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 * Run time configurable parameters.
696 int dsc_rw_frequency
;
697 int dsc_media_access_frequency
;
702 * The variables below are used for the character device interface.
703 * Additional state variables are defined in our ide_drive_t structure.
705 static struct ide_tape_obj
* idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
707 #define ide_tape_f(file) ((file)->private_data)
709 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
711 struct ide_tape_obj
*tape
= NULL
;
713 mutex_lock(&idetape_ref_mutex
);
714 tape
= idetape_devs
[i
];
716 kref_get(&tape
->kref
);
717 mutex_unlock(&idetape_ref_mutex
);
722 * Function declarations
725 static int idetape_chrdev_release (struct inode
*inode
, struct file
*filp
);
726 static void idetape_write_release (ide_drive_t
*drive
, unsigned int minor
);
729 * Too bad. The drive wants to send us data which we are not ready to accept.
730 * Just throw it away.
732 static void idetape_discard_data (ide_drive_t
*drive
, unsigned int bcount
)
735 (void) HWIF(drive
)->INB(IDE_DATA_REG
);
738 static void idetape_input_buffers (ide_drive_t
*drive
, idetape_pc_t
*pc
, unsigned int bcount
)
740 struct idetape_bh
*bh
= pc
->bh
;
745 printk(KERN_ERR
"ide-tape: bh == NULL in "
746 "idetape_input_buffers\n");
747 idetape_discard_data(drive
, bcount
);
750 count
= min((unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)), bcount
);
751 HWIF(drive
)->atapi_input_bytes(drive
, bh
->b_data
+ atomic_read(&bh
->b_count
), count
);
753 atomic_add(count
, &bh
->b_count
);
754 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
757 atomic_set(&bh
->b_count
, 0);
763 static void idetape_output_buffers (ide_drive_t
*drive
, idetape_pc_t
*pc
, unsigned int bcount
)
765 struct idetape_bh
*bh
= pc
->bh
;
770 printk(KERN_ERR
"ide-tape: bh == NULL in "
771 "idetape_output_buffers\n");
774 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
775 HWIF(drive
)->atapi_output_bytes(drive
, pc
->b_data
, count
);
778 pc
->b_count
-= count
;
780 pc
->bh
= bh
= bh
->b_reqnext
;
782 pc
->b_data
= bh
->b_data
;
783 pc
->b_count
= atomic_read(&bh
->b_count
);
789 static void idetape_update_buffers (idetape_pc_t
*pc
)
791 struct idetape_bh
*bh
= pc
->bh
;
793 unsigned int bcount
= pc
->actually_transferred
;
795 if (test_bit(PC_WRITING
, &pc
->flags
))
799 printk(KERN_ERR
"ide-tape: bh == NULL in "
800 "idetape_update_buffers\n");
803 count
= min((unsigned int)bh
->b_size
, (unsigned int)bcount
);
804 atomic_set(&bh
->b_count
, count
);
805 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
813 * idetape_next_pc_storage returns a pointer to a place in which we can
814 * safely store a packet command, even though we intend to leave the
815 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
816 * commands is allocated at initialization time.
818 static idetape_pc_t
*idetape_next_pc_storage (ide_drive_t
*drive
)
820 idetape_tape_t
*tape
= drive
->driver_data
;
822 #if IDETAPE_DEBUG_LOG
823 if (tape
->debug_level
>= 5)
824 printk(KERN_INFO
"ide-tape: pc_stack_index=%d\n",
825 tape
->pc_stack_index
);
826 #endif /* IDETAPE_DEBUG_LOG */
827 if (tape
->pc_stack_index
== IDETAPE_PC_STACK
)
828 tape
->pc_stack_index
=0;
829 return (&tape
->pc_stack
[tape
->pc_stack_index
++]);
833 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
834 * Since we queue packet commands in the request queue, we need to
835 * allocate a request, along with the allocation of a packet command.
838 /**************************************************************
840 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
841 * followed later on by kfree(). -ml *
843 **************************************************************/
845 static struct request
*idetape_next_rq_storage (ide_drive_t
*drive
)
847 idetape_tape_t
*tape
= drive
->driver_data
;
849 #if IDETAPE_DEBUG_LOG
850 if (tape
->debug_level
>= 5)
851 printk(KERN_INFO
"ide-tape: rq_stack_index=%d\n",
852 tape
->rq_stack_index
);
853 #endif /* IDETAPE_DEBUG_LOG */
854 if (tape
->rq_stack_index
== IDETAPE_PC_STACK
)
855 tape
->rq_stack_index
=0;
856 return (&tape
->rq_stack
[tape
->rq_stack_index
++]);
860 * idetape_init_pc initializes a packet command.
862 static void idetape_init_pc (idetape_pc_t
*pc
)
864 memset(pc
->c
, 0, 12);
867 pc
->request_transfer
= 0;
868 pc
->buffer
= pc
->pc_buffer
;
869 pc
->buffer_size
= IDETAPE_PC_BUFFER_SIZE
;
875 * called on each failed packet command retry to analyze the request sense. We
876 * currently do not utilize this information.
878 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
880 idetape_tape_t
*tape
= drive
->driver_data
;
881 idetape_pc_t
*pc
= tape
->failed_pc
;
883 tape
->sense_key
= sense
[2] & 0xF;
884 tape
->asc
= sense
[12];
885 tape
->ascq
= sense
[13];
886 #if IDETAPE_DEBUG_LOG
888 * Without debugging, we only log an error if we decided to give up
891 if (tape
->debug_level
>= 1)
892 printk(KERN_INFO
"ide-tape: pc = %x, sense key = %x, "
893 "asc = %x, ascq = %x\n",
894 pc
->c
[0], tape
->sense_key
,
895 tape
->asc
, tape
->ascq
);
896 #endif /* IDETAPE_DEBUG_LOG */
898 /* Correct pc->actually_transferred by asking the tape. */
899 if (test_bit(PC_DMA_ERROR
, &pc
->flags
)) {
900 pc
->actually_transferred
= pc
->request_transfer
-
901 tape
->tape_block_size
*
902 ntohl(get_unaligned((u32
*)&sense
[3]));
903 idetape_update_buffers(pc
);
907 * If error was the result of a zero-length read or write command,
908 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
909 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
911 if ((pc
->c
[0] == IDETAPE_READ_CMD
|| pc
->c
[0] == IDETAPE_WRITE_CMD
)
913 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
914 if (tape
->sense_key
== 5) {
915 /* don't report an error, everything's ok */
917 /* don't retry read/write */
918 set_bit(PC_ABORT
, &pc
->flags
);
921 if (pc
->c
[0] == IDETAPE_READ_CMD
&& (sense
[2] & 0x80)) {
922 pc
->error
= IDETAPE_ERROR_FILEMARK
;
923 set_bit(PC_ABORT
, &pc
->flags
);
925 if (pc
->c
[0] == IDETAPE_WRITE_CMD
) {
926 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
927 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
928 pc
->error
= IDETAPE_ERROR_EOD
;
929 set_bit(PC_ABORT
, &pc
->flags
);
932 if (pc
->c
[0] == IDETAPE_READ_CMD
|| pc
->c
[0] == IDETAPE_WRITE_CMD
) {
933 if (tape
->sense_key
== 8) {
934 pc
->error
= IDETAPE_ERROR_EOD
;
935 set_bit(PC_ABORT
, &pc
->flags
);
937 if (!test_bit(PC_ABORT
, &pc
->flags
) &&
938 pc
->actually_transferred
)
939 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
944 * idetape_active_next_stage will declare the next stage as "active".
946 static void idetape_active_next_stage (ide_drive_t
*drive
)
948 idetape_tape_t
*tape
= drive
->driver_data
;
949 idetape_stage_t
*stage
= tape
->next_stage
;
950 struct request
*rq
= &stage
->rq
;
952 #if IDETAPE_DEBUG_LOG
953 if (tape
->debug_level
>= 4)
954 printk(KERN_INFO
"ide-tape: Reached idetape_active_next_stage\n");
955 #endif /* IDETAPE_DEBUG_LOG */
957 printk(KERN_ERR
"ide-tape: bug: Trying to activate a non existing stage\n");
961 rq
->rq_disk
= tape
->disk
;
963 rq
->special
= (void *)stage
->bh
;
964 tape
->active_data_request
= rq
;
965 tape
->active_stage
= stage
;
966 tape
->next_stage
= stage
->next
;
970 * idetape_increase_max_pipeline_stages is a part of the feedback
971 * loop which tries to find the optimum number of stages. In the
972 * feedback loop, we are starting from a minimum maximum number of
973 * stages, and if we sense that the pipeline is empty, we try to
974 * increase it, until we reach the user compile time memory limit.
976 static void idetape_increase_max_pipeline_stages (ide_drive_t
*drive
)
978 idetape_tape_t
*tape
= drive
->driver_data
;
979 int increase
= (tape
->max_pipeline
- tape
->min_pipeline
) / 10;
981 #if IDETAPE_DEBUG_LOG
982 if (tape
->debug_level
>= 4)
983 printk (KERN_INFO
"ide-tape: Reached idetape_increase_max_pipeline_stages\n");
984 #endif /* IDETAPE_DEBUG_LOG */
986 tape
->max_stages
+= max(increase
, 1);
987 tape
->max_stages
= max(tape
->max_stages
, tape
->min_pipeline
);
988 tape
->max_stages
= min(tape
->max_stages
, tape
->max_pipeline
);
992 * idetape_kfree_stage calls kfree to completely free a stage, along with
993 * its related buffers.
995 static void __idetape_kfree_stage (idetape_stage_t
*stage
)
997 struct idetape_bh
*prev_bh
, *bh
= stage
->bh
;
1000 while (bh
!= NULL
) {
1001 if (bh
->b_data
!= NULL
) {
1002 size
= (int) bh
->b_size
;
1004 free_page((unsigned long) bh
->b_data
);
1006 bh
->b_data
+= PAGE_SIZE
;
1016 static void idetape_kfree_stage (idetape_tape_t
*tape
, idetape_stage_t
*stage
)
1018 __idetape_kfree_stage(stage
);
1022 * idetape_remove_stage_head removes tape->first_stage from the pipeline.
1023 * The caller should avoid race conditions.
1025 static void idetape_remove_stage_head (ide_drive_t
*drive
)
1027 idetape_tape_t
*tape
= drive
->driver_data
;
1028 idetape_stage_t
*stage
;
1030 #if IDETAPE_DEBUG_LOG
1031 if (tape
->debug_level
>= 4)
1032 printk(KERN_INFO
"ide-tape: Reached idetape_remove_stage_head\n");
1033 #endif /* IDETAPE_DEBUG_LOG */
1034 if (tape
->first_stage
== NULL
) {
1035 printk(KERN_ERR
"ide-tape: bug: tape->first_stage is NULL\n");
1038 if (tape
->active_stage
== tape
->first_stage
) {
1039 printk(KERN_ERR
"ide-tape: bug: Trying to free our active pipeline stage\n");
1042 stage
= tape
->first_stage
;
1043 tape
->first_stage
= stage
->next
;
1044 idetape_kfree_stage(tape
, stage
);
1046 if (tape
->first_stage
== NULL
) {
1047 tape
->last_stage
= NULL
;
1048 if (tape
->next_stage
!= NULL
)
1049 printk(KERN_ERR
"ide-tape: bug: tape->next_stage != NULL\n");
1050 if (tape
->nr_stages
)
1051 printk(KERN_ERR
"ide-tape: bug: nr_stages should be 0 now\n");
1056 * This will free all the pipeline stages starting from new_last_stage->next
1057 * to the end of the list, and point tape->last_stage to new_last_stage.
1059 static void idetape_abort_pipeline(ide_drive_t
*drive
,
1060 idetape_stage_t
*new_last_stage
)
1062 idetape_tape_t
*tape
= drive
->driver_data
;
1063 idetape_stage_t
*stage
= new_last_stage
->next
;
1064 idetape_stage_t
*nstage
;
1066 #if IDETAPE_DEBUG_LOG
1067 if (tape
->debug_level
>= 4)
1068 printk(KERN_INFO
"ide-tape: %s: idetape_abort_pipeline called\n", tape
->name
);
1071 nstage
= stage
->next
;
1072 idetape_kfree_stage(tape
, stage
);
1074 --tape
->nr_pending_stages
;
1078 new_last_stage
->next
= NULL
;
1079 tape
->last_stage
= new_last_stage
;
1080 tape
->next_stage
= NULL
;
1084 * idetape_end_request is used to finish servicing a request, and to
1085 * insert a pending pipeline request into the main device queue.
1087 static int idetape_end_request(ide_drive_t
*drive
, int uptodate
, int nr_sects
)
1089 struct request
*rq
= HWGROUP(drive
)->rq
;
1090 idetape_tape_t
*tape
= drive
->driver_data
;
1091 unsigned long flags
;
1093 int remove_stage
= 0;
1094 idetape_stage_t
*active_stage
;
1096 #if IDETAPE_DEBUG_LOG
1097 if (tape
->debug_level
>= 4)
1098 printk(KERN_INFO
"ide-tape: Reached idetape_end_request\n");
1099 #endif /* IDETAPE_DEBUG_LOG */
1102 case 0: error
= IDETAPE_ERROR_GENERAL
; break;
1103 case 1: error
= 0; break;
1104 default: error
= uptodate
;
1108 tape
->failed_pc
= NULL
;
1110 if (!blk_special_request(rq
)) {
1111 ide_end_request(drive
, uptodate
, nr_sects
);
1115 spin_lock_irqsave(&tape
->spinlock
, flags
);
1117 /* The request was a pipelined data transfer request */
1118 if (tape
->active_data_request
== rq
) {
1119 active_stage
= tape
->active_stage
;
1120 tape
->active_stage
= NULL
;
1121 tape
->active_data_request
= NULL
;
1122 tape
->nr_pending_stages
--;
1123 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1126 set_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
1127 if (error
== IDETAPE_ERROR_EOD
)
1128 idetape_abort_pipeline(drive
, active_stage
);
1130 } else if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1131 if (error
== IDETAPE_ERROR_EOD
) {
1132 set_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
1133 idetape_abort_pipeline(drive
, active_stage
);
1136 if (tape
->next_stage
!= NULL
) {
1137 idetape_active_next_stage(drive
);
1140 * Insert the next request into the request queue.
