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 "1.19"
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>
43 #include <asm/uaccess.h>
45 #include <asm/unaligned.h>
46 #include <linux/mtio.h>
48 /**************************** Tunable parameters *****************************/
52 * Pipelined mode parameters.
54 * We try to use the minimum number of stages which is enough to
55 * keep the tape constantly streaming. To accomplish that, we implement
56 * a feedback loop around the maximum number of stages:
58 * We start from MIN maximum stages (we will not even use MIN stages
59 * if we don't need them), increment it by RATE*(MAX-MIN)
60 * whenever we sense that the pipeline is empty, until we reach
61 * the optimum value or until we reach MAX.
63 * Setting the following parameter to 0 is illegal: the pipelined mode
64 * cannot be disabled (calculate_speeds() divides by tape->max_stages.)
66 #define IDETAPE_MIN_PIPELINE_STAGES 1
67 #define IDETAPE_MAX_PIPELINE_STAGES 400
68 #define IDETAPE_INCREASE_STAGES_RATE 20
71 * The following are used to debug the driver:
73 * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control.
75 * Setting them to 0 will restore normal operation mode:
77 * 1. Disable logging normal successful operations.
78 * 2. Disable self-sanity checks.
79 * 3. Errors will still be logged, of course.
81 * All the #if DEBUG code will be removed some day, when the driver
82 * is verified to be stable enough. This will make it much more
85 #define IDETAPE_DEBUG_LOG 0
88 * After each failed packet command we issue a request sense command
89 * and retry the packet command IDETAPE_MAX_PC_RETRIES times.
91 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
93 #define IDETAPE_MAX_PC_RETRIES 3
96 * With each packet command, we allocate a buffer of
97 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
98 * commands (Not for READ/WRITE commands).
100 #define IDETAPE_PC_BUFFER_SIZE 256
103 * In various places in the driver, we need to allocate storage
104 * for packet commands and requests, which will remain valid while
105 * we leave the driver to wait for an interrupt or a timeout event.
107 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
110 * Some drives (for example, Seagate STT3401A Travan) require a very long
111 * timeout, because they don't return an interrupt or clear their busy bit
112 * until after the command completes (even retension commands).
114 #define IDETAPE_WAIT_CMD (900*HZ)
117 * The following parameter is used to select the point in the internal
118 * tape fifo in which we will start to refill the buffer. Decreasing
119 * the following parameter will improve the system's latency and
120 * interactive response, while using a high value might improve system
123 #define IDETAPE_FIFO_THRESHOLD 2
126 * DSC polling parameters.
128 * Polling for DSC (a single bit in the status register) is a very
129 * important function in ide-tape. There are two cases in which we
132 * 1. Before a read/write packet command, to ensure that we
133 * can transfer data from/to the tape's data buffers, without
134 * causing an actual media access. In case the tape is not
135 * ready yet, we take out our request from the device
136 * request queue, so that ide.c will service requests from
137 * the other device on the same interface meanwhile.
139 * 2. After the successful initialization of a "media access
140 * packet command", which is a command which can take a long
141 * time to complete (it can be several seconds or even an hour).
143 * Again, we postpone our request in the middle to free the bus
144 * for the other device. The polling frequency here should be
145 * lower than the read/write frequency since those media access
146 * commands are slow. We start from a "fast" frequency -
147 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
148 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
149 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
151 * We also set a timeout for the timer, in case something goes wrong.
152 * The timeout should be longer then the maximum execution time of a
159 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
160 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
161 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
162 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
163 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
164 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
165 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
167 /*************************** End of tunable parameters ***********************/
170 * Read/Write error simulation
172 #define SIMULATE_ERRORS 0
175 * For general magnetic tape device compatibility.
178 idetape_direction_none
,
179 idetape_direction_read
,
180 idetape_direction_write
181 } idetape_chrdev_direction_t
;
186 struct idetape_bh
*b_reqnext
;
191 * Our view of a packet command.
193 typedef struct idetape_packet_command_s
{
194 u8 c
[12]; /* Actual packet bytes */
195 int retries
; /* On each retry, we increment retries */
196 int error
; /* Error code */
197 int request_transfer
; /* Bytes to transfer */
198 int actually_transferred
; /* Bytes actually transferred */
199 int buffer_size
; /* Size of our data buffer */
200 struct idetape_bh
*bh
;
203 u8
*buffer
; /* Data buffer */
204 u8
*current_position
; /* Pointer into the above buffer */
205 ide_startstop_t (*callback
) (ide_drive_t
*); /* Called when this packet command is completed */
206 u8 pc_buffer
[IDETAPE_PC_BUFFER_SIZE
]; /* Temporary buffer */
207 unsigned long flags
; /* Status/Action bit flags: long for set_bit */
211 * Packet command flag bits.
213 /* Set when an error is considered normal - We won't retry */
215 /* 1 When polling for DSC on a media access command */
216 #define PC_WAIT_FOR_DSC 1
217 /* 1 when we prefer to use DMA if possible */
218 #define PC_DMA_RECOMMENDED 2
219 /* 1 while DMA in progress */
220 #define PC_DMA_IN_PROGRESS 3
221 /* 1 when encountered problem during DMA */
222 #define PC_DMA_ERROR 4
229 typedef struct idetape_stage_s
{
230 struct request rq
; /* The corresponding request */
231 struct idetape_bh
*bh
; /* The data buffers */
232 struct idetape_stage_s
*next
; /* Pointer to the next stage */
236 * Most of our global data which we need to save even as we leave the
237 * driver due to an interrupt or a timer event is stored in a variable
238 * of type idetape_tape_t, defined below.
240 typedef struct ide_tape_obj
{
242 ide_driver_t
*driver
;
243 struct gendisk
*disk
;
247 * Since a typical character device operation requires more
248 * than one packet command, we provide here enough memory
249 * for the maximum of interconnected packet commands.
250 * The packet commands are stored in the circular array pc_stack.
251 * pc_stack_index points to the last used entry, and warps around
252 * to the start when we get to the last array entry.
254 * pc points to the current processed packet command.
256 * failed_pc points to the last failed packet command, or contains
257 * NULL if we do not need to retry any packet command. This is
258 * required since an additional packet command is needed before the
259 * retry, to get detailed information on what went wrong.
261 /* Current packet command */
263 /* Last failed packet command */
264 idetape_pc_t
*failed_pc
;
265 /* Packet command stack */
266 idetape_pc_t pc_stack
[IDETAPE_PC_STACK
];
267 /* Next free packet command storage space */
269 struct request rq_stack
[IDETAPE_PC_STACK
];
270 /* We implement a circular array */
274 * DSC polling variables.
276 * While polling for DSC we use postponed_rq to postpone the
277 * current request so that ide.c will be able to service
278 * pending requests on the other device. Note that at most
279 * we will have only one DSC (usually data transfer) request
280 * in the device request queue. Additional requests can be
281 * queued in our internal pipeline, but they will be visible
282 * to ide.c only one at a time.
284 struct request
*postponed_rq
;
285 /* The time in which we started polling for DSC */
286 unsigned long dsc_polling_start
;
287 /* Timer used to poll for dsc */
288 struct timer_list dsc_timer
;
289 /* Read/Write dsc polling frequency */
290 unsigned long best_dsc_rw_frequency
;
291 /* The current polling frequency */
292 unsigned long dsc_polling_frequency
;
293 /* Maximum waiting time */
294 unsigned long dsc_timeout
;
297 * Read position information
301 unsigned int first_frame_position
;
302 unsigned int last_frame_position
;
303 unsigned int blocks_in_buffer
;
306 * Last error information
308 u8 sense_key
, asc
, ascq
;
311 * Character device operation
316 /* Current character device data transfer direction */
317 idetape_chrdev_direction_t chrdev_direction
;
322 /* Usually 512 or 1024 bytes */
323 unsigned short tape_block_size
;
326 /* Copy of the tape's Capabilities and Mechanical Page */
330 * Active data transfer request parameters.
332 * At most, there is only one ide-tape originated data transfer
333 * request in the device request queue. This allows ide.c to
334 * easily service requests from the other device when we
335 * postpone our active request. In the pipelined operation
336 * mode, we use our internal pipeline structure to hold
337 * more data requests.
339 * The data buffer size is chosen based on the tape's
342 /* Pointer to the request which is waiting in the device request queue */
343 struct request
*active_data_request
;
344 /* Data buffer size (chosen based on the tape's recommendation */
346 idetape_stage_t
*merge_stage
;
347 int merge_stage_size
;
348 struct idetape_bh
*bh
;
353 * Pipeline parameters.
355 * To accomplish non-pipelined mode, we simply set the following
356 * variables to zero (or NULL, where appropriate).
358 /* Number of currently used stages */
360 /* Number of pending stages */
361 int nr_pending_stages
;
362 /* We will not allocate more than this number of stages */
363 int max_stages
, min_pipeline
, max_pipeline
;
364 /* The first stage which will be removed from the pipeline */
365 idetape_stage_t
*first_stage
;
366 /* The currently active stage */
367 idetape_stage_t
*active_stage
;
368 /* Will be serviced after the currently active request */
369 idetape_stage_t
*next_stage
;
370 /* New requests will be added to the pipeline here */
371 idetape_stage_t
*last_stage
;
372 /* Optional free stage which we can use */
373 idetape_stage_t
*cache_stage
;
375 /* Wasted space in each stage */
378 /* Status/Action flags: long for set_bit */
380 /* protects the ide-tape queue */
384 * Measures average tape speed
386 unsigned long avg_time
;
392 char firmware_revision
[6];
393 int firmware_revision_num
;
395 /* the door is currently locked */
397 /* the tape hardware is write protected */
399 /* the tape is write protected (hardware or opened as read-only) */
403 * Limit the number of times a request can
404 * be postponed, to avoid an infinite postpone
407 /* request postpone count limit */
411 * Measures number of frames:
413 * 1. written/read to/from the driver pipeline (pipeline_head).
414 * 2. written/read to/from the tape buffers (idetape_bh).
415 * 3. written/read by the tape to/from the media (tape_head).
423 * Speed control at the tape buffers input/output
425 unsigned long insert_time
;
428 int max_insert_speed
;
429 int measure_insert_time
;
432 * Measure tape still time, in milliseconds
434 unsigned long tape_still_time_begin
;
438 * Speed regulation negative feedback loop
441 int pipeline_head_speed
;
442 int controlled_pipeline_head_speed
;
443 int uncontrolled_pipeline_head_speed
;
444 int controlled_last_pipeline_head
;
445 int uncontrolled_last_pipeline_head
;
446 unsigned long uncontrolled_pipeline_head_time
;
447 unsigned long controlled_pipeline_head_time
;
448 int controlled_previous_pipeline_head
;
449 int uncontrolled_previous_pipeline_head
;
450 unsigned long controlled_previous_head_time
;
451 unsigned long uncontrolled_previous_head_time
;
452 int restart_speed_control_req
;
455 * Debug_level determines amount of debugging output;
456 * can be changed using /proc/ide/hdx/settings
457 * 0 : almost no debugging output
458 * 1 : 0+output errors only
459 * 2 : 1+output all sensekey/asc
460 * 3 : 2+follow all chrdev related procedures
461 * 4 : 3+follow all procedures
462 * 5 : 4+include pc_stack rq_stack info
463 * 6 : 5+USE_COUNT updates
468 static DEFINE_MUTEX(idetape_ref_mutex
);
470 static struct class *idetape_sysfs_class
;
472 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
474 #define ide_tape_g(disk) \
475 container_of((disk)->private_data, struct ide_tape_obj, driver)
477 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
479 struct ide_tape_obj
*tape
= NULL
;
481 mutex_lock(&idetape_ref_mutex
);
482 tape
= ide_tape_g(disk
);
484 kref_get(&tape
->kref
);
485 mutex_unlock(&idetape_ref_mutex
);
489 static void ide_tape_release(struct kref
*);
491 static void ide_tape_put(struct ide_tape_obj
*tape
)
493 mutex_lock(&idetape_ref_mutex
);
494 kref_put(&tape
->kref
, ide_tape_release
);
495 mutex_unlock(&idetape_ref_mutex
);
501 #define DOOR_UNLOCKED 0
502 #define DOOR_LOCKED 1
503 #define DOOR_EXPLICITLY_LOCKED 2
506 * Tape flag bits values.
508 #define IDETAPE_IGNORE_DSC 0
509 #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
510 #define IDETAPE_BUSY 2 /* Device already opened */
511 #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
512 #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
513 #define IDETAPE_FILEMARK 5 /* Currently on a filemark */
514 #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
515 #define IDETAPE_READ_ERROR 7
516 #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
517 /* 0 = no tape is loaded, so we don't rewind after ejecting */
518 #define IDETAPE_MEDIUM_PRESENT 9
521 * Some defines for the READ BUFFER command
523 #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
526 * Some defines for the SPACE command
528 #define IDETAPE_SPACE_OVER_FILEMARK 1
529 #define IDETAPE_SPACE_TO_EOD 3
532 * Some defines for the LOAD UNLOAD command
534 #define IDETAPE_LU_LOAD_MASK 1
535 #define IDETAPE_LU_RETENSION_MASK 2
536 #define IDETAPE_LU_EOT_MASK 4
539 * Special requests for our block device strategy routine.
541 * In order to service a character device command, we add special
542 * requests to the tail of our block device request queue and wait
543 * for their completion.
547 REQ_IDETAPE_PC1
= (1 << 0), /* packet command (first stage) */
548 REQ_IDETAPE_PC2
= (1 << 1), /* packet command (second stage) */
549 REQ_IDETAPE_READ
= (1 << 2),
550 REQ_IDETAPE_WRITE
= (1 << 3),
551 REQ_IDETAPE_READ_BUFFER
= (1 << 4),
555 * Error codes which are returned in rq->errors to the higher part
558 #define IDETAPE_ERROR_GENERAL 101
559 #define IDETAPE_ERROR_FILEMARK 102
560 #define IDETAPE_ERROR_EOD 103
563 * The following is used to format the general configuration word of
564 * the ATAPI IDENTIFY DEVICE command.
566 struct idetape_id_gcw
{
567 unsigned packet_size
:2; /* Packet Size */
568 unsigned reserved234
:3; /* Reserved */
569 unsigned drq_type
:2; /* Command packet DRQ type */
570 unsigned removable
:1; /* Removable media */
571 unsigned device_type
:5; /* Device type */
572 unsigned reserved13
:1; /* Reserved */
573 unsigned protocol
:2; /* Protocol type */
577 * READ POSITION packet command - Data Format (From Table 6-57)
580 unsigned reserved0_10
:2; /* Reserved */
581 unsigned bpu
:1; /* Block Position Unknown */
582 unsigned reserved0_543
:3; /* Reserved */
583 unsigned eop
:1; /* End Of Partition */
584 unsigned bop
:1; /* Beginning Of Partition */
585 u8 partition
; /* Partition Number */
586 u8 reserved2
, reserved3
; /* Reserved */
587 u32 first_block
; /* First Block Location */
588 u32 last_block
; /* Last Block Location (Optional) */
589 u8 reserved12
; /* Reserved */
590 u8 blocks_in_buffer
[3]; /* Blocks In Buffer - (Optional) */
591 u32 bytes_in_buffer
; /* Bytes In Buffer (Optional) */
592 } idetape_read_position_result_t
;
594 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
595 #define IDETAPE_BLOCK_DESCRIPTOR 0
596 #define IDETAPE_CAPABILITIES_PAGE 0x2a
599 * Run time configurable parameters.
602 int dsc_rw_frequency
;
603 int dsc_media_access_frequency
;
608 * The variables below are used for the character device interface.
609 * Additional state variables are defined in our ide_drive_t structure.
611 static struct ide_tape_obj
* idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
613 #define ide_tape_f(file) ((file)->private_data)
615 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
617 struct ide_tape_obj
*tape
= NULL
;
619 mutex_lock(&idetape_ref_mutex
);
620 tape
= idetape_devs
[i
];
622 kref_get(&tape
->kref
);
623 mutex_unlock(&idetape_ref_mutex
);
628 * Function declarations
631 static int idetape_chrdev_release (struct inode
*inode
, struct file
*filp
);
632 static void idetape_write_release (ide_drive_t
*drive
, unsigned int minor
);
635 * Too bad. The drive wants to send us data which we are not ready to accept.
636 * Just throw it away.
