2 * IDE ATAPI streaming tape driver.
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
18 #define IDETAPE_VERSION "1.20"
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/timer.h>
27 #include <linux/interrupt.h>
28 #include <linux/jiffies.h>
29 #include <linux/major.h>
30 #include <linux/errno.h>
31 #include <linux/genhd.h>
32 #include <linux/slab.h>
33 #include <linux/pci.h>
34 #include <linux/ide.h>
35 #include <linux/smp_lock.h>
36 #include <linux/completion.h>
37 #include <linux/bitops.h>
38 #include <linux/mutex.h>
39 #include <scsi/scsi.h>
41 #include <asm/byteorder.h>
42 #include <linux/irq.h>
43 #include <linux/uaccess.h>
45 #include <asm/unaligned.h>
46 #include <linux/mtio.h>
49 /* output errors only */
51 /* output all sense key/asc */
53 /* info regarding all chrdev-related procedures */
54 DBG_CHRDEV
= (1 << 2),
55 /* all remaining procedures */
57 /* buffer alloc info (pc_stack & rq_stack) */
58 DBG_PCRQ_STACK
= (1 << 4),
61 /* define to see debug info */
62 #define IDETAPE_DEBUG_LOG 0
65 #define debug_log(lvl, fmt, args...) \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
71 #define debug_log(lvl, fmt, args...) do {} while (0)
74 /**************************** Tunable parameters *****************************/
78 * Pipelined mode parameters.
80 * We try to use the minimum number of stages which is enough to keep the tape
81 * constantly streaming. To accomplish that, we implement a feedback loop around
82 * the maximum number of stages:
84 * We start from MIN maximum stages (we will not even use MIN stages if we don't
85 * need them), increment it by RATE*(MAX-MIN) whenever we sense that the
86 * pipeline is empty, until we reach the optimum value or until we reach MAX.
88 * Setting the following parameter to 0 is illegal: the pipelined mode cannot be
89 * disabled (idetape_calculate_speeds() divides by tape->max_stages.)
91 #define IDETAPE_MIN_PIPELINE_STAGES 1
92 #define IDETAPE_MAX_PIPELINE_STAGES 400
93 #define IDETAPE_INCREASE_STAGES_RATE 20
96 * After each failed packet command we issue a request sense command and retry
97 * the packet command IDETAPE_MAX_PC_RETRIES times.
99 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
101 #define IDETAPE_MAX_PC_RETRIES 3
104 * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE
105 * bytes. This is used for several packet commands (Not for READ/WRITE commands)
107 #define IDETAPE_PC_BUFFER_SIZE 256
110 * In various places in the driver, we need to allocate storage
111 * for packet commands and requests, which will remain valid while
112 * we leave the driver to wait for an interrupt or a timeout event.
114 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
117 * Some drives (for example, Seagate STT3401A Travan) require a very long
118 * timeout, because they don't return an interrupt or clear their busy bit
119 * until after the command completes (even retension commands).
121 #define IDETAPE_WAIT_CMD (900*HZ)
124 * The following parameter is used to select the point in the internal tape fifo
125 * in which we will start to refill the buffer. Decreasing the following
126 * parameter will improve the system's latency and interactive response, while
127 * using a high value might improve system throughput.
129 #define IDETAPE_FIFO_THRESHOLD 2
132 * DSC polling parameters.
134 * Polling for DSC (a single bit in the status register) is a very important
135 * function in ide-tape. There are two cases in which we poll for DSC:
137 * 1. Before a read/write packet command, to ensure that we can transfer data
138 * from/to the tape's data buffers, without causing an actual media access.
139 * In case the tape is not ready yet, we take out our request from the device
140 * request queue, so that ide.c could service requests from the other device
141 * on the same interface in the meantime.
143 * 2. After the successful initialization of a "media access packet command",
144 * which is a command that can take a long time to complete (the interval can
145 * range from several seconds to even an hour). Again, we postpone our request
146 * in the middle to free the bus for the other device. The polling frequency
147 * here should be lower than the read/write frequency since those media access
148 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
149 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
150 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
152 * We also set a timeout for the timer, in case something goes wrong. The
153 * timeout should be longer then the maximum execution time of a tape operation.
157 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
158 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
159 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
160 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
161 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
162 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
163 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
165 /*************************** End of tunable parameters ***********************/
167 /* Read/Write error simulation */
168 #define SIMULATE_ERRORS 0
170 /* tape directions */
172 IDETAPE_DIR_NONE
= (1 << 0),
173 IDETAPE_DIR_READ
= (1 << 1),
174 IDETAPE_DIR_WRITE
= (1 << 2),
180 struct idetape_bh
*b_reqnext
;
184 typedef struct idetape_packet_command_s
{
185 /* Actual packet bytes */
187 /* On each retry, we increment retries */
191 /* Bytes to transfer */
192 int request_transfer
;
193 /* Bytes actually transferred */
194 int actually_transferred
;
195 /* Size of our data buffer */
197 struct idetape_bh
*bh
;
202 /* Pointer into the above buffer */
203 u8
*current_position
;
204 /* Called when this packet command is completed */
205 ide_startstop_t (*callback
) (ide_drive_t
*);
206 /* Temporary buffer */
207 u8 pc_buffer
[IDETAPE_PC_BUFFER_SIZE
];
208 /* Status/Action bit flags: long for set_bit */
213 * Packet command flag bits.
215 /* Set when an error is considered normal - We won't retry */
217 /* 1 When polling for DSC on a media access command */
218 #define PC_WAIT_FOR_DSC 1
219 /* 1 when we prefer to use DMA if possible */
220 #define PC_DMA_RECOMMENDED 2
221 /* 1 while DMA in progress */
222 #define PC_DMA_IN_PROGRESS 3
223 /* 1 when encountered problem during DMA */
224 #define PC_DMA_ERROR 4
228 /* A pipeline stage. */
229 typedef struct idetape_stage_s
{
230 struct request rq
; /* The corresponding request */
231 struct idetape_bh
*bh
; /* The data buffers */
232 struct idetape_stage_s
*next
; /* Pointer to the next stage */
236 * Most of our global data which we need to save even as we leave the driver due
237 * to an interrupt or a timer event is stored in the struct defined below.
239 typedef struct ide_tape_obj
{
241 ide_driver_t
*driver
;
242 struct gendisk
*disk
;
246 * Since a typical character device operation requires more
247 * than one packet command, we provide here enough memory
248 * for the maximum of interconnected packet commands.
249 * The packet commands are stored in the circular array pc_stack.
250 * pc_stack_index points to the last used entry, and warps around
251 * to the start when we get to the last array entry.
253 * pc points to the current processed packet command.
255 * failed_pc points to the last failed packet command, or contains
256 * NULL if we do not need to retry any packet command. This is
257 * required since an additional packet command is needed before the
258 * retry, to get detailed information on what went wrong.
260 /* Current packet command */
262 /* Last failed packet command */
263 idetape_pc_t
*failed_pc
;
264 /* Packet command stack */
265 idetape_pc_t pc_stack
[IDETAPE_PC_STACK
];
266 /* Next free packet command storage space */
268 struct request rq_stack
[IDETAPE_PC_STACK
];
269 /* We implement a circular array */
273 * DSC polling variables.
275 * While polling for DSC we use postponed_rq to postpone the current
276 * request so that ide.c will be able to service pending requests on the
277 * other device. Note that at most we will have only one DSC (usually
278 * data transfer) request in the device request queue. Additional
279 * requests can be queued in our internal pipeline, but they will be
280 * visible to ide.c only one at a time.
282 struct request
*postponed_rq
;
283 /* The time in which we started polling for DSC */
284 unsigned long dsc_polling_start
;
285 /* Timer used to poll for dsc */
286 struct timer_list dsc_timer
;
287 /* Read/Write dsc polling frequency */
288 unsigned long best_dsc_rw_freq
;
289 unsigned long dsc_poll_freq
;
290 unsigned long dsc_timeout
;
292 /* Read position information */
295 unsigned int first_frame
;
297 /* Last error information */
298 u8 sense_key
, asc
, ascq
;
300 /* Character device operation */
304 /* Current character device data transfer direction */
307 /* tape block size, usually 512 or 1024 bytes */
308 unsigned short blk_size
;
311 /* Copy of the tape's Capabilities and Mechanical Page */
315 * Active data transfer request parameters.
317 * At most, there is only one ide-tape originated data transfer request
318 * in the device request queue. This allows ide.c to easily service
319 * requests from the other device when we postpone our active request.
320 * In the pipelined operation mode, we use our internal pipeline
321 * structure to hold more data requests. The data buffer size is chosen
322 * based on the tape's recommendation.
324 /* ptr to the request which is waiting in the device request queue */
325 struct request
*active_data_rq
;
326 /* Data buffer size chosen based on the tape's recommendation */
328 idetape_stage_t
*merge_stage
;
329 int merge_stage_size
;
330 struct idetape_bh
*bh
;
335 * Pipeline parameters.
337 * To accomplish non-pipelined mode, we simply set the following
338 * variables to zero (or NULL, where appropriate).
340 /* Number of currently used stages */
342 /* Number of pending stages */
343 int nr_pending_stages
;
344 /* We will not allocate more than this number of stages */
345 int max_stages
, min_pipeline
, max_pipeline
;
346 /* The first stage which will be removed from the pipeline */
347 idetape_stage_t
*first_stage
;
348 /* The currently active stage */
349 idetape_stage_t
*active_stage
;
350 /* Will be serviced after the currently active request */
351 idetape_stage_t
*next_stage
;
352 /* New requests will be added to the pipeline here */
353 idetape_stage_t
*last_stage
;
354 /* Optional free stage which we can use */
355 idetape_stage_t
*cache_stage
;
357 /* Wasted space in each stage */
360 /* Status/Action flags: long for set_bit */
362 /* protects the ide-tape queue */
365 /* Measures average tape speed */
366 unsigned long avg_time
;
370 /* the door is currently locked */
372 /* the tape hardware is write protected */
374 /* the tape is write protected (hardware or opened as read-only) */
378 * Limit the number of times a request can be postponed, to avoid an
379 * infinite postpone deadlock.
384 * Measures number of frames:
386 * 1. written/read to/from the driver pipeline (pipeline_head).
387 * 2. written/read to/from the tape buffers (idetape_bh).
388 * 3. written/read by the tape to/from the media (tape_head).
395 /* Speed control at the tape buffers input/output */
396 unsigned long insert_time
;
399 int max_insert_speed
;
400 int measure_insert_time
;
402 /* Speed regulation negative feedback loop */
404 int pipeline_head_speed
;
405 int controlled_pipeline_head_speed
;
406 int uncontrolled_pipeline_head_speed
;
407 int controlled_last_pipeline_head
;
408 unsigned long uncontrolled_pipeline_head_time
;
409 unsigned long controlled_pipeline_head_time
;
410 int controlled_previous_pipeline_head
;
411 int uncontrolled_previous_pipeline_head
;
412 unsigned long controlled_previous_head_time
;
413 unsigned long uncontrolled_previous_head_time
;
414 int restart_speed_control_req
;
419 static DEFINE_MUTEX(idetape_ref_mutex
);
421 static struct class *idetape_sysfs_class
;
423 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
425 #define ide_tape_g(disk) \
426 container_of((disk)->private_data, struct ide_tape_obj, driver)
428 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
430 struct ide_tape_obj
*tape
= NULL
;
432 mutex_lock(&idetape_ref_mutex
);
433 tape
= ide_tape_g(disk
);
435 kref_get(&tape
->kref
);
436 mutex_unlock(&idetape_ref_mutex
);
440 static void ide_tape_release(struct kref
*);
442 static void ide_tape_put(struct ide_tape_obj
*tape
)
444 mutex_lock(&idetape_ref_mutex
);
445 kref_put(&tape
->kref
, ide_tape_release
);
446 mutex_unlock(&idetape_ref_mutex
);
449 /* Tape door status */
450 #define DOOR_UNLOCKED 0
451 #define DOOR_LOCKED 1
452 #define DOOR_EXPLICITLY_LOCKED 2
455 * Tape flag bits values.
457 #define IDETAPE_IGNORE_DSC 0
458 #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
459 #define IDETAPE_BUSY 2 /* Device already opened */
460 #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
461 #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
462 #define IDETAPE_FILEMARK 5 /* Currently on a filemark */
463 #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
464 #define IDETAPE_READ_ERROR 7
465 #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
466 /* 0 = no tape is loaded, so we don't rewind after ejecting */
467 #define IDETAPE_MEDIUM_PRESENT 9
469 /* Some defines for the SPACE command */
470 #define IDETAPE_SPACE_OVER_FILEMARK 1
471 #define IDETAPE_SPACE_TO_EOD 3
473 /* Some defines for the LOAD UNLOAD command */
474 #define IDETAPE_LU_LOAD_MASK 1
475 #define IDETAPE_LU_RETENSION_MASK 2
476 #define IDETAPE_LU_EOT_MASK 4
479 * Special requests for our block device strategy routine.
481 * In order to service a character device command, we add special requests to
482 * the tail of our block device request queue and wait for their completion.
486 REQ_IDETAPE_PC1
= (1 << 0), /* packet command (first stage) */
487 REQ_IDETAPE_PC2
= (1 << 1), /* packet command (second stage) */
488 REQ_IDETAPE_READ
= (1 << 2),
489 REQ_IDETAPE_WRITE
= (1 << 3),
492 /* Error codes returned in rq->errors to the higher part of the driver. */
493 #define IDETAPE_ERROR_GENERAL 101
494 #define IDETAPE_ERROR_FILEMARK 102
495 #define IDETAPE_ERROR_EOD 103
497 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
498 #define IDETAPE_BLOCK_DESCRIPTOR 0
499 #define IDETAPE_CAPABILITIES_PAGE 0x2a
502 * The variables below are used for the character device interface. Additional
503 * state variables are defined in our ide_drive_t structure.
