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 *****************************/
76 * After each failed packet command we issue a request sense command and retry
77 * the packet command IDETAPE_MAX_PC_RETRIES times.
79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
81 #define IDETAPE_MAX_PC_RETRIES 3
84 * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE
85 * bytes. This is used for several packet commands (Not for READ/WRITE commands)
87 #define IDETAPE_PC_BUFFER_SIZE 256
90 * In various places in the driver, we need to allocate storage
91 * for packet commands and requests, which will remain valid while
92 * we leave the driver to wait for an interrupt or a timeout event.
94 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
97 * Some drives (for example, Seagate STT3401A Travan) require a very long
98 * timeout, because they don't return an interrupt or clear their busy bit
99 * until after the command completes (even retension commands).
101 #define IDETAPE_WAIT_CMD (900*HZ)
104 * The following parameter is used to select the point in the internal tape fifo
105 * in which we will start to refill the buffer. Decreasing the following
106 * parameter will improve the system's latency and interactive response, while
107 * using a high value might improve system throughput.
109 #define IDETAPE_FIFO_THRESHOLD 2
112 * DSC polling parameters.
114 * Polling for DSC (a single bit in the status register) is a very important
115 * function in ide-tape. There are two cases in which we poll for DSC:
117 * 1. Before a read/write packet command, to ensure that we can transfer data
118 * from/to the tape's data buffers, without causing an actual media access.
119 * In case the tape is not ready yet, we take out our request from the device
120 * request queue, so that ide.c could service requests from the other device
121 * on the same interface in the meantime.
123 * 2. After the successful initialization of a "media access packet command",
124 * which is a command that can take a long time to complete (the interval can
125 * range from several seconds to even an hour). Again, we postpone our request
126 * in the middle to free the bus for the other device. The polling frequency
127 * here should be lower than the read/write frequency since those media access
128 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
129 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
130 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
132 * We also set a timeout for the timer, in case something goes wrong. The
133 * timeout should be longer then the maximum execution time of a tape operation.
137 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
138 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
139 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
140 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
141 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
142 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
143 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
145 /*************************** End of tunable parameters ***********************/
147 /* Read/Write error simulation */
148 #define SIMULATE_ERRORS 0
150 /* tape directions */
152 IDETAPE_DIR_NONE
= (1 << 0),
153 IDETAPE_DIR_READ
= (1 << 1),
154 IDETAPE_DIR_WRITE
= (1 << 2),
160 struct idetape_bh
*b_reqnext
;
164 /* Tape door status */
165 #define DOOR_UNLOCKED 0
166 #define DOOR_LOCKED 1
167 #define DOOR_EXPLICITLY_LOCKED 2
169 /* Some defines for the SPACE command */
170 #define IDETAPE_SPACE_OVER_FILEMARK 1
171 #define IDETAPE_SPACE_TO_EOD 3
173 /* Some defines for the LOAD UNLOAD command */
174 #define IDETAPE_LU_LOAD_MASK 1
175 #define IDETAPE_LU_RETENSION_MASK 2
176 #define IDETAPE_LU_EOT_MASK 4
179 * Special requests for our block device strategy routine.
181 * In order to service a character device command, we add special requests to
182 * the tail of our block device request queue and wait for their completion.
186 REQ_IDETAPE_PC1
= (1 << 0), /* packet command (first stage) */
187 REQ_IDETAPE_PC2
= (1 << 1), /* packet command (second stage) */
188 REQ_IDETAPE_READ
= (1 << 2),
189 REQ_IDETAPE_WRITE
= (1 << 3),
192 /* Error codes returned in rq->errors to the higher part of the driver. */
193 #define IDETAPE_ERROR_GENERAL 101
194 #define IDETAPE_ERROR_FILEMARK 102
195 #define IDETAPE_ERROR_EOD 103
197 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
198 #define IDETAPE_BLOCK_DESCRIPTOR 0
199 #define IDETAPE_CAPABILITIES_PAGE 0x2a
201 /* Tape flag bits values. */
203 IDETAPE_FLAG_IGNORE_DSC
= (1 << 0),
204 /* 0 When the tape position is unknown */
205 IDETAPE_FLAG_ADDRESS_VALID
= (1 << 1),
206 /* Device already opened */
207 IDETAPE_FLAG_BUSY
= (1 << 2),
208 /* Attempt to auto-detect the current user block size */
209 IDETAPE_FLAG_DETECT_BS
= (1 << 3),
210 /* Currently on a filemark */
211 IDETAPE_FLAG_FILEMARK
= (1 << 4),
212 /* DRQ interrupt device */
213 IDETAPE_FLAG_DRQ_INTERRUPT
= (1 << 5),
214 /* 0 = no tape is loaded, so we don't rewind after ejecting */
215 IDETAPE_FLAG_MEDIUM_PRESENT
= (1 << 6),
219 * Most of our global data which we need to save even as we leave the driver due
220 * to an interrupt or a timer event is stored in the struct defined below.
222 typedef struct ide_tape_obj
{
224 ide_driver_t
*driver
;
225 struct gendisk
*disk
;
229 * Since a typical character device operation requires more
230 * than one packet command, we provide here enough memory
231 * for the maximum of interconnected packet commands.
232 * The packet commands are stored in the circular array pc_stack.
233 * pc_stack_index points to the last used entry, and warps around
234 * to the start when we get to the last array entry.
236 * pc points to the current processed packet command.
238 * failed_pc points to the last failed packet command, or contains
239 * NULL if we do not need to retry any packet command. This is
240 * required since an additional packet command is needed before the
241 * retry, to get detailed information on what went wrong.
243 /* Current packet command */
244 struct ide_atapi_pc
*pc
;
245 /* Last failed packet command */
246 struct ide_atapi_pc
*failed_pc
;
247 /* Packet command stack */
248 struct ide_atapi_pc pc_stack
[IDETAPE_PC_STACK
];
249 /* Next free packet command storage space */
251 struct request rq_stack
[IDETAPE_PC_STACK
];
252 /* We implement a circular array */
256 * DSC polling variables.
258 * While polling for DSC we use postponed_rq to postpone the current
259 * request so that ide.c will be able to service pending requests on the
260 * other device. Note that at most we will have only one DSC (usually
261 * data transfer) request in the device request queue.
263 struct request
*postponed_rq
;
264 /* The time in which we started polling for DSC */
265 unsigned long dsc_polling_start
;
266 /* Timer used to poll for dsc */
267 struct timer_list dsc_timer
;
268 /* Read/Write dsc polling frequency */
269 unsigned long best_dsc_rw_freq
;
270 unsigned long dsc_poll_freq
;
271 unsigned long dsc_timeout
;
273 /* Read position information */
276 unsigned int first_frame
;
278 /* Last error information */
279 u8 sense_key
, asc
, ascq
;
281 /* Character device operation */
285 /* Current character device data transfer direction */
288 /* tape block size, usually 512 or 1024 bytes */
289 unsigned short blk_size
;
292 /* Copy of the tape's Capabilities and Mechanical Page */
296 * Active data transfer request parameters.
298 * At most, there is only one ide-tape originated data transfer request
299 * in the device request queue. This allows ide.c to easily service
300 * requests from the other device when we postpone our active request.
303 /* Data buffer size chosen based on the tape's recommendation */
306 struct idetape_bh
*merge_bh
;
307 /* size of the merge buffer */
309 /* pointer to current buffer head within the merge buffer */
310 struct idetape_bh
*bh
;
314 int pages_per_buffer
;
315 /* Wasted space in each stage */
318 /* Status/Action flags: long for set_bit */
320 /* protects the ide-tape queue */
323 /* Measures average tape speed */
324 unsigned long avg_time
;
328 /* the door is currently locked */
330 /* the tape hardware is write protected */
332 /* the tape is write protected (hardware or opened as read-only) */
338 static DEFINE_MUTEX(idetape_ref_mutex
);
340 static struct class *idetape_sysfs_class
;
342 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
344 #define ide_tape_g(disk) \
345 container_of((disk)->private_data, struct ide_tape_obj, driver)
347 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
349 struct ide_tape_obj
*tape
= NULL
;
351 mutex_lock(&idetape_ref_mutex
);
352 tape
= ide_tape_g(disk
);
354 kref_get(&tape
->kref
);
355 mutex_unlock(&idetape_ref_mutex
);
359 static void ide_tape_release(struct kref
*);
361 static void ide_tape_put(struct ide_tape_obj
*tape
)
363 mutex_lock(&idetape_ref_mutex
);
364 kref_put(&tape
->kref
, ide_tape_release
);
365 mutex_unlock(&idetape_ref_mutex
);
369 * The variables below are used for the character device interface. Additional
370 * state variables are defined in our ide_drive_t structure.
372 static struct ide_tape_obj
*idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
374 #define ide_tape_f(file) ((file)->private_data)
376 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
378 struct ide_tape_obj
*tape
= NULL
;
380 mutex_lock(&idetape_ref_mutex
);
381 tape
= idetape_devs
[i
];
383 kref_get(&tape
->kref
);
384 mutex_unlock(&idetape_ref_mutex
);
388 static void idetape_input_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
391 struct idetape_bh
*bh
= pc
->bh
;
396 printk(KERN_ERR
"ide-tape: bh == NULL in "
397 "idetape_input_buffers\n");
398 ide_pad_transfer(drive
, 0, bcount
);
402 (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)),
404 drive
->hwif
->input_data(drive
, NULL
, bh
->b_data
+
405 atomic_read(&bh
->b_count
), count
);
407 atomic_add(count
, &bh
->b_count
);
408 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
411 atomic_set(&bh
->b_count
, 0);
417 static void idetape_output_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
420 struct idetape_bh
*bh
= pc
->bh
;
425 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
429 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
430 drive
->hwif
->output_data(drive
, NULL
, pc
->b_data
, count
);
433 pc
->b_count
-= count
;
438 pc
->b_data
= bh
->b_data
;
439 pc
->b_count
= atomic_read(&bh
->b_count
);
445 static void idetape_update_buffers(struct ide_atapi_pc
*pc
)
447 struct idetape_bh
*bh
= pc
->bh
;
449 unsigned int bcount
= pc
->xferred
;
451 if (pc
->flags
& PC_FLAG_WRITING
)
455 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
459 count
= min((unsigned int)bh
->b_size
, (unsigned int)bcount
);
460 atomic_set(&bh
->b_count
, count
);
461 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
469 * idetape_next_pc_storage returns a pointer to a place in which we can
470 * safely store a packet command, even though we intend to leave the
471 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
472 * commands is allocated at initialization time.
