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),
218 /* A pipeline stage. */
219 typedef struct idetape_stage_s
{
220 struct request rq
; /* The corresponding request */
221 struct idetape_bh
*bh
; /* The data buffers */
222 struct idetape_stage_s
*next
; /* Pointer to the next stage */
226 * Most of our global data which we need to save even as we leave the driver due
227 * to an interrupt or a timer event is stored in the struct defined below.
229 typedef struct ide_tape_obj
{
231 ide_driver_t
*driver
;
232 struct gendisk
*disk
;
236 * Since a typical character device operation requires more
237 * than one packet command, we provide here enough memory
238 * for the maximum of interconnected packet commands.
239 * The packet commands are stored in the circular array pc_stack.
240 * pc_stack_index points to the last used entry, and warps around
241 * to the start when we get to the last array entry.
243 * pc points to the current processed packet command.
245 * failed_pc points to the last failed packet command, or contains
246 * NULL if we do not need to retry any packet command. This is
247 * required since an additional packet command is needed before the
248 * retry, to get detailed information on what went wrong.
250 /* Current packet command */
251 struct ide_atapi_pc
*pc
;
252 /* Last failed packet command */
253 struct ide_atapi_pc
*failed_pc
;
254 /* Packet command stack */
255 struct ide_atapi_pc pc_stack
[IDETAPE_PC_STACK
];
256 /* Next free packet command storage space */
258 struct request rq_stack
[IDETAPE_PC_STACK
];
259 /* We implement a circular array */
263 * DSC polling variables.
265 * While polling for DSC we use postponed_rq to postpone the current
266 * request so that ide.c will be able to service pending requests on the
267 * other device. Note that at most we will have only one DSC (usually
268 * data transfer) request in the device request queue.
270 struct request
*postponed_rq
;
271 /* The time in which we started polling for DSC */
272 unsigned long dsc_polling_start
;
273 /* Timer used to poll for dsc */
274 struct timer_list dsc_timer
;
275 /* Read/Write dsc polling frequency */
276 unsigned long best_dsc_rw_freq
;
277 unsigned long dsc_poll_freq
;
278 unsigned long dsc_timeout
;
280 /* Read position information */
283 unsigned int first_frame
;
285 /* Last error information */
286 u8 sense_key
, asc
, ascq
;
288 /* Character device operation */
292 /* Current character device data transfer direction */
295 /* tape block size, usually 512 or 1024 bytes */
296 unsigned short blk_size
;
299 /* Copy of the tape's Capabilities and Mechanical Page */
303 * Active data transfer request parameters.
305 * At most, there is only one ide-tape originated data transfer request
306 * in the device request queue. This allows ide.c to easily service
307 * requests from the other device when we postpone our active request.
310 /* Data buffer size chosen based on the tape's recommendation */
312 idetape_stage_t
*merge_stage
;
313 int merge_stage_size
;
314 struct idetape_bh
*bh
;
318 int pages_per_buffer
;
319 /* Wasted space in each stage */
322 /* Status/Action flags: long for set_bit */
324 /* protects the ide-tape queue */
327 /* Measures average tape speed */
328 unsigned long avg_time
;
332 /* the door is currently locked */
334 /* the tape hardware is write protected */
336 /* the tape is write protected (hardware or opened as read-only) */
342 static DEFINE_MUTEX(idetape_ref_mutex
);
344 static struct class *idetape_sysfs_class
;
346 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
348 #define ide_tape_g(disk) \
349 container_of((disk)->private_data, struct ide_tape_obj, driver)
351 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
353 struct ide_tape_obj
*tape
= NULL
;
355 mutex_lock(&idetape_ref_mutex
);
356 tape
= ide_tape_g(disk
);
358 kref_get(&tape
->kref
);
359 mutex_unlock(&idetape_ref_mutex
);
363 static void ide_tape_release(struct kref
*);
365 static void ide_tape_put(struct ide_tape_obj
*tape
)
367 mutex_lock(&idetape_ref_mutex
);
368 kref_put(&tape
->kref
, ide_tape_release
);
369 mutex_unlock(&idetape_ref_mutex
);
373 * The variables below are used for the character device interface. Additional
374 * state variables are defined in our ide_drive_t structure.
376 static struct ide_tape_obj
*idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
378 #define ide_tape_f(file) ((file)->private_data)
380 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
382 struct ide_tape_obj
*tape
= NULL
;
384 mutex_lock(&idetape_ref_mutex
);
385 tape
= idetape_devs
[i
];
387 kref_get(&tape
->kref
);
388 mutex_unlock(&idetape_ref_mutex
);
392 static void idetape_input_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
395 struct idetape_bh
*bh
= pc
->bh
;
400 printk(KERN_ERR
"ide-tape: bh == NULL in "
401 "idetape_input_buffers\n");
402 ide_atapi_discard_data(drive
, bcount
);
406 (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)),
408 HWIF(drive
)->atapi_input_bytes(drive
, bh
->b_data
+
409 atomic_read(&bh
->b_count
), count
);
411 atomic_add(count
, &bh
->b_count
);
412 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
415 atomic_set(&bh
->b_count
, 0);
421 static void idetape_output_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
424 struct idetape_bh
*bh
= pc
->bh
;
429 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
433 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
434 HWIF(drive
)->atapi_output_bytes(drive
, pc
->b_data
, count
);
437 pc
->b_count
-= count
;
442 pc
->b_data
= bh
->b_data
;
443 pc
->b_count
= atomic_read(&bh
->b_count
);
449 static void idetape_update_buffers(struct ide_atapi_pc
*pc
)
451 struct idetape_bh
*bh
= pc
->bh
;
453 unsigned int bcount
= pc
->xferred
;
455 if (pc
->flags
& PC_FLAG_WRITING
)
459 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
463 count
= min((unsigned int)bh
->b_size
, (unsigned int)bcount
);
464 atomic_set(&bh
->b_count
, count
);
465 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
473 * idetape_next_pc_storage returns a pointer to a place in which we can
474 * safely store a packet command, even though we intend to leave the
475 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
476 * commands is allocated at initialization time.
478 static struct ide_atapi_pc
*idetape_next_pc_storage(ide_drive_t
*drive
)
480 idetape_tape_t
*tape
= drive
->driver_data
;
482 debug_log(DBG_PCRQ_STACK
, "pc_stack_index=%d\n", tape
->pc_stack_index
);
484 if (tape
->pc_stack_index
== IDETAPE_PC_STACK
)
485 tape
->pc_stack_index
= 0;
486 return (&tape
->pc_stack
[tape
->pc_stack_index
++]);
490 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
491 * Since we queue packet commands in the request queue, we need to
492 * allocate a request, along with the allocation of a packet command.
495 /**************************************************************
497 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
498 * followed later on by kfree(). -ml *
500 **************************************************************/
502 static struct request
*idetape_next_rq_storage(ide_drive_t
*drive
)
504 idetape_tape_t
*tape
= drive
->driver_data
;
506 debug_log(DBG_PCRQ_STACK
, "rq_stack_index=%d\n", tape
->rq_stack_index
);
508 if (tape
->rq_stack_index
== IDETAPE_PC_STACK
)
509 tape
->rq_stack_index
= 0;
510 return (&tape
->rq_stack
[tape
->rq_stack_index
++]);
513 static void idetape_init_pc(struct ide_atapi_pc
*pc
)
515 memset(pc
->c
, 0, 12);
519 pc
->buf
= pc
->pc_buf
;
520 pc
->buf_size
= IDETAPE_PC_BUFFER_SIZE
;
526 * called on each failed packet command retry to analyze the request sense. We
527 * currently do not utilize this information.
529 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
531 idetape_tape_t
*tape
= drive
->driver_data
;
532 struct ide_atapi_pc
*pc
= tape
->failed_pc
;
534 tape
->sense_key
= sense
[2] & 0xF;
535 tape
->asc
= sense
[12];
536 tape
->ascq
= sense
[13];
538 debug_log(DBG_ERR
, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
539 pc
->c
[0], tape
->sense_key
, tape
->asc
, tape
->ascq
);
541 /* Correct pc->xferred by asking the tape. */
542 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
543 pc
->xferred
= pc
->req_xfer
-
545 be32_to_cpu(get_unaligned((u32
*)&sense
[3]));
546 idetape_update_buffers(pc
);
550 * If error was the result of a zero-length read or write command,
551 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
552 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
554 if ((pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
)
556 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
557 if (tape
->sense_key
== 5) {
558 /* don't report an error, everything's ok */
560 /* don't retry read/write */
561 pc
->flags
|= PC_FLAG_ABORT
;
564 if (pc
->c
[0] == READ_6
&& (sense
[2] & 0x80)) {
565 pc
->error
= IDETAPE_ERROR_FILEMARK
;
566 pc
->flags
|= PC_FLAG_ABORT
;
568 if (pc
->c
[0] == WRITE_6
) {
569 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
570 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
571 pc
->error
= IDETAPE_ERROR_EOD
;
572 pc
->flags
|= PC_FLAG_ABORT
;
575 if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
576 if (tape
->sense_key
== 8) {
577 pc
->error
= IDETAPE_ERROR_EOD
;
578 pc
->flags
|= PC_FLAG_ABORT
;
580 if (!(pc
->flags
& PC_FLAG_ABORT
) &&
582 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
586 /* Free data buffers completely. */
587 static void ide_tape_kfree_buffer(idetape_stage_t
*stage
)
589 struct idetape_bh
*prev_bh
, *bh
= stage
->bh
;
592 u32 size
= bh
->b_size
;
595 unsigned int order
= fls(size
>> PAGE_SHIFT
)-1;
598 free_pages((unsigned long)bh
->b_data
, order
);
601 bh
->b_data
+= (1 << order
) * PAGE_SIZE
;
610 static int idetape_end_request(ide_drive_t
*drive
, int uptodate
, int nr_sects
)
612 struct request
*rq
= HWGROUP(drive
)->rq
;
613 idetape_tape_t
*tape
= drive
->driver_data
;
617 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
620 case 0: error
= IDETAPE_ERROR_GENERAL
; break;
621 case 1: error
= 0; break;
622 default: error
= uptodate
;
626 tape
->failed_pc
= NULL
;
628 if (!blk_special_request(rq
)) {
629 ide_end_request(drive
, uptodate
, nr_sects
);
633 spin_lock_irqsave(&tape
->lock
, flags
);
635 ide_end_drive_cmd(drive
, 0, 0);
637 spin_unlock_irqrestore(&tape
->lock
, flags
);
641 static ide_startstop_t
idetape_request_sense_callback(ide_drive_t
*drive
)
643 idetape_tape_t
*tape
= drive
->driver_data
;
645 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
647 if (!tape
->pc
->error
) {
648 idetape_analyze_error(drive
, tape
->pc
->buf
);
649 idetape_end_request(drive
, 1, 0);
651 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE itself - "
652 "Aborting request!\n");
653 idetape_end_request(drive
, 0, 0);
658 static void idetape_create_request_sense_cmd(struct ide_atapi_pc
*pc
)
661 pc
->c
[0] = REQUEST_SENSE
;
664 pc
->idetape_callback
= &idetape_request_sense_callback
;
667 static void idetape_init_rq(struct request
*rq
, u8 cmd
)
669 memset(rq
, 0, sizeof(*rq
));
670 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
675 * Generate a new packet command request in front of the request queue, before
676 * the current request, so that it will be processed immediately, on the next
677 * pass through the driver. The function below is called from the request
678 * handling part of the driver (the "bottom" part). Safe storage for the request
679 * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that.
