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 #define IDETAPE_MIN_PIPELINE_STAGES 1
89 #define IDETAPE_MAX_PIPELINE_STAGES 400
90 #define IDETAPE_INCREASE_STAGES_RATE 20
93 * After each failed packet command we issue a request sense command and retry
94 * the packet command IDETAPE_MAX_PC_RETRIES times.
96 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
98 #define IDETAPE_MAX_PC_RETRIES 3
101 * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE
102 * bytes. This is used for several packet commands (Not for READ/WRITE commands)
104 #define IDETAPE_PC_BUFFER_SIZE 256
107 * In various places in the driver, we need to allocate storage
108 * for packet commands and requests, which will remain valid while
109 * we leave the driver to wait for an interrupt or a timeout event.
111 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
114 * Some drives (for example, Seagate STT3401A Travan) require a very long
115 * timeout, because they don't return an interrupt or clear their busy bit
116 * until after the command completes (even retension commands).
118 #define IDETAPE_WAIT_CMD (900*HZ)
121 * The following parameter is used to select the point in the internal tape fifo
122 * in which we will start to refill the buffer. Decreasing the following
123 * parameter will improve the system's latency and interactive response, while
124 * using a high value might improve system throughput.
126 #define IDETAPE_FIFO_THRESHOLD 2
129 * DSC polling parameters.
131 * Polling for DSC (a single bit in the status register) is a very important
132 * function in ide-tape. There are two cases in which we poll for DSC:
134 * 1. Before a read/write packet command, to ensure that we can transfer data
135 * from/to the tape's data buffers, without causing an actual media access.
136 * In case the tape is not ready yet, we take out our request from the device
137 * request queue, so that ide.c could service requests from the other device
138 * on the same interface in the meantime.
140 * 2. After the successful initialization of a "media access packet command",
141 * which is a command that can take a long time to complete (the interval can
142 * range from several seconds to even an hour). Again, we postpone our request
143 * in the middle to free the bus for the other device. The polling frequency
144 * here should be lower than the read/write frequency since those media access
145 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
146 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
147 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
149 * We also set a timeout for the timer, in case something goes wrong. The
150 * timeout should be longer then the maximum execution time of a tape operation.
154 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
155 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
156 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
157 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
158 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
159 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
160 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
162 /*************************** End of tunable parameters ***********************/
164 /* Read/Write error simulation */
165 #define SIMULATE_ERRORS 0
167 /* tape directions */
169 IDETAPE_DIR_NONE
= (1 << 0),
170 IDETAPE_DIR_READ
= (1 << 1),
171 IDETAPE_DIR_WRITE
= (1 << 2),
177 struct idetape_bh
*b_reqnext
;
181 /* Tape door status */
182 #define DOOR_UNLOCKED 0
183 #define DOOR_LOCKED 1
184 #define DOOR_EXPLICITLY_LOCKED 2
186 /* Some defines for the SPACE command */
187 #define IDETAPE_SPACE_OVER_FILEMARK 1
188 #define IDETAPE_SPACE_TO_EOD 3
190 /* Some defines for the LOAD UNLOAD command */
191 #define IDETAPE_LU_LOAD_MASK 1
192 #define IDETAPE_LU_RETENSION_MASK 2
193 #define IDETAPE_LU_EOT_MASK 4
196 * Special requests for our block device strategy routine.
198 * In order to service a character device command, we add special requests to
199 * the tail of our block device request queue and wait for their completion.
203 REQ_IDETAPE_PC1
= (1 << 0), /* packet command (first stage) */
204 REQ_IDETAPE_PC2
= (1 << 1), /* packet command (second stage) */
205 REQ_IDETAPE_READ
= (1 << 2),
206 REQ_IDETAPE_WRITE
= (1 << 3),
209 /* Error codes returned in rq->errors to the higher part of the driver. */
210 #define IDETAPE_ERROR_GENERAL 101
211 #define IDETAPE_ERROR_FILEMARK 102
212 #define IDETAPE_ERROR_EOD 103
214 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
215 #define IDETAPE_BLOCK_DESCRIPTOR 0
216 #define IDETAPE_CAPABILITIES_PAGE 0x2a
218 /* Tape flag bits values. */
220 IDETAPE_FLAG_IGNORE_DSC
= (1 << 0),
221 /* 0 When the tape position is unknown */
222 IDETAPE_FLAG_ADDRESS_VALID
= (1 << 1),
223 /* Device already opened */
224 IDETAPE_FLAG_BUSY
= (1 << 2),
225 /* Error detected in a pipeline stage */
226 IDETAPE_FLAG_PIPELINE_ERR
= (1 << 3),
227 /* Attempt to auto-detect the current user block size */
228 IDETAPE_FLAG_DETECT_BS
= (1 << 4),
229 /* Currently on a filemark */
230 IDETAPE_FLAG_FILEMARK
= (1 << 5),
231 /* DRQ interrupt device */
232 IDETAPE_FLAG_DRQ_INTERRUPT
= (1 << 6),
233 /* pipeline active */
234 IDETAPE_FLAG_PIPELINE_ACTIVE
= (1 << 7),
235 /* 0 = no tape is loaded, so we don't rewind after ejecting */
236 IDETAPE_FLAG_MEDIUM_PRESENT
= (1 << 8),
239 /* A pipeline stage. */
240 typedef struct idetape_stage_s
{
241 struct request rq
; /* The corresponding request */
242 struct idetape_bh
*bh
; /* The data buffers */
243 struct idetape_stage_s
*next
; /* Pointer to the next stage */
247 * Most of our global data which we need to save even as we leave the driver due
248 * to an interrupt or a timer event is stored in the struct defined below.
250 typedef struct ide_tape_obj
{
252 ide_driver_t
*driver
;
253 struct gendisk
*disk
;
257 * Since a typical character device operation requires more
258 * than one packet command, we provide here enough memory
259 * for the maximum of interconnected packet commands.
260 * The packet commands are stored in the circular array pc_stack.
261 * pc_stack_index points to the last used entry, and warps around
262 * to the start when we get to the last array entry.
264 * pc points to the current processed packet command.
266 * failed_pc points to the last failed packet command, or contains
267 * NULL if we do not need to retry any packet command. This is
268 * required since an additional packet command is needed before the
269 * retry, to get detailed information on what went wrong.
271 /* Current packet command */
272 struct ide_atapi_pc
*pc
;
273 /* Last failed packet command */
274 struct ide_atapi_pc
*failed_pc
;
275 /* Packet command stack */
276 struct ide_atapi_pc pc_stack
[IDETAPE_PC_STACK
];
277 /* Next free packet command storage space */
279 struct request rq_stack
[IDETAPE_PC_STACK
];
280 /* We implement a circular array */
284 * DSC polling variables.
286 * While polling for DSC we use postponed_rq to postpone the current
287 * request so that ide.c will be able to service pending requests on the
288 * other device. Note that at most we will have only one DSC (usually
289 * data transfer) request in the device request queue. Additional
290 * requests can be queued in our internal pipeline, but they will be
291 * visible to ide.c only one at a time.
293 struct request
*postponed_rq
;
294 /* The time in which we started polling for DSC */
295 unsigned long dsc_polling_start
;
296 /* Timer used to poll for dsc */
297 struct timer_list dsc_timer
;
298 /* Read/Write dsc polling frequency */
299 unsigned long best_dsc_rw_freq
;
300 unsigned long dsc_poll_freq
;
301 unsigned long dsc_timeout
;
303 /* Read position information */
306 unsigned int first_frame
;
308 /* Last error information */
309 u8 sense_key
, asc
, ascq
;
311 /* Character device operation */
315 /* Current character device data transfer direction */
318 /* tape block size, usually 512 or 1024 bytes */
319 unsigned short blk_size
;
322 /* Copy of the tape's Capabilities and Mechanical Page */
326 * Active data transfer request parameters.
328 * At most, there is only one ide-tape originated data transfer request
329 * in the device request queue. This allows ide.c to easily service
330 * requests from the other device when we postpone our active request.
331 * In the pipelined operation mode, we use our internal pipeline
332 * structure to hold more data requests. The data buffer size is chosen
333 * based on the tape's recommendation.
335 /* ptr to the request which is waiting in the device request queue */
336 struct request
*active_data_rq
;
337 /* Data buffer size chosen based on the tape's recommendation */
339 idetape_stage_t
*merge_stage
;
340 int merge_stage_size
;
341 struct idetape_bh
*bh
;
346 * Pipeline parameters.
348 * To accomplish non-pipelined mode, we simply set the following
349 * variables to zero (or NULL, where appropriate).
351 /* Number of currently used stages */
353 /* Number of pending stages */
354 int nr_pending_stages
;
355 /* We will not allocate more than this number of stages */
356 int max_stages
, min_pipeline
, max_pipeline
;
357 /* The first stage which will be removed from the pipeline */
358 idetape_stage_t
*first_stage
;
359 /* The currently active stage */
360 idetape_stage_t
*active_stage
;
361 /* Will be serviced after the currently active request */
362 idetape_stage_t
*next_stage
;
363 /* New requests will be added to the pipeline here */
364 idetape_stage_t
*last_stage
;
366 /* Wasted space in each stage */
369 /* Status/Action flags: long for set_bit */
371 /* protects the ide-tape queue */
374 /* Measures average tape speed */
375 unsigned long avg_time
;
379 /* the door is currently locked */
381 /* the tape hardware is write protected */
383 /* the tape is write protected (hardware or opened as read-only) */
387 * Limit the number of times a request can be postponed, to avoid an
388 * infinite postpone deadlock.
392 /* Speed control at the tape buffers input/output */
393 unsigned long insert_time
;
396 int measure_insert_time
;
401 static DEFINE_MUTEX(idetape_ref_mutex
);
403 static struct class *idetape_sysfs_class
;
405 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
407 #define ide_tape_g(disk) \
408 container_of((disk)->private_data, struct ide_tape_obj, driver)
410 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
412 struct ide_tape_obj
*tape
= NULL
;
414 mutex_lock(&idetape_ref_mutex
);
415 tape
= ide_tape_g(disk
);
417 kref_get(&tape
->kref
);
418 mutex_unlock(&idetape_ref_mutex
);
422 static void ide_tape_release(struct kref
*);
424 static void ide_tape_put(struct ide_tape_obj
*tape
)
426 mutex_lock(&idetape_ref_mutex
);
427 kref_put(&tape
->kref
, ide_tape_release
);
428 mutex_unlock(&idetape_ref_mutex
);
432 * The variables below are used for the character device interface. Additional
433 * state variables are defined in our ide_drive_t structure.