474 static struct ide_atapi_pc
*idetape_next_pc_storage(ide_drive_t
*drive
)
476 idetape_tape_t
*tape
= drive
->driver_data
;
478 debug_log(DBG_PCRQ_STACK
, "pc_stack_index=%d\n", tape
->pc_stack_index
);
480 if (tape
->pc_stack_index
== IDETAPE_PC_STACK
)
481 tape
->pc_stack_index
= 0;
482 return (&tape
->pc_stack
[tape
->pc_stack_index
++]);
486 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
487 * Since we queue packet commands in the request queue, we need to
488 * allocate a request, along with the allocation of a packet command.
491 /**************************************************************
493 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
494 * followed later on by kfree(). -ml *
496 **************************************************************/
498 static struct request
*idetape_next_rq_storage(ide_drive_t
*drive
)
500 idetape_tape_t
*tape
= drive
->driver_data
;
502 debug_log(DBG_PCRQ_STACK
, "rq_stack_index=%d\n", tape
->rq_stack_index
);
504 if (tape
->rq_stack_index
== IDETAPE_PC_STACK
)
505 tape
->rq_stack_index
= 0;
506 return (&tape
->rq_stack
[tape
->rq_stack_index
++]);
509 static void idetape_init_pc(struct ide_atapi_pc
*pc
)
511 memset(pc
->c
, 0, 12);
515 pc
->buf
= pc
->pc_buf
;
516 pc
->buf_size
= IDETAPE_PC_BUFFER_SIZE
;
522 * called on each failed packet command retry to analyze the request sense. We
523 * currently do not utilize this information.
525 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
527 idetape_tape_t
*tape
= drive
->driver_data
;
528 struct ide_atapi_pc
*pc
= tape
->failed_pc
;
530 tape
->sense_key
= sense
[2] & 0xF;
531 tape
->asc
= sense
[12];
532 tape
->ascq
= sense
[13];
534 debug_log(DBG_ERR
, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
535 pc
->c
[0], tape
->sense_key
, tape
->asc
, tape
->ascq
);
537 /* Correct pc->xferred by asking the tape. */
538 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
539 pc
->xferred
= pc
->req_xfer
-
541 get_unaligned_be32(&sense
[3]);
542 idetape_update_buffers(pc
);
546 * If error was the result of a zero-length read or write command,
547 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
548 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
550 if ((pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
)
552 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
553 if (tape
->sense_key
== 5) {
554 /* don't report an error, everything's ok */
556 /* don't retry read/write */
557 pc
->flags
|= PC_FLAG_ABORT
;
560 if (pc
->c
[0] == READ_6
&& (sense
[2] & 0x80)) {
561 pc
->error
= IDETAPE_ERROR_FILEMARK
;
562 pc
->flags
|= PC_FLAG_ABORT
;
564 if (pc
->c
[0] == WRITE_6
) {
565 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
566 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
567 pc
->error
= IDETAPE_ERROR_EOD
;
568 pc
->flags
|= PC_FLAG_ABORT
;
571 if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
572 if (tape
->sense_key
== 8) {
573 pc
->error
= IDETAPE_ERROR_EOD
;
574 pc
->flags
|= PC_FLAG_ABORT
;
576 if (!(pc
->flags
& PC_FLAG_ABORT
) &&
578 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
582 /* Free data buffers completely. */
583 static void ide_tape_kfree_buffer(idetape_tape_t
*tape
)
585 struct idetape_bh
*prev_bh
, *bh
= tape
->merge_bh
;
588 u32 size
= bh
->b_size
;
591 unsigned int order
= fls(size
>> PAGE_SHIFT
)-1;
594 free_pages((unsigned long)bh
->b_data
, order
);
597 bh
->b_data
+= (1 << order
) * PAGE_SIZE
;
603 kfree(tape
->merge_bh
);
606 static int idetape_end_request(ide_drive_t
*drive
, int uptodate
, int nr_sects
)
608 struct request
*rq
= HWGROUP(drive
)->rq
;
609 idetape_tape_t
*tape
= drive
->driver_data
;
613 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
616 case 0: error
= IDETAPE_ERROR_GENERAL
; break;
617 case 1: error
= 0; break;
618 default: error
= uptodate
;
622 tape
->failed_pc
= NULL
;
624 if (!blk_special_request(rq
)) {
625 ide_end_request(drive
, uptodate
, nr_sects
);
629 spin_lock_irqsave(&tape
->lock
, flags
);
631 ide_end_drive_cmd(drive
, 0, 0);
633 spin_unlock_irqrestore(&tape
->lock
, flags
);
637 static ide_startstop_t
idetape_request_sense_callback(ide_drive_t
*drive
)
639 idetape_tape_t
*tape
= drive
->driver_data
;
641 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
643 if (!tape
->pc
->error
) {
644 idetape_analyze_error(drive
, tape
->pc
->buf
);
645 idetape_end_request(drive
, 1, 0);
647 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE itself - "
648 "Aborting request!\n");
649 idetape_end_request(drive
, 0, 0);
654 static void idetape_create_request_sense_cmd(struct ide_atapi_pc
*pc
)
657 pc
->c
[0] = REQUEST_SENSE
;
660 pc
->idetape_callback
= &idetape_request_sense_callback
;
663 static void idetape_init_rq(struct request
*rq
, u8 cmd
)
665 blk_rq_init(NULL
, rq
);
666 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
671 * Generate a new packet command request in front of the request queue, before
672 * the current request, so that it will be processed immediately, on the next
673 * pass through the driver. The function below is called from the request
674 * handling part of the driver (the "bottom" part). Safe storage for the request
675 * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that.
677 * Memory for those requests is pre-allocated at initialization time, and is
678 * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for
679 * the maximum possible number of inter-dependent packet commands.
681 * The higher level of the driver - The ioctl handler and the character device
682 * handling functions should queue request to the lower level part and wait for
683 * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail.
685 static void idetape_queue_pc_head(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
688 struct ide_tape_obj
*tape
= drive
->driver_data
;
690 idetape_init_rq(rq
, REQ_IDETAPE_PC1
);
691 rq
->cmd_flags
|= REQ_PREEMPT
;
692 rq
->buffer
= (char *) pc
;
693 rq
->rq_disk
= tape
->disk
;
694 ide_do_drive_cmd(drive
, rq
);
698 * idetape_retry_pc is called when an error was detected during the
699 * last packet command. We queue a request sense packet command in
700 * the head of the request list.
702 static ide_startstop_t
idetape_retry_pc (ide_drive_t
*drive
)
704 idetape_tape_t
*tape
= drive
->driver_data
;
705 struct ide_atapi_pc
*pc
;
708 (void)ide_read_error(drive
);
709 pc
= idetape_next_pc_storage(drive
);
710 rq
= idetape_next_rq_storage(drive
);
711 idetape_create_request_sense_cmd(pc
);
712 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
713 idetape_queue_pc_head(drive
, pc
, rq
);
718 * Postpone the current request so that ide.c will be able to service requests
719 * from another device on the same hwgroup while we are polling for DSC.
721 static void idetape_postpone_request(ide_drive_t
*drive
)
723 idetape_tape_t
*tape
= drive
->driver_data
;
725 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
727 tape
->postponed_rq
= HWGROUP(drive
)->rq
;
728 ide_stall_queue(drive
, tape
->dsc_poll_freq
);
731 typedef void idetape_io_buf(ide_drive_t
*, struct ide_atapi_pc
*, unsigned int);
734 * This is the usual interrupt handler which will be called during a packet
735 * command. We will transfer some of the data (as requested by the drive) and
736 * will re-point interrupt handler to us. When data transfer is finished, we
737 * will act according to the algorithm described before
740 static ide_startstop_t
idetape_pc_intr(ide_drive_t
*drive
)
742 ide_hwif_t
*hwif
= drive
->hwif
;
743 idetape_tape_t
*tape
= drive
->driver_data
;
744 struct ide_atapi_pc
*pc
= tape
->pc
;
745 xfer_func_t
*xferfunc
;
746 idetape_io_buf
*iobuf
;
749 static int error_sim_count
;
754 debug_log(DBG_PROCS
, "Enter %s - interrupt handler\n", __func__
);
756 /* Clear the interrupt */
757 stat
= ide_read_status(drive
);
759 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
760 if (hwif
->dma_ops
->dma_end(drive
) || (stat
& ERR_STAT
)) {
762 * A DMA error is sometimes expected. For example,
763 * if the tape is crossing a filemark during a
764 * READ command, it will issue an irq and position
765 * itself before the filemark, so that only a partial
766 * data transfer will occur (which causes the DMA
767 * error). In that case, we will later ask the tape
768 * how much bytes of the original request were
769 * actually transferred (we can't receive that
770 * information from the DMA engine on most chipsets).
774 * On the contrary, a DMA error is never expected;
775 * it usually indicates a hardware error or abort.
776 * If the tape crosses a filemark during a READ
777 * command, it will issue an irq and position itself
778 * after the filemark (not before). Only a partial
779 * data transfer will occur, but no DMA error.