1142 (void) ide_do_drive_cmd(drive
, tape
->active_data_request
, ide_end
);
1143 } else if (!error
) {
1144 idetape_increase_max_pipeline_stages(drive
);
1147 ide_end_drive_cmd(drive
, 0, 0);
1148 // blkdev_dequeue_request(rq);
1149 // drive->rq = NULL;
1150 // end_that_request_last(rq);
1153 idetape_remove_stage_head(drive
);
1154 if (tape
->active_data_request
== NULL
)
1155 clear_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
1156 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
1160 static ide_startstop_t
idetape_request_sense_callback (ide_drive_t
*drive
)
1162 idetape_tape_t
*tape
= drive
->driver_data
;
1164 #if IDETAPE_DEBUG_LOG
1165 if (tape
->debug_level
>= 4)
1166 printk(KERN_INFO
"ide-tape: Reached idetape_request_sense_callback\n");
1167 #endif /* IDETAPE_DEBUG_LOG */
1168 if (!tape
->pc
->error
) {
1169 idetape_analyze_error(drive
, tape
->pc
->buffer
);
1170 idetape_end_request(drive
, 1, 0);
1172 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
1173 idetape_end_request(drive
, 0, 0);
1178 static void idetape_create_request_sense_cmd (idetape_pc_t
*pc
)
1180 idetape_init_pc(pc
);
1181 pc
->c
[0] = IDETAPE_REQUEST_SENSE_CMD
;
1183 pc
->request_transfer
= 20;
1184 pc
->callback
= &idetape_request_sense_callback
;
1187 static void idetape_init_rq(struct request
*rq
, u8 cmd
)
1189 memset(rq
, 0, sizeof(*rq
));
1190 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1195 * idetape_queue_pc_head generates a new packet command request in front
1196 * of the request queue, before the current request, so that it will be
1197 * processed immediately, on the next pass through the driver.
1199 * idetape_queue_pc_head is called from the request handling part of
1200 * the driver (the "bottom" part). Safe storage for the request should
1201 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
1202 * before calling idetape_queue_pc_head.
1204 * Memory for those requests is pre-allocated at initialization time, and
1205 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
1206 * space for the maximum possible number of inter-dependent packet commands.
1208 * The higher level of the driver - The ioctl handler and the character
1209 * device handling functions should queue request to the lower level part
1210 * and wait for their completion using idetape_queue_pc_tail or
1211 * idetape_queue_rw_tail.
1213 static void idetape_queue_pc_head (ide_drive_t
*drive
, idetape_pc_t
*pc
,struct request
*rq
)
1215 struct ide_tape_obj
*tape
= drive
->driver_data
;
1217 idetape_init_rq(rq
, REQ_IDETAPE_PC1
);
1218 rq
->buffer
= (char *) pc
;
1219 rq
->rq_disk
= tape
->disk
;
1220 (void) ide_do_drive_cmd(drive
, rq
, ide_preempt
);
1224 * idetape_retry_pc is called when an error was detected during the
1225 * last packet command. We queue a request sense packet command in
1226 * the head of the request list.
1228 static ide_startstop_t
idetape_retry_pc (ide_drive_t
*drive
)
1230 idetape_tape_t
*tape
= drive
->driver_data
;
1234 (void)drive
->hwif
->INB(IDE_ERROR_REG
);
1235 pc
= idetape_next_pc_storage(drive
);
1236 rq
= idetape_next_rq_storage(drive
);
1237 idetape_create_request_sense_cmd(pc
);
1238 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
1239 idetape_queue_pc_head(drive
, pc
, rq
);
1244 * idetape_postpone_request postpones the current request so that
1245 * ide.c will be able to service requests from another device on
1246 * the same hwgroup while we are polling for DSC.
1248 static void idetape_postpone_request (ide_drive_t
*drive
)
1250 idetape_tape_t
*tape
= drive
->driver_data
;
1252 #if IDETAPE_DEBUG_LOG
1253 if (tape
->debug_level
>= 4)
1254 printk(KERN_INFO
"ide-tape: idetape_postpone_request\n");
1256 tape
->postponed_rq
= HWGROUP(drive
)->rq
;
1257 ide_stall_queue(drive
, tape
->dsc_polling_frequency
);
1261 * idetape_pc_intr is the usual interrupt handler which will be called
1262 * during a packet command. We will transfer some of the data (as
1263 * requested by the drive) and will re-point interrupt handler to us.
1264 * When data transfer is finished, we will act according to the
1265 * algorithm described before idetape_issue_packet_command.
1268 static ide_startstop_t
idetape_pc_intr (ide_drive_t
*drive
)
1270 ide_hwif_t
*hwif
= drive
->hwif
;
1271 idetape_tape_t
*tape
= drive
->driver_data
;
1272 idetape_pc_t
*pc
= tape
->pc
;
1275 static int error_sim_count
= 0;
1280 #if IDETAPE_DEBUG_LOG
1281 if (tape
->debug_level
>= 4)
1282 printk(KERN_INFO
"ide-tape: Reached idetape_pc_intr "
1283 "interrupt handler\n");
1284 #endif /* IDETAPE_DEBUG_LOG */
1286 /* Clear the interrupt */
1287 stat
= hwif
->INB(IDE_STATUS_REG
);
1289 if (test_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
)) {
1290 if (hwif
->ide_dma_end(drive
) || (stat
& ERR_STAT
)) {
1292 * A DMA error is sometimes expected. For example,
1293 * if the tape is crossing a filemark during a
1294 * READ command, it will issue an irq and position
1295 * itself before the filemark, so that only a partial
1296 * data transfer will occur (which causes the DMA
1297 * error). In that case, we will later ask the tape
1298 * how much bytes of the original request were
1299 * actually transferred (we can't receive that
1300 * information from the DMA engine on most chipsets).
1304 * On the contrary, a DMA error is never expected;
1305 * it usually indicates a hardware error or abort.
1306 * If the tape crosses a filemark during a READ
1307 * command, it will issue an irq and position itself
1308 * after the filemark (not before). Only a partial
1309 * data transfer will occur, but no DMA error.
1312 set_bit(PC_DMA_ERROR
, &pc
->flags
);
1314 pc
->actually_transferred
= pc
->request_transfer
;
1315 idetape_update_buffers(pc
);
1317 #if IDETAPE_DEBUG_LOG
1318 if (tape
->debug_level
>= 4)
1319 printk(KERN_INFO
"ide-tape: DMA finished\n");
1320 #endif /* IDETAPE_DEBUG_LOG */
1323 /* No more interrupts */
1324 if ((stat
& DRQ_STAT
) == 0) {
1325 #if IDETAPE_DEBUG_LOG
1326 if (tape
->debug_level
>= 2)
1327 printk(KERN_INFO
"ide-tape: Packet command completed, %d bytes transferred\n", pc
->actually_transferred
);
1328 #endif /* IDETAPE_DEBUG_LOG */
1329 clear_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
);
1334 if ((pc
->c
[0] == IDETAPE_WRITE_CMD
||
1335 pc
->c
[0] == IDETAPE_READ_CMD
) &&
1336 (++error_sim_count
% 100) == 0) {
1337 printk(KERN_INFO
"ide-tape: %s: simulating error\n",
1342 if ((stat
& ERR_STAT
) && pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
)
1344 if ((stat
& ERR_STAT
) || test_bit(PC_DMA_ERROR
, &pc
->flags
)) {
1345 /* Error detected */
1346 #if IDETAPE_DEBUG_LOG
1347 if (tape
->debug_level
>= 1)
1348 printk(KERN_INFO
"ide-tape: %s: I/O error\n",
1350 #endif /* IDETAPE_DEBUG_LOG */
1351 if (pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
) {
1352 printk(KERN_ERR
"ide-tape: I/O error in request sense command\n");
1353 return ide_do_reset(drive
);
1355 #if IDETAPE_DEBUG_LOG
1356 if (tape
->debug_level
>= 1)
1357 printk(KERN_INFO
"ide-tape: [cmd %x]: check condition\n", pc
->c
[0]);
1359 /* Retry operation */
1360 return idetape_retry_pc(drive
);
1363 if (test_bit(PC_WAIT_FOR_DSC
, &pc
->flags
) &&
1364 (stat
& SEEK_STAT
) == 0) {
1365 /* Media access command */
1366 tape
->dsc_polling_start
= jiffies
;
1367 tape
->dsc_polling_frequency
= IDETAPE_DSC_MA_FAST
;
1368 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
1369 /* Allow ide.c to handle other requests */
1370 idetape_postpone_request(drive
);
1373 if (tape
->failed_pc
== pc
)
1374 tape
->failed_pc
= NULL
;
1375 /* Command finished - Call the callback function */
1376 return pc
->callback(drive
);
1378 if (test_and_clear_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
)) {
1379 printk(KERN_ERR
"ide-tape: The tape wants to issue more "
1380 "interrupts in DMA mode\n");
1381 printk(KERN_ERR
"ide-tape: DMA disabled, reverting to PIO\n");
1383 return ide_do_reset(drive
);
1385 /* Get the number of bytes to transfer on this interrupt. */
1386 bcount
= (hwif
->INB(IDE_BCOUNTH_REG
) << 8) |
1387 hwif
->INB(IDE_BCOUNTL_REG
);
1389 ireason
= hwif
->INB(IDE_IREASON_REG
);
1392 printk(KERN_ERR
"ide-tape: CoD != 0 in idetape_pc_intr\n");
1393 return ide_do_reset(drive
);
1395 if (((ireason
& IO
) == IO
) == test_bit(PC_WRITING
, &pc
->flags
)) {
1396 /* Hopefully, we will never get here */
1397 printk(KERN_ERR
"ide-tape: We wanted to %s, ",
1398 (ireason
& IO
) ? "Write" : "Read");
1399 printk(KERN_ERR
"ide-tape: but the tape wants us to %s !\n",
1400 (ireason
& IO
) ? "Read" : "Write");
1401 return ide_do_reset(drive
);
1403 if (!test_bit(PC_WRITING
, &pc
->flags
)) {
1404 /* Reading - Check that we have enough space */
1405 temp
= pc
->actually_transferred
+ bcount
;
1406 if (temp
> pc
->request_transfer
) {
1407 if (temp
> pc
->buffer_size
) {
1408 printk(KERN_ERR
"ide-tape: The tape wants to send us more data than expected - discarding data\n");
1409 idetape_discard_data(drive
, bcount
);
1410 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1413 #if IDETAPE_DEBUG_LOG
1414 if (tape
->debug_level
>= 2)
1415 printk(KERN_NOTICE
"ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
1416 #endif /* IDETAPE_DEBUG_LOG */
1419 if (test_bit(PC_WRITING
, &pc
->flags
)) {
1421 idetape_output_buffers(drive
, pc
, bcount
);
1423 /* Write the current buffer */
1424 hwif
->atapi_output_bytes(drive
, pc
->current_position
,
1428 idetape_input_buffers(drive
, pc
, bcount
);
1430 /* Read the current buffer */
1431 hwif
->atapi_input_bytes(drive
, pc
->current_position
,
1434 /* Update the current position */
1435 pc
->actually_transferred
+= bcount
;
1436 pc
->current_position
+= bcount
;
1437 #if IDETAPE_DEBUG_LOG
1438 if (tape
->debug_level
>= 2)
1439 printk(KERN_INFO
"ide-tape: [cmd %x] transferred %d bytes "
1440 "on that interrupt\n", pc
->c
[0], bcount
);
1442 /* And set the interrupt handler again */
1443 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1448 * Packet Command Interface
1450 * The current Packet Command is available in tape->pc, and will not
1451 * change until we finish handling it. Each packet command is associated
1452 * with a callback function that will be called when the command is
1455 * The handling will be done in three stages:
1457 * 1. idetape_issue_packet_command will send the packet command to the
1458 * drive, and will set the interrupt handler to idetape_pc_intr.
1460 * 2. On each interrupt, idetape_pc_intr will be called. This step
1461 * will be repeated until the device signals us that no more
1462 * interrupts will be issued.
1464 * 3. ATAPI Tape media access commands have immediate status with a
1465 * delayed process. In case of a successful initiation of a
1466 * media access packet command, the DSC bit will be set when the
1467 * actual execution of the command is finished.
1468 * Since the tape drive will not issue an interrupt, we have to
1469 * poll for this event. In this case, we define the request as
1470 * "low priority request" by setting rq_status to
1471 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
1474 * ide.c will then give higher priority to requests which
1475 * originate from the other device, until will change rq_status
1478 * 4. When the packet command is finished, it will be checked for errors.
1480 * 5. In case an error was found, we queue a request sense packet
1481 * command in front of the request queue and retry the operation
1482 * up to IDETAPE_MAX_PC_RETRIES times.
1484 * 6. In case no error was found, or we decided to give up and not
1485 * to retry again, the callback function will be called and then
1486 * we will handle the next request.
1489 static ide_startstop_t
idetape_transfer_pc(ide_drive_t
*drive
)
1491 ide_hwif_t
*hwif
= drive
->hwif
;
1492 idetape_tape_t
*tape
= drive
->driver_data
;
1493 idetape_pc_t
*pc
= tape
->pc
;
1495 ide_startstop_t startstop
;
1498 if (ide_wait_stat(&startstop
,drive
,DRQ_STAT
,BUSY_STAT
,WAIT_READY
)) {
1499 printk(KERN_ERR
"ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
1502 ireason
= hwif
->INB(IDE_IREASON_REG
);
1503 while (retries
-- && ((ireason
& CD
) == 0 || (ireason
& IO
))) {
1504 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while issuing "
1505 "a packet command, retrying\n");
1507 ireason
= hwif
->INB(IDE_IREASON_REG
);
1509 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while "
1510 "issuing a packet command, ignoring\n");
1515 if ((ireason
& CD
) == 0 || (ireason
& IO
)) {
1516 printk(KERN_ERR
"ide-tape: (IO,CoD) != (0,1) while issuing "
1517 "a packet command\n");
1518 return ide_do_reset(drive
);
1520 /* Set the interrupt routine */
1521 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1522 #ifdef CONFIG_BLK_DEV_IDEDMA
1523 /* Begin DMA, if necessary */
1524 if (test_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
))
1525 hwif
->dma_start(drive
);
1527 /* Send the actual packet */
1528 HWIF(drive
)->atapi_output_bytes(drive
, pc
->c
, 12);
1532 static ide_startstop_t
idetape_issue_packet_command (ide_drive_t
*drive
, idetape_pc_t
*pc
)
1534 ide_hwif_t
*hwif
= drive
->hwif
;
1535 idetape_tape_t
*tape
= drive
->driver_data
;
1539 if (tape
->pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
&&
1540 pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
) {
1541 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
1542 "Two request sense in serial were issued\n");
1545 if (tape
->failed_pc
== NULL
&& pc
->c
[0] != IDETAPE_REQUEST_SENSE_CMD
)
1546 tape
->failed_pc
= pc
;
1547 /* Set the current packet command */
1550 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
1551 test_bit(PC_ABORT
, &pc
->flags
)) {
1553 * We will "abort" retrying a packet command in case
1554 * a legitimate error code was received (crossing a
1555 * filemark, or end of the media, for example).