505 static struct ide_tape_obj
*idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
507 #define ide_tape_f(file) ((file)->private_data)
509 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
511 struct ide_tape_obj
*tape
= NULL
;
513 mutex_lock(&idetape_ref_mutex
);
514 tape
= idetape_devs
[i
];
516 kref_get(&tape
->kref
);
517 mutex_unlock(&idetape_ref_mutex
);
521 static void idetape_input_buffers(ide_drive_t
*drive
, idetape_pc_t
*pc
,
524 struct idetape_bh
*bh
= pc
->bh
;
529 printk(KERN_ERR
"ide-tape: bh == NULL in "
530 "idetape_input_buffers\n");
531 ide_atapi_discard_data(drive
, bcount
);
535 (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)),
537 HWIF(drive
)->atapi_input_bytes(drive
, bh
->b_data
+
538 atomic_read(&bh
->b_count
), count
);
540 atomic_add(count
, &bh
->b_count
);
541 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
544 atomic_set(&bh
->b_count
, 0);
550 static void idetape_output_buffers(ide_drive_t
*drive
, idetape_pc_t
*pc
,
553 struct idetape_bh
*bh
= pc
->bh
;
558 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
562 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
563 HWIF(drive
)->atapi_output_bytes(drive
, pc
->b_data
, count
);
566 pc
->b_count
-= count
;
571 pc
->b_data
= bh
->b_data
;
572 pc
->b_count
= atomic_read(&bh
->b_count
);
578 static void idetape_update_buffers(idetape_pc_t
*pc
)
580 struct idetape_bh
*bh
= pc
->bh
;
582 unsigned int bcount
= pc
->actually_transferred
;
584 if (test_bit(PC_WRITING
, &pc
->flags
))
588 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
592 count
= min((unsigned int)bh
->b_size
, (unsigned int)bcount
);
593 atomic_set(&bh
->b_count
, count
);
594 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
602 * idetape_next_pc_storage returns a pointer to a place in which we can
603 * safely store a packet command, even though we intend to leave the
604 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
605 * commands is allocated at initialization time.
607 static idetape_pc_t
*idetape_next_pc_storage(ide_drive_t
*drive
)
609 idetape_tape_t
*tape
= drive
->driver_data
;
611 debug_log(DBG_PCRQ_STACK
, "pc_stack_index=%d\n", tape
->pc_stack_index
);
613 if (tape
->pc_stack_index
== IDETAPE_PC_STACK
)
614 tape
->pc_stack_index
= 0;
615 return (&tape
->pc_stack
[tape
->pc_stack_index
++]);
619 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
620 * Since we queue packet commands in the request queue, we need to
621 * allocate a request, along with the allocation of a packet command.
624 /**************************************************************
626 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
627 * followed later on by kfree(). -ml *
629 **************************************************************/
631 static struct request
*idetape_next_rq_storage(ide_drive_t
*drive
)
633 idetape_tape_t
*tape
= drive
->driver_data
;
635 debug_log(DBG_PCRQ_STACK
, "rq_stack_index=%d\n", tape
->rq_stack_index
);
637 if (tape
->rq_stack_index
== IDETAPE_PC_STACK
)
638 tape
->rq_stack_index
= 0;
639 return (&tape
->rq_stack
[tape
->rq_stack_index
++]);
642 static void idetape_init_pc(idetape_pc_t
*pc
)
644 memset(pc
->c
, 0, 12);
647 pc
->request_transfer
= 0;
648 pc
->buffer
= pc
->pc_buffer
;
649 pc
->buffer_size
= IDETAPE_PC_BUFFER_SIZE
;
655 * called on each failed packet command retry to analyze the request sense. We
656 * currently do not utilize this information.
658 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
660 idetape_tape_t
*tape
= drive
->driver_data
;
661 idetape_pc_t
*pc
= tape
->failed_pc
;
663 tape
->sense_key
= sense
[2] & 0xF;
664 tape
->asc
= sense
[12];
665 tape
->ascq
= sense
[13];
667 debug_log(DBG_ERR
, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
668 pc
->c
[0], tape
->sense_key
, tape
->asc
, tape
->ascq
);
670 /* Correct pc->actually_transferred by asking the tape. */
671 if (test_bit(PC_DMA_ERROR
, &pc
->flags
)) {
672 pc
->actually_transferred
= pc
->request_transfer
-
674 be32_to_cpu(get_unaligned((u32
*)&sense
[3]));
675 idetape_update_buffers(pc
);
679 * If error was the result of a zero-length read or write command,
680 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
681 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
683 if ((pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
)
685 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
686 if (tape
->sense_key
== 5) {
687 /* don't report an error, everything's ok */
689 /* don't retry read/write */
690 set_bit(PC_ABORT
, &pc
->flags
);
693 if (pc
->c
[0] == READ_6
&& (sense
[2] & 0x80)) {
694 pc
->error
= IDETAPE_ERROR_FILEMARK
;
695 set_bit(PC_ABORT
, &pc
->flags
);
697 if (pc
->c
[0] == WRITE_6
) {
698 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
699 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
700 pc
->error
= IDETAPE_ERROR_EOD
;
701 set_bit(PC_ABORT
, &pc
->flags
);
704 if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
705 if (tape
->sense_key
== 8) {
706 pc
->error
= IDETAPE_ERROR_EOD
;
707 set_bit(PC_ABORT
, &pc
->flags
);
709 if (!test_bit(PC_ABORT
, &pc
->flags
) &&
710 pc
->actually_transferred
)
711 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
715 static void idetape_activate_next_stage(ide_drive_t
*drive
)
717 idetape_tape_t
*tape
= drive
->driver_data
;
718 idetape_stage_t
*stage
= tape
->next_stage
;
719 struct request
*rq
= &stage
->rq
;
721 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
724 printk(KERN_ERR
"ide-tape: bug: Trying to activate a non"
725 " existing stage\n");
729 rq
->rq_disk
= tape
->disk
;
731 rq
->special
= (void *)stage
->bh
;
732 tape
->active_data_rq
= rq
;
733 tape
->active_stage
= stage
;
734 tape
->next_stage
= stage
->next
;
737 /* Free a stage along with its related buffers completely. */
738 static void __idetape_kfree_stage(idetape_stage_t
*stage
)
740 struct idetape_bh
*prev_bh
, *bh
= stage
->bh
;
744 if (bh
->b_data
!= NULL
) {
745 size
= (int) bh
->b_size
;
747 free_page((unsigned long) bh
->b_data
);
749 bh
->b_data
+= PAGE_SIZE
;
759 static void idetape_kfree_stage(idetape_tape_t
*tape
, idetape_stage_t
*stage
)
761 __idetape_kfree_stage(stage
);
765 * Remove tape->first_stage from the pipeline. The caller should avoid race
768 static void idetape_remove_stage_head(ide_drive_t
*drive
)
770 idetape_tape_t
*tape
= drive
->driver_data
;
771 idetape_stage_t
*stage
;
773 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
775 if (tape
->first_stage
== NULL
) {
776 printk(KERN_ERR
"ide-tape: bug: tape->first_stage is NULL\n");
779 if (tape
->active_stage
== tape
->first_stage
) {
780 printk(KERN_ERR
"ide-tape: bug: Trying to free our active "
784 stage
= tape
->first_stage
;
785 tape
->first_stage
= stage
->next
;
786 idetape_kfree_stage(tape
, stage
);
788 if (tape
->first_stage
== NULL
) {
789 tape
->last_stage
= NULL
;
790 if (tape
->next_stage
!= NULL
)
791 printk(KERN_ERR
"ide-tape: bug: tape->next_stage !="
794 printk(KERN_ERR
"ide-tape: bug: nr_stages should be 0 "
800 * This will free all the pipeline stages starting from new_last_stage->next
801 * to the end of the list, and point tape->last_stage to new_last_stage.
803 static void idetape_abort_pipeline(ide_drive_t
*drive
,
804 idetape_stage_t
*new_last_stage
)
806 idetape_tape_t
*tape
= drive
->driver_data
;
807 idetape_stage_t
*stage
= new_last_stage
->next
;
808 idetape_stage_t
*nstage
;
810 debug_log(DBG_PROCS
, "%s: Enter %s\n", tape
->name
, __func__
);
813 nstage
= stage
->next
;
814 idetape_kfree_stage(tape
, stage
);
816 --tape
->nr_pending_stages
;
820 new_last_stage
->next
= NULL
;
821 tape
->last_stage
= new_last_stage
;
822 tape
->next_stage
= NULL
;
826 * Finish servicing a request and insert a pending pipeline request into the
829 static int idetape_end_request(ide_drive_t
*drive
, int uptodate
, int nr_sects
)
831 struct request
*rq
= HWGROUP(drive
)->rq
;
832 idetape_tape_t
*tape
= drive
->driver_data
;
835 int remove_stage
= 0;
836 idetape_stage_t
*active_stage
;
838 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
841 case 0: error
= IDETAPE_ERROR_GENERAL
; break;
842 case 1: error
= 0; break;
843 default: error
= uptodate
;
847 tape
->failed_pc
= NULL
;
849 if (!blk_special_request(rq
)) {
850 ide_end_request(drive
, uptodate
, nr_sects
);
854 spin_lock_irqsave(&tape
->lock
, flags
);
856 /* The request was a pipelined data transfer request */
857 if (tape
->active_data_rq
== rq
) {
858 active_stage
= tape
->active_stage
;
859 tape
->active_stage
= NULL
;
860 tape
->active_data_rq
= NULL
;
861 tape
->nr_pending_stages
--;
862 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
865 set_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
866 if (error
== IDETAPE_ERROR_EOD
)
867 idetape_abort_pipeline(drive
,
870 } else if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
871 if (error
== IDETAPE_ERROR_EOD
) {
872 set_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
873 idetape_abort_pipeline(drive
, active_stage
);
876 if (tape
->next_stage
!= NULL
) {
877 idetape_activate_next_stage(drive
);
879 /* Insert the next request into the request queue. */
880 (void)ide_do_drive_cmd(drive
, tape
->active_data_rq
,
884 * This is a part of the feedback loop which tries to
885 * find the optimum number of stages. We are starting
886 * from a minimum maximum number of stages, and if we
887 * sense that the pipeline is empty, we try to increase
888 * it, until we reach the user compile time memory
891 int i
= (tape
->max_pipeline
- tape
->min_pipeline
) / 10;
893 tape
->max_stages
+= max(i
, 1);
894 tape
->max_stages
= max(tape
->max_stages
,
896 tape
->max_stages
= min(tape
->max_stages
,
900 ide_end_drive_cmd(drive
, 0, 0);
903 idetape_remove_stage_head(drive
);
904 if (tape
->active_data_rq
== NULL
)
905 clear_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
906 spin_unlock_irqrestore(&tape
->lock
, flags
);
910 static ide_startstop_t
idetape_request_sense_callback(ide_drive_t
*drive
)
912 idetape_tape_t
*tape
= drive
->driver_data
;
914 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
916 if (!tape
->pc
->error
) {
917 idetape_analyze_error(drive
, tape
->pc
->buffer
);
918 idetape_end_request(drive
, 1, 0);
920 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE itself - "
921 "Aborting request!\n");
922 idetape_end_request(drive
, 0, 0);
927 static void idetape_create_request_sense_cmd(idetape_pc_t
*pc
)
930 pc
->c
[0] = REQUEST_SENSE
;
932 pc
->request_transfer
= 20;
933 pc
->callback
= &idetape_request_sense_callback
;
936 static void idetape_init_rq(struct request
*rq
, u8 cmd
)
938 memset(rq
, 0, sizeof(*rq
));
939 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
944 * Generate a new packet command request in front of the request queue, before
945 * the current request, so that it will be processed immediately, on the next
946 * pass through the driver. The function below is called from the request
947 * handling part of the driver (the "bottom" part). Safe storage for the request
948 * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that.
950 * Memory for those requests is pre-allocated at initialization time, and is
951 * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for
952 * the maximum possible number of inter-dependent packet commands.
954 * The higher level of the driver - The ioctl handler and the character device
955 * handling functions should queue request to the lower level part and wait for
956 * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail.
958 static void idetape_queue_pc_head(ide_drive_t
*drive
, idetape_pc_t
*pc
,
961 struct ide_tape_obj
*tape
= drive
->driver_data
;
963 idetape_init_rq(rq
, REQ_IDETAPE_PC1
);
964 rq
->buffer
= (char *) pc
;
965 rq
->rq_disk
= tape
->disk
;
966 (void) ide_do_drive_cmd(drive
, rq
, ide_preempt
);
970 * idetape_retry_pc is called when an error was detected during the
971 * last packet command. We queue a request sense packet command in
972 * the head of the request list.
974 static ide_startstop_t
idetape_retry_pc (ide_drive_t
*drive
)
976 idetape_tape_t
*tape
= drive
->driver_data
;
980 (void)ide_read_error(drive
);
981 pc
= idetape_next_pc_storage(drive
);
982 rq
= idetape_next_rq_storage(drive
);
983 idetape_create_request_sense_cmd(pc
);
984 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
985 idetape_queue_pc_head(drive
, pc
, rq
);
990 * Postpone the current request so that ide.c will be able to service requests
991 * from another device on the same hwgroup while we are polling for DSC.
993 static void idetape_postpone_request(ide_drive_t
*drive
)
995 idetape_tape_t
*tape
= drive
->driver_data
;
997 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
999 tape
->postponed_rq
= HWGROUP(drive
)->rq
;
1000 ide_stall_queue(drive
, tape
->dsc_poll_freq
);
1003 typedef void idetape_io_buf(ide_drive_t
*, idetape_pc_t
*, unsigned int);
1006 * This is the usual interrupt handler which will be called during a packet
1007 * command. We will transfer some of the data (as requested by the drive) and
1008 * will re-point interrupt handler to us. When data transfer is finished, we
1009 * will act according to the algorithm described before
1012 static ide_startstop_t
idetape_pc_intr(ide_drive_t
*drive
)
1014 ide_hwif_t
*hwif
= drive
->hwif
;
1015 idetape_tape_t
*tape
= drive
->driver_data
;
1016 idetape_pc_t
*pc
= tape
->pc
;
1017 xfer_func_t
*xferfunc
;
1018 idetape_io_buf
*iobuf
;
1021 static int error_sim_count
;
1026 debug_log(DBG_PROCS
, "Enter %s - interrupt handler\n", __func__
);
1028 /* Clear the interrupt */
1029 stat
= ide_read_status(drive
);
1031 if (test_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
)) {
1032 if (hwif
->ide_dma_end(drive
) || (stat
& ERR_STAT
)) {
1034 * A DMA error is sometimes expected. For example,
1035 * if the tape is crossing a filemark during a
1036 * READ command, it will issue an irq and position
1037 * itself before the filemark, so that only a partial
1038 * data transfer will occur (which causes the DMA
1039 * error). In that case, we will later ask the tape
1040 * how much bytes of the original request were
1041 * actually transferred (we can't receive that
1042 * information from the DMA engine on most chipsets).
1046 * On the contrary, a DMA error is never expected;
1047 * it usually indicates a hardware error or abort.
1048 * If the tape crosses a filemark during a READ
1049 * command, it will issue an irq and position itself
1050 * after the filemark (not before). Only a partial
1051 * data transfer will occur, but no DMA error.