782 pc
->flags
|= PC_FLAG_DMA_ERROR
;
784 pc
->xferred
= pc
->req_xfer
;
785 idetape_update_buffers(pc
);
787 debug_log(DBG_PROCS
, "DMA finished\n");
791 /* No more interrupts */
792 if ((stat
& DRQ_STAT
) == 0) {
793 debug_log(DBG_SENSE
, "Packet command completed, %d bytes"
794 " transferred\n", pc
->xferred
);
796 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
797 local_irq_enable_in_hardirq();
800 if ((pc
->c
[0] == WRITE_6
|| pc
->c
[0] == READ_6
) &&
801 (++error_sim_count
% 100) == 0) {
802 printk(KERN_INFO
"ide-tape: %s: simulating error\n",
807 if ((stat
& ERR_STAT
) && pc
->c
[0] == REQUEST_SENSE
)
809 if ((stat
& ERR_STAT
) || (pc
->flags
& PC_FLAG_DMA_ERROR
)) {
811 debug_log(DBG_ERR
, "%s: I/O error\n", tape
->name
);
813 if (pc
->c
[0] == REQUEST_SENSE
) {
814 printk(KERN_ERR
"ide-tape: I/O error in request"
816 return ide_do_reset(drive
);
818 debug_log(DBG_ERR
, "[cmd %x]: check condition\n",
821 /* Retry operation */
822 return idetape_retry_pc(drive
);
825 if ((pc
->flags
& PC_FLAG_WAIT_FOR_DSC
) &&
826 (stat
& SEEK_STAT
) == 0) {
827 /* Media access command */
828 tape
->dsc_polling_start
= jiffies
;
829 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_FAST
;
830 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
831 /* Allow ide.c to handle other requests */
832 idetape_postpone_request(drive
);
835 if (tape
->failed_pc
== pc
)
836 tape
->failed_pc
= NULL
;
837 /* Command finished - Call the callback function */
838 return pc
->idetape_callback(drive
);
841 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
842 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
843 printk(KERN_ERR
"ide-tape: The tape wants to issue more "
844 "interrupts in DMA mode\n");
846 return ide_do_reset(drive
);
848 /* Get the number of bytes to transfer on this interrupt. */
849 bcount
= (hwif
->INB(hwif
->io_ports
.lbah_addr
) << 8) |
850 hwif
->INB(hwif
->io_ports
.lbam_addr
);
852 ireason
= hwif
->INB(hwif
->io_ports
.nsect_addr
);
855 printk(KERN_ERR
"ide-tape: CoD != 0 in %s\n", __func__
);
856 return ide_do_reset(drive
);
858 if (((ireason
& IO
) == IO
) == !!(pc
->flags
& PC_FLAG_WRITING
)) {
859 /* Hopefully, we will never get here */
860 printk(KERN_ERR
"ide-tape: We wanted to %s, ",
861 (ireason
& IO
) ? "Write" : "Read");
862 printk(KERN_ERR
"ide-tape: but the tape wants us to %s !\n",
863 (ireason
& IO
) ? "Read" : "Write");
864 return ide_do_reset(drive
);
866 if (!(pc
->flags
& PC_FLAG_WRITING
)) {
867 /* Reading - Check that we have enough space */
868 temp
= pc
->xferred
+ bcount
;
869 if (temp
> pc
->req_xfer
) {
870 if (temp
> pc
->buf_size
) {
871 printk(KERN_ERR
"ide-tape: The tape wants to "
872 "send us more data than expected "
873 "- discarding data\n");
874 ide_pad_transfer(drive
, 0, bcount
);
875 ide_set_handler(drive
, &idetape_pc_intr
,
876 IDETAPE_WAIT_CMD
, NULL
);
879 debug_log(DBG_SENSE
, "The tape wants to send us more "
880 "data than expected - allowing transfer\n");
882 iobuf
= &idetape_input_buffers
;
883 xferfunc
= hwif
->input_data
;
885 iobuf
= &idetape_output_buffers
;
886 xferfunc
= hwif
->output_data
;
890 iobuf(drive
, pc
, bcount
);
892 xferfunc(drive
, NULL
, pc
->cur_pos
, bcount
);
894 /* Update the current position */
895 pc
->xferred
+= bcount
;
896 pc
->cur_pos
+= bcount
;
898 debug_log(DBG_SENSE
, "[cmd %x] transferred %d bytes on that intr.\n",
901 /* And set the interrupt handler again */
902 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
907 * Packet Command Interface
909 * The current Packet Command is available in tape->pc, and will not change
910 * until we finish handling it. Each packet command is associated with a
911 * callback function that will be called when the command is finished.
913 * The handling will be done in three stages:
915 * 1. idetape_issue_pc will send the packet command to the drive, and will set
916 * the interrupt handler to idetape_pc_intr.
918 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
919 * repeated until the device signals us that no more interrupts will be issued.
921 * 3. ATAPI Tape media access commands have immediate status with a delayed
922 * process. In case of a successful initiation of a media access packet command,
923 * the DSC bit will be set when the actual execution of the command is finished.
924 * Since the tape drive will not issue an interrupt, we have to poll for this
925 * event. In this case, we define the request as "low priority request" by
926 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
929 * ide.c will then give higher priority to requests which originate from the
930 * other device, until will change rq_status to RQ_ACTIVE.
932 * 4. When the packet command is finished, it will be checked for errors.
934 * 5. In case an error was found, we queue a request sense packet command in
935 * front of the request queue and retry the operation up to
936 * IDETAPE_MAX_PC_RETRIES times.
938 * 6. In case no error was found, or we decided to give up and not to retry
939 * again, the callback function will be called and then we will handle the next
942 static ide_startstop_t
idetape_transfer_pc(ide_drive_t
*drive
)
944 ide_hwif_t
*hwif
= drive
->hwif
;
945 idetape_tape_t
*tape
= drive
->driver_data
;
946 struct ide_atapi_pc
*pc
= tape
->pc
;
948 ide_startstop_t startstop
;
951 if (ide_wait_stat(&startstop
, drive
, DRQ_STAT
, BUSY_STAT
, WAIT_READY
)) {
952 printk(KERN_ERR
"ide-tape: Strange, packet command initiated "
953 "yet DRQ isn't asserted\n");
956 ireason
= hwif
->INB(hwif
->io_ports
.nsect_addr
);
957 while (retries
-- && ((ireason
& CD
) == 0 || (ireason
& IO
))) {
958 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while issuing "
959 "a packet command, retrying\n");
961 ireason
= hwif
->INB(hwif
->io_ports
.nsect_addr
);
963 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while "
964 "issuing a packet command, ignoring\n");
969 if ((ireason
& CD
) == 0 || (ireason
& IO
)) {
970 printk(KERN_ERR
"ide-tape: (IO,CoD) != (0,1) while issuing "
971 "a packet command\n");
972 return ide_do_reset(drive
);
974 /* Set the interrupt routine */
975 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
976 #ifdef CONFIG_BLK_DEV_IDEDMA
977 /* Begin DMA, if necessary */
978 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
)
979 hwif
->dma_ops
->dma_start(drive
);
981 /* Send the actual packet */
982 hwif
->output_data(drive
, NULL
, pc
->c
, 12);
987 static ide_startstop_t
idetape_issue_pc(ide_drive_t
*drive
,
988 struct ide_atapi_pc
*pc
)
990 ide_hwif_t
*hwif
= drive
->hwif
;
991 idetape_tape_t
*tape
= drive
->driver_data
;
995 if (tape
->pc
->c
[0] == REQUEST_SENSE
&&
996 pc
->c
[0] == REQUEST_SENSE
) {
997 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
998 "Two request sense in serial were issued\n");
1001 if (tape
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
1002 tape
->failed_pc
= pc
;
1003 /* Set the current packet command */
1006 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
1007 (pc
->flags
& PC_FLAG_ABORT
)) {
1009 * We will "abort" retrying a packet command in case legitimate
1010 * error code was received (crossing a filemark, or end of the
1011 * media, for example).
1013 if (!(pc
->flags
& PC_FLAG_ABORT
)) {
1014 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
1015 tape
->sense_key
== 2 && tape
->asc
== 4 &&
1016 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
1017 printk(KERN_ERR
"ide-tape: %s: I/O error, "
1018 "pc = %2x, key = %2x, "
1019 "asc = %2x, ascq = %2x\n",
1020 tape
->name
, pc
->c
[0],
1021 tape
->sense_key
, tape
->asc
,
1025 pc
->error
= IDETAPE_ERROR_GENERAL
;
1027 tape
->failed_pc
= NULL
;
1028 return pc
->idetape_callback(drive
);
1030 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
1033 /* We haven't transferred any data yet */
1035 pc
->cur_pos
= pc
->buf
;
1036 /* Request to transfer the entire buffer at once */
1037 bcount
= pc
->req_xfer
;
1039 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
1040 pc
->flags
&= ~PC_FLAG_DMA_ERROR
;
1041 printk(KERN_WARNING
"ide-tape: DMA disabled, "
1042 "reverting to PIO\n");
1045 if ((pc
->flags
& PC_FLAG_DMA_RECOMMENDED
) && drive
->using_dma
)
1046 dma_ok
= !hwif
->dma_ops
->dma_setup(drive
);
1048 ide_pktcmd_tf_load(drive
, IDE_TFLAG_OUT_DEVICE
, bcount
, dma_ok
);
1051 /* Will begin DMA later */
1052 pc
->flags
|= PC_FLAG_DMA_IN_PROGRESS
;
1053 if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT
, &tape
->flags
)) {
1054 ide_execute_command(drive
, WIN_PACKETCMD
, &idetape_transfer_pc
,
1055 IDETAPE_WAIT_CMD
, NULL
);
1058 ide_execute_pkt_cmd(drive
);
1059 return idetape_transfer_pc(drive
);
1063 static ide_startstop_t
idetape_pc_callback(ide_drive_t
*drive
)
1065 idetape_tape_t
*tape
= drive
->driver_data
;
1067 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1069 idetape_end_request(drive
, tape
->pc
->error
? 0 : 1, 0);
1073 /* A mode sense command is used to "sense" tape parameters. */
1074 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc
*pc
, u8 page_code
)
1076 idetape_init_pc(pc
);
1077 pc
->c
[0] = MODE_SENSE
;
1078 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
1079 /* DBD = 1 - Don't return block descriptors */
1081 pc
->c
[2] = page_code
;
1083 * Changed pc->c[3] to 0 (255 will at best return unused info).
1085 * For SCSI this byte is defined as subpage instead of high byte
1086 * of length and some IDE drives seem to interpret it this way
1087 * and return an error when 255 is used.