1557 if (!test_bit(PC_ABORT
, &pc
->flags
)) {
1558 if (!(pc
->c
[0] == IDETAPE_TEST_UNIT_READY_CMD
&&
1559 tape
->sense_key
== 2 && tape
->asc
== 4 &&
1560 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
1561 printk(KERN_ERR
"ide-tape: %s: I/O error, "
1562 "pc = %2x, key = %2x, "
1563 "asc = %2x, ascq = %2x\n",
1564 tape
->name
, pc
->c
[0],
1565 tape
->sense_key
, tape
->asc
,
1569 pc
->error
= IDETAPE_ERROR_GENERAL
;
1571 tape
->failed_pc
= NULL
;
1572 return pc
->callback(drive
);
1574 #if IDETAPE_DEBUG_LOG
1575 if (tape
->debug_level
>= 2)
1576 printk(KERN_INFO
"ide-tape: Retry number - %d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
1577 #endif /* IDETAPE_DEBUG_LOG */
1580 /* We haven't transferred any data yet */
1581 pc
->actually_transferred
= 0;
1582 pc
->current_position
= pc
->buffer
;
1583 /* Request to transfer the entire buffer at once */
1584 bcount
= pc
->request_transfer
;
1586 if (test_and_clear_bit(PC_DMA_ERROR
, &pc
->flags
)) {
1587 printk(KERN_WARNING
"ide-tape: DMA disabled, "
1588 "reverting to PIO\n");
1591 if (test_bit(PC_DMA_RECOMMENDED
, &pc
->flags
) && drive
->using_dma
)
1592 dma_ok
= !hwif
->dma_setup(drive
);
1594 ide_pktcmd_tf_load(drive
, IDE_TFLAG_NO_SELECT_MASK
|
1595 IDE_TFLAG_OUT_DEVICE
, bcount
, dma_ok
);
1597 if (dma_ok
) /* Will begin DMA later */
1598 set_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
);
1599 if (test_bit(IDETAPE_DRQ_INTERRUPT
, &tape
->flags
)) {
1600 ide_execute_command(drive
, WIN_PACKETCMD
, &idetape_transfer_pc
,
1601 IDETAPE_WAIT_CMD
, NULL
);
1604 hwif
->OUTB(WIN_PACKETCMD
, IDE_COMMAND_REG
);
1605 return idetape_transfer_pc(drive
);
1610 * General packet command callback function.
1612 static ide_startstop_t
idetape_pc_callback (ide_drive_t
*drive
)
1614 idetape_tape_t
*tape
= drive
->driver_data
;
1616 #if IDETAPE_DEBUG_LOG
1617 if (tape
->debug_level
>= 4)
1618 printk(KERN_INFO
"ide-tape: Reached idetape_pc_callback\n");
1619 #endif /* IDETAPE_DEBUG_LOG */
1621 idetape_end_request(drive
, tape
->pc
->error
? 0 : 1, 0);
1626 * A mode sense command is used to "sense" tape parameters.
1628 static void idetape_create_mode_sense_cmd (idetape_pc_t
*pc
, u8 page_code
)
1630 idetape_init_pc(pc
);
1631 pc
->c
[0] = IDETAPE_MODE_SENSE_CMD
;
1632 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
1633 pc
->c
[1] = 8; /* DBD = 1 - Don't return block descriptors */
1634 pc
->c
[2] = page_code
;
1636 * Changed pc->c[3] to 0 (255 will at best return unused info).
1638 * For SCSI this byte is defined as subpage instead of high byte
1639 * of length and some IDE drives seem to interpret it this way
1640 * and return an error when 255 is used.
1643 pc
->c
[4] = 255; /* (We will just discard data in that case) */
1644 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
1645 pc
->request_transfer
= 12;
1646 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
1647 pc
->request_transfer
= 24;
1649 pc
->request_transfer
= 50;
1650 pc
->callback
= &idetape_pc_callback
;
1653 static void calculate_speeds(ide_drive_t
*drive
)
1655 idetape_tape_t
*tape
= drive
->driver_data
;
1656 int full
= 125, empty
= 75;
1658 if (time_after(jiffies
, tape
->controlled_pipeline_head_time
+ 120 * HZ
)) {
1659 tape
->controlled_previous_pipeline_head
= tape
->controlled_last_pipeline_head
;
1660 tape
->controlled_previous_head_time
= tape
->controlled_pipeline_head_time
;
1661 tape
->controlled_last_pipeline_head
= tape
->pipeline_head
;
1662 tape
->controlled_pipeline_head_time
= jiffies
;
1664 if (time_after(jiffies
, tape
->controlled_pipeline_head_time
+ 60 * HZ
))
1665 tape
->controlled_pipeline_head_speed
= (tape
->pipeline_head
- tape
->controlled_last_pipeline_head
) * 32 * HZ
/ (jiffies
- tape
->controlled_pipeline_head_time
);
1666 else if (time_after(jiffies
, tape
->controlled_previous_head_time
))
1667 tape
->controlled_pipeline_head_speed
= (tape
->pipeline_head
- tape
->controlled_previous_pipeline_head
) * 32 * HZ
/ (jiffies
- tape
->controlled_previous_head_time
);
1669 if (tape
->nr_pending_stages
< tape
->max_stages
/*- 1 */) {
1670 /* -1 for read mode error recovery */
1671 if (time_after(jiffies
, tape
->uncontrolled_previous_head_time
+ 10 * HZ
)) {
1672 tape
->uncontrolled_pipeline_head_time
= jiffies
;
1673 tape
->uncontrolled_pipeline_head_speed
= (tape
->pipeline_head
- tape
->uncontrolled_previous_pipeline_head
) * 32 * HZ
/ (jiffies
- tape
->uncontrolled_previous_head_time
);
1676 tape
->uncontrolled_previous_head_time
= jiffies
;
1677 tape
->uncontrolled_previous_pipeline_head
= tape
->pipeline_head
;
1678 if (time_after(jiffies
, tape
->uncontrolled_pipeline_head_time
+ 30 * HZ
)) {
1679 tape
->uncontrolled_pipeline_head_time
= jiffies
;
1682 tape
->pipeline_head_speed
= max(tape
->uncontrolled_pipeline_head_speed
, tape
->controlled_pipeline_head_speed
);
1683 if (tape
->speed_control
== 0) {
1684 tape
->max_insert_speed
= 5000;
1685 } else if (tape
->speed_control
== 1) {
1686 if (tape
->nr_pending_stages
>= tape
->max_stages
/ 2)
1687 tape
->max_insert_speed
= tape
->pipeline_head_speed
+
1688 (1100 - tape
->pipeline_head_speed
) * 2 * (tape
->nr_pending_stages
- tape
->max_stages
/ 2) / tape
->max_stages
;
1690 tape
->max_insert_speed
= 500 +
1691 (tape
->pipeline_head_speed
- 500) * 2 * tape
->nr_pending_stages
/ tape
->max_stages
;
1692 if (tape
->nr_pending_stages
>= tape
->max_stages
* 99 / 100)
1693 tape
->max_insert_speed
= 5000;
1694 } else if (tape
->speed_control
== 2) {
1695 tape
->max_insert_speed
= tape
->pipeline_head_speed
* empty
/ 100 +
1696 (tape
->pipeline_head_speed
* full
/ 100 - tape
->pipeline_head_speed
* empty
/ 100) * tape
->nr_pending_stages
/ tape
->max_stages
;
1698 tape
->max_insert_speed
= tape
->speed_control
;
1699 tape
->max_insert_speed
= max(tape
->max_insert_speed
, 500);
1702 static ide_startstop_t
idetape_media_access_finished (ide_drive_t
*drive
)
1704 idetape_tape_t
*tape
= drive
->driver_data
;
1705 idetape_pc_t
*pc
= tape
->pc
;
1708 stat
= drive
->hwif
->INB(IDE_STATUS_REG
);
1709 if (stat
& SEEK_STAT
) {
1710 if (stat
& ERR_STAT
) {
1711 /* Error detected */
1712 if (pc
->c
[0] != IDETAPE_TEST_UNIT_READY_CMD
)
1713 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
1715 /* Retry operation */
1716 return idetape_retry_pc(drive
);
1719 if (tape
->failed_pc
== pc
)
1720 tape
->failed_pc
= NULL
;
1722 pc
->error
= IDETAPE_ERROR_GENERAL
;
1723 tape
->failed_pc
= NULL
;
1725 return pc
->callback(drive
);
1728 static ide_startstop_t
idetape_rw_callback (ide_drive_t
*drive
)
1730 idetape_tape_t
*tape
= drive
->driver_data
;
1731 struct request
*rq
= HWGROUP(drive
)->rq
;
1732 int blocks
= tape
->pc
->actually_transferred
/ tape
->tape_block_size
;
1734 tape
->avg_size
+= blocks
* tape
->tape_block_size
;
1735 tape
->insert_size
+= blocks
* tape
->tape_block_size
;
1736 if (tape
->insert_size
> 1024 * 1024)
1737 tape
->measure_insert_time
= 1;
1738 if (tape
->measure_insert_time
) {
1739 tape
->measure_insert_time
= 0;
1740 tape
->insert_time
= jiffies
;
1741 tape
->insert_size
= 0;
1743 if (time_after(jiffies
, tape
->insert_time
))
1744 tape
->insert_speed
= tape
->insert_size
/ 1024 * HZ
/ (jiffies
- tape
->insert_time
);
1745 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
1746 tape
->avg_speed
= tape
->avg_size
* HZ
/ (jiffies
- tape
->avg_time
) / 1024;
1748 tape
->avg_time
= jiffies
;
1751 #if IDETAPE_DEBUG_LOG
1752 if (tape
->debug_level
>= 4)
1753 printk(KERN_INFO
"ide-tape: Reached idetape_rw_callback\n");
1754 #endif /* IDETAPE_DEBUG_LOG */
1756 tape
->first_frame_position
+= blocks
;
1757 rq
->current_nr_sectors
-= blocks
;
1759 if (!tape
->pc
->error
)
1760 idetape_end_request(drive
, 1, 0);
1762 idetape_end_request(drive
, tape
->pc
->error
, 0);
1766 static void idetape_create_read_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
, unsigned int length
, struct idetape_bh
*bh
)
1768 idetape_init_pc(pc
);
1769 pc
->c
[0] = IDETAPE_READ_CMD
;
1770 put_unaligned(htonl(length
), (unsigned int *) &pc
->c
[1]);
1772 pc
->callback
= &idetape_rw_callback
;
1774 atomic_set(&bh
->b_count
, 0);
1776 pc
->request_transfer
= pc
->buffer_size
= length
* tape
->tape_block_size
;
1777 if (pc
->request_transfer
== tape
->stage_size
)
1778 set_bit(PC_DMA_RECOMMENDED
, &pc
->flags
);
1781 static void idetape_create_read_buffer_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
, unsigned int length
, struct idetape_bh
*bh
)
1784 struct idetape_bh
*p
= bh
;
1786 idetape_init_pc(pc
);
1787 pc
->c
[0] = IDETAPE_READ_BUFFER_CMD
;
1788 pc
->c
[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK
;
1789 pc
->c
[7] = size
>> 8;
1790 pc
->c
[8] = size
& 0xff;
1791 pc
->callback
= &idetape_pc_callback
;
1793 atomic_set(&bh
->b_count
, 0);
1796 atomic_set(&p
->b_count
, 0);
1799 pc
->request_transfer
= pc
->buffer_size
= size
;
1802 static void idetape_create_write_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
, unsigned int length
, struct idetape_bh
*bh
)
1804 idetape_init_pc(pc
);
1805 pc
->c
[0] = IDETAPE_WRITE_CMD
;
1806 put_unaligned(htonl(length
), (unsigned int *) &pc
->c
[1]);
1808 pc
->callback
= &idetape_rw_callback
;
1809 set_bit(PC_WRITING
, &pc
->flags
);
1811 pc
->b_data
= bh
->b_data
;
1812 pc
->b_count
= atomic_read(&bh
->b_count
);
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
);
1820 * idetape_do_request is our request handling function.
1822 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
1823 struct request
*rq
, sector_t block
)
1825 idetape_tape_t
*tape
= drive
->driver_data
;
1826 idetape_pc_t
*pc
= NULL
;
1827 struct request
*postponed_rq
= tape
->postponed_rq
;
1830 #if IDETAPE_DEBUG_LOG
1831 if (tape
->debug_level
>= 2)
1832 printk(KERN_INFO
"ide-tape: sector: %ld, "
1833 "nr_sectors: %ld, current_nr_sectors: %d\n",
1834 rq
->sector
, rq
->nr_sectors
, rq
->current_nr_sectors
);
1835 #endif /* IDETAPE_DEBUG_LOG */
1837 if (!blk_special_request(rq
)) {
1839 * We do not support buffer cache originated requests.
1841 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
1842 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
1843 ide_end_request(drive
, 0, 0);
1848 * Retry a failed packet command
1850 if (tape
->failed_pc
!= NULL
&&
1851 tape
->pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
) {
1852 return idetape_issue_packet_command(drive
, tape
->failed_pc
);
1854 if (postponed_rq
!= NULL
)
1855 if (rq
!= postponed_rq
) {
1856 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
1857 "Two DSC requests were queued\n");
1858 idetape_end_request(drive
, 0, 0);
1862 tape
->postponed_rq
= NULL
;
1865 * If the tape is still busy, postpone our request and service
1866 * the other device meanwhile.
1868 stat
= drive
->hwif
->INB(IDE_STATUS_REG
);
1870 if (!drive
->dsc_overlap
&& !(rq
->cmd
[0] & REQ_IDETAPE_PC2
))
1871 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
1873 if (drive
->post_reset
== 1) {
1874 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
1875 drive
->post_reset
= 0;
1878 if (tape
->tape_still_time
> 100 && tape
->tape_still_time
< 200)
1879 tape
->measure_insert_time
= 1;
1880 if (time_after(jiffies
, tape
->insert_time
))
1881 tape
->insert_speed
= tape
->insert_size
/ 1024 * HZ
/ (jiffies
- tape
->insert_time
);
1882 calculate_speeds(drive
);
1883 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
) &&
1884 (stat
& SEEK_STAT
) == 0) {
1885 if (postponed_rq
== NULL
) {
1886 tape
->dsc_polling_start
= jiffies
;
1887 tape
->dsc_polling_frequency
= tape
->best_dsc_rw_frequency
;
1888 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
1889 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
1890 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
1892 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1893 idetape_media_access_finished(drive
);
1896 return ide_do_reset(drive
);
1898 } else if (time_after(jiffies
, tape
->dsc_polling_start
+ IDETAPE_DSC_MA_THRESHOLD
))
1899 tape
->dsc_polling_frequency
= IDETAPE_DSC_MA_SLOW
;
1900 idetape_postpone_request(drive
);
1903 if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1904 tape
->buffer_head
++;
1905 tape
->postpone_cnt
= 0;
1906 pc
= idetape_next_pc_storage(drive
);
1907 idetape_create_read_cmd(tape
, pc
, rq
->current_nr_sectors
, (struct idetape_bh
*)rq
->special
);
1910 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1911 tape
->buffer_head
++;
1912 tape
->postpone_cnt
= 0;
1913 pc
= idetape_next_pc_storage(drive
);
1914 idetape_create_write_cmd(tape
, pc
, rq
->current_nr_sectors
, (struct idetape_bh
*)rq
->special
);
1917 if (rq
->cmd
[0] & REQ_IDETAPE_READ_BUFFER
) {
1918 tape
->postpone_cnt
= 0;
1919 pc
= idetape_next_pc_storage(drive
);
1920 idetape_create_read_buffer_cmd(tape
, pc
, rq
->current_nr_sectors
, (struct idetape_bh
*)rq
->special
);
1923 if (rq
->cmd
[0] & REQ_IDETAPE_PC1
) {
1924 pc
= (idetape_pc_t
*) rq
->buffer
;
1925 rq
->cmd
[0] &= ~(REQ_IDETAPE_PC1
);
1926 rq
->cmd
[0] |= REQ_IDETAPE_PC2
;
1929 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1930 idetape_media_access_finished(drive
);
1935 return idetape_issue_packet_command(drive
, pc
);
1939 * Pipeline related functions
1941 static inline int idetape_pipeline_active (idetape_tape_t
*tape
)
1945 rc1
= test_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
1946 rc2
= (tape
->active_data_request
!= NULL
);
1951 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
1952 * stage, along with all the necessary small buffers which together make
1953 * a buffer of size tape->stage_size (or a bit more). We attempt to
1954 * combine sequential pages as much as possible.
