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>
40 #include <asm/byteorder.h>
42 #include <asm/uaccess.h>
44 #include <asm/unaligned.h>
49 typedef struct os_partition_s
{
53 __u32 first_frame_addr
;
54 __u32 last_frame_addr
;
61 typedef struct os_dat_entry_s
{
71 #define OS_DAT_FLAGS_DATA (0xc)
72 #define OS_DAT_FLAGS_MARK (0x1)
74 typedef struct os_dat_s
{
79 os_dat_entry_t dat_list
[16];
82 #include <linux/mtio.h>
84 /**************************** Tunable parameters *****************************/
88 * Pipelined mode parameters.
90 * We try to use the minimum number of stages which is enough to
91 * keep the tape constantly streaming. To accomplish that, we implement
92 * a feedback loop around the maximum number of stages:
94 * We start from MIN maximum stages (we will not even use MIN stages
95 * if we don't need them), increment it by RATE*(MAX-MIN)
96 * whenever we sense that the pipeline is empty, until we reach
97 * the optimum value or until we reach MAX.
99 * Setting the following parameter to 0 is illegal: the pipelined mode
100 * cannot be disabled (calculate_speeds() divides by tape->max_stages.)
102 #define IDETAPE_MIN_PIPELINE_STAGES 1
103 #define IDETAPE_MAX_PIPELINE_STAGES 400
104 #define IDETAPE_INCREASE_STAGES_RATE 20
107 * The following are used to debug the driver:
109 * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control.
111 * Setting them to 0 will restore normal operation mode:
113 * 1. Disable logging normal successful operations.
114 * 2. Disable self-sanity checks.
115 * 3. Errors will still be logged, of course.
117 * All the #if DEBUG code will be removed some day, when the driver
118 * is verified to be stable enough. This will make it much more
121 #define IDETAPE_DEBUG_LOG 0
124 * After each failed packet command we issue a request sense command
125 * and retry the packet command IDETAPE_MAX_PC_RETRIES times.
127 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
129 #define IDETAPE_MAX_PC_RETRIES 3
132 * With each packet command, we allocate a buffer of
133 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
134 * commands (Not for READ/WRITE commands).
136 #define IDETAPE_PC_BUFFER_SIZE 256
139 * In various places in the driver, we need to allocate storage
140 * for packet commands and requests, which will remain valid while
141 * we leave the driver to wait for an interrupt or a timeout event.
143 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
146 * Some drives (for example, Seagate STT3401A Travan) require a very long
147 * timeout, because they don't return an interrupt or clear their busy bit
148 * until after the command completes (even retension commands).
150 #define IDETAPE_WAIT_CMD (900*HZ)
153 * The following parameter is used to select the point in the internal
154 * tape fifo in which we will start to refill the buffer. Decreasing
155 * the following parameter will improve the system's latency and
156 * interactive response, while using a high value might improve system
159 #define IDETAPE_FIFO_THRESHOLD 2
162 * DSC polling parameters.
164 * Polling for DSC (a single bit in the status register) is a very
165 * important function in ide-tape. There are two cases in which we
168 * 1. Before a read/write packet command, to ensure that we
169 * can transfer data from/to the tape's data buffers, without
170 * causing an actual media access. In case the tape is not
171 * ready yet, we take out our request from the device
172 * request queue, so that ide.c will service requests from
173 * the other device on the same interface meanwhile.
175 * 2. After the successful initialization of a "media access
176 * packet command", which is a command which can take a long
177 * time to complete (it can be several seconds or even an hour).
179 * Again, we postpone our request in the middle to free the bus
180 * for the other device. The polling frequency here should be
181 * lower than the read/write frequency since those media access
182 * commands are slow. We start from a "fast" frequency -
183 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
184 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
185 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
187 * We also set a timeout for the timer, in case something goes wrong.
188 * The timeout should be longer then the maximum execution time of a
195 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
196 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
197 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
198 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
199 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
200 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
201 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
203 /*************************** End of tunable parameters ***********************/
206 * Read/Write error simulation
208 #define SIMULATE_ERRORS 0
211 * For general magnetic tape device compatibility.
214 idetape_direction_none
,
215 idetape_direction_read
,
216 idetape_direction_write
217 } idetape_chrdev_direction_t
;
222 struct idetape_bh
*b_reqnext
;
227 * Our view of a packet command.
229 typedef struct idetape_packet_command_s
{
230 u8 c
[12]; /* Actual packet bytes */
231 int retries
; /* On each retry, we increment retries */
232 int error
; /* Error code */
233 int request_transfer
; /* Bytes to transfer */
234 int actually_transferred
; /* Bytes actually transferred */
235 int buffer_size
; /* Size of our data buffer */
236 struct idetape_bh
*bh
;
239 u8
*buffer
; /* Data buffer */
240 u8
*current_position
; /* Pointer into the above buffer */
241 ide_startstop_t (*callback
) (ide_drive_t
*); /* Called when this packet command is completed */
242 u8 pc_buffer
[IDETAPE_PC_BUFFER_SIZE
]; /* Temporary buffer */
243 unsigned long flags
; /* Status/Action bit flags: long for set_bit */
247 * Packet command flag bits.
249 /* Set when an error is considered normal - We won't retry */
251 /* 1 When polling for DSC on a media access command */
252 #define PC_WAIT_FOR_DSC 1
253 /* 1 when we prefer to use DMA if possible */
254 #define PC_DMA_RECOMMENDED 2
255 /* 1 while DMA in progress */
256 #define PC_DMA_IN_PROGRESS 3
257 /* 1 when encountered problem during DMA */
258 #define PC_DMA_ERROR 4
266 unsigned page_code
:6; /* Page code - Should be 0x30 */
267 unsigned reserved1_6
:1;
269 __u8 page_length
; /* Page Length - Should be 2 */
272 unsigned play32_5
:1;
273 unsigned reserved2_23
:2;
274 unsigned record32
:1;
275 unsigned record32_5
:1;
276 unsigned reserved2_6
:1;
278 } idetape_block_size_page_t
;
283 typedef struct idetape_stage_s
{
284 struct request rq
; /* The corresponding request */
285 struct idetape_bh
*bh
; /* The data buffers */
286 struct idetape_stage_s
*next
; /* Pointer to the next stage */
290 * Most of our global data which we need to save even as we leave the
291 * driver due to an interrupt or a timer event is stored in a variable
292 * of type idetape_tape_t, defined below.
294 typedef struct ide_tape_obj
{
296 ide_driver_t
*driver
;
297 struct gendisk
*disk
;
301 * Since a typical character device operation requires more
302 * than one packet command, we provide here enough memory
303 * for the maximum of interconnected packet commands.
304 * The packet commands are stored in the circular array pc_stack.
305 * pc_stack_index points to the last used entry, and warps around
306 * to the start when we get to the last array entry.
308 * pc points to the current processed packet command.
310 * failed_pc points to the last failed packet command, or contains
311 * NULL if we do not need to retry any packet command. This is
312 * required since an additional packet command is needed before the
313 * retry, to get detailed information on what went wrong.
315 /* Current packet command */
317 /* Last failed packet command */
318 idetape_pc_t
*failed_pc
;
319 /* Packet command stack */
320 idetape_pc_t pc_stack
[IDETAPE_PC_STACK
];
321 /* Next free packet command storage space */
323 struct request rq_stack
[IDETAPE_PC_STACK
];
324 /* We implement a circular array */
328 * DSC polling variables.
330 * While polling for DSC we use postponed_rq to postpone the
331 * current request so that ide.c will be able to service
332 * pending requests on the other device. Note that at most
333 * we will have only one DSC (usually data transfer) request
334 * in the device request queue. Additional requests can be
335 * queued in our internal pipeline, but they will be visible
336 * to ide.c only one at a time.
338 struct request
*postponed_rq
;
339 /* The time in which we started polling for DSC */
340 unsigned long dsc_polling_start
;
341 /* Timer used to poll for dsc */
342 struct timer_list dsc_timer
;
343 /* Read/Write dsc polling frequency */
344 unsigned long best_dsc_rw_frequency
;
345 /* The current polling frequency */
346 unsigned long dsc_polling_frequency
;
347 /* Maximum waiting time */
348 unsigned long dsc_timeout
;
351 * Read position information
355 unsigned int first_frame_position
;
356 unsigned int last_frame_position
;
357 unsigned int blocks_in_buffer
;
360 * Last error information
362 u8 sense_key
, asc
, ascq
;
365 * Character device operation
370 /* Current character device data transfer direction */
371 idetape_chrdev_direction_t chrdev_direction
;
376 /* Usually 512 or 1024 bytes */
377 unsigned short tape_block_size
;
380 /* Copy of the tape's Capabilities and Mechanical Page */
384 * Active data transfer request parameters.
386 * At most, there is only one ide-tape originated data transfer
387 * request in the device request queue. This allows ide.c to
388 * easily service requests from the other device when we
389 * postpone our active request. In the pipelined operation
390 * mode, we use our internal pipeline structure to hold
391 * more data requests.
393 * The data buffer size is chosen based on the tape's
396 /* Pointer to the request which is waiting in the device request queue */
397 struct request
*active_data_request
;
398 /* Data buffer size (chosen based on the tape's recommendation */
400 idetape_stage_t
*merge_stage
;
401 int merge_stage_size
;
402 struct idetape_bh
*bh
;
407 * Pipeline parameters.
409 * To accomplish non-pipelined mode, we simply set the following
410 * variables to zero (or NULL, where appropriate).
412 /* Number of currently used stages */
414 /* Number of pending stages */
415 int nr_pending_stages
;
416 /* We will not allocate more than this number of stages */
417 int max_stages
, min_pipeline
, max_pipeline
;
418 /* The first stage which will be removed from the pipeline */
419 idetape_stage_t
*first_stage
;
420 /* The currently active stage */
421 idetape_stage_t
*active_stage
;
422 /* Will be serviced after the currently active request */
423 idetape_stage_t
*next_stage
;
424 /* New requests will be added to the pipeline here */
425 idetape_stage_t
*last_stage
;
426 /* Optional free stage which we can use */
427 idetape_stage_t
*cache_stage
;
429 /* Wasted space in each stage */
432 /* Status/Action flags: long for set_bit */
434 /* protects the ide-tape queue */
438 * Measures average tape speed
440 unsigned long avg_time
;
446 char firmware_revision
[6];
447 int firmware_revision_num
;
449 /* the door is currently locked */
451 /* the tape hardware is write protected */
453 /* the tape is write protected (hardware or opened as read-only) */
457 * Limit the number of times a request can
458 * be postponed, to avoid an infinite postpone
461 /* request postpone count limit */
465 * Measures number of frames:
467 * 1. written/read to/from the driver pipeline (pipeline_head).
468 * 2. written/read to/from the tape buffers (idetape_bh).
469 * 3. written/read by the tape to/from the media (tape_head).
477 * Speed control at the tape buffers input/output
479 unsigned long insert_time
;
482 int max_insert_speed
;
483 int measure_insert_time
;
486 * Measure tape still time, in milliseconds
488 unsigned long tape_still_time_begin
;
492 * Speed regulation negative feedback loop
495 int pipeline_head_speed
;
496 int controlled_pipeline_head_speed
;
497 int uncontrolled_pipeline_head_speed
;
498 int controlled_last_pipeline_head
;
499 int uncontrolled_last_pipeline_head
;
500 unsigned long uncontrolled_pipeline_head_time
;
501 unsigned long controlled_pipeline_head_time
;
502 int controlled_previous_pipeline_head
;
503 int uncontrolled_previous_pipeline_head
;
504 unsigned long controlled_previous_head_time
;
505 unsigned long uncontrolled_previous_head_time
;
506 int restart_speed_control_req
;
509 * Debug_level determines amount of debugging output;
510 * can be changed using /proc/ide/hdx/settings
511 * 0 : almost no debugging output
512 * 1 : 0+output errors only
513 * 2 : 1+output all sensekey/asc
514 * 3 : 2+follow all chrdev related procedures
515 * 4 : 3+follow all procedures
516 * 5 : 4+include pc_stack rq_stack info
517 * 6 : 5+USE_COUNT updates
522 static DEFINE_MUTEX(idetape_ref_mutex
);
524 static struct class *idetape_sysfs_class
;
526 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
528 #define ide_tape_g(disk) \
529 container_of((disk)->private_data, struct ide_tape_obj, driver)
531 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
533 struct ide_tape_obj
*tape
= NULL
;
535 mutex_lock(&idetape_ref_mutex
);
536 tape
= ide_tape_g(disk
);
538 kref_get(&tape
->kref
);
539 mutex_unlock(&idetape_ref_mutex
);
543 static void ide_tape_release(struct kref
*);
545 static void ide_tape_put(struct ide_tape_obj
*tape
)
547 mutex_lock(&idetape_ref_mutex
);
548 kref_put(&tape
->kref
, ide_tape_release
);
549 mutex_unlock(&idetape_ref_mutex
);
555 #define DOOR_UNLOCKED 0
556 #define DOOR_LOCKED 1
557 #define DOOR_EXPLICITLY_LOCKED 2
560 * Tape flag bits values.
562 #define IDETAPE_IGNORE_DSC 0
563 #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
564 #define IDETAPE_BUSY 2 /* Device already opened */
565 #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
566 #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
567 #define IDETAPE_FILEMARK 5 /* Currently on a filemark */
568 #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
569 #define IDETAPE_READ_ERROR 7
570 #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
571 /* 0 = no tape is loaded, so we don't rewind after ejecting */
572 #define IDETAPE_MEDIUM_PRESENT 9
575 * Supported ATAPI tape drives packet commands
577 #define IDETAPE_TEST_UNIT_READY_CMD 0x00
578 #define IDETAPE_REWIND_CMD 0x01
579 #define IDETAPE_REQUEST_SENSE_CMD 0x03
580 #define IDETAPE_READ_CMD 0x08
581 #define IDETAPE_WRITE_CMD 0x0a
582 #define IDETAPE_WRITE_FILEMARK_CMD 0x10
583 #define IDETAPE_SPACE_CMD 0x11
584 #define IDETAPE_INQUIRY_CMD 0x12
585 #define IDETAPE_ERASE_CMD 0x19
586 #define IDETAPE_MODE_SENSE_CMD 0x1a
587 #define IDETAPE_MODE_SELECT_CMD 0x15
588 #define IDETAPE_LOAD_UNLOAD_CMD 0x1b
589 #define IDETAPE_PREVENT_CMD 0x1e
590 #define IDETAPE_LOCATE_CMD 0x2b
591 #define IDETAPE_READ_POSITION_CMD 0x34
592 #define IDETAPE_READ_BUFFER_CMD 0x3c
593 #define IDETAPE_SET_SPEED_CMD 0xbb
596 * Some defines for the READ BUFFER command
598 #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
601 * Some defines for the SPACE command
603 #define IDETAPE_SPACE_OVER_FILEMARK 1
604 #define IDETAPE_SPACE_TO_EOD 3
607 * Some defines for the LOAD UNLOAD command
609 #define IDETAPE_LU_LOAD_MASK 1
610 #define IDETAPE_LU_RETENSION_MASK 2
611 #define IDETAPE_LU_EOT_MASK 4
614 * Special requests for our block device strategy routine.
616 * In order to service a character device command, we add special
617 * requests to the tail of our block device request queue and wait
618 * for their completion.
622 REQ_IDETAPE_PC1
= (1 << 0), /* packet command (first stage) */
623 REQ_IDETAPE_PC2
= (1 << 1), /* packet command (second stage) */
624 REQ_IDETAPE_READ
= (1 << 2),
625 REQ_IDETAPE_WRITE
= (1 << 3),
626 REQ_IDETAPE_READ_BUFFER
= (1 << 4),
630 * Error codes which are returned in rq->errors to the higher part
633 #define IDETAPE_ERROR_GENERAL 101
634 #define IDETAPE_ERROR_FILEMARK 102
635 #define IDETAPE_ERROR_EOD 103
638 * The following is used to format the general configuration word of
639 * the ATAPI IDENTIFY DEVICE command.
641 struct idetape_id_gcw
{
642 unsigned packet_size
:2; /* Packet Size */
643 unsigned reserved234
:3; /* Reserved */
644 unsigned drq_type
:2; /* Command packet DRQ type */
645 unsigned removable
:1; /* Removable media */
646 unsigned device_type
:5; /* Device type */
647 unsigned reserved13
:1; /* Reserved */
648 unsigned protocol
:2; /* Protocol type */
652 * READ POSITION packet command - Data Format (From Table 6-57)
655 unsigned reserved0_10
:2; /* Reserved */
656 unsigned bpu
:1; /* Block Position Unknown */
657 unsigned reserved0_543
:3; /* Reserved */
658 unsigned eop
:1; /* End Of Partition */
659 unsigned bop
:1; /* Beginning Of Partition */
660 u8 partition
; /* Partition Number */
661 u8 reserved2
, reserved3
; /* Reserved */
662 u32 first_block
; /* First Block Location */
663 u32 last_block
; /* Last Block Location (Optional) */
664 u8 reserved12
; /* Reserved */
665 u8 blocks_in_buffer
[3]; /* Blocks In Buffer - (Optional) */
666 u32 bytes_in_buffer
; /* Bytes In Buffer (Optional) */
667 } idetape_read_position_result_t
;
670 * Follows structures which are related to the SELECT SENSE / MODE SENSE
671 * packet commands. Those packet commands are still not supported
674 #define IDETAPE_BLOCK_DESCRIPTOR 0
675 #define IDETAPE_CAPABILITIES_PAGE 0x2a
676 #define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */
677 #define IDETAPE_BLOCK_SIZE_PAGE 0x30
678 #define IDETAPE_BUFFER_FILLING_PAGE 0x33
681 * Mode Parameter Block Descriptor the MODE SENSE packet command
683 * Support for block descriptors is optional.