435 static struct ide_tape_obj
*idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
437 #define ide_tape_f(file) ((file)->private_data)
439 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
441 struct ide_tape_obj
*tape
= NULL
;
443 mutex_lock(&idetape_ref_mutex
);
444 tape
= idetape_devs
[i
];
446 kref_get(&tape
->kref
);
447 mutex_unlock(&idetape_ref_mutex
);
451 static void idetape_input_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
454 struct idetape_bh
*bh
= pc
->bh
;
459 printk(KERN_ERR
"ide-tape: bh == NULL in "
460 "idetape_input_buffers\n");
461 ide_atapi_discard_data(drive
, bcount
);
465 (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)),
467 HWIF(drive
)->atapi_input_bytes(drive
, bh
->b_data
+
468 atomic_read(&bh
->b_count
), count
);
470 atomic_add(count
, &bh
->b_count
);
471 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
474 atomic_set(&bh
->b_count
, 0);
480 static void idetape_output_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
483 struct idetape_bh
*bh
= pc
->bh
;
488 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
492 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
493 HWIF(drive
)->atapi_output_bytes(drive
, pc
->b_data
, count
);
496 pc
->b_count
-= count
;
501 pc
->b_data
= bh
->b_data
;
502 pc
->b_count
= atomic_read(&bh
->b_count
);
508 static void idetape_update_buffers(struct ide_atapi_pc
*pc
)
510 struct idetape_bh
*bh
= pc
->bh
;
512 unsigned int bcount
= pc
->xferred
;
514 if (pc
->flags
& PC_FLAG_WRITING
)
518 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
522 count
= min((unsigned int)bh
->b_size
, (unsigned int)bcount
);
523 atomic_set(&bh
->b_count
, count
);
524 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
532 * idetape_next_pc_storage returns a pointer to a place in which we can
533 * safely store a packet command, even though we intend to leave the
534 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
535 * commands is allocated at initialization time.
537 static struct ide_atapi_pc
*idetape_next_pc_storage(ide_drive_t
*drive
)
539 idetape_tape_t
*tape
= drive
->driver_data
;
541 debug_log(DBG_PCRQ_STACK
, "pc_stack_index=%d\n", tape
->pc_stack_index
);
543 if (tape
->pc_stack_index
== IDETAPE_PC_STACK
)
544 tape
->pc_stack_index
= 0;
545 return (&tape
->pc_stack
[tape
->pc_stack_index
++]);
549 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
550 * Since we queue packet commands in the request queue, we need to
551 * allocate a request, along with the allocation of a packet command.
554 /**************************************************************
556 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
557 * followed later on by kfree(). -ml *
559 **************************************************************/
561 static struct request
*idetape_next_rq_storage(ide_drive_t
*drive
)
563 idetape_tape_t
*tape
= drive
->driver_data
;
565 debug_log(DBG_PCRQ_STACK
, "rq_stack_index=%d\n", tape
->rq_stack_index
);
567 if (tape
->rq_stack_index
== IDETAPE_PC_STACK
)
568 tape
->rq_stack_index
= 0;
569 return (&tape
->rq_stack
[tape
->rq_stack_index
++]);
572 static void idetape_init_pc(struct ide_atapi_pc
*pc
)
574 memset(pc
->c
, 0, 12);
578 pc
->buf
= pc
->pc_buf
;
579 pc
->buf_size
= IDETAPE_PC_BUFFER_SIZE
;
585 * called on each failed packet command retry to analyze the request sense. We
586 * currently do not utilize this information.
588 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
590 idetape_tape_t
*tape
= drive
->driver_data
;
591 struct ide_atapi_pc
*pc
= tape
->failed_pc
;
593 tape
->sense_key
= sense
[2] & 0xF;
594 tape
->asc
= sense
[12];
595 tape
->ascq
= sense
[13];
597 debug_log(DBG_ERR
, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
598 pc
->c
[0], tape
->sense_key
, tape
->asc
, tape
->ascq
);
600 /* Correct pc->xferred by asking the tape. */
601 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
602 pc
->xferred
= pc
->req_xfer
-
604 be32_to_cpu(get_unaligned((u32
*)&sense
[3]));
605 idetape_update_buffers(pc
);
609 * If error was the result of a zero-length read or write command,
610 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
611 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
613 if ((pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
)
615 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
616 if (tape
->sense_key
== 5) {
617 /* don't report an error, everything's ok */
619 /* don't retry read/write */
620 pc
->flags
|= PC_FLAG_ABORT
;
623 if (pc
->c
[0] == READ_6
&& (sense
[2] & 0x80)) {
624 pc
->error
= IDETAPE_ERROR_FILEMARK
;
625 pc
->flags
|= PC_FLAG_ABORT
;
627 if (pc
->c
[0] == WRITE_6
) {
628 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
629 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
630 pc
->error
= IDETAPE_ERROR_EOD
;
631 pc
->flags
|= PC_FLAG_ABORT
;
634 if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
635 if (tape
->sense_key
== 8) {
636 pc
->error
= IDETAPE_ERROR_EOD
;
637 pc
->flags
|= PC_FLAG_ABORT
;
639 if (!(pc
->flags
& PC_FLAG_ABORT
) &&
641 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
645 static void idetape_activate_next_stage(ide_drive_t
*drive
)
647 idetape_tape_t
*tape
= drive
->driver_data
;
648 idetape_stage_t
*stage
= tape
->next_stage
;
649 struct request
*rq
= &stage
->rq
;
651 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
654 printk(KERN_ERR
"ide-tape: bug: Trying to activate a non"
655 " existing stage\n");
659 rq
->rq_disk
= tape
->disk
;
661 rq
->special
= (void *)stage
->bh
;
662 tape
->active_data_rq
= rq
;
663 tape
->active_stage
= stage
;
664 tape
->next_stage
= stage
->next
;
667 /* Free a stage along with its related buffers completely. */
668 static void __idetape_kfree_stage(idetape_stage_t
*stage
)
670 struct idetape_bh
*prev_bh
, *bh
= stage
->bh
;
674 if (bh
->b_data
!= NULL
) {
675 size
= (int) bh
->b_size
;
677 free_page((unsigned long) bh
->b_data
);
679 bh
->b_data
+= PAGE_SIZE
;
689 static void idetape_kfree_stage(idetape_tape_t
*tape
, idetape_stage_t
*stage
)
691 __idetape_kfree_stage(stage
);
695 * Remove tape->first_stage from the pipeline. The caller should avoid race
698 static void idetape_remove_stage_head(ide_drive_t
*drive
)
700 idetape_tape_t
*tape
= drive
->driver_data
;
701 idetape_stage_t
*stage
;
703 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
705 if (tape
->first_stage
== NULL
) {
706 printk(KERN_ERR
"ide-tape: bug: tape->first_stage is NULL\n");
709 if (tape
->active_stage
== tape
->first_stage
) {
710 printk(KERN_ERR
"ide-tape: bug: Trying to free our active "
714 stage
= tape
->first_stage
;
715 tape
->first_stage
= stage
->next
;
716 idetape_kfree_stage(tape
, stage
);
718 if (tape
->first_stage
== NULL
) {
719 tape
->last_stage
= NULL
;
720 if (tape
->next_stage
!= NULL
)
721 printk(KERN_ERR
"ide-tape: bug: tape->next_stage !="
724 printk(KERN_ERR
"ide-tape: bug: nr_stages should be 0 "
730 * This will free all the pipeline stages starting from new_last_stage->next
731 * to the end of the list, and point tape->last_stage to new_last_stage.
733 static void idetape_abort_pipeline(ide_drive_t
*drive
,
734 idetape_stage_t
*new_last_stage
)
736 idetape_tape_t
*tape
= drive
->driver_data
;
737 idetape_stage_t
*stage
= new_last_stage
->next
;
738 idetape_stage_t
*nstage
;
740 debug_log(DBG_PROCS
, "%s: Enter %s\n", tape
->name
, __func__
);
743 nstage
= stage
->next
;
744 idetape_kfree_stage(tape
, stage
);
746 --tape
->nr_pending_stages
;
750 new_last_stage
->next
= NULL
;
751 tape
->last_stage
= new_last_stage
;
752 tape
->next_stage
= NULL
;
756 * Finish servicing a request and insert a pending pipeline request into the
759 static int idetape_end_request(ide_drive_t
*drive
, int uptodate
, int nr_sects
)
761 struct request
*rq
= HWGROUP(drive
)->rq
;
762 idetape_tape_t
*tape
= drive
->driver_data
;
765 int remove_stage
= 0;
766 idetape_stage_t
*active_stage
;
768 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
771 case 0: error
= IDETAPE_ERROR_GENERAL
; break;
772 case 1: error
= 0; break;
773 default: error
= uptodate
;
777 tape
->failed_pc
= NULL
;
779 if (!blk_special_request(rq
)) {
780 ide_end_request(drive
, uptodate
, nr_sects
);
784 spin_lock_irqsave(&tape
->lock
, flags
);
786 /* The request was a pipelined data transfer request */
787 if (tape
->active_data_rq
== rq
) {
788 active_stage
= tape
->active_stage
;
789 tape
->active_stage
= NULL
;
790 tape
->active_data_rq
= NULL
;
791 tape
->nr_pending_stages
--;
792 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
795 set_bit(IDETAPE_FLAG_PIPELINE_ERR
,
797 if (error
== IDETAPE_ERROR_EOD
)
798 idetape_abort_pipeline(drive
,
801 } else if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
802 if (error
== IDETAPE_ERROR_EOD
) {
803 set_bit(IDETAPE_FLAG_PIPELINE_ERR
,
805 idetape_abort_pipeline(drive
, active_stage
);
808 if (tape
->next_stage
!= NULL
) {
809 idetape_activate_next_stage(drive
);
811 /* Insert the next request into the request queue. */
812 (void)ide_do_drive_cmd(drive
, tape
->active_data_rq
,
816 * This is a part of the feedback loop which tries to
817 * find the optimum number of stages. We are starting
818 * from a minimum maximum number of stages, and if we
819 * sense that the pipeline is empty, we try to increase
820 * it, until we reach the user compile time memory
823 int i
= (tape
->max_pipeline
- tape
->min_pipeline
) / 10;
825 tape
->max_stages
+= max(i
, 1);
826 tape
->max_stages
= max(tape
->max_stages
,
828 tape
->max_stages
= min(tape
->max_stages
,
832 ide_end_drive_cmd(drive
, 0, 0);
835 idetape_remove_stage_head(drive
);
836 if (tape
->active_data_rq
== NULL
)
837 clear_bit(IDETAPE_FLAG_PIPELINE_ACTIVE
, &tape
->flags
);
838 spin_unlock_irqrestore(&tape
->lock
, flags
);
842 static ide_startstop_t
idetape_request_sense_callback(ide_drive_t
*drive
)
844 idetape_tape_t
*tape
= drive
->driver_data
;
846 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
848 if (!tape
->pc
->error
) {
849 idetape_analyze_error(drive
, tape
->pc
->buf
);
850 idetape_end_request(drive
, 1, 0);
852 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE itself - "
853 "Aborting request!\n");
854 idetape_end_request(drive
, 0, 0);
859 static void idetape_create_request_sense_cmd(struct ide_atapi_pc
*pc
)
862 pc
->c
[0] = REQUEST_SENSE
;
865 pc
->idetape_callback
= &idetape_request_sense_callback
;
868 static void idetape_init_rq(struct request
*rq
, u8 cmd
)
870 memset(rq
, 0, sizeof(*rq
));
871 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
876 * Generate a new packet command request in front of the request queue, before
877 * the current request, so that it will be processed immediately, on the next
878 * pass through the driver. The function below is called from the request
879 * handling part of the driver (the "bottom" part). Safe storage for the request
880 * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that.