1956 * Returns a pointer to the new allocated stage, or NULL if we
1957 * can't (or don't want to) allocate a stage.
1959 * Pipeline stages are optional and are used to increase performance.
1960 * If we can't allocate them, we'll manage without them.
1962 static idetape_stage_t
*__idetape_kmalloc_stage (idetape_tape_t
*tape
, int full
, int clear
)
1964 idetape_stage_t
*stage
;
1965 struct idetape_bh
*prev_bh
, *bh
;
1966 int pages
= tape
->pages_per_stage
;
1967 char *b_data
= NULL
;
1969 if ((stage
= kmalloc(sizeof (idetape_stage_t
),GFP_KERNEL
)) == NULL
)
1973 bh
= stage
->bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1976 bh
->b_reqnext
= NULL
;
1977 if ((bh
->b_data
= (char *) __get_free_page (GFP_KERNEL
)) == NULL
)
1980 memset(bh
->b_data
, 0, PAGE_SIZE
);
1981 bh
->b_size
= PAGE_SIZE
;
1982 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1985 if ((b_data
= (char *) __get_free_page (GFP_KERNEL
)) == NULL
)
1988 memset(b_data
, 0, PAGE_SIZE
);
1989 if (bh
->b_data
== b_data
+ PAGE_SIZE
) {
1990 bh
->b_size
+= PAGE_SIZE
;
1991 bh
->b_data
-= PAGE_SIZE
;
1993 atomic_add(PAGE_SIZE
, &bh
->b_count
);
1996 if (b_data
== bh
->b_data
+ bh
->b_size
) {
1997 bh
->b_size
+= PAGE_SIZE
;
1999 atomic_add(PAGE_SIZE
, &bh
->b_count
);
2003 if ((bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
)) == NULL
) {
2004 free_page((unsigned long) b_data
);
2007 bh
->b_reqnext
= NULL
;
2008 bh
->b_data
= b_data
;
2009 bh
->b_size
= PAGE_SIZE
;
2010 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
2011 prev_bh
->b_reqnext
= bh
;
2013 bh
->b_size
-= tape
->excess_bh_size
;
2015 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
2018 __idetape_kfree_stage(stage
);
2022 static idetape_stage_t
*idetape_kmalloc_stage (idetape_tape_t
*tape
)
2024 idetape_stage_t
*cache_stage
= tape
->cache_stage
;
2026 #if IDETAPE_DEBUG_LOG
2027 if (tape
->debug_level
>= 4)
2028 printk(KERN_INFO
"ide-tape: Reached idetape_kmalloc_stage\n");
2029 #endif /* IDETAPE_DEBUG_LOG */
2031 if (tape
->nr_stages
>= tape
->max_stages
)
2033 if (cache_stage
!= NULL
) {
2034 tape
->cache_stage
= NULL
;
2037 return __idetape_kmalloc_stage(tape
, 0, 0);
2040 static int idetape_copy_stage_from_user (idetape_tape_t
*tape
, idetape_stage_t
*stage
, const char __user
*buf
, int n
)
2042 struct idetape_bh
*bh
= tape
->bh
;
2048 printk(KERN_ERR
"ide-tape: bh == NULL in "
2049 "idetape_copy_stage_from_user\n");
2052 count
= min((unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)), (unsigned int)n
);
2053 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
, count
))
2056 atomic_add(count
, &bh
->b_count
);
2058 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
2061 atomic_set(&bh
->b_count
, 0);
2068 static int idetape_copy_stage_to_user (idetape_tape_t
*tape
, char __user
*buf
, idetape_stage_t
*stage
, int n
)
2070 struct idetape_bh
*bh
= tape
->bh
;
2076 printk(KERN_ERR
"ide-tape: bh == NULL in "
2077 "idetape_copy_stage_to_user\n");
2080 count
= min(tape
->b_count
, n
);
2081 if (copy_to_user(buf
, tape
->b_data
, count
))
2084 tape
->b_data
+= count
;
2085 tape
->b_count
-= count
;
2087 if (!tape
->b_count
) {
2088 tape
->bh
= bh
= bh
->b_reqnext
;
2090 tape
->b_data
= bh
->b_data
;
2091 tape
->b_count
= atomic_read(&bh
->b_count
);
2098 static void idetape_init_merge_stage (idetape_tape_t
*tape
)
2100 struct idetape_bh
*bh
= tape
->merge_stage
->bh
;
2103 if (tape
->chrdev_direction
== idetape_direction_write
)
2104 atomic_set(&bh
->b_count
, 0);
2106 tape
->b_data
= bh
->b_data
;
2107 tape
->b_count
= atomic_read(&bh
->b_count
);
2111 static void idetape_switch_buffers (idetape_tape_t
*tape
, idetape_stage_t
*stage
)
2113 struct idetape_bh
*tmp
;
2116 stage
->bh
= tape
->merge_stage
->bh
;
2117 tape
->merge_stage
->bh
= tmp
;
2118 idetape_init_merge_stage(tape
);
2122 * idetape_add_stage_tail adds a new stage at the end of the pipeline.
2124 static void idetape_add_stage_tail (ide_drive_t
*drive
,idetape_stage_t
*stage
)
2126 idetape_tape_t
*tape
= drive
->driver_data
;
2127 unsigned long flags
;
2129 #if IDETAPE_DEBUG_LOG
2130 if (tape
->debug_level
>= 4)
2131 printk (KERN_INFO
"ide-tape: Reached idetape_add_stage_tail\n");
2132 #endif /* IDETAPE_DEBUG_LOG */
2133 spin_lock_irqsave(&tape
->spinlock
, flags
);
2135 if (tape
->last_stage
!= NULL
)
2136 tape
->last_stage
->next
=stage
;
2138 tape
->first_stage
= tape
->next_stage
=stage
;
2139 tape
->last_stage
= stage
;
2140 if (tape
->next_stage
== NULL
)
2141 tape
->next_stage
= tape
->last_stage
;
2143 tape
->nr_pending_stages
++;
2144 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2148 * idetape_wait_for_request installs a completion in a pending request
2149 * and sleeps until it is serviced.
2151 * The caller should ensure that the request will not be serviced
2152 * before we install the completion (usually by disabling interrupts).
2154 static void idetape_wait_for_request (ide_drive_t
*drive
, struct request
*rq
)
2156 DECLARE_COMPLETION_ONSTACK(wait
);
2157 idetape_tape_t
*tape
= drive
->driver_data
;
2159 if (rq
== NULL
|| !blk_special_request(rq
)) {
2160 printk (KERN_ERR
"ide-tape: bug: Trying to sleep on non-valid request\n");
2163 rq
->end_io_data
= &wait
;
2164 rq
->end_io
= blk_end_sync_rq
;
2165 spin_unlock_irq(&tape
->spinlock
);
2166 wait_for_completion(&wait
);
2167 /* The stage and its struct request have been deallocated */
2168 spin_lock_irq(&tape
->spinlock
);
2171 static ide_startstop_t
idetape_read_position_callback (ide_drive_t
*drive
)
2173 idetape_tape_t
*tape
= drive
->driver_data
;
2174 idetape_read_position_result_t
*result
;
2176 #if IDETAPE_DEBUG_LOG
2177 if (tape
->debug_level
>= 4)
2178 printk(KERN_INFO
"ide-tape: Reached idetape_read_position_callback\n");
2179 #endif /* IDETAPE_DEBUG_LOG */
2181 if (!tape
->pc
->error
) {
2182 result
= (idetape_read_position_result_t
*) tape
->pc
->buffer
;
2183 #if IDETAPE_DEBUG_LOG
2184 if (tape
->debug_level
>= 2)
2185 printk(KERN_INFO
"ide-tape: BOP - %s\n",result
->bop
? "Yes":"No");
2186 if (tape
->debug_level
>= 2)
2187 printk(KERN_INFO
"ide-tape: EOP - %s\n",result
->eop
? "Yes":"No");
2188 #endif /* IDETAPE_DEBUG_LOG */
2190 printk(KERN_INFO
"ide-tape: Block location is unknown to the tape\n");
2191 clear_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
);
2192 idetape_end_request(drive
, 0, 0);
2194 #if IDETAPE_DEBUG_LOG
2195 if (tape
->debug_level
>= 2)
2196 printk(KERN_INFO
"ide-tape: Block Location - %u\n", ntohl(result
->first_block
));
2197 #endif /* IDETAPE_DEBUG_LOG */
2198 tape
->partition
= result
->partition
;
2199 tape
->first_frame_position
= ntohl(result
->first_block
);
2200 tape
->last_frame_position
= ntohl(result
->last_block
);
2201 tape
->blocks_in_buffer
= result
->blocks_in_buffer
[2];
2202 set_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
);
2203 idetape_end_request(drive
, 1, 0);
2206 idetape_end_request(drive
, 0, 0);
2212 * idetape_create_write_filemark_cmd will:
2214 * 1. Write a filemark if write_filemark=1.
2215 * 2. Flush the device buffers without writing a filemark
2216 * if write_filemark=0.
2219 static void idetape_create_write_filemark_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
,int write_filemark
)
2221 idetape_init_pc(pc
);
2222 pc
->c
[0] = IDETAPE_WRITE_FILEMARK_CMD
;
2223 pc
->c
[4] = write_filemark
;
2224 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2225 pc
->callback
= &idetape_pc_callback
;
2228 static void idetape_create_test_unit_ready_cmd(idetape_pc_t
*pc
)
2230 idetape_init_pc(pc
);
2231 pc
->c
[0] = IDETAPE_TEST_UNIT_READY_CMD
;
2232 pc
->callback
= &idetape_pc_callback
;
2236 * idetape_queue_pc_tail is based on the following functions:
2238 * ide_do_drive_cmd from ide.c
2239 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
2241 * We add a special packet command request to the tail of the request
2242 * queue, and wait for it to be serviced.
2244 * This is not to be called from within the request handling part
2245 * of the driver ! We allocate here data in the stack, and it is valid
2246 * until the request is finished. This is not the case for the bottom
2247 * part of the driver, where we are always leaving the functions to wait
2248 * for an interrupt or a timer event.
2250 * From the bottom part of the driver, we should allocate safe memory
2251 * using idetape_next_pc_storage and idetape_next_rq_storage, and add
2252 * the request to the request list without waiting for it to be serviced !
2253 * In that case, we usually use idetape_queue_pc_head.
2255 static int __idetape_queue_pc_tail (ide_drive_t
*drive
, idetape_pc_t
*pc
)
2257 struct ide_tape_obj
*tape
= drive
->driver_data
;
2260 idetape_init_rq(&rq
, REQ_IDETAPE_PC1
);
2261 rq
.buffer
= (char *) pc
;
2262 rq
.rq_disk
= tape
->disk
;
2263 return ide_do_drive_cmd(drive
, &rq
, ide_wait
);
2266 static void idetape_create_load_unload_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
,int cmd
)
2268 idetape_init_pc(pc
);
2269 pc
->c
[0] = IDETAPE_LOAD_UNLOAD_CMD
;
2271 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2272 pc
->callback
= &idetape_pc_callback
;
2275 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
2277 idetape_tape_t
*tape
= drive
->driver_data
;
2279 int load_attempted
= 0;
2282 * Wait for the tape to become ready
2284 set_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
);
2286 while (time_before(jiffies
, timeout
)) {
2287 idetape_create_test_unit_ready_cmd(&pc
);
2288 if (!__idetape_queue_pc_tail(drive
, &pc
))
2290 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
2291 || (tape
->asc
== 0x3A)) { /* no media */
2294 idetape_create_load_unload_cmd(drive
, &pc
, IDETAPE_LU_LOAD_MASK
);
2295 __idetape_queue_pc_tail(drive
, &pc
);
2297 /* not about to be ready */
2298 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
2299 (tape
->ascq
== 1 || tape
->ascq
== 8)))
2306 static int idetape_queue_pc_tail (ide_drive_t
*drive
,idetape_pc_t
*pc
)
2308 return __idetape_queue_pc_tail(drive
, pc
);
2311 static int idetape_flush_tape_buffers (ide_drive_t
*drive
)
2316 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
2317 if ((rc
= idetape_queue_pc_tail(drive
, &pc
)))
2319 idetape_wait_ready(drive
, 60 * 5 * HZ
);
2323 static void idetape_create_read_position_cmd (idetape_pc_t
*pc
)
2325 idetape_init_pc(pc
);
2326 pc
->c
[0] = IDETAPE_READ_POSITION_CMD
;
2327 pc
->request_transfer
= 20;
2328 pc
->callback
= &idetape_read_position_callback
;
2331 static int idetape_read_position (ide_drive_t
*drive
)
2333 idetape_tape_t
*tape
= drive
->driver_data
;
2337 #if IDETAPE_DEBUG_LOG
2338 if (tape
->debug_level
>= 4)
2339 printk(KERN_INFO
"ide-tape: Reached idetape_read_position\n");
2340 #endif /* IDETAPE_DEBUG_LOG */
2342 idetape_create_read_position_cmd(&pc
);
2343 if (idetape_queue_pc_tail(drive
, &pc
))
2345 position
= tape
->first_frame_position
;
2349 static void idetape_create_locate_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
, unsigned int block
, u8 partition
, int skip
)
2351 idetape_init_pc(pc
);
2352 pc
->c
[0] = IDETAPE_LOCATE_CMD
;
2354 put_unaligned(htonl(block
), (unsigned int *) &pc
->c
[3]);
2355 pc
->c
[8] = partition
;
2356 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2357 pc
->callback
= &idetape_pc_callback
;
2360 static int idetape_create_prevent_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
, int prevent
)
2362 idetape_tape_t
*tape
= drive
->driver_data
;
2364 /* device supports locking according to capabilities page */
2365 if (!(tape
->caps
[6] & 0x01))
2368 idetape_init_pc(pc
);
2369 pc
->c
[0] = IDETAPE_PREVENT_CMD
;
2371 pc
->callback
= &idetape_pc_callback
;
2375 static int __idetape_discard_read_pipeline (ide_drive_t
*drive
)
2377 idetape_tape_t
*tape
= drive
->driver_data
;
2378 unsigned long flags
;
2381 if (tape
->chrdev_direction
!= idetape_direction_read
)
2384 /* Remove merge stage. */
2385 cnt
= tape
->merge_stage_size
/ tape
->tape_block_size
;
2386 if (test_and_clear_bit(IDETAPE_FILEMARK
, &tape
->flags
))
2387 ++cnt
; /* Filemarks count as 1 sector */
2388 tape
->merge_stage_size
= 0;
2389 if (tape
->merge_stage
!= NULL
) {
2390 __idetape_kfree_stage(tape
->merge_stage
);
2391 tape
->merge_stage
= NULL
;
2394 /* Clear pipeline flags. */
2395 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
2396 tape
->chrdev_direction
= idetape_direction_none
;
2398 /* Remove pipeline stages. */
2399 if (tape
->first_stage
== NULL
)
2402 spin_lock_irqsave(&tape
->spinlock
, flags
);
2403 tape
->next_stage
= NULL
;
2404 if (idetape_pipeline_active(tape
))
2405 idetape_wait_for_request(drive
, tape
->active_data_request
);
2406 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2408 while (tape
->first_stage
!= NULL
) {
2409 struct request
*rq_ptr
= &tape
->first_stage
->rq
;
2411 cnt
+= rq_ptr
->nr_sectors
- rq_ptr
->current_nr_sectors
;
2412 if (rq_ptr
->errors
== IDETAPE_ERROR_FILEMARK
)
2414 idetape_remove_stage_head(drive
);
2416 tape
->nr_pending_stages
= 0;
2417 tape
->max_stages
= tape
->min_pipeline
;
2422 * idetape_position_tape positions the tape to the requested block
2423 * using the LOCATE packet command. A READ POSITION command is then
2424 * issued to check where we are positioned.
