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 (void) ide_do_drive_cmd(drive
, rq
, ide_preempt
);
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
;
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");
845 printk(KERN_ERR
"ide-tape: DMA disabled, reverting to PIO\n");
847 return ide_do_reset(drive
);
849 /* Get the number of bytes to transfer on this interrupt. */
850 bcount
= (hwif
->INB(hwif
->io_ports
.lbah_addr
) << 8) |
851 hwif
->INB(hwif
->io_ports
.lbam_addr
);
853 ireason
= hwif
->INB(hwif
->io_ports
.nsect_addr
);
856 printk(KERN_ERR
"ide-tape: CoD != 0 in %s\n", __func__
);
857 return ide_do_reset(drive
);
859 if (((ireason
& IO
) == IO
) == !!(pc
->flags
& PC_FLAG_WRITING
)) {
860 /* Hopefully, we will never get here */
861 printk(KERN_ERR
"ide-tape: We wanted to %s, ",
862 (ireason
& IO
) ? "Write" : "Read");
863 printk(KERN_ERR
"ide-tape: but the tape wants us to %s !\n",
864 (ireason
& IO
) ? "Read" : "Write");
865 return ide_do_reset(drive
);
867 if (!(pc
->flags
& PC_FLAG_WRITING
)) {
868 /* Reading - Check that we have enough space */
869 temp
= pc
->xferred
+ bcount
;
870 if (temp
> pc
->req_xfer
) {
871 if (temp
> pc
->buf_size
) {
872 printk(KERN_ERR
"ide-tape: The tape wants to "
873 "send us more data than expected "
874 "- discarding data\n");
875 ide_pad_transfer(drive
, 0, bcount
);
876 ide_set_handler(drive
, &idetape_pc_intr
,
877 IDETAPE_WAIT_CMD
, NULL
);
880 debug_log(DBG_SENSE
, "The tape wants to send us more "
881 "data than expected - allowing transfer\n");
883 iobuf
= &idetape_input_buffers
;
884 xferfunc
= hwif
->input_data
;
886 iobuf
= &idetape_output_buffers
;
887 xferfunc
= hwif
->output_data
;
891 iobuf(drive
, pc
, bcount
);
893 xferfunc(drive
, NULL
, pc
->cur_pos
, bcount
);
895 /* Update the current position */
896 pc
->xferred
+= bcount
;
897 pc
->cur_pos
+= bcount
;
899 debug_log(DBG_SENSE
, "[cmd %x] transferred %d bytes on that intr.\n",
902 /* And set the interrupt handler again */
903 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
908 * Packet Command Interface
910 * The current Packet Command is available in tape->pc, and will not change
911 * until we finish handling it. Each packet command is associated with a
912 * callback function that will be called when the command is finished.
914 * The handling will be done in three stages:
916 * 1. idetape_issue_pc will send the packet command to the drive, and will set
917 * the interrupt handler to idetape_pc_intr.
919 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
920 * repeated until the device signals us that no more interrupts will be issued.
922 * 3. ATAPI Tape media access commands have immediate status with a delayed
923 * process. In case of a successful initiation of a media access packet command,
924 * the DSC bit will be set when the actual execution of the command is finished.
925 * Since the tape drive will not issue an interrupt, we have to poll for this
926 * event. In this case, we define the request as "low priority request" by
927 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
930 * ide.c will then give higher priority to requests which originate from the
931 * other device, until will change rq_status to RQ_ACTIVE.
933 * 4. When the packet command is finished, it will be checked for errors.
935 * 5. In case an error was found, we queue a request sense packet command in
936 * front of the request queue and retry the operation up to
937 * IDETAPE_MAX_PC_RETRIES times.
939 * 6. In case no error was found, or we decided to give up and not to retry
940 * again, the callback function will be called and then we will handle the next
943 static ide_startstop_t
idetape_transfer_pc(ide_drive_t
*drive
)
945 ide_hwif_t
*hwif
= drive
->hwif
;
946 idetape_tape_t
*tape
= drive
->driver_data
;
947 struct ide_atapi_pc
*pc
= tape
->pc
;
949 ide_startstop_t startstop
;
952 if (ide_wait_stat(&startstop
, drive
, DRQ_STAT
, BUSY_STAT
, WAIT_READY
)) {
953 printk(KERN_ERR
"ide-tape: Strange, packet command initiated "
954 "yet DRQ isn't asserted\n");
957 ireason
= hwif
->INB(hwif
->io_ports
.nsect_addr
);
958 while (retries
-- && ((ireason
& CD
) == 0 || (ireason
& IO
))) {
959 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while issuing "
960 "a packet command, retrying\n");
962 ireason
= hwif
->INB(hwif
->io_ports
.nsect_addr
);
964 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while "
965 "issuing a packet command, ignoring\n");
970 if ((ireason
& CD
) == 0 || (ireason
& IO
)) {
971 printk(KERN_ERR
"ide-tape: (IO,CoD) != (0,1) while issuing "
972 "a packet command\n");
973 return ide_do_reset(drive
);
975 /* Set the interrupt routine */
976 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
977 #ifdef CONFIG_BLK_DEV_IDEDMA
978 /* Begin DMA, if necessary */
979 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
)
980 hwif
->dma_ops
->dma_start(drive
);
982 /* Send the actual packet */
983 hwif
->output_data(drive
, NULL
, pc
->c
, 12);
988 static ide_startstop_t
idetape_issue_pc(ide_drive_t
*drive
,
989 struct ide_atapi_pc
*pc
)
991 ide_hwif_t
*hwif
= drive
->hwif
;
992 idetape_tape_t
*tape
= drive
->driver_data
;
996 if (tape
->pc
->c
[0] == REQUEST_SENSE
&&
997 pc
->c
[0] == REQUEST_SENSE
) {
998 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
999 "Two request sense in serial were issued\n");
1002 if (tape
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
1003 tape
->failed_pc
= pc
;
1004 /* Set the current packet command */
1007 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
1008 (pc
->flags
& PC_FLAG_ABORT
)) {
1010 * We will "abort" retrying a packet command in case legitimate
1011 * error code was received (crossing a filemark, or end of the
1012 * media, for example).
1014 if (!(pc
->flags
& PC_FLAG_ABORT
)) {
1015 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
1016 tape
->sense_key
== 2 && tape
->asc
== 4 &&
1017 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
1018 printk(KERN_ERR
"ide-tape: %s: I/O error, "
1019 "pc = %2x, key = %2x, "
1020 "asc = %2x, ascq = %2x\n",
1021 tape
->name
, pc
->c
[0],
1022 tape
->sense_key
, tape
->asc
,
1026 pc
->error
= IDETAPE_ERROR_GENERAL
;
1028 tape
->failed_pc
= NULL
;
1029 return pc
->idetape_callback(drive
);
1031 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
1034 /* We haven't transferred any data yet */
1036 pc
->cur_pos
= pc
->buf
;
1037 /* Request to transfer the entire buffer at once */
1038 bcount
= pc
->req_xfer
;
1040 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
1041 pc
->flags
&= ~PC_FLAG_DMA_ERROR
;
1042 printk(KERN_WARNING
"ide-tape: DMA disabled, "
1043 "reverting to PIO\n");
1046 if ((pc
->flags
& PC_FLAG_DMA_RECOMMENDED
) && drive
->using_dma
)
1047 dma_ok
= !hwif
->dma_ops
->dma_setup(drive
);
1049 ide_pktcmd_tf_load(drive
, IDE_TFLAG_NO_SELECT_MASK
|
1050 IDE_TFLAG_OUT_DEVICE
, bcount
, dma_ok
);
1053 /* Will begin DMA later */
1054 pc
->flags
|= PC_FLAG_DMA_IN_PROGRESS
;
1055 if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT
, &tape
->flags
)) {
1056 ide_execute_command(drive
, WIN_PACKETCMD
, &idetape_transfer_pc
,
1057 IDETAPE_WAIT_CMD
, NULL
);
1060 ide_execute_pkt_cmd(drive
);
1061 return idetape_transfer_pc(drive
);
1065 static ide_startstop_t
idetape_pc_callback(ide_drive_t
*drive
)
1067 idetape_tape_t
*tape
= drive
->driver_data
;
1069 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1071 idetape_end_request(drive
, tape
->pc
->error
? 0 : 1, 0);
1075 /* A mode sense command is used to "sense" tape parameters. */
1076 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc
*pc
, u8 page_code
)
1078 idetape_init_pc(pc
);
1079 pc
->c
[0] = MODE_SENSE
;
1080 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
1081 /* DBD = 1 - Don't return block descriptors */
1083 pc
->c
[2] = page_code
;
1085 * Changed pc->c[3] to 0 (255 will at best return unused info).
