline(drive, 1);
2418 return idetape_blkdev_ioctl(drive, cmd, arg);
2423 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
2424 * block size with the reported value.
2426 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
2428 idetape_tape_t *tape = drive->driver_data;
2429 struct ide_atapi_pc pc;
2431 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
2432 if (idetape_queue_pc_tail(drive, &pc)) {
2433 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
2434 if (tape->blk_size == 0) {
2435 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
2436 "block size, assuming 32k\n");
2437 tape->blk_size = 32768;
2441 tape->blk_size = (pc.buf[4 + 5] << 16) +
2442 (pc.buf[4 + 6] << 8) +
2444 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
2447 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
2449 unsigned int minor = iminor(inode), i = minor & ~0xc0;
2451 idetape_tape_t *tape;
2452 struct ide_atapi_pc pc;
2455 if (i >= MAX_HWIFS * MAX_DRIVES)
2458 tape = ide_tape_chrdev_get(i);
2462 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2465 * We really want to do nonseekable_open(inode, filp); here, but some
2466 * versions of tar incorrectly call lseek on tapes and bail out if that
2467 * fails. So we disallow pread() and pwrite(), but permit lseeks.
2469 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
2471 drive = tape->drive;
2473 filp->private_data = tape;
2475 if (test_and_set_bit(IDETAPE_FLAG_BUSY, &tape->flags)) {
2480 retval = idetape_wait_ready(drive, 60 * HZ);
2482 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
2483 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
2487 idetape_read_position(drive);
2488 if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags))
2489 (void)idetape_rewind_tape(drive);
2491 /* Read block size and write protect status from drive. */
2492 ide_tape_get_bsize_from_bdesc(drive);
2494 /* Set write protect flag if device is opened as read-only. */
2495 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
2496 tape->write_prot = 1;
2498 tape->write_prot = tape->drv_write_prot;
2500 /* Make sure drive isn't write protected if user wants to write. */
2501 if (tape->write_prot) {
2502 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
2503 (filp->f_flags & O_ACCMODE) == O_RDWR) {
2504 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
2510 /* Lock the tape drive door so user can't eject. */
2511 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2512 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
2513 if (!idetape_queue_pc_tail(drive, &pc)) {
2514 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
2515 tape->door_locked = DOOR_LOCKED;
2526 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
2528 idetape_tape_t *tape = drive->driver_data;
2530 idetape_empty_write_pipeline(drive);
2531 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
2532 if (tape->merge_stage != NULL) {
2533 idetape_pad_zeros(drive, tape->blk_size *
2534 (tape->user_bs_factor - 1));
2535 __idetape_kfree_stage(tape->merge_stage);
2536 tape->merge_stage = NULL;
2538 idetape_write_filemark(drive);
2539 idetape_flush_tape_buffers(drive);
2540 idetape_flush_tape_buffers(drive);
2543 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
2545 struct ide_tape_obj *tape = ide_tape_f(filp);
2546 ide_drive_t *drive = tape->drive;
2547 struct ide_atapi_pc pc;
2548 unsigned int minor = iminor(inode);
2551 tape = drive->driver_data;
2553 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2555 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2556 idetape_write_release(drive, minor);
2557 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2559 idetape_discard_read_pipeline(drive, 1);
2562 if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags))
2563 (void) idetape_rewind_tape(drive);
2564 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2565 if (tape->door_locked == DOOR_LOCKED) {
2566 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
2567 if (!idetape_queue_pc_tail(drive, &pc))
2568 tape->door_locked = DOOR_UNLOCKED;
2572 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
2579 * check the contents of the ATAPI IDENTIFY command results. We return:
2581 * 1 - If the tape can be supported by us, based on the information we have so
2584 * 0 - If this tape driver is not currently supported by us.