686 __u8 density_code
; /* Medium density code */
687 __u8 blocks
[3]; /* Number of blocks */
688 __u8 reserved4
; /* Reserved */
689 __u8 length
[3]; /* Block Length */
690 } idetape_parameter_block_descriptor_t
;
693 * The Data Compression Page, as returned by the MODE SENSE packet command.
696 unsigned page_code
:6; /* Page Code - Should be 0xf */
697 unsigned reserved0
:1; /* Reserved */
699 __u8 page_length
; /* Page Length - Should be 14 */
700 unsigned reserved2
:6; /* Reserved */
701 unsigned dcc
:1; /* Data Compression Capable */
702 unsigned dce
:1; /* Data Compression Enable */
703 unsigned reserved3
:5; /* Reserved */
704 unsigned red
:2; /* Report Exception on Decompression */
705 unsigned dde
:1; /* Data Decompression Enable */
706 __u32 ca
; /* Compression Algorithm */
707 __u32 da
; /* Decompression Algorithm */
708 __u8 reserved
[4]; /* Reserved */
709 } idetape_data_compression_page_t
;
712 * The Medium Partition Page, as returned by the MODE SENSE packet command.
715 unsigned page_code
:6; /* Page Code - Should be 0x11 */
716 unsigned reserved1_6
:1; /* Reserved */
718 __u8 page_length
; /* Page Length - Should be 6 */
719 __u8 map
; /* Maximum Additional Partitions - Should be 0 */
720 __u8 apd
; /* Additional Partitions Defined - Should be 0 */
721 unsigned reserved4_012
:3; /* Reserved */
722 unsigned psum
:2; /* Should be 0 */
723 unsigned idp
:1; /* Should be 0 */
724 unsigned sdp
:1; /* Should be 0 */
725 unsigned fdp
:1; /* Fixed Data Partitions */
726 __u8 mfr
; /* Medium Format Recognition */
727 __u8 reserved
[2]; /* Reserved */
728 } idetape_medium_partition_page_t
;
731 * Run time configurable parameters.
734 int dsc_rw_frequency
;
735 int dsc_media_access_frequency
;
740 * The variables below are used for the character device interface.
741 * Additional state variables are defined in our ide_drive_t structure.
743 static struct ide_tape_obj
* idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
745 #define ide_tape_f(file) ((file)->private_data)
747 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
749 struct ide_tape_obj
*tape
= NULL
;
751 mutex_lock(&idetape_ref_mutex
);
752 tape
= idetape_devs
[i
];
754 kref_get(&tape
->kref
);
755 mutex_unlock(&idetape_ref_mutex
);
760 * Function declarations
763 static int idetape_chrdev_release (struct inode
*inode
, struct file
*filp
);
764 static void idetape_write_release (ide_drive_t
*drive
, unsigned int minor
);
767 * Too bad. The drive wants to send us data which we are not ready to accept.
768 * Just throw it away.
770 static void idetape_discard_data (ide_drive_t
*drive
, unsigned int bcount
)
773 (void) HWIF(drive
)->INB(IDE_DATA_REG
);
776 static void idetape_input_buffers (ide_drive_t
*drive
, idetape_pc_t
*pc
, unsigned int bcount
)
778 struct idetape_bh
*bh
= pc
->bh
;
783 printk(KERN_ERR
"ide-tape: bh == NULL in "
784 "idetape_input_buffers\n");
785 idetape_discard_data(drive
, bcount
);
788 count
= min((unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)), bcount
);
789 HWIF(drive
)->atapi_input_bytes(drive
, bh
->b_data
+ atomic_read(&bh
->b_count
), count
);
791 atomic_add(count
, &bh
->b_count
);
792 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
795 atomic_set(&bh
->b_count
, 0);
801 static void idetape_output_buffers (ide_drive_t
*drive
, idetape_pc_t
*pc
, unsigned int bcount
)
803 struct idetape_bh
*bh
= pc
->bh
;
808 printk(KERN_ERR
"ide-tape: bh == NULL in "
809 "idetape_output_buffers\n");
812 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
813 HWIF(drive
)->atapi_output_bytes(drive
, pc
->b_data
, count
);
816 pc
->b_count
-= count
;
818 pc
->bh
= bh
= bh
->b_reqnext
;
820 pc
->b_data
= bh
->b_data
;
821 pc
->b_count
= atomic_read(&bh
->b_count
);
827 static void idetape_update_buffers (idetape_pc_t
*pc
)
829 struct idetape_bh
*bh
= pc
->bh
;
831 unsigned int bcount
= pc
->actually_transferred
;
833 if (test_bit(PC_WRITING
, &pc
->flags
))
837 printk(KERN_ERR
"ide-tape: bh == NULL in "
838 "idetape_update_buffers\n");
841 count
= min((unsigned int)bh
->b_size
, (unsigned int)bcount
);
842 atomic_set(&bh
->b_count
, count
);
843 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
851 * idetape_next_pc_storage returns a pointer to a place in which we can
852 * safely store a packet command, even though we intend to leave the
853 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
854 * commands is allocated at initialization time.
856 static idetape_pc_t
*idetape_next_pc_storage (ide_drive_t
*drive
)
858 idetape_tape_t
*tape
= drive
->driver_data
;
860 #if IDETAPE_DEBUG_LOG
861 if (tape
->debug_level
>= 5)
862 printk(KERN_INFO
"ide-tape: pc_stack_index=%d\n",
863 tape
->pc_stack_index
);
864 #endif /* IDETAPE_DEBUG_LOG */
865 if (tape
->pc_stack_index
== IDETAPE_PC_STACK
)
866 tape
->pc_stack_index
=0;
867 return (&tape
->pc_stack
[tape
->pc_stack_index
++]);
871 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
872 * Since we queue packet commands in the request queue, we need to
873 * allocate a request, along with the allocation of a packet command.
876 /**************************************************************
878 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
879 * followed later on by kfree(). -ml *
881 **************************************************************/
883 static struct request
*idetape_next_rq_storage (ide_drive_t
*drive
)
885 idetape_tape_t
*tape
= drive
->driver_data
;
887 #if IDETAPE_DEBUG_LOG
888 if (tape
->debug_level
>= 5)
889 printk(KERN_INFO
"ide-tape: rq_stack_index=%d\n",
890 tape
->rq_stack_index
);
891 #endif /* IDETAPE_DEBUG_LOG */
892 if (tape
->rq_stack_index
== IDETAPE_PC_STACK
)
893 tape
->rq_stack_index
=0;
894 return (&tape
->rq_stack
[tape
->rq_stack_index
++]);
898 * idetape_init_pc initializes a packet command.
900 static void idetape_init_pc (idetape_pc_t
*pc
)
902 memset(pc
->c
, 0, 12);
905 pc
->request_transfer
= 0;
906 pc
->buffer
= pc
->pc_buffer
;
907 pc
->buffer_size
= IDETAPE_PC_BUFFER_SIZE
;
913 * called on each failed packet command retry to analyze the request sense. We
914 * currently do not utilize this information.
916 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
918 idetape_tape_t
*tape
= drive
->driver_data
;
919 idetape_pc_t
*pc
= tape
->failed_pc
;
921 tape
->sense_key
= sense
[2] & 0xF;
922 tape
->asc
= sense
[12];
923 tape
->ascq
= sense
[13];
924 #if IDETAPE_DEBUG_LOG
926 * Without debugging, we only log an error if we decided to give up
929 if (tape
->debug_level
>= 1)
930 printk(KERN_INFO
"ide-tape: pc = %x, sense key = %x, "
931 "asc = %x, ascq = %x\n",
932 pc
->c
[0], tape
->sense_key
,
933 tape
->asc
, tape
->ascq
);
934 #endif /* IDETAPE_DEBUG_LOG */
936 /* Correct pc->actually_transferred by asking the tape. */
937 if (test_bit(PC_DMA_ERROR
, &pc
->flags
)) {
938 pc
->actually_transferred
= pc
->request_transfer
-
939 tape
->tape_block_size
*
940 ntohl(get_unaligned((u32
*)&sense
[3]));
941 idetape_update_buffers(pc
);
945 * If error was the result of a zero-length read or write command,
946 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
947 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
949 if ((pc
->c
[0] == IDETAPE_READ_CMD
|| pc
->c
[0] == IDETAPE_WRITE_CMD
)
951 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
952 if (tape
->sense_key
== 5) {
953 /* don't report an error, everything's ok */
955 /* don't retry read/write */
956 set_bit(PC_ABORT
, &pc
->flags
);
959 if (pc
->c
[0] == IDETAPE_READ_CMD
&& (sense
[2] & 0x80)) {
960 pc
->error
= IDETAPE_ERROR_FILEMARK
;
961 set_bit(PC_ABORT
, &pc
->flags
);
963 if (pc
->c
[0] == IDETAPE_WRITE_CMD
) {
964 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
965 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
966 pc
->error
= IDETAPE_ERROR_EOD
;
967 set_bit(PC_ABORT
, &pc
->flags
);
970 if (pc
->c
[0] == IDETAPE_READ_CMD
|| pc
->c
[0] == IDETAPE_WRITE_CMD
) {
971 if (tape
->sense_key
== 8) {
972 pc
->error
= IDETAPE_ERROR_EOD
;
973 set_bit(PC_ABORT
, &pc
->flags
);
975 if (!test_bit(PC_ABORT
, &pc
->flags
) &&
976 pc
->actually_transferred
)
977 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
982 * idetape_active_next_stage will declare the next stage as "active".
984 static void idetape_active_next_stage (ide_drive_t
*drive
)
986 idetape_tape_t
*tape
= drive
->driver_data
;
987 idetape_stage_t
*stage
= tape
->next_stage
;
988 struct request
*rq
= &stage
->rq
;
990 #if IDETAPE_DEBUG_LOG
991 if (tape
->debug_level
>= 4)
992 printk(KERN_INFO
"ide-tape: Reached idetape_active_next_stage\n");
993 #endif /* IDETAPE_DEBUG_LOG */
995 printk(KERN_ERR
"ide-tape: bug: Trying to activate a non existing stage\n");
999 rq
->rq_disk
= tape
->disk
;
1001 rq
->special
= (void *)stage
->bh
;
1002 tape
->active_data_request
= rq
;
1003 tape
->active_stage
= stage
;
1004 tape
->next_stage
= stage
->next
;
1008 * idetape_increase_max_pipeline_stages is a part of the feedback
1009 * loop which tries to find the optimum number of stages. In the
1010 * feedback loop, we are starting from a minimum maximum number of
1011 * stages, and if we sense that the pipeline is empty, we try to
1012 * increase it, until we reach the user compile time memory limit.
1014 static void idetape_increase_max_pipeline_stages (ide_drive_t
*drive
)
1016 idetape_tape_t
*tape
= drive
->driver_data
;
1017 int increase
= (tape
->max_pipeline
- tape
->min_pipeline
) / 10;
1019 #if IDETAPE_DEBUG_LOG
1020 if (tape
->debug_level
>= 4)
1021 printk (KERN_INFO
"ide-tape: Reached idetape_increase_max_pipeline_stages\n");
1022 #endif /* IDETAPE_DEBUG_LOG */
1024 tape
->max_stages
+= max(increase
, 1);
1025 tape
->max_stages
= max(tape
->max_stages
, tape
->min_pipeline
);
1026 tape
->max_stages
= min(tape
->max_stages
, tape
->max_pipeline
);
1030 * idetape_kfree_stage calls kfree to completely free a stage, along with
1031 * its related buffers.
1033 static void __idetape_kfree_stage (idetape_stage_t
*stage
)
1035 struct idetape_bh
*prev_bh
, *bh
= stage
->bh
;
1038 while (bh
!= NULL
) {
1039 if (bh
->b_data
!= NULL
) {
1040 size
= (int) bh
->b_size
;
1042 free_page((unsigned long) bh
->b_data
);
1044 bh
->b_data
+= PAGE_SIZE
;
1054 static void idetape_kfree_stage (idetape_tape_t
*tape
, idetape_stage_t
*stage
)
1056 __idetape_kfree_stage(stage
);
1060 * idetape_remove_stage_head removes tape->first_stage from the pipeline.
1061 * The caller should avoid race conditions.
1063 static void idetape_remove_stage_head (ide_drive_t
*drive
)
1065 idetape_tape_t
*tape
= drive
->driver_data
;
1066 idetape_stage_t
*stage
;
1068 #if IDETAPE_DEBUG_LOG
1069 if (tape
->debug_level
>= 4)
1070 printk(KERN_INFO
"ide-tape: Reached idetape_remove_stage_head\n");
1071 #endif /* IDETAPE_DEBUG_LOG */
1072 if (tape
->first_stage
== NULL
) {
1073 printk(KERN_ERR
"ide-tape: bug: tape->first_stage is NULL\n");
1076 if (tape
->active_stage
== tape
->first_stage
) {
1077 printk(KERN_ERR
"ide-tape: bug: Trying to free our active pipeline stage\n");
1080 stage
= tape
->first_stage
;
1081 tape
->first_stage
= stage
->next
;
1082 idetape_kfree_stage(tape
, stage
);
1084 if (tape
->first_stage
== NULL
) {
1085 tape
->last_stage
= NULL
;
1086 if (tape
->next_stage
!= NULL
)
1087 printk(KERN_ERR
"ide-tape: bug: tape->next_stage != NULL\n");
1088 if (tape
->nr_stages
)
1089 printk(KERN_ERR
"ide-tape: bug: nr_stages should be 0 now\n");
1094 * This will free all the pipeline stages starting from new_last_stage->next
1095 * to the end of the list, and point tape->last_stage to new_last_stage.
1097 static void idetape_abort_pipeline(ide_drive_t
*drive
,
1098 idetape_stage_t
*new_last_stage
)
1100 idetape_tape_t
*tape
= drive
->driver_data
;
1101 idetape_stage_t
*stage
= new_last_stage
->next
;
1102 idetape_stage_t
*nstage
;
1104 #if IDETAPE_DEBUG_LOG
1105 if (tape
->debug_level
>= 4)
1106 printk(KERN_INFO
"ide-tape: %s: idetape_abort_pipeline called\n", tape
->name
);
1109 nstage
= stage
->next
;
1110 idetape_kfree_stage(tape
, stage
);
1112 --tape
->nr_pending_stages
;
1116 new_last_stage
->next
= NULL
;
1117 tape
->last_stage
= new_last_stage
;
1118 tape
->next_stage
= NULL
;
1122 * idetape_end_request is used to finish servicing a request, and to
1123 * insert a pending pipeline request into the main device queue.
1125 static int idetape_end_request(ide_drive_t
*drive
, int uptodate
, int nr_sects
)
1127 struct request
*rq
= HWGROUP(drive
)->rq
;
1128 idetape_tape_t
*tape
= drive
->driver_data
;
1129 unsigned long flags
;
1131 int remove_stage
= 0;
1132 idetape_stage_t
*active_stage
;
1134 #if IDETAPE_DEBUG_LOG
1135 if (tape
->debug_level
>= 4)
1136 printk(KERN_INFO
"ide-tape: Reached idetape_end_request\n");
1137 #endif /* IDETAPE_DEBUG_LOG */
1140 case 0: error
= IDETAPE_ERROR_GENERAL
; break;
1141 case 1: error
= 0; break;
1142 default: error
= uptodate
;
1146 tape
->failed_pc
= NULL
;
1148 if (!blk_special_request(rq
)) {
1149 ide_end_request(drive
, uptodate
, nr_sects
);
1153 spin_lock_irqsave(&tape
->spinlock
, flags
);
1155 /* The request was a pipelined data transfer request */
1156 if (tape
->active_data_request
== rq
) {
1157 active_stage
= tape
->active_stage
;
1158 tape
->active_stage
= NULL
;
1159 tape
->active_data_request
= NULL
;
1160 tape
->nr_pending_stages
--;
1161 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1164 set_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
1165 if (error
== IDETAPE_ERROR_EOD
)
1166 idetape_abort_pipeline(drive
, active_stage
);
1168 } else if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1169 if (error
== IDETAPE_ERROR_EOD
) {
1170 set_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
1171 idetape_abort_pipeline(drive
, active_stage
);
1174 if (tape
->next_stage
!= NULL
) {
1175 idetape_active_next_stage(drive
);
1178 * Insert the next request into the request queue.
1180 (void) ide_do_drive_cmd(drive
, tape
->active_data_request
, ide_end
);
1181 } else if (!error
) {
1182 idetape_increase_max_pipeline_stages(drive
);
1185 ide_end_drive_cmd(drive
, 0, 0);
1186 // blkdev_dequeue_request(rq);
1187 // drive->rq = NULL;
1188 // end_that_request_last(rq);
1191 idetape_remove_stage_head(drive
);
1192 if (tape
->active_data_request
== NULL
)
1193 clear_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
1194 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
1198 static ide_startstop_t
idetape_request_sense_callback (ide_drive_t
*drive
)
1200 idetape_tape_t
*tape
= drive
->driver_data
;
1202 #if IDETAPE_DEBUG_LOG
1203 if (tape
->debug_level
>= 4)
1204 printk(KERN_INFO
"ide-tape: Reached idetape_request_sense_callback\n");
1205 #endif /* IDETAPE_DEBUG_LOG */
1206 if (!tape
->pc
->error
) {
1207 idetape_analyze_error(drive
, tape
->pc
->buffer
);
1208 idetape_end_request(drive
, 1, 0);
1210 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
1211 idetape_end_request(drive
, 0, 0);
1216 static void idetape_create_request_sense_cmd (idetape_pc_t
*pc
)
1218 idetape_init_pc(pc
);
1219 pc
->c
[0] = IDETAPE_REQUEST_SENSE_CMD
;
1221 pc
->request_transfer
= 20;
1222 pc
->callback
= &idetape_request_sense_callback
;
1225 static void idetape_init_rq(struct request
*rq
, u8 cmd
)
1227 memset(rq
, 0, sizeof(*rq
));
1228 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1233 * idetape_queue_pc_head generates a new packet command request in front
1234 * of the request queue, before the current request, so that it will be
1235 * processed immediately, on the next pass through the driver.