882 * Memory for those requests is pre-allocated at initialization time, and is
883 * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for
884 * the maximum possible number of inter-dependent packet commands.
886 * The higher level of the driver - The ioctl handler and the character device
887 * handling functions should queue request to the lower level part and wait for
888 * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail.
890 static void idetape_queue_pc_head(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
893 struct ide_tape_obj
*tape
= drive
->driver_data
;
895 idetape_init_rq(rq
, REQ_IDETAPE_PC1
);
896 rq
->buffer
= (char *) pc
;
897 rq
->rq_disk
= tape
->disk
;
898 (void) ide_do_drive_cmd(drive
, rq
, ide_preempt
);
902 * idetape_retry_pc is called when an error was detected during the
903 * last packet command. We queue a request sense packet command in
904 * the head of the request list.
906 static ide_startstop_t
idetape_retry_pc (ide_drive_t
*drive
)
908 idetape_tape_t
*tape
= drive
->driver_data
;
909 struct ide_atapi_pc
*pc
;
912 (void)ide_read_error(drive
);
913 pc
= idetape_next_pc_storage(drive
);
914 rq
= idetape_next_rq_storage(drive
);
915 idetape_create_request_sense_cmd(pc
);
916 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
917 idetape_queue_pc_head(drive
, pc
, rq
);
922 * Postpone the current request so that ide.c will be able to service requests
923 * from another device on the same hwgroup while we are polling for DSC.
925 static void idetape_postpone_request(ide_drive_t
*drive
)
927 idetape_tape_t
*tape
= drive
->driver_data
;
929 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
931 tape
->postponed_rq
= HWGROUP(drive
)->rq
;
932 ide_stall_queue(drive
, tape
->dsc_poll_freq
);
935 typedef void idetape_io_buf(ide_drive_t
*, struct ide_atapi_pc
*, unsigned int);
938 * This is the usual interrupt handler which will be called during a packet
939 * command. We will transfer some of the data (as requested by the drive) and
940 * will re-point interrupt handler to us. When data transfer is finished, we
941 * will act according to the algorithm described before
944 static ide_startstop_t
idetape_pc_intr(ide_drive_t
*drive
)
946 ide_hwif_t
*hwif
= drive
->hwif
;
947 idetape_tape_t
*tape
= drive
->driver_data
;
948 struct ide_atapi_pc
*pc
= tape
->pc
;
949 xfer_func_t
*xferfunc
;
950 idetape_io_buf
*iobuf
;
953 static int error_sim_count
;
958 debug_log(DBG_PROCS
, "Enter %s - interrupt handler\n", __func__
);
960 /* Clear the interrupt */
961 stat
= ide_read_status(drive
);
963 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
964 if (hwif
->dma_ops
->dma_end(drive
) || (stat
& ERR_STAT
)) {
966 * A DMA error is sometimes expected. For example,
967 * if the tape is crossing a filemark during a
968 * READ command, it will issue an irq and position
969 * itself before the filemark, so that only a partial
970 * data transfer will occur (which causes the DMA
971 * error). In that case, we will later ask the tape
972 * how much bytes of the original request were
973 * actually transferred (we can't receive that
974 * information from the DMA engine on most chipsets).
978 * On the contrary, a DMA error is never expected;
979 * it usually indicates a hardware error or abort.
980 * If the tape crosses a filemark during a READ
981 * command, it will issue an irq and position itself
982 * after the filemark (not before). Only a partial
983 * data transfer will occur, but no DMA error.
986 pc
->flags
|= PC_FLAG_DMA_ERROR
;
988 pc
->xferred
= pc
->req_xfer
;
989 idetape_update_buffers(pc
);
991 debug_log(DBG_PROCS
, "DMA finished\n");
995 /* No more interrupts */
996 if ((stat
& DRQ_STAT
) == 0) {
997 debug_log(DBG_SENSE
, "Packet command completed, %d bytes"
998 " transferred\n", pc
->xferred
);
1000 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
1004 if ((pc
->c
[0] == WRITE_6
|| pc
->c
[0] == READ_6
) &&
1005 (++error_sim_count
% 100) == 0) {
1006 printk(KERN_INFO
"ide-tape: %s: simulating error\n",
1011 if ((stat
& ERR_STAT
) && pc
->c
[0] == REQUEST_SENSE
)
1013 if ((stat
& ERR_STAT
) || (pc
->flags
& PC_FLAG_DMA_ERROR
)) {
1014 /* Error detected */
1015 debug_log(DBG_ERR
, "%s: I/O error\n", tape
->name
);
1017 if (pc
->c
[0] == REQUEST_SENSE
) {
1018 printk(KERN_ERR
"ide-tape: I/O error in request"
1019 " sense command\n");
1020 return ide_do_reset(drive
);
1022 debug_log(DBG_ERR
, "[cmd %x]: check condition\n",
1025 /* Retry operation */
1026 return idetape_retry_pc(drive
);
1029 if ((pc
->flags
& PC_FLAG_WAIT_FOR_DSC
) &&
1030 (stat
& SEEK_STAT
) == 0) {
1031 /* Media access command */
1032 tape
->dsc_polling_start
= jiffies
;
1033 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_FAST
;
1034 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
1035 /* Allow ide.c to handle other requests */
1036 idetape_postpone_request(drive
);
1039 if (tape
->failed_pc
== pc
)
1040 tape
->failed_pc
= NULL
;
1041 /* Command finished - Call the callback function */
1042 return pc
->idetape_callback(drive
);
1045 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
) {
1046 pc
->flags
&= ~PC_FLAG_DMA_IN_PROGRESS
;
1047 printk(KERN_ERR
"ide-tape: The tape wants to issue more "
1048 "interrupts in DMA mode\n");
1049 printk(KERN_ERR
"ide-tape: DMA disabled, reverting to PIO\n");
1051 return ide_do_reset(drive
);
1053 /* Get the number of bytes to transfer on this interrupt. */
1054 bcount
= (hwif
->INB(hwif
->io_ports
[IDE_BCOUNTH_OFFSET
]) << 8) |
1055 hwif
->INB(hwif
->io_ports
[IDE_BCOUNTL_OFFSET
]);
1057 ireason
= hwif
->INB(hwif
->io_ports
[IDE_IREASON_OFFSET
]);
1060 printk(KERN_ERR
"ide-tape: CoD != 0 in %s\n", __func__
);
1061 return ide_do_reset(drive
);
1063 if (((ireason
& IO
) == IO
) == !!(pc
->flags
& PC_FLAG_WRITING
)) {
1064 /* Hopefully, we will never get here */
1065 printk(KERN_ERR
"ide-tape: We wanted to %s, ",
1066 (ireason
& IO
) ? "Write" : "Read");
1067 printk(KERN_ERR
"ide-tape: but the tape wants us to %s !\n",
1068 (ireason
& IO
) ? "Read" : "Write");
1069 return ide_do_reset(drive
);
1071 if (!(pc
->flags
& PC_FLAG_WRITING
)) {
1072 /* Reading - Check that we have enough space */
1073 temp
= pc
->xferred
+ bcount
;
1074 if (temp
> pc
->req_xfer
) {
1075 if (temp
> pc
->buf_size
) {
1076 printk(KERN_ERR
"ide-tape: The tape wants to "
1077 "send us more data than expected "
1078 "- discarding data\n");
1079 ide_atapi_discard_data(drive
, bcount
);
1080 ide_set_handler(drive
, &idetape_pc_intr
,
1081 IDETAPE_WAIT_CMD
, NULL
);
1084 debug_log(DBG_SENSE
, "The tape wants to send us more "
1085 "data than expected - allowing transfer\n");
1087 iobuf
= &idetape_input_buffers
;
1088 xferfunc
= hwif
->atapi_input_bytes
;
1090 iobuf
= &idetape_output_buffers
;
1091 xferfunc
= hwif
->atapi_output_bytes
;
1095 iobuf(drive
, pc
, bcount
);
1097 xferfunc(drive
, pc
->cur_pos
, bcount
);
1099 /* Update the current position */
1100 pc
->xferred
+= bcount
;
1101 pc
->cur_pos
+= bcount
;
1103 debug_log(DBG_SENSE
, "[cmd %x] transferred %d bytes on that intr.\n",
1106 /* And set the interrupt handler again */
1107 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1112 * Packet Command Interface
1114 * The current Packet Command is available in tape->pc, and will not change
1115 * until we finish handling it. Each packet command is associated with a
1116 * callback function that will be called when the command is finished.
1118 * The handling will be done in three stages:
1120 * 1. idetape_issue_pc will send the packet command to the drive, and will set
1121 * the interrupt handler to idetape_pc_intr.
1123 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
1124 * repeated until the device signals us that no more interrupts will be issued.
1126 * 3. ATAPI Tape media access commands have immediate status with a delayed
1127 * process. In case of a successful initiation of a media access packet command,
1128 * the DSC bit will be set when the actual execution of the command is finished.
1129 * Since the tape drive will not issue an interrupt, we have to poll for this
1130 * event. In this case, we define the request as "low priority request" by
1131 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
1134 * ide.c will then give higher priority to requests which originate from the
1135 * other device, until will change rq_status to RQ_ACTIVE.
1137 * 4. When the packet command is finished, it will be checked for errors.
1139 * 5. In case an error was found, we queue a request sense packet command in
1140 * front of the request queue and retry the operation up to
1141 * IDETAPE_MAX_PC_RETRIES times.
1143 * 6. In case no error was found, or we decided to give up and not to retry
1144 * again, the callback function will be called and then we will handle the next
1147 static ide_startstop_t
idetape_transfer_pc(ide_drive_t
*drive
)
1149 ide_hwif_t
*hwif
= drive
->hwif
;
1150 idetape_tape_t
*tape
= drive
->driver_data
;
1151 struct ide_atapi_pc
*pc
= tape
->pc
;
1153 ide_startstop_t startstop
;
1156 if (ide_wait_stat(&startstop
, drive
, DRQ_STAT
, BUSY_STAT
, WAIT_READY
)) {
1157 printk(KERN_ERR
"ide-tape: Strange, packet command initiated "
1158 "yet DRQ isn't asserted\n");
1161 ireason
= hwif
->INB(hwif
->io_ports
[IDE_IREASON_OFFSET
]);
1162 while (retries
-- && ((ireason
& CD
) == 0 || (ireason
& IO
))) {
1163 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while issuing "
1164 "a packet command, retrying\n");
1166 ireason
= hwif
->INB(hwif
->io_ports
[IDE_IREASON_OFFSET
]);
1168 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while "
1169 "issuing a packet command, ignoring\n");
1174 if ((ireason
& CD
) == 0 || (ireason
& IO
)) {
1175 printk(KERN_ERR
"ide-tape: (IO,CoD) != (0,1) while issuing "
1176 "a packet command\n");
1177 return ide_do_reset(drive
);
1179 /* Set the interrupt routine */
1180 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1181 #ifdef CONFIG_BLK_DEV_IDEDMA
1182 /* Begin DMA, if necessary */
1183 if (pc
->flags
& PC_FLAG_DMA_IN_PROGRESS
)
1184 hwif
->dma_ops
->dma_start(drive
);
1186 /* Send the actual packet */
1187 HWIF(drive
)->atapi_output_bytes(drive
, pc
->c
, 12);
1191 static ide_startstop_t
idetape_issue_pc(ide_drive_t
*drive
,
1192 struct ide_atapi_pc
*pc
)
1194 ide_hwif_t
*hwif
= drive
->hwif
;
1195 idetape_tape_t
*tape
= drive
->driver_data
;
1199 if (tape
->pc
->c
[0] == REQUEST_SENSE
&&
1200 pc
->c
[0] == REQUEST_SENSE
) {
1201 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
1202 "Two request sense in serial were issued\n");
1205 if (tape
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
1206 tape
->failed_pc
= pc
;
1207 /* Set the current packet command */
1210 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
1211 (pc
->flags
& PC_FLAG_ABORT
)) {
1213 * We will "abort" retrying a packet command in case legitimate
1214 * error code was received (crossing a filemark, or end of the
1215 * media, for example).