2586 static int idetape_identify_device(ide_drive_t *drive)
2588 u8 gcw[2], protocol, device_type, removable, packet_size;
2590 if (drive->id_read == 0)
2593 *((unsigned short *) &gcw) = drive->id->config;
2595 protocol = (gcw[1] & 0xC0) >> 6;
2596 device_type = gcw[1] & 0x1F;
2597 removable = !!(gcw[0] & 0x80);
2598 packet_size = gcw[0] & 0x3;
2600 /* Check that we can support this device */
2602 printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n",
2604 else if (device_type != 1)
2605 printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set "
2606 "to tape\n", device_type);
2607 else if (!removable)
2608 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
2609 else if (packet_size != 0) {
2610 printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12"
2611 " bytes\n", packet_size);
2617 static void idetape_get_inquiry_results(ide_drive_t *drive)
2619 idetape_tape_t *tape = drive->driver_data;
2620 struct ide_atapi_pc pc;
2621 char fw_rev[6], vendor_id[10], product_id[18];
2623 idetape_create_inquiry_cmd(&pc);
2624 if (idetape_queue_pc_tail(drive, &pc)) {
2625 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2629 memcpy(vendor_id, &pc.buf[8], 8);
2630 memcpy(product_id, &pc.buf[16], 16);
2631 memcpy(fw_rev, &pc.buf[32], 4);
2633 ide_fixstring(vendor_id, 10, 0);
2634 ide_fixstring(product_id, 18, 0);
2635 ide_fixstring(fw_rev, 6, 0);
2637 printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n",
2638 drive->name, tape->name, vendor_id, product_id, fw_rev);
2642 * Ask the tape about its various parameters. In particular, we will adjust our
2643 * data transfer buffer size to the recommended value as returned by the tape.
2645 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2647 idetape_tape_t *tape = drive->driver_data;
2648 struct ide_atapi_pc pc;
2650 u8 speed, max_speed;
2652 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2653 if (idetape_queue_pc_tail(drive, &pc)) {
2654 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2655 " some default values\n");
2656 tape->blk_size = 512;
2657 put_unaligned(52, (u16 *)&tape->caps[12]);
2658 put_unaligned(540, (u16 *)&tape->caps[14]);
2659 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2662 caps = pc.buf + 4 + pc.buf[3];
2664 /* convert to host order and save for later use */
2665 speed = be16_to_cpu(*(u16 *)&caps[14]);
2666 max_speed = be16_to_cpu(*(u16 *)&caps[8]);
2668 put_unaligned(max_speed, (u16 *)&caps[8]);
2669 put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]);
2670 put_unaligned(speed, (u16 *)&caps[14]);
2671 put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]);
2674 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2675 "(assuming 650KB/sec)\n", drive->name);
2676 put_unaligned(650, (u16 *)&caps[14]);
2679 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2680 "(assuming 650KB/sec)\n", drive->name);
2681 put_unaligned(650, (u16 *)&caps[8]);
2684 memcpy(&tape->caps, caps, 20);
2686 tape->blk_size = 512;
2687 else if (caps[7] & 0x04)
2688 tape->blk_size = 1024;
2691 #ifdef CONFIG_IDE_PROC_FS
2692 static void idetape_add_settings(ide_drive_t *drive)
2694 idetape_tape_t *tape = drive->driver_data;
2696 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
2697 1, 2, (u16 *)&tape->caps[16], NULL);
2698 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
2699 1, 1, (u16 *)&tape->caps[14], NULL);
2700 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1,
2701 1024, &tape->stage_size, NULL);
2702 ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN,
2703 IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq,
2705 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1,
2706 1, &drive->dsc_overlap, NULL);
2707 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff,
2708 1, 1, &tape->avg_speed, NULL);
2709 ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1,
2710 1, &tape->debug_mask, NULL);
2713 static inline void idetape_add_settings(ide_drive_t *drive) { ; }
2717 * The function below is called to:
2719 * 1. Initialize our various state variables.
2720 * 2. Ask the tape for its capabilities.
2721 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2722 * is chosen based on the recommendation which we received in step 2.
2724 * Note that at this point ide.c already assigned us an irq, so that we can
2725 * queue requests here and wait for their completion.