2426 * Like all higher level operations, we queue the commands at the tail
2427 * of the request queue and wait for their completion.
2430 static int idetape_position_tape (ide_drive_t
*drive
, unsigned int block
, u8 partition
, int skip
)
2432 idetape_tape_t
*tape
= drive
->driver_data
;
2436 if (tape
->chrdev_direction
== idetape_direction_read
)
2437 __idetape_discard_read_pipeline(drive
);
2438 idetape_wait_ready(drive
, 60 * 5 * HZ
);
2439 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
2440 retval
= idetape_queue_pc_tail(drive
, &pc
);
2444 idetape_create_read_position_cmd(&pc
);
2445 return (idetape_queue_pc_tail(drive
, &pc
));
2448 static void idetape_discard_read_pipeline (ide_drive_t
*drive
, int restore_position
)
2450 idetape_tape_t
*tape
= drive
->driver_data
;
2454 cnt
= __idetape_discard_read_pipeline(drive
);
2455 if (restore_position
) {
2456 position
= idetape_read_position(drive
);
2457 seek
= position
> cnt
? position
- cnt
: 0;
2458 if (idetape_position_tape(drive
, seek
, 0, 0)) {
2459 printk(KERN_INFO
"ide-tape: %s: position_tape failed in discard_pipeline()\n", tape
->name
);
2466 * idetape_queue_rw_tail generates a read/write request for the block
2467 * device interface and wait for it to be serviced.
2469 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
, struct idetape_bh
*bh
)
2471 idetape_tape_t
*tape
= drive
->driver_data
;
2474 #if IDETAPE_DEBUG_LOG
2475 if (tape
->debug_level
>= 2)
2476 printk(KERN_INFO
"ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd
);
2477 #endif /* IDETAPE_DEBUG_LOG */
2478 if (idetape_pipeline_active(tape
)) {
2479 printk(KERN_ERR
"ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
2483 idetape_init_rq(&rq
, cmd
);
2484 rq
.rq_disk
= tape
->disk
;
2485 rq
.special
= (void *)bh
;
2486 rq
.sector
= tape
->first_frame_position
;
2487 rq
.nr_sectors
= rq
.current_nr_sectors
= blocks
;
2488 (void) ide_do_drive_cmd(drive
, &rq
, ide_wait
);
2490 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
2493 if (tape
->merge_stage
)
2494 idetape_init_merge_stage(tape
);
2495 if (rq
.errors
== IDETAPE_ERROR_GENERAL
)
2497 return (tape
->tape_block_size
* (blocks
-rq
.current_nr_sectors
));
2501 * idetape_insert_pipeline_into_queue is used to start servicing the
2502 * pipeline stages, starting from tape->next_stage.
2504 static void idetape_insert_pipeline_into_queue (ide_drive_t
*drive
)
2506 idetape_tape_t
*tape
= drive
->driver_data
;
2508 if (tape
->next_stage
== NULL
)
2510 if (!idetape_pipeline_active(tape
)) {
2511 set_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
2512 idetape_active_next_stage(drive
);
2513 (void) ide_do_drive_cmd(drive
, tape
->active_data_request
, ide_end
);
2517 static void idetape_create_inquiry_cmd (idetape_pc_t
*pc
)
2519 idetape_init_pc(pc
);
2520 pc
->c
[0] = IDETAPE_INQUIRY_CMD
;
2521 pc
->c
[4] = pc
->request_transfer
= 254;
2522 pc
->callback
= &idetape_pc_callback
;
2525 static void idetape_create_rewind_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
)
2527 idetape_init_pc(pc
);
2528 pc
->c
[0] = IDETAPE_REWIND_CMD
;
2529 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2530 pc
->callback
= &idetape_pc_callback
;
2533 static void idetape_create_erase_cmd (idetape_pc_t
*pc
)
2535 idetape_init_pc(pc
);
2536 pc
->c
[0] = IDETAPE_ERASE_CMD
;
2538 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2539 pc
->callback
= &idetape_pc_callback
;
2542 static void idetape_create_space_cmd (idetape_pc_t
*pc
,int count
, u8 cmd
)
2544 idetape_init_pc(pc
);
2545 pc
->c
[0] = IDETAPE_SPACE_CMD
;
2546 put_unaligned(htonl(count
), (unsigned int *) &pc
->c
[1]);
2548 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2549 pc
->callback
= &idetape_pc_callback
;
2552 static void idetape_wait_first_stage (ide_drive_t
*drive
)
2554 idetape_tape_t
*tape
= drive
->driver_data
;
2555 unsigned long flags
;
2557 if (tape
->first_stage
== NULL
)
2559 spin_lock_irqsave(&tape
->spinlock
, flags
);
2560 if (tape
->active_stage
== tape
->first_stage
)
2561 idetape_wait_for_request(drive
, tape
->active_data_request
);
2562 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2566 * idetape_add_chrdev_write_request tries to add a character device
2567 * originated write request to our pipeline. In case we don't succeed,
2568 * we revert to non-pipelined operation mode for this request.
2570 * 1. Try to allocate a new pipeline stage.
2571 * 2. If we can't, wait for more and more requests to be serviced
2572 * and try again each time.
2573 * 3. If we still can't allocate a stage, fallback to
2574 * non-pipelined operation mode for this request.
2576 static int idetape_add_chrdev_write_request (ide_drive_t
*drive
, int blocks
)
2578 idetape_tape_t
*tape
= drive
->driver_data
;
2579 idetape_stage_t
*new_stage
;
2580 unsigned long flags
;
2583 #if IDETAPE_DEBUG_LOG
2584 if (tape
->debug_level
>= 3)
2585 printk(KERN_INFO
"ide-tape: Reached idetape_add_chrdev_write_request\n");
2586 #endif /* IDETAPE_DEBUG_LOG */
2589 * Attempt to allocate a new stage.
2590 * Pay special attention to possible race conditions.
2592 while ((new_stage
= idetape_kmalloc_stage(tape
)) == NULL
) {
2593 spin_lock_irqsave(&tape
->spinlock
, flags
);
2594 if (idetape_pipeline_active(tape
)) {
2595 idetape_wait_for_request(drive
, tape
->active_data_request
);
2596 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2598 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2599 idetape_insert_pipeline_into_queue(drive
);
2600 if (idetape_pipeline_active(tape
))
2603 * Linux is short on memory. Fallback to
2604 * non-pipelined operation mode for this request.
2606 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
, tape
->merge_stage
->bh
);
2609 rq
= &new_stage
->rq
;
2610 idetape_init_rq(rq
, REQ_IDETAPE_WRITE
);
2611 /* Doesn't actually matter - We always assume sequential access */
2612 rq
->sector
= tape
->first_frame_position
;
2613 rq
->nr_sectors
= rq
->current_nr_sectors
= blocks
;
2615 idetape_switch_buffers(tape
, new_stage
);
2616 idetape_add_stage_tail(drive
, new_stage
);
2617 tape
->pipeline_head
++;
2618 calculate_speeds(drive
);
2621 * Estimate whether the tape has stopped writing by checking
2622 * if our write pipeline is currently empty. If we are not
2623 * writing anymore, wait for the pipeline to be full enough
2624 * (90%) before starting to service requests, so that we will
2625 * be able to keep up with the higher speeds of the tape.
2627 if (!idetape_pipeline_active(tape
)) {
2628 if (tape
->nr_stages
>= tape
->max_stages
* 9 / 10 ||
2629 tape
->nr_stages
>= tape
->max_stages
- tape
->uncontrolled_pipeline_head_speed
* 3 * 1024 / tape
->tape_block_size
) {
2630 tape
->measure_insert_time
= 1;
2631 tape
->insert_time
= jiffies
;
2632 tape
->insert_size
= 0;
2633 tape
->insert_speed
= 0;
2634 idetape_insert_pipeline_into_queue(drive
);
2637 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
))
2638 /* Return a deferred error */
2644 * idetape_wait_for_pipeline will wait until all pending pipeline
2645 * requests are serviced. Typically called on device close.
2647 static void idetape_wait_for_pipeline (ide_drive_t
*drive
)
2649 idetape_tape_t
*tape
= drive
->driver_data
;
2650 unsigned long flags
;
2652 while (tape
->next_stage
|| idetape_pipeline_active(tape
)) {
2653 idetape_insert_pipeline_into_queue(drive
);
2654 spin_lock_irqsave(&tape
->spinlock
, flags
);
2655 if (idetape_pipeline_active(tape
))
2656 idetape_wait_for_request(drive
, tape
->active_data_request
);
2657 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2661 static void idetape_empty_write_pipeline (ide_drive_t
*drive
)
2663 idetape_tape_t
*tape
= drive
->driver_data
;
2665 struct idetape_bh
*bh
;
2667 if (tape
->chrdev_direction
!= idetape_direction_write
) {
2668 printk(KERN_ERR
"ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
2671 if (tape
->merge_stage_size
> tape
->stage_size
) {
2672 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
2673 tape
->merge_stage_size
= tape
->stage_size
;
2675 if (tape
->merge_stage_size
) {
2676 blocks
= tape
->merge_stage_size
/ tape
->tape_block_size
;
2677 if (tape
->merge_stage_size
% tape
->tape_block_size
) {
2681 i
= tape
->tape_block_size
- tape
->merge_stage_size
% tape
->tape_block_size
;
2682 bh
= tape
->bh
->b_reqnext
;
2684 atomic_set(&bh
->b_count
, 0);
2691 printk(KERN_INFO
"ide-tape: bug, bh NULL\n");
2694 min
= min(i
, (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)));
2695 memset(bh
->b_data
+ atomic_read(&bh
->b_count
), 0, min
);
2696 atomic_add(min
, &bh
->b_count
);
2701 (void) idetape_add_chrdev_write_request(drive
, blocks
);
2702 tape
->merge_stage_size
= 0;
2704 idetape_wait_for_pipeline(drive
);
2705 if (tape
->merge_stage
!= NULL
) {
2706 __idetape_kfree_stage(tape
->merge_stage
);
2707 tape
->merge_stage
= NULL
;
2709 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
2710 tape
->chrdev_direction
= idetape_direction_none
;
2713 * On the next backup, perform the feedback loop again.
2714 * (I don't want to keep sense information between backups,
2715 * as some systems are constantly on, and the system load
2716 * can be totally different on the next backup).
2718 tape
->max_stages
= tape
->min_pipeline
;
2719 if (tape
->first_stage
!= NULL
||
2720 tape
->next_stage
!= NULL
||
2721 tape
->last_stage
!= NULL
||
2722 tape
->nr_stages
!= 0) {
2723 printk(KERN_ERR
"ide-tape: ide-tape pipeline bug, "
2724 "first_stage %p, next_stage %p, "
2725 "last_stage %p, nr_stages %d\n",
2726 tape
->first_stage
, tape
->next_stage
,
2727 tape
->last_stage
, tape
->nr_stages
);
2731 static void idetape_restart_speed_control (ide_drive_t
*drive
)
2733 idetape_tape_t
*tape
= drive
->driver_data
;
2735 tape
->restart_speed_control_req
= 0;
2736 tape
->pipeline_head
= 0;
2737 tape
->controlled_last_pipeline_head
= tape
->uncontrolled_last_pipeline_head
= 0;
2738 tape
->controlled_previous_pipeline_head
= tape
->uncontrolled_previous_pipeline_head
= 0;
2739 tape
->pipeline_head_speed
= tape
->controlled_pipeline_head_speed
= 5000;
2740 tape
->uncontrolled_pipeline_head_speed
= 0;
2741 tape
->controlled_pipeline_head_time
= tape
->uncontrolled_pipeline_head_time
= jiffies
;
2742 tape
->controlled_previous_head_time
= tape
->uncontrolled_previous_head_time
= jiffies
;
2745 static int idetape_initiate_read (ide_drive_t
*drive
, int max_stages
)
2747 idetape_tape_t
*tape
= drive
->driver_data
;
2748 idetape_stage_t
*new_stage
;
2751 u16 blocks
= *(u16
*)&tape
->caps
[12];
2753 /* Initialize read operation */
2754 if (tape
->chrdev_direction
!= idetape_direction_read
) {
2755 if (tape
->chrdev_direction
== idetape_direction_write
) {
2756 idetape_empty_write_pipeline(drive
);
2757 idetape_flush_tape_buffers(drive
);
2759 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
2760 printk (KERN_ERR
"ide-tape: merge_stage_size should be 0 now\n");
2761 tape
->merge_stage_size
= 0;
2763 if ((tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 0, 0)) == NULL
)
2765 tape
->chrdev_direction
= idetape_direction_read
;
2768 * Issue a read 0 command to ensure that DSC handshake
2769 * is switched from completion mode to buffer available
2771 * No point in issuing this if DSC overlap isn't supported,
2772 * some drives (Seagate STT3401A) will return an error.
2774 if (drive
->dsc_overlap
) {
2775 bytes_read
= idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, 0, tape
->merge_stage
->bh
);
2776 if (bytes_read
< 0) {
2777 __idetape_kfree_stage(tape
->merge_stage
);
2778 tape
->merge_stage
= NULL
;
2779 tape
->chrdev_direction
= idetape_direction_none
;
2784 if (tape
->restart_speed_control_req
)
2785 idetape_restart_speed_control(drive
);
2786 idetape_init_rq(&rq
, REQ_IDETAPE_READ
);
2787 rq
.sector
= tape
->first_frame_position
;
2788 rq
.nr_sectors
= rq
.current_nr_sectors
= blocks
;
2789 if (!test_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
) &&
2790 tape
->nr_stages
< max_stages
) {
2791 new_stage
= idetape_kmalloc_stage(tape
);
2792 while (new_stage
!= NULL
) {
2794 idetape_add_stage_tail(drive
, new_stage
);
2795 if (tape
->nr_stages
>= max_stages
)
2797 new_stage
= idetape_kmalloc_stage(tape
);
2800 if (!idetape_pipeline_active(tape
)) {
2801 if (tape
->nr_pending_stages
>= 3 * max_stages
/ 4) {
2802 tape
->measure_insert_time
= 1;
2803 tape
->insert_time
= jiffies
;
2804 tape
->insert_size
= 0;
2805 tape
->insert_speed
= 0;
2806 idetape_insert_pipeline_into_queue(drive
);
2813 * idetape_add_chrdev_read_request is called from idetape_chrdev_read
2814 * to service a character device read request and add read-ahead
2815 * requests to our pipeline.