681 * Memory for those requests is pre-allocated at initialization time, and is
682 * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for
683 * the maximum possible number of inter-dependent packet commands.
685 * The higher level of the driver - The ioctl handler and the character device
686 * handling functions should queue request to the lower level part and wait for
687 * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail.
689 static void idetape_queue_pc_head(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
692 struct ide_tape_obj
*tape
= drive
->driver_data
;
694 idetape_init_rq(rq
, REQ_IDETAPE_PC1
);
695 rq
->buffer
= (char *) pc
;
696 rq
->rq_disk
= tape
->disk
;
697 (void) ide_do_drive_cmd(drive
, rq
, ide_preempt
);
701 * idetape_retry_pc is called when an error was detected during the
702 * last packet command. We queue a request sense packet command in
703 * the head of the request list.
705 static ide_startstop_t
idetape_retry_pc (ide_drive_t
*drive
)
707 idetape_tape_t
*tape
= drive
->driver_data
;
708 struct ide_atapi_pc
*pc
;
711 (void)ide_read_error(drive
);
712 pc
= idetape_next_pc_storage(drive
);
713 rq
= idetape_next_rq_storage(drive
);
714 idetape_create_request_sense_cmd(pc
);
715 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
716 idetape_queue_pc_head(drive
, pc
, rq
);
721 * Postpone the current request so that ide.c will be able to service requests
722 * from another device on the same hwgroup while we are polling for DSC.
724 static void idetape_postpone_request(ide_drive_t
*drive
)
726 idetape_tape_t
*tape
= drive
->driver_data
;
728 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
730 tape
->postponed_rq
= HWGROUP(drive
)->rq
;
731 ide_stall_queue(drive
, tape
->dsc_poll_freq
);
734 typedef void idetape_io_buf(ide_drive_t
*, struct ide_atapi_pc
*, unsigned int);
737 * This is the usual interrupt handler which will be called during a packet
738 * command. We will transfer some of the data (as requested by the drive) and
739 * will re-point interrupt handler to us. When data transfer is finished, we
740 * will act according to the algorithm described before
743 static ide_startstop_t
idetape_pc_intr(ide_drive_t
*drive
)
745 ide_hwif_t
*hwif
= drive
->hwif
;
746 idetape_tape_t
*tape
= drive
->driver_data
;
747 struct ide_atapi_pc
*pc
= tape
->pc
;
748 xfer_func_t
*xferfunc
;
749 idetape_io_buf
*iobuf
;
752 static int error_sim_count
;
757 debug_log(DBG_PROCS
, "Enter %s - interrupt handler\n", __func__
);
759 /* Clear the interrupt */
760 stat
= ide_read_status(drive
);
762 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
763 if (hwif
->dma_ops
->dma_end(drive
) || (stat
& ERR_STAT
)) {
765 * A DMA error is sometimes expected. For example,
766 * if the tape is crossing a filemark during a
767 * READ command, it will issue an irq and position
768 * itself before the filemark, so that only a partial
769 * data transfer will occur (which causes the DMA
770 * error). In that case, we will later ask the tape
771 * how much bytes of the original request were
772 * actually transferred (we can't receive that
773 * information from the DMA engine on most chipsets).
777 * On the contrary, a DMA error is never expected;
778 * it usually indicates a hardware error or abort.
779 * If the tape crosses a filemark during a READ
780 * command, it will issue an irq and position itself
781 * after the filemark (not before). Only a partial
782 * data transfer will occur, but no DMA error.
785 pc
->flags
|= PC_FLAG_DMA_ERROR
;
787 pc
->xferred
= pc
->req_xfer
;
788 idetape_update_buffers(pc
);
790 debug_log(DBG_PROCS
, "DMA finished\n");
794 /* No more interrupts */
795 if ((stat
& DRQ_STAT
) == 0) {
796 debug_log(DBG_SENSE
, "Packet command completed, %d bytes"
797 " transferred\n", pc
->xferred
);
799 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
803 if ((pc
->c
[0] == WRITE_6
|| pc
->c
[0] == READ_6
) &&
804 (++error_sim_count
% 100) == 0) {
805 printk(KERN_INFO
"ide-tape: %s: simulating error\n",
810 if ((stat
& ERR_STAT
) && pc
->c
[0] == REQUEST_SENSE
)
812 if ((stat
& ERR_STAT
) || (pc
->flags
& PC_FLAG_DMA_ERROR
)) {
814 debug_log(DBG_ERR
, "%s: I/O error\n", tape
->name
);
816 if (pc
->c
[0] == REQUEST_SENSE
) {
817 printk(KERN_ERR
"ide-tape: I/O error in request"
819 return ide_do_reset(drive
);
821 debug_log(DBG_ERR
, "[cmd %x]: check condition\n",
824 /* Retry operation */
825 return idetape_retry_pc(drive
);
828 if ((pc
->flags
& PC_FLAG_WAIT_FOR_DSC
) &&
829 (stat
& SEEK_STAT
) == 0) {
830 /* Media access command */
831 tape
->dsc_polling_start
= jiffies
;
832 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_FAST
;
833 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
834 /* Allow ide.c to handle other requests */
835 idetape_postpone_request(drive
);
838 if (tape
->failed_pc
== pc
)
839 tape
->failed_pc
= NULL
;
840 /* Command finished - Call the callback function */
841 return pc
->idetape_callback(drive
);
844 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
845 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
846 printk(KERN_ERR
"ide-tape: The tape wants to issue more "
847 "interrupts in DMA mode\n");
848 printk(KERN_ERR
"ide-tape: DMA disabled, reverting to PIO\n");
850 return ide_do_reset(drive
);
852 /* Get the number of bytes to transfer on this interrupt. */
853 bcount
= (hwif
->INB(hwif
->io_ports
.lbah_addr
) << 8) |
854 hwif
->INB(hwif
->io_ports
.lbam_addr
);
856 ireason
= hwif
->INB(hwif
->io_ports
.nsect_addr
);
859 printk(KERN_ERR
"ide-tape: CoD != 0 in %s\n", __func__
);
860 return ide_do_reset(drive
);
862 if (((ireason
& IO
) == IO
) == !!(pc
->flags
& PC_FLAG_WRITING
)) {
863 /* Hopefully, we will never get here */
864 printk(KERN_ERR
"ide-tape: We wanted to %s, ",
865 (ireason
& IO
) ? "Write" : "Read");
866 printk(KERN_ERR
"ide-tape: but the tape wants us to %s !\n",
867 (ireason
& IO
) ? "Read" : "Write");
868 return ide_do_reset(drive
);
870 if (!(pc
->flags
& PC_FLAG_WRITING
)) {
871 /* Reading - Check that we have enough space */
872 temp
= pc
->xferred
+ bcount
;
873 if (temp
> pc
->req_xfer
) {
874 if (temp
> pc
->buf_size
) {
875 printk(KERN_ERR
"ide-tape: The tape wants to "
876 "send us more data than expected "
877 "- discarding data\n");
878 ide_atapi_discard_data(drive
, bcount
);
879 ide_set_handler(drive
, &idetape_pc_intr
,
880 IDETAPE_WAIT_CMD
, NULL
);
883 debug_log(DBG_SENSE
, "The tape wants to send us more "
884 "data than expected - allowing transfer\n");
886 iobuf
= &idetape_input_buffers
;
887 xferfunc
= hwif
->atapi_input_bytes
;
889 iobuf
= &idetape_output_buffers
;
890 xferfunc
= hwif
->atapi_output_bytes
;
894 iobuf(drive
, pc
, bcount
);
896 xferfunc(drive
, pc
->cur_pos
, bcount
);
898 /* Update the current position */
899 pc
->xferred
+= bcount
;
900 pc
->cur_pos
+= bcount
;
902 debug_log(DBG_SENSE
, "[cmd %x] transferred %d bytes on that intr.\n",
905 /* And set the interrupt handler again */
906 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
911 * Packet Command Interface
913 * The current Packet Command is available in tape->pc, and will not change
914 * until we finish handling it. Each packet command is associated with a
915 * callback function that will be called when the command is finished.
917 * The handling will be done in three stages:
919 * 1. idetape_issue_pc will send the packet command to the drive, and will set
920 * the interrupt handler to idetape_pc_intr.