1217 if (!(pc
->flags
& PC_FLAG_ABORT
)) {
1218 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
1219 tape
->sense_key
== 2 && tape
->asc
== 4 &&
1220 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
1221 printk(KERN_ERR
"ide-tape: %s: I/O error, "
1222 "pc = %2x, key = %2x, "
1223 "asc = %2x, ascq = %2x\n",
1224 tape
->name
, pc
->c
[0],
1225 tape
->sense_key
, tape
->asc
,
1229 pc
->error
= IDETAPE_ERROR_GENERAL
;
1231 tape
->failed_pc
= NULL
;
1232 return pc
->idetape_callback(drive
);
1234 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
1237 /* We haven't transferred any data yet */
1239 pc
->cur_pos
= pc
->buf
;
1240 /* Request to transfer the entire buffer at once */
1241 bcount
= pc
->req_xfer
;
1243 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
1244 pc
->flags
&= ~PC_FLAG_DMA_ERROR
;
1245 printk(KERN_WARNING
"ide-tape: DMA disabled, "
1246 "reverting to PIO\n");
1249 if ((pc
->flags
& PC_FLAG_DMA_RECOMMENDED
) && drive
->using_dma
)
1250 dma_ok
= !hwif
->dma_ops
->dma_setup(drive
);
1252 ide_pktcmd_tf_load(drive
, IDE_TFLAG_NO_SELECT_MASK
|
1253 IDE_TFLAG_OUT_DEVICE
, bcount
, dma_ok
);
1256 /* Will begin DMA later */
1257 pc
->flags
|= PC_FLAG_DMA_IN_PROGRESS
;
1258 if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT
, &tape
->flags
)) {
1259 ide_execute_command(drive
, WIN_PACKETCMD
, &idetape_transfer_pc
,
1260 IDETAPE_WAIT_CMD
, NULL
);
1263 hwif
->OUTB(WIN_PACKETCMD
, hwif
->io_ports
[IDE_COMMAND_OFFSET
]);
1264 return idetape_transfer_pc(drive
);
1268 static ide_startstop_t
idetape_pc_callback(ide_drive_t
*drive
)
1270 idetape_tape_t
*tape
= drive
->driver_data
;
1272 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1274 idetape_end_request(drive
, tape
->pc
->error
? 0 : 1, 0);
1278 /* A mode sense command is used to "sense" tape parameters. */
1279 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc
*pc
, u8 page_code
)
1281 idetape_init_pc(pc
);
1282 pc
->c
[0] = MODE_SENSE
;
1283 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
1284 /* DBD = 1 - Don't return block descriptors */
1286 pc
->c
[2] = page_code
;
1288 * Changed pc->c[3] to 0 (255 will at best return unused info).
1290 * For SCSI this byte is defined as subpage instead of high byte
1291 * of length and some IDE drives seem to interpret it this way
1292 * and return an error when 255 is used.
1295 /* We will just discard data in that case */
1297 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
1299 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
1303 pc
->idetape_callback
= &idetape_pc_callback
;
1306 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
1308 idetape_tape_t
*tape
= drive
->driver_data
;
1309 struct ide_atapi_pc
*pc
= tape
->pc
;
1312 stat
= ide_read_status(drive
);
1314 if (stat
& SEEK_STAT
) {
1315 if (stat
& ERR_STAT
) {
1316 /* Error detected */
1317 if (pc
->c
[0] != TEST_UNIT_READY
)
1318 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
1320 /* Retry operation */
1321 return idetape_retry_pc(drive
);
1324 if (tape
->failed_pc
== pc
)
1325 tape
->failed_pc
= NULL
;
1327 pc
->error
= IDETAPE_ERROR_GENERAL
;
1328 tape
->failed_pc
= NULL
;
1330 return pc
->idetape_callback(drive
);
1333 static ide_startstop_t
idetape_rw_callback(ide_drive_t
*drive
)
1335 idetape_tape_t
*tape
= drive
->driver_data
;
1336 struct request
*rq
= HWGROUP(drive
)->rq
;
1337 int blocks
= tape
->pc
->xferred
/ tape
->blk_size
;
1339 tape
->avg_size
+= blocks
* tape
->blk_size
;
1340 tape
->insert_size
+= blocks
* tape
->blk_size
;
1341 if (tape
->insert_size
> 1024 * 1024)
1342 tape
->measure_insert_time
= 1;
1343 if (tape
->measure_insert_time
) {
1344 tape
->measure_insert_time
= 0;
1345 tape
->insert_time
= jiffies
;
1346 tape
->insert_size
= 0;
1348 if (time_after(jiffies
, tape
->insert_time
))
1349 tape
->insert_speed
= tape
->insert_size
/ 1024 * HZ
/
1350 (jiffies
- tape
->insert_time
);
1351 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
1352 tape
->avg_speed
= tape
->avg_size
* HZ
/
1353 (jiffies
- tape
->avg_time
) / 1024;
1355 tape
->avg_time
= jiffies
;
1357 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1359 tape
->first_frame
+= blocks
;
1360 rq
->current_nr_sectors
-= blocks
;
1362 if (!tape
->pc
->error
)
1363 idetape_end_request(drive
, 1, 0);
1365 idetape_end_request(drive
, tape
->pc
->error
, 0);
1369 static void idetape_create_read_cmd(idetape_tape_t
*tape
,
1370 struct ide_atapi_pc
*pc
,
1371 unsigned int length
, struct idetape_bh
*bh
)
1373 idetape_init_pc(pc
);
1375 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1377 pc
->idetape_callback
= &idetape_rw_callback
;
1379 atomic_set(&bh
->b_count
, 0);
1381 pc
->buf_size
= length
* tape
->blk_size
;
1382 pc
->req_xfer
= pc
->buf_size
;
1383 if (pc
->req_xfer
== tape
->stage_size
)
1384 pc
->flags
|= PC_FLAG_DMA_RECOMMENDED
;
1387 static void idetape_create_write_cmd(idetape_tape_t
*tape
,
1388 struct ide_atapi_pc
*pc
,
1389 unsigned int length
, struct idetape_bh
*bh
)
1391 idetape_init_pc(pc
);
1393 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
1395 pc
->idetape_callback
= &idetape_rw_callback
;
1396 pc
->flags
|= PC_FLAG_WRITING
;
1398 pc
->b_data
= bh
->b_data
;
1399 pc
->b_count
= atomic_read(&bh
->b_count
);
1401 pc
->buf_size
= length
* tape
->blk_size
;
1402 pc
->req_xfer
= pc
->buf_size
;
1403 if (pc
->req_xfer
== tape
->stage_size
)
1404 pc
->flags
|= PC_FLAG_DMA_RECOMMENDED
;
1407 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
1408 struct request
*rq
, sector_t block
)
1410 idetape_tape_t
*tape
= drive
->driver_data
;
1411 struct ide_atapi_pc
*pc
= NULL
;
1412 struct request
*postponed_rq
= tape
->postponed_rq
;
1415 debug_log(DBG_SENSE
, "sector: %ld, nr_sectors: %ld,"
1416 " current_nr_sectors: %d\n",
1417 rq
->sector
, rq
->nr_sectors
, rq
->current_nr_sectors
);
1419 if (!blk_special_request(rq
)) {
1420 /* We do not support buffer cache originated requests. */
1421 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
1422 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
1423 ide_end_request(drive
, 0, 0);
1427 /* Retry a failed packet command */
1428 if (tape
->failed_pc
&& tape
->pc
->c
[0] == REQUEST_SENSE
)
1429 return idetape_issue_pc(drive
, tape
->failed_pc
);
1431 if (postponed_rq
!= NULL
)
1432 if (rq
!= postponed_rq
) {
1433 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
1434 "Two DSC requests were queued\n");
1435 idetape_end_request(drive
, 0, 0);
1439 tape
->postponed_rq
= NULL
;
1442 * If the tape is still busy, postpone our request and service
1443 * the other device meanwhile.
1445 stat
= ide_read_status(drive
);
1447 if (!drive
->dsc_overlap
&& !(rq
->cmd
[0] & REQ_IDETAPE_PC2
))
1448 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
1450 if (drive
->post_reset
== 1) {
1451 set_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
);
1452 drive
->post_reset
= 0;
1455 if (time_after(jiffies
, tape
->insert_time
))
1456 tape
->insert_speed
= tape
->insert_size
/ 1024 * HZ
/
1457 (jiffies
- tape
->insert_time
);
1458 if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC
, &tape
->flags
) &&
1459 (stat
& SEEK_STAT
) == 0) {
1460 if (postponed_rq
== NULL
) {
1461 tape
->dsc_polling_start
= jiffies
;
1462 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
1463 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
1464 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
1465 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
1467 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1468 idetape_media_access_finished(drive
);
1471 return ide_do_reset(drive
);
1473 } else if (time_after(jiffies
,
1474 tape
->dsc_polling_start
+
1475 IDETAPE_DSC_MA_THRESHOLD
))
1476 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
1477 idetape_postpone_request(drive
);
1480 if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1481 tape
->postpone_cnt
= 0;
1482 pc
= idetape_next_pc_storage(drive
);
1483 idetape_create_read_cmd(tape
, pc
, rq
->current_nr_sectors
,
1484 (struct idetape_bh
*)rq
->special
);
1487 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1488 tape
->postpone_cnt
= 0;
1489 pc
= idetape_next_pc_storage(drive
);
1490 idetape_create_write_cmd(tape
, pc
, rq
->current_nr_sectors
,
1491 (struct idetape_bh
*)rq
->special
);
1494 if (rq
->cmd
[0] & REQ_IDETAPE_PC1
) {
1495 pc
= (struct ide_atapi_pc
*) rq
->buffer
;
1496 rq
->cmd
[0] &= ~(REQ_IDETAPE_PC1
);
1497 rq
->cmd
[0] |= REQ_IDETAPE_PC2
;
1500 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
1501 idetape_media_access_finished(drive
);
1506 return idetape_issue_pc(drive
, pc
);
1509 /* Pipeline related functions */
1512 * The function below uses __get_free_page to allocate a pipeline stage, along
1513 * with all the necessary small buffers which together make a buffer of size
1514 * tape->stage_size (or a bit more). We attempt to combine sequential pages as
1517 * It returns a pointer to the new allocated stage, or NULL if we can't (or
1518 * don't want to) allocate a stage.