2817 static int idetape_add_chrdev_read_request (ide_drive_t
*drive
,int blocks
)
2819 idetape_tape_t
*tape
= drive
->driver_data
;
2820 unsigned long flags
;
2821 struct request
*rq_ptr
;
2824 #if IDETAPE_DEBUG_LOG
2825 if (tape
->debug_level
>= 4)
2826 printk(KERN_INFO
"ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks
);
2827 #endif /* IDETAPE_DEBUG_LOG */
2830 * If we are at a filemark, return a read length of 0
2832 if (test_bit(IDETAPE_FILEMARK
, &tape
->flags
))
2836 * Wait for the next block to be available at the head
2839 idetape_initiate_read(drive
, tape
->max_stages
);
2840 if (tape
->first_stage
== NULL
) {
2841 if (test_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
))
2843 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
, tape
->merge_stage
->bh
);
2845 idetape_wait_first_stage(drive
);
2846 rq_ptr
= &tape
->first_stage
->rq
;
2847 bytes_read
= tape
->tape_block_size
* (rq_ptr
->nr_sectors
- rq_ptr
->current_nr_sectors
);
2848 rq_ptr
->nr_sectors
= rq_ptr
->current_nr_sectors
= 0;
2851 if (rq_ptr
->errors
== IDETAPE_ERROR_EOD
)
2854 idetape_switch_buffers(tape
, tape
->first_stage
);
2855 if (rq_ptr
->errors
== IDETAPE_ERROR_FILEMARK
)
2856 set_bit(IDETAPE_FILEMARK
, &tape
->flags
);
2857 spin_lock_irqsave(&tape
->spinlock
, flags
);
2858 idetape_remove_stage_head(drive
);
2859 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2860 tape
->pipeline_head
++;
2861 calculate_speeds(drive
);
2863 if (bytes_read
> blocks
* tape
->tape_block_size
) {
2864 printk(KERN_ERR
"ide-tape: bug: trying to return more bytes than requested\n");
2865 bytes_read
= blocks
* tape
->tape_block_size
;
2867 return (bytes_read
);
2870 static void idetape_pad_zeros (ide_drive_t
*drive
, int bcount
)
2872 idetape_tape_t
*tape
= drive
->driver_data
;
2873 struct idetape_bh
*bh
;
2879 bh
= tape
->merge_stage
->bh
;
2880 count
= min(tape
->stage_size
, bcount
);
2882 blocks
= count
/ tape
->tape_block_size
;
2884 atomic_set(&bh
->b_count
, min(count
, (unsigned int)bh
->b_size
));
2885 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
2886 count
-= atomic_read(&bh
->b_count
);
2889 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
, tape
->merge_stage
->bh
);
2893 static int idetape_pipeline_size (ide_drive_t
*drive
)
2895 idetape_tape_t
*tape
= drive
->driver_data
;
2896 idetape_stage_t
*stage
;
2900 idetape_wait_for_pipeline(drive
);
2901 stage
= tape
->first_stage
;
2902 while (stage
!= NULL
) {
2904 size
+= tape
->tape_block_size
* (rq
->nr_sectors
-rq
->current_nr_sectors
);
2905 if (rq
->errors
== IDETAPE_ERROR_FILEMARK
)
2906 size
+= tape
->tape_block_size
;
2907 stage
= stage
->next
;
2909 size
+= tape
->merge_stage_size
;
2914 * Rewinds the tape to the Beginning Of the current Partition (BOP).
2916 * We currently support only one partition.
2918 static int idetape_rewind_tape (ide_drive_t
*drive
)
2922 #if IDETAPE_DEBUG_LOG
2923 idetape_tape_t
*tape
= drive
->driver_data
;
2924 if (tape
->debug_level
>= 2)
2925 printk(KERN_INFO
"ide-tape: Reached idetape_rewind_tape\n");
2926 #endif /* IDETAPE_DEBUG_LOG */
2928 idetape_create_rewind_cmd(drive
, &pc
);
2929 retval
= idetape_queue_pc_tail(drive
, &pc
);
2933 idetape_create_read_position_cmd(&pc
);
2934 retval
= idetape_queue_pc_tail(drive
, &pc
);
2941 * Our special ide-tape ioctl's.
2943 * Currently there aren't any ioctl's.
2944 * mtio.h compatible commands should be issued to the character device
2947 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
, unsigned long arg
)
2949 idetape_tape_t
*tape
= drive
->driver_data
;
2950 idetape_config_t config
;
2951 void __user
*argp
= (void __user
*)arg
;
2953 #if IDETAPE_DEBUG_LOG
2954 if (tape
->debug_level
>= 4)
2955 printk(KERN_INFO
"ide-tape: Reached idetape_blkdev_ioctl\n");
2956 #endif /* IDETAPE_DEBUG_LOG */
2959 if (copy_from_user(&config
, argp
, sizeof (idetape_config_t
)))
2961 tape
->best_dsc_rw_frequency
= config
.dsc_rw_frequency
;
2962 tape
->max_stages
= config
.nr_stages
;
2965 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_frequency
;
2966 config
.nr_stages
= tape
->max_stages
;
2967 if (copy_to_user(argp
, &config
, sizeof (idetape_config_t
)))
2977 * idetape_space_over_filemarks is now a bit more complicated than just
2978 * passing the command to the tape since we may have crossed some
2979 * filemarks during our pipelined read-ahead mode.
2981 * As a minor side effect, the pipeline enables us to support MTFSFM when
2982 * the filemark is in our internal pipeline even if the tape doesn't
2983 * support spacing over filemarks in the reverse direction.
2985 static int idetape_space_over_filemarks (ide_drive_t
*drive
,short mt_op
,int mt_count
)
2987 idetape_tape_t
*tape
= drive
->driver_data
;
2989 unsigned long flags
;
2991 int sprev
= !!(tape
->caps
[4] & 0x20);
2995 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
2998 mt_count
= - mt_count
;
3001 if (tape
->chrdev_direction
== idetape_direction_read
) {
3003 * We have a read-ahead buffer. Scan it for crossed
3006 tape
->merge_stage_size
= 0;
3007 if (test_and_clear_bit(IDETAPE_FILEMARK
, &tape
->flags
))
3009 while (tape
->first_stage
!= NULL
) {
3010 if (count
== mt_count
) {
3011 if (mt_op
== MTFSFM
)
3012 set_bit(IDETAPE_FILEMARK
, &tape
->flags
);
3015 spin_lock_irqsave(&tape
->spinlock
, flags
);
3016 if (tape
->first_stage
== tape
->active_stage
) {
3018 * We have reached the active stage in the read pipeline.
3019 * There is no point in allowing the drive to continue
3020 * reading any farther, so we stop the pipeline.
3022 * This section should be moved to a separate subroutine,
3023 * because a similar function is performed in
3024 * __idetape_discard_read_pipeline(), for example.
3026 tape
->next_stage
= NULL
;
3027 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
3028 idetape_wait_first_stage(drive
);
3029 tape
->next_stage
= tape
->first_stage
->next
;
3031 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
3032 if (tape
->first_stage
->rq
.errors
== IDETAPE_ERROR_FILEMARK
)
3034 idetape_remove_stage_head(drive
);
3036 idetape_discard_read_pipeline(drive
, 0);
3040 * The filemark was not found in our internal pipeline.
3041 * Now we can issue the space command.
3046 idetape_create_space_cmd(&pc
,mt_count
-count
,IDETAPE_SPACE_OVER_FILEMARK
);
3047 return (idetape_queue_pc_tail(drive
, &pc
));
3052 retval
= idetape_space_over_filemarks(drive
, MTFSF
, mt_count
-count
);
3053 if (retval
) return (retval
);
3054 count
= (MTBSFM
== mt_op
? 1 : -1);
3055 return (idetape_space_over_filemarks(drive
, MTFSF
, count
));
3057 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",mt_op
);
3064 * Our character device read / write functions.
3066 * The tape is optimized to maximize throughput when it is transferring
3067 * an integral number of the "continuous transfer limit", which is
3068 * a parameter of the specific tape (26 KB on my particular tape).
3069 * (32 kB for Onstream)
3071 * As of version 1.3 of the driver, the character device provides an
3072 * abstract continuous view of the media - any mix of block sizes (even 1
3073 * byte) on the same backup/restore procedure is supported. The driver
3074 * will internally convert the requests to the recommended transfer unit,
3075 * so that an unmatch between the user's block size to the recommended
3076 * size will only result in a (slightly) increased driver overhead, but
3077 * will no longer hit performance.
3078 * This is not applicable to Onstream.
3080 static ssize_t
idetape_chrdev_read (struct file
*file
, char __user
*buf
,
3081 size_t count
, loff_t
*ppos
)
3083 struct ide_tape_obj
*tape
= ide_tape_f(file
);
3084 ide_drive_t
*drive
= tape
->drive
;
3085 ssize_t bytes_read
,temp
, actually_read
= 0, rc
;
3087 u16 ctl
= *(u16
*)&tape
->caps
[12];
3089 #if IDETAPE_DEBUG_LOG
3090 if (tape
->debug_level
>= 3)
3091 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_read, count %Zd\n", count
);
3092 #endif /* IDETAPE_DEBUG_LOG */
3094 if (tape
->chrdev_direction
!= idetape_direction_read
) {
3095 if (test_bit(IDETAPE_DETECT_BS
, &tape
->flags
))
3096 if (count
> tape
->tape_block_size
&&
3097 (count
% tape
->tape_block_size
) == 0)
3098 tape
->user_bs_factor
= count
/ tape
->tape_block_size
;
3100 if ((rc
= idetape_initiate_read(drive
, tape
->max_stages
)) < 0)
3104 if (tape
->merge_stage_size
) {
3105 actually_read
= min((unsigned int)(tape
->merge_stage_size
), (unsigned int)count
);
3106 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
, actually_read
))
3108 buf
+= actually_read
;
3109 tape
->merge_stage_size
-= actually_read
;
3110 count
-= actually_read
;
3112 while (count
>= tape
->stage_size
) {
3113 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
3114 if (bytes_read
<= 0)
3116 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
, bytes_read
))
3119 count
-= bytes_read
;
3120 actually_read
+= bytes_read
;
3123 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
3124 if (bytes_read
<= 0)
3126 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
3127 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
, temp
))
3129 actually_read
+= temp
;
3130 tape
->merge_stage_size
= bytes_read
-temp
;
3133 if (!actually_read
&& test_bit(IDETAPE_FILEMARK
, &tape
->flags
)) {
3134 #if IDETAPE_DEBUG_LOG
3135 if (tape
->debug_level
>= 2)
3136 printk(KERN_INFO
"ide-tape: %s: spacing over filemark\n", tape
->name
);
3138 idetape_space_over_filemarks(drive
, MTFSF
, 1);
3142 return (ret
) ? ret
: actually_read
;
3145 static ssize_t
idetape_chrdev_write (struct file
*file
, const char __user
*buf
,
3146 size_t count
, loff_t
*ppos
)
3148 struct ide_tape_obj
*tape
= ide_tape_f(file
);
3149 ide_drive_t
*drive
= tape
->drive
;
3150 ssize_t actually_written
= 0;
3152 u16 ctl
= *(u16
*)&tape
->caps
[12];
3154 /* The drive is write protected. */
3155 if (tape
->write_prot
)
3158 #if IDETAPE_DEBUG_LOG
3159 if (tape
->debug_level
>= 3)
3160 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_write, "
3161 "count %Zd\n", count
);
3162 #endif /* IDETAPE_DEBUG_LOG */
3164 /* Initialize write operation */
3165 if (tape
->chrdev_direction
!= idetape_direction_write
) {
3166 if (tape
->chrdev_direction
== idetape_direction_read
)
3167 idetape_discard_read_pipeline(drive
, 1);
3168 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
3169 printk(KERN_ERR
"ide-tape: merge_stage_size "
3170 "should be 0 now\n");
3171 tape
->merge_stage_size
= 0;
3173 if ((tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 0, 0)) == NULL
)
3175 tape
->chrdev_direction
= idetape_direction_write
;
3176 idetape_init_merge_stage(tape
);
3179 * Issue a write 0 command to ensure that DSC handshake
3180 * is switched from completion mode to buffer available
3182 * No point in issuing this if DSC overlap isn't supported,
3183 * some drives (Seagate STT3401A) will return an error.
3185 if (drive
->dsc_overlap
) {
3186 ssize_t retval
= idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, 0, tape
->merge_stage
->bh
);
3188 __idetape_kfree_stage(tape
->merge_stage
);
3189 tape
->merge_stage
= NULL
;
3190 tape
->chrdev_direction
= idetape_direction_none
;
3197 if (tape
->restart_speed_control_req
)
3198 idetape_restart_speed_control(drive
);
3199 if (tape
->merge_stage_size
) {
3200 if (tape
->merge_stage_size
>= tape
->stage_size
) {
3201 printk(KERN_ERR
"ide-tape: bug: merge buffer too big\n");
3202 tape
->merge_stage_size
= 0;
3204 actually_written
= min((unsigned int)(tape
->stage_size
- tape
->merge_stage_size
), (unsigned int)count
);
3205 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
, actually_written
))
3207 buf
+= actually_written
;
3208 tape
->merge_stage_size
+= actually_written
;
3209 count
-= actually_written
;
3211 if (tape
->merge_stage_size
== tape
->stage_size
) {
3213 tape
->merge_stage_size
= 0;
3214 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
3219 while (count
>= tape
->stage_size
) {
3221 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
, tape
->stage_size
))
3223 buf
+= tape
->stage_size
;
3224 count
-= tape
->stage_size
;
3225 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
3226 actually_written
+= tape
->stage_size
;
3231 actually_written
+= count
;
3232 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
, count
))
3234 tape
->merge_stage_size
+= count
;
3236 return (ret
) ? ret
: actually_written
;
3239 static int idetape_write_filemark (ide_drive_t
*drive
)
3243 /* Write a filemark */
3244 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
3245 if (idetape_queue_pc_tail(drive
, &pc
)) {
3246 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
3253 * idetape_mtioctop is called from idetape_chrdev_ioctl when
3254 * the general mtio MTIOCTOP ioctl is requested.
3256 * We currently support the following mtio.h operations:
3258 * MTFSF - Space over mt_count filemarks in the positive direction.