1237 * idetape_queue_pc_head is called from the request handling part of
1238 * the driver (the "bottom" part). Safe storage for the request should
1239 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
1240 * before calling idetape_queue_pc_head.
1242 * Memory for those requests is pre-allocated at initialization time, and
1243 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
1244 * space for the maximum possible number of inter-dependent packet commands.
1246 * The higher level of the driver - The ioctl handler and the character
1247 * device handling functions should queue request to the lower level part
1248 * and wait for their completion using idetape_queue_pc_tail or
1249 * idetape_queue_rw_tail.
1251 static void idetape_queue_pc_head (ide_drive_t
*drive
, idetape_pc_t
*pc
,struct request
*rq
)
1253 struct ide_tape_obj
*tape
= drive
->driver_data
;
1255 idetape_init_rq(rq
, REQ_IDETAPE_PC1
);
1256 rq
->buffer
= (char *) pc
;
1257 rq
->rq_disk
= tape
->disk
;
1258 (void) ide_do_drive_cmd(drive
, rq
, ide_preempt
);
1262 * idetape_retry_pc is called when an error was detected during the
1263 * last packet command. We queue a request sense packet command in
1264 * the head of the request list.
1266 static ide_startstop_t
idetape_retry_pc (ide_drive_t
*drive
)
1268 idetape_tape_t
*tape
= drive
->driver_data
;
1272 (void)drive
->hwif
->INB(IDE_ERROR_REG
);
1273 pc
= idetape_next_pc_storage(drive
);
1274 rq
= idetape_next_rq_storage(drive
);
1275 idetape_create_request_sense_cmd(pc
);
1276 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
1277 idetape_queue_pc_head(drive
, pc
, rq
);
1282 * idetape_postpone_request postpones the current request so that
1283 * ide.c will be able to service requests from another device on
1284 * the same hwgroup while we are polling for DSC.
1286 static void idetape_postpone_request (ide_drive_t
*drive
)
1288 idetape_tape_t
*tape
= drive
->driver_data
;
1290 #if IDETAPE_DEBUG_LOG
1291 if (tape
->debug_level
>= 4)
1292 printk(KERN_INFO
"ide-tape: idetape_postpone_request\n");
1294 tape
->postponed_rq
= HWGROUP(drive
)->rq
;
1295 ide_stall_queue(drive
, tape
->dsc_polling_frequency
);
1299 * idetape_pc_intr is the usual interrupt handler which will be called
1300 * during a packet command. We will transfer some of the data (as
1301 * requested by the drive) and will re-point interrupt handler to us.
1302 * When data transfer is finished, we will act according to the
1303 * algorithm described before idetape_issue_packet_command.
1306 static ide_startstop_t
idetape_pc_intr (ide_drive_t
*drive
)
1308 ide_hwif_t
*hwif
= drive
->hwif
;
1309 idetape_tape_t
*tape
= drive
->driver_data
;
1310 idetape_pc_t
*pc
= tape
->pc
;
1313 static int error_sim_count
= 0;
1318 #if IDETAPE_DEBUG_LOG
1319 if (tape
->debug_level
>= 4)
1320 printk(KERN_INFO
"ide-tape: Reached idetape_pc_intr "
1321 "interrupt handler\n");
1322 #endif /* IDETAPE_DEBUG_LOG */
1324 /* Clear the interrupt */
1325 stat
= hwif
->INB(IDE_STATUS_REG
);
1327 if (test_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
)) {
1328 if (hwif
->ide_dma_end(drive
) || (stat
& ERR_STAT
)) {
1330 * A DMA error is sometimes expected. For example,
1331 * if the tape is crossing a filemark during a
1332 * READ command, it will issue an irq and position
1333 * itself before the filemark, so that only a partial
1334 * data transfer will occur (which causes the DMA
1335 * error). In that case, we will later ask the tape
1336 * how much bytes of the original request were
1337 * actually transferred (we can't receive that
1338 * information from the DMA engine on most chipsets).
1342 * On the contrary, a DMA error is never expected;
1343 * it usually indicates a hardware error or abort.
1344 * If the tape crosses a filemark during a READ
1345 * command, it will issue an irq and position itself
1346 * after the filemark (not before). Only a partial
1347 * data transfer will occur, but no DMA error.
1350 set_bit(PC_DMA_ERROR
, &pc
->flags
);
1352 pc
->actually_transferred
= pc
->request_transfer
;
1353 idetape_update_buffers(pc
);
1355 #if IDETAPE_DEBUG_LOG
1356 if (tape
->debug_level
>= 4)
1357 printk(KERN_INFO
"ide-tape: DMA finished\n");
1358 #endif /* IDETAPE_DEBUG_LOG */
1361 /* No more interrupts */
1362 if ((stat
& DRQ_STAT
) == 0) {
1363 #if IDETAPE_DEBUG_LOG
1364 if (tape
->debug_level
>= 2)
1365 printk(KERN_INFO
"ide-tape: Packet command completed, %d bytes transferred\n", pc
->actually_transferred
);
1366 #endif /* IDETAPE_DEBUG_LOG */
1367 clear_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
);
1372 if ((pc
->c
[0] == IDETAPE_WRITE_CMD
||
1373 pc
->c
[0] == IDETAPE_READ_CMD
) &&
1374 (++error_sim_count
% 100) == 0) {
1375 printk(KERN_INFO
"ide-tape: %s: simulating error\n",
1380 if ((stat
& ERR_STAT
) && pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
)
1382 if ((stat
& ERR_STAT
) || test_bit(PC_DMA_ERROR
, &pc
->flags
)) {
1383 /* Error detected */
1384 #if IDETAPE_DEBUG_LOG
1385 if (tape
->debug_level
>= 1)
1386 printk(KERN_INFO
"ide-tape: %s: I/O error\n",
1388 #endif /* IDETAPE_DEBUG_LOG */
1389 if (pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
) {
1390 printk(KERN_ERR
"ide-tape: I/O error in request sense command\n");
1391 return ide_do_reset(drive
);
1393 #if IDETAPE_DEBUG_LOG
1394 if (tape
->debug_level
>= 1)
1395 printk(KERN_INFO
"ide-tape: [cmd %x]: check condition\n", pc
->c
[0]);
1397 /* Retry operation */
1398 return idetape_retry_pc(drive
);
1401 if (test_bit(PC_WAIT_FOR_DSC
, &pc
->flags
) &&
1402 (stat
& SEEK_STAT
) == 0) {
1403 /* Media access command */
1404 tape
->dsc_polling_start
= jiffies
;
1405 tape
->dsc_polling_frequency
= IDETAPE_DSC_MA_FAST
;
1406 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
1407 /* Allow ide.c to handle other requests */
1408 idetape_postpone_request(drive
);
1411 if (tape
->failed_pc
== pc
)
1412 tape
->failed_pc
= NULL
;
1413 /* Command finished - Call the callback function */
1414 return pc
->callback(drive
);
1416 if (test_and_clear_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
)) {
1417 printk(KERN_ERR
"ide-tape: The tape wants to issue more "
1418 "interrupts in DMA mode\n");
1419 printk(KERN_ERR
"ide-tape: DMA disabled, reverting to PIO\n");
1421 return ide_do_reset(drive
);
1423 /* Get the number of bytes to transfer on this interrupt. */
1424 bcount
= (hwif
->INB(IDE_BCOUNTH_REG
) << 8) |
1425 hwif
->INB(IDE_BCOUNTL_REG
);
1427 ireason
= hwif
->INB(IDE_IREASON_REG
);
1430 printk(KERN_ERR
"ide-tape: CoD != 0 in idetape_pc_intr\n");
1431 return ide_do_reset(drive
);
1433 if (((ireason
& IO
) == IO
) == test_bit(PC_WRITING
, &pc
->flags
)) {
1434 /* Hopefully, we will never get here */
1435 printk(KERN_ERR
"ide-tape: We wanted to %s, ",
1436 (ireason
& IO
) ? "Write" : "Read");
1437 printk(KERN_ERR
"ide-tape: but the tape wants us to %s !\n",
1438 (ireason
& IO
) ? "Read" : "Write");
1439 return ide_do_reset(drive
);
1441 if (!test_bit(PC_WRITING
, &pc
->flags
)) {
1442 /* Reading - Check that we have enough space */
1443 temp
= pc
->actually_transferred
+ bcount
;
1444 if (temp
> pc
->request_transfer
) {
1445 if (temp
> pc
->buffer_size
) {
1446 printk(KERN_ERR
"ide-tape: The tape wants to send us more data than expected - discarding data\n");
1447 idetape_discard_data(drive
, bcount
);
1448 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1451 #if IDETAPE_DEBUG_LOG
1452 if (tape
->debug_level
>= 2)
1453 printk(KERN_NOTICE
"ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
1454 #endif /* IDETAPE_DEBUG_LOG */
1457 if (test_bit(PC_WRITING
, &pc
->flags
)) {
1459 idetape_output_buffers(drive
, pc
, bcount
);
1461 /* Write the current buffer */
1462 hwif
->atapi_output_bytes(drive
, pc
->current_position
,
1466 idetape_input_buffers(drive
, pc
, bcount
);
1468 /* Read the current buffer */
1469 hwif
->atapi_input_bytes(drive
, pc
->current_position
,
1472 /* Update the current position */
1473 pc
->actually_transferred
+= bcount
;
1474 pc
->current_position
+= bcount
;
1475 #if IDETAPE_DEBUG_LOG
1476 if (tape
->debug_level
>= 2)
1477 printk(KERN_INFO
"ide-tape: [cmd %x] transferred %d bytes "
1478 "on that interrupt\n", pc
->c
[0], bcount
);
1480 /* And set the interrupt handler again */
1481 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1486 * Packet Command Interface
1488 * The current Packet Command is available in tape->pc, and will not
1489 * change until we finish handling it. Each packet command is associated
1490 * with a callback function that will be called when the command is
1493 * The handling will be done in three stages:
1495 * 1. idetape_issue_packet_command will send the packet command to the
1496 * drive, and will set the interrupt handler to idetape_pc_intr.
1498 * 2. On each interrupt, idetape_pc_intr will be called. This step
1499 * will be repeated until the device signals us that no more
1500 * interrupts will be issued.
1502 * 3. ATAPI Tape media access commands have immediate status with a
1503 * delayed process. In case of a successful initiation of a
1504 * media access packet command, the DSC bit will be set when the
1505 * actual execution of the command is finished.
1506 * Since the tape drive will not issue an interrupt, we have to
1507 * poll for this event. In this case, we define the request as
1508 * "low priority request" by setting rq_status to
1509 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
1512 * ide.c will then give higher priority to requests which
1513 * originate from the other device, until will change rq_status
1516 * 4. When the packet command is finished, it will be checked for errors.
1518 * 5. In case an error was found, we queue a request sense packet
1519 * command in front of the request queue and retry the operation
1520 * up to IDETAPE_MAX_PC_RETRIES times.
1522 * 6. In case no error was found, or we decided to give up and not
1523 * to retry again, the callback function will be called and then
1524 * we will handle the next request.
1527 static ide_startstop_t
idetape_transfer_pc(ide_drive_t
*drive
)
1529 ide_hwif_t
*hwif
= drive
->hwif
;
1530 idetape_tape_t
*tape
= drive
->driver_data
;
1531 idetape_pc_t
*pc
= tape
->pc
;
1533 ide_startstop_t startstop
;
1536 if (ide_wait_stat(&startstop
,drive
,DRQ_STAT
,BUSY_STAT
,WAIT_READY
)) {
1537 printk(KERN_ERR
"ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
1540 ireason
= hwif
->INB(IDE_IREASON_REG
);
1541 while (retries
-- && ((ireason
& CD
) == 0 || (ireason
& IO
))) {
1542 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while issuing "
1543 "a packet command, retrying\n");
1545 ireason
= hwif
->INB(IDE_IREASON_REG
);
1547 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while "
1548 "issuing a packet command, ignoring\n");
1553 if ((ireason
& CD
) == 0 || (ireason
& IO
)) {
1554 printk(KERN_ERR
"ide-tape: (IO,CoD) != (0,1) while issuing "
1555 "a packet command\n");
1556 return ide_do_reset(drive
);
1558 /* Set the interrupt routine */
1559 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1560 #ifdef CONFIG_BLK_DEV_IDEDMA
1561 /* Begin DMA, if necessary */
1562 if (test_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
))
1563 hwif
->dma_start(drive
);
1565 /* Send the actual packet */
1566 HWIF(drive
)->atapi_output_bytes(drive
, pc
->c
, 12);
1570 static ide_startstop_t
idetape_issue_packet_command (ide_drive_t
*drive
, idetape_pc_t
*pc
)
1572 ide_hwif_t
*hwif
= drive
->hwif
;
1573 idetape_tape_t
*tape
= drive
->driver_data
;
1577 if (tape
->pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
&&
1578 pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
) {
1579 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
1580 "Two request sense in serial were issued\n");
1583 if (tape
->failed_pc
== NULL
&& pc
->c
[0] != IDETAPE_REQUEST_SENSE_CMD
)
1584 tape
->failed_pc
= pc
;
1585 /* Set the current packet command */
1588 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
1589 test_bit(PC_ABORT
, &pc
->flags
)) {
1591 * We will "abort" retrying a packet command in case
1592 * a legitimate error code was received (crossing a
1593 * filemark, or end of the media, for example).
1595 if (!test_bit(PC_ABORT
, &pc
->flags
)) {
1596 if (!(pc
->c
[0] == IDETAPE_TEST_UNIT_READY_CMD
&&
1597 tape
->sense_key
== 2 && tape
->asc
== 4 &&
1598 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
1599 printk(KERN_ERR
"ide-tape: %s: I/O error, "
1600 "pc = %2x, key = %2x, "
1601 "asc = %2x, ascq = %2x\n",
1602 tape
->name
, pc
->c
[0],
1603 tape
->sense_key
, tape
->asc
,
1607 pc
->error
= IDETAPE_ERROR_GENERAL
;
1609 tape
->failed_pc
= NULL
;
1610 return pc
->callback(drive
);
1612 #if IDETAPE_DEBUG_LOG
1613 if (tape
->debug_level
>= 2)
1614 printk(KERN_INFO
"ide-tape: Retry number - %d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
1615 #endif /* IDETAPE_DEBUG_LOG */
1618 /* We haven't transferred any data yet */
1619 pc
->actually_transferred
= 0;
1620 pc
->current_position
= pc
->buffer
;
1621 /* Request to transfer the entire buffer at once */
1622 bcount
= pc
->request_transfer
;
1624 if (test_and_clear_bit(PC_DMA_ERROR
, &pc
->flags
)) {
1625 printk(KERN_WARNING
"ide-tape: DMA disabled, "
1626 "reverting to PIO\n");
1629 if (test_bit(PC_DMA_RECOMMENDED
, &pc
->flags
) && drive
->using_dma
)
1630 dma_ok
= !hwif
->dma_setup(drive
);
1632 ide_pktcmd_tf_load(drive
, IDE_TFLAG_NO_SELECT_MASK
|
1633 IDE_TFLAG_OUT_DEVICE
, bcount
, dma_ok
);
1635 if (dma_ok
) /* Will begin DMA later */
1636 set_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
);
1637 if (test_bit(IDETAPE_DRQ_INTERRUPT
, &tape
->flags
)) {
1638 ide_execute_command(drive
, WIN_PACKETCMD
, &idetape_transfer_pc
,
1639 IDETAPE_WAIT_CMD
, NULL
);
1642 hwif
->OUTB(WIN_PACKETCMD
, IDE_COMMAND_REG
);
1643 return idetape_transfer_pc(drive
);
1648 * General packet command callback function.
1650 static ide_startstop_t
idetape_pc_callback (ide_drive_t
*drive
)
1652 idetape_tape_t
*tape
= drive
->driver_data
;
1654 #if IDETAPE_DEBUG_LOG
1655 if (tape
->debug_level
>= 4)
1656 printk(KERN_INFO
"ide-tape: Reached idetape_pc_callback\n");
1657 #endif /* IDETAPE_DEBUG_LOG */
1659 idetape_end_request(drive
, tape
->pc
->error
? 0 : 1, 0);
1664 * A mode sense command is used to "sense" tape parameters.
1666 static void idetape_create_mode_sense_cmd (idetape_pc_t
*pc
, u8 page_code
)
1668 idetape_init_pc(pc
);
1669 pc
->c
[0] = IDETAPE_MODE_SENSE_CMD
;
1670 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
1671 pc
->c
[1] = 8; /* DBD = 1 - Don't return block descriptors */
1672 pc
->c
[2] = page_code
;
1674 * Changed pc->c[3] to 0 (255 will at best return unused info).
1676 * For SCSI this byte is defined as subpage instead of high byte
1677 * of length and some IDE drives seem to interpret it this way
1678 * and return an error when 255 is used.