2727 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2733 u16 *ctl = (u16 *)&tape->caps[12];
2735 spin_lock_init(&tape->lock);
2736 drive->dsc_overlap = 1;
2737 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2738 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2740 drive->dsc_overlap = 0;
2742 /* Seagate Travan drives do not support DSC overlap. */
2743 if (strstr(drive->id->model, "Seagate STT3401"))
2744 drive->dsc_overlap = 0;
2745 tape->minor = minor;
2746 tape->name[0] = 'h';
2747 tape->name[1] = 't';
2748 tape->name[2] = '0' + minor;
2749 tape->chrdev_dir = IDETAPE_DIR_NONE;
2750 tape->pc = tape->pc_stack;
2751 *((unsigned short *) &gcw) = drive->id->config;
2753 /* Command packet DRQ type */
2754 if (((gcw[0] & 0x60) >> 5) == 1)
2755 set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags);
2757 idetape_get_inquiry_results(drive);
2758 idetape_get_mode_sense_results(drive);
2759 ide_tape_get_bsize_from_bdesc(drive);
2760 tape->user_bs_factor = 1;
2761 tape->stage_size = *ctl * tape->blk_size;
2762 while (tape->stage_size > 0xffff) {
2763 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2765 tape->stage_size = *ctl * tape->blk_size;
2767 stage_size = tape->stage_size;
2768 tape->pages_per_stage = stage_size / PAGE_SIZE;
2769 if (stage_size % PAGE_SIZE) {
2770 tape->pages_per_stage++;
2771 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
2774 /* select the "best" DSC read/write polling freq */
2775 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2777 t = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
2780 * Ensure that the number we got makes sense; limit it within
2781 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2783 tape->best_dsc_rw_freq = max_t(unsigned long,
2784 min_t(unsigned long, t, IDETAPE_DSC_RW_MAX),
2785 IDETAPE_DSC_RW_MIN);
2786 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2788 drive->name, tape->name, *(u16 *)&tape->caps[14],
2789 (*(u16 *)&tape->caps[16] * 512) / tape->stage_size,
2790 tape->stage_size / 1024,
2791 tape->best_dsc_rw_freq * 1000 / HZ,
2792 drive->using_dma ? ", DMA":"");
2794 idetape_add_settings(drive);
2797 static void ide_tape_remove(ide_drive_t *drive)
2799 idetape_tape_t *tape = drive->driver_data;
2801 ide_proc_unregister_driver(drive, tape->driver);
2803 ide_unregister_region(tape->disk);
2808 static void ide_tape_release(struct kref *kref)
2810 struct ide_tape_obj *tape = to_ide_tape(kref);
2811 ide_drive_t *drive = tape->drive;
2812 struct gendisk *g = tape->disk;
2814 BUG_ON(tape->merge_stage_size);
2816 drive->dsc_overlap = 0;
2817 drive->driver_data = NULL;
2818 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2819 device_destroy(idetape_sysfs_class,
2820 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2821 idetape_devs[tape->minor] = NULL;
2822 g->private_data = NULL;
2827 #ifdef CONFIG_IDE_PROC_FS
2828 static int proc_idetape_read_name
2829 (char *page, char **start, off_t off, int count, int *eof, void *data)
2831 ide_drive_t *drive = (ide_drive_t *) data;
2832 idetape_tape_t *tape = drive->driver_data;
2836 len = sprintf(out, "%s\n", tape->name);
2837 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2840 static ide_proc_entry_t idetape_proc[] = {
2841 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2842 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2843 { NULL, 0, NULL, NULL }
2847 static int ide_tape_probe(ide_drive_t *);
2849 static ide_driver_t idetape_driver = {
2851 .owner = THIS_MODULE,
2853 .bus = &ide_bus_type,
2855 .probe = ide_tape_probe,
2856 .remove = ide_tape_remove,
2857 .version = IDETAPE_VERSION,
2859 .supports_dsc_overlap = 1,
2860 .do_request = idetape_do_request,