1087 * For SCSI this byte is defined as subpage instead of high byte
1088 * of length and some IDE drives seem to interpret it this way
1089 * and return an error when 255 is used.
1092 /* We will just discard data in that case */
1094 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
1096 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
1100 pc
->idetape_callback
= &idetape_pc_callback
;
1103 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
1105 idetape_tape_t
*tape
= drive
->driver_data
;
1106 struct ide_atapi_pc
*pc
= tape
->pc
;
1109 stat
= ide_read_status(drive
);
1111 if (stat
& SEEK_STAT
) {
1112 if (stat
& ERR_STAT
) {
1113 /* Error detected */
1114 if (pc
->c
[0] != TEST_UNIT_READY
)
1115 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
1117 /* Retry operation */
1118 return idetape_retry_pc(drive
);
1121 if (tape
->failed_pc
== pc
)
1122 tape
->failed_pc
= NULL
;
1124 pc
->error
= IDETAPE_ERROR_GENERAL
;
1125 tape
->failed_pc
= NULL
;
1127 return pc
->idetape_callback(drive
);
1130 static ide_startstop_t
idetape_rw_callback(ide_drive_t
*drive
)
1132 idetape_tape_t
*tape
= drive
->driver_data
;
1133 struct request
*rq
= HWGROUP(drive
)->rq
;
1134 int blocks
= tape
->pc
->xferred
/ tape
->blk_size
;
1136 tape
->avg_size
+= blocks
* tape
->blk_size
;
1138 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
1139 tape
->avg_speed
= tape
->avg_size
* HZ
/
1140 (jiffies
- tape
->avg_time
) / 1024;
1142 tape
->avg_time
= jiffies
;
1144 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1146 tape
->first_frame
+= blocks
;
1147 rq
->current_nr_sectors
-= blocks
;
1149 if (!tape
->pc
->error
)
1150 idetape_end_request(drive
, 1, 0);
1152 idetape_end_request(drive
, tape
->pc
->error
, 0);
1156 static void idetape_create_read_cmd(idetape_tape_t
*tape
,
1157 struct ide_atapi_pc
*pc
,
1158 unsigned int length
, struct idetape_bh
*bh
)
1160 idetape_init_pc(pc
);
1162 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1164 pc
->idetape_callback
= &idetape_rw_callback
;
1166 atomic_set(&bh
->b_count
, 0);
1168 pc
->buf_size
= length
* tape
->blk_size
;
1169 pc
->req_xfer
= pc
->buf_size
;
1170 if (pc
->req_xfer
== tape
->buffer_size
)
1171 pc
->flags
|= PC_FLAG_DMA_RECOMMENDED
;
1174 static void idetape_create_write_cmd(idetape_tape_t
*tape
,
1175 struct ide_atapi_pc
*pc
,
1176 unsigned int length
, struct idetape_bh
*bh
)
1178 idetape_init_pc(pc
);
1180 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1182 pc
->idetape_callback
= &idetape_rw_callback
;
1183 pc
->flags
|= PC_FLAG_WRITING
;
1185 pc
->b_data
= bh
->b_data
;
1186 pc
->b_count
= atomic_read(&bh
->b_count
);
1188 pc
->buf_size
= length
* tape
->blk_size
;
1189 pc
->req_xfer
= pc
->buf_size
;
1190 if (pc
->req_xfer
== tape
->buffer_size
)
1191 pc
->flags
|= PC_FLAG_DMA_RECOMMENDED
;
1194 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
1195 struct request
*rq
, sector_t block
)
1197 idetape_tape_t
*tape
= drive
->driver_data
;
1198 struct ide_atapi_pc
*pc
= NULL
;
1199 struct request
*postponed_rq
= tape
->postponed_rq
;
1202 debug_log(DBG_SENSE
, "sector: %ld, nr_sectors: %ld,"
1203 " current_nr_sectors: %d\n",
1204 rq
->sector
, rq
->nr_sectors
, rq
->current_nr_sectors
);
1206 if (!blk_special_request(rq
)) {
1207 /* We do not support buffer cache originated requests. */
1208 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
1209 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
1210 ide_end_request(drive
, 0, 0);
1214 /* Retry a failed packet command */
1215 if (tape
->failed_pc
&& tape
->pc
->c
[0] == REQUEST_SENSE
)
1216 return idetape_issue_pc(drive
, tape
->failed_pc
);
1218 if (postponed_rq
!= NULL
)
1219 if (rq
!= postponed_rq
) {
1220 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
1221 "Two DSC requests were queued\n");
1222 idetape_end_request(drive
, 0, 0);
1226 tape
->postponed_rq
= NULL
;
1229 * If the tape is still busy, postpone our request and service
1230 * the other device meanwhile.