1090 /* We will just discard data in that case */
1092 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
1094 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
1098 pc
->idetape_callback
= &idetape_pc_callback
;
1101 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
1103 idetape_tape_t
*tape
= drive
->driver_data
;
1104 struct ide_atapi_pc
*pc
= tape
->pc
;
1107 stat
= ide_read_status(drive
);
1109 if (stat
& SEEK_STAT
) {
1110 if (stat
& ERR_STAT
) {
1111 /* Error detected */
1112 if (pc
->c
[0] != TEST_UNIT_READY
)
1113 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
1115 /* Retry operation */
1116 return idetape_retry_pc(drive
);
1119 if (tape
->failed_pc
== pc
)
1120 tape
->failed_pc
= NULL
;
1122 pc
->error
= IDETAPE_ERROR_GENERAL
;
1123 tape
->failed_pc
= NULL
;
1125 return pc
->idetape_callback(drive
);
1128 static ide_startstop_t
idetape_rw_callback(ide_drive_t
*drive
)
1130 idetape_tape_t
*tape
= drive
->driver_data
;
1131 struct request
*rq
= HWGROUP(drive
)->rq
;
1132 int blocks
= tape
->pc
->xferred
/ tape
->blk_size
;
1134 tape
->avg_size
+= blocks
* tape
->blk_size
;
1136 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
1137 tape
->avg_speed
= tape
->avg_size
* HZ
/
1138 (jiffies
- tape
->avg_time
) / 1024;
1140 tape
->avg_time
= jiffies
;
1142 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1144 tape
->first_frame
+= blocks
;
1145 rq
->current_nr_sectors
-= blocks
;
1147 if (!tape
->pc
->error
)
1148 idetape_end_request(drive
, 1, 0);
1150 idetape_end_request(drive
, tape
->pc
->error
, 0);
1154 static void idetape_create_read_cmd(idetape_tape_t
*tape
,
1155 struct ide_atapi_pc
*pc
,
1156 unsigned int length
, struct idetape_bh
*bh
)
1158 idetape_init_pc(pc
);
1160 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1162 pc
->idetape_callback
= &idetape_rw_callback
;
1164 atomic_set(&bh
->b_count
, 0);
1166 pc
->buf_size
= length
* tape
->blk_size
;
1167 pc
->req_xfer
= pc
->buf_size
;
1168 if (pc
->req_xfer
== tape
->buffer_size
)
1169 pc
->flags
|= PC_FLAG_DMA_RECOMMENDED
;
1172 static void idetape_create_write_cmd(idetape_tape_t
*tape
,
1173 struct ide_atapi_pc
*pc
,
1174 unsigned int length
, struct idetape_bh
*bh
)
1176 idetape_init_pc(pc
);
1178 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1180 pc
->idetape_callback
= &idetape_rw_callback
;
1181 pc
->flags
|= PC_FLAG_WRITING
;
1183 pc
->b_data
= bh
->b_data
;
1184 pc
->b_count
= atomic_read(&bh
->b_count
);
1186 pc
->buf_size
= length
* tape
->blk_size
;
1187 pc
->req_xfer
= pc
->buf_size
;
1188 if (pc
->req_xfer
== tape
->buffer_size
)
1189 pc
->flags
|= PC_FLAG_DMA_RECOMMENDED
;
1192 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
1193 struct request
*rq
, sector_t block
)
1195 idetape_tape_t
*tape
= drive
->driver_data
;
1196 struct ide_atapi_pc
*pc
= NULL
;
1197 struct request
*postponed_rq
= tape
->postponed_rq
;
1200 debug_log(DBG_SENSE
, "sector: %ld, nr_sectors: %ld,"
1201 " current_nr_sectors: %d\n",
1202 rq
->sector
, rq
->nr_sectors
, rq
->current_nr_sectors
);
1204 if (!blk_special_request(rq
)) {
1205 /* We do not support buffer cache originated requests. */
1206 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
1207 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
1208 ide_end_request(drive
, 0, 0);
1212 /* Retry a failed packet command */
1213 if (tape
->failed_pc
&& tape
->pc
->c
[0] == REQUEST_SENSE
)
1214 return idetape_issue_pc(drive
, tape
->failed_pc
);
1216 if (postponed_rq
!= NULL
)
1217 if (rq
!= postponed_rq
) {
1218 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
1219 "Two DSC requests were queued\n");
1220 idetape_end_request(drive
, 0, 0);
1224 tape
->postponed_rq
= NULL
;
1227 * If the tape is still busy, postpone our request and service
1228 * the other device meanwhile.
1230 stat
= ide_read_status(drive
);
1232 if (!drive
->dsc_overlap
&& !(rq
->cmd
[0] & REQ_IDETAPE_PC2
))
1233 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
1235 if (drive
->post_reset
== 1) {
1236 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
1237 drive
->post_reset
= 0;
1240 if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
) &&
1241 (stat
& SEEK_STAT
) == 0) {
1242 if (postponed_rq
== NULL
) {
1243 tape
->dsc_polling_start
= jiffies
;
1244 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
1245 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
1246 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
1247 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
1249 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1250 idetape_media_access_finished(drive
);
1253 return ide_do_reset(drive
);
1255 } else if (time_after(jiffies
,
1256 tape
->dsc_polling_start
+
1257 IDETAPE_DSC_MA_THRESHOLD
))
1258 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
1259 idetape_postpone_request(drive
);
1262 if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1263 pc
= idetape_next_pc_storage(drive
);
1264 idetape_create_read_cmd(tape
, pc
, rq
->current_nr_sectors
,
1265 (struct idetape_bh
*)rq
->special
);
1268 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1269 pc
= idetape_next_pc_storage(drive
);
1270 idetape_create_write_cmd(tape
, pc
, rq
->current_nr_sectors
,
1271 (struct idetape_bh
*)rq
->special
);
1274 if (rq
->cmd
[0] & REQ_IDETAPE_PC1
) {
1275 pc
= (struct ide_atapi_pc
*) rq
->buffer
;
1276 rq
->cmd
[0] &= ~(REQ_IDETAPE_PC1
);
1277 rq
->cmd
[0] |= REQ_IDETAPE_PC2
;
1280 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1281 idetape_media_access_finished(drive
);
1286 return idetape_issue_pc(drive
, pc
);
1290 * The function below uses __get_free_pages to allocate a data buffer of size
1291 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
1294 * It returns a pointer to the newly allocated buffer, or NULL in case of
1297 static struct idetape_bh
*ide_tape_kmalloc_buffer(idetape_tape_t
*tape
,
1298 int full
, int clear
)
1300 struct idetape_bh
*prev_bh
, *bh
, *merge_bh
;
1301 int pages
= tape
->pages_per_buffer
;
1302 unsigned int order
, b_allocd
;
1303 char *b_data
= NULL
;
1305 merge_bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1310 order
= fls(pages
) - 1;
1311 bh
->b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
1314 b_allocd
= (1 << order
) * PAGE_SIZE
;
1318 memset(bh
->b_data
, 0, b_allocd
);
1319 bh
->b_reqnext
= NULL
;
1320 bh
->b_size
= b_allocd
;
1321 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1324 order
= fls(pages
) - 1;
1325 b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
1328 b_allocd
= (1 << order
) * PAGE_SIZE
;
1331 memset(b_data
, 0, b_allocd
);
1333 /* newly allocated page frames below buffer header or ...*/
1334 if (bh
->b_data
== b_data
+ b_allocd
) {
1335 bh
->b_size
+= b_allocd
;
1336 bh
->b_data
-= b_allocd
;
1338 atomic_add(b_allocd
, &bh
->b_count
);
1341 /* they are above the header */
1342 if (b_data
== bh
->b_data
+ bh
->b_size
) {
1343 bh
->b_size
+= b_allocd
;
1345 atomic_add(b_allocd
, &bh
->b_count
);
1349 bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1351 free_pages((unsigned long) b_data
, order
);
1354 bh
->b_reqnext
= NULL
;
1355 bh
->b_data
= b_data
;
1356 bh
->b_size
= b_allocd
;
1357 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1358 prev_bh
->b_reqnext
= bh
;
1363 bh
->b_size
-= tape
->excess_bh_size
;
1365 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
1368 ide_tape_kfree_buffer(tape
);
1372 static int idetape_copy_stage_from_user(idetape_tape_t
*tape
,
1373 const char __user
*buf
, int n
)
1375 struct idetape_bh
*bh
= tape
->bh
;
1381 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1385 count
= min((unsigned int)
1386 (bh
->b_size
- atomic_read(&bh
->b_count
)),
1388 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
,
1392 atomic_add(count
, &bh
->b_count
);
1394 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
1397 atomic_set(&bh
->b_count
, 0);
1404 static int idetape_copy_stage_to_user(idetape_tape_t
*tape
, char __user
*buf
,
1407 struct idetape_bh
*bh
= tape
->bh
;
1413 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1417 count
= min(tape
->b_count
, n
);
1418 if (copy_to_user(buf
, tape
->b_data
, count
))
1421 tape
->b_data
+= count
;
1422 tape
->b_count
-= count
;
1424 if (!tape
->b_count
) {
1428 tape
->b_data
= bh
->b_data
;
1429 tape
->b_count
= atomic_read(&bh
->b_count
);
1436 static void idetape_init_merge_buffer(idetape_tape_t
*tape
)
1438 struct idetape_bh
*bh
= tape
->merge_bh
;
1439 tape
->bh
= tape
->merge_bh
;
1441 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1442 atomic_set(&bh
->b_count
, 0);
1444 tape
->b_data
= bh
->b_data
;
1445 tape
->b_count
= atomic_read(&bh
->b_count
);
1449 static ide_startstop_t
idetape_read_position_callback(ide_drive_t
*drive
)
1451 idetape_tape_t
*tape
= drive
->driver_data
;
1452 u8
*readpos
= tape
->pc
->buf
;
1454 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1456 if (!tape
->pc
->error
) {
1457 debug_log(DBG_SENSE
, "BOP - %s\n",
1458 (readpos
[0] & 0x80) ? "Yes" : "No");
1459 debug_log(DBG_SENSE
, "EOP - %s\n",
1460 (readpos
[0] & 0x40) ? "Yes" : "No");
1462 if (readpos
[0] & 0x4) {
1463 printk(KERN_INFO
"ide-tape: Block location is unknown"
1465 clear_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
);
1466 idetape_end_request(drive
, 0, 0);
1468 debug_log(DBG_SENSE
, "Block Location - %u\n",
1469 be32_to_cpu(*(u32
*)&readpos
[4]));
1471 tape
->partition
= readpos
[1];
1473 be32_to_cpu(*(u32
*)&readpos
[4]);
1474 set_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
);
1475 idetape_end_request(drive
, 1, 0);
1478 idetape_end_request(drive
, 0, 0);
1484 * Write a filemark if write_filemark=1. Flush the device buffers without
1485 * writing a filemark otherwise.