1681 pc
->c
[4] = 255; /* (We will just discard data in that case) */
1682 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
1683 pc
->request_transfer
= 12;
1684 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
1685 pc
->request_transfer
= 24;
1687 pc
->request_transfer
= 50;
1688 pc
->callback
= &idetape_pc_callback
;
1691 static void calculate_speeds(ide_drive_t
*drive
)
1693 idetape_tape_t
*tape
= drive
->driver_data
;
1694 int full
= 125, empty
= 75;
1696 if (time_after(jiffies
, tape
->controlled_pipeline_head_time
+ 120 * HZ
)) {
1697 tape
->controlled_previous_pipeline_head
= tape
->controlled_last_pipeline_head
;
1698 tape
->controlled_previous_head_time
= tape
->controlled_pipeline_head_time
;
1699 tape
->controlled_last_pipeline_head
= tape
->pipeline_head
;
1700 tape
->controlled_pipeline_head_time
= jiffies
;
1702 if (time_after(jiffies
, tape
->controlled_pipeline_head_time
+ 60 * HZ
))
1703 tape
->controlled_pipeline_head_speed
= (tape
->pipeline_head
- tape
->controlled_last_pipeline_head
) * 32 * HZ
/ (jiffies
- tape
->controlled_pipeline_head_time
);
1704 else if (time_after(jiffies
, tape
->controlled_previous_head_time
))
1705 tape
->controlled_pipeline_head_speed
= (tape
->pipeline_head
- tape
->controlled_previous_pipeline_head
) * 32 * HZ
/ (jiffies
- tape
->controlled_previous_head_time
);
1707 if (tape
->nr_pending_stages
< tape
->max_stages
/*- 1 */) {
1708 /* -1 for read mode error recovery */
1709 if (time_after(jiffies
, tape
->uncontrolled_previous_head_time
+ 10 * HZ
)) {
1710 tape
->uncontrolled_pipeline_head_time
= jiffies
;
1711 tape
->uncontrolled_pipeline_head_speed
= (tape
->pipeline_head
- tape
->uncontrolled_previous_pipeline_head
) * 32 * HZ
/ (jiffies
- tape
->uncontrolled_previous_head_time
);
1714 tape
->uncontrolled_previous_head_time
= jiffies
;
1715 tape
->uncontrolled_previous_pipeline_head
= tape
->pipeline_head
;
1716 if (time_after(jiffies
, tape
->uncontrolled_pipeline_head_time
+ 30 * HZ
)) {
1717 tape
->uncontrolled_pipeline_head_time
= jiffies
;
1720 tape
->pipeline_head_speed
= max(tape
->uncontrolled_pipeline_head_speed
, tape
->controlled_pipeline_head_speed
);
1721 if (tape
->speed_control
== 0) {
1722 tape
->max_insert_speed
= 5000;
1723 } else if (tape
->speed_control
== 1) {
1724 if (tape
->nr_pending_stages
>= tape
->max_stages
/ 2)
1725 tape
->max_insert_speed
= tape
->pipeline_head_speed
+
1726 (1100 - tape
->pipeline_head_speed
) * 2 * (tape
->nr_pending_stages
- tape
->max_stages
/ 2) / tape
->max_stages
;
1728 tape
->max_insert_speed
= 500 +
1729 (tape
->pipeline_head_speed
- 500) * 2 * tape
->nr_pending_stages
/ tape
->max_stages
;
1730 if (tape
->nr_pending_stages
>= tape
->max_stages
* 99 / 100)
1731 tape
->max_insert_speed
= 5000;
1732 } else if (tape
->speed_control
== 2) {
1733 tape
->max_insert_speed
= tape
->pipeline_head_speed
* empty
/ 100 +
1734 (tape
->pipeline_head_speed
* full
/ 100 - tape
->pipeline_head_speed
* empty
/ 100) * tape
->nr_pending_stages
/ tape
->max_stages
;
1736 tape
->max_insert_speed
= tape
->speed_control
;
1737 tape
->max_insert_speed
= max(tape
->max_insert_speed
, 500);
1740 static ide_startstop_t
idetape_media_access_finished (ide_drive_t
*drive
)
1742 idetape_tape_t
*tape
= drive
->driver_data
;
1743 idetape_pc_t
*pc
= tape
->pc
;
1746 stat
= drive
->hwif
->INB(IDE_STATUS_REG
);
1747 if (stat
& SEEK_STAT
) {
1748 if (stat
& ERR_STAT
) {
1749 /* Error detected */
1750 if (pc
->c
[0] != IDETAPE_TEST_UNIT_READY_CMD
)
1751 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
1753 /* Retry operation */
1754 return idetape_retry_pc(drive
);
1757 if (tape
->failed_pc
== pc
)
1758 tape
->failed_pc
= NULL
;
1760 pc
->error
= IDETAPE_ERROR_GENERAL
;
1761 tape
->failed_pc
= NULL
;
1763 return pc
->callback(drive
);
1766 static ide_startstop_t
idetape_rw_callback (ide_drive_t
*drive
)
1768 idetape_tape_t
*tape
= drive
->driver_data
;
1769 struct request
*rq
= HWGROUP(drive
)->rq
;
1770 int blocks
= tape
->pc
->actually_transferred
/ tape
->tape_block_size
;
1772 tape
->avg_size
+= blocks
* tape
->tape_block_size
;
1773 tape
->insert_size
+= blocks
* tape
->tape_block_size
;
1774 if (tape
->insert_size
> 1024 * 1024)
1775 tape
->measure_insert_time
= 1;
1776 if (tape
->measure_insert_time
) {
1777 tape
->measure_insert_time
= 0;
1778 tape
->insert_time
= jiffies
;
1779 tape
->insert_size
= 0;
1781 if (time_after(jiffies
, tape
->insert_time
))
1782 tape
->insert_speed
= tape
->insert_size
/ 1024 * HZ
/ (jiffies
- tape
->insert_time
);
1783 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
1784 tape
->avg_speed
= tape
->avg_size
* HZ
/ (jiffies
- tape
->avg_time
) / 1024;
1786 tape
->avg_time
= jiffies
;
1789 #if IDETAPE_DEBUG_LOG
1790 if (tape
->debug_level
>= 4)
1791 printk(KERN_INFO
"ide-tape: Reached idetape_rw_callback\n");
1792 #endif /* IDETAPE_DEBUG_LOG */
1794 tape
->first_frame_position
+= blocks
;
1795 rq
->current_nr_sectors
-= blocks
;
1797 if (!tape
->pc
->error
)
1798 idetape_end_request(drive
, 1, 0);
1800 idetape_end_request(drive
, tape
->pc
->error
, 0);
1804 static void idetape_create_read_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
, unsigned int length
, struct idetape_bh
*bh
)
1806 idetape_init_pc(pc
);
1807 pc
->c
[0] = IDETAPE_READ_CMD
;
1808 put_unaligned(htonl(length
), (unsigned int *) &pc
->c
[1]);
1810 pc
->callback
= &idetape_rw_callback
;
1812 atomic_set(&bh
->b_count
, 0);
1814 pc
->request_transfer
= pc
->buffer_size
= length
* tape
->tape_block_size
;
1815 if (pc
->request_transfer
== tape
->stage_size
)
1816 set_bit(PC_DMA_RECOMMENDED
, &pc
->flags
);
1819 static void idetape_create_read_buffer_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
, unsigned int length
, struct idetape_bh
*bh
)
1822 struct idetape_bh
*p
= bh
;
1824 idetape_init_pc(pc
);
1825 pc
->c
[0] = IDETAPE_READ_BUFFER_CMD
;
1826 pc
->c
[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK
;
1827 pc
->c
[7] = size
>> 8;
1828 pc
->c
[8] = size
& 0xff;
1829 pc
->callback
= &idetape_pc_callback
;
1831 atomic_set(&bh
->b_count
, 0);
1834 atomic_set(&p
->b_count
, 0);
1837 pc
->request_transfer
= pc
->buffer_size
= size
;
1840 static void idetape_create_write_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
, unsigned int length
, struct idetape_bh
*bh
)
1842 idetape_init_pc(pc
);
1843 pc
->c
[0] = IDETAPE_WRITE_CMD
;
1844 put_unaligned(htonl(length
), (unsigned int *) &pc
->c
[1]);
1846 pc
->callback
= &idetape_rw_callback
;
1847 set_bit(PC_WRITING
, &pc
->flags
);
1849 pc
->b_data
= bh
->b_data
;
1850 pc
->b_count
= atomic_read(&bh
->b_count
);
1852 pc
->request_transfer
= pc
->buffer_size
= length
* tape
->tape_block_size
;
1853 if (pc
->request_transfer
== tape
->stage_size
)
1854 set_bit(PC_DMA_RECOMMENDED
, &pc
->flags
);
1858 * idetape_do_request is our request handling function.
1860 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
1861 struct request
*rq
, sector_t block
)
1863 idetape_tape_t
*tape
= drive
->driver_data
;
1864 idetape_pc_t
*pc
= NULL
;
1865 struct request
*postponed_rq
= tape
->postponed_rq
;
1868 #if IDETAPE_DEBUG_LOG
1869 if (tape
->debug_level
>= 2)
1870 printk(KERN_INFO
"ide-tape: sector: %ld, "
1871 "nr_sectors: %ld, current_nr_sectors: %d\n",
1872 rq
->sector
, rq
->nr_sectors
, rq
->current_nr_sectors
);
1873 #endif /* IDETAPE_DEBUG_LOG */
1875 if (!blk_special_request(rq
)) {
1877 * We do not support buffer cache originated requests.
1879 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
1880 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
1881 ide_end_request(drive
, 0, 0);
1886 * Retry a failed packet command
1888 if (tape
->failed_pc
!= NULL
&&
1889 tape
->pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
) {
1890 return idetape_issue_packet_command(drive
, tape
->failed_pc
);
1892 if (postponed_rq
!= NULL
)
1893 if (rq
!= postponed_rq
) {
1894 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
1895 "Two DSC requests were queued\n");
1896 idetape_end_request(drive
, 0, 0);
1900 tape
->postponed_rq
= NULL
;
1903 * If the tape is still busy, postpone our request and service
1904 * the other device meanwhile.
1906 stat
= drive
->hwif
->INB(IDE_STATUS_REG
);
1908 if (!drive
->dsc_overlap
&& !(rq
->cmd
[0] & REQ_IDETAPE_PC2
))
1909 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
1911 if (drive
->post_reset
== 1) {
1912 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
1913 drive
->post_reset
= 0;
1916 if (tape
->tape_still_time
> 100 && tape
->tape_still_time
< 200)
1917 tape
->measure_insert_time
= 1;
1918 if (time_after(jiffies
, tape
->insert_time
))
1919 tape
->insert_speed
= tape
->insert_size
/ 1024 * HZ
/ (jiffies
- tape
->insert_time
);
1920 calculate_speeds(drive
);
1921 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
) &&
1922 (stat
& SEEK_STAT
) == 0) {
1923 if (postponed_rq
== NULL
) {
1924 tape
->dsc_polling_start
= jiffies
;
1925 tape
->dsc_polling_frequency
= tape
->best_dsc_rw_frequency
;
1926 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
1927 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
1928 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
1930 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1931 idetape_media_access_finished(drive
);
1934 return ide_do_reset(drive
);
1936 } else if (time_after(jiffies
, tape
->dsc_polling_start
+ IDETAPE_DSC_MA_THRESHOLD
))
1937 tape
->dsc_polling_frequency
= IDETAPE_DSC_MA_SLOW
;
1938 idetape_postpone_request(drive
);
1941 if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1942 tape
->buffer_head
++;
1943 tape
->postpone_cnt
= 0;
1944 pc
= idetape_next_pc_storage(drive
);
1945 idetape_create_read_cmd(tape
, pc
, rq
->current_nr_sectors
, (struct idetape_bh
*)rq
->special
);
1948 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1949 tape
->buffer_head
++;
1950 tape
->postpone_cnt
= 0;
1951 pc
= idetape_next_pc_storage(drive
);
1952 idetape_create_write_cmd(tape
, pc
, rq
->current_nr_sectors
, (struct idetape_bh
*)rq
->special
);
1955 if (rq
->cmd
[0] & REQ_IDETAPE_READ_BUFFER
) {
1956 tape
->postpone_cnt
= 0;
1957 pc
= idetape_next_pc_storage(drive
);
1958 idetape_create_read_buffer_cmd(tape
, pc
, rq
->current_nr_sectors
, (struct idetape_bh
*)rq
->special
);
1961 if (rq
->cmd
[0] & REQ_IDETAPE_PC1
) {
1962 pc
= (idetape_pc_t
*) rq
->buffer
;
1963 rq
->cmd
[0] &= ~(REQ_IDETAPE_PC1
);
1964 rq
->cmd
[0] |= REQ_IDETAPE_PC2
;
1967 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1968 idetape_media_access_finished(drive
);
1973 return idetape_issue_packet_command(drive
, pc
);
1977 * Pipeline related functions
1979 static inline int idetape_pipeline_active (idetape_tape_t
*tape
)
1983 rc1
= test_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
1984 rc2
= (tape
->active_data_request
!= NULL
);
1989 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
1990 * stage, along with all the necessary small buffers which together make
1991 * a buffer of size tape->stage_size (or a bit more). We attempt to
1992 * combine sequential pages as much as possible.
1994 * Returns a pointer to the new allocated stage, or NULL if we
1995 * can't (or don't want to) allocate a stage.
1997 * Pipeline stages are optional and are used to increase performance.
1998 * If we can't allocate them, we'll manage without them.
2000 static idetape_stage_t
*__idetape_kmalloc_stage (idetape_tape_t
*tape
, int full
, int clear
)
2002 idetape_stage_t
*stage
;
2003 struct idetape_bh
*prev_bh
, *bh
;
2004 int pages
= tape
->pages_per_stage
;
2005 char *b_data
= NULL
;
2007 if ((stage
= kmalloc(sizeof (idetape_stage_t
),GFP_KERNEL
)) == NULL
)
2011 bh
= stage
->bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
2014 bh
->b_reqnext
= NULL
;
2015 if ((bh
->b_data
= (char *) __get_free_page (GFP_KERNEL
)) == NULL
)
2018 memset(bh
->b_data
, 0, PAGE_SIZE
);
2019 bh
->b_size
= PAGE_SIZE
;
2020 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
2023 if ((b_data
= (char *) __get_free_page (GFP_KERNEL
)) == NULL
)
2026 memset(b_data
, 0, PAGE_SIZE
);
2027 if (bh
->b_data
== b_data
+ PAGE_SIZE
) {
2028 bh
->b_size
+= PAGE_SIZE
;
2029 bh
->b_data
-= PAGE_SIZE
;
2031 atomic_add(PAGE_SIZE
, &bh
->b_count
);
2034 if (b_data
== bh
->b_data
+ bh
->b_size
) {
2035 bh
->b_size
+= PAGE_SIZE
;
2037 atomic_add(PAGE_SIZE
, &bh
->b_count
);
2041 if ((bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
)) == NULL
) {
2042 free_page((unsigned long) b_data
);
2045 bh
->b_reqnext
= NULL
;
2046 bh
->b_data
= b_data
;
2047 bh
->b_size
= PAGE_SIZE
;
2048 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
2049 prev_bh
->b_reqnext
= bh
;
2051 bh
->b_size
-= tape
->excess_bh_size
;
2053 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
2056 __idetape_kfree_stage(stage
);
2060 static idetape_stage_t
*idetape_kmalloc_stage (idetape_tape_t
*tape
)
2062 idetape_stage_t
*cache_stage
= tape
->cache_stage
;
2064 #if IDETAPE_DEBUG_LOG
2065 if (tape
->debug_level
>= 4)
2066 printk(KERN_INFO
"ide-tape: Reached idetape_kmalloc_stage\n");
2067 #endif /* IDETAPE_DEBUG_LOG */
2069 if (tape
->nr_stages
>= tape
->max_stages
)
2071 if (cache_stage
!= NULL
) {
2072 tape
->cache_stage
= NULL
;
2075 return __idetape_kmalloc_stage(tape
, 0, 0);
2078 static int idetape_copy_stage_from_user (idetape_tape_t
*tape
, idetape_stage_t
*stage
, const char __user
*buf
, int n
)
2080 struct idetape_bh
*bh
= tape
->bh
;
2086 printk(KERN_ERR
"ide-tape: bh == NULL in "
2087 "idetape_copy_stage_from_user\n");
2090 count
= min((unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)), (unsigned int)n
);
2091 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
, count
))
2094 atomic_add(count
, &bh
->b_count
);
2096 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
2099 atomic_set(&bh
->b_count
, 0);
2106 static int idetape_copy_stage_to_user (idetape_tape_t
*tape
, char __user
*buf
, idetape_stage_t
*stage
, int n
)
2108 struct idetape_bh
*bh
= tape
->bh
;
2114 printk(KERN_ERR
"ide-tape: bh == NULL in "
2115 "idetape_copy_stage_to_user\n");
2118 count
= min(tape
->b_count
, n
);
2119 if (copy_to_user(buf
, tape
->b_data
, count
))
2122 tape
->b_data
+= count
;
2123 tape
->b_count
-= count
;
2125 if (!tape
->b_count
) {
2126 tape
->bh
= bh
= bh
->b_reqnext
;
2128 tape
->b_data
= bh
->b_data
;
2129 tape
->b_count
= atomic_read(&bh
->b_count
);
2136 static void idetape_init_merge_stage (idetape_tape_t
*tape
)
2138 struct idetape_bh
*bh
= tape
->merge_stage
->bh
;
2141 if (tape
->chrdev_direction
== idetape_direction_write
)
2142 atomic_set(&bh
->b_count
, 0);
2144 tape
->b_data
= bh
->b_data
;
2145 tape
->b_count
= atomic_read(&bh
->b_count
);
2149 static void idetape_switch_buffers (idetape_tape_t
*tape
, idetape_stage_t
*stage
)
2151 struct idetape_bh
*tmp
;
2154 stage
->bh
= tape
->merge_stage
->bh
;
2155 tape
->merge_stage
->bh
= tmp
;
2156 idetape_init_merge_stage(tape
);
2160 * idetape_add_stage_tail adds a new stage at the end of the pipeline.