1054 set_bit(PC_DMA_ERROR
, &pc
->flags
);
1056 pc
->actually_transferred
= pc
->request_transfer
;
1057 idetape_update_buffers(pc
);
1059 debug_log(DBG_PROCS
, "DMA finished\n");
1063 /* No more interrupts */
1064 if ((stat
& DRQ_STAT
) == 0) {
1065 debug_log(DBG_SENSE
, "Packet command completed, %d bytes"
1066 " transferred\n", pc
->actually_transferred
);
1068 clear_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
);
1072 if ((pc
->c
[0] == WRITE_6
|| pc
->c
[0] == READ_6
) &&
1073 (++error_sim_count
% 100) == 0) {
1074 printk(KERN_INFO
"ide-tape: %s: simulating error\n",
1079 if ((stat
& ERR_STAT
) && pc
->c
[0] == REQUEST_SENSE
)
1081 if ((stat
& ERR_STAT
) || test_bit(PC_DMA_ERROR
, &pc
->flags
)) {
1082 /* Error detected */
1083 debug_log(DBG_ERR
, "%s: I/O error\n", tape
->name
);
1085 if (pc
->c
[0] == REQUEST_SENSE
) {
1086 printk(KERN_ERR
"ide-tape: I/O error in request"
1087 " sense command\n");
1088 return ide_do_reset(drive
);
1090 debug_log(DBG_ERR
, "[cmd %x]: check condition\n",
1093 /* Retry operation */
1094 return idetape_retry_pc(drive
);
1097 if (test_bit(PC_WAIT_FOR_DSC
, &pc
->flags
) &&
1098 (stat
& SEEK_STAT
) == 0) {
1099 /* Media access command */
1100 tape
->dsc_polling_start
= jiffies
;
1101 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_FAST
;
1102 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
1103 /* Allow ide.c to handle other requests */
1104 idetape_postpone_request(drive
);
1107 if (tape
->failed_pc
== pc
)
1108 tape
->failed_pc
= NULL
;
1109 /* Command finished - Call the callback function */
1110 return pc
->callback(drive
);
1112 if (test_and_clear_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
)) {
1113 printk(KERN_ERR
"ide-tape: The tape wants to issue more "
1114 "interrupts in DMA mode\n");
1115 printk(KERN_ERR
"ide-tape: DMA disabled, reverting to PIO\n");
1117 return ide_do_reset(drive
);
1119 /* Get the number of bytes to transfer on this interrupt. */
1120 bcount
= (hwif
->INB(hwif
->io_ports
[IDE_BCOUNTH_OFFSET
]) << 8) |
1121 hwif
->INB(hwif
->io_ports
[IDE_BCOUNTL_OFFSET
]);
1123 ireason
= hwif
->INB(hwif
->io_ports
[IDE_IREASON_OFFSET
]);
1126 printk(KERN_ERR
"ide-tape: CoD != 0 in %s\n", __func__
);
1127 return ide_do_reset(drive
);
1129 if (((ireason
& IO
) == IO
) == test_bit(PC_WRITING
, &pc
->flags
)) {
1130 /* Hopefully, we will never get here */
1131 printk(KERN_ERR
"ide-tape: We wanted to %s, ",
1132 (ireason
& IO
) ? "Write" : "Read");
1133 printk(KERN_ERR
"ide-tape: but the tape wants us to %s !\n",
1134 (ireason
& IO
) ? "Read" : "Write");
1135 return ide_do_reset(drive
);
1137 if (!test_bit(PC_WRITING
, &pc
->flags
)) {
1138 /* Reading - Check that we have enough space */
1139 temp
= pc
->actually_transferred
+ bcount
;
1140 if (temp
> pc
->request_transfer
) {
1141 if (temp
> pc
->buffer_size
) {
1142 printk(KERN_ERR
"ide-tape: The tape wants to "
1143 "send us more data than expected "
1144 "- discarding data\n");
1145 ide_atapi_discard_data(drive
, bcount
);
1146 ide_set_handler(drive
, &idetape_pc_intr
,
1147 IDETAPE_WAIT_CMD
, NULL
);
1150 debug_log(DBG_SENSE
, "The tape wants to send us more "
1151 "data than expected - allowing transfer\n");
1153 iobuf
= &idetape_input_buffers
;
1154 xferfunc
= hwif
->atapi_input_bytes
;
1156 iobuf
= &idetape_output_buffers
;
1157 xferfunc
= hwif
->atapi_output_bytes
;
1161 iobuf(drive
, pc
, bcount
);
1163 xferfunc(drive
, pc
->current_position
, bcount
);
1165 /* Update the current position */
1166 pc
->actually_transferred
+= bcount
;
1167 pc
->current_position
+= bcount
;
1169 debug_log(DBG_SENSE
, "[cmd %x] transferred %d bytes on that intr.\n",
1172 /* And set the interrupt handler again */
1173 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1178 * Packet Command Interface
1180 * The current Packet Command is available in tape->pc, and will not change
1181 * until we finish handling it. Each packet command is associated with a
1182 * callback function that will be called when the command is finished.
1184 * The handling will be done in three stages:
1186 * 1. idetape_issue_pc will send the packet command to the drive, and will set
1187 * the interrupt handler to idetape_pc_intr.
1189 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
1190 * repeated until the device signals us that no more interrupts will be issued.
1192 * 3. ATAPI Tape media access commands have immediate status with a delayed
1193 * process. In case of a successful initiation of a media access packet command,
1194 * the DSC bit will be set when the actual execution of the command is finished.
1195 * Since the tape drive will not issue an interrupt, we have to poll for this
1196 * event. In this case, we define the request as "low priority request" by
1197 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
1200 * ide.c will then give higher priority to requests which originate from the
1201 * other device, until will change rq_status to RQ_ACTIVE.
1203 * 4. When the packet command is finished, it will be checked for errors.
1205 * 5. In case an error was found, we queue a request sense packet command in
1206 * front of the request queue and retry the operation up to
1207 * IDETAPE_MAX_PC_RETRIES times.
1209 * 6. In case no error was found, or we decided to give up and not to retry
1210 * again, the callback function will be called and then we will handle the next
1213 static ide_startstop_t
idetape_transfer_pc(ide_drive_t
*drive
)
1215 ide_hwif_t
*hwif
= drive
->hwif
;
1216 idetape_tape_t
*tape
= drive
->driver_data
;
1217 idetape_pc_t
*pc
= tape
->pc
;
1219 ide_startstop_t startstop
;
1222 if (ide_wait_stat(&startstop
, drive
, DRQ_STAT
, BUSY_STAT
, WAIT_READY
)) {
1223 printk(KERN_ERR
"ide-tape: Strange, packet command initiated "
1224 "yet DRQ isn't asserted\n");
1227 ireason
= hwif
->INB(hwif
->io_ports
[IDE_IREASON_OFFSET
]);
1228 while (retries
-- && ((ireason
& CD
) == 0 || (ireason
& IO
))) {
1229 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while issuing "
1230 "a packet command, retrying\n");
1232 ireason
= hwif
->INB(hwif
->io_ports
[IDE_IREASON_OFFSET
]);
1234 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while "
1235 "issuing a packet command, ignoring\n");
1240 if ((ireason
& CD
) == 0 || (ireason
& IO
)) {
1241 printk(KERN_ERR
"ide-tape: (IO,CoD) != (0,1) while issuing "
1242 "a packet command\n");
1243 return ide_do_reset(drive
);
1245 /* Set the interrupt routine */
1246 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1247 #ifdef CONFIG_BLK_DEV_IDEDMA
1248 /* Begin DMA, if necessary */
1249 if (test_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
))
1250 hwif
->dma_start(drive
);
1252 /* Send the actual packet */
1253 HWIF(drive
)->atapi_output_bytes(drive
, pc
->c
, 12);
1257 static ide_startstop_t
idetape_issue_pc(ide_drive_t
*drive
, idetape_pc_t
*pc
)
1259 ide_hwif_t
*hwif
= drive
->hwif
;
1260 idetape_tape_t
*tape
= drive
->driver_data
;
1264 if (tape
->pc
->c
[0] == REQUEST_SENSE
&&
1265 pc
->c
[0] == REQUEST_SENSE
) {
1266 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
1267 "Two request sense in serial were issued\n");
1270 if (tape
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
1271 tape
->failed_pc
= pc
;
1272 /* Set the current packet command */
1275 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
1276 test_bit(PC_ABORT
, &pc
->flags
)) {
1278 * We will "abort" retrying a packet command in case legitimate
1279 * error code was received (crossing a filemark, or end of the
1280 * media, for example).
1282 if (!test_bit(PC_ABORT
, &pc
->flags
)) {
1283 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
1284 tape
->sense_key
== 2 && tape
->asc
== 4 &&
1285 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
1286 printk(KERN_ERR
"ide-tape: %s: I/O error, "
1287 "pc = %2x, key = %2x, "
1288 "asc = %2x, ascq = %2x\n",
1289 tape
->name
, pc
->c
[0],
1290 tape
->sense_key
, tape
->asc
,
1294 pc
->error
= IDETAPE_ERROR_GENERAL
;
1296 tape
->failed_pc
= NULL
;
1297 return pc
->callback(drive
);
1299 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
1302 /* We haven't transferred any data yet */
1303 pc
->actually_transferred
= 0;
1304 pc
->current_position
= pc
->buffer
;
1305 /* Request to transfer the entire buffer at once */
1306 bcount
= pc
->request_transfer
;
1308 if (test_and_clear_bit(PC_DMA_ERROR
, &pc
->flags
)) {
1309 printk(KERN_WARNING
"ide-tape: DMA disabled, "
1310 "reverting to PIO\n");
1313 if (test_bit(PC_DMA_RECOMMENDED
, &pc
->flags
) && drive
->using_dma
)
1314 dma_ok
= !hwif
->dma_setup(drive
);
1316 ide_pktcmd_tf_load(drive
, IDE_TFLAG_NO_SELECT_MASK
|
1317 IDE_TFLAG_OUT_DEVICE
, bcount
, dma_ok
);
1319 if (dma_ok
) /* Will begin DMA later */
1320 set_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
);
1321 if (test_bit(IDETAPE_DRQ_INTERRUPT
, &tape
->flags
)) {
1322 ide_execute_command(drive
, WIN_PACKETCMD
, &idetape_transfer_pc
,
1323 IDETAPE_WAIT_CMD
, NULL
);
1326 hwif
->OUTB(WIN_PACKETCMD
, hwif
->io_ports
[IDE_COMMAND_OFFSET
]);
1327 return idetape_transfer_pc(drive
);
1331 static ide_startstop_t
idetape_pc_callback(ide_drive_t
*drive
)
1333 idetape_tape_t
*tape
= drive
->driver_data
;
1335 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1337 idetape_end_request(drive
, tape
->pc
->error
? 0 : 1, 0);
1341 /* A mode sense command is used to "sense" tape parameters. */
1342 static void idetape_create_mode_sense_cmd(idetape_pc_t
*pc
, u8 page_code
)
1344 idetape_init_pc(pc
);
1345 pc
->c
[0] = MODE_SENSE
;
1346 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
1347 /* DBD = 1 - Don't return block descriptors */
1349 pc
->c
[2] = page_code
;
1351 * Changed pc->c[3] to 0 (255 will at best return unused info).
1353 * For SCSI this byte is defined as subpage instead of high byte
1354 * of length and some IDE drives seem to interpret it this way
1355 * and return an error when 255 is used.