922 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
923 * repeated until the device signals us that no more interrupts will be issued.
925 * 3. ATAPI Tape media access commands have immediate status with a delayed
926 * process. In case of a successful initiation of a media access packet command,
927 * the DSC bit will be set when the actual execution of the command is finished.
928 * Since the tape drive will not issue an interrupt, we have to poll for this
929 * event. In this case, we define the request as "low priority request" by
930 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
933 * ide.c will then give higher priority to requests which originate from the
934 * other device, until will change rq_status to RQ_ACTIVE.
936 * 4. When the packet command is finished, it will be checked for errors.
938 * 5. In case an error was found, we queue a request sense packet command in
939 * front of the request queue and retry the operation up to
940 * IDETAPE_MAX_PC_RETRIES times.
942 * 6. In case no error was found, or we decided to give up and not to retry
943 * again, the callback function will be called and then we will handle the next
946 static ide_startstop_t
idetape_transfer_pc(ide_drive_t
*drive
)
948 ide_hwif_t
*hwif
= drive
->hwif
;
949 idetape_tape_t
*tape
= drive
->driver_data
;
950 struct ide_atapi_pc
*pc
= tape
->pc
;
952 ide_startstop_t startstop
;
955 if (ide_wait_stat(&startstop
, drive
, DRQ_STAT
, BUSY_STAT
, WAIT_READY
)) {
956 printk(KERN_ERR
"ide-tape: Strange, packet command initiated "
957 "yet DRQ isn't asserted\n");
960 ireason
= hwif
->INB(hwif
->io_ports
.nsect_addr
);
961 while (retries
-- && ((ireason
& CD
) == 0 || (ireason
& IO
))) {
962 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while issuing "
963 "a packet command, retrying\n");
965 ireason
= hwif
->INB(hwif
->io_ports
.nsect_addr
);
967 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while "
968 "issuing a packet command, ignoring\n");
973 if ((ireason
& CD
) == 0 || (ireason
& IO
)) {
974 printk(KERN_ERR
"ide-tape: (IO,CoD) != (0,1) while issuing "
975 "a packet command\n");
976 return ide_do_reset(drive
);
978 /* Set the interrupt routine */
979 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
980 #ifdef CONFIG_BLK_DEV_IDEDMA
981 /* Begin DMA, if necessary */
982 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
)
983 hwif
->dma_ops
->dma_start(drive
);
985 /* Send the actual packet */
986 HWIF(drive
)->atapi_output_bytes(drive
, pc
->c
, 12);
990 static ide_startstop_t
idetape_issue_pc(ide_drive_t
*drive
,
991 struct ide_atapi_pc
*pc
)
993 ide_hwif_t
*hwif
= drive
->hwif
;
994 idetape_tape_t
*tape
= drive
->driver_data
;
998 if (tape
->pc
->c
[0] == REQUEST_SENSE
&&
999 pc
->c
[0] == REQUEST_SENSE
) {
1000 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
1001 "Two request sense in serial were issued\n");
1004 if (tape
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
1005 tape
->failed_pc
= pc
;
1006 /* Set the current packet command */
1009 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
1010 (pc
->flags
& PC_FLAG_ABORT
)) {
1012 * We will "abort" retrying a packet command in case legitimate
1013 * error code was received (crossing a filemark, or end of the
1014 * media, for example).
1016 if (!(pc
->flags
& PC_FLAG_ABORT
)) {
1017 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
1018 tape
->sense_key
== 2 && tape
->asc
== 4 &&
1019 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
1020 printk(KERN_ERR
"ide-tape: %s: I/O error, "
1021 "pc = %2x, key = %2x, "
1022 "asc = %2x, ascq = %2x\n",
1023 tape
->name
, pc
->c
[0],
1024 tape
->sense_key
, tape
->asc
,
1028 pc
->error
= IDETAPE_ERROR_GENERAL
;
1030 tape
->failed_pc
= NULL
;
1031 return pc
->idetape_callback(drive
);
1033 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
1036 /* We haven't transferred any data yet */
1038 pc
->cur_pos
= pc
->buf
;
1039 /* Request to transfer the entire buffer at once */
1040 bcount
= pc
->req_xfer
;
1042 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
1043 pc
->flags
&= ~PC_FLAG_DMA_ERROR
;
1044 printk(KERN_WARNING
"ide-tape: DMA disabled, "
1045 "reverting to PIO\n");
1048 if ((pc
->flags
& PC_FLAG_DMA_RECOMMENDED
) && drive
->using_dma
)
1049 dma_ok
= !hwif
->dma_ops
->dma_setup(drive
);
1051 ide_pktcmd_tf_load(drive
, IDE_TFLAG_NO_SELECT_MASK
|
1052 IDE_TFLAG_OUT_DEVICE
, bcount
, dma_ok
);
1055 /* Will begin DMA later */
1056 pc
->flags
|= PC_FLAG_DMA_IN_PROGRESS
;
1057 if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT
, &tape
->flags
)) {
1058 ide_execute_command(drive
, WIN_PACKETCMD
, &idetape_transfer_pc
,
1059 IDETAPE_WAIT_CMD
, NULL
);
1062 hwif
->OUTB(WIN_PACKETCMD
, hwif
->io_ports
.command_addr
);
1063 return idetape_transfer_pc(drive
);
1067 static ide_startstop_t
idetape_pc_callback(ide_drive_t
*drive
)
1069 idetape_tape_t
*tape
= drive
->driver_data
;
1071 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1073 idetape_end_request(drive
, tape
->pc
->error
? 0 : 1, 0);
1077 /* A mode sense command is used to "sense" tape parameters. */
1078 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc
*pc
, u8 page_code
)
1080 idetape_init_pc(pc
);
1081 pc
->c
[0] = MODE_SENSE
;
1082 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
1083 /* DBD = 1 - Don't return block descriptors */
1085 pc
->c
[2] = page_code
;
1087 * Changed pc->c[3] to 0 (255 will at best return unused info).
1089 * For SCSI this byte is defined as subpage instead of high byte
1090 * of length and some IDE drives seem to interpret it this way
1091 * and return an error when 255 is used.
1094 /* We will just discard data in that case */
1096 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
1098 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
1102 pc
->idetape_callback
= &idetape_pc_callback
;
1105 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
1107 idetape_tape_t
*tape
= drive
->driver_data
;
1108 struct ide_atapi_pc
*pc
= tape
->pc
;
1111 stat
= ide_read_status(drive
);
1113 if (stat
& SEEK_STAT
) {
1114 if (stat
& ERR_STAT
) {
1115 /* Error detected */
1116 if (pc
->c
[0] != TEST_UNIT_READY
)
1117 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
1119 /* Retry operation */
1120 return idetape_retry_pc(drive
);
1123 if (tape
->failed_pc
== pc
)
1124 tape
->failed_pc
= NULL
;
1126 pc
->error
= IDETAPE_ERROR_GENERAL
;
1127 tape
->failed_pc
= NULL
;
1129 return pc
->idetape_callback(drive
);
1132 static ide_startstop_t
idetape_rw_callback(ide_drive_t
*drive
)
1134 idetape_tape_t
*tape
= drive
->driver_data
;
1135 struct request
*rq
= HWGROUP(drive
)->rq
;
1136 int blocks
= tape
->pc
->xferred
/ tape
->blk_size
;
1138 tape
->avg_size
+= blocks
* tape
->blk_size
;
1140 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
1141 tape
->avg_speed
= tape
->avg_size
* HZ
/
1142 (jiffies
- tape
->avg_time
) / 1024;
1144 tape
->avg_time
= jiffies
;
1146 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1148 tape
->first_frame
+= blocks
;
1149 rq
->current_nr_sectors
-= blocks
;
1151 if (!tape
->pc
->error
)
1152 idetape_end_request(drive
, 1, 0);
1154 idetape_end_request(drive
, tape
->pc
->error
, 0);
1158 static void idetape_create_read_cmd(idetape_tape_t
*tape
,
1159 struct ide_atapi_pc
*pc
,
1160 unsigned int length
, struct idetape_bh
*bh
)
1162 idetape_init_pc(pc
);
1164 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1166 pc
->idetape_callback
= &idetape_rw_callback
;
1168 atomic_set(&bh
->b_count
, 0);
1170 pc
->buf_size
= length
* tape
->blk_size
;
1171 pc
->req_xfer
= pc
->buf_size
;
1172 if (pc
->req_xfer
== tape
->buffer_size
)
1173 pc
->flags
|= PC_FLAG_DMA_RECOMMENDED
;
1176 static void idetape_create_write_cmd(idetape_tape_t
*tape
,
1177 struct ide_atapi_pc
*pc
,
1178 unsigned int length
, struct idetape_bh
*bh
)
1180 idetape_init_pc(pc
);
1182 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1184 pc
->idetape_callback
= &idetape_rw_callback
;
1185 pc
->flags
|= PC_FLAG_WRITING
;
1187 pc
->b_data
= bh
->b_data
;
1188 pc
->b_count
= atomic_read(&bh
->b_count
);
1190 pc
->buf_size
= length
* tape
->blk_size
;
1191 pc
->req_xfer
= pc
->buf_size
;
1192 if (pc
->req_xfer
== tape
->buffer_size
)
1193 pc
->flags
|= PC_FLAG_DMA_RECOMMENDED
;
1196 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
1197 struct request
*rq
, sector_t block
)
1199 idetape_tape_t
*tape
= drive
->driver_data
;
1200 struct ide_atapi_pc
*pc
= NULL
;
1201 struct request
*postponed_rq
= tape
->postponed_rq
;
1204 debug_log(DBG_SENSE
, "sector: %ld, nr_sectors: %ld,"
1205 " current_nr_sectors: %d\n",
1206 rq
->sector
, rq
->nr_sectors
, rq
->current_nr_sectors
);
1208 if (!blk_special_request(rq
)) {
1209 /* We do not support buffer cache originated requests. */
1210 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
1211 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
1212 ide_end_request(drive
, 0, 0);
1216 /* Retry a failed packet command */
1217 if (tape
->failed_pc
&& tape
->pc
->c
[0] == REQUEST_SENSE
)
1218 return idetape_issue_pc(drive
, tape
->failed_pc
);
1220 if (postponed_rq
!= NULL
)
1221 if (rq
!= postponed_rq
) {
1222 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
1223 "Two DSC requests were queued\n");
1224 idetape_end_request(drive
, 0, 0);
1228 tape
->postponed_rq
= NULL
;
1231 * If the tape is still busy, postpone our request and service
1232 * the other device meanwhile.