2162 static void idetape_add_stage_tail (ide_drive_t
*drive
,idetape_stage_t
*stage
)
2164 idetape_tape_t
*tape
= drive
->driver_data
;
2165 unsigned long flags
;
2167 #if IDETAPE_DEBUG_LOG
2168 if (tape
->debug_level
>= 4)
2169 printk (KERN_INFO
"ide-tape: Reached idetape_add_stage_tail\n");
2170 #endif /* IDETAPE_DEBUG_LOG */
2171 spin_lock_irqsave(&tape
->spinlock
, flags
);
2173 if (tape
->last_stage
!= NULL
)
2174 tape
->last_stage
->next
=stage
;
2176 tape
->first_stage
= tape
->next_stage
=stage
;
2177 tape
->last_stage
= stage
;
2178 if (tape
->next_stage
== NULL
)
2179 tape
->next_stage
= tape
->last_stage
;
2181 tape
->nr_pending_stages
++;
2182 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2186 * idetape_wait_for_request installs a completion in a pending request
2187 * and sleeps until it is serviced.
2189 * The caller should ensure that the request will not be serviced
2190 * before we install the completion (usually by disabling interrupts).
2192 static void idetape_wait_for_request (ide_drive_t
*drive
, struct request
*rq
)
2194 DECLARE_COMPLETION_ONSTACK(wait
);
2195 idetape_tape_t
*tape
= drive
->driver_data
;
2197 if (rq
== NULL
|| !blk_special_request(rq
)) {
2198 printk (KERN_ERR
"ide-tape: bug: Trying to sleep on non-valid request\n");
2201 rq
->end_io_data
= &wait
;
2202 rq
->end_io
= blk_end_sync_rq
;
2203 spin_unlock_irq(&tape
->spinlock
);
2204 wait_for_completion(&wait
);
2205 /* The stage and its struct request have been deallocated */
2206 spin_lock_irq(&tape
->spinlock
);
2209 static ide_startstop_t
idetape_read_position_callback (ide_drive_t
*drive
)
2211 idetape_tape_t
*tape
= drive
->driver_data
;
2212 idetape_read_position_result_t
*result
;
2214 #if IDETAPE_DEBUG_LOG
2215 if (tape
->debug_level
>= 4)
2216 printk(KERN_INFO
"ide-tape: Reached idetape_read_position_callback\n");
2217 #endif /* IDETAPE_DEBUG_LOG */
2219 if (!tape
->pc
->error
) {
2220 result
= (idetape_read_position_result_t
*) tape
->pc
->buffer
;
2221 #if IDETAPE_DEBUG_LOG
2222 if (tape
->debug_level
>= 2)
2223 printk(KERN_INFO
"ide-tape: BOP - %s\n",result
->bop
? "Yes":"No");
2224 if (tape
->debug_level
>= 2)
2225 printk(KERN_INFO
"ide-tape: EOP - %s\n",result
->eop
? "Yes":"No");
2226 #endif /* IDETAPE_DEBUG_LOG */
2228 printk(KERN_INFO
"ide-tape: Block location is unknown to the tape\n");
2229 clear_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
);
2230 idetape_end_request(drive
, 0, 0);
2232 #if IDETAPE_DEBUG_LOG
2233 if (tape
->debug_level
>= 2)
2234 printk(KERN_INFO
"ide-tape: Block Location - %u\n", ntohl(result
->first_block
));
2235 #endif /* IDETAPE_DEBUG_LOG */
2236 tape
->partition
= result
->partition
;
2237 tape
->first_frame_position
= ntohl(result
->first_block
);
2238 tape
->last_frame_position
= ntohl(result
->last_block
);
2239 tape
->blocks_in_buffer
= result
->blocks_in_buffer
[2];
2240 set_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
);
2241 idetape_end_request(drive
, 1, 0);
2244 idetape_end_request(drive
, 0, 0);
2250 * idetape_create_write_filemark_cmd will:
2252 * 1. Write a filemark if write_filemark=1.
2253 * 2. Flush the device buffers without writing a filemark
2254 * if write_filemark=0.
2257 static void idetape_create_write_filemark_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
,int write_filemark
)
2259 idetape_init_pc(pc
);
2260 pc
->c
[0] = IDETAPE_WRITE_FILEMARK_CMD
;
2261 pc
->c
[4] = write_filemark
;
2262 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2263 pc
->callback
= &idetape_pc_callback
;
2266 static void idetape_create_test_unit_ready_cmd(idetape_pc_t
*pc
)
2268 idetape_init_pc(pc
);
2269 pc
->c
[0] = IDETAPE_TEST_UNIT_READY_CMD
;
2270 pc
->callback
= &idetape_pc_callback
;
2274 * idetape_queue_pc_tail is based on the following functions:
2276 * ide_do_drive_cmd from ide.c
2277 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
2279 * We add a special packet command request to the tail of the request
2280 * queue, and wait for it to be serviced.
2282 * This is not to be called from within the request handling part
2283 * of the driver ! We allocate here data in the stack, and it is valid
2284 * until the request is finished. This is not the case for the bottom
2285 * part of the driver, where we are always leaving the functions to wait
2286 * for an interrupt or a timer event.
2288 * From the bottom part of the driver, we should allocate safe memory
2289 * using idetape_next_pc_storage and idetape_next_rq_storage, and add
2290 * the request to the request list without waiting for it to be serviced !
2291 * In that case, we usually use idetape_queue_pc_head.
2293 static int __idetape_queue_pc_tail (ide_drive_t
*drive
, idetape_pc_t
*pc
)
2295 struct ide_tape_obj
*tape
= drive
->driver_data
;
2298 idetape_init_rq(&rq
, REQ_IDETAPE_PC1
);
2299 rq
.buffer
= (char *) pc
;
2300 rq
.rq_disk
= tape
->disk
;
2301 return ide_do_drive_cmd(drive
, &rq
, ide_wait
);
2304 static void idetape_create_load_unload_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
,int cmd
)
2306 idetape_init_pc(pc
);
2307 pc
->c
[0] = IDETAPE_LOAD_UNLOAD_CMD
;
2309 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2310 pc
->callback
= &idetape_pc_callback
;
2313 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
2315 idetape_tape_t
*tape
= drive
->driver_data
;
2317 int load_attempted
= 0;
2320 * Wait for the tape to become ready
2322 set_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
);
2324 while (time_before(jiffies
, timeout
)) {
2325 idetape_create_test_unit_ready_cmd(&pc
);
2326 if (!__idetape_queue_pc_tail(drive
, &pc
))
2328 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
2329 || (tape
->asc
== 0x3A)) { /* no media */
2332 idetape_create_load_unload_cmd(drive
, &pc
, IDETAPE_LU_LOAD_MASK
);
2333 __idetape_queue_pc_tail(drive
, &pc
);
2335 /* not about to be ready */
2336 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
2337 (tape
->ascq
== 1 || tape
->ascq
== 8)))
2344 static int idetape_queue_pc_tail (ide_drive_t
*drive
,idetape_pc_t
*pc
)
2346 return __idetape_queue_pc_tail(drive
, pc
);
2349 static int idetape_flush_tape_buffers (ide_drive_t
*drive
)
2354 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
2355 if ((rc
= idetape_queue_pc_tail(drive
, &pc
)))
2357 idetape_wait_ready(drive
, 60 * 5 * HZ
);
2361 static void idetape_create_read_position_cmd (idetape_pc_t
*pc
)
2363 idetape_init_pc(pc
);
2364 pc
->c
[0] = IDETAPE_READ_POSITION_CMD
;
2365 pc
->request_transfer
= 20;
2366 pc
->callback
= &idetape_read_position_callback
;
2369 static int idetape_read_position (ide_drive_t
*drive
)
2371 idetape_tape_t
*tape
= drive
->driver_data
;
2375 #if IDETAPE_DEBUG_LOG
2376 if (tape
->debug_level
>= 4)
2377 printk(KERN_INFO
"ide-tape: Reached idetape_read_position\n");
2378 #endif /* IDETAPE_DEBUG_LOG */
2380 idetape_create_read_position_cmd(&pc
);
2381 if (idetape_queue_pc_tail(drive
, &pc
))
2383 position
= tape
->first_frame_position
;
2387 static void idetape_create_locate_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
, unsigned int block
, u8 partition
, int skip
)
2389 idetape_init_pc(pc
);
2390 pc
->c
[0] = IDETAPE_LOCATE_CMD
;
2392 put_unaligned(htonl(block
), (unsigned int *) &pc
->c
[3]);
2393 pc
->c
[8] = partition
;
2394 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2395 pc
->callback
= &idetape_pc_callback
;
2398 static int idetape_create_prevent_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
, int prevent
)
2400 idetape_tape_t
*tape
= drive
->driver_data
;
2402 /* device supports locking according to capabilities page */
2403 if (!(tape
->caps
[6] & 0x01))
2406 idetape_init_pc(pc
);
2407 pc
->c
[0] = IDETAPE_PREVENT_CMD
;
2409 pc
->callback
= &idetape_pc_callback
;
2413 static int __idetape_discard_read_pipeline (ide_drive_t
*drive
)
2415 idetape_tape_t
*tape
= drive
->driver_data
;
2416 unsigned long flags
;
2419 if (tape
->chrdev_direction
!= idetape_direction_read
)
2422 /* Remove merge stage. */
2423 cnt
= tape
->merge_stage_size
/ tape
->tape_block_size
;
2424 if (test_and_clear_bit(IDETAPE_FILEMARK
, &tape
->flags
))
2425 ++cnt
; /* Filemarks count as 1 sector */
2426 tape
->merge_stage_size
= 0;
2427 if (tape
->merge_stage
!= NULL
) {
2428 __idetape_kfree_stage(tape
->merge_stage
);
2429 tape
->merge_stage
= NULL
;
2432 /* Clear pipeline flags. */
2433 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
2434 tape
->chrdev_direction
= idetape_direction_none
;
2436 /* Remove pipeline stages. */
2437 if (tape
->first_stage
== NULL
)
2440 spin_lock_irqsave(&tape
->spinlock
, flags
);
2441 tape
->next_stage
= NULL
;
2442 if (idetape_pipeline_active(tape
))
2443 idetape_wait_for_request(drive
, tape
->active_data_request
);
2444 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2446 while (tape
->first_stage
!= NULL
) {
2447 struct request
*rq_ptr
= &tape
->first_stage
->rq
;
2449 cnt
+= rq_ptr
->nr_sectors
- rq_ptr
->current_nr_sectors
;
2450 if (rq_ptr
->errors
== IDETAPE_ERROR_FILEMARK
)
2452 idetape_remove_stage_head(drive
);
2454 tape
->nr_pending_stages
= 0;
2455 tape
->max_stages
= tape
->min_pipeline
;
2460 * idetape_position_tape positions the tape to the requested block
2461 * using the LOCATE packet command. A READ POSITION command is then
2462 * issued to check where we are positioned.
2464 * Like all higher level operations, we queue the commands at the tail
2465 * of the request queue and wait for their completion.
2468 static int idetape_position_tape (ide_drive_t
*drive
, unsigned int block
, u8 partition
, int skip
)
2470 idetape_tape_t
*tape
= drive
->driver_data
;
2474 if (tape
->chrdev_direction
== idetape_direction_read
)
2475 __idetape_discard_read_pipeline(drive
);
2476 idetape_wait_ready(drive
, 60 * 5 * HZ
);
2477 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
2478 retval
= idetape_queue_pc_tail(drive
, &pc
);
2482 idetape_create_read_position_cmd(&pc
);
2483 return (idetape_queue_pc_tail(drive
, &pc
));
2486 static void idetape_discard_read_pipeline (ide_drive_t
*drive
, int restore_position
)
2488 idetape_tape_t
*tape
= drive
->driver_data
;
2492 cnt
= __idetape_discard_read_pipeline(drive
);
2493 if (restore_position
) {
2494 position
= idetape_read_position(drive
);
2495 seek
= position
> cnt
? position
- cnt
: 0;
2496 if (idetape_position_tape(drive
, seek
, 0, 0)) {
2497 printk(KERN_INFO
"ide-tape: %s: position_tape failed in discard_pipeline()\n", tape
->name
);
2504 * idetape_queue_rw_tail generates a read/write request for the block
2505 * device interface and wait for it to be serviced.
2507 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
, struct idetape_bh
*bh
)
2509 idetape_tape_t
*tape
= drive
->driver_data
;
2512 #if IDETAPE_DEBUG_LOG
2513 if (tape
->debug_level
>= 2)
2514 printk(KERN_INFO
"ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd
);
2515 #endif /* IDETAPE_DEBUG_LOG */
2516 if (idetape_pipeline_active(tape
)) {
2517 printk(KERN_ERR
"ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
2521 idetape_init_rq(&rq
, cmd
);
2522 rq
.rq_disk
= tape
->disk
;
2523 rq
.special
= (void *)bh
;
2524 rq
.sector
= tape
->first_frame_position
;
2525 rq
.nr_sectors
= rq
.current_nr_sectors
= blocks
;
2526 (void) ide_do_drive_cmd(drive
, &rq
, ide_wait
);
2528 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
2531 if (tape
->merge_stage
)
2532 idetape_init_merge_stage(tape
);
2533 if (rq
.errors
== IDETAPE_ERROR_GENERAL
)
2535 return (tape
->tape_block_size
* (blocks
-rq
.current_nr_sectors
));
2539 * idetape_insert_pipeline_into_queue is used to start servicing the
2540 * pipeline stages, starting from tape->next_stage.
2542 static void idetape_insert_pipeline_into_queue (ide_drive_t
*drive
)
2544 idetape_tape_t
*tape
= drive
->driver_data
;
2546 if (tape
->next_stage
== NULL
)
2548 if (!idetape_pipeline_active(tape
)) {
2549 set_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
2550 idetape_active_next_stage(drive
);
2551 (void) ide_do_drive_cmd(drive
, tape
->active_data_request
, ide_end
);
2555 static void idetape_create_inquiry_cmd (idetape_pc_t
*pc
)
2557 idetape_init_pc(pc
);
2558 pc
->c
[0] = IDETAPE_INQUIRY_CMD
;
2559 pc
->c
[4] = pc
->request_transfer
= 254;
2560 pc
->callback
= &idetape_pc_callback
;
2563 static void idetape_create_rewind_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
)
2565 idetape_init_pc(pc
);
2566 pc
->c
[0] = IDETAPE_REWIND_CMD
;
2567 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2568 pc
->callback
= &idetape_pc_callback
;
2571 static void idetape_create_erase_cmd (idetape_pc_t
*pc
)
2573 idetape_init_pc(pc
);
2574 pc
->c
[0] = IDETAPE_ERASE_CMD
;
2576 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2577 pc
->callback
= &idetape_pc_callback
;
2580 static void idetape_create_space_cmd (idetape_pc_t
*pc
,int count
, u8 cmd
)
2582 idetape_init_pc(pc
);
2583 pc
->c
[0] = IDETAPE_SPACE_CMD
;
2584 put_unaligned(htonl(count
), (unsigned int *) &pc
->c
[1]);
2586 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2587 pc
->callback
= &idetape_pc_callback
;
2590 static void idetape_wait_first_stage (ide_drive_t
*drive
)
2592 idetape_tape_t
*tape
= drive
->driver_data
;
2593 unsigned long flags
;
2595 if (tape
->first_stage
== NULL
)
2597 spin_lock_irqsave(&tape
->spinlock
, flags
);
2598 if (tape
->active_stage
== tape
->first_stage
)
2599 idetape_wait_for_request(drive
, tape
->active_data_request
);
2600 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2604 * idetape_add_chrdev_write_request tries to add a character device
2605 * originated write request to our pipeline. In case we don't succeed,
2606 * we revert to non-pipelined operation mode for this request.
2608 * 1. Try to allocate a new pipeline stage.
2609 * 2. If we can't, wait for more and more requests to be serviced
2610 * and try again each time.
2611 * 3. If we still can't allocate a stage, fallback to
2612 * non-pipelined operation mode for this request.
2614 static int idetape_add_chrdev_write_request (ide_drive_t
*drive
, int blocks
)
2616 idetape_tape_t
*tape
= drive
->driver_data
;
2617 idetape_stage_t
*new_stage
;
2618 unsigned long flags
;
2621 #if IDETAPE_DEBUG_LOG
2622 if (tape
->debug_level
>= 3)
2623 printk(KERN_INFO
"ide-tape: Reached idetape_add_chrdev_write_request\n");
2624 #endif /* IDETAPE_DEBUG_LOG */
2627 * Attempt to allocate a new stage.
2628 * Pay special attention to possible race conditions.