1358 /* We will just discard data in that case */
1360 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
1361 pc
->request_transfer
= 12;
1362 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
1363 pc
->request_transfer
= 24;
1365 pc
->request_transfer
= 50;
1366 pc
->callback
= &idetape_pc_callback
;
1369 static void idetape_calculate_speeds(ide_drive_t
*drive
)
1371 idetape_tape_t
*tape
= drive
->driver_data
;
1373 if (time_after(jiffies
,
1374 tape
->controlled_pipeline_head_time
+ 120 * HZ
)) {
1375 tape
->controlled_previous_pipeline_head
=
1376 tape
->controlled_last_pipeline_head
;
1377 tape
->controlled_previous_head_time
=
1378 tape
->controlled_pipeline_head_time
;
1379 tape
->controlled_last_pipeline_head
= tape
->pipeline_head
;
1380 tape
->controlled_pipeline_head_time
= jiffies
;
1382 if (time_after(jiffies
, tape
->controlled_pipeline_head_time
+ 60 * HZ
))
1383 tape
->controlled_pipeline_head_speed
= (tape
->pipeline_head
-
1384 tape
->controlled_last_pipeline_head
) * 32 * HZ
/
1385 (jiffies
- tape
->controlled_pipeline_head_time
);
1386 else if (time_after(jiffies
, tape
->controlled_previous_head_time
))
1387 tape
->controlled_pipeline_head_speed
= (tape
->pipeline_head
-
1388 tape
->controlled_previous_pipeline_head
) * 32 *
1389 HZ
/ (jiffies
- tape
->controlled_previous_head_time
);
1391 if (tape
->nr_pending_stages
< tape
->max_stages
/*- 1 */) {
1392 /* -1 for read mode error recovery */
1393 if (time_after(jiffies
, tape
->uncontrolled_previous_head_time
+
1395 tape
->uncontrolled_pipeline_head_time
= jiffies
;
1396 tape
->uncontrolled_pipeline_head_speed
=
1397 (tape
->pipeline_head
-
1398 tape
->uncontrolled_previous_pipeline_head
) *
1399 32 * HZ
/ (jiffies
-
1400 tape
->uncontrolled_previous_head_time
);
1403 tape
->uncontrolled_previous_head_time
= jiffies
;
1404 tape
->uncontrolled_previous_pipeline_head
= tape
->pipeline_head
;
1405 if (time_after(jiffies
, tape
->uncontrolled_pipeline_head_time
+
1407 tape
->uncontrolled_pipeline_head_time
= jiffies
;
1410 tape
->pipeline_head_speed
= max(tape
->uncontrolled_pipeline_head_speed
,
1411 tape
->controlled_pipeline_head_speed
);
1413 if (tape
->speed_control
== 1) {
1414 if (tape
->nr_pending_stages
>= tape
->max_stages
/ 2)
1415 tape
->max_insert_speed
= tape
->pipeline_head_speed
+
1416 (1100 - tape
->pipeline_head_speed
) * 2 *
1417 (tape
->nr_pending_stages
- tape
->max_stages
/ 2)
1420 tape
->max_insert_speed
= 500 +
1421 (tape
->pipeline_head_speed
- 500) * 2 *
1422 tape
->nr_pending_stages
/ tape
->max_stages
;
1424 if (tape
->nr_pending_stages
>= tape
->max_stages
* 99 / 100)
1425 tape
->max_insert_speed
= 5000;
1427 tape
->max_insert_speed
= tape
->speed_control
;
1429 tape
->max_insert_speed
= max(tape
->max_insert_speed
, 500);
1432 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
1434 idetape_tape_t
*tape
= drive
->driver_data
;
1435 idetape_pc_t
*pc
= tape
->pc
;
1438 stat
= ide_read_status(drive
);
1440 if (stat
& SEEK_STAT
) {
1441 if (stat
& ERR_STAT
) {
1442 /* Error detected */
1443 if (pc
->c
[0] != TEST_UNIT_READY
)
1444 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
1446 /* Retry operation */
1447 return idetape_retry_pc(drive
);
1450 if (tape
->failed_pc
== pc
)
1451 tape
->failed_pc
= NULL
;
1453 pc
->error
= IDETAPE_ERROR_GENERAL
;
1454 tape
->failed_pc
= NULL
;
1456 return pc
->callback(drive
);
1459 static ide_startstop_t
idetape_rw_callback(ide_drive_t
*drive
)
1461 idetape_tape_t
*tape
= drive
->driver_data
;
1462 struct request
*rq
= HWGROUP(drive
)->rq
;
1463 int blocks
= tape
->pc
->actually_transferred
/ tape
->blk_size
;
1465 tape
->avg_size
+= blocks
* tape
->blk_size
;
1466 tape
->insert_size
+= blocks
* tape
->blk_size
;
1467 if (tape
->insert_size
> 1024 * 1024)
1468 tape
->measure_insert_time
= 1;
1469 if (tape
->measure_insert_time
) {
1470 tape
->measure_insert_time
= 0;
1471 tape
->insert_time
= jiffies
;
1472 tape
->insert_size
= 0;
1474 if (time_after(jiffies
, tape
->insert_time
))
1475 tape
->insert_speed
= tape
->insert_size
/ 1024 * HZ
/
1476 (jiffies
- tape
->insert_time
);
1477 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
1478 tape
->avg_speed
= tape
->avg_size
* HZ
/
1479 (jiffies
- tape
->avg_time
) / 1024;
1481 tape
->avg_time
= jiffies
;
1483 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1485 tape
->first_frame
+= blocks
;
1486 rq
->current_nr_sectors
-= blocks
;
1488 if (!tape
->pc
->error
)
1489 idetape_end_request(drive
, 1, 0);
1491 idetape_end_request(drive
, tape
->pc
->error
, 0);
1495 static void idetape_create_read_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
,
1496 unsigned int length
, struct idetape_bh
*bh
)
1498 idetape_init_pc(pc
);
1500 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1502 pc
->callback
= &idetape_rw_callback
;
1504 atomic_set(&bh
->b_count
, 0);
1506 pc
->buffer_size
= length
* tape
->blk_size
;
1507 pc
->request_transfer
= pc
->buffer_size
;
1508 if (pc
->request_transfer
== tape
->stage_size
)
1509 set_bit(PC_DMA_RECOMMENDED
, &pc
->flags
);
1512 static void idetape_create_write_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
,
1513 unsigned int length
, struct idetape_bh
*bh
)
1515 idetape_init_pc(pc
);
1517 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1519 pc
->callback
= &idetape_rw_callback
;
1520 set_bit(PC_WRITING
, &pc
->flags
);
1522 pc
->b_data
= bh
->b_data
;
1523 pc
->b_count
= atomic_read(&bh
->b_count
);
1525 pc
->buffer_size
= length
* tape
->blk_size
;
1526 pc
->request_transfer
= pc
->buffer_size
;
1527 if (pc
->request_transfer
== tape
->stage_size
)
1528 set_bit(PC_DMA_RECOMMENDED
, &pc
->flags
);
1531 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
1532 struct request
*rq
, sector_t block
)
1534 idetape_tape_t
*tape
= drive
->driver_data
;
1535 idetape_pc_t
*pc
= NULL
;
1536 struct request
*postponed_rq
= tape
->postponed_rq
;
1539 debug_log(DBG_SENSE
, "sector: %ld, nr_sectors: %ld,"
1540 " current_nr_sectors: %d\n",
1541 rq
->sector
, rq
->nr_sectors
, rq
->current_nr_sectors
);
1543 if (!blk_special_request(rq
)) {
1544 /* We do not support buffer cache originated requests. */
1545 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
1546 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
1547 ide_end_request(drive
, 0, 0);
1551 /* Retry a failed packet command */
1552 if (tape
->failed_pc
&& tape
->pc
->c
[0] == REQUEST_SENSE
)
1553 return idetape_issue_pc(drive
, tape
->failed_pc
);
1555 if (postponed_rq
!= NULL
)
1556 if (rq
!= postponed_rq
) {
1557 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
1558 "Two DSC requests were queued\n");
1559 idetape_end_request(drive
, 0, 0);
1563 tape
->postponed_rq
= NULL
;
1566 * If the tape is still busy, postpone our request and service
1567 * the other device meanwhile.
1569 stat
= ide_read_status(drive
);
1571 if (!drive
->dsc_overlap
&& !(rq
->cmd
[0] & REQ_IDETAPE_PC2
))
1572 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
1574 if (drive
->post_reset
== 1) {
1575 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
1576 drive
->post_reset
= 0;
1579 if (time_after(jiffies
, tape
->insert_time
))
1580 tape
->insert_speed
= tape
->insert_size
/ 1024 * HZ
/
1581 (jiffies
- tape
->insert_time
);
1582 idetape_calculate_speeds(drive
);
1583 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
) &&
1584 (stat
& SEEK_STAT
) == 0) {
1585 if (postponed_rq
== NULL
) {
1586 tape
->dsc_polling_start
= jiffies
;
1587 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
1588 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
1589 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
1590 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
1592 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1593 idetape_media_access_finished(drive
);
1596 return ide_do_reset(drive
);
1598 } else if (time_after(jiffies
,
1599 tape
->dsc_polling_start
+
1600 IDETAPE_DSC_MA_THRESHOLD
))
1601 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
1602 idetape_postpone_request(drive
);
1605 if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1606 tape
->buffer_head
++;
1607 tape
->postpone_cnt
= 0;
1608 pc
= idetape_next_pc_storage(drive
);
1609 idetape_create_read_cmd(tape
, pc
, rq
->current_nr_sectors
,
1610 (struct idetape_bh
*)rq
->special
);
1613 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1614 tape
->buffer_head
++;
1615 tape
->postpone_cnt
= 0;
1616 pc
= idetape_next_pc_storage(drive
);
1617 idetape_create_write_cmd(tape
, pc
, rq
->current_nr_sectors
,
1618 (struct idetape_bh
*)rq
->special
);
1621 if (rq
->cmd
[0] & REQ_IDETAPE_PC1
) {
1622 pc
= (idetape_pc_t
*) rq
->buffer
;
1623 rq
->cmd
[0] &= ~(REQ_IDETAPE_PC1
);
1624 rq
->cmd
[0] |= REQ_IDETAPE_PC2
;
1627 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1628 idetape_media_access_finished(drive
);
1633 return idetape_issue_pc(drive
, pc
);
1636 /* Pipeline related functions */
1637 static inline int idetape_pipeline_active(idetape_tape_t
*tape
)
1641 rc1
= test_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
1642 rc2
= (tape
->active_data_rq
!= NULL
);
1647 * The function below uses __get_free_page to allocate a pipeline stage, along
1648 * with all the necessary small buffers which together make a buffer of size
1649 * tape->stage_size (or a bit more). We attempt to combine sequential pages as
1652 * It returns a pointer to the new allocated stage, or NULL if we can't (or
1653 * don't want to) allocate a stage.
1655 * Pipeline stages are optional and are used to increase performance. If we
1656 * can't allocate them, we'll manage without them.
1658 static idetape_stage_t
*__idetape_kmalloc_stage(idetape_tape_t
*tape
, int full
,
1661 idetape_stage_t
*stage
;
1662 struct idetape_bh
*prev_bh
, *bh
;
1663 int pages
= tape
->pages_per_stage
;
1664 char *b_data
= NULL
;
1666 stage
= kmalloc(sizeof(idetape_stage_t
), GFP_KERNEL
);
1671 stage
->bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1675 bh
->b_reqnext
= NULL
;
1676 bh
->b_data
= (char *) __get_free_page(GFP_KERNEL
);
1680 memset(bh
->b_data
, 0, PAGE_SIZE
);
1681 bh
->b_size
= PAGE_SIZE
;
1682 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1685 b_data
= (char *) __get_free_page(GFP_KERNEL
);
1689 memset(b_data
, 0, PAGE_SIZE
);
1690 if (bh
->b_data
== b_data
+ PAGE_SIZE
) {
1691 bh
->b_size
+= PAGE_SIZE
;
1692 bh
->b_data
-= PAGE_SIZE
;
1694 atomic_add(PAGE_SIZE
, &bh
->b_count
);
1697 if (b_data
== bh
->b_data
+ bh
->b_size
) {
1698 bh
->b_size
+= PAGE_SIZE
;
1700 atomic_add(PAGE_SIZE
, &bh
->b_count
);
1704 bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1706 free_page((unsigned long) b_data
);
1709 bh
->b_reqnext
= NULL
;
1710 bh
->b_data
= b_data
;
1711 bh
->b_size
= PAGE_SIZE
;
1712 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1713 prev_bh
->b_reqnext
= bh
;
1715 bh
->b_size
-= tape
->excess_bh_size
;
1717 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
1720 __idetape_kfree_stage(stage
);
1724 static idetape_stage_t
*idetape_kmalloc_stage(idetape_tape_t
*tape
)
1726 idetape_stage_t
*cache_stage
= tape
->cache_stage
;
1728 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1730 if (tape
->nr_stages
>= tape
->max_stages
)
1732 if (cache_stage
!= NULL
) {
1733 tape
->cache_stage
= NULL
;
1736 return __idetape_kmalloc_stage(tape
, 0, 0);
1739 static int idetape_copy_stage_from_user(idetape_tape_t
*tape
,
1740 idetape_stage_t
*stage
, const char __user
*buf
, int n
)
1742 struct idetape_bh
*bh
= tape
->bh
;
1748 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1752 count
= min((unsigned int)
1753 (bh
->b_size
- atomic_read(&bh
->b_count
)),
1755 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
,
1759 atomic_add(count
, &bh
->b_count
);
1761 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
1764 atomic_set(&bh
->b_count
, 0);
1771 static int idetape_copy_stage_to_user(idetape_tape_t
*tape
, char __user
*buf
,
1772 idetape_stage_t
*stage
, int n
)
1774 struct idetape_bh
*bh
= tape
->bh
;
1780 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1784 count
= min(tape
->b_count
, n
);
1785 if (copy_to_user(buf
, tape
->b_data
, count
))
1788 tape
->b_data
+= count
;
1789 tape
->b_count
-= count
;
1791 if (!tape
->b_count
) {
1795 tape
->b_data
= bh
->b_data
;
1796 tape
->b_count
= atomic_read(&bh
->b_count
);
1803 static void idetape_init_merge_stage(idetape_tape_t
*tape
)
1805 struct idetape_bh
*bh
= tape
->merge_stage
->bh
;
1808 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1809 atomic_set(&bh
->b_count
, 0);
1811 tape
->b_data
= bh
->b_data
;
1812 tape
->b_count
= atomic_read(&bh
->b_count
);
1816 static void idetape_switch_buffers(idetape_tape_t
*tape
, idetape_stage_t
*stage
)
1818 struct idetape_bh
*tmp
;
1821 stage
->bh
= tape
->merge_stage
->bh
;
1822 tape
->merge_stage
->bh
= tmp
;
1823 idetape_init_merge_stage(tape
);
1826 /* Add a new stage at the end of the pipeline. */
1827 static void idetape_add_stage_tail(ide_drive_t
*drive
, idetape_stage_t
*stage
)
1829 idetape_tape_t
*tape
= drive
->driver_data
;
1830 unsigned long flags
;
1832 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1834 spin_lock_irqsave(&tape
->lock
, flags
);
1836 if (tape
->last_stage
!= NULL
)
1837 tape
->last_stage
->next
= stage
;
1839 tape
->first_stage
= stage
;
1840 tape
->next_stage
= stage
;
1841 tape
->last_stage
= stage
;
1842 if (tape
->next_stage
== NULL
)
1843 tape
->next_stage
= tape
->last_stage
;
1845 tape
->nr_pending_stages
++;
1846 spin_unlock_irqrestore(&tape
->lock
, flags
);
1849 /* Install a completion in a pending request and sleep until it is serviced. The
1850 * caller should ensure that the request will not be serviced before we install
1851 * the completion (usually by disabling interrupts).
1853 static void idetape_wait_for_request(ide_drive_t
*drive
, struct request
*rq
)
1855 DECLARE_COMPLETION_ONSTACK(wait
);
1856 idetape_tape_t
*tape
= drive
->driver_data
;
1858 if (rq
== NULL
|| !blk_special_request(rq
)) {
1859 printk(KERN_ERR
"ide-tape: bug: Trying to sleep on non-valid"
1863 rq
->end_io_data
= &wait
;
1864 rq
->end_io
= blk_end_sync_rq
;
1865 spin_unlock_irq(&tape
->lock
);
1866 wait_for_completion(&wait
);
1867 /* The stage and its struct request have been deallocated */
1868 spin_lock_irq(&tape
->lock
);
1871 static ide_startstop_t
idetape_read_position_callback(ide_drive_t
*drive
)
1873 idetape_tape_t
*tape
= drive
->driver_data
;
1874 u8
*readpos
= tape
->pc
->buffer
;
1876 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1878 if (!tape
->pc
->error
) {
1879 debug_log(DBG_SENSE
, "BOP - %s\n",
1880 (readpos
[0] & 0x80) ? "Yes" : "No");
1881 debug_log(DBG_SENSE
, "EOP - %s\n",
1882 (readpos
[0] & 0x40) ? "Yes" : "No");
1884 if (readpos
[0] & 0x4) {
1885 printk(KERN_INFO
"ide-tape: Block location is unknown"
1887 clear_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
);
1888 idetape_end_request(drive
, 0, 0);
1890 debug_log(DBG_SENSE
, "Block Location - %u\n",
1891 be32_to_cpu(*(u32
*)&readpos
[4]));
1893 tape
->partition
= readpos
[1];
1895 be32_to_cpu(*(u32
*)&readpos
[4]);
1896 set_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
);
1897 idetape_end_request(drive
, 1, 0);
1900 idetape_end_request(drive
, 0, 0);
1906 * Write a filemark if write_filemark=1. Flush the device buffers without
1907 * writing a filemark otherwise.