1234 stat
= ide_read_status(drive
);
1236 if (!drive
->dsc_overlap
&& !(rq
->cmd
[0] & REQ_IDETAPE_PC2
))
1237 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
1239 if (drive
->post_reset
== 1) {
1240 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
1241 drive
->post_reset
= 0;
1244 if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
) &&
1245 (stat
& SEEK_STAT
) == 0) {
1246 if (postponed_rq
== NULL
) {
1247 tape
->dsc_polling_start
= jiffies
;
1248 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
1249 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
1250 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
1251 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
1253 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1254 idetape_media_access_finished(drive
);
1257 return ide_do_reset(drive
);
1259 } else if (time_after(jiffies
,
1260 tape
->dsc_polling_start
+
1261 IDETAPE_DSC_MA_THRESHOLD
))
1262 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
1263 idetape_postpone_request(drive
);
1266 if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1267 pc
= idetape_next_pc_storage(drive
);
1268 idetape_create_read_cmd(tape
, pc
, rq
->current_nr_sectors
,
1269 (struct idetape_bh
*)rq
->special
);
1272 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1273 pc
= idetape_next_pc_storage(drive
);
1274 idetape_create_write_cmd(tape
, pc
, rq
->current_nr_sectors
,
1275 (struct idetape_bh
*)rq
->special
);
1278 if (rq
->cmd
[0] & REQ_IDETAPE_PC1
) {
1279 pc
= (struct ide_atapi_pc
*) rq
->buffer
;
1280 rq
->cmd
[0] &= ~(REQ_IDETAPE_PC1
);
1281 rq
->cmd
[0] |= REQ_IDETAPE_PC2
;
1284 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1285 idetape_media_access_finished(drive
);
1290 return idetape_issue_pc(drive
, pc
);
1294 * The function below uses __get_free_pages to allocate a data buffer of size
1295 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
1298 * It returns a pointer to the newly allocated buffer, or NULL in case of
1301 static idetape_stage_t
*ide_tape_kmalloc_buffer(idetape_tape_t
*tape
, int full
,
1304 idetape_stage_t
*stage
;
1305 struct idetape_bh
*prev_bh
, *bh
;
1306 int pages
= tape
->pages_per_buffer
;
1307 unsigned int order
, b_allocd
;
1308 char *b_data
= NULL
;
1310 stage
= kmalloc(sizeof(idetape_stage_t
), GFP_KERNEL
);
1315 stage
->bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1320 order
= fls(pages
) - 1;
1321 bh
->b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
1324 b_allocd
= (1 << order
) * PAGE_SIZE
;
1328 memset(bh
->b_data
, 0, b_allocd
);
1329 bh
->b_reqnext
= NULL
;
1330 bh
->b_size
= b_allocd
;
1331 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1334 order
= fls(pages
) - 1;
1335 b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
1338 b_allocd
= (1 << order
) * PAGE_SIZE
;
1341 memset(b_data
, 0, b_allocd
);
1343 /* newly allocated page frames below buffer header or ...*/
1344 if (bh
->b_data
== b_data
+ b_allocd
) {
1345 bh
->b_size
+= b_allocd
;
1346 bh
->b_data
-= b_allocd
;
1348 atomic_add(b_allocd
, &bh
->b_count
);
1351 /* they are above the header */
1352 if (b_data
== bh
->b_data
+ bh
->b_size
) {
1353 bh
->b_size
+= b_allocd
;
1355 atomic_add(b_allocd
, &bh
->b_count
);
1359 bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1361 free_pages((unsigned long) b_data
, order
);
1364 bh
->b_reqnext
= NULL
;
1365 bh
->b_data
= b_data
;
1366 bh
->b_size
= b_allocd
;
1367 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1368 prev_bh
->b_reqnext
= bh
;
1373 bh
->b_size
-= tape
->excess_bh_size
;
1375 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
1378 ide_tape_kfree_buffer(stage
);
1382 static int idetape_copy_stage_from_user(idetape_tape_t
*tape
,
1383 const char __user
*buf
, int n
)
1385 struct idetape_bh
*bh
= tape
->bh
;
1391 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1395 count
= min((unsigned int)
1396 (bh
->b_size
- atomic_read(&bh
->b_count
)),
1398 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
,
1402 atomic_add(count
, &bh
->b_count
);
1404 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
1407 atomic_set(&bh
->b_count
, 0);
1414 static int idetape_copy_stage_to_user(idetape_tape_t
*tape
, char __user
*buf
,
1417 struct idetape_bh
*bh
= tape
->bh
;
1423 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1427 count
= min(tape
->b_count
, n
);
1428 if (copy_to_user(buf
, tape
->b_data
, count
))
1431 tape
->b_data
+= count
;
1432 tape
->b_count
-= count
;
1434 if (!tape
->b_count
) {
1438 tape
->b_data
= bh
->b_data
;
1439 tape
->b_count
= atomic_read(&bh
->b_count
);
1446 static void idetape_init_merge_stage(idetape_tape_t
*tape
)
1448 struct idetape_bh
*bh
= tape
->merge_stage
->bh
;
1451 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1452 atomic_set(&bh
->b_count
, 0);
1454 tape
->b_data
= bh
->b_data
;
1455 tape
->b_count
= atomic_read(&bh
->b_count
);
1459 static ide_startstop_t
idetape_read_position_callback(ide_drive_t
*drive
)
1461 idetape_tape_t
*tape
= drive
->driver_data
;
1462 u8
*readpos
= tape
->pc
->buf
;
1464 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1466 if (!tape
->pc
->error
) {
1467 debug_log(DBG_SENSE
, "BOP - %s\n",
1468 (readpos
[0] & 0x80) ? "Yes" : "No");
1469 debug_log(DBG_SENSE
, "EOP - %s\n",
1470 (readpos
[0] & 0x40) ? "Yes" : "No");
1472 if (readpos
[0] & 0x4) {
1473 printk(KERN_INFO
"ide-tape: Block location is unknown"
1475 clear_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
);
1476 idetape_end_request(drive
, 0, 0);
1478 debug_log(DBG_SENSE
, "Block Location - %u\n",
1479 be32_to_cpu(*(u32
*)&readpos
[4]));
1481 tape
->partition
= readpos
[1];
1483 be32_to_cpu(*(u32
*)&readpos
[4]);
1484 set_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
);
1485 idetape_end_request(drive
, 1, 0);
1488 idetape_end_request(drive
, 0, 0);
1494 * Write a filemark if write_filemark=1. Flush the device buffers without
1495 * writing a filemark otherwise.
1497 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
1498 struct ide_atapi_pc
*pc
, int write_filemark
)
1500 idetape_init_pc(pc
);
1501 pc
->c
[0] = WRITE_FILEMARKS
;
1502 pc
->c
[4] = write_filemark
;
1503 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1504 pc
->idetape_callback
= &idetape_pc_callback
;
1507 static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc
*pc
)
1509 idetape_init_pc(pc
);
1510 pc
->c
[0] = TEST_UNIT_READY
;
1511 pc
->idetape_callback
= &idetape_pc_callback
;
1515 * We add a special packet command request to the tail of the request queue, and
1516 * wait for it to be serviced. This is not to be called from within the request
1517 * handling part of the driver! We allocate here data on the stack and it is
1518 * valid until the request is finished. This is not the case for the bottom part
1519 * of the driver, where we are always leaving the functions to wait for an
1520 * interrupt or a timer event.
1522 * From the bottom part of the driver, we should allocate safe memory using
1523 * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request
1524 * to the request list without waiting for it to be serviced! In that case, we
1525 * usually use idetape_queue_pc_head().