2630 while ((new_stage
= idetape_kmalloc_stage(tape
)) == NULL
) {
2631 spin_lock_irqsave(&tape
->spinlock
, flags
);
2632 if (idetape_pipeline_active(tape
)) {
2633 idetape_wait_for_request(drive
, tape
->active_data_request
);
2634 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2636 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2637 idetape_insert_pipeline_into_queue(drive
);
2638 if (idetape_pipeline_active(tape
))
2641 * Linux is short on memory. Fallback to
2642 * non-pipelined operation mode for this request.
2644 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
, tape
->merge_stage
->bh
);
2647 rq
= &new_stage
->rq
;
2648 idetape_init_rq(rq
, REQ_IDETAPE_WRITE
);
2649 /* Doesn't actually matter - We always assume sequential access */
2650 rq
->sector
= tape
->first_frame_position
;
2651 rq
->nr_sectors
= rq
->current_nr_sectors
= blocks
;
2653 idetape_switch_buffers(tape
, new_stage
);
2654 idetape_add_stage_tail(drive
, new_stage
);
2655 tape
->pipeline_head
++;
2656 calculate_speeds(drive
);
2659 * Estimate whether the tape has stopped writing by checking
2660 * if our write pipeline is currently empty. If we are not
2661 * writing anymore, wait for the pipeline to be full enough
2662 * (90%) before starting to service requests, so that we will
2663 * be able to keep up with the higher speeds of the tape.
2665 if (!idetape_pipeline_active(tape
)) {
2666 if (tape
->nr_stages
>= tape
->max_stages
* 9 / 10 ||
2667 tape
->nr_stages
>= tape
->max_stages
- tape
->uncontrolled_pipeline_head_speed
* 3 * 1024 / tape
->tape_block_size
) {
2668 tape
->measure_insert_time
= 1;
2669 tape
->insert_time
= jiffies
;
2670 tape
->insert_size
= 0;
2671 tape
->insert_speed
= 0;
2672 idetape_insert_pipeline_into_queue(drive
);
2675 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
))
2676 /* Return a deferred error */
2682 * idetape_wait_for_pipeline will wait until all pending pipeline
2683 * requests are serviced. Typically called on device close.
2685 static void idetape_wait_for_pipeline (ide_drive_t
*drive
)
2687 idetape_tape_t
*tape
= drive
->driver_data
;
2688 unsigned long flags
;
2690 while (tape
->next_stage
|| idetape_pipeline_active(tape
)) {
2691 idetape_insert_pipeline_into_queue(drive
);
2692 spin_lock_irqsave(&tape
->spinlock
, flags
);
2693 if (idetape_pipeline_active(tape
))
2694 idetape_wait_for_request(drive
, tape
->active_data_request
);
2695 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2699 static void idetape_empty_write_pipeline (ide_drive_t
*drive
)
2701 idetape_tape_t
*tape
= drive
->driver_data
;
2703 struct idetape_bh
*bh
;
2705 if (tape
->chrdev_direction
!= idetape_direction_write
) {
2706 printk(KERN_ERR
"ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
2709 if (tape
->merge_stage_size
> tape
->stage_size
) {
2710 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
2711 tape
->merge_stage_size
= tape
->stage_size
;
2713 if (tape
->merge_stage_size
) {
2714 blocks
= tape
->merge_stage_size
/ tape
->tape_block_size
;
2715 if (tape
->merge_stage_size
% tape
->tape_block_size
) {
2719 i
= tape
->tape_block_size
- tape
->merge_stage_size
% tape
->tape_block_size
;
2720 bh
= tape
->bh
->b_reqnext
;
2722 atomic_set(&bh
->b_count
, 0);
2729 printk(KERN_INFO
"ide-tape: bug, bh NULL\n");
2732 min
= min(i
, (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)));
2733 memset(bh
->b_data
+ atomic_read(&bh
->b_count
), 0, min
);
2734 atomic_add(min
, &bh
->b_count
);
2739 (void) idetape_add_chrdev_write_request(drive
, blocks
);
2740 tape
->merge_stage_size
= 0;
2742 idetape_wait_for_pipeline(drive
);
2743 if (tape
->merge_stage
!= NULL
) {
2744 __idetape_kfree_stage(tape
->merge_stage
);
2745 tape
->merge_stage
= NULL
;
2747 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
2748 tape
->chrdev_direction
= idetape_direction_none
;
2751 * On the next backup, perform the feedback loop again.
2752 * (I don't want to keep sense information between backups,
2753 * as some systems are constantly on, and the system load
2754 * can be totally different on the next backup).
2756 tape
->max_stages
= tape
->min_pipeline
;
2757 if (tape
->first_stage
!= NULL
||
2758 tape
->next_stage
!= NULL
||
2759 tape
->last_stage
!= NULL
||
2760 tape
->nr_stages
!= 0) {
2761 printk(KERN_ERR
"ide-tape: ide-tape pipeline bug, "
2762 "first_stage %p, next_stage %p, "
2763 "last_stage %p, nr_stages %d\n",
2764 tape
->first_stage
, tape
->next_stage
,
2765 tape
->last_stage
, tape
->nr_stages
);
2769 static void idetape_restart_speed_control (ide_drive_t
*drive
)
2771 idetape_tape_t
*tape
= drive
->driver_data
;
2773 tape
->restart_speed_control_req
= 0;
2774 tape
->pipeline_head
= 0;
2775 tape
->controlled_last_pipeline_head
= tape
->uncontrolled_last_pipeline_head
= 0;
2776 tape
->controlled_previous_pipeline_head
= tape
->uncontrolled_previous_pipeline_head
= 0;
2777 tape
->pipeline_head_speed
= tape
->controlled_pipeline_head_speed
= 5000;
2778 tape
->uncontrolled_pipeline_head_speed
= 0;
2779 tape
->controlled_pipeline_head_time
= tape
->uncontrolled_pipeline_head_time
= jiffies
;
2780 tape
->controlled_previous_head_time
= tape
->uncontrolled_previous_head_time
= jiffies
;
2783 static int idetape_initiate_read (ide_drive_t
*drive
, int max_stages
)
2785 idetape_tape_t
*tape
= drive
->driver_data
;
2786 idetape_stage_t
*new_stage
;
2789 u16 blocks
= *(u16
*)&tape
->caps
[12];
2791 /* Initialize read operation */
2792 if (tape
->chrdev_direction
!= idetape_direction_read
) {
2793 if (tape
->chrdev_direction
== idetape_direction_write
) {
2794 idetape_empty_write_pipeline(drive
);
2795 idetape_flush_tape_buffers(drive
);
2797 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
2798 printk (KERN_ERR
"ide-tape: merge_stage_size should be 0 now\n");
2799 tape
->merge_stage_size
= 0;
2801 if ((tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 0, 0)) == NULL
)
2803 tape
->chrdev_direction
= idetape_direction_read
;
2806 * Issue a read 0 command to ensure that DSC handshake
2807 * is switched from completion mode to buffer available
2809 * No point in issuing this if DSC overlap isn't supported,
2810 * some drives (Seagate STT3401A) will return an error.
2812 if (drive
->dsc_overlap
) {
2813 bytes_read
= idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, 0, tape
->merge_stage
->bh
);
2814 if (bytes_read
< 0) {
2815 __idetape_kfree_stage(tape
->merge_stage
);
2816 tape
->merge_stage
= NULL
;
2817 tape
->chrdev_direction
= idetape_direction_none
;
2822 if (tape
->restart_speed_control_req
)
2823 idetape_restart_speed_control(drive
);
2824 idetape_init_rq(&rq
, REQ_IDETAPE_READ
);
2825 rq
.sector
= tape
->first_frame_position
;
2826 rq
.nr_sectors
= rq
.current_nr_sectors
= blocks
;
2827 if (!test_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
) &&
2828 tape
->nr_stages
< max_stages
) {
2829 new_stage
= idetape_kmalloc_stage(tape
);
2830 while (new_stage
!= NULL
) {
2832 idetape_add_stage_tail(drive
, new_stage
);
2833 if (tape
->nr_stages
>= max_stages
)
2835 new_stage
= idetape_kmalloc_stage(tape
);
2838 if (!idetape_pipeline_active(tape
)) {
2839 if (tape
->nr_pending_stages
>= 3 * max_stages
/ 4) {
2840 tape
->measure_insert_time
= 1;
2841 tape
->insert_time
= jiffies
;
2842 tape
->insert_size
= 0;
2843 tape
->insert_speed
= 0;
2844 idetape_insert_pipeline_into_queue(drive
);
2851 * idetape_add_chrdev_read_request is called from idetape_chrdev_read
2852 * to service a character device read request and add read-ahead
2853 * requests to our pipeline.
2855 static int idetape_add_chrdev_read_request (ide_drive_t
*drive
,int blocks
)
2857 idetape_tape_t
*tape
= drive
->driver_data
;
2858 unsigned long flags
;
2859 struct request
*rq_ptr
;
2862 #if IDETAPE_DEBUG_LOG
2863 if (tape
->debug_level
>= 4)
2864 printk(KERN_INFO
"ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks
);
2865 #endif /* IDETAPE_DEBUG_LOG */
2868 * If we are at a filemark, return a read length of 0
2870 if (test_bit(IDETAPE_FILEMARK
, &tape
->flags
))
2874 * Wait for the next block to be available at the head
2877 idetape_initiate_read(drive
, tape
->max_stages
);
2878 if (tape
->first_stage
== NULL
) {
2879 if (test_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
))
2881 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
, tape
->merge_stage
->bh
);
2883 idetape_wait_first_stage(drive
);
2884 rq_ptr
= &tape
->first_stage
->rq
;
2885 bytes_read
= tape
->tape_block_size
* (rq_ptr
->nr_sectors
- rq_ptr
->current_nr_sectors
);
2886 rq_ptr
->nr_sectors
= rq_ptr
->current_nr_sectors
= 0;
2889 if (rq_ptr
->errors
== IDETAPE_ERROR_EOD
)
2892 idetape_switch_buffers(tape
, tape
->first_stage
);
2893 if (rq_ptr
->errors
== IDETAPE_ERROR_FILEMARK
)
2894 set_bit(IDETAPE_FILEMARK
, &tape
->flags
);
2895 spin_lock_irqsave(&tape
->spinlock
, flags
);
2896 idetape_remove_stage_head(drive
);
2897 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2898 tape
->pipeline_head
++;
2899 calculate_speeds(drive
);
2901 if (bytes_read
> blocks
* tape
->tape_block_size
) {
2902 printk(KERN_ERR
"ide-tape: bug: trying to return more bytes than requested\n");
2903 bytes_read
= blocks
* tape
->tape_block_size
;
2905 return (bytes_read
);
2908 static void idetape_pad_zeros (ide_drive_t
*drive
, int bcount
)
2910 idetape_tape_t
*tape
= drive
->driver_data
;
2911 struct idetape_bh
*bh
;
2917 bh
= tape
->merge_stage
->bh
;
2918 count
= min(tape
->stage_size
, bcount
);
2920 blocks
= count
/ tape
->tape_block_size
;
2922 atomic_set(&bh
->b_count
, min(count
, (unsigned int)bh
->b_size
));
2923 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
2924 count
-= atomic_read(&bh
->b_count
);
2927 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
, tape
->merge_stage
->bh
);
2931 static int idetape_pipeline_size (ide_drive_t
*drive
)
2933 idetape_tape_t
*tape
= drive
->driver_data
;
2934 idetape_stage_t
*stage
;
2938 idetape_wait_for_pipeline(drive
);
2939 stage
= tape
->first_stage
;
2940 while (stage
!= NULL
) {
2942 size
+= tape
->tape_block_size
* (rq
->nr_sectors
-rq
->current_nr_sectors
);
2943 if (rq
->errors
== IDETAPE_ERROR_FILEMARK
)
2944 size
+= tape
->tape_block_size
;
2945 stage
= stage
->next
;
2947 size
+= tape
->merge_stage_size
;
2952 * Rewinds the tape to the Beginning Of the current Partition (BOP).
2954 * We currently support only one partition.
2956 static int idetape_rewind_tape (ide_drive_t
*drive
)
2960 #if IDETAPE_DEBUG_LOG
2961 idetape_tape_t
*tape
= drive
->driver_data
;
2962 if (tape
->debug_level
>= 2)
2963 printk(KERN_INFO
"ide-tape: Reached idetape_rewind_tape\n");
2964 #endif /* IDETAPE_DEBUG_LOG */
2966 idetape_create_rewind_cmd(drive
, &pc
);
2967 retval
= idetape_queue_pc_tail(drive
, &pc
);
2971 idetape_create_read_position_cmd(&pc
);
2972 retval
= idetape_queue_pc_tail(drive
, &pc
);
2979 * Our special ide-tape ioctl's.
2981 * Currently there aren't any ioctl's.
2982 * mtio.h compatible commands should be issued to the character device
2985 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
, unsigned long arg
)
2987 idetape_tape_t
*tape
= drive
->driver_data
;
2988 idetape_config_t config
;
2989 void __user
*argp
= (void __user
*)arg
;
2991 #if IDETAPE_DEBUG_LOG
2992 if (tape
->debug_level
>= 4)
2993 printk(KERN_INFO
"ide-tape: Reached idetape_blkdev_ioctl\n");
2994 #endif /* IDETAPE_DEBUG_LOG */
2997 if (copy_from_user(&config
, argp
, sizeof (idetape_config_t
)))
2999 tape
->best_dsc_rw_frequency
= config
.dsc_rw_frequency
;
3000 tape
->max_stages
= config
.nr_stages
;
3003 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_frequency
;
3004 config
.nr_stages
= tape
->max_stages
;
3005 if (copy_to_user(argp
, &config
, sizeof (idetape_config_t
)))
3015 * idetape_space_over_filemarks is now a bit more complicated than just
3016 * passing the command to the tape since we may have crossed some
3017 * filemarks during our pipelined read-ahead mode.
3019 * As a minor side effect, the pipeline enables us to support MTFSFM when
3020 * the filemark is in our internal pipeline even if the tape doesn't
3021 * support spacing over filemarks in the reverse direction.
3023 static int idetape_space_over_filemarks (ide_drive_t
*drive
,short mt_op
,int mt_count
)
3025 idetape_tape_t
*tape
= drive
->driver_data
;
3027 unsigned long flags
;
3029 int sprev
= !!(tape
->caps
[4] & 0x20);
3033 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
3036 mt_count
= - mt_count
;
3039 if (tape
->chrdev_direction
== idetape_direction_read
) {
3041 * We have a read-ahead buffer. Scan it for crossed
3044 tape
->merge_stage_size
= 0;
3045 if (test_and_clear_bit(IDETAPE_FILEMARK
, &tape
->flags
))
3047 while (tape
->first_stage
!= NULL
) {
3048 if (count
== mt_count
) {
3049 if (mt_op
== MTFSFM
)
3050 set_bit(IDETAPE_FILEMARK
, &tape
->flags
);
3053 spin_lock_irqsave(&tape
->spinlock
, flags
);
3054 if (tape
->first_stage
== tape
->active_stage
) {
3056 * We have reached the active stage in the read pipeline.
3057 * There is no point in allowing the drive to continue
3058 * reading any farther, so we stop the pipeline.
3060 * This section should be moved to a separate subroutine,
3061 * because a similar function is performed in
3062 * __idetape_discard_read_pipeline(), for example.
3064 tape
->next_stage
= NULL
;
3065 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
3066 idetape_wait_first_stage(drive
);
3067 tape
->next_stage
= tape
->first_stage
->next
;
3069 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
3070 if (tape
->first_stage
->rq
.errors
== IDETAPE_ERROR_FILEMARK
)
3072 idetape_remove_stage_head(drive
);
3074 idetape_discard_read_pipeline(drive
, 0);
3078 * The filemark was not found in our internal pipeline.
3079 * Now we can issue the space command.
3084 idetape_create_space_cmd(&pc
,mt_count
-count
,IDETAPE_SPACE_OVER_FILEMARK
);
3085 return (idetape_queue_pc_tail(drive
, &pc
));
3090 retval
= idetape_space_over_filemarks(drive
, MTFSF
, mt_count
-count
);
3091 if (retval
) return (retval
);
3092 count
= (MTBSFM
== mt_op
? 1 : -1);
3093 return (idetape_space_over_filemarks(drive
, MTFSF
, count
));
3095 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",mt_op
);
3102 * Our character device read / write functions.
3104 * The tape is optimized to maximize throughput when it is transferring
3105 * an integral number of the "continuous transfer limit", which is
3106 * a parameter of the specific tape (26 KB on my particular tape).
3107 * (32 kB for Onstream)
3109 * As of version 1.3 of the driver, the character device provides an
3110 * abstract continuous view of the media - any mix of block sizes (even 1
3111 * byte) on the same backup/restore procedure is supported. The driver
3112 * will internally convert the requests to the recommended transfer unit,
3113 * so that an unmatch between the user's block size to the recommended
3114 * size will only result in a (slightly) increased driver overhead, but
3115 * will no longer hit performance.
3116 * This is not applicable to Onstream.