638 static void idetape_discard_data (ide_drive_t
*drive
, unsigned int bcount
)
641 (void) HWIF(drive
)->INB(IDE_DATA_REG
);
644 static void idetape_input_buffers (ide_drive_t
*drive
, idetape_pc_t
*pc
, unsigned int bcount
)
646 struct idetape_bh
*bh
= pc
->bh
;
651 printk(KERN_ERR
"ide-tape: bh == NULL in "
652 "idetape_input_buffers\n");
653 idetape_discard_data(drive
, bcount
);
656 count
= min((unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)), bcount
);
657 HWIF(drive
)->atapi_input_bytes(drive
, bh
->b_data
+ atomic_read(&bh
->b_count
), count
);
659 atomic_add(count
, &bh
->b_count
);
660 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
663 atomic_set(&bh
->b_count
, 0);
669 static void idetape_output_buffers (ide_drive_t
*drive
, idetape_pc_t
*pc
, unsigned int bcount
)
671 struct idetape_bh
*bh
= pc
->bh
;
676 printk(KERN_ERR
"ide-tape: bh == NULL in "
677 "idetape_output_buffers\n");
680 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
681 HWIF(drive
)->atapi_output_bytes(drive
, pc
->b_data
, count
);
684 pc
->b_count
-= count
;
686 pc
->bh
= bh
= bh
->b_reqnext
;
688 pc
->b_data
= bh
->b_data
;
689 pc
->b_count
= atomic_read(&bh
->b_count
);
695 static void idetape_update_buffers (idetape_pc_t
*pc
)
697 struct idetape_bh
*bh
= pc
->bh
;
699 unsigned int bcount
= pc
->actually_transferred
;
701 if (test_bit(PC_WRITING
, &pc
->flags
))
705 printk(KERN_ERR
"ide-tape: bh == NULL in "
706 "idetape_update_buffers\n");
709 count
= min((unsigned int)bh
->b_size
, (unsigned int)bcount
);
710 atomic_set(&bh
->b_count
, count
);
711 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
719 * idetape_next_pc_storage returns a pointer to a place in which we can
720 * safely store a packet command, even though we intend to leave the
721 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
722 * commands is allocated at initialization time.
724 static idetape_pc_t
*idetape_next_pc_storage (ide_drive_t
*drive
)
726 idetape_tape_t
*tape
= drive
->driver_data
;
728 #if IDETAPE_DEBUG_LOG
729 if (tape
->debug_level
>= 5)
730 printk(KERN_INFO
"ide-tape: pc_stack_index=%d\n",
731 tape
->pc_stack_index
);
732 #endif /* IDETAPE_DEBUG_LOG */
733 if (tape
->pc_stack_index
== IDETAPE_PC_STACK
)
734 tape
->pc_stack_index
=0;
735 return (&tape
->pc_stack
[tape
->pc_stack_index
++]);
739 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
740 * Since we queue packet commands in the request queue, we need to
741 * allocate a request, along with the allocation of a packet command.
744 /**************************************************************
746 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
747 * followed later on by kfree(). -ml *
749 **************************************************************/
751 static struct request
*idetape_next_rq_storage (ide_drive_t
*drive
)
753 idetape_tape_t
*tape
= drive
->driver_data
;
755 #if IDETAPE_DEBUG_LOG
756 if (tape
->debug_level
>= 5)
757 printk(KERN_INFO
"ide-tape: rq_stack_index=%d\n",
758 tape
->rq_stack_index
);
759 #endif /* IDETAPE_DEBUG_LOG */
760 if (tape
->rq_stack_index
== IDETAPE_PC_STACK
)
761 tape
->rq_stack_index
=0;
762 return (&tape
->rq_stack
[tape
->rq_stack_index
++]);
766 * idetape_init_pc initializes a packet command.
768 static void idetape_init_pc (idetape_pc_t
*pc
)
770 memset(pc
->c
, 0, 12);
773 pc
->request_transfer
= 0;
774 pc
->buffer
= pc
->pc_buffer
;
775 pc
->buffer_size
= IDETAPE_PC_BUFFER_SIZE
;
781 * called on each failed packet command retry to analyze the request sense. We
782 * currently do not utilize this information.
784 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
786 idetape_tape_t
*tape
= drive
->driver_data
;
787 idetape_pc_t
*pc
= tape
->failed_pc
;
789 tape
->sense_key
= sense
[2] & 0xF;
790 tape
->asc
= sense
[12];
791 tape
->ascq
= sense
[13];
792 #if IDETAPE_DEBUG_LOG
794 * Without debugging, we only log an error if we decided to give up
797 if (tape
->debug_level
>= 1)
798 printk(KERN_INFO
"ide-tape: pc = %x, sense key = %x, "
799 "asc = %x, ascq = %x\n",
800 pc
->c
[0], tape
->sense_key
,
801 tape
->asc
, tape
->ascq
);
802 #endif /* IDETAPE_DEBUG_LOG */
804 /* Correct pc->actually_transferred by asking the tape. */
805 if (test_bit(PC_DMA_ERROR
, &pc
->flags
)) {
806 pc
->actually_transferred
= pc
->request_transfer
-
807 tape
->tape_block_size
*
808 be32_to_cpu(get_unaligned((u32
*)&sense
[3]));
809 idetape_update_buffers(pc
);
813 * If error was the result of a zero-length read or write command,
814 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
815 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
817 if ((pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
)
819 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
820 if (tape
->sense_key
== 5) {
821 /* don't report an error, everything's ok */
823 /* don't retry read/write */
824 set_bit(PC_ABORT
, &pc
->flags
);
827 if (pc
->c
[0] == READ_6
&& (sense
[2] & 0x80)) {
828 pc
->error
= IDETAPE_ERROR_FILEMARK
;
829 set_bit(PC_ABORT
, &pc
->flags
);
831 if (pc
->c
[0] == WRITE_6
) {
832 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
833 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
834 pc
->error
= IDETAPE_ERROR_EOD
;
835 set_bit(PC_ABORT
, &pc
->flags
);
838 if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
839 if (tape
->sense_key
== 8) {
840 pc
->error
= IDETAPE_ERROR_EOD
;
841 set_bit(PC_ABORT
, &pc
->flags
);
843 if (!test_bit(PC_ABORT
, &pc
->flags
) &&
844 pc
->actually_transferred
)
845 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
850 * idetape_active_next_stage will declare the next stage as "active".
852 static void idetape_active_next_stage (ide_drive_t
*drive
)
854 idetape_tape_t
*tape
= drive
->driver_data
;
855 idetape_stage_t
*stage
= tape
->next_stage
;
856 struct request
*rq
= &stage
->rq
;
858 #if IDETAPE_DEBUG_LOG
859 if (tape
->debug_level
>= 4)
860 printk(KERN_INFO
"ide-tape: Reached idetape_active_next_stage\n");
861 #endif /* IDETAPE_DEBUG_LOG */
863 printk(KERN_ERR
"ide-tape: bug: Trying to activate a non existing stage\n");
867 rq
->rq_disk
= tape
->disk
;
869 rq
->special
= (void *)stage
->bh
;
870 tape
->active_data_request
= rq
;
871 tape
->active_stage
= stage
;
872 tape
->next_stage
= stage
->next
;
876 * idetape_increase_max_pipeline_stages is a part of the feedback
877 * loop which tries to find the optimum number of stages. In the
878 * feedback loop, we are starting from a minimum maximum number of
879 * stages, and if we sense that the pipeline is empty, we try to
880 * increase it, until we reach the user compile time memory limit.
882 static void idetape_increase_max_pipeline_stages (ide_drive_t
*drive
)
884 idetape_tape_t
*tape
= drive
->driver_data
;
885 int increase
= (tape
->max_pipeline
- tape
->min_pipeline
) / 10;
887 #if IDETAPE_DEBUG_LOG
888 if (tape
->debug_level
>= 4)
889 printk (KERN_INFO
"ide-tape: Reached idetape_increase_max_pipeline_stages\n");
890 #endif /* IDETAPE_DEBUG_LOG */
892 tape
->max_stages
+= max(increase
, 1);
893 tape
->max_stages
= max(tape
->max_stages
, tape
->min_pipeline
);
894 tape
->max_stages
= min(tape
->max_stages
, tape
->max_pipeline
);
898 * idetape_kfree_stage calls kfree to completely free a stage, along with
899 * its related buffers.
901 static void __idetape_kfree_stage (idetape_stage_t
*stage
)
903 struct idetape_bh
*prev_bh
, *bh
= stage
->bh
;
907 if (bh
->b_data
!= NULL
) {
908 size
= (int) bh
->b_size
;
910 free_page((unsigned long) bh
->b_data
);
912 bh
->b_data
+= PAGE_SIZE
;
922 static void idetape_kfree_stage (idetape_tape_t
*tape
, idetape_stage_t
*stage
)
924 __idetape_kfree_stage(stage
);
928 * idetape_remove_stage_head removes tape->first_stage from the pipeline.
929 * The caller should avoid race conditions.
931 static void idetape_remove_stage_head (ide_drive_t
*drive
)
933 idetape_tape_t
*tape
= drive
->driver_data
;
934 idetape_stage_t
*stage
;
936 #if IDETAPE_DEBUG_LOG
937 if (tape
->debug_level
>= 4)
938 printk(KERN_INFO
"ide-tape: Reached idetape_remove_stage_head\n");
939 #endif /* IDETAPE_DEBUG_LOG */
940 if (tape
->first_stage
== NULL
) {
941 printk(KERN_ERR
"ide-tape: bug: tape->first_stage is NULL\n");
944 if (tape
->active_stage
== tape
->first_stage
) {
945 printk(KERN_ERR
"ide-tape: bug: Trying to free our active pipeline stage\n");
948 stage
= tape
->first_stage
;
949 tape
->first_stage
= stage
->next
;
950 idetape_kfree_stage(tape
, stage
);
952 if (tape
->first_stage
== NULL
) {
953 tape
->last_stage
= NULL
;
954 if (tape
->next_stage
!= NULL
)
955 printk(KERN_ERR
"ide-tape: bug: tape->next_stage != NULL\n");
957 printk(KERN_ERR
"ide-tape: bug: nr_stages should be 0 now\n");
962 * This will free all the pipeline stages starting from new_last_stage->next
963 * to the end of the list, and point tape->last_stage to new_last_stage.
965 static void idetape_abort_pipeline(ide_drive_t
*drive
,
966 idetape_stage_t
*new_last_stage
)
968 idetape_tape_t
*tape
= drive
->driver_data
;
969 idetape_stage_t
*stage
= new_last_stage
->next
;
970 idetape_stage_t
*nstage
;
972 #if IDETAPE_DEBUG_LOG
973 if (tape
->debug_level
>= 4)
974 printk(KERN_INFO
"ide-tape: %s: idetape_abort_pipeline called\n", tape
->name
);
977 nstage
= stage
->next
;
978 idetape_kfree_stage(tape
, stage
);
980 --tape
->nr_pending_stages
;
984 new_last_stage
->next
= NULL
;
985 tape
->last_stage
= new_last_stage
;
986 tape
->next_stage
= NULL
;
990 * idetape_end_request is used to finish servicing a request, and to
991 * insert a pending pipeline request into the main device queue.
993 static int idetape_end_request(ide_drive_t
*drive
, int uptodate
, int nr_sects
)
995 struct request
*rq
= HWGROUP(drive
)->rq
;
996 idetape_tape_t
*tape
= drive
->driver_data
;
999 int remove_stage
= 0;
1000 idetape_stage_t
*active_stage
;
1002 #if IDETAPE_DEBUG_LOG
1003 if (tape
->debug_level
>= 4)
1004 printk(KERN_INFO
"ide-tape: Reached idetape_end_request\n");
1005 #endif /* IDETAPE_DEBUG_LOG */
1008 case 0: error
= IDETAPE_ERROR_GENERAL
; break;
1009 case 1: error
= 0; break;
1010 default: error
= uptodate
;
1014 tape
->failed_pc
= NULL
;
1016 if (!blk_special_request(rq
)) {
1017 ide_end_request(drive
, uptodate
, nr_sects
);
1021 spin_lock_irqsave(&tape
->spinlock
, flags
);
1023 /* The request was a pipelined data transfer request */
1024 if (tape
->active_data_request
== rq
) {
1025 active_stage
= tape
->active_stage
;
1026 tape
->active_stage
= NULL
;
1027 tape
->active_data_request
= NULL
;
1028 tape
->nr_pending_stages
--;
1029 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1032 set_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
1033 if (error
== IDETAPE_ERROR_EOD
)
1034 idetape_abort_pipeline(drive
, active_stage
);
1036 } else if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1037 if (error
== IDETAPE_ERROR_EOD
) {
1038 set_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
1039 idetape_abort_pipeline(drive
, active_stage
);
1042 if (tape
->next_stage
!= NULL
) {
1043 idetape_active_next_stage(drive
);
1046 * Insert the next request into the request queue.
1048 (void) ide_do_drive_cmd(drive
, tape
->active_data_request
, ide_end
);
1049 } else if (!error
) {
1050 idetape_increase_max_pipeline_stages(drive
);
1053 ide_end_drive_cmd(drive
, 0, 0);
1054 // blkdev_dequeue_request(rq);
1055 // drive->rq = NULL;
1056 // end_that_request_last(rq);
1059 idetape_remove_stage_head(drive
);
1060 if (tape
->active_data_request
== NULL
)
1061 clear_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
1062 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
1066 static ide_startstop_t
idetape_request_sense_callback (ide_drive_t
*drive
)
1068 idetape_tape_t
*tape
= drive
->driver_data
;
1070 #if IDETAPE_DEBUG_LOG
1071 if (tape
->debug_level
>= 4)
1072 printk(KERN_INFO
"ide-tape: Reached idetape_request_sense_callback\n");
1073 #endif /* IDETAPE_DEBUG_LOG */
1074 if (!tape
->pc
->error
) {
1075 idetape_analyze_error(drive
, tape
->pc
->buffer
);
1076 idetape_end_request(drive
, 1, 0);
1078 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
1079 idetape_end_request(drive
, 0, 0);
1084 static void idetape_create_request_sense_cmd (idetape_pc_t
*pc
)
1086 idetape_init_pc(pc
);
1087 pc
->c
[0] = REQUEST_SENSE
;
1089 pc
->request_transfer
= 20;
1090 pc
->callback
= &idetape_request_sense_callback
;
1093 static void idetape_init_rq(struct request
*rq
, u8 cmd
)
1095 memset(rq
, 0, sizeof(*rq
));
1096 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1101 * idetape_queue_pc_head generates a new packet command request in front
1102 * of the request queue, before the current request, so that it will be
1103 * processed immediately, on the next pass through the driver.
1105 * idetape_queue_pc_head is called from the request handling part of
1106 * the driver (the "bottom" part). Safe storage for the request should
1107 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
1108 * before calling idetape_queue_pc_head.
1110 * Memory for those requests is pre-allocated at initialization time, and
1111 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
1112 * space for the maximum possible number of inter-dependent packet commands.
1114 * The higher level of the driver - The ioctl handler and the character
1115 * device handling functions should queue request to the lower level part
1116 * and wait for their completion using idetape_queue_pc_tail or
1117 * idetape_queue_rw_tail.
1119 static void idetape_queue_pc_head (ide_drive_t
*drive
, idetape_pc_t
*pc
,struct request
*rq
)
1121 struct ide_tape_obj
*tape
= drive
->driver_data
;
1123 idetape_init_rq(rq
, REQ_IDETAPE_PC1
);
1124 rq
->buffer
= (char *) pc
;
1125 rq
->rq_disk
= tape
->disk
;
1126 (void) ide_do_drive_cmd(drive
, rq
, ide_preempt
);
1130 * idetape_retry_pc is called when an error was detected during the
1131 * last packet command. We queue a request sense packet command in
1132 * the head of the request list.
1134 static ide_startstop_t
idetape_retry_pc (ide_drive_t
*drive
)
1136 idetape_tape_t
*tape
= drive
->driver_data
;
1140 (void)drive
->hwif
->INB(IDE_ERROR_REG
);
1141 pc
= idetape_next_pc_storage(drive
);
1142 rq
= idetape_next_rq_storage(drive
);
1143 idetape_create_request_sense_cmd(pc
);
1144 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
1145 idetape_queue_pc_head(drive
, pc
, rq
);
1150 * idetape_postpone_request postpones the current request so that
1151 * ide.c will be able to service requests from another device on
1152 * the same hwgroup while we are polling for DSC.
1154 static void idetape_postpone_request (ide_drive_t
*drive
)
1156 idetape_tape_t
*tape
= drive
->driver_data
;
1158 #if IDETAPE_DEBUG_LOG
1159 if (tape
->debug_level
>= 4)
1160 printk(KERN_INFO
"ide-tape: idetape_postpone_request\n");
1162 tape
->postponed_rq
= HWGROUP(drive
)->rq
;
1163 ide_stall_queue(drive
, tape
->dsc_polling_frequency
);
1167 * idetape_pc_intr is the usual interrupt handler which will be called
1168 * during a packet command. We will transfer some of the data (as
1169 * requested by the drive) and will re-point interrupt handler to us.
1170 * When data transfer is finished, we will act according to the
1171 * algorithm described before idetape_issue_packet_command.