1232 stat
= ide_read_status(drive
);
1234 if (!drive
->dsc_overlap
&& !(rq
->cmd
[0] & REQ_IDETAPE_PC2
))
1235 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
1237 if (drive
->post_reset
== 1) {
1238 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
1239 drive
->post_reset
= 0;
1242 if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
) &&
1243 (stat
& SEEK_STAT
) == 0) {
1244 if (postponed_rq
== NULL
) {
1245 tape
->dsc_polling_start
= jiffies
;
1246 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
1247 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
1248 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
1249 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
1251 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1252 idetape_media_access_finished(drive
);
1255 return ide_do_reset(drive
);
1257 } else if (time_after(jiffies
,
1258 tape
->dsc_polling_start
+
1259 IDETAPE_DSC_MA_THRESHOLD
))
1260 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
1261 idetape_postpone_request(drive
);
1264 if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1265 pc
= idetape_next_pc_storage(drive
);
1266 idetape_create_read_cmd(tape
, pc
, rq
->current_nr_sectors
,
1267 (struct idetape_bh
*)rq
->special
);
1270 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1271 pc
= idetape_next_pc_storage(drive
);
1272 idetape_create_write_cmd(tape
, pc
, rq
->current_nr_sectors
,
1273 (struct idetape_bh
*)rq
->special
);
1276 if (rq
->cmd
[0] & REQ_IDETAPE_PC1
) {
1277 pc
= (struct ide_atapi_pc
*) rq
->buffer
;
1278 rq
->cmd
[0] &= ~(REQ_IDETAPE_PC1
);
1279 rq
->cmd
[0] |= REQ_IDETAPE_PC2
;
1282 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1283 idetape_media_access_finished(drive
);
1288 return idetape_issue_pc(drive
, pc
);
1292 * The function below uses __get_free_pages to allocate a data buffer of size
1293 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
1296 * It returns a pointer to the newly allocated buffer, or NULL in case of
1299 static struct idetape_bh
*ide_tape_kmalloc_buffer(idetape_tape_t
*tape
,
1300 int full
, int clear
)
1302 struct idetape_bh
*prev_bh
, *bh
, *merge_bh
;
1303 int pages
= tape
->pages_per_buffer
;
1304 unsigned int order
, b_allocd
;
1305 char *b_data
= NULL
;
1307 merge_bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1312 order
= fls(pages
) - 1;
1313 bh
->b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
1316 b_allocd
= (1 << order
) * PAGE_SIZE
;
1320 memset(bh
->b_data
, 0, b_allocd
);
1321 bh
->b_reqnext
= NULL
;
1322 bh
->b_size
= b_allocd
;
1323 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1326 order
= fls(pages
) - 1;
1327 b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
1330 b_allocd
= (1 << order
) * PAGE_SIZE
;
1333 memset(b_data
, 0, b_allocd
);
1335 /* newly allocated page frames below buffer header or ...*/
1336 if (bh
->b_data
== b_data
+ b_allocd
) {
1337 bh
->b_size
+= b_allocd
;
1338 bh
->b_data
-= b_allocd
;
1340 atomic_add(b_allocd
, &bh
->b_count
);
1343 /* they are above the header */
1344 if (b_data
== bh
->b_data
+ bh
->b_size
) {
1345 bh
->b_size
+= b_allocd
;
1347 atomic_add(b_allocd
, &bh
->b_count
);
1351 bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1353 free_pages((unsigned long) b_data
, order
);
1356 bh
->b_reqnext
= NULL
;
1357 bh
->b_data
= b_data
;
1358 bh
->b_size
= b_allocd
;
1359 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1360 prev_bh
->b_reqnext
= bh
;
1365 bh
->b_size
-= tape
->excess_bh_size
;
1367 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
1370 ide_tape_kfree_buffer(tape
);
1374 static int idetape_copy_stage_from_user(idetape_tape_t
*tape
,
1375 const char __user
*buf
, int n
)
1377 struct idetape_bh
*bh
= tape
->bh
;
1383 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1387 count
= min((unsigned int)
1388 (bh
->b_size
- atomic_read(&bh
->b_count
)),
1390 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
,
1394 atomic_add(count
, &bh
->b_count
);
1396 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
1399 atomic_set(&bh
->b_count
, 0);
1406 static int idetape_copy_stage_to_user(idetape_tape_t
*tape
, char __user
*buf
,
1409 struct idetape_bh
*bh
= tape
->bh
;
1415 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1419 count
= min(tape
->b_count
, n
);
1420 if (copy_to_user(buf
, tape
->b_data
, count
))
1423 tape
->b_data
+= count
;
1424 tape
->b_count
-= count
;
1426 if (!tape
->b_count
) {
1430 tape
->b_data
= bh
->b_data
;
1431 tape
->b_count
= atomic_read(&bh
->b_count
);
1438 static void idetape_init_merge_buffer(idetape_tape_t
*tape
)
1440 struct idetape_bh
*bh
= tape
->merge_bh
;
1441 tape
->bh
= tape
->merge_bh
;
1443 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1444 atomic_set(&bh
->b_count
, 0);
1446 tape
->b_data
= bh
->b_data
;
1447 tape
->b_count
= atomic_read(&bh
->b_count
);
1451 static ide_startstop_t
idetape_read_position_callback(ide_drive_t
*drive
)
1453 idetape_tape_t
*tape
= drive
->driver_data
;
1454 u8
*readpos
= tape
->pc
->buf
;
1456 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1458 if (!tape
->pc
->error
) {
1459 debug_log(DBG_SENSE
, "BOP - %s\n",
1460 (readpos
[0] & 0x80) ? "Yes" : "No");
1461 debug_log(DBG_SENSE
, "EOP - %s\n",
1462 (readpos
[0] & 0x40) ? "Yes" : "No");
1464 if (readpos
[0] & 0x4) {
1465 printk(KERN_INFO
"ide-tape: Block location is unknown"
1467 clear_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
);
1468 idetape_end_request(drive
, 0, 0);
1470 debug_log(DBG_SENSE
, "Block Location - %u\n",
1471 be32_to_cpu(*(u32
*)&readpos
[4]));
1473 tape
->partition
= readpos
[1];
1475 be32_to_cpu(*(u32
*)&readpos
[4]);
1476 set_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
);
1477 idetape_end_request(drive
, 1, 0);
1480 idetape_end_request(drive
, 0, 0);
1486 * Write a filemark if write_filemark=1. Flush the device buffers without
1487 * writing a filemark otherwise.
1489 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
1490 struct ide_atapi_pc
*pc
, int write_filemark
)
1492 idetape_init_pc(pc
);
1493 pc
->c
[0] = WRITE_FILEMARKS
;
1494 pc
->c
[4] = write_filemark
;
1495 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1496 pc
->idetape_callback
= &idetape_pc_callback
;
1499 static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc
*pc
)
1501 idetape_init_pc(pc
);
1502 pc
->c
[0] = TEST_UNIT_READY
;
1503 pc
->idetape_callback
= &idetape_pc_callback
;
1507 * We add a special packet command request to the tail of the request queue, and
1508 * wait for it to be serviced. This is not to be called from within the request
1509 * handling part of the driver! We allocate here data on the stack and it is
1510 * valid until the request is finished. This is not the case for the bottom part
1511 * of the driver, where we are always leaving the functions to wait for an
1512 * interrupt or a timer event.
1514 * From the bottom part of the driver, we should allocate safe memory using
1515 * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request
1516 * to the request list without waiting for it to be serviced! In that case, we
1517 * usually use idetape_queue_pc_head().
1519 static int idetape_queue_pc_tail(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
)
1521 struct ide_tape_obj
*tape
= drive
->driver_data
;
1525 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
1526 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1527 rq
->cmd
[0] = REQ_IDETAPE_PC1
;
1528 rq
->buffer
= (char *)pc
;
1529 error
= blk_execute_rq(drive
->queue
, tape
->disk
, rq
, 0);
1530 blk_put_request(rq
);
1534 static void idetape_create_load_unload_cmd(ide_drive_t
*drive
,
1535 struct ide_atapi_pc
*pc
, int cmd
)
1537 idetape_init_pc(pc
);
1538 pc
->c
[0] = START_STOP
;
1540 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1541 pc
->idetape_callback
= &idetape_pc_callback
;
1544 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
1546 idetape_tape_t
*tape
= drive
->driver_data
;
1547 struct ide_atapi_pc pc
;
1548 int load_attempted
= 0;
1550 /* Wait for the tape to become ready */
1551 set_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
);
1553 while (time_before(jiffies
, timeout
)) {
1554 idetape_create_test_unit_ready_cmd(&pc
);
1555 if (!idetape_queue_pc_tail(drive
, &pc
))
1557 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
1558 || (tape
->asc
== 0x3A)) {
1562 idetape_create_load_unload_cmd(drive
, &pc
,
1563 IDETAPE_LU_LOAD_MASK
);
1564 idetape_queue_pc_tail(drive
, &pc
);
1566 /* not about to be ready */
1567 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
1568 (tape
->ascq
== 1 || tape
->ascq
== 8)))
1575 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
1577 struct ide_atapi_pc pc
;
1580 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
1581 rc
= idetape_queue_pc_tail(drive
, &pc
);
1584 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1588 static void idetape_create_read_position_cmd(struct ide_atapi_pc
*pc
)
1590 idetape_init_pc(pc
);
1591 pc
->c
[0] = READ_POSITION
;
1593 pc
->idetape_callback
= &idetape_read_position_callback
;
1596 static int idetape_read_position(ide_drive_t
*drive
)
1598 idetape_tape_t
*tape
= drive
->driver_data
;
1599 struct ide_atapi_pc pc
;
1602 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1604 idetape_create_read_position_cmd(&pc
);
1605 if (idetape_queue_pc_tail(drive
, &pc
))
1607 position
= tape
->first_frame
;
1611 static void idetape_create_locate_cmd(ide_drive_t
*drive
,
1612 struct ide_atapi_pc
*pc
,
1613 unsigned int block
, u8 partition
, int skip
)
1615 idetape_init_pc(pc
);
1616 pc
->c
[0] = POSITION_TO_ELEMENT
;
1618 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
1619 pc
->c
[8] = partition
;
1620 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1621 pc
->idetape_callback
= &idetape_pc_callback
;
1624 static int idetape_create_prevent_cmd(ide_drive_t
*drive
,
1625 struct ide_atapi_pc
*pc
, int prevent
)
1627 idetape_tape_t
*tape
= drive
->driver_data
;
1629 /* device supports locking according to capabilities page */
1630 if (!(tape
->caps
[6] & 0x01))
1633 idetape_init_pc(pc
);
1634 pc
->c
[0] = ALLOW_MEDIUM_REMOVAL
;
1636 pc
->idetape_callback
= &idetape_pc_callback
;
1640 static void __ide_tape_discard_merge_buffer(ide_drive_t
*drive
)
1642 idetape_tape_t
*tape
= drive
->driver_data
;
1644 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
1647 clear_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
);
1648 tape
->merge_bh_size
= 0;
1649 if (tape
->merge_bh
!= NULL
) {
1650 ide_tape_kfree_buffer(tape
);
1651 tape
->merge_bh
= NULL
;
1654 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1658 * Position the tape to the requested block using the LOCATE packet command.