3118 static ssize_t
idetape_chrdev_read (struct file
*file
, char __user
*buf
,
3119 size_t count
, loff_t
*ppos
)
3121 struct ide_tape_obj
*tape
= ide_tape_f(file
);
3122 ide_drive_t
*drive
= tape
->drive
;
3123 ssize_t bytes_read
,temp
, actually_read
= 0, rc
;
3125 u16 ctl
= *(u16
*)&tape
->caps
[12];
3127 #if IDETAPE_DEBUG_LOG
3128 if (tape
->debug_level
>= 3)
3129 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_read, count %Zd\n", count
);
3130 #endif /* IDETAPE_DEBUG_LOG */
3132 if (tape
->chrdev_direction
!= idetape_direction_read
) {
3133 if (test_bit(IDETAPE_DETECT_BS
, &tape
->flags
))
3134 if (count
> tape
->tape_block_size
&&
3135 (count
% tape
->tape_block_size
) == 0)
3136 tape
->user_bs_factor
= count
/ tape
->tape_block_size
;
3138 if ((rc
= idetape_initiate_read(drive
, tape
->max_stages
)) < 0)
3142 if (tape
->merge_stage_size
) {
3143 actually_read
= min((unsigned int)(tape
->merge_stage_size
), (unsigned int)count
);
3144 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
, actually_read
))
3146 buf
+= actually_read
;
3147 tape
->merge_stage_size
-= actually_read
;
3148 count
-= actually_read
;
3150 while (count
>= tape
->stage_size
) {
3151 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
3152 if (bytes_read
<= 0)
3154 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
, bytes_read
))
3157 count
-= bytes_read
;
3158 actually_read
+= bytes_read
;
3161 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
3162 if (bytes_read
<= 0)
3164 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
3165 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
, temp
))
3167 actually_read
+= temp
;
3168 tape
->merge_stage_size
= bytes_read
-temp
;
3171 if (!actually_read
&& test_bit(IDETAPE_FILEMARK
, &tape
->flags
)) {
3172 #if IDETAPE_DEBUG_LOG
3173 if (tape
->debug_level
>= 2)
3174 printk(KERN_INFO
"ide-tape: %s: spacing over filemark\n", tape
->name
);
3176 idetape_space_over_filemarks(drive
, MTFSF
, 1);
3180 return (ret
) ? ret
: actually_read
;
3183 static ssize_t
idetape_chrdev_write (struct file
*file
, const char __user
*buf
,
3184 size_t count
, loff_t
*ppos
)
3186 struct ide_tape_obj
*tape
= ide_tape_f(file
);
3187 ide_drive_t
*drive
= tape
->drive
;
3188 ssize_t actually_written
= 0;
3190 u16 ctl
= *(u16
*)&tape
->caps
[12];
3192 /* The drive is write protected. */
3193 if (tape
->write_prot
)
3196 #if IDETAPE_DEBUG_LOG
3197 if (tape
->debug_level
>= 3)
3198 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_write, "
3199 "count %Zd\n", count
);
3200 #endif /* IDETAPE_DEBUG_LOG */
3202 /* Initialize write operation */
3203 if (tape
->chrdev_direction
!= idetape_direction_write
) {
3204 if (tape
->chrdev_direction
== idetape_direction_read
)
3205 idetape_discard_read_pipeline(drive
, 1);
3206 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
3207 printk(KERN_ERR
"ide-tape: merge_stage_size "
3208 "should be 0 now\n");
3209 tape
->merge_stage_size
= 0;
3211 if ((tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 0, 0)) == NULL
)
3213 tape
->chrdev_direction
= idetape_direction_write
;
3214 idetape_init_merge_stage(tape
);
3217 * Issue a write 0 command to ensure that DSC handshake
3218 * is switched from completion mode to buffer available
3220 * No point in issuing this if DSC overlap isn't supported,
3221 * some drives (Seagate STT3401A) will return an error.
3223 if (drive
->dsc_overlap
) {
3224 ssize_t retval
= idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, 0, tape
->merge_stage
->bh
);
3226 __idetape_kfree_stage(tape
->merge_stage
);
3227 tape
->merge_stage
= NULL
;
3228 tape
->chrdev_direction
= idetape_direction_none
;
3235 if (tape
->restart_speed_control_req
)
3236 idetape_restart_speed_control(drive
);
3237 if (tape
->merge_stage_size
) {
3238 if (tape
->merge_stage_size
>= tape
->stage_size
) {
3239 printk(KERN_ERR
"ide-tape: bug: merge buffer too big\n");
3240 tape
->merge_stage_size
= 0;
3242 actually_written
= min((unsigned int)(tape
->stage_size
- tape
->merge_stage_size
), (unsigned int)count
);
3243 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
, actually_written
))
3245 buf
+= actually_written
;
3246 tape
->merge_stage_size
+= actually_written
;
3247 count
-= actually_written
;
3249 if (tape
->merge_stage_size
== tape
->stage_size
) {
3251 tape
->merge_stage_size
= 0;
3252 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
3257 while (count
>= tape
->stage_size
) {
3259 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
, tape
->stage_size
))
3261 buf
+= tape
->stage_size
;
3262 count
-= tape
->stage_size
;
3263 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
3264 actually_written
+= tape
->stage_size
;
3269 actually_written
+= count
;
3270 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
, count
))
3272 tape
->merge_stage_size
+= count
;
3274 return (ret
) ? ret
: actually_written
;
3277 static int idetape_write_filemark (ide_drive_t
*drive
)
3281 /* Write a filemark */
3282 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
3283 if (idetape_queue_pc_tail(drive
, &pc
)) {
3284 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
3291 * idetape_mtioctop is called from idetape_chrdev_ioctl when
3292 * the general mtio MTIOCTOP ioctl is requested.
3294 * We currently support the following mtio.h operations:
3296 * MTFSF - Space over mt_count filemarks in the positive direction.
3297 * The tape is positioned after the last spaced filemark.
3299 * MTFSFM - Same as MTFSF, but the tape is positioned before the
3302 * MTBSF - Steps background over mt_count filemarks, tape is
3303 * positioned before the last filemark.
3305 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark.
3309 * MTBSF and MTBSFM are not supported when the tape doesn't
3310 * support spacing over filemarks in the reverse direction.
3311 * In this case, MTFSFM is also usually not supported (it is
3312 * supported in the rare case in which we crossed the filemark
3313 * during our read-ahead pipelined operation mode).
3315 * MTWEOF - Writes mt_count filemarks. Tape is positioned after
3316 * the last written filemark.
3318 * MTREW - Rewinds tape.
3320 * MTLOAD - Loads the tape.
3322 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and
3323 * MTUNLOAD prevents further access until the media is replaced.
3325 * MTNOP - Flushes tape buffers.
3327 * MTRETEN - Retension media. This typically consists of one end
3328 * to end pass on the media.
3330 * MTEOM - Moves to the end of recorded data.
3332 * MTERASE - Erases tape.
3334 * MTSETBLK - Sets the user block size to mt_count bytes. If
3335 * mt_count is 0, we will attempt to autodetect
3338 * MTSEEK - Positions the tape in a specific block number, where
3339 * each block is assumed to contain which user_block_size
3342 * MTSETPART - Switches to another tape partition.
3344 * MTLOCK - Locks the tape door.
3346 * MTUNLOCK - Unlocks the tape door.
3348 * The following commands are currently not supported:
3350 * MTFSS, MTBSS, MTWSM, MTSETDENSITY,
3351 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD.
3353 static int idetape_mtioctop (ide_drive_t
*drive
,short mt_op
,int mt_count
)
3355 idetape_tape_t
*tape
= drive
->driver_data
;
3359 #if IDETAPE_DEBUG_LOG
3360 if (tape
->debug_level
>= 1)
3361 printk(KERN_INFO
"ide-tape: Handling MTIOCTOP ioctl: "
3362 "mt_op=%d, mt_count=%d\n", mt_op
, mt_count
);
3363 #endif /* IDETAPE_DEBUG_LOG */
3365 * Commands which need our pipelined read-ahead stages.
3374 return (idetape_space_over_filemarks(drive
,mt_op
,mt_count
));
3380 if (tape
->write_prot
)
3382 idetape_discard_read_pipeline(drive
, 1);
3383 for (i
= 0; i
< mt_count
; i
++) {
3384 retval
= idetape_write_filemark(drive
);
3390 idetape_discard_read_pipeline(drive
, 0);
3391 if (idetape_rewind_tape(drive
))
3395 idetape_discard_read_pipeline(drive
, 0);
3396 idetape_create_load_unload_cmd(drive
, &pc
, IDETAPE_LU_LOAD_MASK
);
3397 return (idetape_queue_pc_tail(drive
, &pc
));
3401 * If door is locked, attempt to unlock before
3402 * attempting to eject.
3404 if (tape
->door_locked
) {
3405 if (idetape_create_prevent_cmd(drive
, &pc
, 0))
3406 if (!idetape_queue_pc_tail(drive
, &pc
))
3407 tape
->door_locked
= DOOR_UNLOCKED
;
3409 idetape_discard_read_pipeline(drive
, 0);
3410 idetape_create_load_unload_cmd(drive
, &pc
,!IDETAPE_LU_LOAD_MASK
);
3411 retval
= idetape_queue_pc_tail(drive
, &pc
);
3413 clear_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
);
3416 idetape_discard_read_pipeline(drive
, 0);
3417 return (idetape_flush_tape_buffers(drive
));
3419 idetape_discard_read_pipeline(drive
, 0);
3420 idetape_create_load_unload_cmd(drive
, &pc
,IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
3421 return (idetape_queue_pc_tail(drive
, &pc
));
3423 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
3424 return (idetape_queue_pc_tail(drive
, &pc
));
3426 (void) idetape_rewind_tape(drive
);
3427 idetape_create_erase_cmd(&pc
);
3428 return (idetape_queue_pc_tail(drive
, &pc
));
3431 if (mt_count
< tape
->tape_block_size
|| mt_count
% tape
->tape_block_size
)
3433 tape
->user_bs_factor
= mt_count
/ tape
->tape_block_size
;
3434 clear_bit(IDETAPE_DETECT_BS
, &tape
->flags
);
3436 set_bit(IDETAPE_DETECT_BS
, &tape
->flags
);
3439 idetape_discard_read_pipeline(drive
, 0);
3440 return idetape_position_tape(drive
, mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
3442 idetape_discard_read_pipeline(drive
, 0);
3443 return (idetape_position_tape(drive
, 0, mt_count
, 0));
3447 if (!idetape_create_prevent_cmd(drive
, &pc
, 1))
3449 retval
= idetape_queue_pc_tail(drive
, &pc
);
3450 if (retval
) return retval
;
3451 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
3454 if (!idetape_create_prevent_cmd(drive
, &pc
, 0))
3456 retval
= idetape_queue_pc_tail(drive
, &pc
);
3457 if (retval
) return retval
;
3458 tape
->door_locked
= DOOR_UNLOCKED
;
3461 printk(KERN_ERR
"ide-tape: MTIO operation %d not "
3462 "supported\n", mt_op
);
3468 * Our character device ioctls.
3470 * General mtio.h magnetic io commands are supported here, and not in
3471 * the corresponding block interface.
3473 * The following ioctls are supported:
3475 * MTIOCTOP - Refer to idetape_mtioctop for detailed description.
3477 * MTIOCGET - The mt_dsreg field in the returned mtget structure
3478 * will be set to (user block size in bytes <<
3479 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK.
3481 * The mt_blkno is set to the current user block number.
3482 * The other mtget fields are not supported.
3484 * MTIOCPOS - The current tape "block position" is returned. We
3485 * assume that each block contains user_block_size
3488 * Our own ide-tape ioctls are supported on both interfaces.
3490 static int idetape_chrdev_ioctl (struct inode
*inode
, struct file
*file
, unsigned int cmd
, unsigned long arg
)
3492 struct ide_tape_obj
*tape
= ide_tape_f(file
);
3493 ide_drive_t
*drive
= tape
->drive
;
3497 int block_offset
= 0, position
= tape
->first_frame_position
;
3498 void __user
*argp
= (void __user
*)arg
;
3500 #if IDETAPE_DEBUG_LOG
3501 if (tape
->debug_level
>= 3)
3502 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_ioctl, "
3504 #endif /* IDETAPE_DEBUG_LOG */
3506 tape
->restart_speed_control_req
= 1;
3507 if (tape
->chrdev_direction
== idetape_direction_write
) {
3508 idetape_empty_write_pipeline(drive
);
3509 idetape_flush_tape_buffers(drive
);
3511 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
3512 block_offset
= idetape_pipeline_size(drive
) / (tape
->tape_block_size
* tape
->user_bs_factor
);
3513 if ((position
= idetape_read_position(drive
)) < 0)
3518 if (copy_from_user(&mtop
, argp
, sizeof (struct mtop
)))
3520 return (idetape_mtioctop(drive
,mtop
.mt_op
,mtop
.mt_count
));
3522 memset(&mtget
, 0, sizeof (struct mtget
));
3523 mtget
.mt_type
= MT_ISSCSI2
;
3524 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
3525 mtget
.mt_dsreg
= ((tape
->tape_block_size
* tape
->user_bs_factor
) << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
3526 if (tape
->drv_write_prot
) {
3527 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
3529 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
3533 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
3534 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
3538 if (tape
->chrdev_direction
== idetape_direction_read
)
3539 idetape_discard_read_pipeline(drive
, 1);
3540 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
3544 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t
*drive
);
3547 * Our character device open function.
3549 static int idetape_chrdev_open (struct inode
*inode
, struct file
*filp
)
3551 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
3553 idetape_tape_t
*tape
;
3558 * We really want to do nonseekable_open(inode, filp); here, but some
3559 * versions of tar incorrectly call lseek on tapes and bail out if that
3560 * fails. So we disallow pread() and pwrite(), but permit lseeks.
3562 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
3564 #if IDETAPE_DEBUG_LOG
3565 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_open\n");
3566 #endif /* IDETAPE_DEBUG_LOG */
3568 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
3571 if (!(tape
= ide_tape_chrdev_get(i
)))
3574 drive
= tape
->drive
;
3576 filp
->private_data
= tape
;
3578 if (test_and_set_bit(IDETAPE_BUSY
, &tape
->flags
)) {
3583 retval
= idetape_wait_ready(drive
, 60 * HZ
);
3585 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
3586 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
3590 idetape_read_position(drive
);
3591 if (!test_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
))
3592 (void)idetape_rewind_tape(drive
);
3594 if (tape
->chrdev_direction
!= idetape_direction_read
)
3595 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
3597 /* Read block size and write protect status from drive. */
3598 idetape_get_blocksize_from_block_descriptor(drive
);
3600 /* Set write protect flag if device is opened as read-only. */
3601 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
3602 tape
->write_prot
= 1;
3604 tape
->write_prot
= tape
->drv_write_prot
;
3606 /* Make sure drive isn't write protected if user wants to write. */
3607 if (tape
->write_prot
) {
3608 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
3609 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
3610 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
3617 * Lock the tape drive door so user can't eject.
3619 if (tape
->chrdev_direction
== idetape_direction_none
) {
3620 if (idetape_create_prevent_cmd(drive
, &pc
, 1)) {
3621 if (!idetape_queue_pc_tail(drive
, &pc
)) {
3622 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
3623 tape
->door_locked
= DOOR_LOCKED
;
3627 idetape_restart_speed_control(drive
);
3628 tape
->restart_speed_control_req
= 0;
3636 static void idetape_write_release (ide_drive_t
*drive
, unsigned int minor
)
3638 idetape_tape_t
*tape
= drive
->driver_data
;
3640 idetape_empty_write_pipeline(drive
);
3641 tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 1, 0);
3642 if (tape
->merge_stage
!= NULL
) {
3643 idetape_pad_zeros(drive
, tape
->tape_block_size
* (tape
->user_bs_factor
- 1));
3644 __idetape_kfree_stage(tape
->merge_stage
);
3645 tape
->merge_stage
= NULL
;
3647 idetape_write_filemark(drive
);
3648 idetape_flush_tape_buffers(drive
);
3649 idetape_flush_tape_buffers(drive
);
3653 * Our character device release function.
3655 static int idetape_chrdev_release (struct inode
*inode
, struct file
*filp
)
3657 struct ide_tape_obj
*tape
= ide_tape_f(filp
);
3658 ide_drive_t
*drive
= tape
->drive
;
3660 unsigned int minor
= iminor(inode
);
3663 tape
= drive
->driver_data
;
3664 #if IDETAPE_DEBUG_LOG
3665 if (tape
->debug_level
>= 3)
3666 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_release\n");
3667 #endif /* IDETAPE_DEBUG_LOG */
3669 if (tape
->chrdev_direction
== idetape_direction_write
)
3670 idetape_write_release(drive
, minor
);
3671 if (tape
->chrdev_direction
== idetape_direction_read
) {
3673 idetape_discard_read_pipeline(drive
, 1);
3675 idetape_wait_for_pipeline(drive
);
3677 if (tape
->cache_stage
!= NULL
) {
3678 __idetape_kfree_stage(tape
->cache_stage
);
3679 tape
->cache_stage
= NULL
;
3681 if (minor
< 128 && test_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
))
3682 (void) idetape_rewind_tape(drive
);
3683 if (tape
->chrdev_direction
== idetape_direction_none
) {
3684 if (tape
->door_locked
== DOOR_LOCKED
) {
3685 if (idetape_create_prevent_cmd(drive
, &pc
, 0)) {
3686 if (!idetape_queue_pc_tail(drive
, &pc
))
3687 tape
->door_locked
= DOOR_UNLOCKED
;
3691 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
3698 * idetape_identify_device is called to check the contents of the
3699 * ATAPI IDENTIFY command results. We return:
3701 * 1 If the tape can be supported by us, based on the information
3704 * 0 If this tape driver is not currently supported by us.