1174 static ide_startstop_t
idetape_pc_intr (ide_drive_t
*drive
)
1176 ide_hwif_t
*hwif
= drive
->hwif
;
1177 idetape_tape_t
*tape
= drive
->driver_data
;
1178 idetape_pc_t
*pc
= tape
->pc
;
1181 static int error_sim_count
= 0;
1186 #if IDETAPE_DEBUG_LOG
1187 if (tape
->debug_level
>= 4)
1188 printk(KERN_INFO
"ide-tape: Reached idetape_pc_intr "
1189 "interrupt handler\n");
1190 #endif /* IDETAPE_DEBUG_LOG */
1192 /* Clear the interrupt */
1193 stat
= hwif
->INB(IDE_STATUS_REG
);
1195 if (test_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
)) {
1196 if (hwif
->ide_dma_end(drive
) || (stat
& ERR_STAT
)) {
1198 * A DMA error is sometimes expected. For example,
1199 * if the tape is crossing a filemark during a
1200 * READ command, it will issue an irq and position
1201 * itself before the filemark, so that only a partial
1202 * data transfer will occur (which causes the DMA
1203 * error). In that case, we will later ask the tape
1204 * how much bytes of the original request were
1205 * actually transferred (we can't receive that
1206 * information from the DMA engine on most chipsets).
1210 * On the contrary, a DMA error is never expected;
1211 * it usually indicates a hardware error or abort.
1212 * If the tape crosses a filemark during a READ
1213 * command, it will issue an irq and position itself
1214 * after the filemark (not before). Only a partial
1215 * data transfer will occur, but no DMA error.
1218 set_bit(PC_DMA_ERROR
, &pc
->flags
);
1220 pc
->actually_transferred
= pc
->request_transfer
;
1221 idetape_update_buffers(pc
);
1223 #if IDETAPE_DEBUG_LOG
1224 if (tape
->debug_level
>= 4)
1225 printk(KERN_INFO
"ide-tape: DMA finished\n");
1226 #endif /* IDETAPE_DEBUG_LOG */
1229 /* No more interrupts */
1230 if ((stat
& DRQ_STAT
) == 0) {
1231 #if IDETAPE_DEBUG_LOG
1232 if (tape
->debug_level
>= 2)
1233 printk(KERN_INFO
"ide-tape: Packet command completed, %d bytes transferred\n", pc
->actually_transferred
);
1234 #endif /* IDETAPE_DEBUG_LOG */
1235 clear_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
);
1240 if ((pc
->c
[0] == WRITE_6
|| pc
->c
[0] == READ_6
) &&
1241 (++error_sim_count
% 100) == 0) {
1242 printk(KERN_INFO
"ide-tape: %s: simulating error\n",
1247 if ((stat
& ERR_STAT
) && pc
->c
[0] == REQUEST_SENSE
)
1249 if ((stat
& ERR_STAT
) || test_bit(PC_DMA_ERROR
, &pc
->flags
)) {
1250 /* Error detected */
1251 #if IDETAPE_DEBUG_LOG
1252 if (tape
->debug_level
>= 1)
1253 printk(KERN_INFO
"ide-tape: %s: I/O error\n",
1255 #endif /* IDETAPE_DEBUG_LOG */
1256 if (pc
->c
[0] == REQUEST_SENSE
) {
1257 printk(KERN_ERR
"ide-tape: I/O error in request sense command\n");
1258 return ide_do_reset(drive
);
1260 #if IDETAPE_DEBUG_LOG
1261 if (tape
->debug_level
>= 1)
1262 printk(KERN_INFO
"ide-tape: [cmd %x]: check condition\n", pc
->c
[0]);
1264 /* Retry operation */
1265 return idetape_retry_pc(drive
);
1268 if (test_bit(PC_WAIT_FOR_DSC
, &pc
->flags
) &&
1269 (stat
& SEEK_STAT
) == 0) {
1270 /* Media access command */
1271 tape
->dsc_polling_start
= jiffies
;
1272 tape
->dsc_polling_frequency
= IDETAPE_DSC_MA_FAST
;
1273 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
1274 /* Allow ide.c to handle other requests */
1275 idetape_postpone_request(drive
);
1278 if (tape
->failed_pc
== pc
)
1279 tape
->failed_pc
= NULL
;
1280 /* Command finished - Call the callback function */
1281 return pc
->callback(drive
);
1283 if (test_and_clear_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
)) {
1284 printk(KERN_ERR
"ide-tape: The tape wants to issue more "
1285 "interrupts in DMA mode\n");
1286 printk(KERN_ERR
"ide-tape: DMA disabled, reverting to PIO\n");
1288 return ide_do_reset(drive
);
1290 /* Get the number of bytes to transfer on this interrupt. */
1291 bcount
= (hwif
->INB(IDE_BCOUNTH_REG
) << 8) |
1292 hwif
->INB(IDE_BCOUNTL_REG
);
1294 ireason
= hwif
->INB(IDE_IREASON_REG
);
1297 printk(KERN_ERR
"ide-tape: CoD != 0 in idetape_pc_intr\n");
1298 return ide_do_reset(drive
);
1300 if (((ireason
& IO
) == IO
) == test_bit(PC_WRITING
, &pc
->flags
)) {
1301 /* Hopefully, we will never get here */
1302 printk(KERN_ERR
"ide-tape: We wanted to %s, ",
1303 (ireason
& IO
) ? "Write" : "Read");
1304 printk(KERN_ERR
"ide-tape: but the tape wants us to %s !\n",
1305 (ireason
& IO
) ? "Read" : "Write");
1306 return ide_do_reset(drive
);
1308 if (!test_bit(PC_WRITING
, &pc
->flags
)) {
1309 /* Reading - Check that we have enough space */
1310 temp
= pc
->actually_transferred
+ bcount
;
1311 if (temp
> pc
->request_transfer
) {
1312 if (temp
> pc
->buffer_size
) {
1313 printk(KERN_ERR
"ide-tape: The tape wants to send us more data than expected - discarding data\n");
1314 idetape_discard_data(drive
, bcount
);
1315 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1318 #if IDETAPE_DEBUG_LOG
1319 if (tape
->debug_level
>= 2)
1320 printk(KERN_NOTICE
"ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
1321 #endif /* IDETAPE_DEBUG_LOG */
1324 if (test_bit(PC_WRITING
, &pc
->flags
)) {
1326 idetape_output_buffers(drive
, pc
, bcount
);
1328 /* Write the current buffer */
1329 hwif
->atapi_output_bytes(drive
, pc
->current_position
,
1333 idetape_input_buffers(drive
, pc
, bcount
);
1335 /* Read the current buffer */
1336 hwif
->atapi_input_bytes(drive
, pc
->current_position
,
1339 /* Update the current position */
1340 pc
->actually_transferred
+= bcount
;
1341 pc
->current_position
+= bcount
;
1342 #if IDETAPE_DEBUG_LOG
1343 if (tape
->debug_level
>= 2)
1344 printk(KERN_INFO
"ide-tape: [cmd %x] transferred %d bytes "
1345 "on that interrupt\n", pc
->c
[0], bcount
);
1347 /* And set the interrupt handler again */
1348 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1353 * Packet Command Interface
1355 * The current Packet Command is available in tape->pc, and will not
1356 * change until we finish handling it. Each packet command is associated
1357 * with a callback function that will be called when the command is
1360 * The handling will be done in three stages:
1362 * 1. idetape_issue_packet_command will send the packet command to the
1363 * drive, and will set the interrupt handler to idetape_pc_intr.
1365 * 2. On each interrupt, idetape_pc_intr will be called. This step
1366 * will be repeated until the device signals us that no more
1367 * interrupts will be issued.
1369 * 3. ATAPI Tape media access commands have immediate status with a
1370 * delayed process. In case of a successful initiation of a
1371 * media access packet command, the DSC bit will be set when the
1372 * actual execution of the command is finished.
1373 * Since the tape drive will not issue an interrupt, we have to
1374 * poll for this event. In this case, we define the request as
1375 * "low priority request" by setting rq_status to
1376 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
1379 * ide.c will then give higher priority to requests which
1380 * originate from the other device, until will change rq_status
1383 * 4. When the packet command is finished, it will be checked for errors.
1385 * 5. In case an error was found, we queue a request sense packet
1386 * command in front of the request queue and retry the operation
1387 * up to IDETAPE_MAX_PC_RETRIES times.
1389 * 6. In case no error was found, or we decided to give up and not
1390 * to retry again, the callback function will be called and then
1391 * we will handle the next request.
1394 static ide_startstop_t
idetape_transfer_pc(ide_drive_t
*drive
)
1396 ide_hwif_t
*hwif
= drive
->hwif
;
1397 idetape_tape_t
*tape
= drive
->driver_data
;
1398 idetape_pc_t
*pc
= tape
->pc
;
1400 ide_startstop_t startstop
;
1403 if (ide_wait_stat(&startstop
,drive
,DRQ_STAT
,BUSY_STAT
,WAIT_READY
)) {
1404 printk(KERN_ERR
"ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
1407 ireason
= hwif
->INB(IDE_IREASON_REG
);
1408 while (retries
-- && ((ireason
& CD
) == 0 || (ireason
& IO
))) {
1409 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while issuing "
1410 "a packet command, retrying\n");
1412 ireason
= hwif
->INB(IDE_IREASON_REG
);
1414 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while "
1415 "issuing a packet command, ignoring\n");
1420 if ((ireason
& CD
) == 0 || (ireason
& IO
)) {
1421 printk(KERN_ERR
"ide-tape: (IO,CoD) != (0,1) while issuing "
1422 "a packet command\n");
1423 return ide_do_reset(drive
);
1425 /* Set the interrupt routine */
1426 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1427 #ifdef CONFIG_BLK_DEV_IDEDMA
1428 /* Begin DMA, if necessary */
1429 if (test_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
))
1430 hwif
->dma_start(drive
);
1432 /* Send the actual packet */
1433 HWIF(drive
)->atapi_output_bytes(drive
, pc
->c
, 12);
1437 static ide_startstop_t
idetape_issue_packet_command (ide_drive_t
*drive
, idetape_pc_t
*pc
)
1439 ide_hwif_t
*hwif
= drive
->hwif
;
1440 idetape_tape_t
*tape
= drive
->driver_data
;
1444 if (tape
->pc
->c
[0] == REQUEST_SENSE
&&
1445 pc
->c
[0] == REQUEST_SENSE
) {
1446 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
1447 "Two request sense in serial were issued\n");
1450 if (tape
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
1451 tape
->failed_pc
= pc
;
1452 /* Set the current packet command */
1455 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
1456 test_bit(PC_ABORT
, &pc
->flags
)) {
1458 * We will "abort" retrying a packet command in case
1459 * a legitimate error code was received (crossing a
1460 * filemark, or end of the media, for example).
1462 if (!test_bit(PC_ABORT
, &pc
->flags
)) {
1463 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
1464 tape
->sense_key
== 2 && tape
->asc
== 4 &&
1465 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
1466 printk(KERN_ERR
"ide-tape: %s: I/O error, "
1467 "pc = %2x, key = %2x, "
1468 "asc = %2x, ascq = %2x\n",
1469 tape
->name
, pc
->c
[0],
1470 tape
->sense_key
, tape
->asc
,
1474 pc
->error
= IDETAPE_ERROR_GENERAL
;
1476 tape
->failed_pc
= NULL
;
1477 return pc
->callback(drive
);
1479 #if IDETAPE_DEBUG_LOG
1480 if (tape
->debug_level
>= 2)
1481 printk(KERN_INFO
"ide-tape: Retry number - %d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
1482 #endif /* IDETAPE_DEBUG_LOG */
1485 /* We haven't transferred any data yet */
1486 pc
->actually_transferred
= 0;
1487 pc
->current_position
= pc
->buffer
;
1488 /* Request to transfer the entire buffer at once */
1489 bcount
= pc
->request_transfer
;
1491 if (test_and_clear_bit(PC_DMA_ERROR
, &pc
->flags
)) {
1492 printk(KERN_WARNING
"ide-tape: DMA disabled, "
1493 "reverting to PIO\n");
1496 if (test_bit(PC_DMA_RECOMMENDED
, &pc
->flags
) && drive
->using_dma
)
1497 dma_ok
= !hwif
->dma_setup(drive
);
1499 ide_pktcmd_tf_load(drive
, IDE_TFLAG_NO_SELECT_MASK
|
1500 IDE_TFLAG_OUT_DEVICE
, bcount
, dma_ok
);
1502 if (dma_ok
) /* Will begin DMA later */
1503 set_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
);
1504 if (test_bit(IDETAPE_DRQ_INTERRUPT
, &tape
->flags
)) {
1505 ide_execute_command(drive
, WIN_PACKETCMD
, &idetape_transfer_pc
,
1506 IDETAPE_WAIT_CMD
, NULL
);
1509 hwif
->OUTB(WIN_PACKETCMD
, IDE_COMMAND_REG
);
1510 return idetape_transfer_pc(drive
);
1515 * General packet command callback function.
1517 static ide_startstop_t
idetape_pc_callback (ide_drive_t
*drive
)
1519 idetape_tape_t
*tape
= drive
->driver_data
;
1521 #if IDETAPE_DEBUG_LOG
1522 if (tape
->debug_level
>= 4)
1523 printk(KERN_INFO
"ide-tape: Reached idetape_pc_callback\n");
1524 #endif /* IDETAPE_DEBUG_LOG */
1526 idetape_end_request(drive
, tape
->pc
->error
? 0 : 1, 0);
1531 * A mode sense command is used to "sense" tape parameters.
1533 static void idetape_create_mode_sense_cmd (idetape_pc_t
*pc
, u8 page_code
)
1535 idetape_init_pc(pc
);
1536 pc
->c
[0] = MODE_SENSE
;
1537 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
1538 pc
->c
[1] = 8; /* DBD = 1 - Don't return block descriptors */
1539 pc
->c
[2] = page_code
;
1541 * Changed pc->c[3] to 0 (255 will at best return unused info).
1543 * For SCSI this byte is defined as subpage instead of high byte
1544 * of length and some IDE drives seem to interpret it this way
1545 * and return an error when 255 is used.