1520 * Pipeline stages are optional and are used to increase performance. If we
1521 * can't allocate them, we'll manage without them.
1523 static idetape_stage_t
*__idetape_kmalloc_stage(idetape_tape_t
*tape
, int full
,
1526 idetape_stage_t
*stage
;
1527 struct idetape_bh
*prev_bh
, *bh
;
1528 int pages
= tape
->pages_per_stage
;
1529 char *b_data
= NULL
;
1531 stage
= kmalloc(sizeof(idetape_stage_t
), GFP_KERNEL
);
1536 stage
->bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1540 bh
->b_reqnext
= NULL
;
1541 bh
->b_data
= (char *) __get_free_page(GFP_KERNEL
);
1545 memset(bh
->b_data
, 0, PAGE_SIZE
);
1546 bh
->b_size
= PAGE_SIZE
;
1547 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1550 b_data
= (char *) __get_free_page(GFP_KERNEL
);
1554 memset(b_data
, 0, PAGE_SIZE
);
1555 if (bh
->b_data
== b_data
+ PAGE_SIZE
) {
1556 bh
->b_size
+= PAGE_SIZE
;
1557 bh
->b_data
-= PAGE_SIZE
;
1559 atomic_add(PAGE_SIZE
, &bh
->b_count
);
1562 if (b_data
== bh
->b_data
+ bh
->b_size
) {
1563 bh
->b_size
+= PAGE_SIZE
;
1565 atomic_add(PAGE_SIZE
, &bh
->b_count
);
1569 bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
1571 free_page((unsigned long) b_data
);
1574 bh
->b_reqnext
= NULL
;
1575 bh
->b_data
= b_data
;
1576 bh
->b_size
= PAGE_SIZE
;
1577 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
1578 prev_bh
->b_reqnext
= bh
;
1580 bh
->b_size
-= tape
->excess_bh_size
;
1582 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
1585 __idetape_kfree_stage(stage
);
1589 static int idetape_copy_stage_from_user(idetape_tape_t
*tape
,
1590 const char __user
*buf
, int n
)
1592 struct idetape_bh
*bh
= tape
->bh
;
1598 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1602 count
= min((unsigned int)
1603 (bh
->b_size
- atomic_read(&bh
->b_count
)),
1605 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
,
1609 atomic_add(count
, &bh
->b_count
);
1611 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
1614 atomic_set(&bh
->b_count
, 0);
1621 static int idetape_copy_stage_to_user(idetape_tape_t
*tape
, char __user
*buf
,
1624 struct idetape_bh
*bh
= tape
->bh
;
1630 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1634 count
= min(tape
->b_count
, n
);
1635 if (copy_to_user(buf
, tape
->b_data
, count
))
1638 tape
->b_data
+= count
;
1639 tape
->b_count
-= count
;
1641 if (!tape
->b_count
) {
1645 tape
->b_data
= bh
->b_data
;
1646 tape
->b_count
= atomic_read(&bh
->b_count
);
1653 static void idetape_init_merge_stage(idetape_tape_t
*tape
)
1655 struct idetape_bh
*bh
= tape
->merge_stage
->bh
;
1658 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1659 atomic_set(&bh
->b_count
, 0);
1661 tape
->b_data
= bh
->b_data
;
1662 tape
->b_count
= atomic_read(&bh
->b_count
);
1666 /* Install a completion in a pending request and sleep until it is serviced. The
1667 * caller should ensure that the request will not be serviced before we install
1668 * the completion (usually by disabling interrupts).
1670 static void idetape_wait_for_request(ide_drive_t
*drive
, struct request
*rq
)
1672 DECLARE_COMPLETION_ONSTACK(wait
);
1673 idetape_tape_t
*tape
= drive
->driver_data
;
1675 if (rq
== NULL
|| !blk_special_request(rq
)) {
1676 printk(KERN_ERR
"ide-tape: bug: Trying to sleep on non-valid"
1680 rq
->end_io_data
= &wait
;
1681 rq
->end_io
= blk_end_sync_rq
;
1682 spin_unlock_irq(&tape
->lock
);
1683 wait_for_completion(&wait
);
1684 /* The stage and its struct request have been deallocated */
1685 spin_lock_irq(&tape
->lock
);
1688 static ide_startstop_t
idetape_read_position_callback(ide_drive_t
*drive
)
1690 idetape_tape_t
*tape
= drive
->driver_data
;
1691 u8
*readpos
= tape
->pc
->buf
;
1693 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1695 if (!tape
->pc
->error
) {
1696 debug_log(DBG_SENSE
, "BOP - %s\n",
1697 (readpos
[0] & 0x80) ? "Yes" : "No");
1698 debug_log(DBG_SENSE
, "EOP - %s\n",
1699 (readpos
[0] & 0x40) ? "Yes" : "No");
1701 if (readpos
[0] & 0x4) {
1702 printk(KERN_INFO
"ide-tape: Block location is unknown"
1704 clear_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
);
1705 idetape_end_request(drive
, 0, 0);
1707 debug_log(DBG_SENSE
, "Block Location - %u\n",
1708 be32_to_cpu(*(u32
*)&readpos
[4]));
1710 tape
->partition
= readpos
[1];
1712 be32_to_cpu(*(u32
*)&readpos
[4]);
1713 set_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
);
1714 idetape_end_request(drive
, 1, 0);
1717 idetape_end_request(drive
, 0, 0);
1723 * Write a filemark if write_filemark=1. Flush the device buffers without
1724 * writing a filemark otherwise.
1726 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
1727 struct ide_atapi_pc
*pc
, int write_filemark
)
1729 idetape_init_pc(pc
);
1730 pc
->c
[0] = WRITE_FILEMARKS
;
1731 pc
->c
[4] = write_filemark
;
1732 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1733 pc
->idetape_callback
= &idetape_pc_callback
;
1736 static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc
*pc
)
1738 idetape_init_pc(pc
);
1739 pc
->c
[0] = TEST_UNIT_READY
;
1740 pc
->idetape_callback
= &idetape_pc_callback
;
1744 * We add a special packet command request to the tail of the request queue, and
1745 * wait for it to be serviced. This is not to be called from within the request
1746 * handling part of the driver! We allocate here data on the stack and it is
1747 * valid until the request is finished. This is not the case for the bottom part
1748 * of the driver, where we are always leaving the functions to wait for an
1749 * interrupt or a timer event.
1751 * From the bottom part of the driver, we should allocate safe memory using
1752 * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request
1753 * to the request list without waiting for it to be serviced! In that case, we
1754 * usually use idetape_queue_pc_head().
1756 static int __idetape_queue_pc_tail(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
)
1758 struct ide_tape_obj
*tape
= drive
->driver_data
;
1761 idetape_init_rq(&rq
, REQ_IDETAPE_PC1
);
1762 rq
.buffer
= (char *) pc
;
1763 rq
.rq_disk
= tape
->disk
;
1764 return ide_do_drive_cmd(drive
, &rq
, ide_wait
);
1767 static void idetape_create_load_unload_cmd(ide_drive_t
*drive
,
1768 struct ide_atapi_pc
*pc
, int cmd
)
1770 idetape_init_pc(pc
);
1771 pc
->c
[0] = START_STOP
;
1773 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1774 pc
->idetape_callback
= &idetape_pc_callback
;
1777 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
1779 idetape_tape_t
*tape
= drive
->driver_data
;
1780 struct ide_atapi_pc pc
;
1781 int load_attempted
= 0;
1783 /* Wait for the tape to become ready */
1784 set_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
);
1786 while (time_before(jiffies
, timeout
)) {
1787 idetape_create_test_unit_ready_cmd(&pc
);
1788 if (!__idetape_queue_pc_tail(drive
, &pc
))
1790 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
1791 || (tape
->asc
== 0x3A)) {
1795 idetape_create_load_unload_cmd(drive
, &pc
,
1796 IDETAPE_LU_LOAD_MASK
);
1797 __idetape_queue_pc_tail(drive
, &pc
);
1799 /* not about to be ready */
1800 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
1801 (tape
->ascq
== 1 || tape
->ascq
== 8)))
1808 static int idetape_queue_pc_tail(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
)
1810 return __idetape_queue_pc_tail(drive
, pc
);
1813 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
1815 struct ide_atapi_pc pc
;
1818 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
1819 rc
= idetape_queue_pc_tail(drive
, &pc
);
1822 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1826 static void idetape_create_read_position_cmd(struct ide_atapi_pc
*pc
)
1828 idetape_init_pc(pc
);
1829 pc
->c
[0] = READ_POSITION
;
1831 pc
->idetape_callback
= &idetape_read_position_callback
;
1834 static int idetape_read_position(ide_drive_t
*drive
)
1836 idetape_tape_t
*tape
= drive
->driver_data
;
1837 struct ide_atapi_pc pc
;
1840 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1842 idetape_create_read_position_cmd(&pc
);
1843 if (idetape_queue_pc_tail(drive
, &pc
))
1845 position
= tape
->first_frame
;
1849 static void idetape_create_locate_cmd(ide_drive_t
*drive
,
1850 struct ide_atapi_pc
*pc
,
1851 unsigned int block
, u8 partition
, int skip
)
1853 idetape_init_pc(pc
);
1854 pc
->c
[0] = POSITION_TO_ELEMENT
;
1856 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
1857 pc
->c
[8] = partition
;
1858 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1859 pc
->idetape_callback
= &idetape_pc_callback
;
1862 static int idetape_create_prevent_cmd(ide_drive_t
*drive
,
1863 struct ide_atapi_pc
*pc
, int prevent
)
1865 idetape_tape_t
*tape
= drive
->driver_data
;
1867 /* device supports locking according to capabilities page */
1868 if (!(tape
->caps
[6] & 0x01))
1871 idetape_init_pc(pc
);
1872 pc
->c
[0] = ALLOW_MEDIUM_REMOVAL
;
1874 pc
->idetape_callback
= &idetape_pc_callback
;
1878 static int __idetape_discard_read_pipeline(ide_drive_t
*drive
)
1880 idetape_tape_t
*tape
= drive
->driver_data
;
1881 unsigned long flags
;
1884 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
1887 /* Remove merge stage. */
1888 cnt
= tape
->merge_stage_size
/ tape
->blk_size
;
1889 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
))
1890 ++cnt
; /* Filemarks count as 1 sector */
1891 tape
->merge_stage_size
= 0;
1892 if (tape
->merge_stage
!= NULL
) {
1893 __idetape_kfree_stage(tape
->merge_stage
);
1894 tape
->merge_stage
= NULL
;
1897 /* Clear pipeline flags. */
1898 clear_bit(IDETAPE_FLAG_PIPELINE_ERR
, &tape
->flags
);
1899 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1901 /* Remove pipeline stages. */
1902 if (tape
->first_stage
== NULL
)
1905 spin_lock_irqsave(&tape
->lock
, flags
);
1906 tape
->next_stage
= NULL
;
1907 if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE
, &tape
->flags
))
1908 idetape_wait_for_request(drive
, tape
->active_data_rq
);
1909 spin_unlock_irqrestore(&tape
->lock
, flags
);
1911 while (tape
->first_stage
!= NULL
) {
1912 struct request
*rq_ptr
= &tape
->first_stage
->rq
;
1914 cnt
+= rq_ptr
->nr_sectors
- rq_ptr
->current_nr_sectors
;
1915 if (rq_ptr
->errors
== IDETAPE_ERROR_FILEMARK
)
1917 idetape_remove_stage_head(drive
);
1919 tape
->nr_pending_stages
= 0;
1920 tape
->max_stages
= tape
->min_pipeline
;
1925 * Position the tape to the requested block using the LOCATE packet command.