1487 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
1488 struct ide_atapi_pc
*pc
, int write_filemark
)
1490 idetape_init_pc(pc
);
1491 pc
->c
[0] = WRITE_FILEMARKS
;
1492 pc
->c
[4] = write_filemark
;
1493 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1494 pc
->idetape_callback
= &idetape_pc_callback
;
1497 static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc
*pc
)
1499 idetape_init_pc(pc
);
1500 pc
->c
[0] = TEST_UNIT_READY
;
1501 pc
->idetape_callback
= &idetape_pc_callback
;
1505 * We add a special packet command request to the tail of the request queue, and
1506 * wait for it to be serviced. This is not to be called from within the request
1507 * handling part of the driver! We allocate here data on the stack and it is
1508 * valid until the request is finished. This is not the case for the bottom part
1509 * of the driver, where we are always leaving the functions to wait for an
1510 * interrupt or a timer event.
1512 * From the bottom part of the driver, we should allocate safe memory using
1513 * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request
1514 * to the request list without waiting for it to be serviced! In that case, we
1515 * usually use idetape_queue_pc_head().
1517 static int idetape_queue_pc_tail(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
)
1519 struct ide_tape_obj
*tape
= drive
->driver_data
;
1523 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
1524 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1525 rq
->cmd
[0] = REQ_IDETAPE_PC1
;
1526 rq
->buffer
= (char *)pc
;
1527 error
= blk_execute_rq(drive
->queue
, tape
->disk
, rq
, 0);
1528 blk_put_request(rq
);
1532 static void idetape_create_load_unload_cmd(ide_drive_t
*drive
,
1533 struct ide_atapi_pc
*pc
, int cmd
)
1535 idetape_init_pc(pc
);
1536 pc
->c
[0] = START_STOP
;
1538 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1539 pc
->idetape_callback
= &idetape_pc_callback
;
1542 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
1544 idetape_tape_t
*tape
= drive
->driver_data
;
1545 struct ide_atapi_pc pc
;
1546 int load_attempted
= 0;
1548 /* Wait for the tape to become ready */
1549 set_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
);
1551 while (time_before(jiffies
, timeout
)) {
1552 idetape_create_test_unit_ready_cmd(&pc
);
1553 if (!idetape_queue_pc_tail(drive
, &pc
))
1555 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
1556 || (tape
->asc
== 0x3A)) {
1560 idetape_create_load_unload_cmd(drive
, &pc
,
1561 IDETAPE_LU_LOAD_MASK
);
1562 idetape_queue_pc_tail(drive
, &pc
);
1564 /* not about to be ready */
1565 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
1566 (tape
->ascq
== 1 || tape
->ascq
== 8)))
1573 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
1575 struct ide_atapi_pc pc
;
1578 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
1579 rc
= idetape_queue_pc_tail(drive
, &pc
);
1582 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1586 static void idetape_create_read_position_cmd(struct ide_atapi_pc
*pc
)
1588 idetape_init_pc(pc
);
1589 pc
->c
[0] = READ_POSITION
;
1591 pc
->idetape_callback
= &idetape_read_position_callback
;
1594 static int idetape_read_position(ide_drive_t
*drive
)
1596 idetape_tape_t
*tape
= drive
->driver_data
;
1597 struct ide_atapi_pc pc
;
1600 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1602 idetape_create_read_position_cmd(&pc
);
1603 if (idetape_queue_pc_tail(drive
, &pc
))
1605 position
= tape
->first_frame
;
1609 static void idetape_create_locate_cmd(ide_drive_t
*drive
,
1610 struct ide_atapi_pc
*pc
,
1611 unsigned int block
, u8 partition
, int skip
)
1613 idetape_init_pc(pc
);
1614 pc
->c
[0] = POSITION_TO_ELEMENT
;
1616 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
1617 pc
->c
[8] = partition
;
1618 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1619 pc
->idetape_callback
= &idetape_pc_callback
;
1622 static int idetape_create_prevent_cmd(ide_drive_t
*drive
,
1623 struct ide_atapi_pc
*pc
, int prevent
)
1625 idetape_tape_t
*tape
= drive
->driver_data
;
1627 /* device supports locking according to capabilities page */
1628 if (!(tape
->caps
[6] & 0x01))
1631 idetape_init_pc(pc
);
1632 pc
->c
[0] = ALLOW_MEDIUM_REMOVAL
;
1634 pc
->idetape_callback
= &idetape_pc_callback
;
1638 static void __ide_tape_discard_merge_buffer(ide_drive_t
*drive
)
1640 idetape_tape_t
*tape
= drive
->driver_data
;
1642 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
1645 clear_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
);
1646 tape
->merge_bh_size
= 0;
1647 if (tape
->merge_bh
!= NULL
) {
1648 ide_tape_kfree_buffer(tape
);
1649 tape
->merge_bh
= NULL
;
1652 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1656 * Position the tape to the requested block using the LOCATE packet command.
1657 * A READ POSITION command is then issued to check where we are positioned. Like
1658 * all higher level operations, we queue the commands at the tail of the request
1659 * queue and wait for their completion.
1661 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
1662 u8 partition
, int skip
)
1664 idetape_tape_t
*tape
= drive
->driver_data
;
1666 struct ide_atapi_pc pc
;
1668 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1669 __ide_tape_discard_merge_buffer(drive
);
1670 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1671 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
1672 retval
= idetape_queue_pc_tail(drive
, &pc
);
1676 idetape_create_read_position_cmd(&pc
);
1677 return (idetape_queue_pc_tail(drive
, &pc
));
1680 static void ide_tape_discard_merge_buffer(ide_drive_t
*drive
,
1681 int restore_position
)
1683 idetape_tape_t
*tape
= drive
->driver_data
;
1686 __ide_tape_discard_merge_buffer(drive
);
1687 if (restore_position
) {
1688 position
= idetape_read_position(drive
);
1689 seek
= position
> 0 ? position
: 0;
1690 if (idetape_position_tape(drive
, seek
, 0, 0)) {
1691 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
1692 " %s\n", tape
->name
, __func__
);
1699 * Generate a read/write request for the block device interface and wait for it
1702 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
,
1703 struct idetape_bh
*bh
)
1705 idetape_tape_t
*tape
= drive
->driver_data
;
1709 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
1711 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
1712 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1714 rq
->rq_disk
= tape
->disk
;
1715 rq
->special
= (void *)bh
;
1716 rq
->sector
= tape
->first_frame
;
1717 rq
->nr_sectors
= blocks
;
1718 rq
->current_nr_sectors
= blocks
;
1719 blk_execute_rq(drive
->queue
, tape
->disk
, rq
, 0);
1721 errors
= rq
->errors
;
1722 ret
= tape
->blk_size
* (blocks
- rq
->current_nr_sectors
);
1723 blk_put_request(rq
);
1725 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
1729 idetape_init_merge_buffer(tape
);
1730 if (errors
== IDETAPE_ERROR_GENERAL
)
1735 static void idetape_create_inquiry_cmd(struct ide_atapi_pc
*pc
)
1737 idetape_init_pc(pc
);
1741 pc
->idetape_callback
= &idetape_pc_callback
;
1744 static void idetape_create_rewind_cmd(ide_drive_t
*drive
,
1745 struct ide_atapi_pc
*pc
)
1747 idetape_init_pc(pc
);
1748 pc
->c
[0] = REZERO_UNIT
;
1749 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1750 pc
->idetape_callback
= &idetape_pc_callback
;
1753 static void idetape_create_erase_cmd(struct ide_atapi_pc
*pc
)
1755 idetape_init_pc(pc
);
1758 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1759 pc
->idetape_callback
= &idetape_pc_callback
;
1762 static void idetape_create_space_cmd(struct ide_atapi_pc
*pc
, int count
, u8 cmd
)
1764 idetape_init_pc(pc
);
1766 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
1768 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1769 pc
->idetape_callback
= &idetape_pc_callback
;
1772 /* Queue up a character device originated write request. */
1773 static int idetape_add_chrdev_write_request(ide_drive_t
*drive
, int blocks
)
1775 idetape_tape_t
*tape
= drive
->driver_data
;
1777 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1779 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
1780 blocks
, tape
->merge_bh
);
1783 static void ide_tape_flush_merge_buffer(ide_drive_t
*drive
)
1785 idetape_tape_t
*tape
= drive
->driver_data
;
1787 struct idetape_bh
*bh
;
1789 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1790 printk(KERN_ERR
"ide-tape: bug: Trying to empty merge buffer"
1791 " but we are not writing.\n");
1794 if (tape
->merge_bh_size
> tape
->buffer_size
) {
1795 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
1796 tape
->merge_bh_size
= tape
->buffer_size
;
1798 if (tape
->merge_bh_size
) {
1799 blocks
= tape
->merge_bh_size
/ tape
->blk_size
;
1800 if (tape
->merge_bh_size
% tape
->blk_size
) {
1804 i
= tape
->blk_size
- tape
->merge_bh_size
%
1806 bh
= tape
->bh
->b_reqnext
;
1808 atomic_set(&bh
->b_count
, 0);
1814 printk(KERN_INFO
"ide-tape: bug,"
1818 min
= min(i
, (unsigned int)(bh
->b_size
-
1819 atomic_read(&bh
->b_count
)));
1820 memset(bh
->b_data
+ atomic_read(&bh
->b_count
),
1822 atomic_add(min
, &bh
->b_count
);
1827 (void) idetape_add_chrdev_write_request(drive
, blocks
);
1828 tape
->merge_bh_size
= 0;
1830 if (tape
->merge_bh
!= NULL
) {
1831 ide_tape_kfree_buffer(tape
);
1832 tape
->merge_bh
= NULL
;
1834 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1837 static int idetape_init_read(ide_drive_t
*drive
)
1839 idetape_tape_t
*tape
= drive
->driver_data
;
1842 /* Initialize read operation */
1843 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1844 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1845 ide_tape_flush_merge_buffer(drive
);
1846 idetape_flush_tape_buffers(drive
);
1848 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1849 printk(KERN_ERR
"ide-tape: merge_bh_size should be"
1851 tape
->merge_bh_size
= 0;
1853 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1854 if (!tape
->merge_bh
)
1856 tape
->chrdev_dir
= IDETAPE_DIR_READ
;
1859 * Issue a read 0 command to ensure that DSC handshake is
1860 * switched from completion mode to buffer available mode.
1861 * No point in issuing this if DSC overlap isn't supported, some
1862 * drives (Seagate STT3401A) will return an error.