2861 .end_request = idetape_end_request,
2862 .error = __ide_error,
2863 .abort = __ide_abort,
2864 #ifdef CONFIG_IDE_PROC_FS
2865 .proc = idetape_proc,
2869 /* Our character device supporting functions, passed to register_chrdev. */
2870 static const struct file_operations idetape_fops = {
2871 .owner = THIS_MODULE,
2872 .read = idetape_chrdev_read,
2873 .write = idetape_chrdev_write,
2874 .ioctl = idetape_chrdev_ioctl,
2875 .open = idetape_chrdev_open,
2876 .release = idetape_chrdev_release,
2879 static int idetape_open(struct inode *inode, struct file *filp)
2881 struct gendisk *disk = inode->i_bdev->bd_disk;
2882 struct ide_tape_obj *tape;
2884 tape = ide_tape_get(disk);
2891 static int idetape_release(struct inode *inode, struct file *filp)
2893 struct gendisk *disk = inode->i_bdev->bd_disk;
2894 struct ide_tape_obj *tape = ide_tape_g(disk);
2901 static int idetape_ioctl(struct inode *inode, struct file *file,
2902 unsigned int cmd, unsigned long arg)
2904 struct block_device *bdev = inode->i_bdev;
2905 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
2906 ide_drive_t *drive = tape->drive;
2907 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2909 err = idetape_blkdev_ioctl(drive, cmd, arg);
2913 static struct block_device_operations idetape_block_ops = {
2914 .owner = THIS_MODULE,
2915 .open = idetape_open,
2916 .release = idetape_release,
2917 .ioctl = idetape_ioctl,
2920 static int ide_tape_probe(ide_drive_t *drive)
2922 idetape_tape_t *tape;
2926 if (!strstr("ide-tape", drive->driver_req))
2928 if (!drive->present)
2930 if (drive->media != ide_tape)
2932 if (!idetape_identify_device(drive)) {
2933 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2934 " the driver\n", drive->name);
2938 printk(KERN_INFO "ide-tape: passing drive %s to ide-scsi"
2939 " emulation.\n", drive->name);
2942 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2944 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2949 g = alloc_disk(1 << PARTN_BITS);
2953 ide_init_disk(g, drive);
2955 ide_proc_register_driver(drive, &idetape_driver);
2957 kref_init(&tape->kref);
2959 tape->drive = drive;
2960 tape->driver = &idetape_driver;
2963 g->private_data = &tape->driver;
2965 drive->driver_data = tape;
2967 mutex_lock(&idetape_ref_mutex);
2968 for (minor = 0; idetape_devs[minor]; minor++)
2970 idetape_devs[minor] = tape;
2971 mutex_unlock(&idetape_ref_mutex);
2973 idetape_setup(drive, tape, minor);
2975 device_create(idetape_sysfs_class, &drive->gendev,
2976 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name);
2977 device_create(idetape_sysfs_class, &drive->gendev,
2978 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name);
2980 g->fops = &idetape_block_ops;
2981 ide_register_region(g);
2991 static void __exit idetape_exit(void)
2993 driver_unregister(&idetape_driver.gen_driver);
2994 class_destroy(idetape_sysfs_class);
2995 unregister_chrdev(IDETAPE_MAJOR, "ht");
2998 static int __init idetape_init(void)
3001 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
3002 if (IS_ERR(idetape_sysfs_class)) {
3003 idetape_sysfs_class = NULL;
3004 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
3009 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
3010 printk(KERN_ERR "ide-tape: Failed to register chrdev"
3013 goto out_free_class;
3016 error = driver_register(&idetape_driver.gen_driver);
3018 goto out_free_driver;
3023 driver_unregister(&idetape_driver.gen_driver);
3025 class_destroy(idetape_sysfs_class);
3030 MODULE_ALIAS("ide:*m-tape*");
3031 module_init(idetape_init);
3032 module_exit(idetape_exit);
3033 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
3034 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
3035 MODULE_LICENSE("GPL");