3706 static int idetape_identify_device (ide_drive_t
*drive
)
3708 struct idetape_id_gcw gcw
;
3709 struct hd_driveid
*id
= drive
->id
;
3711 if (drive
->id_read
== 0)
3714 *((unsigned short *) &gcw
) = id
->config
;
3716 /* Check that we can support this device */
3718 if (gcw
.protocol
!= 2)
3719 printk(KERN_ERR
"ide-tape: Protocol (0x%02x) is not ATAPI\n",
3721 else if (gcw
.device_type
!= 1)
3722 printk(KERN_ERR
"ide-tape: Device type (0x%02x) is not set "
3723 "to tape\n", gcw
.device_type
);
3724 else if (!gcw
.removable
)
3725 printk(KERN_ERR
"ide-tape: The removable flag is not set\n");
3726 else if (gcw
.packet_size
!= 0) {
3727 printk(KERN_ERR
"ide-tape: Packet size (0x%02x) is not 12 "
3728 "bytes long\n", gcw
.packet_size
);
3734 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
3737 idetape_tape_t
*tape
= drive
->driver_data
;
3740 idetape_create_inquiry_cmd(&pc
);
3741 if (idetape_queue_pc_tail(drive
, &pc
)) {
3742 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
3746 memcpy(tape
->vendor_id
, &pc
.buffer
[8], 8);
3747 memcpy(tape
->product_id
, &pc
.buffer
[16], 16);
3748 memcpy(tape
->firmware_revision
, &pc
.buffer
[32], 4);
3750 ide_fixstring(tape
->vendor_id
, 10, 0);
3751 ide_fixstring(tape
->product_id
, 18, 0);
3752 ide_fixstring(tape
->firmware_revision
, 6, 0);
3753 r
= tape
->firmware_revision
;
3754 if (*(r
+ 1) == '.')
3755 tape
->firmware_revision_num
= (*r
- '0') * 100 +
3756 (*(r
+ 2) - '0') * 10 + *(r
+ 3) - '0';
3757 printk(KERN_INFO
"ide-tape: %s <-> %s: %s %s rev %s\n",
3758 drive
->name
, tape
->name
, tape
->vendor_id
,
3759 tape
->product_id
, tape
->firmware_revision
);
3763 * Ask the tape about its various parameters. In particular, we will adjust our
3764 * data transfer buffer size to the recommended value as returned by the tape.
3766 static void idetape_get_mode_sense_results (ide_drive_t
*drive
)
3768 idetape_tape_t
*tape
= drive
->driver_data
;
3771 u8 speed
, max_speed
;
3773 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
3774 if (idetape_queue_pc_tail(drive
, &pc
)) {
3775 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
3776 " some default values\n");
3777 tape
->tape_block_size
= 512;
3778 put_unaligned(52, (u16
*)&tape
->caps
[12]);
3779 put_unaligned(540, (u16
*)&tape
->caps
[14]);
3780 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
3783 caps
= pc
.buffer
+ 4 + pc
.buffer
[3];
3785 /* convert to host order and save for later use */
3786 speed
= be16_to_cpu(*(u16
*)&caps
[14]);
3787 max_speed
= be16_to_cpu(*(u16
*)&caps
[8]);
3789 put_unaligned(max_speed
, (u16
*)&caps
[8]);
3790 put_unaligned(be16_to_cpu(*(u16
*)&caps
[12]), (u16
*)&caps
[12]);
3791 put_unaligned(speed
, (u16
*)&caps
[14]);
3792 put_unaligned(be16_to_cpu(*(u16
*)&caps
[16]), (u16
*)&caps
[16]);
3795 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
3796 "(assuming 650KB/sec)\n", drive
->name
);
3797 put_unaligned(650, (u16
*)&caps
[14]);
3800 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
3801 "(assuming 650KB/sec)\n", drive
->name
);
3802 put_unaligned(650, (u16
*)&caps
[8]);
3805 memcpy(&tape
->caps
, caps
, 20);
3807 tape
->tape_block_size
= 512;
3808 else if (caps
[7] & 0x04)
3809 tape
->tape_block_size
= 1024;
3813 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor
3814 * and if it succeeds sets the tape block size with the reported value
3816 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t
*drive
)
3819 idetape_tape_t
*tape
= drive
->driver_data
;
3821 idetape_parameter_block_descriptor_t
*block_descrp
;
3823 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
3824 if (idetape_queue_pc_tail(drive
, &pc
)) {
3825 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
3826 if (tape
->tape_block_size
== 0) {
3827 printk(KERN_WARNING
"ide-tape: Cannot deal with zero block size, assume 32k\n");
3828 tape
->tape_block_size
= 32768;
3832 block_descrp
= (idetape_parameter_block_descriptor_t
*)(pc
.buffer
+ 4);
3833 tape
->tape_block_size
=( block_descrp
->length
[0]<<16) + (block_descrp
->length
[1]<<8) + block_descrp
->length
[2];
3834 tape
->drv_write_prot
= (pc
.buffer
[2] & 0x80) >> 7;
3837 #ifdef CONFIG_IDE_PROC_FS
3838 static void idetape_add_settings (ide_drive_t
*drive
)
3840 idetape_tape_t
*tape
= drive
->driver_data
;
3843 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
3845 ide_add_setting(drive
, "buffer", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
3846 1, 2, (u16
*)&tape
->caps
[16], NULL
);
3847 ide_add_setting(drive
, "pipeline_min", SETTING_RW
, TYPE_INT
, 1, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->min_pipeline
, NULL
);
3848 ide_add_setting(drive
, "pipeline", SETTING_RW
, TYPE_INT
, 1, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->max_stages
, NULL
);
3849 ide_add_setting(drive
, "pipeline_max", SETTING_RW
, TYPE_INT
, 1, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->max_pipeline
, NULL
);
3850 ide_add_setting(drive
, "pipeline_used", SETTING_READ
, TYPE_INT
, 0, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->nr_stages
, NULL
);
3851 ide_add_setting(drive
, "pipeline_pending", SETTING_READ
, TYPE_INT
, 0, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->nr_pending_stages
, NULL
);
3852 ide_add_setting(drive
, "speed", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
3853 1, 1, (u16
*)&tape
->caps
[14], NULL
);
3854 ide_add_setting(drive
, "stage", SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1024, &tape
->stage_size
, NULL
);
3855 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
);
3856 ide_add_setting(drive
, "dsc_overlap", SETTING_RW
, TYPE_BYTE
, 0, 1, 1, 1, &drive
->dsc_overlap
, NULL
);
3857 ide_add_setting(drive
, "pipeline_head_speed_c",SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->controlled_pipeline_head_speed
, NULL
);
3858 ide_add_setting(drive
, "pipeline_head_speed_u",SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->uncontrolled_pipeline_head_speed
,NULL
);
3859 ide_add_setting(drive
, "avg_speed", SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->avg_speed
, NULL
);
3860 ide_add_setting(drive
, "debug_level", SETTING_RW
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->debug_level
, NULL
);
3863 static inline void idetape_add_settings(ide_drive_t
*drive
) { ; }
3867 * ide_setup is called to:
3869 * 1. Initialize our various state variables.
3870 * 2. Ask the tape for its capabilities.
3871 * 3. Allocate a buffer which will be used for data
3872 * transfer. The buffer size is chosen based on
3873 * the recommendation which we received in step (2).
3875 * Note that at this point ide.c already assigned us an irq, so that
3876 * we can queue requests here and wait for their completion.
3878 static void idetape_setup (ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
3880 unsigned long t1
, tmid
, tn
, t
;
3882 struct idetape_id_gcw gcw
;
3885 u16
*ctl
= (u16
*)&tape
->caps
[12];
3887 spin_lock_init(&tape
->spinlock
);
3888 drive
->dsc_overlap
= 1;
3889 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
3890 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
3892 drive
->dsc_overlap
= 0;
3894 /* Seagate Travan drives do not support DSC overlap. */
3895 if (strstr(drive
->id
->model
, "Seagate STT3401"))
3896 drive
->dsc_overlap
= 0;
3897 tape
->minor
= minor
;
3898 tape
->name
[0] = 'h';
3899 tape
->name
[1] = 't';
3900 tape
->name
[2] = '0' + minor
;
3901 tape
->chrdev_direction
= idetape_direction_none
;
3902 tape
->pc
= tape
->pc_stack
;
3903 tape
->max_insert_speed
= 10000;
3904 tape
->speed_control
= 1;
3905 *((unsigned short *) &gcw
) = drive
->id
->config
;
3906 if (gcw
.drq_type
== 1)
3907 set_bit(IDETAPE_DRQ_INTERRUPT
, &tape
->flags
);
3909 tape
->min_pipeline
= tape
->max_pipeline
= tape
->max_stages
= 10;
3911 idetape_get_inquiry_results(drive
);
3912 idetape_get_mode_sense_results(drive
);
3913 idetape_get_blocksize_from_block_descriptor(drive
);
3914 tape
->user_bs_factor
= 1;
3915 tape
->stage_size
= *ctl
* tape
->tape_block_size
;
3916 while (tape
->stage_size
> 0xffff) {
3917 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
3919 tape
->stage_size
= *ctl
* tape
->tape_block_size
;
3921 stage_size
= tape
->stage_size
;
3922 tape
->pages_per_stage
= stage_size
/ PAGE_SIZE
;
3923 if (stage_size
% PAGE_SIZE
) {
3924 tape
->pages_per_stage
++;
3925 tape
->excess_bh_size
= PAGE_SIZE
- stage_size
% PAGE_SIZE
;
3928 /* Select the "best" DSC read/write polling freq and pipeline size. */
3929 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
3931 tape
->max_stages
= speed
* 1000 * 10 / tape
->stage_size
;
3934 * Limit memory use for pipeline to 10% of physical memory
3937 if (tape
->max_stages
* tape
->stage_size
> si
.totalram
* si
.mem_unit
/ 10)
3938 tape
->max_stages
= si
.totalram
* si
.mem_unit
/ (10 * tape
->stage_size
);
3939 tape
->max_stages
= min(tape
->max_stages
, IDETAPE_MAX_PIPELINE_STAGES
);
3940 tape
->min_pipeline
= min(tape
->max_stages
, IDETAPE_MIN_PIPELINE_STAGES
);
3941 tape
->max_pipeline
= min(tape
->max_stages
* 2, IDETAPE_MAX_PIPELINE_STAGES
);
3942 if (tape
->max_stages
== 0)
3943 tape
->max_stages
= tape
->min_pipeline
= tape
->max_pipeline
= 1;
3945 t1
= (tape
->stage_size
* HZ
) / (speed
* 1000);
3946 tmid
= (*(u16
*)&tape
->caps
[16] * 32 * HZ
) / (speed
* 125);
3947 tn
= (IDETAPE_FIFO_THRESHOLD
* tape
->stage_size
* HZ
) / (speed
* 1000);
3949 if (tape
->max_stages
)
3955 * Ensure that the number we got makes sense; limit
3956 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
3958 tape
->best_dsc_rw_frequency
= max_t(unsigned long, min_t(unsigned long, t
, IDETAPE_DSC_RW_MAX
), IDETAPE_DSC_RW_MIN
);
3959 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
3960 "%dkB pipeline, %lums tDSC%s\n",
3961 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
3962 (*(u16
*)&tape
->caps
[16] * 512) / tape
->stage_size
,
3963 tape
->stage_size
/ 1024,
3964 tape
->max_stages
* tape
->stage_size
/ 1024,
3965 tape
->best_dsc_rw_frequency
* 1000 / HZ
,
3966 drive
->using_dma
? ", DMA":"");
3968 idetape_add_settings(drive
);
3971 static void ide_tape_remove(ide_drive_t
*drive
)
3973 idetape_tape_t
*tape
= drive
->driver_data
;
3975 ide_proc_unregister_driver(drive
, tape
->driver
);
3977 ide_unregister_region(tape
->disk
);
3982 static void ide_tape_release(struct kref
*kref
)
3984 struct ide_tape_obj
*tape
= to_ide_tape(kref
);
3985 ide_drive_t
*drive
= tape
->drive
;
3986 struct gendisk
*g
= tape
->disk
;
3988 BUG_ON(tape
->first_stage
!= NULL
|| tape
->merge_stage_size
);
3990 drive
->dsc_overlap
= 0;
3991 drive
->driver_data
= NULL
;
3992 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
3993 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
3994 idetape_devs
[tape
->minor
] = NULL
;
3995 g
->private_data
= NULL
;
4000 #ifdef CONFIG_IDE_PROC_FS
4001 static int proc_idetape_read_name
4002 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
4004 ide_drive_t
*drive
= (ide_drive_t
*) data
;
4005 idetape_tape_t
*tape
= drive
->driver_data
;
4009 len
= sprintf(out
, "%s\n", tape
->name
);
4010 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
4013 static ide_proc_entry_t idetape_proc
[] = {
4014 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
4015 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
4016 { NULL
, 0, NULL
, NULL
}
4020 static int ide_tape_probe(ide_drive_t
*);
4022 static ide_driver_t idetape_driver
= {
4024 .owner
= THIS_MODULE
,
4026 .bus
= &ide_bus_type
,
4028 .probe
= ide_tape_probe
,
4029 .remove
= ide_tape_remove
,
4030 .version
= IDETAPE_VERSION
,
4032 .supports_dsc_overlap
= 1,
4033 .do_request
= idetape_do_request
,
4034 .end_request
= idetape_end_request
,
4035 .error
= __ide_error
,
4036 .abort
= __ide_abort
,
4037 #ifdef CONFIG_IDE_PROC_FS
4038 .proc
= idetape_proc
,
4043 * Our character device supporting functions, passed to register_chrdev.
4045 static const struct file_operations idetape_fops
= {
4046 .owner
= THIS_MODULE
,
4047 .read
= idetape_chrdev_read
,
4048 .write
= idetape_chrdev_write
,
4049 .ioctl
= idetape_chrdev_ioctl
,
4050 .open
= idetape_chrdev_open
,
4051 .release
= idetape_chrdev_release
,
4054 static int idetape_open(struct inode
*inode
, struct file
*filp
)
4056 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
4057 struct ide_tape_obj
*tape
;
4059 if (!(tape
= ide_tape_get(disk
)))
4065 static int idetape_release(struct inode
*inode
, struct file
*filp
)
4067 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
4068 struct ide_tape_obj
*tape
= ide_tape_g(disk
);
4075 static int idetape_ioctl(struct inode
*inode
, struct file
*file
,
4076 unsigned int cmd
, unsigned long arg
)
4078 struct block_device
*bdev
= inode
->i_bdev
;
4079 struct ide_tape_obj
*tape
= ide_tape_g(bdev
->bd_disk
);
4080 ide_drive_t
*drive
= tape
->drive
;
4081 int err
= generic_ide_ioctl(drive
, file
, bdev
, cmd
, arg
);
4083 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
4087 static struct block_device_operations idetape_block_ops
= {
4088 .owner
= THIS_MODULE
,
4089 .open
= idetape_open
,
4090 .release
= idetape_release
,
4091 .ioctl
= idetape_ioctl
,
4094 static int ide_tape_probe(ide_drive_t
*drive
)
4096 idetape_tape_t
*tape
;
4100 if (!strstr("ide-tape", drive
->driver_req
))
4102 if (!drive
->present
)
4104 if (drive
->media
!= ide_tape
)
4106 if (!idetape_identify_device (drive
)) {
4107 printk(KERN_ERR
"ide-tape: %s: not supported by this version of ide-tape\n", drive
->name
);
4111 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive
->name
);
4114 if (strstr(drive
->id
->model
, "OnStream DI-")) {
4115 printk(KERN_WARNING
"ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive
->name
);
4116 printk(KERN_WARNING
"ide-tape: OnStream support will be removed soon from ide-tape!\n");
4118 tape
= kzalloc(sizeof (idetape_tape_t
), GFP_KERNEL
);
4120 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape structure\n", drive
->name
);
4124 g
= alloc_disk(1 << PARTN_BITS
);
4128 ide_init_disk(g
, drive
);
4130 ide_proc_register_driver(drive
, &idetape_driver
);
4132 kref_init(&tape
->kref
);
4134 tape
->drive
= drive
;
4135 tape
->driver
= &idetape_driver
;
4138 g
->private_data
= &tape
->driver
;
4140 drive
->driver_data
= tape
;
4142 mutex_lock(&idetape_ref_mutex
);
4143 for (minor
= 0; idetape_devs
[minor
]; minor
++)
4145 idetape_devs
[minor
] = tape
;
4146 mutex_unlock(&idetape_ref_mutex
);
4148 idetape_setup(drive
, tape
, minor
);
4150 device_create(idetape_sysfs_class
, &drive
->gendev
,
4151 MKDEV(IDETAPE_MAJOR
, minor
), "%s", tape
->name
);
4152 device_create(idetape_sysfs_class
, &drive
->gendev
,
4153 MKDEV(IDETAPE_MAJOR
, minor
+ 128), "n%s", tape
->name
);
4155 g
->fops
= &idetape_block_ops
;
4156 ide_register_region(g
);
4166 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
4167 MODULE_LICENSE("GPL");
4169 static void __exit
idetape_exit (void)
4171 driver_unregister(&idetape_driver
.gen_driver
);
4172 class_destroy(idetape_sysfs_class
);
4173 unregister_chrdev(IDETAPE_MAJOR
, "ht");
4176 static int __init
idetape_init(void)
4179 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
4180 if (IS_ERR(idetape_sysfs_class
)) {
4181 idetape_sysfs_class
= NULL
;
4182 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
4187 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
4188 printk(KERN_ERR
"ide-tape: Failed to register character device interface\n");
4190 goto out_free_class
;
4193 error
= driver_register(&idetape_driver
.gen_driver
);
4195 goto out_free_driver
;
4200 driver_unregister(&idetape_driver
.gen_driver
);
4202 class_destroy(idetape_sysfs_class
);
4207 MODULE_ALIAS("ide:*m-tape*");
4208 module_init(idetape_init
);
4209 module_exit(idetape_exit
);
4210 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);