1864 if (drive
->dsc_overlap
) {
1865 bytes_read
= idetape_queue_rw_tail(drive
,
1866 REQ_IDETAPE_READ
, 0,
1868 if (bytes_read
< 0) {
1869 ide_tape_kfree_buffer(tape
);
1870 tape
->merge_bh
= NULL
;
1871 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1880 /* called from idetape_chrdev_read() to service a chrdev read request. */
1881 static int idetape_add_chrdev_read_request(ide_drive_t
*drive
, int blocks
)
1883 idetape_tape_t
*tape
= drive
->driver_data
;
1885 debug_log(DBG_PROCS
, "Enter %s, %d blocks\n", __func__
, blocks
);
1887 /* If we are at a filemark, return a read length of 0 */
1888 if (test_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
))
1891 idetape_init_read(drive
);
1893 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
,
1897 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
1899 idetape_tape_t
*tape
= drive
->driver_data
;
1900 struct idetape_bh
*bh
;
1906 bh
= tape
->merge_bh
;
1907 count
= min(tape
->buffer_size
, bcount
);
1909 blocks
= count
/ tape
->blk_size
;
1911 atomic_set(&bh
->b_count
,
1912 min(count
, (unsigned int)bh
->b_size
));
1913 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
1914 count
-= atomic_read(&bh
->b_count
);
1917 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
,
1923 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1924 * currently support only one partition.
1926 static int idetape_rewind_tape(ide_drive_t
*drive
)
1929 struct ide_atapi_pc pc
;
1930 idetape_tape_t
*tape
;
1931 tape
= drive
->driver_data
;
1933 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
1935 idetape_create_rewind_cmd(drive
, &pc
);
1936 retval
= idetape_queue_pc_tail(drive
, &pc
);
1940 idetape_create_read_position_cmd(&pc
);
1941 retval
= idetape_queue_pc_tail(drive
, &pc
);
1947 /* mtio.h compatible commands should be issued to the chrdev interface. */
1948 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
1951 idetape_tape_t
*tape
= drive
->driver_data
;
1952 void __user
*argp
= (void __user
*)arg
;
1954 struct idetape_config
{
1955 int dsc_rw_frequency
;
1956 int dsc_media_access_frequency
;
1960 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1964 if (copy_from_user(&config
, argp
, sizeof(config
)))
1966 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
1969 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
1970 config
.nr_stages
= 1;
1971 if (copy_to_user(argp
, &config
, sizeof(config
)))
1980 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
1983 idetape_tape_t
*tape
= drive
->driver_data
;
1984 struct ide_atapi_pc pc
;
1985 int retval
, count
= 0;
1986 int sprev
= !!(tape
->caps
[4] & 0x20);
1990 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
1993 mt_count
= -mt_count
;
1996 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1997 tape
->merge_bh_size
= 0;
1998 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
))
2000 ide_tape_discard_merge_buffer(drive
, 0);
2006 idetape_create_space_cmd(&pc
, mt_count
- count
,
2007 IDETAPE_SPACE_OVER_FILEMARK
);
2008 return idetape_queue_pc_tail(drive
, &pc
);
2013 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
2017 count
= (MTBSFM
== mt_op
? 1 : -1);
2018 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
2020 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
2027 * Our character device read / write functions.
2029 * The tape is optimized to maximize throughput when it is transferring an
2030 * integral number of the "continuous transfer limit", which is a parameter of
2031 * the specific tape (26kB on my particular tape, 32kB for Onstream).
2033 * As of version 1.3 of the driver, the character device provides an abstract
2034 * continuous view of the media - any mix of block sizes (even 1 byte) on the
2035 * same backup/restore procedure is supported. The driver will internally
2036 * convert the requests to the recommended transfer unit, so that an unmatch
2037 * between the user's block size to the recommended size will only result in a
2038 * (slightly) increased driver overhead, but will no longer hit performance.
2039 * This is not applicable to Onstream.
2041 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
2042 size_t count
, loff_t
*ppos
)
2044 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2045 ide_drive_t
*drive
= tape
->drive
;
2046 ssize_t bytes_read
, temp
, actually_read
= 0, rc
;
2048 u16 ctl
= *(u16
*)&tape
->caps
[12];
2050 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
2052 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
2053 if (test_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
))
2054 if (count
> tape
->blk_size
&&
2055 (count
% tape
->blk_size
) == 0)
2056 tape
->user_bs_factor
= count
/ tape
->blk_size
;
2058 rc
= idetape_init_read(drive
);
2063 if (tape
->merge_bh_size
) {
2064 actually_read
= min((unsigned int)(tape
->merge_bh_size
),
2065 (unsigned int)count
);
2066 if (idetape_copy_stage_to_user(tape
, buf
, actually_read
))
2068 buf
+= actually_read
;
2069 tape
->merge_bh_size
-= actually_read
;
2070 count
-= actually_read
;
2072 while (count
>= tape
->buffer_size
) {
2073 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
2074 if (bytes_read
<= 0)
2076 if (idetape_copy_stage_to_user(tape
, buf
, bytes_read
))
2079 count
-= bytes_read
;
2080 actually_read
+= bytes_read
;
2083 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
2084 if (bytes_read
<= 0)
2086 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
2087 if (idetape_copy_stage_to_user(tape
, buf
, temp
))
2089 actually_read
+= temp
;
2090 tape
->merge_bh_size
= bytes_read
-temp
;
2093 if (!actually_read
&& test_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
)) {
2094 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
2096 idetape_space_over_filemarks(drive
, MTFSF
, 1);
2100 return ret
? ret
: actually_read
;
2103 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
2104 size_t count
, loff_t
*ppos
)
2106 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2107 ide_drive_t
*drive
= tape
->drive
;
2108 ssize_t actually_written
= 0;
2110 u16 ctl
= *(u16
*)&tape
->caps
[12];
2112 /* The drive is write protected. */
2113 if (tape
->write_prot
)
2116 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
2118 /* Initialize write operation */
2119 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
2120 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
2121 ide_tape_discard_merge_buffer(drive
, 1);
2122 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
2123 printk(KERN_ERR
"ide-tape: merge_bh_size "
2124 "should be 0 now\n");
2125 tape
->merge_bh_size
= 0;
2127 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
2128 if (!tape
->merge_bh
)
2130 tape
->chrdev_dir
= IDETAPE_DIR_WRITE
;
2131 idetape_init_merge_buffer(tape
);
2134 * Issue a write 0 command to ensure that DSC handshake is
2135 * switched from completion mode to buffer available mode. No
2136 * point in issuing this if DSC overlap isn't supported, some
2137 * drives (Seagate STT3401A) will return an error.
2139 if (drive
->dsc_overlap
) {
2140 ssize_t retval
= idetape_queue_rw_tail(drive
,
2141 REQ_IDETAPE_WRITE
, 0,
2144 ide_tape_kfree_buffer(tape
);
2145 tape
->merge_bh
= NULL
;
2146 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2153 if (tape
->merge_bh_size
) {
2154 if (tape
->merge_bh_size
>= tape
->buffer_size
) {
2155 printk(KERN_ERR
"ide-tape: bug: merge buf too big\n");
2156 tape
->merge_bh_size
= 0;
2158 actually_written
= min((unsigned int)
2159 (tape
->buffer_size
- tape
->merge_bh_size
),
2160 (unsigned int)count
);
2161 if (idetape_copy_stage_from_user(tape
, buf
, actually_written
))
2163 buf
+= actually_written
;
2164 tape
->merge_bh_size
+= actually_written
;
2165 count
-= actually_written
;
2167 if (tape
->merge_bh_size
== tape
->buffer_size
) {
2169 tape
->merge_bh_size
= 0;
2170 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
2175 while (count
>= tape
->buffer_size
) {
2177 if (idetape_copy_stage_from_user(tape
, buf
, tape
->buffer_size
))
2179 buf
+= tape
->buffer_size
;
2180 count
-= tape
->buffer_size
;
2181 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
2182 actually_written
+= tape
->buffer_size
;
2187 actually_written
+= count
;
2188 if (idetape_copy_stage_from_user(tape
, buf
, count
))
2190 tape
->merge_bh_size
+= count
;
2192 return ret
? ret
: actually_written
;
2195 static int idetape_write_filemark(ide_drive_t
*drive
)
2197 struct ide_atapi_pc pc
;
2199 /* Write a filemark */
2200 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
2201 if (idetape_queue_pc_tail(drive
, &pc
)) {
2202 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
2209 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
2212 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
2213 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
2214 * usually not supported.
2216 * The following commands are currently not supported:
2218 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
2219 * MT_ST_WRITE_THRESHOLD.
2221 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
2223 idetape_tape_t
*tape
= drive
->driver_data
;
2224 struct ide_atapi_pc pc
;
2227 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
2237 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
2244 if (tape
->write_prot
)
2246 ide_tape_discard_merge_buffer(drive
, 1);
2247 for (i
= 0; i
< mt_count
; i
++) {
2248 retval
= idetape_write_filemark(drive
);
2254 ide_tape_discard_merge_buffer(drive
, 0);
2255 if (idetape_rewind_tape(drive
))
2259 ide_tape_discard_merge_buffer(drive
, 0);
2260 idetape_create_load_unload_cmd(drive
, &pc
,
2261 IDETAPE_LU_LOAD_MASK
);
2262 return idetape_queue_pc_tail(drive
, &pc
);
2266 * If door is locked, attempt to unlock before
2267 * attempting to eject.