1926 * A READ POSITION command is then issued to check where we are positioned. Like
1927 * all higher level operations, we queue the commands at the tail of the request
1928 * queue and wait for their completion.
1930 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
1931 u8 partition
, int skip
)
1933 idetape_tape_t
*tape
= drive
->driver_data
;
1935 struct ide_atapi_pc pc
;
1937 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1938 __idetape_discard_read_pipeline(drive
);
1939 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1940 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
1941 retval
= idetape_queue_pc_tail(drive
, &pc
);
1945 idetape_create_read_position_cmd(&pc
);
1946 return (idetape_queue_pc_tail(drive
, &pc
));
1949 static void idetape_discard_read_pipeline(ide_drive_t
*drive
,
1950 int restore_position
)
1952 idetape_tape_t
*tape
= drive
->driver_data
;
1956 cnt
= __idetape_discard_read_pipeline(drive
);
1957 if (restore_position
) {
1958 position
= idetape_read_position(drive
);
1959 seek
= position
> cnt
? position
- cnt
: 0;
1960 if (idetape_position_tape(drive
, seek
, 0, 0)) {
1961 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
1962 " discard_pipeline()\n", tape
->name
);
1969 * Generate a read/write request for the block device interface and wait for it
1972 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
,
1973 struct idetape_bh
*bh
)
1975 idetape_tape_t
*tape
= drive
->driver_data
;
1978 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
1980 if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE
, &tape
->flags
)) {
1981 printk(KERN_ERR
"ide-tape: bug: the pipeline is active in %s\n",
1986 idetape_init_rq(&rq
, cmd
);
1987 rq
.rq_disk
= tape
->disk
;
1988 rq
.special
= (void *)bh
;
1989 rq
.sector
= tape
->first_frame
;
1990 rq
.nr_sectors
= blocks
;
1991 rq
.current_nr_sectors
= blocks
;
1992 (void) ide_do_drive_cmd(drive
, &rq
, ide_wait
);
1994 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
1997 if (tape
->merge_stage
)
1998 idetape_init_merge_stage(tape
);
1999 if (rq
.errors
== IDETAPE_ERROR_GENERAL
)
2001 return (tape
->blk_size
* (blocks
-rq
.current_nr_sectors
));
2004 /* start servicing the pipeline stages, starting from tape->next_stage. */
2005 static void idetape_plug_pipeline(ide_drive_t
*drive
)
2007 idetape_tape_t
*tape
= drive
->driver_data
;
2009 if (tape
->next_stage
== NULL
)
2011 if (!test_and_set_bit(IDETAPE_FLAG_PIPELINE_ACTIVE
, &tape
->flags
)) {
2012 idetape_activate_next_stage(drive
);
2013 (void) ide_do_drive_cmd(drive
, tape
->active_data_rq
, ide_end
);
2017 static void idetape_create_inquiry_cmd(struct ide_atapi_pc
*pc
)
2019 idetape_init_pc(pc
);
2023 pc
->idetape_callback
= &idetape_pc_callback
;
2026 static void idetape_create_rewind_cmd(ide_drive_t
*drive
,
2027 struct ide_atapi_pc
*pc
)
2029 idetape_init_pc(pc
);
2030 pc
->c
[0] = REZERO_UNIT
;
2031 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
2032 pc
->idetape_callback
= &idetape_pc_callback
;
2035 static void idetape_create_erase_cmd(struct ide_atapi_pc
*pc
)
2037 idetape_init_pc(pc
);
2040 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
2041 pc
->idetape_callback
= &idetape_pc_callback
;
2044 static void idetape_create_space_cmd(struct ide_atapi_pc
*pc
, int count
, u8 cmd
)
2046 idetape_init_pc(pc
);
2048 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
2050 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
2051 pc
->idetape_callback
= &idetape_pc_callback
;
2054 /* Queue up a character device originated write request. */
2055 static int idetape_add_chrdev_write_request(ide_drive_t
*drive
, int blocks
)
2057 idetape_tape_t
*tape
= drive
->driver_data
;
2058 unsigned long flags
;
2060 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2062 /* Attempt to allocate a new stage. Beware possible race conditions. */
2064 spin_lock_irqsave(&tape
->lock
, flags
);
2065 if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE
, &tape
->flags
)) {
2066 idetape_wait_for_request(drive
, tape
->active_data_rq
);
2067 spin_unlock_irqrestore(&tape
->lock
, flags
);
2069 spin_unlock_irqrestore(&tape
->lock
, flags
);
2070 idetape_plug_pipeline(drive
);
2071 if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE
,
2074 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
2075 blocks
, tape
->merge_stage
->bh
);
2081 * Wait until all pending pipeline requests are serviced. Typically called on
2084 static void idetape_wait_for_pipeline(ide_drive_t
*drive
)
2086 idetape_tape_t
*tape
= drive
->driver_data
;
2087 unsigned long flags
;
2089 while (tape
->next_stage
|| test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE
,
2091 idetape_plug_pipeline(drive
);
2092 spin_lock_irqsave(&tape
->lock
, flags
);
2093 if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE
, &tape
->flags
))
2094 idetape_wait_for_request(drive
, tape
->active_data_rq
);
2095 spin_unlock_irqrestore(&tape
->lock
, flags
);
2099 static void idetape_empty_write_pipeline(ide_drive_t
*drive
)
2101 idetape_tape_t
*tape
= drive
->driver_data
;
2103 struct idetape_bh
*bh
;
2105 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
2106 printk(KERN_ERR
"ide-tape: bug: Trying to empty write pipeline,"
2107 " but we are not writing.\n");
2110 if (tape
->merge_stage_size
> tape
->stage_size
) {
2111 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
2112 tape
->merge_stage_size
= tape
->stage_size
;
2114 if (tape
->merge_stage_size
) {
2115 blocks
= tape
->merge_stage_size
/ tape
->blk_size
;
2116 if (tape
->merge_stage_size
% tape
->blk_size
) {
2120 i
= tape
->blk_size
- tape
->merge_stage_size
%
2122 bh
= tape
->bh
->b_reqnext
;
2124 atomic_set(&bh
->b_count
, 0);
2130 printk(KERN_INFO
"ide-tape: bug,"
2134 min
= min(i
, (unsigned int)(bh
->b_size
-
2135 atomic_read(&bh
->b_count
)));
2136 memset(bh
->b_data
+ atomic_read(&bh
->b_count
),
2138 atomic_add(min
, &bh
->b_count
);
2143 (void) idetape_add_chrdev_write_request(drive
, blocks
);
2144 tape
->merge_stage_size
= 0;
2146 idetape_wait_for_pipeline(drive
);
2147 if (tape
->merge_stage
!= NULL
) {
2148 __idetape_kfree_stage(tape
->merge_stage
);
2149 tape
->merge_stage
= NULL
;
2151 clear_bit(IDETAPE_FLAG_PIPELINE_ERR
, &tape
->flags
);
2152 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2155 * On the next backup, perform the feedback loop again. (I don't want to
2156 * keep sense information between backups, as some systems are
2157 * constantly on, and the system load can be totally different on the
2160 tape
->max_stages
= tape
->min_pipeline
;
2161 if (tape
->first_stage
!= NULL
||
2162 tape
->next_stage
!= NULL
||
2163 tape
->last_stage
!= NULL
||
2164 tape
->nr_stages
!= 0) {
2165 printk(KERN_ERR
"ide-tape: ide-tape pipeline bug, "
2166 "first_stage %p, next_stage %p, "
2167 "last_stage %p, nr_stages %d\n",
2168 tape
->first_stage
, tape
->next_stage
,
2169 tape
->last_stage
, tape
->nr_stages
);
2173 static int idetape_init_read(ide_drive_t
*drive
, int max_stages
)
2175 idetape_tape_t
*tape
= drive
->driver_data
;
2178 /* Initialize read operation */
2179 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
2180 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
2181 idetape_empty_write_pipeline(drive
);
2182 idetape_flush_tape_buffers(drive
);
2184 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
2185 printk(KERN_ERR
"ide-tape: merge_stage_size should be"
2187 tape
->merge_stage_size
= 0;
2189 tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 0, 0);
2190 if (!tape
->merge_stage
)
2192 tape
->chrdev_dir
= IDETAPE_DIR_READ
;
2195 * Issue a read 0 command to ensure that DSC handshake is
2196 * switched from completion mode to buffer available mode.
2197 * No point in issuing this if DSC overlap isn't supported, some
2198 * drives (Seagate STT3401A) will return an error.
2200 if (drive
->dsc_overlap
) {
2201 bytes_read
= idetape_queue_rw_tail(drive
,
2202 REQ_IDETAPE_READ
, 0,
2203 tape
->merge_stage
->bh
);
2204 if (bytes_read
< 0) {
2205 __idetape_kfree_stage(tape
->merge_stage
);
2206 tape
->merge_stage
= NULL
;
2207 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2213 if (!test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE
, &tape
->flags
)) {
2214 if (tape
->nr_pending_stages
>= 3 * max_stages
/ 4) {
2215 tape
->measure_insert_time
= 1;
2216 tape
->insert_time
= jiffies
;
2217 tape
->insert_size
= 0;
2218 tape
->insert_speed
= 0;
2219 idetape_plug_pipeline(drive
);
2226 * Called from idetape_chrdev_read() to service a character device read request
2227 * and add read-ahead requests to our pipeline.
2229 static int idetape_add_chrdev_read_request(ide_drive_t
*drive
, int blocks
)
2231 idetape_tape_t
*tape
= drive
->driver_data
;
2233 debug_log(DBG_PROCS
, "Enter %s, %d blocks\n", __func__
, blocks
);
2235 /* If we are at a filemark, return a read length of 0 */
2236 if (test_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
))
2239 idetape_init_read(drive
, tape
->max_stages
);
2241 if (test_bit(IDETAPE_FLAG_PIPELINE_ERR
, &tape
->flags
))
2244 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
,
2245 tape
->merge_stage
->bh
);
2248 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
2250 idetape_tape_t
*tape
= drive
->driver_data
;
2251 struct idetape_bh
*bh
;
2257 bh
= tape
->merge_stage
->bh
;
2258 count
= min(tape
->stage_size
, bcount
);
2260 blocks
= count
/ tape
->blk_size
;
2262 atomic_set(&bh
->b_count
,
2263 min(count
, (unsigned int)bh
->b_size
));
2264 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
2265 count
-= atomic_read(&bh
->b_count
);
2268 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
,
2269 tape
->merge_stage
->bh
);
2274 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
2275 * currently support only one partition.