3259 * The tape is positioned after the last spaced filemark.
3261 * MTFSFM - Same as MTFSF, but the tape is positioned before the
3264 * MTBSF - Steps background over mt_count filemarks, tape is
3265 * positioned before the last filemark.
3267 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark.
3271 * MTBSF and MTBSFM are not supported when the tape doesn't
3272 * support spacing over filemarks in the reverse direction.
3273 * In this case, MTFSFM is also usually not supported (it is
3274 * supported in the rare case in which we crossed the filemark
3275 * during our read-ahead pipelined operation mode).
3277 * MTWEOF - Writes mt_count filemarks. Tape is positioned after
3278 * the last written filemark.
3280 * MTREW - Rewinds tape.
3282 * MTLOAD - Loads the tape.
3284 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and
3285 * MTUNLOAD prevents further access until the media is replaced.
3287 * MTNOP - Flushes tape buffers.
3289 * MTRETEN - Retension media. This typically consists of one end
3290 * to end pass on the media.
3292 * MTEOM - Moves to the end of recorded data.
3294 * MTERASE - Erases tape.
3296 * MTSETBLK - Sets the user block size to mt_count bytes. If
3297 * mt_count is 0, we will attempt to autodetect
3300 * MTSEEK - Positions the tape in a specific block number, where
3301 * each block is assumed to contain which user_block_size
3304 * MTSETPART - Switches to another tape partition.
3306 * MTLOCK - Locks the tape door.
3308 * MTUNLOCK - Unlocks the tape door.
3310 * The following commands are currently not supported:
3312 * MTFSS, MTBSS, MTWSM, MTSETDENSITY,
3313 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD.
3315 static int idetape_mtioctop (ide_drive_t
*drive
,short mt_op
,int mt_count
)
3317 idetape_tape_t
*tape
= drive
->driver_data
;
3321 #if IDETAPE_DEBUG_LOG
3322 if (tape
->debug_level
>= 1)
3323 printk(KERN_INFO
"ide-tape: Handling MTIOCTOP ioctl: "
3324 "mt_op=%d, mt_count=%d\n", mt_op
, mt_count
);
3325 #endif /* IDETAPE_DEBUG_LOG */
3327 * Commands which need our pipelined read-ahead stages.
3336 return (idetape_space_over_filemarks(drive
,mt_op
,mt_count
));
3342 if (tape
->write_prot
)
3344 idetape_discard_read_pipeline(drive
, 1);
3345 for (i
= 0; i
< mt_count
; i
++) {
3346 retval
= idetape_write_filemark(drive
);
3352 idetape_discard_read_pipeline(drive
, 0);
3353 if (idetape_rewind_tape(drive
))
3357 idetape_discard_read_pipeline(drive
, 0);
3358 idetape_create_load_unload_cmd(drive
, &pc
, IDETAPE_LU_LOAD_MASK
);
3359 return (idetape_queue_pc_tail(drive
, &pc
));
3363 * If door is locked, attempt to unlock before
3364 * attempting to eject.
3366 if (tape
->door_locked
) {
3367 if (idetape_create_prevent_cmd(drive
, &pc
, 0))
3368 if (!idetape_queue_pc_tail(drive
, &pc
))
3369 tape
->door_locked
= DOOR_UNLOCKED
;
3371 idetape_discard_read_pipeline(drive
, 0);
3372 idetape_create_load_unload_cmd(drive
, &pc
,!IDETAPE_LU_LOAD_MASK
);
3373 retval
= idetape_queue_pc_tail(drive
, &pc
);
3375 clear_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
);
3378 idetape_discard_read_pipeline(drive
, 0);
3379 return (idetape_flush_tape_buffers(drive
));
3381 idetape_discard_read_pipeline(drive
, 0);
3382 idetape_create_load_unload_cmd(drive
, &pc
,IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
3383 return (idetape_queue_pc_tail(drive
, &pc
));
3385 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
3386 return (idetape_queue_pc_tail(drive
, &pc
));
3388 (void) idetape_rewind_tape(drive
);
3389 idetape_create_erase_cmd(&pc
);
3390 return (idetape_queue_pc_tail(drive
, &pc
));
3393 if (mt_count
< tape
->tape_block_size
|| mt_count
% tape
->tape_block_size
)
3395 tape
->user_bs_factor
= mt_count
/ tape
->tape_block_size
;
3396 clear_bit(IDETAPE_DETECT_BS
, &tape
->flags
);
3398 set_bit(IDETAPE_DETECT_BS
, &tape
->flags
);
3401 idetape_discard_read_pipeline(drive
, 0);
3402 return idetape_position_tape(drive
, mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
3404 idetape_discard_read_pipeline(drive
, 0);
3405 return (idetape_position_tape(drive
, 0, mt_count
, 0));
3409 if (!idetape_create_prevent_cmd(drive
, &pc
, 1))
3411 retval
= idetape_queue_pc_tail(drive
, &pc
);
3412 if (retval
) return retval
;
3413 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
3416 if (!idetape_create_prevent_cmd(drive
, &pc
, 0))
3418 retval
= idetape_queue_pc_tail(drive
, &pc
);
3419 if (retval
) return retval
;
3420 tape
->door_locked
= DOOR_UNLOCKED
;
3423 printk(KERN_ERR
"ide-tape: MTIO operation %d not "
3424 "supported\n", mt_op
);
3430 * Our character device ioctls.
3432 * General mtio.h magnetic io commands are supported here, and not in
3433 * the corresponding block interface.
3435 * The following ioctls are supported:
3437 * MTIOCTOP - Refer to idetape_mtioctop for detailed description.
3439 * MTIOCGET - The mt_dsreg field in the returned mtget structure
3440 * will be set to (user block size in bytes <<
3441 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK.
3443 * The mt_blkno is set to the current user block number.
3444 * The other mtget fields are not supported.
3446 * MTIOCPOS - The current tape "block position" is returned. We
3447 * assume that each block contains user_block_size
3450 * Our own ide-tape ioctls are supported on both interfaces.
3452 static int idetape_chrdev_ioctl (struct inode
*inode
, struct file
*file
, unsigned int cmd
, unsigned long arg
)
3454 struct ide_tape_obj
*tape
= ide_tape_f(file
);
3455 ide_drive_t
*drive
= tape
->drive
;
3459 int block_offset
= 0, position
= tape
->first_frame_position
;
3460 void __user
*argp
= (void __user
*)arg
;
3462 #if IDETAPE_DEBUG_LOG
3463 if (tape
->debug_level
>= 3)
3464 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_ioctl, "
3466 #endif /* IDETAPE_DEBUG_LOG */
3468 tape
->restart_speed_control_req
= 1;
3469 if (tape
->chrdev_direction
== idetape_direction_write
) {
3470 idetape_empty_write_pipeline(drive
);
3471 idetape_flush_tape_buffers(drive
);
3473 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
3474 block_offset
= idetape_pipeline_size(drive
) / (tape
->tape_block_size
* tape
->user_bs_factor
);
3475 if ((position
= idetape_read_position(drive
)) < 0)
3480 if (copy_from_user(&mtop
, argp
, sizeof (struct mtop
)))
3482 return (idetape_mtioctop(drive
,mtop
.mt_op
,mtop
.mt_count
));
3484 memset(&mtget
, 0, sizeof (struct mtget
));
3485 mtget
.mt_type
= MT_ISSCSI2
;
3486 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
3487 mtget
.mt_dsreg
= ((tape
->tape_block_size
* tape
->user_bs_factor
) << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
3488 if (tape
->drv_write_prot
) {
3489 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
3491 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
3495 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
3496 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
3500 if (tape
->chrdev_direction
== idetape_direction_read
)
3501 idetape_discard_read_pipeline(drive
, 1);
3502 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
3506 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t
*drive
);
3509 * Our character device open function.
3511 static int idetape_chrdev_open (struct inode
*inode
, struct file
*filp
)
3513 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
3515 idetape_tape_t
*tape
;
3520 * We really want to do nonseekable_open(inode, filp); here, but some
3521 * versions of tar incorrectly call lseek on tapes and bail out if that
3522 * fails. So we disallow pread() and pwrite(), but permit lseeks.
3524 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
3526 #if IDETAPE_DEBUG_LOG
3527 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_open\n");
3528 #endif /* IDETAPE_DEBUG_LOG */
3530 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
3533 if (!(tape
= ide_tape_chrdev_get(i
)))
3536 drive
= tape
->drive
;
3538 filp
->private_data
= tape
;
3540 if (test_and_set_bit(IDETAPE_BUSY
, &tape
->flags
)) {
3545 retval
= idetape_wait_ready(drive
, 60 * HZ
);
3547 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
3548 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
3552 idetape_read_position(drive
);
3553 if (!test_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
))
3554 (void)idetape_rewind_tape(drive
);
3556 if (tape
->chrdev_direction
!= idetape_direction_read
)
3557 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
3559 /* Read block size and write protect status from drive. */
3560 idetape_get_blocksize_from_block_descriptor(drive
);
3562 /* Set write protect flag if device is opened as read-only. */
3563 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
3564 tape
->write_prot
= 1;
3566 tape
->write_prot
= tape
->drv_write_prot
;
3568 /* Make sure drive isn't write protected if user wants to write. */
3569 if (tape
->write_prot
) {
3570 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
3571 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
3572 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
3579 * Lock the tape drive door so user can't eject.
3581 if (tape
->chrdev_direction
== idetape_direction_none
) {
3582 if (idetape_create_prevent_cmd(drive
, &pc
, 1)) {
3583 if (!idetape_queue_pc_tail(drive
, &pc
)) {
3584 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
3585 tape
->door_locked
= DOOR_LOCKED
;
3589 idetape_restart_speed_control(drive
);
3590 tape
->restart_speed_control_req
= 0;
3598 static void idetape_write_release (ide_drive_t
*drive
, unsigned int minor
)
3600 idetape_tape_t
*tape
= drive
->driver_data
;
3602 idetape_empty_write_pipeline(drive
);
3603 tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 1, 0);
3604 if (tape
->merge_stage
!= NULL
) {
3605 idetape_pad_zeros(drive
, tape
->tape_block_size
* (tape
->user_bs_factor
- 1));
3606 __idetape_kfree_stage(tape
->merge_stage
);
3607 tape
->merge_stage
= NULL
;
3609 idetape_write_filemark(drive
);
3610 idetape_flush_tape_buffers(drive
);
3611 idetape_flush_tape_buffers(drive
);
3615 * Our character device release function.
3617 static int idetape_chrdev_release (struct inode
*inode
, struct file
*filp
)
3619 struct ide_tape_obj
*tape
= ide_tape_f(filp
);
3620 ide_drive_t
*drive
= tape
->drive
;
3622 unsigned int minor
= iminor(inode
);
3625 tape
= drive
->driver_data
;
3626 #if IDETAPE_DEBUG_LOG
3627 if (tape
->debug_level
>= 3)
3628 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_release\n");
3629 #endif /* IDETAPE_DEBUG_LOG */
3631 if (tape
->chrdev_direction
== idetape_direction_write
)
3632 idetape_write_release(drive
, minor
);
3633 if (tape
->chrdev_direction
== idetape_direction_read
) {
3635 idetape_discard_read_pipeline(drive
, 1);
3637 idetape_wait_for_pipeline(drive
);
3639 if (tape
->cache_stage
!= NULL
) {
3640 __idetape_kfree_stage(tape
->cache_stage
);
3641 tape
->cache_stage
= NULL
;
3643 if (minor
< 128 && test_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
))
3644 (void) idetape_rewind_tape(drive
);
3645 if (tape
->chrdev_direction
== idetape_direction_none
) {
3646 if (tape
->door_locked
== DOOR_LOCKED
) {
3647 if (idetape_create_prevent_cmd(drive
, &pc
, 0)) {
3648 if (!idetape_queue_pc_tail(drive
, &pc
))
3649 tape
->door_locked
= DOOR_UNLOCKED
;
3653 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
3660 * idetape_identify_device is called to check the contents of the
3661 * ATAPI IDENTIFY command results. We return:
3663 * 1 If the tape can be supported by us, based on the information
3666 * 0 If this tape driver is not currently supported by us.
3668 static int idetape_identify_device (ide_drive_t
*drive
)
3670 struct idetape_id_gcw gcw
;
3671 struct hd_driveid
*id
= drive
->id
;
3673 if (drive
->id_read
== 0)
3676 *((unsigned short *) &gcw
) = id
->config
;
3678 /* Check that we can support this device */
3680 if (gcw
.protocol
!= 2)
3681 printk(KERN_ERR
"ide-tape: Protocol (0x%02x) is not ATAPI\n",
3683 else if (gcw
.device_type
!= 1)
3684 printk(KERN_ERR
"ide-tape: Device type (0x%02x) is not set "
3685 "to tape\n", gcw
.device_type
);
3686 else if (!gcw
.removable
)
3687 printk(KERN_ERR
"ide-tape: The removable flag is not set\n");
3688 else if (gcw
.packet_size
!= 0) {
3689 printk(KERN_ERR
"ide-tape: Packet size (0x%02x) is not 12 "
3690 "bytes long\n", gcw
.packet_size
);
3696 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
3699 idetape_tape_t
*tape
= drive
->driver_data
;
3702 idetape_create_inquiry_cmd(&pc
);
3703 if (idetape_queue_pc_tail(drive
, &pc
)) {
3704 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
3708 memcpy(tape
->vendor_id
, &pc
.buffer
[8], 8);
3709 memcpy(tape
->product_id
, &pc
.buffer
[16], 16);
3710 memcpy(tape
->firmware_revision
, &pc
.buffer
[32], 4);
3712 ide_fixstring(tape
->vendor_id
, 10, 0);
3713 ide_fixstring(tape
->product_id
, 18, 0);
3714 ide_fixstring(tape
->firmware_revision
, 6, 0);
3715 r
= tape
->firmware_revision
;
3716 if (*(r
+ 1) == '.')
3717 tape
->firmware_revision_num
= (*r
- '0') * 100 +
3718 (*(r
+ 2) - '0') * 10 + *(r
+ 3) - '0';
3719 printk(KERN_INFO
"ide-tape: %s <-> %s: %s %s rev %s\n",
3720 drive
->name
, tape
->name
, tape
->vendor_id
,
3721 tape
->product_id
, tape
->firmware_revision
);
3725 * Ask the tape about its various parameters. In particular, we will adjust our
3726 * data transfer buffer size to the recommended value as returned by the tape.