2269 if (tape
->door_locked
) {
2270 if (idetape_create_prevent_cmd(drive
, &pc
, 0))
2271 if (!idetape_queue_pc_tail(drive
, &pc
))
2272 tape
->door_locked
= DOOR_UNLOCKED
;
2274 ide_tape_discard_merge_buffer(drive
, 0);
2275 idetape_create_load_unload_cmd(drive
, &pc
,
2276 !IDETAPE_LU_LOAD_MASK
);
2277 retval
= idetape_queue_pc_tail(drive
, &pc
);
2279 clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
);
2282 ide_tape_discard_merge_buffer(drive
, 0);
2283 return idetape_flush_tape_buffers(drive
);
2285 ide_tape_discard_merge_buffer(drive
, 0);
2286 idetape_create_load_unload_cmd(drive
, &pc
,
2287 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
2288 return idetape_queue_pc_tail(drive
, &pc
);
2290 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
2291 return idetape_queue_pc_tail(drive
, &pc
);
2293 (void)idetape_rewind_tape(drive
);
2294 idetape_create_erase_cmd(&pc
);
2295 return idetape_queue_pc_tail(drive
, &pc
);
2298 if (mt_count
< tape
->blk_size
||
2299 mt_count
% tape
->blk_size
)
2301 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
2302 clear_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
);
2304 set_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
);
2307 ide_tape_discard_merge_buffer(drive
, 0);
2308 return idetape_position_tape(drive
,
2309 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
2311 ide_tape_discard_merge_buffer(drive
, 0);
2312 return idetape_position_tape(drive
, 0, mt_count
, 0);
2316 if (!idetape_create_prevent_cmd(drive
, &pc
, 1))
2318 retval
= idetape_queue_pc_tail(drive
, &pc
);
2321 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
2324 if (!idetape_create_prevent_cmd(drive
, &pc
, 0))
2326 retval
= idetape_queue_pc_tail(drive
, &pc
);
2329 tape
->door_locked
= DOOR_UNLOCKED
;
2332 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
2339 * Our character device ioctls. General mtio.h magnetic io commands are
2340 * supported here, and not in the corresponding block interface. Our own
2341 * ide-tape ioctls are supported on both interfaces.
2343 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
2344 unsigned int cmd
, unsigned long arg
)
2346 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2347 ide_drive_t
*drive
= tape
->drive
;
2351 int block_offset
= 0, position
= tape
->first_frame
;
2352 void __user
*argp
= (void __user
*)arg
;
2354 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
2356 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
2357 ide_tape_flush_merge_buffer(drive
);
2358 idetape_flush_tape_buffers(drive
);
2360 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
2361 block_offset
= tape
->merge_bh_size
/
2362 (tape
->blk_size
* tape
->user_bs_factor
);
2363 position
= idetape_read_position(drive
);
2369 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
2371 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
2373 memset(&mtget
, 0, sizeof(struct mtget
));
2374 mtget
.mt_type
= MT_ISSCSI2
;
2375 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
2377 ((tape
->blk_size
* tape
->user_bs_factor
)
2378 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
2380 if (tape
->drv_write_prot
)
2381 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
2383 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
2387 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
2388 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
2392 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
2393 ide_tape_discard_merge_buffer(drive
, 1);
2394 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
2399 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
2400 * block size with the reported value.
2402 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
2404 idetape_tape_t
*tape
= drive
->driver_data
;
2405 struct ide_atapi_pc pc
;
2407 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
2408 if (idetape_queue_pc_tail(drive
, &pc
)) {
2409 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
2410 if (tape
->blk_size
== 0) {
2411 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
2412 "block size, assuming 32k\n");
2413 tape
->blk_size
= 32768;
2417 tape
->blk_size
= (pc
.buf
[4 + 5] << 16) +
2418 (pc
.buf
[4 + 6] << 8) +
2420 tape
->drv_write_prot
= (pc
.buf
[2] & 0x80) >> 7;
2423 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
2425 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
2427 idetape_tape_t
*tape
;
2428 struct ide_atapi_pc pc
;
2431 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
2434 tape
= ide_tape_chrdev_get(i
);
2438 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2441 * We really want to do nonseekable_open(inode, filp); here, but some
2442 * versions of tar incorrectly call lseek on tapes and bail out if that
2443 * fails. So we disallow pread() and pwrite(), but permit lseeks.
2445 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
2447 drive
= tape
->drive
;
2449 filp
->private_data
= tape
;
2451 if (test_and_set_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
)) {
2456 retval
= idetape_wait_ready(drive
, 60 * HZ
);
2458 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2459 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
2463 idetape_read_position(drive
);
2464 if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
))
2465 (void)idetape_rewind_tape(drive
);
2467 /* Read block size and write protect status from drive. */
2468 ide_tape_get_bsize_from_bdesc(drive
);
2470 /* Set write protect flag if device is opened as read-only. */
2471 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
2472 tape
->write_prot
= 1;
2474 tape
->write_prot
= tape
->drv_write_prot
;
2476 /* Make sure drive isn't write protected if user wants to write. */
2477 if (tape
->write_prot
) {
2478 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
2479 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
2480 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2486 /* Lock the tape drive door so user can't eject. */
2487 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2488 if (idetape_create_prevent_cmd(drive
, &pc
, 1)) {
2489 if (!idetape_queue_pc_tail(drive
, &pc
)) {
2490 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
2491 tape
->door_locked
= DOOR_LOCKED
;
2502 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
2504 idetape_tape_t
*tape
= drive
->driver_data
;
2506 ide_tape_flush_merge_buffer(drive
);
2507 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 1, 0);
2508 if (tape
->merge_bh
!= NULL
) {
2509 idetape_pad_zeros(drive
, tape
->blk_size
*
2510 (tape
->user_bs_factor
- 1));
2511 ide_tape_kfree_buffer(tape
);
2512 tape
->merge_bh
= NULL
;
2514 idetape_write_filemark(drive
);
2515 idetape_flush_tape_buffers(drive
);
2516 idetape_flush_tape_buffers(drive
);
2519 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
2521 struct ide_tape_obj
*tape
= ide_tape_f(filp
);
2522 ide_drive_t
*drive
= tape
->drive
;
2523 struct ide_atapi_pc pc
;
2524 unsigned int minor
= iminor(inode
);
2527 tape
= drive
->driver_data
;
2529 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2531 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
2532 idetape_write_release(drive
, minor
);
2533 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
2535 ide_tape_discard_merge_buffer(drive
, 1);
2538 if (minor
< 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
))
2539 (void) idetape_rewind_tape(drive
);
2540 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2541 if (tape
->door_locked
== DOOR_LOCKED
) {
2542 if (idetape_create_prevent_cmd(drive
, &pc
, 0)) {
2543 if (!idetape_queue_pc_tail(drive
, &pc
))
2544 tape
->door_locked
= DOOR_UNLOCKED
;
2548 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2555 * check the contents of the ATAPI IDENTIFY command results. We return:
2557 * 1 - If the tape can be supported by us, based on the information we have so
2560 * 0 - If this tape driver is not currently supported by us.
2562 static int idetape_identify_device(ide_drive_t
*drive
)
2564 u8 gcw
[2], protocol
, device_type
, removable
, packet_size
;
2566 if (drive
->id_read
== 0)
2569 *((unsigned short *) &gcw
) = drive
->id
->config
;
2571 protocol
= (gcw
[1] & 0xC0) >> 6;
2572 device_type
= gcw
[1] & 0x1F;
2573 removable
= !!(gcw
[0] & 0x80);
2574 packet_size
= gcw
[0] & 0x3;
2576 /* Check that we can support this device */
2578 printk(KERN_ERR
"ide-tape: Protocol (0x%02x) is not ATAPI\n",
2580 else if (device_type
!= 1)
2581 printk(KERN_ERR
"ide-tape: Device type (0x%02x) is not set "
2582 "to tape\n", device_type
);
2583 else if (!removable
)
2584 printk(KERN_ERR
"ide-tape: The removable flag is not set\n");
2585 else if (packet_size
!= 0) {
2586 printk(KERN_ERR
"ide-tape: Packet size (0x%02x) is not 12"
2587 " bytes\n", packet_size
);
2593 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
2595 idetape_tape_t
*tape
= drive
->driver_data
;
2596 struct ide_atapi_pc pc
;
2597 char fw_rev
[6], vendor_id
[10], product_id
[18];
2599 idetape_create_inquiry_cmd(&pc
);
2600 if (idetape_queue_pc_tail(drive
, &pc
)) {
2601 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
2605 memcpy(vendor_id
, &pc
.buf
[8], 8);
2606 memcpy(product_id
, &pc
.buf
[16], 16);
2607 memcpy(fw_rev
, &pc
.buf
[32], 4);
2609 ide_fixstring(vendor_id
, 10, 0);
2610 ide_fixstring(product_id
, 18, 0);
2611 ide_fixstring(fw_rev
, 6, 0);
2613 printk(KERN_INFO
"ide-tape: %s <-> %s: %s %s rev %s\n",
2614 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
2618 * Ask the tape about its various parameters. In particular, we will adjust our
2619 * data transfer buffer size to the recommended value as returned by the tape.
2621 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
2623 idetape_tape_t
*tape
= drive
->driver_data
;
2624 struct ide_atapi_pc pc
;
2626 u8 speed
, max_speed
;
2628 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
2629 if (idetape_queue_pc_tail(drive
, &pc
)) {
2630 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
2631 " some default values\n");
2632 tape
->blk_size
= 512;
2633 put_unaligned(52, (u16
*)&tape
->caps
[12]);
2634 put_unaligned(540, (u16
*)&tape
->caps
[14]);
2635 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
2638 caps
= pc
.buf
+ 4 + pc
.buf
[3];
2640 /* convert to host order and save for later use */
2641 speed
= be16_to_cpu(*(u16
*)&caps
[14]);
2642 max_speed
= be16_to_cpu(*(u16
*)&caps
[8]);
2644 put_unaligned(max_speed
, (u16
*)&caps
[8]);
2645 put_unaligned(be16_to_cpu(*(u16
*)&caps
[12]), (u16
*)&caps
[12]);
2646 put_unaligned(speed
, (u16
*)&caps
[14]);
2647 put_unaligned(be16_to_cpu(*(u16
*)&caps
[16]), (u16
*)&caps
[16]);
2650 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
2651 "(assuming 650KB/sec)\n", drive
->name
);
2652 put_unaligned(650, (u16
*)&caps
[14]);
2655 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
2656 "(assuming 650KB/sec)\n", drive
->name
);
2657 put_unaligned(650, (u16
*)&caps
[8]);
2660 memcpy(&tape
->caps
, caps
, 20);
2662 tape
->blk_size
= 512;
2663 else if (caps
[7] & 0x04)
2664 tape
->blk_size
= 1024;
2667 #ifdef CONFIG_IDE_PROC_FS
2668 static void idetape_add_settings(ide_drive_t
*drive
)
2670 idetape_tape_t
*tape
= drive
->driver_data
;
2672 ide_add_setting(drive
, "buffer", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
2673 1, 2, (u16
*)&tape
->caps
[16], NULL
);
2674 ide_add_setting(drive
, "speed", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
2675 1, 1, (u16
*)&tape
->caps
[14], NULL
);
2676 ide_add_setting(drive
, "buffer_size", SETTING_READ
, TYPE_INT
, 0, 0xffff,
2677 1, 1024, &tape
->buffer_size
, NULL
);
2678 ide_add_setting(drive
, "tdsc", SETTING_RW
, TYPE_INT
, IDETAPE_DSC_RW_MIN
,
2679 IDETAPE_DSC_RW_MAX
, 1000, HZ
, &tape
->best_dsc_rw_freq
,
2681 ide_add_setting(drive
, "dsc_overlap", SETTING_RW
, TYPE_BYTE
, 0, 1, 1,
2682 1, &drive
->dsc_overlap
, NULL
);
2683 ide_add_setting(drive
, "avg_speed", SETTING_READ
, TYPE_INT
, 0, 0xffff,
2684 1, 1, &tape
->avg_speed
, NULL
);
2685 ide_add_setting(drive
, "debug_mask", SETTING_RW
, TYPE_INT
, 0, 0xffff, 1,
2686 1, &tape
->debug_mask
, NULL
);
2689 static inline void idetape_add_settings(ide_drive_t
*drive
) { ; }
2693 * The function below is called to:
2695 * 1. Initialize our various state variables.