1548 pc
->c
[4] = 255; /* (We will just discard data in that case) */
1549 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
1550 pc
->request_transfer
= 12;
1551 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
1552 pc
->request_transfer
= 24;
1554 pc
->request_transfer
= 50;
1555 pc
->callback
= &idetape_pc_callback
;
1558 static void calculate_speeds(ide_drive_t
*drive
)
1560 idetape_tape_t
*tape
= drive
->driver_data
;
1561 int full
= 125, empty
= 75;
1563 if (time_after(jiffies
, tape
->controlled_pipeline_head_time
+ 120 * HZ
)) {
1564 tape
->controlled_previous_pipeline_head
= tape
->controlled_last_pipeline_head
;
1565 tape
->controlled_previous_head_time
= tape
->controlled_pipeline_head_time
;
1566 tape
->controlled_last_pipeline_head
= tape
->pipeline_head
;
1567 tape
->controlled_pipeline_head_time
= jiffies
;
1569 if (time_after(jiffies
, tape
->controlled_pipeline_head_time
+ 60 * HZ
))
1570 tape
->controlled_pipeline_head_speed
= (tape
->pipeline_head
- tape
->controlled_last_pipeline_head
) * 32 * HZ
/ (jiffies
- tape
->controlled_pipeline_head_time
);
1571 else if (time_after(jiffies
, tape
->controlled_previous_head_time
))
1572 tape
->controlled_pipeline_head_speed
= (tape
->pipeline_head
- tape
->controlled_previous_pipeline_head
) * 32 * HZ
/ (jiffies
- tape
->controlled_previous_head_time
);
1574 if (tape
->nr_pending_stages
< tape
->max_stages
/*- 1 */) {
1575 /* -1 for read mode error recovery */
1576 if (time_after(jiffies
, tape
->uncontrolled_previous_head_time
+ 10 * HZ
)) {
1577 tape
->uncontrolled_pipeline_head_time
= jiffies
;
1578 tape
->uncontrolled_pipeline_head_speed
= (tape
->pipeline_head
- tape
->uncontrolled_previous_pipeline_head
) * 32 * HZ
/ (jiffies
- tape
->uncontrolled_previous_head_time
);
1581 tape
->uncontrolled_previous_head_time
= jiffies
;
1582 tape
->uncontrolled_previous_pipeline_head
= tape
->pipeline_head
;
1583 if (time_after(jiffies
, tape
->uncontrolled_pipeline_head_time
+ 30 * HZ
)) {
1584 tape
->uncontrolled_pipeline_head_time
= jiffies
;
1587 tape
->pipeline_head_speed
= max(tape
->uncontrolled_pipeline_head_speed
, tape
->controlled_pipeline_head_speed
);
1588 if (tape
->speed_control
== 0) {
1589 tape
->max_insert_speed
= 5000;
1590 } else if (tape
->speed_control
== 1) {
1591 if (tape
->nr_pending_stages
>= tape
->max_stages
/ 2)
1592 tape
->max_insert_speed
= tape
->pipeline_head_speed
+
1593 (1100 - tape
->pipeline_head_speed
) * 2 * (tape
->nr_pending_stages
- tape
->max_stages
/ 2) / tape
->max_stages
;
1595 tape
->max_insert_speed
= 500 +
1596 (tape
->pipeline_head_speed
- 500) * 2 * tape
->nr_pending_stages
/ tape
->max_stages
;
1597 if (tape
->nr_pending_stages
>= tape
->max_stages
* 99 / 100)
1598 tape
->max_insert_speed
= 5000;
1599 } else if (tape
->speed_control
== 2) {
1600 tape
->max_insert_speed
= tape
->pipeline_head_speed
* empty
/ 100 +
1601 (tape
->pipeline_head_speed
* full
/ 100 - tape
->pipeline_head_speed
* empty
/ 100) * tape
->nr_pending_stages
/ tape
->max_stages
;
1603 tape
->max_insert_speed
= tape
->speed_control
;
1604 tape
->max_insert_speed
= max(tape
->max_insert_speed
, 500);
1607 static ide_startstop_t
idetape_media_access_finished (ide_drive_t
*drive
)
1609 idetape_tape_t
*tape
= drive
->driver_data
;
1610 idetape_pc_t
*pc
= tape
->pc
;
1613 stat
= drive
->hwif
->INB(IDE_STATUS_REG
);
1614 if (stat
& SEEK_STAT
) {
1615 if (stat
& ERR_STAT
) {
1616 /* Error detected */
1617 if (pc
->c
[0] != TEST_UNIT_READY
)
1618 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
1620 /* Retry operation */
1621 return idetape_retry_pc(drive
);
1624 if (tape
->failed_pc
== pc
)
1625 tape
->failed_pc
= NULL
;
1627 pc
->error
= IDETAPE_ERROR_GENERAL
;
1628 tape
->failed_pc
= NULL
;
1630 return pc
->callback(drive
);
1633 static ide_startstop_t
idetape_rw_callback (ide_drive_t
*drive
)
1635 idetape_tape_t
*tape
= drive
->driver_data
;
1636 struct request
*rq
= HWGROUP(drive
)->rq
;
1637 int blocks
= tape
->pc
->actually_transferred
/ tape
->tape_block_size
;
1639 tape
->avg_size
+= blocks
* tape
->tape_block_size
;
1640 tape
->insert_size
+= blocks
* tape
->tape_block_size
;
1641 if (tape
->insert_size
> 1024 * 1024)
1642 tape
->measure_insert_time
= 1;
1643 if (tape
->measure_insert_time
) {
1644 tape
->measure_insert_time
= 0;
1645 tape
->insert_time
= jiffies
;
1646 tape
->insert_size
= 0;
1648 if (time_after(jiffies
, tape
->insert_time
))
1649 tape
->insert_speed
= tape
->insert_size
/ 1024 * HZ
/ (jiffies
- tape
->insert_time
);
1650 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
1651 tape
->avg_speed
= tape
->avg_size
* HZ
/ (jiffies
- tape
->avg_time
) / 1024;
1653 tape
->avg_time
= jiffies
;
1656 #if IDETAPE_DEBUG_LOG
1657 if (tape
->debug_level
>= 4)
1658 printk(KERN_INFO
"ide-tape: Reached idetape_rw_callback\n");
1659 #endif /* IDETAPE_DEBUG_LOG */
1661 tape
->first_frame_position
+= blocks
;
1662 rq
->current_nr_sectors
-= blocks
;
1664 if (!tape
->pc
->error
)
1665 idetape_end_request(drive
, 1, 0);
1667 idetape_end_request(drive
, tape
->pc
->error
, 0);
1671 static void idetape_create_read_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
, unsigned int length
, struct idetape_bh
*bh
)
1673 idetape_init_pc(pc
);
1675 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1677 pc
->callback
= &idetape_rw_callback
;
1679 atomic_set(&bh
->b_count
, 0);
1681 pc
->request_transfer
= pc
->buffer_size
= length
* tape
->tape_block_size
;
1682 if (pc
->request_transfer
== tape
->stage_size
)
1683 set_bit(PC_DMA_RECOMMENDED
, &pc
->flags
);
1686 static void idetape_create_read_buffer_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
, unsigned int length
, struct idetape_bh
*bh
)
1689 struct idetape_bh
*p
= bh
;
1691 idetape_init_pc(pc
);
1692 pc
->c
[0] = READ_BUFFER
;
1693 pc
->c
[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK
;
1694 pc
->c
[7] = size
>> 8;
1695 pc
->c
[8] = size
& 0xff;
1696 pc
->callback
= &idetape_pc_callback
;
1698 atomic_set(&bh
->b_count
, 0);
1701 atomic_set(&p
->b_count
, 0);
1704 pc
->request_transfer
= pc
->buffer_size
= size
;
1707 static void idetape_create_write_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
, unsigned int length
, struct idetape_bh
*bh
)
1709 idetape_init_pc(pc
);
1711 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1713 pc
->callback
= &idetape_rw_callback
;
1714 set_bit(PC_WRITING
, &pc
->flags
);
1716 pc
->b_data
= bh
->b_data
;
1717 pc
->b_count
= atomic_read(&bh
->b_count
);
1719 pc
->request_transfer
= pc
->buffer_size
= length
* tape
->tape_block_size
;
1720 if (pc
->request_transfer
== tape
->stage_size
)
1721 set_bit(PC_DMA_RECOMMENDED
, &pc
->flags
);
1725 * idetape_do_request is our request handling function.
1727 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
1728 struct request
*rq
, sector_t block
)
1730 idetape_tape_t
*tape
= drive
->driver_data
;
1731 idetape_pc_t
*pc
= NULL
;
1732 struct request
*postponed_rq
= tape
->postponed_rq
;
1735 #if IDETAPE_DEBUG_LOG
1736 if (tape
->debug_level
>= 2)
1737 printk(KERN_INFO
"ide-tape: sector: %ld, "
1738 "nr_sectors: %ld, current_nr_sectors: %d\n",
1739 rq
->sector
, rq
->nr_sectors
, rq
->current_nr_sectors
);
1740 #endif /* IDETAPE_DEBUG_LOG */
1742 if (!blk_special_request(rq
)) {
1744 * We do not support buffer cache originated requests.
1746 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
1747 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
1748 ide_end_request(drive
, 0, 0);
1753 * Retry a failed packet command
1755 if (tape
->failed_pc
!= NULL
&&
1756 tape
->pc
->c
[0] == REQUEST_SENSE
) {
1757 return idetape_issue_packet_command(drive
, tape
->failed_pc
);
1759 if (postponed_rq
!= NULL
)
1760 if (rq
!= postponed_rq
) {
1761 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
1762 "Two DSC requests were queued\n");
1763 idetape_end_request(drive
, 0, 0);
1767 tape
->postponed_rq
= NULL
;
1770 * If the tape is still busy, postpone our request and service
1771 * the other device meanwhile.
1773 stat
= drive
->hwif
->INB(IDE_STATUS_REG
);
1775 if (!drive
->dsc_overlap
&& !(rq
->cmd
[0] & REQ_IDETAPE_PC2
))
1776 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
1778 if (drive
->post_reset
== 1) {
1779 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
1780 drive
->post_reset
= 0;
1783 if (tape
->tape_still_time
> 100 && tape
->tape_still_time
< 200)
1784 tape
->measure_insert_time
= 1;
1785 if (time_after(jiffies
, tape
->insert_time
))
1786 tape
->insert_speed
= tape
->insert_size
/ 1024 * HZ
/ (jiffies
- tape
->insert_time
);
1787 calculate_speeds(drive
);
1788 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
) &&
1789 (stat
& SEEK_STAT
) == 0) {
1790 if (postponed_rq
== NULL
) {
1791 tape
->dsc_polling_start
= jiffies
;
1792 tape
->dsc_polling_frequency
= tape
->best_dsc_rw_frequency
;
1793 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
1794 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
1795 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
1797 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1798 idetape_media_access_finished(drive
);
1801 return ide_do_reset(drive
);
1803 } else if (time_after(jiffies
, tape
->dsc_polling_start
+ IDETAPE_DSC_MA_THRESHOLD
))
1804 tape
->dsc_polling_frequency
= IDETAPE_DSC_MA_SLOW
;
1805 idetape_postpone_request(drive
);
1808 if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1809 tape
->buffer_head
++;
1810 tape
->postpone_cnt
= 0;
1811 pc
= idetape_next_pc_storage(drive
);
1812 idetape_create_read_cmd(tape
, pc
, rq
->current_nr_sectors
, (struct idetape_bh
*)rq
->special
);
1815 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1816 tape
->buffer_head
++;
1817 tape
->postpone_cnt
= 0;
1818 pc
= idetape_next_pc_storage(drive
);
1819 idetape_create_write_cmd(tape
, pc
, rq
->current_nr_sectors
, (struct idetape_bh
*)rq
->special
);
1822 if (rq
->cmd
[0] & REQ_IDETAPE_READ_BUFFER
) {
1823 tape
->postpone_cnt
= 0;
1824 pc
= idetape_next_pc_storage(drive
);
1825 idetape_create_read_buffer_cmd(tape
, pc
, rq
->current_nr_sectors
, (struct idetape_bh
*)rq
->special
);
1828 if (rq
->cmd
[0] & REQ_IDETAPE_PC1
) {
1829 pc
= (idetape_pc_t
*) rq
->buffer
;
1830 rq
->cmd
[0] &= ~(REQ_IDETAPE_PC1
);
1831 rq
->cmd
[0] |= REQ_IDETAPE_PC2
;
1834 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1835 idetape_media_access_finished(drive
);
1840 return idetape_issue_packet_command(drive
, pc
);
1844 * Pipeline related functions
1846 static inline int idetape_pipeline_active (idetape_tape_t
*tape
)
1850 rc1
= test_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
1851 rc2
= (tape
->active_data_request
!= NULL
);
1856 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
1857 * stage, along with all the necessary small buffers which together make
1858 * a buffer of size tape->stage_size (or a bit more). We attempt to
1859 * combine sequential pages as much as possible.
1861 * Returns a pointer to the new allocated stage, or NULL if we
1862 * can't (or don't want to) allocate a stage.
1864 * Pipeline stages are optional and are used to increase performance.
1865 * If we can't allocate them, we'll manage without them.
1867 static idetape_stage_t
*__idetape_kmalloc_stage (idetape_tape_t
*tape
, int full
, int clear
)
1869 idetape_stage_t
*stage
;
1870 struct idetape_bh
*prev_bh
, *bh
;
1871 int pages
= tape
->pages_per_stage
;
1872 char *b_data
= NULL
;
1874 if ((stage
= kmalloc(sizeof (idetape_stage_t
),GFP_KERNEL
)) == NULL
)
1878 bh
= stage
->bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1881 bh
->b_reqnext
= NULL
;
1882 if ((bh
->b_data
= (char *) __get_free_page (GFP_KERNEL
)) == NULL
)
1885 memset(bh
->b_data
, 0, PAGE_SIZE
);
1886 bh
->b_size
= PAGE_SIZE
;
1887 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1890 if ((b_data
= (char *) __get_free_page (GFP_KERNEL
)) == NULL
)
1893 memset(b_data
, 0, PAGE_SIZE
);
1894 if (bh
->b_data
== b_data
+ PAGE_SIZE
) {
1895 bh
->b_size
+= PAGE_SIZE
;
1896 bh
->b_data
-= PAGE_SIZE
;
1898 atomic_add(PAGE_SIZE
, &bh
->b_count
);
1901 if (b_data
== bh
->b_data
+ bh
->b_size
) {
1902 bh
->b_size
+= PAGE_SIZE
;
1904 atomic_add(PAGE_SIZE
, &bh
->b_count
);
1908 if ((bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
)) == NULL
) {
1909 free_page((unsigned long) b_data
);
1912 bh
->b_reqnext
= NULL
;
1913 bh
->b_data
= b_data
;
1914 bh
->b_size
= PAGE_SIZE
;
1915 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1916 prev_bh
->b_reqnext
= bh
;
1918 bh
->b_size
-= tape
->excess_bh_size
;
1920 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
1923 __idetape_kfree_stage(stage
);
1927 static idetape_stage_t
*idetape_kmalloc_stage (idetape_tape_t
*tape
)
1929 idetape_stage_t
*cache_stage
= tape
->cache_stage
;
1931 #if IDETAPE_DEBUG_LOG
1932 if (tape
->debug_level
>= 4)
1933 printk(KERN_INFO
"ide-tape: Reached idetape_kmalloc_stage\n");
1934 #endif /* IDETAPE_DEBUG_LOG */
1936 if (tape
->nr_stages
>= tape
->max_stages
)
1938 if (cache_stage
!= NULL
) {
1939 tape
->cache_stage
= NULL
;
1942 return __idetape_kmalloc_stage(tape
, 0, 0);
1945 static int idetape_copy_stage_from_user (idetape_tape_t
*tape
, idetape_stage_t
*stage
, const char __user
*buf
, int n
)
1947 struct idetape_bh
*bh
= tape
->bh
;
1953 printk(KERN_ERR
"ide-tape: bh == NULL in "
1954 "idetape_copy_stage_from_user\n");
1957 count
= min((unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)), (unsigned int)n
);
1958 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
, count
))
1961 atomic_add(count
, &bh
->b_count
);
1963 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
1966 atomic_set(&bh
->b_count
, 0);
1973 static int idetape_copy_stage_to_user (idetape_tape_t
*tape
, char __user
*buf
, idetape_stage_t
*stage
, int n
)
1975 struct idetape_bh
*bh
= tape
->bh
;
1981 printk(KERN_ERR
"ide-tape: bh == NULL in "
1982 "idetape_copy_stage_to_user\n");
1985 count
= min(tape
->b_count
, n
);
1986 if (copy_to_user(buf
, tape
->b_data
, count
))
1989 tape
->b_data
+= count
;
1990 tape
->b_count
-= count
;
1992 if (!tape
->b_count
) {
1993 tape
->bh
= bh
= bh
->b_reqnext
;
1995 tape
->b_data
= bh
->b_data
;
1996 tape
->b_count
= atomic_read(&bh
->b_count
);
2003 static void idetape_init_merge_stage (idetape_tape_t
*tape
)
2005 struct idetape_bh
*bh
= tape
->merge_stage
->bh
;
2008 if (tape
->chrdev_direction
== idetape_direction_write
)
2009 atomic_set(&bh
->b_count
, 0);
2011 tape
->b_data
= bh
->b_data
;
2012 tape
->b_count
= atomic_read(&bh
->b_count
);
2016 static void idetape_switch_buffers (idetape_tape_t
*tape
, idetape_stage_t
*stage
)
2018 struct idetape_bh
*tmp
;
2021 stage
->bh
= tape
->merge_stage
->bh
;
2022 tape
->merge_stage
->bh
= tmp
;
2023 idetape_init_merge_stage(tape
);
2027 * idetape_add_stage_tail adds a new stage at the end of the pipeline.
2029 static void idetape_add_stage_tail (ide_drive_t
*drive
,idetape_stage_t
*stage
)
2031 idetape_tape_t
*tape
= drive
->driver_data
;
2032 unsigned long flags
;
2034 #if IDETAPE_DEBUG_LOG
2035 if (tape
->debug_level
>= 4)
2036 printk (KERN_INFO
"ide-tape: Reached idetape_add_stage_tail\n");
2037 #endif /* IDETAPE_DEBUG_LOG */
2038 spin_lock_irqsave(&tape
->spinlock
, flags
);
2040 if (tape
->last_stage
!= NULL
)
2041 tape
->last_stage
->next
=stage
;
2043 tape
->first_stage
= tape
->next_stage
=stage
;
2044 tape
->last_stage
= stage
;
2045 if (tape
->next_stage
== NULL
)
2046 tape
->next_stage
= tape
->last_stage
;
2048 tape
->nr_pending_stages
++;
2049 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2053 * idetape_wait_for_request installs a completion in a pending request
2054 * and sleeps until it is serviced.
2056 * The caller should ensure that the request will not be serviced
2057 * before we install the completion (usually by disabling interrupts).