1909 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
1910 idetape_pc_t
*pc
, int write_filemark
)
1912 idetape_init_pc(pc
);
1913 pc
->c
[0] = WRITE_FILEMARKS
;
1914 pc
->c
[4] = write_filemark
;
1915 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
1916 pc
->callback
= &idetape_pc_callback
;
1919 static void idetape_create_test_unit_ready_cmd(idetape_pc_t
*pc
)
1921 idetape_init_pc(pc
);
1922 pc
->c
[0] = TEST_UNIT_READY
;
1923 pc
->callback
= &idetape_pc_callback
;
1927 * We add a special packet command request to the tail of the request queue, and
1928 * wait for it to be serviced. This is not to be called from within the request
1929 * handling part of the driver! We allocate here data on the stack and it is
1930 * valid until the request is finished. This is not the case for the bottom part
1931 * of the driver, where we are always leaving the functions to wait for an
1932 * interrupt or a timer event.
1934 * From the bottom part of the driver, we should allocate safe memory using
1935 * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request
1936 * to the request list without waiting for it to be serviced! In that case, we
1937 * usually use idetape_queue_pc_head().
1939 static int __idetape_queue_pc_tail(ide_drive_t
*drive
, idetape_pc_t
*pc
)
1941 struct ide_tape_obj
*tape
= drive
->driver_data
;
1944 idetape_init_rq(&rq
, REQ_IDETAPE_PC1
);
1945 rq
.buffer
= (char *) pc
;
1946 rq
.rq_disk
= tape
->disk
;
1947 return ide_do_drive_cmd(drive
, &rq
, ide_wait
);
1950 static void idetape_create_load_unload_cmd(ide_drive_t
*drive
, idetape_pc_t
*pc
,
1953 idetape_init_pc(pc
);
1954 pc
->c
[0] = START_STOP
;
1956 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
1957 pc
->callback
= &idetape_pc_callback
;
1960 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
1962 idetape_tape_t
*tape
= drive
->driver_data
;
1964 int load_attempted
= 0;
1966 /* Wait for the tape to become ready */
1967 set_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
);
1969 while (time_before(jiffies
, timeout
)) {
1970 idetape_create_test_unit_ready_cmd(&pc
);
1971 if (!__idetape_queue_pc_tail(drive
, &pc
))
1973 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
1974 || (tape
->asc
== 0x3A)) {
1978 idetape_create_load_unload_cmd(drive
, &pc
,
1979 IDETAPE_LU_LOAD_MASK
);
1980 __idetape_queue_pc_tail(drive
, &pc
);
1982 /* not about to be ready */
1983 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
1984 (tape
->ascq
== 1 || tape
->ascq
== 8)))
1991 static int idetape_queue_pc_tail(ide_drive_t
*drive
, idetape_pc_t
*pc
)
1993 return __idetape_queue_pc_tail(drive
, pc
);
1996 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
2001 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
2002 rc
= idetape_queue_pc_tail(drive
, &pc
);
2005 idetape_wait_ready(drive
, 60 * 5 * HZ
);
2009 static void idetape_create_read_position_cmd(idetape_pc_t
*pc
)
2011 idetape_init_pc(pc
);
2012 pc
->c
[0] = READ_POSITION
;
2013 pc
->request_transfer
= 20;
2014 pc
->callback
= &idetape_read_position_callback
;
2017 static int idetape_read_position(ide_drive_t
*drive
)
2019 idetape_tape_t
*tape
= drive
->driver_data
;
2023 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
2025 idetape_create_read_position_cmd(&pc
);
2026 if (idetape_queue_pc_tail(drive
, &pc
))
2028 position
= tape
->first_frame
;
2032 static void idetape_create_locate_cmd(ide_drive_t
*drive
, idetape_pc_t
*pc
,
2033 unsigned int block
, u8 partition
, int skip
)
2035 idetape_init_pc(pc
);
2036 pc
->c
[0] = POSITION_TO_ELEMENT
;
2038 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
2039 pc
->c
[8] = partition
;
2040 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2041 pc
->callback
= &idetape_pc_callback
;
2044 static int idetape_create_prevent_cmd(ide_drive_t
*drive
, idetape_pc_t
*pc
,
2047 idetape_tape_t
*tape
= drive
->driver_data
;
2049 /* device supports locking according to capabilities page */
2050 if (!(tape
->caps
[6] & 0x01))
2053 idetape_init_pc(pc
);
2054 pc
->c
[0] = ALLOW_MEDIUM_REMOVAL
;
2056 pc
->callback
= &idetape_pc_callback
;
2060 static int __idetape_discard_read_pipeline(ide_drive_t
*drive
)
2062 idetape_tape_t
*tape
= drive
->driver_data
;
2063 unsigned long flags
;
2066 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
2069 /* Remove merge stage. */
2070 cnt
= tape
->merge_stage_size
/ tape
->blk_size
;
2071 if (test_and_clear_bit(IDETAPE_FILEMARK
, &tape
->flags
))
2072 ++cnt
; /* Filemarks count as 1 sector */
2073 tape
->merge_stage_size
= 0;
2074 if (tape
->merge_stage
!= NULL
) {
2075 __idetape_kfree_stage(tape
->merge_stage
);
2076 tape
->merge_stage
= NULL
;
2079 /* Clear pipeline flags. */
2080 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
2081 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2083 /* Remove pipeline stages. */
2084 if (tape
->first_stage
== NULL
)
2087 spin_lock_irqsave(&tape
->lock
, flags
);
2088 tape
->next_stage
= NULL
;
2089 if (idetape_pipeline_active(tape
))
2090 idetape_wait_for_request(drive
, tape
->active_data_rq
);
2091 spin_unlock_irqrestore(&tape
->lock
, flags
);
2093 while (tape
->first_stage
!= NULL
) {
2094 struct request
*rq_ptr
= &tape
->first_stage
->rq
;
2096 cnt
+= rq_ptr
->nr_sectors
- rq_ptr
->current_nr_sectors
;
2097 if (rq_ptr
->errors
== IDETAPE_ERROR_FILEMARK
)
2099 idetape_remove_stage_head(drive
);
2101 tape
->nr_pending_stages
= 0;
2102 tape
->max_stages
= tape
->min_pipeline
;
2107 * Position the tape to the requested block using the LOCATE packet command.
2108 * A READ POSITION command is then issued to check where we are positioned. Like
2109 * all higher level operations, we queue the commands at the tail of the request
2110 * queue and wait for their completion.
2112 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
2113 u8 partition
, int skip
)
2115 idetape_tape_t
*tape
= drive
->driver_data
;
2119 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
2120 __idetape_discard_read_pipeline(drive
);
2121 idetape_wait_ready(drive
, 60 * 5 * HZ
);
2122 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
2123 retval
= idetape_queue_pc_tail(drive
, &pc
);
2127 idetape_create_read_position_cmd(&pc
);
2128 return (idetape_queue_pc_tail(drive
, &pc
));
2131 static void idetape_discard_read_pipeline(ide_drive_t
*drive
,
2132 int restore_position
)
2134 idetape_tape_t
*tape
= drive
->driver_data
;
2138 cnt
= __idetape_discard_read_pipeline(drive
);
2139 if (restore_position
) {
2140 position
= idetape_read_position(drive
);
2141 seek
= position
> cnt
? position
- cnt
: 0;
2142 if (idetape_position_tape(drive
, seek
, 0, 0)) {
2143 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
2144 " discard_pipeline()\n", tape
->name
);
2151 * Generate a read/write request for the block device interface and wait for it
2154 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
,
2155 struct idetape_bh
*bh
)
2157 idetape_tape_t
*tape
= drive
->driver_data
;
2160 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
2162 if (idetape_pipeline_active(tape
)) {
2163 printk(KERN_ERR
"ide-tape: bug: the pipeline is active in %s\n",
2168 idetape_init_rq(&rq
, cmd
);
2169 rq
.rq_disk
= tape
->disk
;
2170 rq
.special
= (void *)bh
;
2171 rq
.sector
= tape
->first_frame
;
2172 rq
.nr_sectors
= blocks
;
2173 rq
.current_nr_sectors
= blocks
;
2174 (void) ide_do_drive_cmd(drive
, &rq
, ide_wait
);
2176 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
2179 if (tape
->merge_stage
)
2180 idetape_init_merge_stage(tape
);
2181 if (rq
.errors
== IDETAPE_ERROR_GENERAL
)
2183 return (tape
->blk_size
* (blocks
-rq
.current_nr_sectors
));
2186 /* start servicing the pipeline stages, starting from tape->next_stage. */
2187 static void idetape_plug_pipeline(ide_drive_t
*drive
)
2189 idetape_tape_t
*tape
= drive
->driver_data
;
2191 if (tape
->next_stage
== NULL
)
2193 if (!idetape_pipeline_active(tape
)) {
2194 set_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
2195 idetape_activate_next_stage(drive
);
2196 (void) ide_do_drive_cmd(drive
, tape
->active_data_rq
, ide_end
);
2200 static void idetape_create_inquiry_cmd(idetape_pc_t
*pc
)
2202 idetape_init_pc(pc
);
2205 pc
->request_transfer
= 254;
2206 pc
->callback
= &idetape_pc_callback
;
2209 static void idetape_create_rewind_cmd(ide_drive_t
*drive
, idetape_pc_t
*pc
)
2211 idetape_init_pc(pc
);
2212 pc
->c
[0] = REZERO_UNIT
;
2213 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2214 pc
->callback
= &idetape_pc_callback
;
2217 static void idetape_create_erase_cmd(idetape_pc_t
*pc
)
2219 idetape_init_pc(pc
);
2222 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2223 pc
->callback
= &idetape_pc_callback
;
2226 static void idetape_create_space_cmd(idetape_pc_t
*pc
, int count
, u8 cmd
)
2228 idetape_init_pc(pc
);
2230 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
2232 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2233 pc
->callback
= &idetape_pc_callback
;
2236 static void idetape_wait_first_stage(ide_drive_t
*drive
)
2238 idetape_tape_t
*tape
= drive
->driver_data
;
2239 unsigned long flags
;
2241 if (tape
->first_stage
== NULL
)
2243 spin_lock_irqsave(&tape
->lock
, flags
);
2244 if (tape
->active_stage
== tape
->first_stage
)
2245 idetape_wait_for_request(drive
, tape
->active_data_rq
);
2246 spin_unlock_irqrestore(&tape
->lock
, flags
);
2250 * Try to add a character device originated write request to our pipeline. In
2251 * case we don't succeed, we revert to non-pipelined operation mode for this
2252 * request. In order to accomplish that, we
2254 * 1. Try to allocate a new pipeline stage.
2255 * 2. If we can't, wait for more and more requests to be serviced and try again
2257 * 3. If we still can't allocate a stage, fallback to non-pipelined operation
2258 * mode for this request.
2260 static int idetape_add_chrdev_write_request(ide_drive_t
*drive
, int blocks
)
2262 idetape_tape_t
*tape
= drive
->driver_data
;
2263 idetape_stage_t
*new_stage
;
2264 unsigned long flags
;
2267 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2269 /* Attempt to allocate a new stage. Beware possible race conditions. */
2270 while ((new_stage
= idetape_kmalloc_stage(tape
)) == NULL
) {
2271 spin_lock_irqsave(&tape
->lock
, flags
);
2272 if (idetape_pipeline_active(tape
)) {
2273 idetape_wait_for_request(drive
, tape
->active_data_rq
);
2274 spin_unlock_irqrestore(&tape
->lock
, flags
);
2276 spin_unlock_irqrestore(&tape
->lock
, flags
);
2277 idetape_plug_pipeline(drive
);
2278 if (idetape_pipeline_active(tape
))
2281 * The machine is short on memory. Fallback to non-
2282 * pipelined operation mode for this request.
2284 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
2285 blocks
, tape
->merge_stage
->bh
);
2288 rq
= &new_stage
->rq
;
2289 idetape_init_rq(rq
, REQ_IDETAPE_WRITE
);
2290 /* Doesn't actually matter - We always assume sequential access */
2291 rq
->sector
= tape
->first_frame
;
2292 rq
->current_nr_sectors
= blocks
;
2293 rq
->nr_sectors
= blocks
;
2295 idetape_switch_buffers(tape
, new_stage
);
2296 idetape_add_stage_tail(drive
, new_stage
);
2297 tape
->pipeline_head
++;
2298 idetape_calculate_speeds(drive
);
2301 * Estimate whether the tape has stopped writing by checking if our
2302 * write pipeline is currently empty. If we are not writing anymore,
2303 * wait for the pipeline to be almost completely full (90%) before
2304 * starting to service requests, so that we will be able to keep up with
2305 * the higher speeds of the tape.