3728 static void idetape_get_mode_sense_results (ide_drive_t
*drive
)
3730 idetape_tape_t
*tape
= drive
->driver_data
;
3733 u8 speed
, max_speed
;
3735 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
3736 if (idetape_queue_pc_tail(drive
, &pc
)) {
3737 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
3738 " some default values\n");
3739 tape
->tape_block_size
= 512;
3740 put_unaligned(52, (u16
*)&tape
->caps
[12]);
3741 put_unaligned(540, (u16
*)&tape
->caps
[14]);
3742 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
3745 caps
= pc
.buffer
+ 4 + pc
.buffer
[3];
3747 /* convert to host order and save for later use */
3748 speed
= be16_to_cpu(*(u16
*)&caps
[14]);
3749 max_speed
= be16_to_cpu(*(u16
*)&caps
[8]);
3751 put_unaligned(max_speed
, (u16
*)&caps
[8]);
3752 put_unaligned(be16_to_cpu(*(u16
*)&caps
[12]), (u16
*)&caps
[12]);
3753 put_unaligned(speed
, (u16
*)&caps
[14]);
3754 put_unaligned(be16_to_cpu(*(u16
*)&caps
[16]), (u16
*)&caps
[16]);
3757 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
3758 "(assuming 650KB/sec)\n", drive
->name
);
3759 put_unaligned(650, (u16
*)&caps
[14]);
3762 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
3763 "(assuming 650KB/sec)\n", drive
->name
);
3764 put_unaligned(650, (u16
*)&caps
[8]);
3767 memcpy(&tape
->caps
, caps
, 20);
3769 tape
->tape_block_size
= 512;
3770 else if (caps
[7] & 0x04)
3771 tape
->tape_block_size
= 1024;
3775 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor
3776 * and if it succeeds sets the tape block size with the reported value
3778 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t
*drive
)
3781 idetape_tape_t
*tape
= drive
->driver_data
;
3783 idetape_parameter_block_descriptor_t
*block_descrp
;
3785 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
3786 if (idetape_queue_pc_tail(drive
, &pc
)) {
3787 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
3788 if (tape
->tape_block_size
== 0) {
3789 printk(KERN_WARNING
"ide-tape: Cannot deal with zero block size, assume 32k\n");
3790 tape
->tape_block_size
= 32768;
3794 block_descrp
= (idetape_parameter_block_descriptor_t
*)(pc
.buffer
+ 4);
3795 tape
->tape_block_size
=( block_descrp
->length
[0]<<16) + (block_descrp
->length
[1]<<8) + block_descrp
->length
[2];
3796 tape
->drv_write_prot
= (pc
.buffer
[2] & 0x80) >> 7;
3799 #ifdef CONFIG_IDE_PROC_FS
3800 static void idetape_add_settings (ide_drive_t
*drive
)
3802 idetape_tape_t
*tape
= drive
->driver_data
;
3805 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
3807 ide_add_setting(drive
, "buffer", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
3808 1, 2, (u16
*)&tape
->caps
[16], NULL
);
3809 ide_add_setting(drive
, "pipeline_min", SETTING_RW
, TYPE_INT
, 1, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->min_pipeline
, NULL
);
3810 ide_add_setting(drive
, "pipeline", SETTING_RW
, TYPE_INT
, 1, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->max_stages
, NULL
);
3811 ide_add_setting(drive
, "pipeline_max", SETTING_RW
, TYPE_INT
, 1, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->max_pipeline
, NULL
);
3812 ide_add_setting(drive
, "pipeline_used", SETTING_READ
, TYPE_INT
, 0, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->nr_stages
, NULL
);
3813 ide_add_setting(drive
, "pipeline_pending", SETTING_READ
, TYPE_INT
, 0, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->nr_pending_stages
, NULL
);
3814 ide_add_setting(drive
, "speed", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
3815 1, 1, (u16
*)&tape
->caps
[14], NULL
);
3816 ide_add_setting(drive
, "stage", SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1024, &tape
->stage_size
, NULL
);
3817 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
);
3818 ide_add_setting(drive
, "dsc_overlap", SETTING_RW
, TYPE_BYTE
, 0, 1, 1, 1, &drive
->dsc_overlap
, NULL
);
3819 ide_add_setting(drive
, "pipeline_head_speed_c",SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->controlled_pipeline_head_speed
, NULL
);
3820 ide_add_setting(drive
, "pipeline_head_speed_u",SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->uncontrolled_pipeline_head_speed
,NULL
);
3821 ide_add_setting(drive
, "avg_speed", SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->avg_speed
, NULL
);
3822 ide_add_setting(drive
, "debug_level", SETTING_RW
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->debug_level
, NULL
);
3825 static inline void idetape_add_settings(ide_drive_t
*drive
) { ; }
3829 * ide_setup is called to:
3831 * 1. Initialize our various state variables.
3832 * 2. Ask the tape for its capabilities.
3833 * 3. Allocate a buffer which will be used for data
3834 * transfer. The buffer size is chosen based on
3835 * the recommendation which we received in step (2).
3837 * Note that at this point ide.c already assigned us an irq, so that
3838 * we can queue requests here and wait for their completion.
3840 static void idetape_setup (ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
3842 unsigned long t1
, tmid
, tn
, t
;
3844 struct idetape_id_gcw gcw
;
3847 u16
*ctl
= (u16
*)&tape
->caps
[12];
3849 spin_lock_init(&tape
->spinlock
);
3850 drive
->dsc_overlap
= 1;
3851 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
3852 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
3854 drive
->dsc_overlap
= 0;
3856 /* Seagate Travan drives do not support DSC overlap. */
3857 if (strstr(drive
->id
->model
, "Seagate STT3401"))
3858 drive
->dsc_overlap
= 0;
3859 tape
->minor
= minor
;
3860 tape
->name
[0] = 'h';
3861 tape
->name
[1] = 't';
3862 tape
->name
[2] = '0' + minor
;
3863 tape
->chrdev_direction
= idetape_direction_none
;
3864 tape
->pc
= tape
->pc_stack
;
3865 tape
->max_insert_speed
= 10000;
3866 tape
->speed_control
= 1;
3867 *((unsigned short *) &gcw
) = drive
->id
->config
;
3868 if (gcw
.drq_type
== 1)
3869 set_bit(IDETAPE_DRQ_INTERRUPT
, &tape
->flags
);
3871 tape
->min_pipeline
= tape
->max_pipeline
= tape
->max_stages
= 10;
3873 idetape_get_inquiry_results(drive
);
3874 idetape_get_mode_sense_results(drive
);
3875 idetape_get_blocksize_from_block_descriptor(drive
);
3876 tape
->user_bs_factor
= 1;
3877 tape
->stage_size
= *ctl
* tape
->tape_block_size
;
3878 while (tape
->stage_size
> 0xffff) {
3879 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
3881 tape
->stage_size
= *ctl
* tape
->tape_block_size
;
3883 stage_size
= tape
->stage_size
;
3884 tape
->pages_per_stage
= stage_size
/ PAGE_SIZE
;
3885 if (stage_size
% PAGE_SIZE
) {
3886 tape
->pages_per_stage
++;
3887 tape
->excess_bh_size
= PAGE_SIZE
- stage_size
% PAGE_SIZE
;
3890 /* Select the "best" DSC read/write polling freq and pipeline size. */
3891 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
3893 tape
->max_stages
= speed
* 1000 * 10 / tape
->stage_size
;
3896 * Limit memory use for pipeline to 10% of physical memory
3899 if (tape
->max_stages
* tape
->stage_size
> si
.totalram
* si
.mem_unit
/ 10)
3900 tape
->max_stages
= si
.totalram
* si
.mem_unit
/ (10 * tape
->stage_size
);
3901 tape
->max_stages
= min(tape
->max_stages
, IDETAPE_MAX_PIPELINE_STAGES
);
3902 tape
->min_pipeline
= min(tape
->max_stages
, IDETAPE_MIN_PIPELINE_STAGES
);
3903 tape
->max_pipeline
= min(tape
->max_stages
* 2, IDETAPE_MAX_PIPELINE_STAGES
);
3904 if (tape
->max_stages
== 0)
3905 tape
->max_stages
= tape
->min_pipeline
= tape
->max_pipeline
= 1;
3907 t1
= (tape
->stage_size
* HZ
) / (speed
* 1000);
3908 tmid
= (*(u16
*)&tape
->caps
[16] * 32 * HZ
) / (speed
* 125);
3909 tn
= (IDETAPE_FIFO_THRESHOLD
* tape
->stage_size
* HZ
) / (speed
* 1000);
3911 if (tape
->max_stages
)
3917 * Ensure that the number we got makes sense; limit
3918 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
3920 tape
->best_dsc_rw_frequency
= max_t(unsigned long, min_t(unsigned long, t
, IDETAPE_DSC_RW_MAX
), IDETAPE_DSC_RW_MIN
);
3921 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
3922 "%dkB pipeline, %lums tDSC%s\n",
3923 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
3924 (*(u16
*)&tape
->caps
[16] * 512) / tape
->stage_size
,
3925 tape
->stage_size
/ 1024,
3926 tape
->max_stages
* tape
->stage_size
/ 1024,
3927 tape
->best_dsc_rw_frequency
* 1000 / HZ
,
3928 drive
->using_dma
? ", DMA":"");
3930 idetape_add_settings(drive
);
3933 static void ide_tape_remove(ide_drive_t
*drive
)
3935 idetape_tape_t
*tape
= drive
->driver_data
;
3937 ide_proc_unregister_driver(drive
, tape
->driver
);
3939 ide_unregister_region(tape
->disk
);
3944 static void ide_tape_release(struct kref
*kref
)
3946 struct ide_tape_obj
*tape
= to_ide_tape(kref
);
3947 ide_drive_t
*drive
= tape
->drive
;
3948 struct gendisk
*g
= tape
->disk
;
3950 BUG_ON(tape
->first_stage
!= NULL
|| tape
->merge_stage_size
);
3952 drive
->dsc_overlap
= 0;
3953 drive
->driver_data
= NULL
;
3954 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
3955 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
3956 idetape_devs
[tape
->minor
] = NULL
;
3957 g
->private_data
= NULL
;
3962 #ifdef CONFIG_IDE_PROC_FS
3963 static int proc_idetape_read_name
3964 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
3966 ide_drive_t
*drive
= (ide_drive_t
*) data
;
3967 idetape_tape_t
*tape
= drive
->driver_data
;
3971 len
= sprintf(out
, "%s\n", tape
->name
);
3972 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
3975 static ide_proc_entry_t idetape_proc
[] = {
3976 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
3977 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
3978 { NULL
, 0, NULL
, NULL
}
3982 static int ide_tape_probe(ide_drive_t
*);
3984 static ide_driver_t idetape_driver
= {
3986 .owner
= THIS_MODULE
,
3988 .bus
= &ide_bus_type
,
3990 .probe
= ide_tape_probe
,
3991 .remove
= ide_tape_remove
,
3992 .version
= IDETAPE_VERSION
,
3994 .supports_dsc_overlap
= 1,
3995 .do_request
= idetape_do_request
,
3996 .end_request
= idetape_end_request
,
3997 .error
= __ide_error
,
3998 .abort
= __ide_abort
,
3999 #ifdef CONFIG_IDE_PROC_FS
4000 .proc
= idetape_proc
,
4005 * Our character device supporting functions, passed to register_chrdev.
4007 static const struct file_operations idetape_fops
= {
4008 .owner
= THIS_MODULE
,
4009 .read
= idetape_chrdev_read
,
4010 .write
= idetape_chrdev_write
,
4011 .ioctl
= idetape_chrdev_ioctl
,
4012 .open
= idetape_chrdev_open
,
4013 .release
= idetape_chrdev_release
,
4016 static int idetape_open(struct inode
*inode
, struct file
*filp
)
4018 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
4019 struct ide_tape_obj
*tape
;
4021 if (!(tape
= ide_tape_get(disk
)))
4027 static int idetape_release(struct inode
*inode
, struct file
*filp
)
4029 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
4030 struct ide_tape_obj
*tape
= ide_tape_g(disk
);
4037 static int idetape_ioctl(struct inode
*inode
, struct file
*file
,
4038 unsigned int cmd
, unsigned long arg
)
4040 struct block_device
*bdev
= inode
->i_bdev
;
4041 struct ide_tape_obj
*tape
= ide_tape_g(bdev
->bd_disk
);
4042 ide_drive_t
*drive
= tape
->drive
;
4043 int err
= generic_ide_ioctl(drive
, file
, bdev
, cmd
, arg
);
4045 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
4049 static struct block_device_operations idetape_block_ops
= {
4050 .owner
= THIS_MODULE
,
4051 .open
= idetape_open
,
4052 .release
= idetape_release
,
4053 .ioctl
= idetape_ioctl
,
4056 static int ide_tape_probe(ide_drive_t
*drive
)
4058 idetape_tape_t
*tape
;
4062 if (!strstr("ide-tape", drive
->driver_req
))
4064 if (!drive
->present
)
4066 if (drive
->media
!= ide_tape
)
4068 if (!idetape_identify_device (drive
)) {
4069 printk(KERN_ERR
"ide-tape: %s: not supported by this version of ide-tape\n", drive
->name
);
4073 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive
->name
);
4076 if (strstr(drive
->id
->model
, "OnStream DI-")) {
4077 printk(KERN_WARNING
"ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive
->name
);
4078 printk(KERN_WARNING
"ide-tape: OnStream support will be removed soon from ide-tape!\n");
4080 tape
= kzalloc(sizeof (idetape_tape_t
), GFP_KERNEL
);
4082 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape structure\n", drive
->name
);
4086 g
= alloc_disk(1 << PARTN_BITS
);
4090 ide_init_disk(g
, drive
);
4092 ide_proc_register_driver(drive
, &idetape_driver
);
4094 kref_init(&tape
->kref
);
4096 tape
->drive
= drive
;
4097 tape
->driver
= &idetape_driver
;
4100 g
->private_data
= &tape
->driver
;
4102 drive
->driver_data
= tape
;
4104 mutex_lock(&idetape_ref_mutex
);
4105 for (minor
= 0; idetape_devs
[minor
]; minor
++)
4107 idetape_devs
[minor
] = tape
;
4108 mutex_unlock(&idetape_ref_mutex
);
4110 idetape_setup(drive
, tape
, minor
);
4112 device_create(idetape_sysfs_class
, &drive
->gendev
,
4113 MKDEV(IDETAPE_MAJOR
, minor
), "%s", tape
->name
);
4114 device_create(idetape_sysfs_class
, &drive
->gendev
,
4115 MKDEV(IDETAPE_MAJOR
, minor
+ 128), "n%s", tape
->name
);
4117 g
->fops
= &idetape_block_ops
;
4118 ide_register_region(g
);
4128 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
4129 MODULE_LICENSE("GPL");
4131 static void __exit
idetape_exit (void)
4133 driver_unregister(&idetape_driver
.gen_driver
);
4134 class_destroy(idetape_sysfs_class
);
4135 unregister_chrdev(IDETAPE_MAJOR
, "ht");
4138 static int __init
idetape_init(void)
4141 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
4142 if (IS_ERR(idetape_sysfs_class
)) {
4143 idetape_sysfs_class
= NULL
;
4144 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
4149 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
4150 printk(KERN_ERR
"ide-tape: Failed to register character device interface\n");
4152 goto out_free_class
;
4155 error
= driver_register(&idetape_driver
.gen_driver
);
4157 goto out_free_driver
;
4162 driver_unregister(&idetape_driver
.gen_driver
);
4164 class_destroy(idetape_sysfs_class
);
4169 MODULE_ALIAS("ide:*m-tape*");
4170 module_init(idetape_init
);
4171 module_exit(idetape_exit
);
4172 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);