2059 static void idetape_wait_for_request (ide_drive_t
*drive
, struct request
*rq
)
2061 DECLARE_COMPLETION_ONSTACK(wait
);
2062 idetape_tape_t
*tape
= drive
->driver_data
;
2064 if (rq
== NULL
|| !blk_special_request(rq
)) {
2065 printk (KERN_ERR
"ide-tape: bug: Trying to sleep on non-valid request\n");
2068 rq
->end_io_data
= &wait
;
2069 rq
->end_io
= blk_end_sync_rq
;
2070 spin_unlock_irq(&tape
->spinlock
);
2071 wait_for_completion(&wait
);
2072 /* The stage and its struct request have been deallocated */
2073 spin_lock_irq(&tape
->spinlock
);
2076 static ide_startstop_t
idetape_read_position_callback (ide_drive_t
*drive
)
2078 idetape_tape_t
*tape
= drive
->driver_data
;
2079 idetape_read_position_result_t
*result
;
2081 #if IDETAPE_DEBUG_LOG
2082 if (tape
->debug_level
>= 4)
2083 printk(KERN_INFO
"ide-tape: Reached idetape_read_position_callback\n");
2084 #endif /* IDETAPE_DEBUG_LOG */
2086 if (!tape
->pc
->error
) {
2087 result
= (idetape_read_position_result_t
*) tape
->pc
->buffer
;
2088 #if IDETAPE_DEBUG_LOG
2089 if (tape
->debug_level
>= 2)
2090 printk(KERN_INFO
"ide-tape: BOP - %s\n",result
->bop
? "Yes":"No");
2091 if (tape
->debug_level
>= 2)
2092 printk(KERN_INFO
"ide-tape: EOP - %s\n",result
->eop
? "Yes":"No");
2093 #endif /* IDETAPE_DEBUG_LOG */
2095 printk(KERN_INFO
"ide-tape: Block location is unknown to the tape\n");
2096 clear_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
);
2097 idetape_end_request(drive
, 0, 0);
2099 #if IDETAPE_DEBUG_LOG
2100 if (tape
->debug_level
>= 2)
2101 printk(KERN_INFO
"ide-tape: Block Location - %u\n", ntohl(result
->first_block
));
2102 #endif /* IDETAPE_DEBUG_LOG */
2103 tape
->partition
= result
->partition
;
2104 tape
->first_frame_position
= ntohl(result
->first_block
);
2105 tape
->last_frame_position
= ntohl(result
->last_block
);
2106 tape
->blocks_in_buffer
= result
->blocks_in_buffer
[2];
2107 set_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
);
2108 idetape_end_request(drive
, 1, 0);
2111 idetape_end_request(drive
, 0, 0);
2117 * idetape_create_write_filemark_cmd will:
2119 * 1. Write a filemark if write_filemark=1.
2120 * 2. Flush the device buffers without writing a filemark
2121 * if write_filemark=0.
2124 static void idetape_create_write_filemark_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
,int write_filemark
)
2126 idetape_init_pc(pc
);
2127 pc
->c
[0] = WRITE_FILEMARKS
;
2128 pc
->c
[4] = write_filemark
;
2129 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2130 pc
->callback
= &idetape_pc_callback
;
2133 static void idetape_create_test_unit_ready_cmd(idetape_pc_t
*pc
)
2135 idetape_init_pc(pc
);
2136 pc
->c
[0] = TEST_UNIT_READY
;
2137 pc
->callback
= &idetape_pc_callback
;
2141 * idetape_queue_pc_tail is based on the following functions:
2143 * ide_do_drive_cmd from ide.c
2144 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
2146 * We add a special packet command request to the tail of the request
2147 * queue, and wait for it to be serviced.
2149 * This is not to be called from within the request handling part
2150 * of the driver ! We allocate here data in the stack, and it is valid
2151 * until the request is finished. This is not the case for the bottom
2152 * part of the driver, where we are always leaving the functions to wait
2153 * for an interrupt or a timer event.
2155 * From the bottom part of the driver, we should allocate safe memory
2156 * using idetape_next_pc_storage and idetape_next_rq_storage, and add
2157 * the request to the request list without waiting for it to be serviced !
2158 * In that case, we usually use idetape_queue_pc_head.
2160 static int __idetape_queue_pc_tail (ide_drive_t
*drive
, idetape_pc_t
*pc
)
2162 struct ide_tape_obj
*tape
= drive
->driver_data
;
2165 idetape_init_rq(&rq
, REQ_IDETAPE_PC1
);
2166 rq
.buffer
= (char *) pc
;
2167 rq
.rq_disk
= tape
->disk
;
2168 return ide_do_drive_cmd(drive
, &rq
, ide_wait
);
2171 static void idetape_create_load_unload_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
,int cmd
)
2173 idetape_init_pc(pc
);
2174 pc
->c
[0] = START_STOP
;
2176 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2177 pc
->callback
= &idetape_pc_callback
;
2180 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
2182 idetape_tape_t
*tape
= drive
->driver_data
;
2184 int load_attempted
= 0;
2187 * Wait for the tape to become ready
2189 set_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
);
2191 while (time_before(jiffies
, timeout
)) {
2192 idetape_create_test_unit_ready_cmd(&pc
);
2193 if (!__idetape_queue_pc_tail(drive
, &pc
))
2195 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
2196 || (tape
->asc
== 0x3A)) { /* no media */
2199 idetape_create_load_unload_cmd(drive
, &pc
, IDETAPE_LU_LOAD_MASK
);
2200 __idetape_queue_pc_tail(drive
, &pc
);
2202 /* not about to be ready */
2203 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
2204 (tape
->ascq
== 1 || tape
->ascq
== 8)))
2211 static int idetape_queue_pc_tail (ide_drive_t
*drive
,idetape_pc_t
*pc
)
2213 return __idetape_queue_pc_tail(drive
, pc
);
2216 static int idetape_flush_tape_buffers (ide_drive_t
*drive
)
2221 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
2222 if ((rc
= idetape_queue_pc_tail(drive
, &pc
)))
2224 idetape_wait_ready(drive
, 60 * 5 * HZ
);
2228 static void idetape_create_read_position_cmd (idetape_pc_t
*pc
)
2230 idetape_init_pc(pc
);
2231 pc
->c
[0] = READ_POSITION
;
2232 pc
->request_transfer
= 20;
2233 pc
->callback
= &idetape_read_position_callback
;
2236 static int idetape_read_position (ide_drive_t
*drive
)
2238 idetape_tape_t
*tape
= drive
->driver_data
;
2242 #if IDETAPE_DEBUG_LOG
2243 if (tape
->debug_level
>= 4)
2244 printk(KERN_INFO
"ide-tape: Reached idetape_read_position\n");
2245 #endif /* IDETAPE_DEBUG_LOG */
2247 idetape_create_read_position_cmd(&pc
);
2248 if (idetape_queue_pc_tail(drive
, &pc
))
2250 position
= tape
->first_frame_position
;
2254 static void idetape_create_locate_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
, unsigned int block
, u8 partition
, int skip
)
2256 idetape_init_pc(pc
);
2257 pc
->c
[0] = POSITION_TO_ELEMENT
;
2259 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
2260 pc
->c
[8] = partition
;
2261 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2262 pc
->callback
= &idetape_pc_callback
;
2265 static int idetape_create_prevent_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
, int prevent
)
2267 idetape_tape_t
*tape
= drive
->driver_data
;
2269 /* device supports locking according to capabilities page */
2270 if (!(tape
->caps
[6] & 0x01))
2273 idetape_init_pc(pc
);
2274 pc
->c
[0] = ALLOW_MEDIUM_REMOVAL
;
2276 pc
->callback
= &idetape_pc_callback
;
2280 static int __idetape_discard_read_pipeline (ide_drive_t
*drive
)
2282 idetape_tape_t
*tape
= drive
->driver_data
;
2283 unsigned long flags
;
2286 if (tape
->chrdev_direction
!= idetape_direction_read
)
2289 /* Remove merge stage. */
2290 cnt
= tape
->merge_stage_size
/ tape
->tape_block_size
;
2291 if (test_and_clear_bit(IDETAPE_FILEMARK
, &tape
->flags
))
2292 ++cnt
; /* Filemarks count as 1 sector */
2293 tape
->merge_stage_size
= 0;
2294 if (tape
->merge_stage
!= NULL
) {
2295 __idetape_kfree_stage(tape
->merge_stage
);
2296 tape
->merge_stage
= NULL
;
2299 /* Clear pipeline flags. */
2300 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
2301 tape
->chrdev_direction
= idetape_direction_none
;
2303 /* Remove pipeline stages. */
2304 if (tape
->first_stage
== NULL
)
2307 spin_lock_irqsave(&tape
->spinlock
, flags
);
2308 tape
->next_stage
= NULL
;
2309 if (idetape_pipeline_active(tape
))
2310 idetape_wait_for_request(drive
, tape
->active_data_request
);
2311 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2313 while (tape
->first_stage
!= NULL
) {
2314 struct request
*rq_ptr
= &tape
->first_stage
->rq
;
2316 cnt
+= rq_ptr
->nr_sectors
- rq_ptr
->current_nr_sectors
;
2317 if (rq_ptr
->errors
== IDETAPE_ERROR_FILEMARK
)
2319 idetape_remove_stage_head(drive
);
2321 tape
->nr_pending_stages
= 0;
2322 tape
->max_stages
= tape
->min_pipeline
;
2327 * idetape_position_tape positions the tape to the requested block
2328 * using the LOCATE packet command. A READ POSITION command is then
2329 * issued to check where we are positioned.
2331 * Like all higher level operations, we queue the commands at the tail
2332 * of the request queue and wait for their completion.
2335 static int idetape_position_tape (ide_drive_t
*drive
, unsigned int block
, u8 partition
, int skip
)
2337 idetape_tape_t
*tape
= drive
->driver_data
;
2341 if (tape
->chrdev_direction
== idetape_direction_read
)
2342 __idetape_discard_read_pipeline(drive
);
2343 idetape_wait_ready(drive
, 60 * 5 * HZ
);
2344 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
2345 retval
= idetape_queue_pc_tail(drive
, &pc
);
2349 idetape_create_read_position_cmd(&pc
);
2350 return (idetape_queue_pc_tail(drive
, &pc
));
2353 static void idetape_discard_read_pipeline (ide_drive_t
*drive
, int restore_position
)
2355 idetape_tape_t
*tape
= drive
->driver_data
;
2359 cnt
= __idetape_discard_read_pipeline(drive
);
2360 if (restore_position
) {
2361 position
= idetape_read_position(drive
);
2362 seek
= position
> cnt
? position
- cnt
: 0;
2363 if (idetape_position_tape(drive
, seek
, 0, 0)) {
2364 printk(KERN_INFO
"ide-tape: %s: position_tape failed in discard_pipeline()\n", tape
->name
);
2371 * idetape_queue_rw_tail generates a read/write request for the block
2372 * device interface and wait for it to be serviced.
2374 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
, struct idetape_bh
*bh
)
2376 idetape_tape_t
*tape
= drive
->driver_data
;
2379 #if IDETAPE_DEBUG_LOG
2380 if (tape
->debug_level
>= 2)
2381 printk(KERN_INFO
"ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd
);
2382 #endif /* IDETAPE_DEBUG_LOG */
2383 if (idetape_pipeline_active(tape
)) {
2384 printk(KERN_ERR
"ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
2388 idetape_init_rq(&rq
, cmd
);
2389 rq
.rq_disk
= tape
->disk
;
2390 rq
.special
= (void *)bh
;
2391 rq
.sector
= tape
->first_frame_position
;
2392 rq
.nr_sectors
= rq
.current_nr_sectors
= blocks
;
2393 (void) ide_do_drive_cmd(drive
, &rq
, ide_wait
);
2395 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
2398 if (tape
->merge_stage
)
2399 idetape_init_merge_stage(tape
);
2400 if (rq
.errors
== IDETAPE_ERROR_GENERAL
)
2402 return (tape
->tape_block_size
* (blocks
-rq
.current_nr_sectors
));
2406 * idetape_insert_pipeline_into_queue is used to start servicing the
2407 * pipeline stages, starting from tape->next_stage.
2409 static void idetape_insert_pipeline_into_queue (ide_drive_t
*drive
)
2411 idetape_tape_t
*tape
= drive
->driver_data
;
2413 if (tape
->next_stage
== NULL
)
2415 if (!idetape_pipeline_active(tape
)) {
2416 set_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
2417 idetape_active_next_stage(drive
);
2418 (void) ide_do_drive_cmd(drive
, tape
->active_data_request
, ide_end
);
2422 static void idetape_create_inquiry_cmd (idetape_pc_t
*pc
)
2424 idetape_init_pc(pc
);
2426 pc
->c
[4] = pc
->request_transfer
= 254;
2427 pc
->callback
= &idetape_pc_callback
;
2430 static void idetape_create_rewind_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
)
2432 idetape_init_pc(pc
);
2433 pc
->c
[0] = REZERO_UNIT
;
2434 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2435 pc
->callback
= &idetape_pc_callback
;
2438 static void idetape_create_erase_cmd (idetape_pc_t
*pc
)
2440 idetape_init_pc(pc
);
2443 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2444 pc
->callback
= &idetape_pc_callback
;
2447 static void idetape_create_space_cmd (idetape_pc_t
*pc
,int count
, u8 cmd
)
2449 idetape_init_pc(pc
);
2451 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
2453 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2454 pc
->callback
= &idetape_pc_callback
;
2457 static void idetape_wait_first_stage (ide_drive_t
*drive
)
2459 idetape_tape_t
*tape
= drive
->driver_data
;
2460 unsigned long flags
;
2462 if (tape
->first_stage
== NULL
)
2464 spin_lock_irqsave(&tape
->spinlock
, flags
);
2465 if (tape
->active_stage
== tape
->first_stage
)
2466 idetape_wait_for_request(drive
, tape
->active_data_request
);
2467 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2471 * idetape_add_chrdev_write_request tries to add a character device
2472 * originated write request to our pipeline. In case we don't succeed,
2473 * we revert to non-pipelined operation mode for this request.
2475 * 1. Try to allocate a new pipeline stage.
2476 * 2. If we can't, wait for more and more requests to be serviced
2477 * and try again each time.
2478 * 3. If we still can't allocate a stage, fallback to
2479 * non-pipelined operation mode for this request.
2481 static int idetape_add_chrdev_write_request (ide_drive_t
*drive
, int blocks
)
2483 idetape_tape_t
*tape
= drive
->driver_data
;
2484 idetape_stage_t
*new_stage
;
2485 unsigned long flags
;
2488 #if IDETAPE_DEBUG_LOG
2489 if (tape
->debug_level
>= 3)
2490 printk(KERN_INFO
"ide-tape: Reached idetape_add_chrdev_write_request\n");
2491 #endif /* IDETAPE_DEBUG_LOG */
2494 * Attempt to allocate a new stage.
2495 * Pay special attention to possible race conditions.
2497 while ((new_stage
= idetape_kmalloc_stage(tape
)) == NULL
) {
2498 spin_lock_irqsave(&tape
->spinlock
, flags
);
2499 if (idetape_pipeline_active(tape
)) {
2500 idetape_wait_for_request(drive
, tape
->active_data_request
);
2501 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2503 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2504 idetape_insert_pipeline_into_queue(drive
);
2505 if (idetape_pipeline_active(tape
))
2508 * Linux is short on memory. Fallback to
2509 * non-pipelined operation mode for this request.
2511 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
, tape
->merge_stage
->bh
);
2514 rq
= &new_stage
->rq
;
2515 idetape_init_rq(rq
, REQ_IDETAPE_WRITE
);
2516 /* Doesn't actually matter - We always assume sequential access */
2517 rq
->sector
= tape
->first_frame_position
;
2518 rq
->nr_sectors
= rq
->current_nr_sectors
= blocks
;
2520 idetape_switch_buffers(tape
, new_stage
);
2521 idetape_add_stage_tail(drive
, new_stage
);
2522 tape
->pipeline_head
++;
2523 calculate_speeds(drive
);
2526 * Estimate whether the tape has stopped writing by checking
2527 * if our write pipeline is currently empty. If we are not
2528 * writing anymore, wait for the pipeline to be full enough
2529 * (90%) before starting to service requests, so that we will
2530 * be able to keep up with the higher speeds of the tape.
2532 if (!idetape_pipeline_active(tape
)) {
2533 if (tape
->nr_stages
>= tape
->max_stages
* 9 / 10 ||
2534 tape
->nr_stages
>= tape
->max_stages
- tape
->uncontrolled_pipeline_head_speed
* 3 * 1024 / tape
->tape_block_size
) {
2535 tape
->measure_insert_time
= 1;
2536 tape
->insert_time
= jiffies
;
2537 tape
->insert_size
= 0;
2538 tape
->insert_speed
= 0;
2539 idetape_insert_pipeline_into_queue(drive
);
2542 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
))
2543 /* Return a deferred error */
2549 * idetape_wait_for_pipeline will wait until all pending pipeline
2550 * requests are serviced. Typically called on device close.