1527 static int idetape_queue_pc_tail(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
)
1529 struct ide_tape_obj
*tape
= drive
->driver_data
;
1532 idetape_init_rq(&rq
, REQ_IDETAPE_PC1
);
1533 rq
.buffer
= (char *) pc
;
1534 rq
.rq_disk
= tape
->disk
;
1535 return ide_do_drive_cmd(drive
, &rq
, ide_wait
);
1538 static void idetape_create_load_unload_cmd(ide_drive_t
*drive
,
1539 struct ide_atapi_pc
*pc
, int cmd
)
1541 idetape_init_pc(pc
);
1542 pc
->c
[0] = START_STOP
;
1544 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1545 pc
->idetape_callback
= &idetape_pc_callback
;
1548 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
1550 idetape_tape_t
*tape
= drive
->driver_data
;
1551 struct ide_atapi_pc pc
;
1552 int load_attempted
= 0;
1554 /* Wait for the tape to become ready */
1555 set_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
);
1557 while (time_before(jiffies
, timeout
)) {
1558 idetape_create_test_unit_ready_cmd(&pc
);
1559 if (!idetape_queue_pc_tail(drive
, &pc
))
1561 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
1562 || (tape
->asc
== 0x3A)) {
1566 idetape_create_load_unload_cmd(drive
, &pc
,
1567 IDETAPE_LU_LOAD_MASK
);
1568 idetape_queue_pc_tail(drive
, &pc
);
1570 /* not about to be ready */
1571 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
1572 (tape
->ascq
== 1 || tape
->ascq
== 8)))
1579 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
1581 struct ide_atapi_pc pc
;
1584 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
1585 rc
= idetape_queue_pc_tail(drive
, &pc
);
1588 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1592 static void idetape_create_read_position_cmd(struct ide_atapi_pc
*pc
)
1594 idetape_init_pc(pc
);
1595 pc
->c
[0] = READ_POSITION
;
1597 pc
->idetape_callback
= &idetape_read_position_callback
;
1600 static int idetape_read_position(ide_drive_t
*drive
)
1602 idetape_tape_t
*tape
= drive
->driver_data
;
1603 struct ide_atapi_pc pc
;
1606 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1608 idetape_create_read_position_cmd(&pc
);
1609 if (idetape_queue_pc_tail(drive
, &pc
))
1611 position
= tape
->first_frame
;
1615 static void idetape_create_locate_cmd(ide_drive_t
*drive
,
1616 struct ide_atapi_pc
*pc
,
1617 unsigned int block
, u8 partition
, int skip
)
1619 idetape_init_pc(pc
);
1620 pc
->c
[0] = POSITION_TO_ELEMENT
;
1622 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
1623 pc
->c
[8] = partition
;
1624 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1625 pc
->idetape_callback
= &idetape_pc_callback
;
1628 static int idetape_create_prevent_cmd(ide_drive_t
*drive
,
1629 struct ide_atapi_pc
*pc
, int prevent
)
1631 idetape_tape_t
*tape
= drive
->driver_data
;
1633 /* device supports locking according to capabilities page */
1634 if (!(tape
->caps
[6] & 0x01))
1637 idetape_init_pc(pc
);
1638 pc
->c
[0] = ALLOW_MEDIUM_REMOVAL
;
1640 pc
->idetape_callback
= &idetape_pc_callback
;
1644 static void __ide_tape_discard_merge_buffer(ide_drive_t
*drive
)
1646 idetape_tape_t
*tape
= drive
->driver_data
;
1648 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
1651 clear_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
);
1652 tape
->merge_stage_size
= 0;
1653 if (tape
->merge_stage
!= NULL
) {
1654 ide_tape_kfree_buffer(tape
->merge_stage
);
1655 tape
->merge_stage
= NULL
;
1658 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1662 * Position the tape to the requested block using the LOCATE packet command.
1663 * A READ POSITION command is then issued to check where we are positioned. Like
1664 * all higher level operations, we queue the commands at the tail of the request
1665 * queue and wait for their completion.
1667 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
1668 u8 partition
, int skip
)
1670 idetape_tape_t
*tape
= drive
->driver_data
;
1672 struct ide_atapi_pc pc
;
1674 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1675 __ide_tape_discard_merge_buffer(drive
);
1676 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1677 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
1678 retval
= idetape_queue_pc_tail(drive
, &pc
);
1682 idetape_create_read_position_cmd(&pc
);
1683 return (idetape_queue_pc_tail(drive
, &pc
));
1686 static void ide_tape_discard_merge_buffer(ide_drive_t
*drive
,
1687 int restore_position
)
1689 idetape_tape_t
*tape
= drive
->driver_data
;
1692 __ide_tape_discard_merge_buffer(drive
);
1693 if (restore_position
) {
1694 position
= idetape_read_position(drive
);
1695 seek
= position
> 0 ? position
: 0;
1696 if (idetape_position_tape(drive
, seek
, 0, 0)) {
1697 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
1698 " %s\n", tape
->name
, __func__
);
1705 * Generate a read/write request for the block device interface and wait for it
1708 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
,
1709 struct idetape_bh
*bh
)
1711 idetape_tape_t
*tape
= drive
->driver_data
;
1714 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
1716 idetape_init_rq(&rq
, cmd
);
1717 rq
.rq_disk
= tape
->disk
;
1718 rq
.special
= (void *)bh
;
1719 rq
.sector
= tape
->first_frame
;
1720 rq
.nr_sectors
= blocks
;
1721 rq
.current_nr_sectors
= blocks
;
1722 (void) ide_do_drive_cmd(drive
, &rq
, ide_wait
);
1724 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
1727 if (tape
->merge_stage
)
1728 idetape_init_merge_stage(tape
);
1729 if (rq
.errors
== IDETAPE_ERROR_GENERAL
)
1731 return (tape
->blk_size
* (blocks
-rq
.current_nr_sectors
));
1734 static void idetape_create_inquiry_cmd(struct ide_atapi_pc
*pc
)
1736 idetape_init_pc(pc
);
1740 pc
->idetape_callback
= &idetape_pc_callback
;
1743 static void idetape_create_rewind_cmd(ide_drive_t
*drive
,
1744 struct ide_atapi_pc
*pc
)
1746 idetape_init_pc(pc
);
1747 pc
->c
[0] = REZERO_UNIT
;
1748 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1749 pc
->idetape_callback
= &idetape_pc_callback
;
1752 static void idetape_create_erase_cmd(struct ide_atapi_pc
*pc
)
1754 idetape_init_pc(pc
);
1757 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1758 pc
->idetape_callback
= &idetape_pc_callback
;
1761 static void idetape_create_space_cmd(struct ide_atapi_pc
*pc
, int count
, u8 cmd
)
1763 idetape_init_pc(pc
);
1765 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
1767 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1768 pc
->idetape_callback
= &idetape_pc_callback
;
1771 /* Queue up a character device originated write request. */
1772 static int idetape_add_chrdev_write_request(ide_drive_t
*drive
, int blocks
)
1774 idetape_tape_t
*tape
= drive
->driver_data
;
1776 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1778 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
1779 blocks
, tape
->merge_stage
->bh
);
1782 static void idetape_empty_write_pipeline(ide_drive_t
*drive
)
1784 idetape_tape_t
*tape
= drive
->driver_data
;
1786 struct idetape_bh
*bh
;
1788 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1789 printk(KERN_ERR
"ide-tape: bug: Trying to empty write pipeline,"
1790 " but we are not writing.\n");
1793 if (tape
->merge_stage_size
> tape
->buffer_size
) {
1794 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
1795 tape
->merge_stage_size
= tape
->buffer_size
;
1797 if (tape
->merge_stage_size
) {
1798 blocks
= tape
->merge_stage_size
/ tape
->blk_size
;
1799 if (tape
->merge_stage_size
% tape
->blk_size
) {
1803 i
= tape
->blk_size
- tape
->merge_stage_size
%
1805 bh
= tape
->bh
->b_reqnext
;
1807 atomic_set(&bh
->b_count
, 0);
1813 printk(KERN_INFO
"ide-tape: bug,"
1817 min
= min(i
, (unsigned int)(bh
->b_size
-
1818 atomic_read(&bh
->b_count
)));
1819 memset(bh
->b_data
+ atomic_read(&bh
->b_count
),
1821 atomic_add(min
, &bh
->b_count
);
1826 (void) idetape_add_chrdev_write_request(drive
, blocks
);
1827 tape
->merge_stage_size
= 0;
1829 if (tape
->merge_stage
!= NULL
) {
1830 ide_tape_kfree_buffer(tape
->merge_stage
);
1831 tape
->merge_stage
= NULL
;
1833 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1836 static int idetape_init_read(ide_drive_t
*drive
)
1838 idetape_tape_t
*tape
= drive
->driver_data
;
1841 /* Initialize read operation */
1842 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1843 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1844 idetape_empty_write_pipeline(drive
);
1845 idetape_flush_tape_buffers(drive
);
1847 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
1848 printk(KERN_ERR
"ide-tape: merge_stage_size should be"
1850 tape
->merge_stage_size
= 0;
1852 tape
->merge_stage
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1853 if (!tape
->merge_stage
)
1855 tape
->chrdev_dir
= IDETAPE_DIR_READ
;
1858 * Issue a read 0 command to ensure that DSC handshake is
1859 * switched from completion mode to buffer available mode.
1860 * No point in issuing this if DSC overlap isn't supported, some
1861 * drives (Seagate STT3401A) will return an error.
1863 if (drive
->dsc_overlap
) {
1864 bytes_read
= idetape_queue_rw_tail(drive
,
1865 REQ_IDETAPE_READ
, 0,
1866 tape
->merge_stage
->bh
);
1867 if (bytes_read
< 0) {
1868 ide_tape_kfree_buffer(tape
->merge_stage
);
1869 tape
->merge_stage
= NULL
;
1870 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1879 /* called from idetape_chrdev_read() to service a chrdev read request. */
1880 static int idetape_add_chrdev_read_request(ide_drive_t
*drive
, int blocks
)
1882 idetape_tape_t
*tape
= drive
->driver_data
;
1884 debug_log(DBG_PROCS
, "Enter %s, %d blocks\n", __func__
, blocks
);
1886 /* If we are at a filemark, return a read length of 0 */
1887 if (test_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
))
1890 idetape_init_read(drive
);
1892 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
,
1893 tape
->merge_stage
->bh
);
1896 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
1898 idetape_tape_t
*tape
= drive
->driver_data
;
1899 struct idetape_bh
*bh
;
1905 bh
= tape
->merge_stage
->bh
;
1906 count
= min(tape
->buffer_size
, bcount
);
1908 blocks
= count
/ tape
->blk_size
;
1910 atomic_set(&bh
->b_count
,
1911 min(count
, (unsigned int)bh
->b_size
));
1912 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
1913 count
-= atomic_read(&bh
->b_count
);
1916 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
,
1917 tape
->merge_stage
->bh
);
1922 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1923 * currently support only one partition.