2307 if (!idetape_pipeline_active(tape
)) {
2308 if (tape
->nr_stages
>= tape
->max_stages
* 9 / 10 ||
2309 tape
->nr_stages
>= tape
->max_stages
-
2310 tape
->uncontrolled_pipeline_head_speed
* 3 * 1024 /
2312 tape
->measure_insert_time
= 1;
2313 tape
->insert_time
= jiffies
;
2314 tape
->insert_size
= 0;
2315 tape
->insert_speed
= 0;
2316 idetape_plug_pipeline(drive
);
2319 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
))
2320 /* Return a deferred error */
2326 * Wait until all pending pipeline requests are serviced. Typically called on
2329 static void idetape_wait_for_pipeline(ide_drive_t
*drive
)
2331 idetape_tape_t
*tape
= drive
->driver_data
;
2332 unsigned long flags
;
2334 while (tape
->next_stage
|| idetape_pipeline_active(tape
)) {
2335 idetape_plug_pipeline(drive
);
2336 spin_lock_irqsave(&tape
->lock
, flags
);
2337 if (idetape_pipeline_active(tape
))
2338 idetape_wait_for_request(drive
, tape
->active_data_rq
);
2339 spin_unlock_irqrestore(&tape
->lock
, flags
);
2343 static void idetape_empty_write_pipeline(ide_drive_t
*drive
)
2345 idetape_tape_t
*tape
= drive
->driver_data
;
2347 struct idetape_bh
*bh
;
2349 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
2350 printk(KERN_ERR
"ide-tape: bug: Trying to empty write pipeline,"
2351 " but we are not writing.\n");
2354 if (tape
->merge_stage_size
> tape
->stage_size
) {
2355 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
2356 tape
->merge_stage_size
= tape
->stage_size
;
2358 if (tape
->merge_stage_size
) {
2359 blocks
= tape
->merge_stage_size
/ tape
->blk_size
;
2360 if (tape
->merge_stage_size
% tape
->blk_size
) {
2364 i
= tape
->blk_size
- tape
->merge_stage_size
%
2366 bh
= tape
->bh
->b_reqnext
;
2368 atomic_set(&bh
->b_count
, 0);
2374 printk(KERN_INFO
"ide-tape: bug,"
2378 min
= min(i
, (unsigned int)(bh
->b_size
-
2379 atomic_read(&bh
->b_count
)));
2380 memset(bh
->b_data
+ atomic_read(&bh
->b_count
),
2382 atomic_add(min
, &bh
->b_count
);
2387 (void) idetape_add_chrdev_write_request(drive
, blocks
);
2388 tape
->merge_stage_size
= 0;
2390 idetape_wait_for_pipeline(drive
);
2391 if (tape
->merge_stage
!= NULL
) {
2392 __idetape_kfree_stage(tape
->merge_stage
);
2393 tape
->merge_stage
= NULL
;
2395 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
2396 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2399 * On the next backup, perform the feedback loop again. (I don't want to
2400 * keep sense information between backups, as some systems are
2401 * constantly on, and the system load can be totally different on the
2404 tape
->max_stages
= tape
->min_pipeline
;
2405 if (tape
->first_stage
!= NULL
||
2406 tape
->next_stage
!= NULL
||
2407 tape
->last_stage
!= NULL
||
2408 tape
->nr_stages
!= 0) {
2409 printk(KERN_ERR
"ide-tape: ide-tape pipeline bug, "
2410 "first_stage %p, next_stage %p, "
2411 "last_stage %p, nr_stages %d\n",
2412 tape
->first_stage
, tape
->next_stage
,
2413 tape
->last_stage
, tape
->nr_stages
);
2417 static void idetape_restart_speed_control(ide_drive_t
*drive
)
2419 idetape_tape_t
*tape
= drive
->driver_data
;
2421 tape
->restart_speed_control_req
= 0;
2422 tape
->pipeline_head
= 0;
2423 tape
->controlled_last_pipeline_head
= 0;
2424 tape
->controlled_previous_pipeline_head
= 0;
2425 tape
->uncontrolled_previous_pipeline_head
= 0;
2426 tape
->controlled_pipeline_head_speed
= 5000;
2427 tape
->pipeline_head_speed
= 5000;
2428 tape
->uncontrolled_pipeline_head_speed
= 0;
2429 tape
->controlled_pipeline_head_time
=
2430 tape
->uncontrolled_pipeline_head_time
= jiffies
;
2431 tape
->controlled_previous_head_time
=
2432 tape
->uncontrolled_previous_head_time
= jiffies
;
2435 static int idetape_init_read(ide_drive_t
*drive
, int max_stages
)
2437 idetape_tape_t
*tape
= drive
->driver_data
;
2438 idetape_stage_t
*new_stage
;
2441 u16 blocks
= *(u16
*)&tape
->caps
[12];
2443 /* Initialize read operation */
2444 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
2445 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
2446 idetape_empty_write_pipeline(drive
);
2447 idetape_flush_tape_buffers(drive
);
2449 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
2450 printk(KERN_ERR
"ide-tape: merge_stage_size should be"
2452 tape
->merge_stage_size
= 0;
2454 tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 0, 0);
2455 if (!tape
->merge_stage
)
2457 tape
->chrdev_dir
= IDETAPE_DIR_READ
;
2460 * Issue a read 0 command to ensure that DSC handshake is
2461 * switched from completion mode to buffer available mode.
2462 * No point in issuing this if DSC overlap isn't supported, some
2463 * drives (Seagate STT3401A) will return an error.
2465 if (drive
->dsc_overlap
) {
2466 bytes_read
= idetape_queue_rw_tail(drive
,
2467 REQ_IDETAPE_READ
, 0,
2468 tape
->merge_stage
->bh
);
2469 if (bytes_read
< 0) {
2470 __idetape_kfree_stage(tape
->merge_stage
);
2471 tape
->merge_stage
= NULL
;
2472 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2477 if (tape
->restart_speed_control_req
)
2478 idetape_restart_speed_control(drive
);
2479 idetape_init_rq(&rq
, REQ_IDETAPE_READ
);
2480 rq
.sector
= tape
->first_frame
;
2481 rq
.nr_sectors
= blocks
;
2482 rq
.current_nr_sectors
= blocks
;
2483 if (!test_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
) &&
2484 tape
->nr_stages
< max_stages
) {
2485 new_stage
= idetape_kmalloc_stage(tape
);
2486 while (new_stage
!= NULL
) {
2488 idetape_add_stage_tail(drive
, new_stage
);
2489 if (tape
->nr_stages
>= max_stages
)
2491 new_stage
= idetape_kmalloc_stage(tape
);
2494 if (!idetape_pipeline_active(tape
)) {
2495 if (tape
->nr_pending_stages
>= 3 * max_stages
/ 4) {
2496 tape
->measure_insert_time
= 1;
2497 tape
->insert_time
= jiffies
;
2498 tape
->insert_size
= 0;
2499 tape
->insert_speed
= 0;
2500 idetape_plug_pipeline(drive
);
2507 * Called from idetape_chrdev_read() to service a character device read request
2508 * and add read-ahead requests to our pipeline.
2510 static int idetape_add_chrdev_read_request(ide_drive_t
*drive
, int blocks
)
2512 idetape_tape_t
*tape
= drive
->driver_data
;
2513 unsigned long flags
;
2514 struct request
*rq_ptr
;
2517 debug_log(DBG_PROCS
, "Enter %s, %d blocks\n", __func__
, blocks
);
2519 /* If we are at a filemark, return a read length of 0 */
2520 if (test_bit(IDETAPE_FILEMARK
, &tape
->flags
))
2523 /* Wait for the next block to reach the head of the pipeline. */
2524 idetape_init_read(drive
, tape
->max_stages
);
2525 if (tape
->first_stage
== NULL
) {
2526 if (test_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
))
2528 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
,
2529 tape
->merge_stage
->bh
);
2531 idetape_wait_first_stage(drive
);
2532 rq_ptr
= &tape
->first_stage
->rq
;
2533 bytes_read
= tape
->blk_size
* (rq_ptr
->nr_sectors
-
2534 rq_ptr
->current_nr_sectors
);
2535 rq_ptr
->nr_sectors
= 0;
2536 rq_ptr
->current_nr_sectors
= 0;
2538 if (rq_ptr
->errors
== IDETAPE_ERROR_EOD
)
2541 idetape_switch_buffers(tape
, tape
->first_stage
);
2542 if (rq_ptr
->errors
== IDETAPE_ERROR_FILEMARK
)
2543 set_bit(IDETAPE_FILEMARK
, &tape
->flags
);
2544 spin_lock_irqsave(&tape
->lock
, flags
);
2545 idetape_remove_stage_head(drive
);
2546 spin_unlock_irqrestore(&tape
->lock
, flags
);
2547 tape
->pipeline_head
++;
2548 idetape_calculate_speeds(drive
);
2550 if (bytes_read
> blocks
* tape
->blk_size
) {
2551 printk(KERN_ERR
"ide-tape: bug: trying to return more bytes"
2552 " than requested\n");
2553 bytes_read
= blocks
* tape
->blk_size
;
2555 return (bytes_read
);
2558 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
2560 idetape_tape_t
*tape
= drive
->driver_data
;
2561 struct idetape_bh
*bh
;
2567 bh
= tape
->merge_stage
->bh
;
2568 count
= min(tape
->stage_size
, bcount
);
2570 blocks
= count
/ tape
->blk_size
;
2572 atomic_set(&bh
->b_count
,
2573 min(count
, (unsigned int)bh
->b_size
));
2574 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
2575 count
-= atomic_read(&bh
->b_count
);
2578 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
,
2579 tape
->merge_stage
->bh
);
2583 static int idetape_pipeline_size(ide_drive_t
*drive
)
2585 idetape_tape_t
*tape
= drive
->driver_data
;
2586 idetape_stage_t
*stage
;
2590 idetape_wait_for_pipeline(drive
);
2591 stage
= tape
->first_stage
;
2592 while (stage
!= NULL
) {
2594 size
+= tape
->blk_size
* (rq
->nr_sectors
-
2595 rq
->current_nr_sectors
);
2596 if (rq
->errors
== IDETAPE_ERROR_FILEMARK
)
2597 size
+= tape
->blk_size
;
2598 stage
= stage
->next
;
2600 size
+= tape
->merge_stage_size
;
2605 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
2606 * currently support only one partition.
2608 static int idetape_rewind_tape(ide_drive_t
*drive
)
2612 idetape_tape_t
*tape
;
2613 tape
= drive
->driver_data
;
2615 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
2617 idetape_create_rewind_cmd(drive
, &pc
);
2618 retval
= idetape_queue_pc_tail(drive
, &pc
);
2622 idetape_create_read_position_cmd(&pc
);
2623 retval
= idetape_queue_pc_tail(drive
, &pc
);
2629 /* mtio.h compatible commands should be issued to the chrdev interface. */
2630 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
2633 idetape_tape_t
*tape
= drive
->driver_data
;
2634 void __user
*argp
= (void __user
*)arg
;
2636 struct idetape_config
{
2637 int dsc_rw_frequency
;
2638 int dsc_media_access_frequency
;
2642 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
2646 if (copy_from_user(&config
, argp
, sizeof(config
)))
2648 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
2649 tape
->max_stages
= config
.nr_stages
;
2652 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
2653 config
.nr_stages
= tape
->max_stages
;
2654 if (copy_to_user(argp
, &config
, sizeof(config
)))
2664 * The function below is now a bit more complicated than just passing the
2665 * command to the tape since we may have crossed some filemarks during our
2666 * pipelined read-ahead mode. As a minor side effect, the pipeline enables us to
2667 * support MTFSFM when the filemark is in our internal pipeline even if the tape
2668 * doesn't support spacing over filemarks in the reverse direction.
2670 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
2673 idetape_tape_t
*tape
= drive
->driver_data
;
2675 unsigned long flags
;
2676 int retval
, count
= 0;
2677 int sprev
= !!(tape
->caps
[4] & 0x20);
2681 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
2684 mt_count
= -mt_count
;
2687 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
2688 /* its a read-ahead buffer, scan it for crossed filemarks. */
2689 tape
->merge_stage_size
= 0;
2690 if (test_and_clear_bit(IDETAPE_FILEMARK
, &tape
->flags
))
2692 while (tape
->first_stage
!= NULL
) {
2693 if (count
== mt_count
) {
2694 if (mt_op
== MTFSFM
)
2695 set_bit(IDETAPE_FILEMARK
, &tape
->flags
);
2698 spin_lock_irqsave(&tape
->lock
, flags
);
2699 if (tape
->first_stage
== tape
->active_stage
) {
2701 * We have reached the active stage in the read
2702 * pipeline. There is no point in allowing the
2703 * drive to continue reading any farther, so we
2704 * stop the pipeline.
2706 * This section should be moved to a separate
2707 * subroutine because similar operations are
2708 * done in __idetape_discard_read_pipeline(),
2711 tape
->next_stage
= NULL
;
2712 spin_unlock_irqrestore(&tape
->lock
, flags
);
2713 idetape_wait_first_stage(drive
);
2714 tape
->next_stage
= tape
->first_stage
->next
;
2716 spin_unlock_irqrestore(&tape
->lock
, flags
);
2717 if (tape
->first_stage
->rq
.errors
==
2718 IDETAPE_ERROR_FILEMARK
)
2720 idetape_remove_stage_head(drive
);
2722 idetape_discard_read_pipeline(drive
, 0);
2726 * The filemark was not found in our internal pipeline; now we can issue
2727 * the space command.
2732 idetape_create_space_cmd(&pc
, mt_count
- count
,
2733 IDETAPE_SPACE_OVER_FILEMARK
);
2734 return idetape_queue_pc_tail(drive
, &pc
);
2739 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
2743 count
= (MTBSFM
== mt_op
? 1 : -1);
2744 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
2746 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
2753 * Our character device read / write functions.
2755 * The tape is optimized to maximize throughput when it is transferring an
2756 * integral number of the "continuous transfer limit", which is a parameter of
2757 * the specific tape (26kB on my particular tape, 32kB for Onstream).
2759 * As of version 1.3 of the driver, the character device provides an abstract
2760 * continuous view of the media - any mix of block sizes (even 1 byte) on the
2761 * same backup/restore procedure is supported. The driver will internally
2762 * convert the requests to the recommended transfer unit, so that an unmatch
2763 * between the user's block size to the recommended size will only result in a
2764 * (slightly) increased driver overhead, but will no longer hit performance.
2765 * This is not applicable to Onstream.
2767 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
2768 size_t count
, loff_t
*ppos
)
2770 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2771 ide_drive_t
*drive
= tape
->drive
;
2772 ssize_t bytes_read
, temp
, actually_read
= 0, rc
;
2774 u16 ctl
= *(u16
*)&tape
->caps
[12];
2776 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
2778 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
2779 if (test_bit(IDETAPE_DETECT_BS
, &tape
->flags
))
2780 if (count
> tape
->blk_size
&&
2781 (count
% tape
->blk_size
) == 0)
2782 tape
->user_bs_factor
= count
/ tape
->blk_size
;
2784 rc
= idetape_init_read(drive
, tape
->max_stages
);
2789 if (tape
->merge_stage_size
) {
2790 actually_read
= min((unsigned int)(tape
->merge_stage_size
),
2791 (unsigned int)count
);
2792 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
,
2795 buf
+= actually_read
;
2796 tape
->merge_stage_size
-= actually_read
;
2797 count
-= actually_read
;
2799 while (count
>= tape
->stage_size
) {
2800 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
2801 if (bytes_read
<= 0)
2803 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
,
2807 count
-= bytes_read
;
2808 actually_read
+= bytes_read
;
2811 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
2812 if (bytes_read
<= 0)
2814 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
2815 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
,
2818 actually_read
+= temp
;
2819 tape
->merge_stage_size
= bytes_read
-temp
;
2822 if (!actually_read
&& test_bit(IDETAPE_FILEMARK
, &tape
->flags
)) {
2823 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
2825 idetape_space_over_filemarks(drive
, MTFSF
, 1);
2829 return ret
? ret
: actually_read
;
2832 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
2833 size_t count
, loff_t
*ppos
)
2835 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2836 ide_drive_t
*drive
= tape
->drive
;
2837 ssize_t actually_written
= 0;
2839 u16 ctl
= *(u16
*)&tape
->caps
[12];
2841 /* The drive is write protected. */
2842 if (tape
->write_prot
)
2845 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
2847 /* Initialize write operation */
2848 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
2849 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
2850 idetape_discard_read_pipeline(drive
, 1);
2851 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
2852 printk(KERN_ERR
"ide-tape: merge_stage_size "
2853 "should be 0 now\n");
2854 tape
->merge_stage_size
= 0;
2856 tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 0, 0);
2857 if (!tape
->merge_stage
)
2859 tape
->chrdev_dir
= IDETAPE_DIR_WRITE
;
2860 idetape_init_merge_stage(tape
);
2863 * Issue a write 0 command to ensure that DSC handshake is
2864 * switched from completion mode to buffer available mode. No
2865 * point in issuing this if DSC overlap isn't supported, some
2866 * drives (Seagate STT3401A) will return an error.