1659 * A READ POSITION command is then issued to check where we are positioned. Like
1660 * all higher level operations, we queue the commands at the tail of the request
1661 * queue and wait for their completion.
1663 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
1664 u8 partition
, int skip
)
1666 idetape_tape_t
*tape
= drive
->driver_data
;
1668 struct ide_atapi_pc pc
;
1670 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1671 __ide_tape_discard_merge_buffer(drive
);
1672 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1673 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
1674 retval
= idetape_queue_pc_tail(drive
, &pc
);
1678 idetape_create_read_position_cmd(&pc
);
1679 return (idetape_queue_pc_tail(drive
, &pc
));
1682 static void ide_tape_discard_merge_buffer(ide_drive_t
*drive
,
1683 int restore_position
)
1685 idetape_tape_t
*tape
= drive
->driver_data
;
1688 __ide_tape_discard_merge_buffer(drive
);
1689 if (restore_position
) {
1690 position
= idetape_read_position(drive
);
1691 seek
= position
> 0 ? position
: 0;
1692 if (idetape_position_tape(drive
, seek
, 0, 0)) {
1693 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
1694 " %s\n", tape
->name
, __func__
);
1701 * Generate a read/write request for the block device interface and wait for it
1704 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
,
1705 struct idetape_bh
*bh
)
1707 idetape_tape_t
*tape
= drive
->driver_data
;
1711 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
1713 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
1714 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1716 rq
->rq_disk
= tape
->disk
;
1717 rq
->special
= (void *)bh
;
1718 rq
->sector
= tape
->first_frame
;
1719 rq
->nr_sectors
= blocks
;
1720 rq
->current_nr_sectors
= blocks
;
1721 blk_execute_rq(drive
->queue
, tape
->disk
, rq
, 0);
1723 errors
= rq
->errors
;
1724 ret
= tape
->blk_size
* (blocks
- rq
->current_nr_sectors
);
1725 blk_put_request(rq
);
1727 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
1731 idetape_init_merge_buffer(tape
);
1732 if (errors
== IDETAPE_ERROR_GENERAL
)
1737 static void idetape_create_inquiry_cmd(struct ide_atapi_pc
*pc
)
1739 idetape_init_pc(pc
);
1743 pc
->idetape_callback
= &idetape_pc_callback
;
1746 static void idetape_create_rewind_cmd(ide_drive_t
*drive
,
1747 struct ide_atapi_pc
*pc
)
1749 idetape_init_pc(pc
);
1750 pc
->c
[0] = REZERO_UNIT
;
1751 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1752 pc
->idetape_callback
= &idetape_pc_callback
;
1755 static void idetape_create_erase_cmd(struct ide_atapi_pc
*pc
)
1757 idetape_init_pc(pc
);
1760 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1761 pc
->idetape_callback
= &idetape_pc_callback
;
1764 static void idetape_create_space_cmd(struct ide_atapi_pc
*pc
, int count
, u8 cmd
)
1766 idetape_init_pc(pc
);
1768 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
1770 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1771 pc
->idetape_callback
= &idetape_pc_callback
;
1774 /* Queue up a character device originated write request. */
1775 static int idetape_add_chrdev_write_request(ide_drive_t
*drive
, int blocks
)
1777 idetape_tape_t
*tape
= drive
->driver_data
;
1779 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1781 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
1782 blocks
, tape
->merge_bh
);
1785 static void ide_tape_flush_merge_buffer(ide_drive_t
*drive
)
1787 idetape_tape_t
*tape
= drive
->driver_data
;
1789 struct idetape_bh
*bh
;
1791 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1792 printk(KERN_ERR
"ide-tape: bug: Trying to empty merge buffer"
1793 " but we are not writing.\n");
1796 if (tape
->merge_bh_size
> tape
->buffer_size
) {
1797 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
1798 tape
->merge_bh_size
= tape
->buffer_size
;
1800 if (tape
->merge_bh_size
) {
1801 blocks
= tape
->merge_bh_size
/ tape
->blk_size
;
1802 if (tape
->merge_bh_size
% tape
->blk_size
) {
1806 i
= tape
->blk_size
- tape
->merge_bh_size
%
1808 bh
= tape
->bh
->b_reqnext
;
1810 atomic_set(&bh
->b_count
, 0);
1816 printk(KERN_INFO
"ide-tape: bug,"
1820 min
= min(i
, (unsigned int)(bh
->b_size
-
1821 atomic_read(&bh
->b_count
)));
1822 memset(bh
->b_data
+ atomic_read(&bh
->b_count
),
1824 atomic_add(min
, &bh
->b_count
);
1829 (void) idetape_add_chrdev_write_request(drive
, blocks
);
1830 tape
->merge_bh_size
= 0;
1832 if (tape
->merge_bh
!= NULL
) {
1833 ide_tape_kfree_buffer(tape
);
1834 tape
->merge_bh
= NULL
;
1836 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1839 static int idetape_init_read(ide_drive_t
*drive
)
1841 idetape_tape_t
*tape
= drive
->driver_data
;
1844 /* Initialize read operation */
1845 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1846 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1847 ide_tape_flush_merge_buffer(drive
);
1848 idetape_flush_tape_buffers(drive
);
1850 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1851 printk(KERN_ERR
"ide-tape: merge_bh_size should be"
1853 tape
->merge_bh_size
= 0;
1855 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1856 if (!tape
->merge_bh
)
1858 tape
->chrdev_dir
= IDETAPE_DIR_READ
;
1861 * Issue a read 0 command to ensure that DSC handshake is
1862 * switched from completion mode to buffer available mode.
1863 * No point in issuing this if DSC overlap isn't supported, some
1864 * drives (Seagate STT3401A) will return an error.