1925 static int idetape_rewind_tape(ide_drive_t
*drive
)
1928 struct ide_atapi_pc pc
;
1929 idetape_tape_t
*tape
;
1930 tape
= drive
->driver_data
;
1932 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
1934 idetape_create_rewind_cmd(drive
, &pc
);
1935 retval
= idetape_queue_pc_tail(drive
, &pc
);
1939 idetape_create_read_position_cmd(&pc
);
1940 retval
= idetape_queue_pc_tail(drive
, &pc
);
1946 /* mtio.h compatible commands should be issued to the chrdev interface. */
1947 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
1950 idetape_tape_t
*tape
= drive
->driver_data
;
1951 void __user
*argp
= (void __user
*)arg
;
1953 struct idetape_config
{
1954 int dsc_rw_frequency
;
1955 int dsc_media_access_frequency
;
1959 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1963 if (copy_from_user(&config
, argp
, sizeof(config
)))
1965 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
1968 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
1969 config
.nr_stages
= 1;
1970 if (copy_to_user(argp
, &config
, sizeof(config
)))
1979 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
1982 idetape_tape_t
*tape
= drive
->driver_data
;
1983 struct ide_atapi_pc pc
;
1984 int retval
, count
= 0;
1985 int sprev
= !!(tape
->caps
[4] & 0x20);
1989 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
1992 mt_count
= -mt_count
;
1995 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1996 tape
->merge_stage_size
= 0;
1997 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
))
1999 ide_tape_discard_merge_buffer(drive
, 0);
2003 * The filemark was not found in our internal pipeline; now we can issue
2004 * the space command.
2009 idetape_create_space_cmd(&pc
, mt_count
- count
,
2010 IDETAPE_SPACE_OVER_FILEMARK
);
2011 return idetape_queue_pc_tail(drive
, &pc
);
2016 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
2020 count
= (MTBSFM
== mt_op
? 1 : -1);
2021 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
2023 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
2030 * Our character device read / write functions.
2032 * The tape is optimized to maximize throughput when it is transferring an
2033 * integral number of the "continuous transfer limit", which is a parameter of
2034 * the specific tape (26kB on my particular tape, 32kB for Onstream).
2036 * As of version 1.3 of the driver, the character device provides an abstract
2037 * continuous view of the media - any mix of block sizes (even 1 byte) on the
2038 * same backup/restore procedure is supported. The driver will internally
2039 * convert the requests to the recommended transfer unit, so that an unmatch
2040 * between the user's block size to the recommended size will only result in a
2041 * (slightly) increased driver overhead, but will no longer hit performance.
2042 * This is not applicable to Onstream.
2044 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
2045 size_t count
, loff_t
*ppos
)
2047 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2048 ide_drive_t
*drive
= tape
->drive
;
2049 ssize_t bytes_read
, temp
, actually_read
= 0, rc
;
2051 u16 ctl
= *(u16
*)&tape
->caps
[12];
2053 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
2055 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
2056 if (test_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
))
2057 if (count
> tape
->blk_size
&&
2058 (count
% tape
->blk_size
) == 0)
2059 tape
->user_bs_factor
= count
/ tape
->blk_size
;
2061 rc
= idetape_init_read(drive
);
2066 if (tape
->merge_stage_size
) {
2067 actually_read
= min((unsigned int)(tape
->merge_stage_size
),
2068 (unsigned int)count
);
2069 if (idetape_copy_stage_to_user(tape
, buf
, actually_read
))
2071 buf
+= actually_read
;
2072 tape
->merge_stage_size
-= actually_read
;
2073 count
-= actually_read
;
2075 while (count
>= tape
->buffer_size
) {
2076 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
2077 if (bytes_read
<= 0)
2079 if (idetape_copy_stage_to_user(tape
, buf
, bytes_read
))
2082 count
-= bytes_read
;
2083 actually_read
+= bytes_read
;
2086 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
2087 if (bytes_read
<= 0)
2089 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
2090 if (idetape_copy_stage_to_user(tape
, buf
, temp
))
2092 actually_read
+= temp
;
2093 tape
->merge_stage_size
= bytes_read
-temp
;
2096 if (!actually_read
&& test_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
)) {
2097 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
2099 idetape_space_over_filemarks(drive
, MTFSF
, 1);
2103 return ret
? ret
: actually_read
;
2106 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
2107 size_t count
, loff_t
*ppos
)
2109 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2110 ide_drive_t
*drive
= tape
->drive
;
2111 ssize_t actually_written
= 0;
2113 u16 ctl
= *(u16
*)&tape
->caps
[12];
2115 /* The drive is write protected. */
2116 if (tape
->write_prot
)
2119 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
2121 /* Initialize write operation */
2122 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
2123 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
2124 ide_tape_discard_merge_buffer(drive
, 1);
2125 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
2126 printk(KERN_ERR
"ide-tape: merge_stage_size "
2127 "should be 0 now\n");
2128 tape
->merge_stage_size
= 0;
2130 tape
->merge_stage
= ide_tape_kmalloc_buffer(tape
, 0, 0);
2131 if (!tape
->merge_stage
)
2133 tape
->chrdev_dir
= IDETAPE_DIR_WRITE
;
2134 idetape_init_merge_stage(tape
);
2137 * Issue a write 0 command to ensure that DSC handshake is
2138 * switched from completion mode to buffer available mode. No
2139 * point in issuing this if DSC overlap isn't supported, some
2140 * drives (Seagate STT3401A) will return an error.
2142 if (drive
->dsc_overlap
) {
2143 ssize_t retval
= idetape_queue_rw_tail(drive
,
2144 REQ_IDETAPE_WRITE
, 0,
2145 tape
->merge_stage
->bh
);
2147 ide_tape_kfree_buffer(tape
->merge_stage
);
2148 tape
->merge_stage
= NULL
;
2149 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2156 if (tape
->merge_stage_size
) {
2157 if (tape
->merge_stage_size
>= tape
->buffer_size
) {
2158 printk(KERN_ERR
"ide-tape: bug: merge buf too big\n");
2159 tape
->merge_stage_size
= 0;
2161 actually_written
= min((unsigned int)
2162 (tape
->buffer_size
- tape
->merge_stage_size
),
2163 (unsigned int)count
);
2164 if (idetape_copy_stage_from_user(tape
, buf
, actually_written
))
2166 buf
+= actually_written
;
2167 tape
->merge_stage_size
+= actually_written
;
2168 count
-= actually_written
;
2170 if (tape
->merge_stage_size
== tape
->buffer_size
) {
2172 tape
->merge_stage_size
= 0;
2173 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
2178 while (count
>= tape
->buffer_size
) {
2180 if (idetape_copy_stage_from_user(tape
, buf
, tape
->buffer_size
))
2182 buf
+= tape
->buffer_size
;
2183 count
-= tape
->buffer_size
;
2184 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
2185 actually_written
+= tape
->buffer_size
;
2190 actually_written
+= count
;
2191 if (idetape_copy_stage_from_user(tape
, buf
, count
))
2193 tape
->merge_stage_size
+= count
;
2195 return ret
? ret
: actually_written
;
2198 static int idetape_write_filemark(ide_drive_t
*drive
)
2200 struct ide_atapi_pc pc
;
2202 /* Write a filemark */
2203 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
2204 if (idetape_queue_pc_tail(drive
, &pc
)) {
2205 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
2212 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
2215 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
2216 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
2217 * usually not supported.
2219 * The following commands are currently not supported:
2221 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
2222 * MT_ST_WRITE_THRESHOLD.
2224 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
2226 idetape_tape_t
*tape
= drive
->driver_data
;
2227 struct ide_atapi_pc pc
;
2230 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
2240 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
2247 if (tape
->write_prot
)
2249 ide_tape_discard_merge_buffer(drive
, 1);
2250 for (i
= 0; i
< mt_count
; i
++) {
2251 retval
= idetape_write_filemark(drive
);
2257 ide_tape_discard_merge_buffer(drive
, 0);
2258 if (idetape_rewind_tape(drive
))
2262 ide_tape_discard_merge_buffer(drive
, 0);
2263 idetape_create_load_unload_cmd(drive
, &pc
,
2264 IDETAPE_LU_LOAD_MASK
);
2265 return idetape_queue_pc_tail(drive
, &pc
);
2269 * If door is locked, attempt to unlock before
2270 * attempting to eject.
2272 if (tape
->door_locked
) {
2273 if (idetape_create_prevent_cmd(drive
, &pc
, 0))
2274 if (!idetape_queue_pc_tail(drive
, &pc
))
2275 tape
->door_locked
= DOOR_UNLOCKED
;
2277 ide_tape_discard_merge_buffer(drive
, 0);
2278 idetape_create_load_unload_cmd(drive
, &pc
,
2279 !IDETAPE_LU_LOAD_MASK
);
2280 retval
= idetape_queue_pc_tail(drive
, &pc
);
2282 clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
);
2285 ide_tape_discard_merge_buffer(drive
, 0);
2286 return idetape_flush_tape_buffers(drive
);
2288 ide_tape_discard_merge_buffer(drive
, 0);
2289 idetape_create_load_unload_cmd(drive
, &pc
,
2290 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
2291 return idetape_queue_pc_tail(drive
, &pc
);
2293 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
2294 return idetape_queue_pc_tail(drive
, &pc
);
2296 (void)idetape_rewind_tape(drive
);
2297 idetape_create_erase_cmd(&pc
);
2298 return idetape_queue_pc_tail(drive
, &pc
);
2301 if (mt_count
< tape
->blk_size
||
2302 mt_count
% tape
->blk_size
)
2304 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
2305 clear_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
);
2307 set_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
);
2310 ide_tape_discard_merge_buffer(drive
, 0);
2311 return idetape_position_tape(drive
,
2312 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
2314 ide_tape_discard_merge_buffer(drive
, 0);
2315 return idetape_position_tape(drive
, 0, mt_count
, 0);
2319 if (!idetape_create_prevent_cmd(drive
, &pc
, 1))
2321 retval
= idetape_queue_pc_tail(drive
, &pc
);
2324 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
2327 if (!idetape_create_prevent_cmd(drive
, &pc
, 0))
2329 retval
= idetape_queue_pc_tail(drive
, &pc
);
2332 tape
->door_locked
= DOOR_UNLOCKED
;
2335 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
2342 * Our character device ioctls. General mtio.h magnetic io commands are
2343 * supported here, and not in the corresponding block interface. Our own
2344 * ide-tape ioctls are supported on both interfaces.