2552 static void idetape_wait_for_pipeline (ide_drive_t
*drive
)
2554 idetape_tape_t
*tape
= drive
->driver_data
;
2555 unsigned long flags
;
2557 while (tape
->next_stage
|| idetape_pipeline_active(tape
)) {
2558 idetape_insert_pipeline_into_queue(drive
);
2559 spin_lock_irqsave(&tape
->spinlock
, flags
);
2560 if (idetape_pipeline_active(tape
))
2561 idetape_wait_for_request(drive
, tape
->active_data_request
);
2562 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2566 static void idetape_empty_write_pipeline (ide_drive_t
*drive
)
2568 idetape_tape_t
*tape
= drive
->driver_data
;
2570 struct idetape_bh
*bh
;
2572 if (tape
->chrdev_direction
!= idetape_direction_write
) {
2573 printk(KERN_ERR
"ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
2576 if (tape
->merge_stage_size
> tape
->stage_size
) {
2577 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
2578 tape
->merge_stage_size
= tape
->stage_size
;
2580 if (tape
->merge_stage_size
) {
2581 blocks
= tape
->merge_stage_size
/ tape
->tape_block_size
;
2582 if (tape
->merge_stage_size
% tape
->tape_block_size
) {
2586 i
= tape
->tape_block_size
- tape
->merge_stage_size
% tape
->tape_block_size
;
2587 bh
= tape
->bh
->b_reqnext
;
2589 atomic_set(&bh
->b_count
, 0);
2596 printk(KERN_INFO
"ide-tape: bug, bh NULL\n");
2599 min
= min(i
, (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)));
2600 memset(bh
->b_data
+ atomic_read(&bh
->b_count
), 0, min
);
2601 atomic_add(min
, &bh
->b_count
);
2606 (void) idetape_add_chrdev_write_request(drive
, blocks
);
2607 tape
->merge_stage_size
= 0;
2609 idetape_wait_for_pipeline(drive
);
2610 if (tape
->merge_stage
!= NULL
) {
2611 __idetape_kfree_stage(tape
->merge_stage
);
2612 tape
->merge_stage
= NULL
;
2614 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
2615 tape
->chrdev_direction
= idetape_direction_none
;
2618 * On the next backup, perform the feedback loop again.
2619 * (I don't want to keep sense information between backups,
2620 * as some systems are constantly on, and the system load
2621 * can be totally different on the next backup).
2623 tape
->max_stages
= tape
->min_pipeline
;
2624 if (tape
->first_stage
!= NULL
||
2625 tape
->next_stage
!= NULL
||
2626 tape
->last_stage
!= NULL
||
2627 tape
->nr_stages
!= 0) {
2628 printk(KERN_ERR
"ide-tape: ide-tape pipeline bug, "
2629 "first_stage %p, next_stage %p, "
2630 "last_stage %p, nr_stages %d\n",
2631 tape
->first_stage
, tape
->next_stage
,
2632 tape
->last_stage
, tape
->nr_stages
);
2636 static void idetape_restart_speed_control (ide_drive_t
*drive
)
2638 idetape_tape_t
*tape
= drive
->driver_data
;
2640 tape
->restart_speed_control_req
= 0;
2641 tape
->pipeline_head
= 0;
2642 tape
->controlled_last_pipeline_head
= tape
->uncontrolled_last_pipeline_head
= 0;
2643 tape
->controlled_previous_pipeline_head
= tape
->uncontrolled_previous_pipeline_head
= 0;
2644 tape
->pipeline_head_speed
= tape
->controlled_pipeline_head_speed
= 5000;
2645 tape
->uncontrolled_pipeline_head_speed
= 0;
2646 tape
->controlled_pipeline_head_time
= tape
->uncontrolled_pipeline_head_time
= jiffies
;
2647 tape
->controlled_previous_head_time
= tape
->uncontrolled_previous_head_time
= jiffies
;
2650 static int idetape_initiate_read (ide_drive_t
*drive
, int max_stages
)
2652 idetape_tape_t
*tape
= drive
->driver_data
;
2653 idetape_stage_t
*new_stage
;
2656 u16 blocks
= *(u16
*)&tape
->caps
[12];
2658 /* Initialize read operation */
2659 if (tape
->chrdev_direction
!= idetape_direction_read
) {
2660 if (tape
->chrdev_direction
== idetape_direction_write
) {
2661 idetape_empty_write_pipeline(drive
);
2662 idetape_flush_tape_buffers(drive
);
2664 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
2665 printk (KERN_ERR
"ide-tape: merge_stage_size should be 0 now\n");
2666 tape
->merge_stage_size
= 0;
2668 if ((tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 0, 0)) == NULL
)
2670 tape
->chrdev_direction
= idetape_direction_read
;
2673 * Issue a read 0 command to ensure that DSC handshake
2674 * is switched from completion mode to buffer available
2676 * No point in issuing this if DSC overlap isn't supported,
2677 * some drives (Seagate STT3401A) will return an error.
2679 if (drive
->dsc_overlap
) {
2680 bytes_read
= idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, 0, tape
->merge_stage
->bh
);
2681 if (bytes_read
< 0) {
2682 __idetape_kfree_stage(tape
->merge_stage
);
2683 tape
->merge_stage
= NULL
;
2684 tape
->chrdev_direction
= idetape_direction_none
;
2689 if (tape
->restart_speed_control_req
)
2690 idetape_restart_speed_control(drive
);
2691 idetape_init_rq(&rq
, REQ_IDETAPE_READ
);
2692 rq
.sector
= tape
->first_frame_position
;
2693 rq
.nr_sectors
= rq
.current_nr_sectors
= blocks
;
2694 if (!test_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
) &&
2695 tape
->nr_stages
< max_stages
) {
2696 new_stage
= idetape_kmalloc_stage(tape
);
2697 while (new_stage
!= NULL
) {
2699 idetape_add_stage_tail(drive
, new_stage
);
2700 if (tape
->nr_stages
>= max_stages
)
2702 new_stage
= idetape_kmalloc_stage(tape
);
2705 if (!idetape_pipeline_active(tape
)) {
2706 if (tape
->nr_pending_stages
>= 3 * max_stages
/ 4) {
2707 tape
->measure_insert_time
= 1;
2708 tape
->insert_time
= jiffies
;
2709 tape
->insert_size
= 0;
2710 tape
->insert_speed
= 0;
2711 idetape_insert_pipeline_into_queue(drive
);
2718 * idetape_add_chrdev_read_request is called from idetape_chrdev_read
2719 * to service a character device read request and add read-ahead
2720 * requests to our pipeline.
2722 static int idetape_add_chrdev_read_request (ide_drive_t
*drive
,int blocks
)
2724 idetape_tape_t
*tape
= drive
->driver_data
;
2725 unsigned long flags
;
2726 struct request
*rq_ptr
;
2729 #if IDETAPE_DEBUG_LOG
2730 if (tape
->debug_level
>= 4)
2731 printk(KERN_INFO
"ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks
);
2732 #endif /* IDETAPE_DEBUG_LOG */
2735 * If we are at a filemark, return a read length of 0
2737 if (test_bit(IDETAPE_FILEMARK
, &tape
->flags
))
2741 * Wait for the next block to be available at the head
2744 idetape_initiate_read(drive
, tape
->max_stages
);
2745 if (tape
->first_stage
== NULL
) {
2746 if (test_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
))
2748 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
, tape
->merge_stage
->bh
);
2750 idetape_wait_first_stage(drive
);
2751 rq_ptr
= &tape
->first_stage
->rq
;
2752 bytes_read
= tape
->tape_block_size
* (rq_ptr
->nr_sectors
- rq_ptr
->current_nr_sectors
);
2753 rq_ptr
->nr_sectors
= rq_ptr
->current_nr_sectors
= 0;
2756 if (rq_ptr
->errors
== IDETAPE_ERROR_EOD
)
2759 idetape_switch_buffers(tape
, tape
->first_stage
);
2760 if (rq_ptr
->errors
== IDETAPE_ERROR_FILEMARK
)
2761 set_bit(IDETAPE_FILEMARK
, &tape
->flags
);
2762 spin_lock_irqsave(&tape
->spinlock
, flags
);
2763 idetape_remove_stage_head(drive
);
2764 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2765 tape
->pipeline_head
++;
2766 calculate_speeds(drive
);
2768 if (bytes_read
> blocks
* tape
->tape_block_size
) {
2769 printk(KERN_ERR
"ide-tape: bug: trying to return more bytes than requested\n");
2770 bytes_read
= blocks
* tape
->tape_block_size
;
2772 return (bytes_read
);
2775 static void idetape_pad_zeros (ide_drive_t
*drive
, int bcount
)
2777 idetape_tape_t
*tape
= drive
->driver_data
;
2778 struct idetape_bh
*bh
;
2784 bh
= tape
->merge_stage
->bh
;
2785 count
= min(tape
->stage_size
, bcount
);
2787 blocks
= count
/ tape
->tape_block_size
;
2789 atomic_set(&bh
->b_count
, min(count
, (unsigned int)bh
->b_size
));
2790 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
2791 count
-= atomic_read(&bh
->b_count
);
2794 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
, tape
->merge_stage
->bh
);
2798 static int idetape_pipeline_size (ide_drive_t
*drive
)
2800 idetape_tape_t
*tape
= drive
->driver_data
;
2801 idetape_stage_t
*stage
;
2805 idetape_wait_for_pipeline(drive
);
2806 stage
= tape
->first_stage
;
2807 while (stage
!= NULL
) {
2809 size
+= tape
->tape_block_size
* (rq
->nr_sectors
-rq
->current_nr_sectors
);
2810 if (rq
->errors
== IDETAPE_ERROR_FILEMARK
)
2811 size
+= tape
->tape_block_size
;
2812 stage
= stage
->next
;
2814 size
+= tape
->merge_stage_size
;
2819 * Rewinds the tape to the Beginning Of the current Partition (BOP).
2821 * We currently support only one partition.
2823 static int idetape_rewind_tape (ide_drive_t
*drive
)
2827 #if IDETAPE_DEBUG_LOG
2828 idetape_tape_t
*tape
= drive
->driver_data
;
2829 if (tape
->debug_level
>= 2)
2830 printk(KERN_INFO
"ide-tape: Reached idetape_rewind_tape\n");
2831 #endif /* IDETAPE_DEBUG_LOG */
2833 idetape_create_rewind_cmd(drive
, &pc
);
2834 retval
= idetape_queue_pc_tail(drive
, &pc
);
2838 idetape_create_read_position_cmd(&pc
);
2839 retval
= idetape_queue_pc_tail(drive
, &pc
);
2846 * Our special ide-tape ioctl's.
2848 * Currently there aren't any ioctl's.
2849 * mtio.h compatible commands should be issued to the character device
2852 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
, unsigned long arg
)
2854 idetape_tape_t
*tape
= drive
->driver_data
;
2855 idetape_config_t config
;
2856 void __user
*argp
= (void __user
*)arg
;
2858 #if IDETAPE_DEBUG_LOG
2859 if (tape
->debug_level
>= 4)
2860 printk(KERN_INFO
"ide-tape: Reached idetape_blkdev_ioctl\n");
2861 #endif /* IDETAPE_DEBUG_LOG */
2864 if (copy_from_user(&config
, argp
, sizeof (idetape_config_t
)))
2866 tape
->best_dsc_rw_frequency
= config
.dsc_rw_frequency
;
2867 tape
->max_stages
= config
.nr_stages
;
2870 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_frequency
;
2871 config
.nr_stages
= tape
->max_stages
;
2872 if (copy_to_user(argp
, &config
, sizeof (idetape_config_t
)))
2882 * idetape_space_over_filemarks is now a bit more complicated than just
2883 * passing the command to the tape since we may have crossed some
2884 * filemarks during our pipelined read-ahead mode.
2886 * As a minor side effect, the pipeline enables us to support MTFSFM when
2887 * the filemark is in our internal pipeline even if the tape doesn't
2888 * support spacing over filemarks in the reverse direction.
2890 static int idetape_space_over_filemarks (ide_drive_t
*drive
,short mt_op
,int mt_count
)
2892 idetape_tape_t
*tape
= drive
->driver_data
;
2894 unsigned long flags
;
2896 int sprev
= !!(tape
->caps
[4] & 0x20);
2900 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
2903 mt_count
= - mt_count
;
2906 if (tape
->chrdev_direction
== idetape_direction_read
) {
2908 * We have a read-ahead buffer. Scan it for crossed
2911 tape
->merge_stage_size
= 0;
2912 if (test_and_clear_bit(IDETAPE_FILEMARK
, &tape
->flags
))
2914 while (tape
->first_stage
!= NULL
) {
2915 if (count
== mt_count
) {
2916 if (mt_op
== MTFSFM
)
2917 set_bit(IDETAPE_FILEMARK
, &tape
->flags
);
2920 spin_lock_irqsave(&tape
->spinlock
, flags
);
2921 if (tape
->first_stage
== tape
->active_stage
) {
2923 * We have reached the active stage in the read pipeline.
2924 * There is no point in allowing the drive to continue
2925 * reading any farther, so we stop the pipeline.
2927 * This section should be moved to a separate subroutine,
2928 * because a similar function is performed in
2929 * __idetape_discard_read_pipeline(), for example.
2931 tape
->next_stage
= NULL
;
2932 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2933 idetape_wait_first_stage(drive
);
2934 tape
->next_stage
= tape
->first_stage
->next
;
2936 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2937 if (tape
->first_stage
->rq
.errors
== IDETAPE_ERROR_FILEMARK
)
2939 idetape_remove_stage_head(drive
);
2941 idetape_discard_read_pipeline(drive
, 0);
2945 * The filemark was not found in our internal pipeline.
2946 * Now we can issue the space command.
2951 idetape_create_space_cmd(&pc
,mt_count
-count
,IDETAPE_SPACE_OVER_FILEMARK
);
2952 return (idetape_queue_pc_tail(drive
, &pc
));
2957 retval
= idetape_space_over_filemarks(drive
, MTFSF
, mt_count
-count
);
2958 if (retval
) return (retval
);
2959 count
= (MTBSFM
== mt_op
? 1 : -1);
2960 return (idetape_space_over_filemarks(drive
, MTFSF
, count
));
2962 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",mt_op
);
2969 * Our character device read / write functions.
2971 * The tape is optimized to maximize throughput when it is transferring
2972 * an integral number of the "continuous transfer limit", which is
2973 * a parameter of the specific tape (26 KB on my particular tape).
2974 * (32 kB for Onstream)
2976 * As of version 1.3 of the driver, the character device provides an
2977 * abstract continuous view of the media - any mix of block sizes (even 1
2978 * byte) on the same backup/restore procedure is supported. The driver
2979 * will internally convert the requests to the recommended transfer unit,
2980 * so that an unmatch between the user's block size to the recommended
2981 * size will only result in a (slightly) increased driver overhead, but
2982 * will no longer hit performance.
2983 * This is not applicable to Onstream.
2985 static ssize_t
idetape_chrdev_read (struct file
*file
, char __user
*buf
,
2986 size_t count
, loff_t
*ppos
)
2988 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2989 ide_drive_t
*drive
= tape
->drive
;
2990 ssize_t bytes_read
,temp
, actually_read
= 0, rc
;
2992 u16 ctl
= *(u16
*)&tape
->caps
[12];
2994 #if IDETAPE_DEBUG_LOG
2995 if (tape
->debug_level
>= 3)
2996 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_read, count %Zd\n", count
);
2997 #endif /* IDETAPE_DEBUG_LOG */
2999 if (tape
->chrdev_direction
!= idetape_direction_read
) {
3000 if (test_bit(IDETAPE_DETECT_BS
, &tape
->flags
))
3001 if (count
> tape
->tape_block_size
&&
3002 (count
% tape
->tape_block_size
) == 0)
3003 tape
->user_bs_factor
= count
/ tape
->tape_block_size
;
3005 if ((rc
= idetape_initiate_read(drive
, tape
->max_stages
)) < 0)
3009 if (tape
->merge_stage_size
) {
3010 actually_read
= min((unsigned int)(tape
->merge_stage_size
), (unsigned int)count
);
3011 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
, actually_read
))
3013 buf
+= actually_read
;
3014 tape
->merge_stage_size
-= actually_read
;
3015 count
-= actually_read
;
3017 while (count
>= tape
->stage_size
) {
3018 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
3019 if (bytes_read
<= 0)
3021 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
, bytes_read
))
3024 count
-= bytes_read
;
3025 actually_read
+= bytes_read
;
3028 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
3029 if (bytes_read
<= 0)
3031 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
3032 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
, temp
))
3034 actually_read
+= temp
;
3035 tape
->merge_stage_size
= bytes_read
-temp
;
3038 if (!actually_read
&& test_bit(IDETAPE_FILEMARK
, &tape
->flags
)) {
3039 #if IDETAPE_DEBUG_LOG
3040 if (tape
->debug_level
>= 2)
3041 printk(KERN_INFO
"ide-tape: %s: spacing over filemark\n", tape
->name
);
3043 idetape_space_over_filemarks(drive
, MTFSF
, 1);
3047 return (ret
) ? ret
: actually_read
;
3050 static ssize_t
idetape_chrdev_write (struct file
*file
, const char __user
*buf
,
3051 size_t count
, loff_t
*ppos
)
3053 struct ide_tape_obj
*tape
= ide_tape_f(file
);
3054 ide_drive_t
*drive
= tape
->drive
;
3055 ssize_t actually_written
= 0;
3057 u16 ctl
= *(u16
*)&tape
->caps
[12];
3059 /* The drive is write protected. */
3060 if (tape
->write_prot
)
3063 #if IDETAPE_DEBUG_LOG
3064 if (tape
->debug_level
>= 3)
3065 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_write, "
3066 "count %Zd\n", count
);
3067 #endif /* IDETAPE_DEBUG_LOG */
3069 /* Initialize write operation */
3070 if (tape
->chrdev_direction
!= idetape_direction_write
) {
3071 if (tape
->chrdev_direction
== idetape_direction_read
)
3072 idetape_discard_read_pipeline(drive
, 1);
3073 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
3074 printk(KERN_ERR
"ide-tape: merge_stage_size "
3075 "should be 0 now\n");
3076 tape
->merge_stage_size
= 0;
3078 if ((tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 0, 0)) == NULL
)
3080 tape
->chrdev_direction
= idetape_direction_write
;
3081 idetape_init_merge_stage(tape
);
3084 * Issue a write 0 command to ensure that DSC handshake
3085 * is switched from completion mode to buffer available
3087 * No point in issuing this if DSC overlap isn't supported,
3088 * some drives (Seagate STT3401A) will return an error.