2277 static int idetape_rewind_tape(ide_drive_t
*drive
)
2280 struct ide_atapi_pc pc
;
2281 idetape_tape_t
*tape
;
2282 tape
= drive
->driver_data
;
2284 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
2286 idetape_create_rewind_cmd(drive
, &pc
);
2287 retval
= idetape_queue_pc_tail(drive
, &pc
);
2291 idetape_create_read_position_cmd(&pc
);
2292 retval
= idetape_queue_pc_tail(drive
, &pc
);
2298 /* mtio.h compatible commands should be issued to the chrdev interface. */
2299 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
2302 idetape_tape_t
*tape
= drive
->driver_data
;
2303 void __user
*argp
= (void __user
*)arg
;
2305 struct idetape_config
{
2306 int dsc_rw_frequency
;
2307 int dsc_media_access_frequency
;
2311 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
2315 if (copy_from_user(&config
, argp
, sizeof(config
)))
2317 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
2318 tape
->max_stages
= config
.nr_stages
;
2321 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
2322 config
.nr_stages
= tape
->max_stages
;
2323 if (copy_to_user(argp
, &config
, sizeof(config
)))
2332 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
2335 idetape_tape_t
*tape
= drive
->driver_data
;
2336 struct ide_atapi_pc pc
;
2337 int retval
, count
= 0;
2338 int sprev
= !!(tape
->caps
[4] & 0x20);
2342 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
2345 mt_count
= -mt_count
;
2348 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
2349 tape
->merge_stage_size
= 0;
2350 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
))
2352 idetape_discard_read_pipeline(drive
, 0);
2356 * The filemark was not found in our internal pipeline; now we can issue
2357 * the space command.
2362 idetape_create_space_cmd(&pc
, mt_count
- count
,
2363 IDETAPE_SPACE_OVER_FILEMARK
);
2364 return idetape_queue_pc_tail(drive
, &pc
);
2369 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
2373 count
= (MTBSFM
== mt_op
? 1 : -1);
2374 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
2376 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
2383 * Our character device read / write functions.
2385 * The tape is optimized to maximize throughput when it is transferring an
2386 * integral number of the "continuous transfer limit", which is a parameter of
2387 * the specific tape (26kB on my particular tape, 32kB for Onstream).
2389 * As of version 1.3 of the driver, the character device provides an abstract
2390 * continuous view of the media - any mix of block sizes (even 1 byte) on the
2391 * same backup/restore procedure is supported. The driver will internally
2392 * convert the requests to the recommended transfer unit, so that an unmatch
2393 * between the user's block size to the recommended size will only result in a
2394 * (slightly) increased driver overhead, but will no longer hit performance.
2395 * This is not applicable to Onstream.
2397 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
2398 size_t count
, loff_t
*ppos
)
2400 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2401 ide_drive_t
*drive
= tape
->drive
;
2402 ssize_t bytes_read
, temp
, actually_read
= 0, rc
;
2404 u16 ctl
= *(u16
*)&tape
->caps
[12];
2406 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
2408 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
2409 if (test_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
))
2410 if (count
> tape
->blk_size
&&
2411 (count
% tape
->blk_size
) == 0)
2412 tape
->user_bs_factor
= count
/ tape
->blk_size
;
2414 rc
= idetape_init_read(drive
, tape
->max_stages
);
2419 if (tape
->merge_stage_size
) {
2420 actually_read
= min((unsigned int)(tape
->merge_stage_size
),
2421 (unsigned int)count
);
2422 if (idetape_copy_stage_to_user(tape
, buf
, actually_read
))
2424 buf
+= actually_read
;
2425 tape
->merge_stage_size
-= actually_read
;
2426 count
-= actually_read
;
2428 while (count
>= tape
->stage_size
) {
2429 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
2430 if (bytes_read
<= 0)
2432 if (idetape_copy_stage_to_user(tape
, buf
, bytes_read
))
2435 count
-= bytes_read
;
2436 actually_read
+= bytes_read
;
2439 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
2440 if (bytes_read
<= 0)
2442 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
2443 if (idetape_copy_stage_to_user(tape
, buf
, temp
))
2445 actually_read
+= temp
;
2446 tape
->merge_stage_size
= bytes_read
-temp
;
2449 if (!actually_read
&& test_bit(IDETAPE_FLAG_FILEMARK
, &tape
->flags
)) {
2450 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
2452 idetape_space_over_filemarks(drive
, MTFSF
, 1);
2456 return ret
? ret
: actually_read
;
2459 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
2460 size_t count
, loff_t
*ppos
)
2462 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2463 ide_drive_t
*drive
= tape
->drive
;
2464 ssize_t actually_written
= 0;
2466 u16 ctl
= *(u16
*)&tape
->caps
[12];
2468 /* The drive is write protected. */
2469 if (tape
->write_prot
)
2472 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
2474 /* Initialize write operation */
2475 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
2476 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
2477 idetape_discard_read_pipeline(drive
, 1);
2478 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
2479 printk(KERN_ERR
"ide-tape: merge_stage_size "
2480 "should be 0 now\n");
2481 tape
->merge_stage_size
= 0;
2483 tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 0, 0);
2484 if (!tape
->merge_stage
)
2486 tape
->chrdev_dir
= IDETAPE_DIR_WRITE
;
2487 idetape_init_merge_stage(tape
);
2490 * Issue a write 0 command to ensure that DSC handshake is
2491 * switched from completion mode to buffer available mode. No
2492 * point in issuing this if DSC overlap isn't supported, some
2493 * drives (Seagate STT3401A) will return an error.
2495 if (drive
->dsc_overlap
) {
2496 ssize_t retval
= idetape_queue_rw_tail(drive
,
2497 REQ_IDETAPE_WRITE
, 0,
2498 tape
->merge_stage
->bh
);
2500 __idetape_kfree_stage(tape
->merge_stage
);
2501 tape
->merge_stage
= NULL
;
2502 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2509 if (tape
->merge_stage_size
) {
2510 if (tape
->merge_stage_size
>= tape
->stage_size
) {
2511 printk(KERN_ERR
"ide-tape: bug: merge buf too big\n");
2512 tape
->merge_stage_size
= 0;
2514 actually_written
= min((unsigned int)
2515 (tape
->stage_size
- tape
->merge_stage_size
),
2516 (unsigned int)count
);
2517 if (idetape_copy_stage_from_user(tape
, buf
, actually_written
))
2519 buf
+= actually_written
;
2520 tape
->merge_stage_size
+= actually_written
;
2521 count
-= actually_written
;
2523 if (tape
->merge_stage_size
== tape
->stage_size
) {
2525 tape
->merge_stage_size
= 0;
2526 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
2531 while (count
>= tape
->stage_size
) {
2533 if (idetape_copy_stage_from_user(tape
, buf
, tape
->stage_size
))
2535 buf
+= tape
->stage_size
;
2536 count
-= tape
->stage_size
;
2537 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
2538 actually_written
+= tape
->stage_size
;
2543 actually_written
+= count
;
2544 if (idetape_copy_stage_from_user(tape
, buf
, count
))
2546 tape
->merge_stage_size
+= count
;
2548 return ret
? ret
: actually_written
;
2551 static int idetape_write_filemark(ide_drive_t
*drive
)
2553 struct ide_atapi_pc pc
;
2555 /* Write a filemark */
2556 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
2557 if (idetape_queue_pc_tail(drive
, &pc
)) {
2558 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
2565 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
2568 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
2569 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
2570 * usually not supported (it is supported in the rare case in which we crossed
2571 * the filemark during our read-ahead pipelined operation mode).
2573 * The following commands are currently not supported:
2575 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
2576 * MT_ST_WRITE_THRESHOLD.
2578 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
2580 idetape_tape_t
*tape
= drive
->driver_data
;
2581 struct ide_atapi_pc pc
;
2584 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
2587 /* Commands which need our pipelined read-ahead stages. */
2595 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
2602 if (tape
->write_prot
)
2604 idetape_discard_read_pipeline(drive
, 1);
2605 for (i
= 0; i
< mt_count
; i
++) {
2606 retval
= idetape_write_filemark(drive
);
2612 idetape_discard_read_pipeline(drive
, 0);
2613 if (idetape_rewind_tape(drive
))
2617 idetape_discard_read_pipeline(drive
, 0);
2618 idetape_create_load_unload_cmd(drive
, &pc
,
2619 IDETAPE_LU_LOAD_MASK
);
2620 return idetape_queue_pc_tail(drive
, &pc
);
2624 * If door is locked, attempt to unlock before
2625 * attempting to eject.
2627 if (tape
->door_locked
) {
2628 if (idetape_create_prevent_cmd(drive
, &pc
, 0))
2629 if (!idetape_queue_pc_tail(drive
, &pc
))
2630 tape
->door_locked
= DOOR_UNLOCKED
;
2632 idetape_discard_read_pipeline(drive
, 0);
2633 idetape_create_load_unload_cmd(drive
, &pc
,
2634 !IDETAPE_LU_LOAD_MASK
);
2635 retval
= idetape_queue_pc_tail(drive
, &pc
);
2637 clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
);
2640 idetape_discard_read_pipeline(drive
, 0);
2641 return idetape_flush_tape_buffers(drive
);
2643 idetape_discard_read_pipeline(drive
, 0);
2644 idetape_create_load_unload_cmd(drive
, &pc
,
2645 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
2646 return idetape_queue_pc_tail(drive
, &pc
);
2648 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
2649 return idetape_queue_pc_tail(drive
, &pc
);
2651 (void)idetape_rewind_tape(drive
);
2652 idetape_create_erase_cmd(&pc
);
2653 return idetape_queue_pc_tail(drive
, &pc
);
2656 if (mt_count
< tape
->blk_size
||
2657 mt_count
% tape
->blk_size
)
2659 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
2660 clear_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
);
2662 set_bit(IDETAPE_FLAG_DETECT_BS
, &tape
->flags
);
2665 idetape_discard_read_pipeline(drive
, 0);
2666 return idetape_position_tape(drive
,
2667 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
2669 idetape_discard_read_pipeline(drive
, 0);
2670 return idetape_position_tape(drive
, 0, mt_count
, 0);
2674 if (!idetape_create_prevent_cmd(drive
, &pc
, 1))
2676 retval
= idetape_queue_pc_tail(drive
, &pc
);
2679 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
2682 if (!idetape_create_prevent_cmd(drive
, &pc
, 0))
2684 retval
= idetape_queue_pc_tail(drive
, &pc
);
2687 tape
->door_locked
= DOOR_UNLOCKED
;
2690 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
2697 * Our character device ioctls. General mtio.h magnetic io commands are
2698 * supported here, and not in the corresponding block interface. Our own
2699 * ide-tape ioctls are supported on both interfaces.