2346 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
2347 unsigned int cmd
, unsigned long arg
)
2349 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2350 ide_drive_t
*drive
= tape
->drive
;
2354 int block_offset
= 0, position
= tape
->first_frame
;
2355 void __user
*argp
= (void __user
*)arg
;
2357 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
2359 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
2360 idetape_empty_write_pipeline(drive
);
2361 idetape_flush_tape_buffers(drive
);
2363 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
2364 block_offset
= tape
->merge_stage_size
/
2365 (tape
->blk_size
* tape
->user_bs_factor
);
2366 position
= idetape_read_position(drive
);
2372 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
2374 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
2376 memset(&mtget
, 0, sizeof(struct mtget
));
2377 mtget
.mt_type
= MT_ISSCSI2
;
2378 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
2380 ((tape
->blk_size
* tape
->user_bs_factor
)
2381 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
2383 if (tape
->drv_write_prot
)
2384 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
2386 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
2390 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
2391 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
2395 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
2396 ide_tape_discard_merge_buffer(drive
, 1);
2397 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
2402 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
2403 * block size with the reported value.
2405 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
2407 idetape_tape_t
*tape
= drive
->driver_data
;
2408 struct ide_atapi_pc pc
;
2410 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
2411 if (idetape_queue_pc_tail(drive
, &pc
)) {
2412 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
2413 if (tape
->blk_size
== 0) {
2414 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
2415 "block size, assuming 32k\n");
2416 tape
->blk_size
= 32768;
2420 tape
->blk_size
= (pc
.buf
[4 + 5] << 16) +
2421 (pc
.buf
[4 + 6] << 8) +
2423 tape
->drv_write_prot
= (pc
.buf
[2] & 0x80) >> 7;
2426 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
2428 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
2430 idetape_tape_t
*tape
;
2431 struct ide_atapi_pc pc
;
2434 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
2437 tape
= ide_tape_chrdev_get(i
);
2441 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2444 * We really want to do nonseekable_open(inode, filp); here, but some
2445 * versions of tar incorrectly call lseek on tapes and bail out if that
2446 * fails. So we disallow pread() and pwrite(), but permit lseeks.
2448 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
2450 drive
= tape
->drive
;
2452 filp
->private_data
= tape
;
2454 if (test_and_set_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
)) {
2459 retval
= idetape_wait_ready(drive
, 60 * HZ
);
2461 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2462 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
2466 idetape_read_position(drive
);
2467 if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
))
2468 (void)idetape_rewind_tape(drive
);
2470 /* Read block size and write protect status from drive. */
2471 ide_tape_get_bsize_from_bdesc(drive
);
2473 /* Set write protect flag if device is opened as read-only. */
2474 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
2475 tape
->write_prot
= 1;
2477 tape
->write_prot
= tape
->drv_write_prot
;
2479 /* Make sure drive isn't write protected if user wants to write. */
2480 if (tape
->write_prot
) {
2481 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
2482 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
2483 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2489 /* Lock the tape drive door so user can't eject. */
2490 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2491 if (idetape_create_prevent_cmd(drive
, &pc
, 1)) {
2492 if (!idetape_queue_pc_tail(drive
, &pc
)) {
2493 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
2494 tape
->door_locked
= DOOR_LOCKED
;
2505 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
2507 idetape_tape_t
*tape
= drive
->driver_data
;
2509 idetape_empty_write_pipeline(drive
);
2510 tape
->merge_stage
= ide_tape_kmalloc_buffer(tape
, 1, 0);
2511 if (tape
->merge_stage
!= NULL
) {
2512 idetape_pad_zeros(drive
, tape
->blk_size
*
2513 (tape
->user_bs_factor
- 1));
2514 ide_tape_kfree_buffer(tape
->merge_stage
);
2515 tape
->merge_stage
= NULL
;
2517 idetape_write_filemark(drive
);
2518 idetape_flush_tape_buffers(drive
);
2519 idetape_flush_tape_buffers(drive
);
2522 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
2524 struct ide_tape_obj
*tape
= ide_tape_f(filp
);
2525 ide_drive_t
*drive
= tape
->drive
;
2526 struct ide_atapi_pc pc
;
2527 unsigned int minor
= iminor(inode
);
2530 tape
= drive
->driver_data
;
2532 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2534 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
2535 idetape_write_release(drive
, minor
);
2536 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
2538 ide_tape_discard_merge_buffer(drive
, 1);
2541 if (minor
< 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
))
2542 (void) idetape_rewind_tape(drive
);
2543 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2544 if (tape
->door_locked
== DOOR_LOCKED
) {
2545 if (idetape_create_prevent_cmd(drive
, &pc
, 0)) {
2546 if (!idetape_queue_pc_tail(drive
, &pc
))
2547 tape
->door_locked
= DOOR_UNLOCKED
;
2551 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2558 * check the contents of the ATAPI IDENTIFY command results. We return:
2560 * 1 - If the tape can be supported by us, based on the information we have so
2563 * 0 - If this tape driver is not currently supported by us.
2565 static int idetape_identify_device(ide_drive_t
*drive
)
2567 u8 gcw
[2], protocol
, device_type
, removable
, packet_size
;
2569 if (drive
->id_read
== 0)
2572 *((unsigned short *) &gcw
) = drive
->id
->config
;
2574 protocol
= (gcw
[1] & 0xC0) >> 6;
2575 device_type
= gcw
[1] & 0x1F;
2576 removable
= !!(gcw
[0] & 0x80);
2577 packet_size
= gcw
[0] & 0x3;
2579 /* Check that we can support this device */
2581 printk(KERN_ERR
"ide-tape: Protocol (0x%02x) is not ATAPI\n",
2583 else if (device_type
!= 1)
2584 printk(KERN_ERR
"ide-tape: Device type (0x%02x) is not set "
2585 "to tape\n", device_type
);
2586 else if (!removable
)
2587 printk(KERN_ERR
"ide-tape: The removable flag is not set\n");
2588 else if (packet_size
!= 0) {
2589 printk(KERN_ERR
"ide-tape: Packet size (0x%02x) is not 12"
2590 " bytes\n", packet_size
);
2596 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
2598 idetape_tape_t
*tape
= drive
->driver_data
;
2599 struct ide_atapi_pc pc
;
2600 char fw_rev
[6], vendor_id
[10], product_id
[18];
2602 idetape_create_inquiry_cmd(&pc
);
2603 if (idetape_queue_pc_tail(drive
, &pc
)) {
2604 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
2608 memcpy(vendor_id
, &pc
.buf
[8], 8);
2609 memcpy(product_id
, &pc
.buf
[16], 16);
2610 memcpy(fw_rev
, &pc
.buf
[32], 4);
2612 ide_fixstring(vendor_id
, 10, 0);
2613 ide_fixstring(product_id
, 18, 0);
2614 ide_fixstring(fw_rev
, 6, 0);
2616 printk(KERN_INFO
"ide-tape: %s <-> %s: %s %s rev %s\n",
2617 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
2621 * Ask the tape about its various parameters. In particular, we will adjust our
2622 * data transfer buffer size to the recommended value as returned by the tape.
2624 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
2626 idetape_tape_t
*tape
= drive
->driver_data
;
2627 struct ide_atapi_pc pc
;
2629 u8 speed
, max_speed
;
2631 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
2632 if (idetape_queue_pc_tail(drive
, &pc
)) {
2633 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
2634 " some default values\n");
2635 tape
->blk_size
= 512;
2636 put_unaligned(52, (u16
*)&tape
->caps
[12]);
2637 put_unaligned(540, (u16
*)&tape
->caps
[14]);
2638 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
2641 caps
= pc
.buf
+ 4 + pc
.buf
[3];
2643 /* convert to host order and save for later use */
2644 speed
= be16_to_cpu(*(u16
*)&caps
[14]);
2645 max_speed
= be16_to_cpu(*(u16
*)&caps
[8]);
2647 put_unaligned(max_speed
, (u16
*)&caps
[8]);
2648 put_unaligned(be16_to_cpu(*(u16
*)&caps
[12]), (u16
*)&caps
[12]);
2649 put_unaligned(speed
, (u16
*)&caps
[14]);
2650 put_unaligned(be16_to_cpu(*(u16
*)&caps
[16]), (u16
*)&caps
[16]);
2653 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
2654 "(assuming 650KB/sec)\n", drive
->name
);
2655 put_unaligned(650, (u16
*)&caps
[14]);
2658 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
2659 "(assuming 650KB/sec)\n", drive
->name
);
2660 put_unaligned(650, (u16
*)&caps
[8]);
2663 memcpy(&tape
->caps
, caps
, 20);
2665 tape
->blk_size
= 512;
2666 else if (caps
[7] & 0x04)
2667 tape
->blk_size
= 1024;
2670 #ifdef CONFIG_IDE_PROC_FS
2671 static void idetape_add_settings(ide_drive_t
*drive
)
2673 idetape_tape_t
*tape
= drive
->driver_data
;
2675 ide_add_setting(drive
, "buffer", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
2676 1, 2, (u16
*)&tape
->caps
[16], NULL
);
2677 ide_add_setting(drive
, "speed", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
2678 1, 1, (u16
*)&tape
->caps
[14], NULL
);
2679 ide_add_setting(drive
, "buffer_size", SETTING_READ
, TYPE_INT
, 0, 0xffff,
2680 1, 1024, &tape
->buffer_size
, NULL
);
2681 ide_add_setting(drive
, "tdsc", SETTING_RW
, TYPE_INT
, IDETAPE_DSC_RW_MIN
,
2682 IDETAPE_DSC_RW_MAX
, 1000, HZ
, &tape
->best_dsc_rw_freq
,
2684 ide_add_setting(drive
, "dsc_overlap", SETTING_RW
, TYPE_BYTE
, 0, 1, 1,
2685 1, &drive
->dsc_overlap
, NULL
);
2686 ide_add_setting(drive
, "avg_speed", SETTING_READ
, TYPE_INT
, 0, 0xffff,
2687 1, 1, &tape
->avg_speed
, NULL
);
2688 ide_add_setting(drive
, "debug_mask", SETTING_RW
, TYPE_INT
, 0, 0xffff, 1,
2689 1, &tape
->debug_mask
, NULL
);
2692 static inline void idetape_add_settings(ide_drive_t
*drive
) { ; }
2696 * The function below is called to:
2698 * 1. Initialize our various state variables.