3090 if (drive
->dsc_overlap
) {
3091 ssize_t retval
= idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, 0, tape
->merge_stage
->bh
);
3093 __idetape_kfree_stage(tape
->merge_stage
);
3094 tape
->merge_stage
= NULL
;
3095 tape
->chrdev_direction
= idetape_direction_none
;
3102 if (tape
->restart_speed_control_req
)
3103 idetape_restart_speed_control(drive
);
3104 if (tape
->merge_stage_size
) {
3105 if (tape
->merge_stage_size
>= tape
->stage_size
) {
3106 printk(KERN_ERR
"ide-tape: bug: merge buffer too big\n");
3107 tape
->merge_stage_size
= 0;
3109 actually_written
= min((unsigned int)(tape
->stage_size
- tape
->merge_stage_size
), (unsigned int)count
);
3110 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
, actually_written
))
3112 buf
+= actually_written
;
3113 tape
->merge_stage_size
+= actually_written
;
3114 count
-= actually_written
;
3116 if (tape
->merge_stage_size
== tape
->stage_size
) {
3118 tape
->merge_stage_size
= 0;
3119 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
3124 while (count
>= tape
->stage_size
) {
3126 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
, tape
->stage_size
))
3128 buf
+= tape
->stage_size
;
3129 count
-= tape
->stage_size
;
3130 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
3131 actually_written
+= tape
->stage_size
;
3136 actually_written
+= count
;
3137 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
, count
))
3139 tape
->merge_stage_size
+= count
;
3141 return (ret
) ? ret
: actually_written
;
3144 static int idetape_write_filemark (ide_drive_t
*drive
)
3148 /* Write a filemark */
3149 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
3150 if (idetape_queue_pc_tail(drive
, &pc
)) {
3151 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
3158 * idetape_mtioctop is called from idetape_chrdev_ioctl when
3159 * the general mtio MTIOCTOP ioctl is requested.
3161 * We currently support the following mtio.h operations:
3163 * MTFSF - Space over mt_count filemarks in the positive direction.
3164 * The tape is positioned after the last spaced filemark.
3166 * MTFSFM - Same as MTFSF, but the tape is positioned before the
3169 * MTBSF - Steps background over mt_count filemarks, tape is
3170 * positioned before the last filemark.
3172 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark.
3176 * MTBSF and MTBSFM are not supported when the tape doesn't
3177 * support spacing over filemarks in the reverse direction.
3178 * In this case, MTFSFM is also usually not supported (it is
3179 * supported in the rare case in which we crossed the filemark
3180 * during our read-ahead pipelined operation mode).
3182 * MTWEOF - Writes mt_count filemarks. Tape is positioned after
3183 * the last written filemark.
3185 * MTREW - Rewinds tape.
3187 * MTLOAD - Loads the tape.
3189 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and
3190 * MTUNLOAD prevents further access until the media is replaced.
3192 * MTNOP - Flushes tape buffers.
3194 * MTRETEN - Retension media. This typically consists of one end
3195 * to end pass on the media.
3197 * MTEOM - Moves to the end of recorded data.
3199 * MTERASE - Erases tape.
3201 * MTSETBLK - Sets the user block size to mt_count bytes. If
3202 * mt_count is 0, we will attempt to autodetect
3205 * MTSEEK - Positions the tape in a specific block number, where
3206 * each block is assumed to contain which user_block_size
3209 * MTSETPART - Switches to another tape partition.
3211 * MTLOCK - Locks the tape door.
3213 * MTUNLOCK - Unlocks the tape door.
3215 * The following commands are currently not supported:
3217 * MTFSS, MTBSS, MTWSM, MTSETDENSITY,
3218 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD.
3220 static int idetape_mtioctop (ide_drive_t
*drive
,short mt_op
,int mt_count
)
3222 idetape_tape_t
*tape
= drive
->driver_data
;
3226 #if IDETAPE_DEBUG_LOG
3227 if (tape
->debug_level
>= 1)
3228 printk(KERN_INFO
"ide-tape: Handling MTIOCTOP ioctl: "
3229 "mt_op=%d, mt_count=%d\n", mt_op
, mt_count
);
3230 #endif /* IDETAPE_DEBUG_LOG */
3232 * Commands which need our pipelined read-ahead stages.
3241 return (idetape_space_over_filemarks(drive
,mt_op
,mt_count
));
3247 if (tape
->write_prot
)
3249 idetape_discard_read_pipeline(drive
, 1);
3250 for (i
= 0; i
< mt_count
; i
++) {
3251 retval
= idetape_write_filemark(drive
);
3257 idetape_discard_read_pipeline(drive
, 0);
3258 if (idetape_rewind_tape(drive
))
3262 idetape_discard_read_pipeline(drive
, 0);
3263 idetape_create_load_unload_cmd(drive
, &pc
, IDETAPE_LU_LOAD_MASK
);
3264 return (idetape_queue_pc_tail(drive
, &pc
));
3268 * If door is locked, attempt to unlock before
3269 * attempting to eject.
3271 if (tape
->door_locked
) {
3272 if (idetape_create_prevent_cmd(drive
, &pc
, 0))
3273 if (!idetape_queue_pc_tail(drive
, &pc
))
3274 tape
->door_locked
= DOOR_UNLOCKED
;
3276 idetape_discard_read_pipeline(drive
, 0);
3277 idetape_create_load_unload_cmd(drive
, &pc
,!IDETAPE_LU_LOAD_MASK
);
3278 retval
= idetape_queue_pc_tail(drive
, &pc
);
3280 clear_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
);
3283 idetape_discard_read_pipeline(drive
, 0);
3284 return (idetape_flush_tape_buffers(drive
));
3286 idetape_discard_read_pipeline(drive
, 0);
3287 idetape_create_load_unload_cmd(drive
, &pc
,IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
3288 return (idetape_queue_pc_tail(drive
, &pc
));
3290 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
3291 return (idetape_queue_pc_tail(drive
, &pc
));
3293 (void) idetape_rewind_tape(drive
);
3294 idetape_create_erase_cmd(&pc
);
3295 return (idetape_queue_pc_tail(drive
, &pc
));
3298 if (mt_count
< tape
->tape_block_size
|| mt_count
% tape
->tape_block_size
)
3300 tape
->user_bs_factor
= mt_count
/ tape
->tape_block_size
;
3301 clear_bit(IDETAPE_DETECT_BS
, &tape
->flags
);
3303 set_bit(IDETAPE_DETECT_BS
, &tape
->flags
);
3306 idetape_discard_read_pipeline(drive
, 0);
3307 return idetape_position_tape(drive
, mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
3309 idetape_discard_read_pipeline(drive
, 0);
3310 return (idetape_position_tape(drive
, 0, mt_count
, 0));
3314 if (!idetape_create_prevent_cmd(drive
, &pc
, 1))
3316 retval
= idetape_queue_pc_tail(drive
, &pc
);
3317 if (retval
) return retval
;
3318 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
3321 if (!idetape_create_prevent_cmd(drive
, &pc
, 0))
3323 retval
= idetape_queue_pc_tail(drive
, &pc
);
3324 if (retval
) return retval
;
3325 tape
->door_locked
= DOOR_UNLOCKED
;
3328 printk(KERN_ERR
"ide-tape: MTIO operation %d not "
3329 "supported\n", mt_op
);
3335 * Our character device ioctls.
3337 * General mtio.h magnetic io commands are supported here, and not in
3338 * the corresponding block interface.
3340 * The following ioctls are supported:
3342 * MTIOCTOP - Refer to idetape_mtioctop for detailed description.
3344 * MTIOCGET - The mt_dsreg field in the returned mtget structure
3345 * will be set to (user block size in bytes <<
3346 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK.
3348 * The mt_blkno is set to the current user block number.
3349 * The other mtget fields are not supported.
3351 * MTIOCPOS - The current tape "block position" is returned. We
3352 * assume that each block contains user_block_size
3355 * Our own ide-tape ioctls are supported on both interfaces.
3357 static int idetape_chrdev_ioctl (struct inode
*inode
, struct file
*file
, unsigned int cmd
, unsigned long arg
)
3359 struct ide_tape_obj
*tape
= ide_tape_f(file
);
3360 ide_drive_t
*drive
= tape
->drive
;
3364 int block_offset
= 0, position
= tape
->first_frame_position
;
3365 void __user
*argp
= (void __user
*)arg
;
3367 #if IDETAPE_DEBUG_LOG
3368 if (tape
->debug_level
>= 3)
3369 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_ioctl, "
3371 #endif /* IDETAPE_DEBUG_LOG */
3373 tape
->restart_speed_control_req
= 1;
3374 if (tape
->chrdev_direction
== idetape_direction_write
) {
3375 idetape_empty_write_pipeline(drive
);
3376 idetape_flush_tape_buffers(drive
);
3378 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
3379 block_offset
= idetape_pipeline_size(drive
) / (tape
->tape_block_size
* tape
->user_bs_factor
);
3380 if ((position
= idetape_read_position(drive
)) < 0)
3385 if (copy_from_user(&mtop
, argp
, sizeof (struct mtop
)))
3387 return (idetape_mtioctop(drive
,mtop
.mt_op
,mtop
.mt_count
));
3389 memset(&mtget
, 0, sizeof (struct mtget
));
3390 mtget
.mt_type
= MT_ISSCSI2
;
3391 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
3392 mtget
.mt_dsreg
= ((tape
->tape_block_size
* tape
->user_bs_factor
) << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
3393 if (tape
->drv_write_prot
) {
3394 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
3396 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
3400 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
3401 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
3405 if (tape
->chrdev_direction
== idetape_direction_read
)
3406 idetape_discard_read_pipeline(drive
, 1);
3407 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
3412 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
3413 * block size with the reported value.
3415 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
3417 idetape_tape_t
*tape
= drive
->driver_data
;
3420 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
3421 if (idetape_queue_pc_tail(drive
, &pc
)) {
3422 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
3423 if (tape
->tape_block_size
== 0) {
3424 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
3425 "block size, assuming 32k\n");
3426 tape
->tape_block_size
= 32768;
3430 tape
->tape_block_size
= (pc
.buffer
[4 + 5] << 16) +
3431 (pc
.buffer
[4 + 6] << 8) +
3433 tape
->drv_write_prot
= (pc
.buffer
[2] & 0x80) >> 7;
3437 * Our character device open function.
3439 static int idetape_chrdev_open (struct inode
*inode
, struct file
*filp
)
3441 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
3443 idetape_tape_t
*tape
;
3448 * We really want to do nonseekable_open(inode, filp); here, but some
3449 * versions of tar incorrectly call lseek on tapes and bail out if that
3450 * fails. So we disallow pread() and pwrite(), but permit lseeks.
3452 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
3454 #if IDETAPE_DEBUG_LOG
3455 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_open\n");
3456 #endif /* IDETAPE_DEBUG_LOG */
3458 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
3461 if (!(tape
= ide_tape_chrdev_get(i
)))
3464 drive
= tape
->drive
;
3466 filp
->private_data
= tape
;
3468 if (test_and_set_bit(IDETAPE_BUSY
, &tape
->flags
)) {
3473 retval
= idetape_wait_ready(drive
, 60 * HZ
);
3475 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
3476 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
3480 idetape_read_position(drive
);
3481 if (!test_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
))
3482 (void)idetape_rewind_tape(drive
);
3484 if (tape
->chrdev_direction
!= idetape_direction_read
)
3485 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
3487 /* Read block size and write protect status from drive. */
3488 ide_tape_get_bsize_from_bdesc(drive
);
3490 /* Set write protect flag if device is opened as read-only. */
3491 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
3492 tape
->write_prot
= 1;
3494 tape
->write_prot
= tape
->drv_write_prot
;
3496 /* Make sure drive isn't write protected if user wants to write. */
3497 if (tape
->write_prot
) {
3498 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
3499 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
3500 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
3507 * Lock the tape drive door so user can't eject.
3509 if (tape
->chrdev_direction
== idetape_direction_none
) {
3510 if (idetape_create_prevent_cmd(drive
, &pc
, 1)) {
3511 if (!idetape_queue_pc_tail(drive
, &pc
)) {
3512 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
3513 tape
->door_locked
= DOOR_LOCKED
;
3517 idetape_restart_speed_control(drive
);
3518 tape
->restart_speed_control_req
= 0;
3526 static void idetape_write_release (ide_drive_t
*drive
, unsigned int minor
)
3528 idetape_tape_t
*tape
= drive
->driver_data
;
3530 idetape_empty_write_pipeline(drive
);
3531 tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 1, 0);
3532 if (tape
->merge_stage
!= NULL
) {
3533 idetape_pad_zeros(drive
, tape
->tape_block_size
* (tape
->user_bs_factor
- 1));
3534 __idetape_kfree_stage(tape
->merge_stage
);
3535 tape
->merge_stage
= NULL
;
3537 idetape_write_filemark(drive
);
3538 idetape_flush_tape_buffers(drive
);
3539 idetape_flush_tape_buffers(drive
);
3543 * Our character device release function.
3545 static int idetape_chrdev_release (struct inode
*inode
, struct file
*filp
)
3547 struct ide_tape_obj
*tape
= ide_tape_f(filp
);
3548 ide_drive_t
*drive
= tape
->drive
;
3550 unsigned int minor
= iminor(inode
);
3553 tape
= drive
->driver_data
;
3554 #if IDETAPE_DEBUG_LOG
3555 if (tape
->debug_level
>= 3)
3556 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_release\n");
3557 #endif /* IDETAPE_DEBUG_LOG */
3559 if (tape
->chrdev_direction
== idetape_direction_write
)
3560 idetape_write_release(drive
, minor
);
3561 if (tape
->chrdev_direction
== idetape_direction_read
) {
3563 idetape_discard_read_pipeline(drive
, 1);
3565 idetape_wait_for_pipeline(drive
);
3567 if (tape
->cache_stage
!= NULL
) {
3568 __idetape_kfree_stage(tape
->cache_stage
);
3569 tape
->cache_stage
= NULL
;
3571 if (minor
< 128 && test_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
))
3572 (void) idetape_rewind_tape(drive
);
3573 if (tape
->chrdev_direction
== idetape_direction_none
) {
3574 if (tape
->door_locked
== DOOR_LOCKED
) {
3575 if (idetape_create_prevent_cmd(drive
, &pc
, 0)) {
3576 if (!idetape_queue_pc_tail(drive
, &pc
))
3577 tape
->door_locked
= DOOR_UNLOCKED
;
3581 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
3588 * idetape_identify_device is called to check the contents of the
3589 * ATAPI IDENTIFY command results. We return:
3591 * 1 If the tape can be supported by us, based on the information
3594 * 0 If this tape driver is not currently supported by us.