2868 if (drive
->dsc_overlap
) {
2869 ssize_t retval
= idetape_queue_rw_tail(drive
,
2870 REQ_IDETAPE_WRITE
, 0,
2871 tape
->merge_stage
->bh
);
2873 __idetape_kfree_stage(tape
->merge_stage
);
2874 tape
->merge_stage
= NULL
;
2875 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2882 if (tape
->restart_speed_control_req
)
2883 idetape_restart_speed_control(drive
);
2884 if (tape
->merge_stage_size
) {
2885 if (tape
->merge_stage_size
>= tape
->stage_size
) {
2886 printk(KERN_ERR
"ide-tape: bug: merge buf too big\n");
2887 tape
->merge_stage_size
= 0;
2889 actually_written
= min((unsigned int)
2890 (tape
->stage_size
- tape
->merge_stage_size
),
2891 (unsigned int)count
);
2892 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
,
2895 buf
+= actually_written
;
2896 tape
->merge_stage_size
+= actually_written
;
2897 count
-= actually_written
;
2899 if (tape
->merge_stage_size
== tape
->stage_size
) {
2901 tape
->merge_stage_size
= 0;
2902 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
2907 while (count
>= tape
->stage_size
) {
2909 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
,
2912 buf
+= tape
->stage_size
;
2913 count
-= tape
->stage_size
;
2914 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
2915 actually_written
+= tape
->stage_size
;
2920 actually_written
+= count
;
2921 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
,
2924 tape
->merge_stage_size
+= count
;
2926 return ret
? ret
: actually_written
;
2929 static int idetape_write_filemark(ide_drive_t
*drive
)
2933 /* Write a filemark */
2934 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
2935 if (idetape_queue_pc_tail(drive
, &pc
)) {
2936 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
2943 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
2946 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
2947 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
2948 * usually not supported (it is supported in the rare case in which we crossed
2949 * the filemark during our read-ahead pipelined operation mode).
2951 * The following commands are currently not supported:
2953 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
2954 * MT_ST_WRITE_THRESHOLD.
2956 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
2958 idetape_tape_t
*tape
= drive
->driver_data
;
2962 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
2965 /* Commands which need our pipelined read-ahead stages. */
2973 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
2980 if (tape
->write_prot
)
2982 idetape_discard_read_pipeline(drive
, 1);
2983 for (i
= 0; i
< mt_count
; i
++) {
2984 retval
= idetape_write_filemark(drive
);
2990 idetape_discard_read_pipeline(drive
, 0);
2991 if (idetape_rewind_tape(drive
))
2995 idetape_discard_read_pipeline(drive
, 0);
2996 idetape_create_load_unload_cmd(drive
, &pc
,
2997 IDETAPE_LU_LOAD_MASK
);
2998 return idetape_queue_pc_tail(drive
, &pc
);
3002 * If door is locked, attempt to unlock before
3003 * attempting to eject.
3005 if (tape
->door_locked
) {
3006 if (idetape_create_prevent_cmd(drive
, &pc
, 0))
3007 if (!idetape_queue_pc_tail(drive
, &pc
))
3008 tape
->door_locked
= DOOR_UNLOCKED
;
3010 idetape_discard_read_pipeline(drive
, 0);
3011 idetape_create_load_unload_cmd(drive
, &pc
,
3012 !IDETAPE_LU_LOAD_MASK
);
3013 retval
= idetape_queue_pc_tail(drive
, &pc
);
3015 clear_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
);
3018 idetape_discard_read_pipeline(drive
, 0);
3019 return idetape_flush_tape_buffers(drive
);
3021 idetape_discard_read_pipeline(drive
, 0);
3022 idetape_create_load_unload_cmd(drive
, &pc
,
3023 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
3024 return idetape_queue_pc_tail(drive
, &pc
);
3026 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
3027 return idetape_queue_pc_tail(drive
, &pc
);
3029 (void)idetape_rewind_tape(drive
);
3030 idetape_create_erase_cmd(&pc
);
3031 return idetape_queue_pc_tail(drive
, &pc
);
3034 if (mt_count
< tape
->blk_size
||
3035 mt_count
% tape
->blk_size
)
3037 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
3038 clear_bit(IDETAPE_DETECT_BS
, &tape
->flags
);
3040 set_bit(IDETAPE_DETECT_BS
, &tape
->flags
);
3043 idetape_discard_read_pipeline(drive
, 0);
3044 return idetape_position_tape(drive
,
3045 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
3047 idetape_discard_read_pipeline(drive
, 0);
3048 return idetape_position_tape(drive
, 0, mt_count
, 0);
3052 if (!idetape_create_prevent_cmd(drive
, &pc
, 1))
3054 retval
= idetape_queue_pc_tail(drive
, &pc
);
3057 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
3060 if (!idetape_create_prevent_cmd(drive
, &pc
, 0))
3062 retval
= idetape_queue_pc_tail(drive
, &pc
);
3065 tape
->door_locked
= DOOR_UNLOCKED
;
3068 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
3075 * Our character device ioctls. General mtio.h magnetic io commands are
3076 * supported here, and not in the corresponding block interface. Our own
3077 * ide-tape ioctls are supported on both interfaces.
3079 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
3080 unsigned int cmd
, unsigned long arg
)
3082 struct ide_tape_obj
*tape
= ide_tape_f(file
);
3083 ide_drive_t
*drive
= tape
->drive
;
3087 int block_offset
= 0, position
= tape
->first_frame
;
3088 void __user
*argp
= (void __user
*)arg
;
3090 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
3092 tape
->restart_speed_control_req
= 1;
3093 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
3094 idetape_empty_write_pipeline(drive
);
3095 idetape_flush_tape_buffers(drive
);
3097 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
3098 block_offset
= idetape_pipeline_size(drive
) /
3099 (tape
->blk_size
* tape
->user_bs_factor
);
3100 position
= idetape_read_position(drive
);
3106 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
3108 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
3110 memset(&mtget
, 0, sizeof(struct mtget
));
3111 mtget
.mt_type
= MT_ISSCSI2
;
3112 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
3114 ((tape
->blk_size
* tape
->user_bs_factor
)
3115 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
3117 if (tape
->drv_write_prot
)
3118 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
3120 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
3124 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
3125 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
3129 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
3130 idetape_discard_read_pipeline(drive
, 1);
3131 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
3136 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
3137 * block size with the reported value.
3139 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
3141 idetape_tape_t
*tape
= drive
->driver_data
;
3144 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
3145 if (idetape_queue_pc_tail(drive
, &pc
)) {
3146 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
3147 if (tape
->blk_size
== 0) {
3148 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
3149 "block size, assuming 32k\n");
3150 tape
->blk_size
= 32768;
3154 tape
->blk_size
= (pc
.buffer
[4 + 5] << 16) +
3155 (pc
.buffer
[4 + 6] << 8) +
3157 tape
->drv_write_prot
= (pc
.buffer
[2] & 0x80) >> 7;
3160 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
3162 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
3164 idetape_tape_t
*tape
;
3168 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
3171 tape
= ide_tape_chrdev_get(i
);
3175 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
3178 * We really want to do nonseekable_open(inode, filp); here, but some
3179 * versions of tar incorrectly call lseek on tapes and bail out if that
3180 * fails. So we disallow pread() and pwrite(), but permit lseeks.
3182 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
3184 drive
= tape
->drive
;
3186 filp
->private_data
= tape
;
3188 if (test_and_set_bit(IDETAPE_BUSY
, &tape
->flags
)) {
3193 retval
= idetape_wait_ready(drive
, 60 * HZ
);
3195 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
3196 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
3200 idetape_read_position(drive
);
3201 if (!test_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
))
3202 (void)idetape_rewind_tape(drive
);
3204 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
3205 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
3207 /* Read block size and write protect status from drive. */
3208 ide_tape_get_bsize_from_bdesc(drive
);
3210 /* Set write protect flag if device is opened as read-only. */
3211 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
3212 tape
->write_prot
= 1;
3214 tape
->write_prot
= tape
->drv_write_prot
;
3216 /* Make sure drive isn't write protected if user wants to write. */
3217 if (tape
->write_prot
) {
3218 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
3219 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
3220 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
3226 /* Lock the tape drive door so user can't eject. */
3227 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
3228 if (idetape_create_prevent_cmd(drive
, &pc
, 1)) {
3229 if (!idetape_queue_pc_tail(drive
, &pc
)) {
3230 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
3231 tape
->door_locked
= DOOR_LOCKED
;
3235 idetape_restart_speed_control(drive
);
3236 tape
->restart_speed_control_req
= 0;
3244 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
3246 idetape_tape_t
*tape
= drive
->driver_data
;
3248 idetape_empty_write_pipeline(drive
);
3249 tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 1, 0);
3250 if (tape
->merge_stage
!= NULL
) {
3251 idetape_pad_zeros(drive
, tape
->blk_size
*
3252 (tape
->user_bs_factor
- 1));
3253 __idetape_kfree_stage(tape
->merge_stage
);
3254 tape
->merge_stage
= NULL
;
3256 idetape_write_filemark(drive
);
3257 idetape_flush_tape_buffers(drive
);
3258 idetape_flush_tape_buffers(drive
);
3261 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
3263 struct ide_tape_obj
*tape
= ide_tape_f(filp
);
3264 ide_drive_t
*drive
= tape
->drive
;
3266 unsigned int minor
= iminor(inode
);
3269 tape
= drive
->driver_data
;
3271 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
3273 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
3274 idetape_write_release(drive
, minor
);
3275 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
3277 idetape_discard_read_pipeline(drive
, 1);
3279 idetape_wait_for_pipeline(drive
);
3281 if (tape
->cache_stage
!= NULL
) {
3282 __idetape_kfree_stage(tape
->cache_stage
);
3283 tape
->cache_stage
= NULL
;
3285 if (minor
< 128 && test_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
))
3286 (void) idetape_rewind_tape(drive
);
3287 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
3288 if (tape
->door_locked
== DOOR_LOCKED
) {
3289 if (idetape_create_prevent_cmd(drive
, &pc
, 0)) {
3290 if (!idetape_queue_pc_tail(drive
, &pc
))
3291 tape
->door_locked
= DOOR_UNLOCKED
;
3295 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
3302 * check the contents of the ATAPI IDENTIFY command results. We return:
3304 * 1 - If the tape can be supported by us, based on the information we have so
3307 * 0 - If this tape driver is not currently supported by us.
3309 static int idetape_identify_device(ide_drive_t
*drive
)
3311 u8 gcw
[2], protocol
, device_type
, removable
, packet_size
;
3313 if (drive
->id_read
== 0)
3316 *((unsigned short *) &gcw
) = drive
->id
->config
;
3318 protocol
= (gcw
[1] & 0xC0) >> 6;
3319 device_type
= gcw
[1] & 0x1F;
3320 removable
= !!(gcw
[0] & 0x80);
3321 packet_size
= gcw
[0] & 0x3;
3323 /* Check that we can support this device */
3325 printk(KERN_ERR
"ide-tape: Protocol (0x%02x) is not ATAPI\n",
3327 else if (device_type
!= 1)
3328 printk(KERN_ERR
"ide-tape: Device type (0x%02x) is not set "
3329 "to tape\n", device_type
);
3330 else if (!removable
)
3331 printk(KERN_ERR
"ide-tape: The removable flag is not set\n");
3332 else if (packet_size
!= 0) {
3333 printk(KERN_ERR
"ide-tape: Packet size (0x%02x) is not 12"
3334 " bytes\n", packet_size
);
3340 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
3342 idetape_tape_t
*tape
= drive
->driver_data
;
3344 char fw_rev
[6], vendor_id
[10], product_id
[18];
3346 idetape_create_inquiry_cmd(&pc
);
3347 if (idetape_queue_pc_tail(drive
, &pc
)) {
3348 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
3352 memcpy(vendor_id
, &pc
.buffer
[8], 8);
3353 memcpy(product_id
, &pc
.buffer
[16], 16);
3354 memcpy(fw_rev
, &pc
.buffer
[32], 4);
3356 ide_fixstring(vendor_id
, 10, 0);
3357 ide_fixstring(product_id
, 18, 0);
3358 ide_fixstring(fw_rev
, 6, 0);
3360 printk(KERN_INFO
"ide-tape: %s <-> %s: %s %s rev %s\n",
3361 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
3365 * Ask the tape about its various parameters. In particular, we will adjust our
3366 * data transfer buffer size to the recommended value as returned by the tape.