2699 * 2. Ask the tape for its capabilities.
2700 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2701 * is chosen based on the recommendation which we received in step 2.
2703 * Note that at this point ide.c already assigned us an irq, so that we can
2704 * queue requests here and wait for their completion.
2706 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
2712 u16
*ctl
= (u16
*)&tape
->caps
[12];
2714 spin_lock_init(&tape
->lock
);
2715 drive
->dsc_overlap
= 1;
2716 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
2717 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
2719 drive
->dsc_overlap
= 0;
2721 /* Seagate Travan drives do not support DSC overlap. */
2722 if (strstr(drive
->id
->model
, "Seagate STT3401"))
2723 drive
->dsc_overlap
= 0;
2724 tape
->minor
= minor
;
2725 tape
->name
[0] = 'h';
2726 tape
->name
[1] = 't';
2727 tape
->name
[2] = '0' + minor
;
2728 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2729 tape
->pc
= tape
->pc_stack
;
2730 *((unsigned short *) &gcw
) = drive
->id
->config
;
2732 /* Command packet DRQ type */
2733 if (((gcw
[0] & 0x60) >> 5) == 1)
2734 set_bit(IDETAPE_FLAG_DRQ_INTERRUPT
, &tape
->flags
);
2736 idetape_get_inquiry_results(drive
);
2737 idetape_get_mode_sense_results(drive
);
2738 ide_tape_get_bsize_from_bdesc(drive
);
2739 tape
->user_bs_factor
= 1;
2740 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2741 while (tape
->buffer_size
> 0xffff) {
2742 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
2744 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2746 buffer_size
= tape
->buffer_size
;
2747 tape
->pages_per_buffer
= buffer_size
/ PAGE_SIZE
;
2748 if (buffer_size
% PAGE_SIZE
) {
2749 tape
->pages_per_buffer
++;
2750 tape
->excess_bh_size
= PAGE_SIZE
- buffer_size
% PAGE_SIZE
;
2753 /* select the "best" DSC read/write polling freq */
2754 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
2756 t
= (IDETAPE_FIFO_THRESHOLD
* tape
->buffer_size
* HZ
) / (speed
* 1000);
2759 * Ensure that the number we got makes sense; limit it within
2760 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2762 tape
->best_dsc_rw_freq
= max_t(unsigned long,
2763 min_t(unsigned long, t
, IDETAPE_DSC_RW_MAX
),
2764 IDETAPE_DSC_RW_MIN
);
2765 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2767 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
2768 (*(u16
*)&tape
->caps
[16] * 512) / tape
->buffer_size
,
2769 tape
->buffer_size
/ 1024,
2770 tape
->best_dsc_rw_freq
* 1000 / HZ
,
2771 drive
->using_dma
? ", DMA":"");
2773 idetape_add_settings(drive
);
2776 static void ide_tape_remove(ide_drive_t
*drive
)
2778 idetape_tape_t
*tape
= drive
->driver_data
;
2780 ide_proc_unregister_driver(drive
, tape
->driver
);
2782 ide_unregister_region(tape
->disk
);
2787 static void ide_tape_release(struct kref
*kref
)
2789 struct ide_tape_obj
*tape
= to_ide_tape(kref
);
2790 ide_drive_t
*drive
= tape
->drive
;
2791 struct gendisk
*g
= tape
->disk
;
2793 BUG_ON(tape
->merge_stage_size
);
2795 drive
->dsc_overlap
= 0;
2796 drive
->driver_data
= NULL
;
2797 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
2798 device_destroy(idetape_sysfs_class
,
2799 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
2800 idetape_devs
[tape
->minor
] = NULL
;
2801 g
->private_data
= NULL
;
2806 #ifdef CONFIG_IDE_PROC_FS
2807 static int proc_idetape_read_name
2808 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
2810 ide_drive_t
*drive
= (ide_drive_t
*) data
;
2811 idetape_tape_t
*tape
= drive
->driver_data
;
2815 len
= sprintf(out
, "%s\n", tape
->name
);
2816 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
2819 static ide_proc_entry_t idetape_proc
[] = {
2820 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
2821 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
2822 { NULL
, 0, NULL
, NULL
}
2826 static int ide_tape_probe(ide_drive_t
*);
2828 static ide_driver_t idetape_driver
= {
2830 .owner
= THIS_MODULE
,
2832 .bus
= &ide_bus_type
,
2834 .probe
= ide_tape_probe
,
2835 .remove
= ide_tape_remove
,
2836 .version
= IDETAPE_VERSION
,
2838 .supports_dsc_overlap
= 1,
2839 .do_request
= idetape_do_request
,
2840 .end_request
= idetape_end_request
,
2841 .error
= __ide_error
,
2842 .abort
= __ide_abort
,
2843 #ifdef CONFIG_IDE_PROC_FS
2844 .proc
= idetape_proc
,
2848 /* Our character device supporting functions, passed to register_chrdev. */
2849 static const struct file_operations idetape_fops
= {
2850 .owner
= THIS_MODULE
,
2851 .read
= idetape_chrdev_read
,
2852 .write
= idetape_chrdev_write
,
2853 .ioctl
= idetape_chrdev_ioctl
,
2854 .open
= idetape_chrdev_open
,
2855 .release
= idetape_chrdev_release
,
2858 static int idetape_open(struct inode
*inode
, struct file
*filp
)
2860 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
2861 struct ide_tape_obj
*tape
;
2863 tape
= ide_tape_get(disk
);
2870 static int idetape_release(struct inode
*inode
, struct file
*filp
)
2872 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
2873 struct ide_tape_obj
*tape
= ide_tape_g(disk
);
2880 static int idetape_ioctl(struct inode
*inode
, struct file
*file
,
2881 unsigned int cmd
, unsigned long arg
)
2883 struct block_device
*bdev
= inode
->i_bdev
;
2884 struct ide_tape_obj
*tape
= ide_tape_g(bdev
->bd_disk
);
2885 ide_drive_t
*drive
= tape
->drive
;
2886 int err
= generic_ide_ioctl(drive
, file
, bdev
, cmd
, arg
);
2888 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
2892 static struct block_device_operations idetape_block_ops
= {
2893 .owner
= THIS_MODULE
,
2894 .open
= idetape_open
,
2895 .release
= idetape_release
,
2896 .ioctl
= idetape_ioctl
,
2899 static int ide_tape_probe(ide_drive_t
*drive
)
2901 idetape_tape_t
*tape
;
2905 if (!strstr("ide-tape", drive
->driver_req
))
2907 if (!drive
->present
)
2909 if (drive
->media
!= ide_tape
)
2911 if (!idetape_identify_device(drive
)) {
2912 printk(KERN_ERR
"ide-tape: %s: not supported by this version of"
2913 " the driver\n", drive
->name
);
2917 printk(KERN_INFO
"ide-tape: passing drive %s to ide-scsi"
2918 " emulation.\n", drive
->name
);
2921 tape
= kzalloc(sizeof(idetape_tape_t
), GFP_KERNEL
);
2923 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape struct\n",
2928 g
= alloc_disk(1 << PARTN_BITS
);
2932 ide_init_disk(g
, drive
);
2934 ide_proc_register_driver(drive
, &idetape_driver
);
2936 kref_init(&tape
->kref
);
2938 tape
->drive
= drive
;
2939 tape
->driver
= &idetape_driver
;
2942 g
->private_data
= &tape
->driver
;
2944 drive
->driver_data
= tape
;
2946 mutex_lock(&idetape_ref_mutex
);
2947 for (minor
= 0; idetape_devs
[minor
]; minor
++)
2949 idetape_devs
[minor
] = tape
;
2950 mutex_unlock(&idetape_ref_mutex
);
2952 idetape_setup(drive
, tape
, minor
);
2954 device_create(idetape_sysfs_class
, &drive
->gendev
,
2955 MKDEV(IDETAPE_MAJOR
, minor
), "%s", tape
->name
);
2956 device_create(idetape_sysfs_class
, &drive
->gendev
,
2957 MKDEV(IDETAPE_MAJOR
, minor
+ 128), "n%s", tape
->name
);
2959 g
->fops
= &idetape_block_ops
;
2960 ide_register_region(g
);
2970 static void __exit
idetape_exit(void)
2972 driver_unregister(&idetape_driver
.gen_driver
);
2973 class_destroy(idetape_sysfs_class
);
2974 unregister_chrdev(IDETAPE_MAJOR
, "ht");
2977 static int __init
idetape_init(void)
2980 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
2981 if (IS_ERR(idetape_sysfs_class
)) {
2982 idetape_sysfs_class
= NULL
;
2983 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
2988 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
2989 printk(KERN_ERR
"ide-tape: Failed to register chrdev"
2992 goto out_free_class
;
2995 error
= driver_register(&idetape_driver
.gen_driver
);
2997 goto out_free_driver
;
3002 driver_unregister(&idetape_driver
.gen_driver
);
3004 class_destroy(idetape_sysfs_class
);
3009 MODULE_ALIAS("ide:*m-tape*");
3010 module_init(idetape_init
);
3011 module_exit(idetape_exit
);
3012 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);
3013 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
3014 MODULE_LICENSE("GPL");