3596 static int idetape_identify_device (ide_drive_t
*drive
)
3598 struct idetape_id_gcw gcw
;
3599 struct hd_driveid
*id
= drive
->id
;
3601 if (drive
->id_read
== 0)
3604 *((unsigned short *) &gcw
) = id
->config
;
3606 /* Check that we can support this device */
3608 if (gcw
.protocol
!= 2)
3609 printk(KERN_ERR
"ide-tape: Protocol (0x%02x) is not ATAPI\n",
3611 else if (gcw
.device_type
!= 1)
3612 printk(KERN_ERR
"ide-tape: Device type (0x%02x) is not set "
3613 "to tape\n", gcw
.device_type
);
3614 else if (!gcw
.removable
)
3615 printk(KERN_ERR
"ide-tape: The removable flag is not set\n");
3616 else if (gcw
.packet_size
!= 0) {
3617 printk(KERN_ERR
"ide-tape: Packet size (0x%02x) is not 12 "
3618 "bytes long\n", gcw
.packet_size
);
3624 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
3627 idetape_tape_t
*tape
= drive
->driver_data
;
3630 idetape_create_inquiry_cmd(&pc
);
3631 if (idetape_queue_pc_tail(drive
, &pc
)) {
3632 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
3636 memcpy(tape
->vendor_id
, &pc
.buffer
[8], 8);
3637 memcpy(tape
->product_id
, &pc
.buffer
[16], 16);
3638 memcpy(tape
->firmware_revision
, &pc
.buffer
[32], 4);
3640 ide_fixstring(tape
->vendor_id
, 10, 0);
3641 ide_fixstring(tape
->product_id
, 18, 0);
3642 ide_fixstring(tape
->firmware_revision
, 6, 0);
3643 r
= tape
->firmware_revision
;
3644 if (*(r
+ 1) == '.')
3645 tape
->firmware_revision_num
= (*r
- '0') * 100 +
3646 (*(r
+ 2) - '0') * 10 + *(r
+ 3) - '0';
3647 printk(KERN_INFO
"ide-tape: %s <-> %s: %s %s rev %s\n",
3648 drive
->name
, tape
->name
, tape
->vendor_id
,
3649 tape
->product_id
, tape
->firmware_revision
);
3653 * Ask the tape about its various parameters. In particular, we will adjust our
3654 * data transfer buffer size to the recommended value as returned by the tape.
3656 static void idetape_get_mode_sense_results (ide_drive_t
*drive
)
3658 idetape_tape_t
*tape
= drive
->driver_data
;
3661 u8 speed
, max_speed
;
3663 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
3664 if (idetape_queue_pc_tail(drive
, &pc
)) {
3665 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
3666 " some default values\n");
3667 tape
->tape_block_size
= 512;
3668 put_unaligned(52, (u16
*)&tape
->caps
[12]);
3669 put_unaligned(540, (u16
*)&tape
->caps
[14]);
3670 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
3673 caps
= pc
.buffer
+ 4 + pc
.buffer
[3];
3675 /* convert to host order and save for later use */
3676 speed
= be16_to_cpu(*(u16
*)&caps
[14]);
3677 max_speed
= be16_to_cpu(*(u16
*)&caps
[8]);
3679 put_unaligned(max_speed
, (u16
*)&caps
[8]);
3680 put_unaligned(be16_to_cpu(*(u16
*)&caps
[12]), (u16
*)&caps
[12]);
3681 put_unaligned(speed
, (u16
*)&caps
[14]);
3682 put_unaligned(be16_to_cpu(*(u16
*)&caps
[16]), (u16
*)&caps
[16]);
3685 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
3686 "(assuming 650KB/sec)\n", drive
->name
);
3687 put_unaligned(650, (u16
*)&caps
[14]);
3690 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
3691 "(assuming 650KB/sec)\n", drive
->name
);
3692 put_unaligned(650, (u16
*)&caps
[8]);
3695 memcpy(&tape
->caps
, caps
, 20);
3697 tape
->tape_block_size
= 512;
3698 else if (caps
[7] & 0x04)
3699 tape
->tape_block_size
= 1024;
3702 #ifdef CONFIG_IDE_PROC_FS
3703 static void idetape_add_settings (ide_drive_t
*drive
)
3705 idetape_tape_t
*tape
= drive
->driver_data
;
3708 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
3710 ide_add_setting(drive
, "buffer", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
3711 1, 2, (u16
*)&tape
->caps
[16], NULL
);
3712 ide_add_setting(drive
, "pipeline_min", SETTING_RW
, TYPE_INT
, 1, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->min_pipeline
, NULL
);
3713 ide_add_setting(drive
, "pipeline", SETTING_RW
, TYPE_INT
, 1, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->max_stages
, NULL
);
3714 ide_add_setting(drive
, "pipeline_max", SETTING_RW
, TYPE_INT
, 1, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->max_pipeline
, NULL
);
3715 ide_add_setting(drive
, "pipeline_used", SETTING_READ
, TYPE_INT
, 0, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->nr_stages
, NULL
);
3716 ide_add_setting(drive
, "pipeline_pending", SETTING_READ
, TYPE_INT
, 0, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->nr_pending_stages
, NULL
);
3717 ide_add_setting(drive
, "speed", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
3718 1, 1, (u16
*)&tape
->caps
[14], NULL
);
3719 ide_add_setting(drive
, "stage", SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1024, &tape
->stage_size
, NULL
);
3720 ide_add_setting(drive
, "tdsc", SETTING_RW
, TYPE_INT
, IDETAPE_DSC_RW_MIN
, IDETAPE_DSC_RW_MAX
, 1000, HZ
, &tape
->best_dsc_rw_frequency
, NULL
);
3721 ide_add_setting(drive
, "dsc_overlap", SETTING_RW
, TYPE_BYTE
, 0, 1, 1, 1, &drive
->dsc_overlap
, NULL
);
3722 ide_add_setting(drive
, "pipeline_head_speed_c",SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->controlled_pipeline_head_speed
, NULL
);
3723 ide_add_setting(drive
, "pipeline_head_speed_u",SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->uncontrolled_pipeline_head_speed
,NULL
);
3724 ide_add_setting(drive
, "avg_speed", SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->avg_speed
, NULL
);
3725 ide_add_setting(drive
, "debug_level", SETTING_RW
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->debug_level
, NULL
);
3728 static inline void idetape_add_settings(ide_drive_t
*drive
) { ; }
3732 * ide_setup is called to:
3734 * 1. Initialize our various state variables.
3735 * 2. Ask the tape for its capabilities.
3736 * 3. Allocate a buffer which will be used for data
3737 * transfer. The buffer size is chosen based on
3738 * the recommendation which we received in step (2).
3740 * Note that at this point ide.c already assigned us an irq, so that
3741 * we can queue requests here and wait for their completion.
3743 static void idetape_setup (ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
3745 unsigned long t1
, tmid
, tn
, t
;
3747 struct idetape_id_gcw gcw
;
3750 u16
*ctl
= (u16
*)&tape
->caps
[12];
3752 spin_lock_init(&tape
->spinlock
);
3753 drive
->dsc_overlap
= 1;
3754 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
3755 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
3757 drive
->dsc_overlap
= 0;
3759 /* Seagate Travan drives do not support DSC overlap. */
3760 if (strstr(drive
->id
->model
, "Seagate STT3401"))
3761 drive
->dsc_overlap
= 0;
3762 tape
->minor
= minor
;
3763 tape
->name
[0] = 'h';
3764 tape
->name
[1] = 't';
3765 tape
->name
[2] = '0' + minor
;
3766 tape
->chrdev_direction
= idetape_direction_none
;
3767 tape
->pc
= tape
->pc_stack
;
3768 tape
->max_insert_speed
= 10000;
3769 tape
->speed_control
= 1;
3770 *((unsigned short *) &gcw
) = drive
->id
->config
;
3771 if (gcw
.drq_type
== 1)
3772 set_bit(IDETAPE_DRQ_INTERRUPT
, &tape
->flags
);
3774 tape
->min_pipeline
= tape
->max_pipeline
= tape
->max_stages
= 10;
3776 idetape_get_inquiry_results(drive
);
3777 idetape_get_mode_sense_results(drive
);
3778 ide_tape_get_bsize_from_bdesc(drive
);
3779 tape
->user_bs_factor
= 1;
3780 tape
->stage_size
= *ctl
* tape
->tape_block_size
;
3781 while (tape
->stage_size
> 0xffff) {
3782 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
3784 tape
->stage_size
= *ctl
* tape
->tape_block_size
;
3786 stage_size
= tape
->stage_size
;
3787 tape
->pages_per_stage
= stage_size
/ PAGE_SIZE
;
3788 if (stage_size
% PAGE_SIZE
) {
3789 tape
->pages_per_stage
++;
3790 tape
->excess_bh_size
= PAGE_SIZE
- stage_size
% PAGE_SIZE
;
3793 /* Select the "best" DSC read/write polling freq and pipeline size. */
3794 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
3796 tape
->max_stages
= speed
* 1000 * 10 / tape
->stage_size
;
3799 * Limit memory use for pipeline to 10% of physical memory
3802 if (tape
->max_stages
* tape
->stage_size
> si
.totalram
* si
.mem_unit
/ 10)
3803 tape
->max_stages
= si
.totalram
* si
.mem_unit
/ (10 * tape
->stage_size
);
3804 tape
->max_stages
= min(tape
->max_stages
, IDETAPE_MAX_PIPELINE_STAGES
);
3805 tape
->min_pipeline
= min(tape
->max_stages
, IDETAPE_MIN_PIPELINE_STAGES
);
3806 tape
->max_pipeline
= min(tape
->max_stages
* 2, IDETAPE_MAX_PIPELINE_STAGES
);
3807 if (tape
->max_stages
== 0)
3808 tape
->max_stages
= tape
->min_pipeline
= tape
->max_pipeline
= 1;
3810 t1
= (tape
->stage_size
* HZ
) / (speed
* 1000);
3811 tmid
= (*(u16
*)&tape
->caps
[16] * 32 * HZ
) / (speed
* 125);
3812 tn
= (IDETAPE_FIFO_THRESHOLD
* tape
->stage_size
* HZ
) / (speed
* 1000);
3814 if (tape
->max_stages
)
3820 * Ensure that the number we got makes sense; limit
3821 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
3823 tape
->best_dsc_rw_frequency
= max_t(unsigned long, min_t(unsigned long, t
, IDETAPE_DSC_RW_MAX
), IDETAPE_DSC_RW_MIN
);
3824 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
3825 "%dkB pipeline, %lums tDSC%s\n",
3826 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
3827 (*(u16
*)&tape
->caps
[16] * 512) / tape
->stage_size
,
3828 tape
->stage_size
/ 1024,
3829 tape
->max_stages
* tape
->stage_size
/ 1024,
3830 tape
->best_dsc_rw_frequency
* 1000 / HZ
,
3831 drive
->using_dma
? ", DMA":"");
3833 idetape_add_settings(drive
);
3836 static void ide_tape_remove(ide_drive_t
*drive
)
3838 idetape_tape_t
*tape
= drive
->driver_data
;
3840 ide_proc_unregister_driver(drive
, tape
->driver
);
3842 ide_unregister_region(tape
->disk
);
3847 static void ide_tape_release(struct kref
*kref
)
3849 struct ide_tape_obj
*tape
= to_ide_tape(kref
);
3850 ide_drive_t
*drive
= tape
->drive
;
3851 struct gendisk
*g
= tape
->disk
;
3853 BUG_ON(tape
->first_stage
!= NULL
|| tape
->merge_stage_size
);
3855 drive
->dsc_overlap
= 0;
3856 drive
->driver_data
= NULL
;
3857 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
3858 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
3859 idetape_devs
[tape
->minor
] = NULL
;
3860 g
->private_data
= NULL
;
3865 #ifdef CONFIG_IDE_PROC_FS
3866 static int proc_idetape_read_name
3867 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
3869 ide_drive_t
*drive
= (ide_drive_t
*) data
;
3870 idetape_tape_t
*tape
= drive
->driver_data
;
3874 len
= sprintf(out
, "%s\n", tape
->name
);
3875 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
3878 static ide_proc_entry_t idetape_proc
[] = {
3879 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
3880 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
3881 { NULL
, 0, NULL
, NULL
}
3885 static int ide_tape_probe(ide_drive_t
*);
3887 static ide_driver_t idetape_driver
= {
3889 .owner
= THIS_MODULE
,
3891 .bus
= &ide_bus_type
,
3893 .probe
= ide_tape_probe
,
3894 .remove
= ide_tape_remove
,
3895 .version
= IDETAPE_VERSION
,
3897 .supports_dsc_overlap
= 1,
3898 .do_request
= idetape_do_request
,
3899 .end_request
= idetape_end_request
,
3900 .error
= __ide_error
,
3901 .abort
= __ide_abort
,
3902 #ifdef CONFIG_IDE_PROC_FS
3903 .proc
= idetape_proc
,
3908 * Our character device supporting functions, passed to register_chrdev.
3910 static const struct file_operations idetape_fops
= {
3911 .owner
= THIS_MODULE
,
3912 .read
= idetape_chrdev_read
,
3913 .write
= idetape_chrdev_write
,
3914 .ioctl
= idetape_chrdev_ioctl
,
3915 .open
= idetape_chrdev_open
,
3916 .release
= idetape_chrdev_release
,
3919 static int idetape_open(struct inode
*inode
, struct file
*filp
)
3921 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
3922 struct ide_tape_obj
*tape
;
3924 if (!(tape
= ide_tape_get(disk
)))
3930 static int idetape_release(struct inode
*inode
, struct file
*filp
)
3932 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
3933 struct ide_tape_obj
*tape
= ide_tape_g(disk
);
3940 static int idetape_ioctl(struct inode
*inode
, struct file
*file
,
3941 unsigned int cmd
, unsigned long arg
)
3943 struct block_device
*bdev
= inode
->i_bdev
;
3944 struct ide_tape_obj
*tape
= ide_tape_g(bdev
->bd_disk
);
3945 ide_drive_t
*drive
= tape
->drive
;
3946 int err
= generic_ide_ioctl(drive
, file
, bdev
, cmd
, arg
);
3948 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
3952 static struct block_device_operations idetape_block_ops
= {
3953 .owner
= THIS_MODULE
,
3954 .open
= idetape_open
,
3955 .release
= idetape_release
,
3956 .ioctl
= idetape_ioctl
,
3959 static int ide_tape_probe(ide_drive_t
*drive
)
3961 idetape_tape_t
*tape
;
3965 if (!strstr("ide-tape", drive
->driver_req
))
3967 if (!drive
->present
)
3969 if (drive
->media
!= ide_tape
)
3971 if (!idetape_identify_device (drive
)) {
3972 printk(KERN_ERR
"ide-tape: %s: not supported by this version of ide-tape\n", drive
->name
);
3976 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive
->name
);
3979 if (strstr(drive
->id
->model
, "OnStream DI-")) {
3980 printk(KERN_WARNING
"ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive
->name
);
3981 printk(KERN_WARNING
"ide-tape: OnStream support will be removed soon from ide-tape!\n");
3983 tape
= kzalloc(sizeof (idetape_tape_t
), GFP_KERNEL
);
3985 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape structure\n", drive
->name
);
3989 g
= alloc_disk(1 << PARTN_BITS
);
3993 ide_init_disk(g
, drive
);
3995 ide_proc_register_driver(drive
, &idetape_driver
);
3997 kref_init(&tape
->kref
);
3999 tape
->drive
= drive
;
4000 tape
->driver
= &idetape_driver
;
4003 g
->private_data
= &tape
->driver
;
4005 drive
->driver_data
= tape
;
4007 mutex_lock(&idetape_ref_mutex
);
4008 for (minor
= 0; idetape_devs
[minor
]; minor
++)
4010 idetape_devs
[minor
] = tape
;
4011 mutex_unlock(&idetape_ref_mutex
);
4013 idetape_setup(drive
, tape
, minor
);
4015 device_create(idetape_sysfs_class
, &drive
->gendev
,
4016 MKDEV(IDETAPE_MAJOR
, minor
), "%s", tape
->name
);
4017 device_create(idetape_sysfs_class
, &drive
->gendev
,
4018 MKDEV(IDETAPE_MAJOR
, minor
+ 128), "n%s", tape
->name
);
4020 g
->fops
= &idetape_block_ops
;
4021 ide_register_region(g
);
4031 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
4032 MODULE_LICENSE("GPL");
4034 static void __exit
idetape_exit (void)
4036 driver_unregister(&idetape_driver
.gen_driver
);
4037 class_destroy(idetape_sysfs_class
);
4038 unregister_chrdev(IDETAPE_MAJOR
, "ht");
4041 static int __init
idetape_init(void)
4044 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
4045 if (IS_ERR(idetape_sysfs_class
)) {
4046 idetape_sysfs_class
= NULL
;
4047 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
4052 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
4053 printk(KERN_ERR
"ide-tape: Failed to register character device interface\n");
4055 goto out_free_class
;
4058 error
= driver_register(&idetape_driver
.gen_driver
);
4060 goto out_free_driver
;
4065 driver_unregister(&idetape_driver
.gen_driver
);
4067 class_destroy(idetape_sysfs_class
);
4072 MODULE_ALIAS("ide:*m-tape*");
4073 module_init(idetape_init
);
4074 module_exit(idetape_exit
);
4075 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);