1866 if (drive
->dsc_overlap
) {
1867 bytes_read
= idetape_queue_rw_tail(drive
,
1868 REQ_IDETAPE_READ
, 0,
1870 if (bytes_read
< 0) {
1871 ide_tape_kfree_buffer(tape
);
1872 tape
->merge_bh
= NULL
;
1873 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1882 /* called from idetape_chrdev_read() to service a chrdev read request. */
1883 static int idetape_add_chrdev_read_request(ide_drive_t
*drive
, int blocks
)
1885 idetape_tape_t
*tape
= drive
->driver_data
;
1887 debug_log(DBG_PROCS
, "Enter %s, %d blocks\n", __func__
, blocks
);
1889 /* If we are at a filemark, return a read length of 0 */
1890 if (test_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
))
1893 idetape_init_read(drive
);
1895 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
,
1899 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
1901 idetape_tape_t
*tape
= drive
->driver_data
;
1902 struct idetape_bh
*bh
;
1908 bh
= tape
->merge_bh
;
1909 count
= min(tape
->buffer_size
, bcount
);
1911 blocks
= count
/ tape
->blk_size
;
1913 atomic_set(&bh
->b_count
,
1914 min(count
, (unsigned int)bh
->b_size
));
1915 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
1916 count
-= atomic_read(&bh
->b_count
);
1919 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
,
1925 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1926 * currently support only one partition.
1928 static int idetape_rewind_tape(ide_drive_t
*drive
)
1931 struct ide_atapi_pc pc
;
1932 idetape_tape_t
*tape
;
1933 tape
= drive
->driver_data
;
1935 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
1937 idetape_create_rewind_cmd(drive
, &pc
);
1938 retval
= idetape_queue_pc_tail(drive
, &pc
);
1942 idetape_create_read_position_cmd(&pc
);
1943 retval
= idetape_queue_pc_tail(drive
, &pc
);
1949 /* mtio.h compatible commands should be issued to the chrdev interface. */
1950 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
1953 idetape_tape_t
*tape
= drive
->driver_data
;
1954 void __user
*argp
= (void __user
*)arg
;
1956 struct idetape_config
{
1957 int dsc_rw_frequency
;
1958 int dsc_media_access_frequency
;
1962 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1966 if (copy_from_user(&config
, argp
, sizeof(config
)))
1968 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
1971 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
1972 config
.nr_stages
= 1;
1973 if (copy_to_user(argp
, &config
, sizeof(config
)))
1982 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
1985 idetape_tape_t
*tape
= drive
->driver_data
;
1986 struct ide_atapi_pc pc
;
1987 int retval
, count
= 0;
1988 int sprev
= !!(tape
->caps
[4] & 0x20);
1992 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
1995 mt_count
= -mt_count
;
1998 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1999 tape
->merge_bh_size
= 0;
2000 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
))
2002 ide_tape_discard_merge_buffer(drive
, 0);
2008 idetape_create_space_cmd(&pc
, mt_count
- count
,
2009 IDETAPE_SPACE_OVER_FILEMARK
);
2010 return idetape_queue_pc_tail(drive
, &pc
);
2015 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
2019 count
= (MTBSFM
== mt_op
? 1 : -1);
2020 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
2022 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
2029 * Our character device read / write functions.
2031 * The tape is optimized to maximize throughput when it is transferring an
2032 * integral number of the "continuous transfer limit", which is a parameter of
2033 * the specific tape (26kB on my particular tape, 32kB for Onstream).
2035 * As of version 1.3 of the driver, the character device provides an abstract
2036 * continuous view of the media - any mix of block sizes (even 1 byte) on the
2037 * same backup/restore procedure is supported. The driver will internally
2038 * convert the requests to the recommended transfer unit, so that an unmatch
2039 * between the user's block size to the recommended size will only result in a
2040 * (slightly) increased driver overhead, but will no longer hit performance.
2041 * This is not applicable to Onstream.
2043 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
2044 size_t count
, loff_t
*ppos
)
2046 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2047 ide_drive_t
*drive
= tape
->drive
;
2048 ssize_t bytes_read
, temp
, actually_read
= 0, rc
;
2050 u16 ctl
= *(u16
*)&tape
->caps
[12];
2052 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
2054 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
2055 if (test_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
))
2056 if (count
> tape
->blk_size
&&
2057 (count
% tape
->blk_size
) == 0)
2058 tape
->user_bs_factor
= count
/ tape
->blk_size
;
2060 rc
= idetape_init_read(drive
);
2065 if (tape
->merge_bh_size
) {
2066 actually_read
= min((unsigned int)(tape
->merge_bh_size
),
2067 (unsigned int)count
);
2068 if (idetape_copy_stage_to_user(tape
, buf
, actually_read
))
2070 buf
+= actually_read
;
2071 tape
->merge_bh_size
-= actually_read
;
2072 count
-= actually_read
;
2074 while (count
>= tape
->buffer_size
) {
2075 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
2076 if (bytes_read
<= 0)
2078 if (idetape_copy_stage_to_user(tape
, buf
, bytes_read
))
2081 count
-= bytes_read
;
2082 actually_read
+= bytes_read
;
2085 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
2086 if (bytes_read
<= 0)
2088 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
2089 if (idetape_copy_stage_to_user(tape
, buf
, temp
))
2091 actually_read
+= temp
;
2092 tape
->merge_bh_size
= bytes_read
-temp
;
2095 if (!actually_read
&& test_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
)) {
2096 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
2098 idetape_space_over_filemarks(drive
, MTFSF
, 1);
2102 return ret
? ret
: actually_read
;
2105 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
2106 size_t count
, loff_t
*ppos
)
2108 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2109 ide_drive_t
*drive
= tape
->drive
;
2110 ssize_t actually_written
= 0;
2112 u16 ctl
= *(u16
*)&tape
->caps
[12];
2114 /* The drive is write protected. */
2115 if (tape
->write_prot
)
2118 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
2120 /* Initialize write operation */
2121 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
2122 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
2123 ide_tape_discard_merge_buffer(drive
, 1);
2124 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
2125 printk(KERN_ERR
"ide-tape: merge_bh_size "
2126 "should be 0 now\n");
2127 tape
->merge_bh_size
= 0;
2129 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
2130 if (!tape
->merge_bh
)
2132 tape
->chrdev_dir
= IDETAPE_DIR_WRITE
;
2133 idetape_init_merge_buffer(tape
);
2136 * Issue a write 0 command to ensure that DSC handshake is
2137 * switched from completion mode to buffer available mode. No
2138 * point in issuing this if DSC overlap isn't supported, some
2139 * drives (Seagate STT3401A) will return an error.
2141 if (drive
->dsc_overlap
) {
2142 ssize_t retval
= idetape_queue_rw_tail(drive
,
2143 REQ_IDETAPE_WRITE
, 0,
2146 ide_tape_kfree_buffer(tape
);
2147 tape
->merge_bh
= NULL
;
2148 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2155 if (tape
->merge_bh_size
) {
2156 if (tape
->merge_bh_size
>= tape
->buffer_size
) {
2157 printk(KERN_ERR
"ide-tape: bug: merge buf too big\n");
2158 tape
->merge_bh_size
= 0;
2160 actually_written
= min((unsigned int)
2161 (tape
->buffer_size
- tape
->merge_bh_size
),
2162 (unsigned int)count
);
2163 if (idetape_copy_stage_from_user(tape
, buf
, actually_written
))
2165 buf
+= actually_written
;
2166 tape
->merge_bh_size
+= actually_written
;
2167 count
-= actually_written
;
2169 if (tape
->merge_bh_size
== tape
->buffer_size
) {
2171 tape
->merge_bh_size
= 0;
2172 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
2177 while (count
>= tape
->buffer_size
) {
2179 if (idetape_copy_stage_from_user(tape
, buf
, tape
->buffer_size
))
2181 buf
+= tape
->buffer_size
;
2182 count
-= tape
->buffer_size
;
2183 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
2184 actually_written
+= tape
->buffer_size
;
2189 actually_written
+= count
;
2190 if (idetape_copy_stage_from_user(tape
, buf
, count
))
2192 tape
->merge_bh_size
+= count
;
2194 return ret
? ret
: actually_written
;
2197 static int idetape_write_filemark(ide_drive_t
*drive
)
2199 struct ide_atapi_pc pc
;
2201 /* Write a filemark */
2202 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
2203 if (idetape_queue_pc_tail(drive
, &pc
)) {
2204 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
2211 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
2214 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
2215 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
2216 * usually not supported.