2696 * 2. Ask the tape for its capabilities.
2697 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2698 * is chosen based on the recommendation which we received in step 2.
2700 * Note that at this point ide.c already assigned us an irq, so that we can
2701 * queue requests here and wait for their completion.
2703 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
2709 u16
*ctl
= (u16
*)&tape
->caps
[12];
2711 spin_lock_init(&tape
->lock
);
2712 drive
->dsc_overlap
= 1;
2713 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
2714 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
2716 drive
->dsc_overlap
= 0;
2718 /* Seagate Travan drives do not support DSC overlap. */
2719 if (strstr(drive
->id
->model
, "Seagate STT3401"))
2720 drive
->dsc_overlap
= 0;
2721 tape
->minor
= minor
;
2722 tape
->name
[0] = 'h';
2723 tape
->name
[1] = 't';
2724 tape
->name
[2] = '0' + minor
;
2725 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2726 tape
->pc
= tape
->pc_stack
;
2727 *((unsigned short *) &gcw
) = drive
->id
->config
;
2729 /* Command packet DRQ type */
2730 if (((gcw
[0] & 0x60) >> 5) == 1)
2731 set_bit(IDETAPE_FLAG_DRQ_INTERRUPT
, &tape
->flags
);
2733 idetape_get_inquiry_results(drive
);
2734 idetape_get_mode_sense_results(drive
);
2735 ide_tape_get_bsize_from_bdesc(drive
);
2736 tape
->user_bs_factor
= 1;
2737 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2738 while (tape
->buffer_size
> 0xffff) {
2739 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
2741 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2743 buffer_size
= tape
->buffer_size
;
2744 tape
->pages_per_buffer
= buffer_size
/ PAGE_SIZE
;
2745 if (buffer_size
% PAGE_SIZE
) {
2746 tape
->pages_per_buffer
++;
2747 tape
->excess_bh_size
= PAGE_SIZE
- buffer_size
% PAGE_SIZE
;
2750 /* select the "best" DSC read/write polling freq */
2751 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
2753 t
= (IDETAPE_FIFO_THRESHOLD
* tape
->buffer_size
* HZ
) / (speed
* 1000);
2756 * Ensure that the number we got makes sense; limit it within
2757 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2759 tape
->best_dsc_rw_freq
= clamp_t(unsigned long, t
, IDETAPE_DSC_RW_MIN
,
2760 IDETAPE_DSC_RW_MAX
);
2761 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2763 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
2764 (*(u16
*)&tape
->caps
[16] * 512) / tape
->buffer_size
,
2765 tape
->buffer_size
/ 1024,
2766 tape
->best_dsc_rw_freq
* 1000 / HZ
,
2767 drive
->using_dma
? ", DMA":"");
2769 idetape_add_settings(drive
);
2772 static void ide_tape_remove(ide_drive_t
*drive
)
2774 idetape_tape_t
*tape
= drive
->driver_data
;
2776 ide_proc_unregister_driver(drive
, tape
->driver
);
2778 ide_unregister_region(tape
->disk
);
2783 static void ide_tape_release(struct kref
*kref
)
2785 struct ide_tape_obj
*tape
= to_ide_tape(kref
);
2786 ide_drive_t
*drive
= tape
->drive
;
2787 struct gendisk
*g
= tape
->disk
;
2789 BUG_ON(tape
->merge_bh_size
);
2791 drive
->dsc_overlap
= 0;
2792 drive
->driver_data
= NULL
;
2793 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
2794 device_destroy(idetape_sysfs_class
,
2795 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
2796 idetape_devs
[tape
->minor
] = NULL
;
2797 g
->private_data
= NULL
;
2802 #ifdef CONFIG_IDE_PROC_FS
2803 static int proc_idetape_read_name
2804 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
2806 ide_drive_t
*drive
= (ide_drive_t
*) data
;
2807 idetape_tape_t
*tape
= drive
->driver_data
;
2811 len
= sprintf(out
, "%s\n", tape
->name
);
2812 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
2815 static ide_proc_entry_t idetape_proc
[] = {
2816 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
2817 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
2818 { NULL
, 0, NULL
, NULL
}
2822 static int ide_tape_probe(ide_drive_t
*);
2824 static ide_driver_t idetape_driver
= {
2826 .owner
= THIS_MODULE
,
2828 .bus
= &ide_bus_type
,
2830 .probe
= ide_tape_probe
,
2831 .remove
= ide_tape_remove
,
2832 .version
= IDETAPE_VERSION
,
2834 .supports_dsc_overlap
= 1,
2835 .do_request
= idetape_do_request
,
2836 .end_request
= idetape_end_request
,
2837 .error
= __ide_error
,
2838 .abort
= __ide_abort
,
2839 #ifdef CONFIG_IDE_PROC_FS
2840 .proc
= idetape_proc
,
2844 /* Our character device supporting functions, passed to register_chrdev. */
2845 static const struct file_operations idetape_fops
= {
2846 .owner
= THIS_MODULE
,
2847 .read
= idetape_chrdev_read
,
2848 .write
= idetape_chrdev_write
,
2849 .ioctl
= idetape_chrdev_ioctl
,
2850 .open
= idetape_chrdev_open
,
2851 .release
= idetape_chrdev_release
,
2854 static int idetape_open(struct inode
*inode
, struct file
*filp
)
2856 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
2857 struct ide_tape_obj
*tape
;
2859 tape
= ide_tape_get(disk
);
2866 static int idetape_release(struct inode
*inode
, struct file
*filp
)
2868 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
2869 struct ide_tape_obj
*tape
= ide_tape_g(disk
);
2876 static int idetape_ioctl(struct inode
*inode
, struct file
*file
,
2877 unsigned int cmd
, unsigned long arg
)
2879 struct block_device
*bdev
= inode
->i_bdev
;
2880 struct ide_tape_obj
*tape
= ide_tape_g(bdev
->bd_disk
);
2881 ide_drive_t
*drive
= tape
->drive
;
2882 int err
= generic_ide_ioctl(drive
, file
, bdev
, cmd
, arg
);
2884 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
2888 static struct block_device_operations idetape_block_ops
= {
2889 .owner
= THIS_MODULE
,
2890 .open
= idetape_open
,
2891 .release
= idetape_release
,
2892 .ioctl
= idetape_ioctl
,
2895 static int ide_tape_probe(ide_drive_t
*drive
)
2897 idetape_tape_t
*tape
;
2901 if (!strstr("ide-tape", drive
->driver_req
))
2903 if (!drive
->present
)
2905 if (drive
->media
!= ide_tape
)
2907 if (!idetape_identify_device(drive
)) {
2908 printk(KERN_ERR
"ide-tape: %s: not supported by this version of"
2909 " the driver\n", drive
->name
);
2913 printk(KERN_INFO
"ide-tape: passing drive %s to ide-scsi"
2914 " emulation.\n", drive
->name
);
2917 tape
= kzalloc(sizeof(idetape_tape_t
), GFP_KERNEL
);
2919 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape struct\n",
2924 g
= alloc_disk(1 << PARTN_BITS
);
2928 ide_init_disk(g
, drive
);
2930 ide_proc_register_driver(drive
, &idetape_driver
);
2932 kref_init(&tape
->kref
);
2934 tape
->drive
= drive
;
2935 tape
->driver
= &idetape_driver
;
2938 g
->private_data
= &tape
->driver
;
2940 drive
->driver_data
= tape
;
2942 mutex_lock(&idetape_ref_mutex
);
2943 for (minor
= 0; idetape_devs
[minor
]; minor
++)
2945 idetape_devs
[minor
] = tape
;
2946 mutex_unlock(&idetape_ref_mutex
);
2948 idetape_setup(drive
, tape
, minor
);
2950 device_create(idetape_sysfs_class
, &drive
->gendev
,
2951 MKDEV(IDETAPE_MAJOR
, minor
), "%s", tape
->name
);
2952 device_create(idetape_sysfs_class
, &drive
->gendev
,
2953 MKDEV(IDETAPE_MAJOR
, minor
+ 128), "n%s", tape
->name
);
2955 g
->fops
= &idetape_block_ops
;
2956 ide_register_region(g
);
2966 static void __exit
idetape_exit(void)
2968 driver_unregister(&idetape_driver
.gen_driver
);
2969 class_destroy(idetape_sysfs_class
);
2970 unregister_chrdev(IDETAPE_MAJOR
, "ht");
2973 static int __init
idetape_init(void)
2976 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
2977 if (IS_ERR(idetape_sysfs_class
)) {
2978 idetape_sysfs_class
= NULL
;
2979 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
2984 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
2985 printk(KERN_ERR
"ide-tape: Failed to register chrdev"
2988 goto out_free_class
;
2991 error
= driver_register(&idetape_driver
.gen_driver
);
2993 goto out_free_driver
;
2998 driver_unregister(&idetape_driver
.gen_driver
);
3000 class_destroy(idetape_sysfs_class
);
3005 MODULE_ALIAS("ide:*m-tape*");
3006 module_init(idetape_init
);
3007 module_exit(idetape_exit
);
3008 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);
3009 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
3010 MODULE_LICENSE("GPL");