3368 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
3370 idetape_tape_t
*tape
= drive
->driver_data
;
3373 u8 speed
, max_speed
;
3375 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
3376 if (idetape_queue_pc_tail(drive
, &pc
)) {
3377 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
3378 " some default values\n");
3379 tape
->blk_size
= 512;
3380 put_unaligned(52, (u16
*)&tape
->caps
[12]);
3381 put_unaligned(540, (u16
*)&tape
->caps
[14]);
3382 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
3385 caps
= pc
.buffer
+ 4 + pc
.buffer
[3];
3387 /* convert to host order and save for later use */
3388 speed
= be16_to_cpu(*(u16
*)&caps
[14]);
3389 max_speed
= be16_to_cpu(*(u16
*)&caps
[8]);
3391 put_unaligned(max_speed
, (u16
*)&caps
[8]);
3392 put_unaligned(be16_to_cpu(*(u16
*)&caps
[12]), (u16
*)&caps
[12]);
3393 put_unaligned(speed
, (u16
*)&caps
[14]);
3394 put_unaligned(be16_to_cpu(*(u16
*)&caps
[16]), (u16
*)&caps
[16]);
3397 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
3398 "(assuming 650KB/sec)\n", drive
->name
);
3399 put_unaligned(650, (u16
*)&caps
[14]);
3402 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
3403 "(assuming 650KB/sec)\n", drive
->name
);
3404 put_unaligned(650, (u16
*)&caps
[8]);
3407 memcpy(&tape
->caps
, caps
, 20);
3409 tape
->blk_size
= 512;
3410 else if (caps
[7] & 0x04)
3411 tape
->blk_size
= 1024;
3414 #ifdef CONFIG_IDE_PROC_FS
3415 static void idetape_add_settings(ide_drive_t
*drive
)
3417 idetape_tape_t
*tape
= drive
->driver_data
;
3419 ide_add_setting(drive
, "buffer", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
3420 1, 2, (u16
*)&tape
->caps
[16], NULL
);
3421 ide_add_setting(drive
, "pipeline_min", SETTING_RW
, TYPE_INT
, 1, 0xffff,
3422 tape
->stage_size
/ 1024, 1, &tape
->min_pipeline
, NULL
);
3423 ide_add_setting(drive
, "pipeline", SETTING_RW
, TYPE_INT
, 1, 0xffff,
3424 tape
->stage_size
/ 1024, 1, &tape
->max_stages
, NULL
);
3425 ide_add_setting(drive
, "pipeline_max", SETTING_RW
, TYPE_INT
, 1, 0xffff,
3426 tape
->stage_size
/ 1024, 1, &tape
->max_pipeline
, NULL
);
3427 ide_add_setting(drive
, "pipeline_used", SETTING_READ
, TYPE_INT
, 0,
3428 0xffff, tape
->stage_size
/ 1024, 1, &tape
->nr_stages
,
3430 ide_add_setting(drive
, "pipeline_pending", SETTING_READ
, TYPE_INT
, 0,
3431 0xffff, tape
->stage_size
/ 1024, 1,
3432 &tape
->nr_pending_stages
, NULL
);
3433 ide_add_setting(drive
, "speed", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
3434 1, 1, (u16
*)&tape
->caps
[14], NULL
);
3435 ide_add_setting(drive
, "stage", SETTING_READ
, TYPE_INT
, 0, 0xffff, 1,
3436 1024, &tape
->stage_size
, NULL
);
3437 ide_add_setting(drive
, "tdsc", SETTING_RW
, TYPE_INT
, IDETAPE_DSC_RW_MIN
,
3438 IDETAPE_DSC_RW_MAX
, 1000, HZ
, &tape
->best_dsc_rw_freq
,
3440 ide_add_setting(drive
, "dsc_overlap", SETTING_RW
, TYPE_BYTE
, 0, 1, 1,
3441 1, &drive
->dsc_overlap
, NULL
);
3442 ide_add_setting(drive
, "pipeline_head_speed_c", SETTING_READ
, TYPE_INT
,
3443 0, 0xffff, 1, 1, &tape
->controlled_pipeline_head_speed
,
3445 ide_add_setting(drive
, "pipeline_head_speed_u", SETTING_READ
, TYPE_INT
,
3447 &tape
->uncontrolled_pipeline_head_speed
, NULL
);
3448 ide_add_setting(drive
, "avg_speed", SETTING_READ
, TYPE_INT
, 0, 0xffff,
3449 1, 1, &tape
->avg_speed
, NULL
);
3450 ide_add_setting(drive
, "debug_mask", SETTING_RW
, TYPE_INT
, 0, 0xffff, 1,
3451 1, &tape
->debug_mask
, NULL
);
3454 static inline void idetape_add_settings(ide_drive_t
*drive
) { ; }
3458 * The function below is called to:
3460 * 1. Initialize our various state variables.
3461 * 2. Ask the tape for its capabilities.
3462 * 3. Allocate a buffer which will be used for data transfer. The buffer size
3463 * is chosen based on the recommendation which we received in step 2.
3465 * Note that at this point ide.c already assigned us an irq, so that we can
3466 * queue requests here and wait for their completion.
3468 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
3470 unsigned long t1
, tmid
, tn
, t
;
3475 u16
*ctl
= (u16
*)&tape
->caps
[12];
3477 spin_lock_init(&tape
->lock
);
3478 drive
->dsc_overlap
= 1;
3479 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
3480 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
3482 drive
->dsc_overlap
= 0;
3484 /* Seagate Travan drives do not support DSC overlap. */
3485 if (strstr(drive
->id
->model
, "Seagate STT3401"))
3486 drive
->dsc_overlap
= 0;
3487 tape
->minor
= minor
;
3488 tape
->name
[0] = 'h';
3489 tape
->name
[1] = 't';
3490 tape
->name
[2] = '0' + minor
;
3491 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
3492 tape
->pc
= tape
->pc_stack
;
3493 tape
->max_insert_speed
= 10000;
3494 tape
->speed_control
= 1;
3495 *((unsigned short *) &gcw
) = drive
->id
->config
;
3497 /* Command packet DRQ type */
3498 if (((gcw
[0] & 0x60) >> 5) == 1)
3499 set_bit(IDETAPE_DRQ_INTERRUPT
, &tape
->flags
);
3501 tape
->min_pipeline
= 10;
3502 tape
->max_pipeline
= 10;
3503 tape
->max_stages
= 10;
3505 idetape_get_inquiry_results(drive
);
3506 idetape_get_mode_sense_results(drive
);
3507 ide_tape_get_bsize_from_bdesc(drive
);
3508 tape
->user_bs_factor
= 1;
3509 tape
->stage_size
= *ctl
* tape
->blk_size
;
3510 while (tape
->stage_size
> 0xffff) {
3511 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
3513 tape
->stage_size
= *ctl
* tape
->blk_size
;
3515 stage_size
= tape
->stage_size
;
3516 tape
->pages_per_stage
= stage_size
/ PAGE_SIZE
;
3517 if (stage_size
% PAGE_SIZE
) {
3518 tape
->pages_per_stage
++;
3519 tape
->excess_bh_size
= PAGE_SIZE
- stage_size
% PAGE_SIZE
;
3522 /* Select the "best" DSC read/write polling freq and pipeline size. */
3523 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
3525 tape
->max_stages
= speed
* 1000 * 10 / tape
->stage_size
;
3527 /* Limit memory use for pipeline to 10% of physical memory */
3529 if (tape
->max_stages
* tape
->stage_size
>
3530 si
.totalram
* si
.mem_unit
/ 10)
3532 si
.totalram
* si
.mem_unit
/ (10 * tape
->stage_size
);
3534 tape
->max_stages
= min(tape
->max_stages
, IDETAPE_MAX_PIPELINE_STAGES
);
3535 tape
->min_pipeline
= min(tape
->max_stages
, IDETAPE_MIN_PIPELINE_STAGES
);
3536 tape
->max_pipeline
=
3537 min(tape
->max_stages
* 2, IDETAPE_MAX_PIPELINE_STAGES
);
3538 if (tape
->max_stages
== 0) {
3539 tape
->max_stages
= 1;
3540 tape
->min_pipeline
= 1;
3541 tape
->max_pipeline
= 1;
3544 t1
= (tape
->stage_size
* HZ
) / (speed
* 1000);
3545 tmid
= (*(u16
*)&tape
->caps
[16] * 32 * HZ
) / (speed
* 125);
3546 tn
= (IDETAPE_FIFO_THRESHOLD
* tape
->stage_size
* HZ
) / (speed
* 1000);
3548 if (tape
->max_stages
)
3554 * Ensure that the number we got makes sense; limit it within
3555 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
3557 tape
->best_dsc_rw_freq
= max_t(unsigned long,
3558 min_t(unsigned long, t
, IDETAPE_DSC_RW_MAX
),
3559 IDETAPE_DSC_RW_MIN
);
3560 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
3561 "%dkB pipeline, %lums tDSC%s\n",
3562 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
3563 (*(u16
*)&tape
->caps
[16] * 512) / tape
->stage_size
,
3564 tape
->stage_size
/ 1024,
3565 tape
->max_stages
* tape
->stage_size
/ 1024,
3566 tape
->best_dsc_rw_freq
* 1000 / HZ
,
3567 drive
->using_dma
? ", DMA":"");
3569 idetape_add_settings(drive
);
3572 static void ide_tape_remove(ide_drive_t
*drive
)
3574 idetape_tape_t
*tape
= drive
->driver_data
;
3576 ide_proc_unregister_driver(drive
, tape
->driver
);
3578 ide_unregister_region(tape
->disk
);
3583 static void ide_tape_release(struct kref
*kref
)
3585 struct ide_tape_obj
*tape
= to_ide_tape(kref
);
3586 ide_drive_t
*drive
= tape
->drive
;
3587 struct gendisk
*g
= tape
->disk
;
3589 BUG_ON(tape
->first_stage
!= NULL
|| tape
->merge_stage_size
);
3591 drive
->dsc_overlap
= 0;
3592 drive
->driver_data
= NULL
;
3593 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
3594 device_destroy(idetape_sysfs_class
,
3595 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
3596 idetape_devs
[tape
->minor
] = NULL
;
3597 g
->private_data
= NULL
;
3602 #ifdef CONFIG_IDE_PROC_FS
3603 static int proc_idetape_read_name
3604 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
3606 ide_drive_t
*drive
= (ide_drive_t
*) data
;
3607 idetape_tape_t
*tape
= drive
->driver_data
;
3611 len
= sprintf(out
, "%s\n", tape
->name
);
3612 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
3615 static ide_proc_entry_t idetape_proc
[] = {
3616 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
3617 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
3618 { NULL
, 0, NULL
, NULL
}
3622 static int ide_tape_probe(ide_drive_t
*);
3624 static ide_driver_t idetape_driver
= {
3626 .owner
= THIS_MODULE
,
3628 .bus
= &ide_bus_type
,
3630 .probe
= ide_tape_probe
,
3631 .remove
= ide_tape_remove
,
3632 .version
= IDETAPE_VERSION
,
3634 .supports_dsc_overlap
= 1,
3635 .do_request
= idetape_do_request
,
3636 .end_request
= idetape_end_request
,
3637 .error
= __ide_error
,
3638 .abort
= __ide_abort
,
3639 #ifdef CONFIG_IDE_PROC_FS
3640 .proc
= idetape_proc
,
3644 /* Our character device supporting functions, passed to register_chrdev. */
3645 static const struct file_operations idetape_fops
= {
3646 .owner
= THIS_MODULE
,
3647 .read
= idetape_chrdev_read
,
3648 .write
= idetape_chrdev_write
,
3649 .ioctl
= idetape_chrdev_ioctl
,
3650 .open
= idetape_chrdev_open
,
3651 .release
= idetape_chrdev_release
,
3654 static int idetape_open(struct inode
*inode
, struct file
*filp
)
3656 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
3657 struct ide_tape_obj
*tape
;
3659 tape
= ide_tape_get(disk
);
3666 static int idetape_release(struct inode
*inode
, struct file
*filp
)
3668 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
3669 struct ide_tape_obj
*tape
= ide_tape_g(disk
);
3676 static int idetape_ioctl(struct inode
*inode
, struct file
*file
,
3677 unsigned int cmd
, unsigned long arg
)
3679 struct block_device
*bdev
= inode
->i_bdev
;
3680 struct ide_tape_obj
*tape
= ide_tape_g(bdev
->bd_disk
);
3681 ide_drive_t
*drive
= tape
->drive
;
3682 int err
= generic_ide_ioctl(drive
, file
, bdev
, cmd
, arg
);
3684 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
3688 static struct block_device_operations idetape_block_ops
= {
3689 .owner
= THIS_MODULE
,
3690 .open
= idetape_open
,
3691 .release
= idetape_release
,
3692 .ioctl
= idetape_ioctl
,
3695 static int ide_tape_probe(ide_drive_t
*drive
)
3697 idetape_tape_t
*tape
;
3701 if (!strstr("ide-tape", drive
->driver_req
))
3703 if (!drive
->present
)
3705 if (drive
->media
!= ide_tape
)
3707 if (!idetape_identify_device(drive
)) {
3708 printk(KERN_ERR
"ide-tape: %s: not supported by this version of"
3709 " the driver\n", drive
->name
);
3713 printk(KERN_INFO
"ide-tape: passing drive %s to ide-scsi"
3714 " emulation.\n", drive
->name
);
3717 tape
= kzalloc(sizeof(idetape_tape_t
), GFP_KERNEL
);
3719 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape struct\n",
3724 g
= alloc_disk(1 << PARTN_BITS
);
3728 ide_init_disk(g
, drive
);
3730 ide_proc_register_driver(drive
, &idetape_driver
);
3732 kref_init(&tape
->kref
);
3734 tape
->drive
= drive
;
3735 tape
->driver
= &idetape_driver
;
3738 g
->private_data
= &tape
->driver
;
3740 drive
->driver_data
= tape
;
3742 mutex_lock(&idetape_ref_mutex
);
3743 for (minor
= 0; idetape_devs
[minor
]; minor
++)
3745 idetape_devs
[minor
] = tape
;
3746 mutex_unlock(&idetape_ref_mutex
);
3748 idetape_setup(drive
, tape
, minor
);
3750 device_create(idetape_sysfs_class
, &drive
->gendev
,
3751 MKDEV(IDETAPE_MAJOR
, minor
), "%s", tape
->name
);
3752 device_create(idetape_sysfs_class
, &drive
->gendev
,
3753 MKDEV(IDETAPE_MAJOR
, minor
+ 128), "n%s", tape
->name
);
3755 g
->fops
= &idetape_block_ops
;
3756 ide_register_region(g
);
3766 static void __exit
idetape_exit(void)
3768 driver_unregister(&idetape_driver
.gen_driver
);
3769 class_destroy(idetape_sysfs_class
);
3770 unregister_chrdev(IDETAPE_MAJOR
, "ht");
3773 static int __init
idetape_init(void)
3776 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
3777 if (IS_ERR(idetape_sysfs_class
)) {
3778 idetape_sysfs_class
= NULL
;
3779 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
3784 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
3785 printk(KERN_ERR
"ide-tape: Failed to register chrdev"
3788 goto out_free_class
;
3791 error
= driver_register(&idetape_driver
.gen_driver
);
3793 goto out_free_driver
;
3798 driver_unregister(&idetape_driver
.gen_driver
);
3800 class_destroy(idetape_sysfs_class
);
3805 MODULE_ALIAS("ide:*m-tape*");
3806 module_init(idetape_init
);
3807 module_exit(idetape_exit
);
3808 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);
3809 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
3810 MODULE_LICENSE("GPL");