2218 * The following commands are currently not supported:
2220 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
2221 * MT_ST_WRITE_THRESHOLD.
2223 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
2225 idetape_tape_t
*tape
= drive
->driver_data
;
2226 struct ide_atapi_pc pc
;
2229 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
2239 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
2246 if (tape
->write_prot
)
2248 ide_tape_discard_merge_buffer(drive
, 1);
2249 for (i
= 0; i
< mt_count
; i
++) {
2250 retval
= idetape_write_filemark(drive
);
2256 ide_tape_discard_merge_buffer(drive
, 0);
2257 if (idetape_rewind_tape(drive
))
2261 ide_tape_discard_merge_buffer(drive
, 0);
2262 idetape_create_load_unload_cmd(drive
, &pc
,
2263 IDETAPE_LU_LOAD_MASK
);
2264 return idetape_queue_pc_tail(drive
, &pc
);
2268 * If door is locked, attempt to unlock before
2269 * attempting to eject.
2271 if (tape
->door_locked
) {
2272 if (idetape_create_prevent_cmd(drive
, &pc
, 0))
2273 if (!idetape_queue_pc_tail(drive
, &pc
))
2274 tape
->door_locked
= DOOR_UNLOCKED
;
2276 ide_tape_discard_merge_buffer(drive
, 0);
2277 idetape_create_load_unload_cmd(drive
, &pc
,
2278 !IDETAPE_LU_LOAD_MASK
);
2279 retval
= idetape_queue_pc_tail(drive
, &pc
);
2281 clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
);
2284 ide_tape_discard_merge_buffer(drive
, 0);
2285 return idetape_flush_tape_buffers(drive
);
2287 ide_tape_discard_merge_buffer(drive
, 0);
2288 idetape_create_load_unload_cmd(drive
, &pc
,
2289 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
2290 return idetape_queue_pc_tail(drive
, &pc
);
2292 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
2293 return idetape_queue_pc_tail(drive
, &pc
);
2295 (void)idetape_rewind_tape(drive
);
2296 idetape_create_erase_cmd(&pc
);
2297 return idetape_queue_pc_tail(drive
, &pc
);
2300 if (mt_count
< tape
->blk_size
||
2301 mt_count
% tape
->blk_size
)
2303 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
2304 clear_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
);
2306 set_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
);
2309 ide_tape_discard_merge_buffer(drive
, 0);
2310 return idetape_position_tape(drive
,
2311 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
2313 ide_tape_discard_merge_buffer(drive
, 0);
2314 return idetape_position_tape(drive
, 0, mt_count
, 0);
2318 if (!idetape_create_prevent_cmd(drive
, &pc
, 1))
2320 retval
= idetape_queue_pc_tail(drive
, &pc
);
2323 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
2326 if (!idetape_create_prevent_cmd(drive
, &pc
, 0))
2328 retval
= idetape_queue_pc_tail(drive
, &pc
);
2331 tape
->door_locked
= DOOR_UNLOCKED
;
2334 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
2341 * Our character device ioctls. General mtio.h magnetic io commands are
2342 * supported here, and not in the corresponding block interface. Our own
2343 * ide-tape ioctls are supported on both interfaces.
2345 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
2346 unsigned int cmd
, unsigned long arg
)
2348 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2349 ide_drive_t
*drive
= tape
->drive
;
2353 int block_offset
= 0, position
= tape
->first_frame
;
2354 void __user
*argp
= (void __user
*)arg
;
2356 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
2358 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
2359 ide_tape_flush_merge_buffer(drive
);
2360 idetape_flush_tape_buffers(drive
);
2362 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
2363 block_offset
= tape
->merge_bh_size
/
2364 (tape
->blk_size
* tape
->user_bs_factor
);
2365 position
= idetape_read_position(drive
);
2371 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
2373 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
2375 memset(&mtget
, 0, sizeof(struct mtget
));
2376 mtget
.mt_type
= MT_ISSCSI2
;
2377 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
2379 ((tape
->blk_size
* tape
->user_bs_factor
)
2380 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
2382 if (tape
->drv_write_prot
)
2383 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
2385 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
2389 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
2390 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
2394 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
2395 ide_tape_discard_merge_buffer(drive
, 1);
2396 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
2401 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
2402 * block size with the reported value.
2404 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
2406 idetape_tape_t
*tape
= drive
->driver_data
;
2407 struct ide_atapi_pc pc
;
2409 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
2410 if (idetape_queue_pc_tail(drive
, &pc
)) {
2411 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
2412 if (tape
->blk_size
== 0) {
2413 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
2414 "block size, assuming 32k\n");
2415 tape
->blk_size
= 32768;
2419 tape
->blk_size
= (pc
.buf
[4 + 5] << 16) +
2420 (pc
.buf
[4 + 6] << 8) +
2422 tape
->drv_write_prot
= (pc
.buf
[2] & 0x80) >> 7;
2425 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
2427 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
2429 idetape_tape_t
*tape
;
2430 struct ide_atapi_pc pc
;
2433 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
2436 tape
= ide_tape_chrdev_get(i
);
2440 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2443 * We really want to do nonseekable_open(inode, filp); here, but some
2444 * versions of tar incorrectly call lseek on tapes and bail out if that
2445 * fails. So we disallow pread() and pwrite(), but permit lseeks.
2447 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
2449 drive
= tape
->drive
;
2451 filp
->private_data
= tape
;
2453 if (test_and_set_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
)) {
2458 retval
= idetape_wait_ready(drive
, 60 * HZ
);
2460 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2461 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
2465 idetape_read_position(drive
);
2466 if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
))
2467 (void)idetape_rewind_tape(drive
);
2469 /* Read block size and write protect status from drive. */
2470 ide_tape_get_bsize_from_bdesc(drive
);
2472 /* Set write protect flag if device is opened as read-only. */
2473 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
2474 tape
->write_prot
= 1;
2476 tape
->write_prot
= tape
->drv_write_prot
;
2478 /* Make sure drive isn't write protected if user wants to write. */
2479 if (tape
->write_prot
) {
2480 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
2481 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
2482 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2488 /* Lock the tape drive door so user can't eject. */
2489 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2490 if (idetape_create_prevent_cmd(drive
, &pc
, 1)) {
2491 if (!idetape_queue_pc_tail(drive
, &pc
)) {
2492 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
2493 tape
->door_locked
= DOOR_LOCKED
;
2504 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
2506 idetape_tape_t
*tape
= drive
->driver_data
;
2508 ide_tape_flush_merge_buffer(drive
);
2509 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 1, 0);
2510 if (tape
->merge_bh
!= NULL
) {
2511 idetape_pad_zeros(drive
, tape
->blk_size
*
2512 (tape
->user_bs_factor
- 1));
2513 ide_tape_kfree_buffer(tape
);
2514 tape
->merge_bh
= NULL
;
2516 idetape_write_filemark(drive
);
2517 idetape_flush_tape_buffers(drive
);
2518 idetape_flush_tape_buffers(drive
);
2521 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
2523 struct ide_tape_obj
*tape
= ide_tape_f(filp
);
2524 ide_drive_t
*drive
= tape
->drive
;
2525 struct ide_atapi_pc pc
;
2526 unsigned int minor
= iminor(inode
);
2529 tape
= drive
->driver_data
;
2531 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2533 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
2534 idetape_write_release(drive
, minor
);
2535 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
2537 ide_tape_discard_merge_buffer(drive
, 1);
2540 if (minor
< 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
))
2541 (void) idetape_rewind_tape(drive
);
2542 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2543 if (tape
->door_locked
== DOOR_LOCKED
) {
2544 if (idetape_create_prevent_cmd(drive
, &pc
, 0)) {
2545 if (!idetape_queue_pc_tail(drive
, &pc
))
2546 tape
->door_locked
= DOOR_UNLOCKED
;
2550 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2557 * check the contents of the ATAPI IDENTIFY command results. We return:
2559 * 1 - If the tape can be supported by us, based on the information we have so
2562 * 0 - If this tape driver is not currently supported by us.
2564 static int idetape_identify_device(ide_drive_t
*drive
)
2566 u8 gcw
[2], protocol
, device_type
, removable
, packet_size
;
2568 if (drive
->id_read
== 0)
2571 *((unsigned short *) &gcw
) = drive
->id
->config
;
2573 protocol
= (gcw
[1] & 0xC0) >> 6;
2574 device_type
= gcw
[1] & 0x1F;
2575 removable
= !!(gcw
[0] & 0x80);
2576 packet_size
= gcw
[0] & 0x3;
2578 /* Check that we can support this device */
2580 printk(KERN_ERR
"ide-tape: Protocol (0x%02x) is not ATAPI\n",
2582 else if (device_type
!= 1)
2583 printk(KERN_ERR
"ide-tape: Device type (0x%02x) is not set "
2584 "to tape\n", device_type
);
2585 else if (!removable
)
2586 printk(KERN_ERR
"ide-tape: The removable flag is not set\n");
2587 else if (packet_size
!= 0) {
2588 printk(KERN_ERR
"ide-tape: Packet size (0x%02x) is not 12"
2589 " bytes\n", packet_size
);
2595 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
2597 idetape_tape_t
*tape
= drive
->driver_data
;
2598 struct ide_atapi_pc pc
;
2599 char fw_rev
[6], vendor_id
[10], product_id
[18];
2601 idetape_create_inquiry_cmd(&pc
);
2602 if (idetape_queue_pc_tail(drive
, &pc
)) {
2603 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
2607 memcpy(vendor_id
, &pc
.buf
[8], 8);
2608 memcpy(product_id
, &pc
.buf
[16], 16);
2609 memcpy(fw_rev
, &pc
.buf
[32], 4);
2611 ide_fixstring(vendor_id
, 10, 0);
2612 ide_fixstring(product_id
, 18, 0);
2613 ide_fixstring(fw_rev
, 6, 0);
2615 printk(KERN_INFO
"ide-tape: %s <-> %s: %s %s rev %s\n",
2616 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
2620 * Ask the tape about its various parameters. In particular, we will adjust our
2621 * data transfer buffer size to the recommended value as returned by the tape.
2623 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
2625 idetape_tape_t
*tape
= drive
->driver_data
;
2626 struct ide_atapi_pc pc
;
2628 u8 speed
, max_speed
;
2630 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
2631 if (idetape_queue_pc_tail(drive
, &pc
)) {
2632 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
2633 " some default values\n");
2634 tape
->blk_size
= 512;
2635 put_unaligned(52, (u16
*)&tape
->caps
[12]);
2636 put_unaligned(540, (u16
*)&tape
->caps
[14]);
2637 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
2640 caps
= pc
.buf
+ 4 + pc
.buf
[3];
2642 /* convert to host order and save for later use */
2643 speed
= be16_to_cpu(*(u16
*)&caps
[14]);
2644 max_speed
= be16_to_cpu(*(u16
*)&caps
[8]);
2646 put_unaligned(max_speed
, (u16
*)&caps
[8]);
2647 put_unaligned(be16_to_cpu(*(u16
*)&caps
[12]), (u16
*)&caps
[12]);
2648 put_unaligned(speed
, (u16
*)&caps
[14]);
2649 put_unaligned(be16_to_cpu(*(u16
*)&caps
[16]), (u16
*)&caps
[16]);
2652 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
2653 "(assuming 650KB/sec)\n", drive
->name
);
2654 put_unaligned(650, (u16
*)&caps
[14]);
2657 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
2658 "(assuming 650KB/sec)\n", drive
->name
);
2659 put_unaligned(650, (u16
*)&caps
[8]);
2662 memcpy(&tape
->caps
, caps
, 20);
2664 tape
->blk_size
= 512;
2665 else if (caps
[7] & 0x04)
2666 tape
->blk_size
= 1024;
2669 #ifdef CONFIG_IDE_PROC_FS
2670 static void idetape_add_settings(ide_drive_t
*drive
)
2672 idetape_tape_t
*tape
= drive
->driver_data
;
2674 ide_add_setting(drive
, "buffer", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
2675 1, 2, (u16
*)&tape
->caps
[16], NULL
);
2676 ide_add_setting(drive
, "speed", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
2677 1, 1, (u16
*)&tape
->caps
[14], NULL
);
2678 ide_add_setting(drive
, "buffer_size", SETTING_READ
, TYPE_INT
, 0, 0xffff,
2679 1, 1024, &tape
->buffer_size
, NULL
);
2680 ide_add_setting(drive
, "tdsc", SETTING_RW
, TYPE_INT
, IDETAPE_DSC_RW_MIN
,
2681 IDETAPE_DSC_RW_MAX
, 1000, HZ
, &tape
->best_dsc_rw_freq
,
2683 ide_add_setting(drive
, "dsc_overlap", SETTING_RW
, TYPE_BYTE
, 0, 1, 1,
2684 1, &drive
->dsc_overlap
, NULL
);
2685 ide_add_setting(drive
, "avg_speed", SETTING_READ
, TYPE_INT
, 0, 0xffff,
2686 1, 1, &tape
->avg_speed
, NULL
);
2687 ide_add_setting(drive
, "debug_mask", SETTING_RW
, TYPE_INT
, 0, 0xffff, 1,
2688 1, &tape
->debug_mask
, NULL
);
2691 static inline void idetape_add_settings(ide_drive_t
*drive
) { ; }
2695 * The function below is called to:
2697 * 1. Initialize our various state variables.
2698 * 2. Ask the tape for its capabilities.
2699 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2700 * is chosen based on the recommendation which we received in step 2.
2702 * Note that at this point ide.c already assigned us an irq, so that we can
2703 * queue requests here and wait for their completion.
2705 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
2711 u16
*ctl
= (u16
*)&tape
->caps
[12];
2713 spin_lock_init(&tape
->lock
);
2714 drive
->dsc_overlap
= 1;
2715 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
2716 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
2718 drive
->dsc_overlap
= 0;
2720 /* Seagate Travan drives do not support DSC overlap. */
2721 if (strstr(drive
->id
->model
, "Seagate STT3401"))
2722 drive
->dsc_overlap
= 0;
2723 tape
->minor
= minor
;
2724 tape
->name
[0] = 'h';
2725 tape
->name
[1] = 't';
2726 tape
->name
[2] = '0' + minor
;
2727 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2728 tape
->pc
= tape
->pc_stack
;
2729 *((unsigned short *) &gcw
) = drive
->id
->config
;
2731 /* Command packet DRQ type */
2732 if (((gcw
[0] & 0x60) >> 5) == 1)
2733 set_bit(IDETAPE_FLAG_DRQ_INTERRUPT
, &tape
->flags
);
2735 idetape_get_inquiry_results(drive
);
2736 idetape_get_mode_sense_results(drive
);
2737 ide_tape_get_bsize_from_bdesc(drive
);
2738 tape
->user_bs_factor
= 1;
2739 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2740 while (tape
->buffer_size
> 0xffff) {
2741 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
2743 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2745 buffer_size
= tape
->buffer_size
;
2746 tape
->pages_per_buffer
= buffer_size
/ PAGE_SIZE
;
2747 if (buffer_size
% PAGE_SIZE
) {
2748 tape
->pages_per_buffer
++;
2749 tape
->excess_bh_size
= PAGE_SIZE
- buffer_size
% PAGE_SIZE
;
2752 /* select the "best" DSC read/write polling freq */
2753 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
2755 t
= (IDETAPE_FIFO_THRESHOLD
* tape
->buffer_size
* HZ
) / (speed
* 1000);
2758 * Ensure that the number we got makes sense; limit it within
2759 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2761 tape
->best_dsc_rw_freq
= clamp_t(unsigned long, t
, IDETAPE_DSC_RW_MIN
,
2762 IDETAPE_DSC_RW_MAX
);
2763 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2765 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
2766 (*(u16
*)&tape
->caps
[16] * 512) / tape
->buffer_size
,
2767 tape
->buffer_size
/ 1024,
2768 tape
->best_dsc_rw_freq
* 1000 / HZ
,
2769 drive
->using_dma
? ", DMA":"");
2771 idetape_add_settings(drive
);
2774 static void ide_tape_remove(ide_drive_t
*drive
)
2776 idetape_tape_t
*tape
= drive
->driver_data
;
2778 ide_proc_unregister_driver(drive
, tape
->driver
);
2780 ide_unregister_region(tape
->disk
);
2785 static void ide_tape_release(struct kref
*kref
)
2787 struct ide_tape_obj
*tape
= to_ide_tape(kref
);
2788 ide_drive_t
*drive
= tape
->drive
;
2789 struct gendisk
*g
= tape
->disk
;
2791 BUG_ON(tape
->merge_bh_size
);
2793 drive
->dsc_overlap
= 0;
2794 drive
->driver_data
= NULL
;
2795 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
2796 device_destroy(idetape_sysfs_class
,
2797 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
2798 idetape_devs
[tape
->minor
] = NULL
;
2799 g
->private_data
= NULL
;
2804 #ifdef CONFIG_IDE_PROC_FS
2805 static int proc_idetape_read_name
2806 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
2808 ide_drive_t
*drive
= (ide_drive_t
*) data
;
2809 idetape_tape_t
*tape
= drive
->driver_data
;
2813 len
= sprintf(out
, "%s\n", tape
->name
);
2814 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
2817 static ide_proc_entry_t idetape_proc
[] = {
2818 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
2819 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
2820 { NULL
, 0, NULL
, NULL
}
2824 static int ide_tape_probe(ide_drive_t
*);
2826 static ide_driver_t idetape_driver
= {
2828 .owner
= THIS_MODULE
,
2830 .bus
= &ide_bus_type
,
2832 .probe
= ide_tape_probe
,
2833 .remove
= ide_tape_remove
,
2834 .version
= IDETAPE_VERSION
,
2836 .supports_dsc_overlap
= 1,
2837 .do_request
= idetape_do_request
,
2838 .end_request
= idetape_end_request
,
2839 .error
= __ide_error
,
2840 .abort
= __ide_abort
,
2841 #ifdef CONFIG_IDE_PROC_FS
2842 .proc
= idetape_proc
,
2846 /* Our character device supporting functions, passed to register_chrdev. */
2847 static const struct file_operations idetape_fops
= {
2848 .owner
= THIS_MODULE
,
2849 .read
= idetape_chrdev_read
,
2850 .write
= idetape_chrdev_write
,
2851 .ioctl
= idetape_chrdev_ioctl
,
2852 .open
= idetape_chrdev_open
,
2853 .release
= idetape_chrdev_release
,
2856 static int idetape_open(struct inode
*inode
, struct file
*filp
)
2858 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
2859 struct ide_tape_obj
*tape
;
2861 tape
= ide_tape_get(disk
);
2868 static int idetape_release(struct inode
*inode
, struct file
*filp
)
2870 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
2871 struct ide_tape_obj
*tape
= ide_tape_g(disk
);
2878 static int idetape_ioctl(struct inode
*inode
, struct file
*file
,
2879 unsigned int cmd
, unsigned long arg
)
2881 struct block_device
*bdev
= inode
->i_bdev
;
2882 struct ide_tape_obj
*tape
= ide_tape_g(bdev
->bd_disk
);
2883 ide_drive_t
*drive
= tape
->drive
;
2884 int err
= generic_ide_ioctl(drive
, file
, bdev
, cmd
, arg
);
2886 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
2890 static struct block_device_operations idetape_block_ops
= {
2891 .owner
= THIS_MODULE
,
2892 .open
= idetape_open
,
2893 .release
= idetape_release
,
2894 .ioctl
= idetape_ioctl
,
2897 static int ide_tape_probe(ide_drive_t
*drive
)
2899 idetape_tape_t
*tape
;
2903 if (!strstr("ide-tape", drive
->driver_req
))
2905 if (!drive
->present
)
2907 if (drive
->media
!= ide_tape
)
2909 if (!idetape_identify_device(drive
)) {
2910 printk(KERN_ERR
"ide-tape: %s: not supported by this version of"
2911 " the driver\n", drive
->name
);
2915 printk(KERN_INFO
"ide-tape: passing drive %s to ide-scsi"
2916 " emulation.\n", drive
->name
);
2919 tape
= kzalloc(sizeof(idetape_tape_t
), GFP_KERNEL
);
2921 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape struct\n",
2926 g
= alloc_disk(1 << PARTN_BITS
);
2930 ide_init_disk(g
, drive
);
2932 ide_proc_register_driver(drive
, &idetape_driver
);
2934 kref_init(&tape
->kref
);
2936 tape
->drive
= drive
;
2937 tape
->driver
= &idetape_driver
;
2940 g
->private_data
= &tape
->driver
;
2942 drive
->driver_data
= tape
;
2944 mutex_lock(&idetape_ref_mutex
);
2945 for (minor
= 0; idetape_devs
[minor
]; minor
++)
2947 idetape_devs
[minor
] = tape
;
2948 mutex_unlock(&idetape_ref_mutex
);
2950 idetape_setup(drive
, tape
, minor
);
2952 device_create(idetape_sysfs_class
, &drive
->gendev
,
2953 MKDEV(IDETAPE_MAJOR
, minor
), "%s", tape
->name
);
2954 device_create(idetape_sysfs_class
, &drive
->gendev
,
2955 MKDEV(IDETAPE_MAJOR
, minor
+ 128), "n%s", tape
->name
);
2957 g
->fops
= &idetape_block_ops
;
2958 ide_register_region(g
);
2968 static void __exit
idetape_exit(void)
2970 driver_unregister(&idetape_driver
.gen_driver
);
2971 class_destroy(idetape_sysfs_class
);
2972 unregister_chrdev(IDETAPE_MAJOR
, "ht");
2975 static int __init
idetape_init(void)
2978 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
2979 if (IS_ERR(idetape_sysfs_class
)) {
2980 idetape_sysfs_class
= NULL
;
2981 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
2986 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
2987 printk(KERN_ERR
"ide-tape: Failed to register chrdev"
2990 goto out_free_class
;
2993 error
= driver_register(&idetape_driver
.gen_driver
);
2995 goto out_free_driver
;
3000 driver_unregister(&idetape_driver
.gen_driver
);
3002 class_destroy(idetape_sysfs_class
);
3007 MODULE_ALIAS("ide:*m-tape*");
3008 module_init(idetape_init
);
3009 module_exit(idetape_exit
);
3010 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);
3011 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
3012 MODULE_LICENSE("GPL");