2701 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
2702 unsigned int cmd
, unsigned long arg
)
2704 struct ide_tape_obj
*tape
= ide_tape_f(file
);
2705 ide_drive_t
*drive
= tape
->drive
;
2709 int block_offset
= 0, position
= tape
->first_frame
;
2710 void __user
*argp
= (void __user
*)arg
;
2712 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
2714 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
2715 idetape_empty_write_pipeline(drive
);
2716 idetape_flush_tape_buffers(drive
);
2718 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
2719 idetape_wait_for_pipeline(drive
);
2720 block_offset
= tape
->merge_stage_size
/
2721 (tape
->blk_size
* tape
->user_bs_factor
);
2722 position
= idetape_read_position(drive
);
2728 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
2730 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
2732 memset(&mtget
, 0, sizeof(struct mtget
));
2733 mtget
.mt_type
= MT_ISSCSI2
;
2734 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
2736 ((tape
->blk_size
* tape
->user_bs_factor
)
2737 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
2739 if (tape
->drv_write_prot
)
2740 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
2742 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
2746 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
2747 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
2751 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
2752 idetape_discard_read_pipeline(drive
, 1);
2753 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
2758 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
2759 * block size with the reported value.
2761 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
2763 idetape_tape_t
*tape
= drive
->driver_data
;
2764 struct ide_atapi_pc pc
;
2766 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
2767 if (idetape_queue_pc_tail(drive
, &pc
)) {
2768 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
2769 if (tape
->blk_size
== 0) {
2770 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
2771 "block size, assuming 32k\n");
2772 tape
->blk_size
= 32768;
2776 tape
->blk_size
= (pc
.buf
[4 + 5] << 16) +
2777 (pc
.buf
[4 + 6] << 8) +
2779 tape
->drv_write_prot
= (pc
.buf
[2] & 0x80) >> 7;
2782 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
2784 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
2786 idetape_tape_t
*tape
;
2787 struct ide_atapi_pc pc
;
2790 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
2793 tape
= ide_tape_chrdev_get(i
);
2797 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2800 * We really want to do nonseekable_open(inode, filp); here, but some
2801 * versions of tar incorrectly call lseek on tapes and bail out if that
2802 * fails. So we disallow pread() and pwrite(), but permit lseeks.
2804 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
2806 drive
= tape
->drive
;
2808 filp
->private_data
= tape
;
2810 if (test_and_set_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
)) {
2815 retval
= idetape_wait_ready(drive
, 60 * HZ
);
2817 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2818 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
2822 idetape_read_position(drive
);
2823 if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID
, &tape
->flags
))
2824 (void)idetape_rewind_tape(drive
);
2826 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
2827 clear_bit(IDETAPE_FLAG_PIPELINE_ERR
, &tape
->flags
);
2829 /* Read block size and write protect status from drive. */
2830 ide_tape_get_bsize_from_bdesc(drive
);
2832 /* Set write protect flag if device is opened as read-only. */
2833 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
2834 tape
->write_prot
= 1;
2836 tape
->write_prot
= tape
->drv_write_prot
;
2838 /* Make sure drive isn't write protected if user wants to write. */
2839 if (tape
->write_prot
) {
2840 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
2841 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
2842 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2848 /* Lock the tape drive door so user can't eject. */
2849 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2850 if (idetape_create_prevent_cmd(drive
, &pc
, 1)) {
2851 if (!idetape_queue_pc_tail(drive
, &pc
)) {
2852 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
2853 tape
->door_locked
= DOOR_LOCKED
;
2864 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
2866 idetape_tape_t
*tape
= drive
->driver_data
;
2868 idetape_empty_write_pipeline(drive
);
2869 tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 1, 0);
2870 if (tape
->merge_stage
!= NULL
) {
2871 idetape_pad_zeros(drive
, tape
->blk_size
*
2872 (tape
->user_bs_factor
- 1));
2873 __idetape_kfree_stage(tape
->merge_stage
);
2874 tape
->merge_stage
= NULL
;
2876 idetape_write_filemark(drive
);
2877 idetape_flush_tape_buffers(drive
);
2878 idetape_flush_tape_buffers(drive
);
2881 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
2883 struct ide_tape_obj
*tape
= ide_tape_f(filp
);
2884 ide_drive_t
*drive
= tape
->drive
;
2885 struct ide_atapi_pc pc
;
2886 unsigned int minor
= iminor(inode
);
2889 tape
= drive
->driver_data
;
2891 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2893 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
2894 idetape_write_release(drive
, minor
);
2895 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
2897 idetape_discard_read_pipeline(drive
, 1);
2899 idetape_wait_for_pipeline(drive
);
2902 if (minor
< 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT
, &tape
->flags
))
2903 (void) idetape_rewind_tape(drive
);
2904 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2905 if (tape
->door_locked
== DOOR_LOCKED
) {
2906 if (idetape_create_prevent_cmd(drive
, &pc
, 0)) {
2907 if (!idetape_queue_pc_tail(drive
, &pc
))
2908 tape
->door_locked
= DOOR_UNLOCKED
;
2912 clear_bit(IDETAPE_FLAG_BUSY
, &tape
->flags
);
2919 * check the contents of the ATAPI IDENTIFY command results. We return:
2921 * 1 - If the tape can be supported by us, based on the information we have so
2924 * 0 - If this tape driver is not currently supported by us.
2926 static int idetape_identify_device(ide_drive_t
*drive
)
2928 u8 gcw
[2], protocol
, device_type
, removable
, packet_size
;
2930 if (drive
->id_read
== 0)
2933 *((unsigned short *) &gcw
) = drive
->id
->config
;
2935 protocol
= (gcw
[1] & 0xC0) >> 6;
2936 device_type
= gcw
[1] & 0x1F;
2937 removable
= !!(gcw
[0] & 0x80);
2938 packet_size
= gcw
[0] & 0x3;
2940 /* Check that we can support this device */
2942 printk(KERN_ERR
"ide-tape: Protocol (0x%02x) is not ATAPI\n",
2944 else if (device_type
!= 1)
2945 printk(KERN_ERR
"ide-tape: Device type (0x%02x) is not set "
2946 "to tape\n", device_type
);
2947 else if (!removable
)
2948 printk(KERN_ERR
"ide-tape: The removable flag is not set\n");
2949 else if (packet_size
!= 0) {
2950 printk(KERN_ERR
"ide-tape: Packet size (0x%02x) is not 12"
2951 " bytes\n", packet_size
);
2957 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
2959 idetape_tape_t
*tape
= drive
->driver_data
;
2960 struct ide_atapi_pc pc
;
2961 char fw_rev
[6], vendor_id
[10], product_id
[18];
2963 idetape_create_inquiry_cmd(&pc
);
2964 if (idetape_queue_pc_tail(drive
, &pc
)) {
2965 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
2969 memcpy(vendor_id
, &pc
.buf
[8], 8);
2970 memcpy(product_id
, &pc
.buf
[16], 16);
2971 memcpy(fw_rev
, &pc
.buf
[32], 4);
2973 ide_fixstring(vendor_id
, 10, 0);
2974 ide_fixstring(product_id
, 18, 0);
2975 ide_fixstring(fw_rev
, 6, 0);
2977 printk(KERN_INFO
"ide-tape: %s <-> %s: %s %s rev %s\n",
2978 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
2982 * Ask the tape about its various parameters. In particular, we will adjust our
2983 * data transfer buffer size to the recommended value as returned by the tape.
2985 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
2987 idetape_tape_t
*tape
= drive
->driver_data
;
2988 struct ide_atapi_pc pc
;
2990 u8 speed
, max_speed
;
2992 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
2993 if (idetape_queue_pc_tail(drive
, &pc
)) {
2994 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
2995 " some default values\n");
2996 tape
->blk_size
= 512;
2997 put_unaligned(52, (u16
*)&tape
->caps
[12]);
2998 put_unaligned(540, (u16
*)&tape
->caps
[14]);
2999 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
3002 caps
= pc
.buf
+ 4 + pc
.buf
[3];
3004 /* convert to host order and save for later use */
3005 speed
= be16_to_cpu(*(u16
*)&caps
[14]);
3006 max_speed
= be16_to_cpu(*(u16
*)&caps
[8]);
3008 put_unaligned(max_speed
, (u16
*)&caps
[8]);
3009 put_unaligned(be16_to_cpu(*(u16
*)&caps
[12]), (u16
*)&caps
[12]);
3010 put_unaligned(speed
, (u16
*)&caps
[14]);
3011 put_unaligned(be16_to_cpu(*(u16
*)&caps
[16]), (u16
*)&caps
[16]);
3014 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
3015 "(assuming 650KB/sec)\n", drive
->name
);
3016 put_unaligned(650, (u16
*)&caps
[14]);
3019 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
3020 "(assuming 650KB/sec)\n", drive
->name
);
3021 put_unaligned(650, (u16
*)&caps
[8]);
3024 memcpy(&tape
->caps
, caps
, 20);
3026 tape
->blk_size
= 512;
3027 else if (caps
[7] & 0x04)
3028 tape
->blk_size
= 1024;
3031 #ifdef CONFIG_IDE_PROC_FS
3032 static void idetape_add_settings(ide_drive_t
*drive
)
3034 idetape_tape_t
*tape
= drive
->driver_data
;
3036 ide_add_setting(drive
, "buffer", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
3037 1, 2, (u16
*)&tape
->caps
[16], NULL
);
3038 ide_add_setting(drive
, "pipeline_min", SETTING_RW
, TYPE_INT
, 1, 0xffff,
3039 tape
->stage_size
/ 1024, 1, &tape
->min_pipeline
, NULL
);
3040 ide_add_setting(drive
, "pipeline", SETTING_RW
, TYPE_INT
, 1, 0xffff,
3041 tape
->stage_size
/ 1024, 1, &tape
->max_stages
, NULL
);
3042 ide_add_setting(drive
, "pipeline_max", SETTING_RW
, TYPE_INT
, 1, 0xffff,
3043 tape
->stage_size
/ 1024, 1, &tape
->max_pipeline
, NULL
);
3044 ide_add_setting(drive
, "pipeline_used", SETTING_READ
, TYPE_INT
, 0,
3045 0xffff, tape
->stage_size
/ 1024, 1, &tape
->nr_stages
,
3047 ide_add_setting(drive
, "pipeline_pending", SETTING_READ
, TYPE_INT
, 0,
3048 0xffff, tape
->stage_size
/ 1024, 1,
3049 &tape
->nr_pending_stages
, NULL
);
3050 ide_add_setting(drive
, "speed", SETTING_READ
, TYPE_SHORT
, 0, 0xffff,
3051 1, 1, (u16
*)&tape
->caps
[14], NULL
);
3052 ide_add_setting(drive
, "stage", SETTING_READ
, TYPE_INT
, 0, 0xffff, 1,
3053 1024, &tape
->stage_size
, NULL
);
3054 ide_add_setting(drive
, "tdsc", SETTING_RW
, TYPE_INT
, IDETAPE_DSC_RW_MIN
,
3055 IDETAPE_DSC_RW_MAX
, 1000, HZ
, &tape
->best_dsc_rw_freq
,
3057 ide_add_setting(drive
, "dsc_overlap", SETTING_RW
, TYPE_BYTE
, 0, 1, 1,
3058 1, &drive
->dsc_overlap
, NULL
);
3059 ide_add_setting(drive
, "avg_speed", SETTING_READ
, TYPE_INT
, 0, 0xffff,
3060 1, 1, &tape
->avg_speed
, NULL
);
3061 ide_add_setting(drive
, "debug_mask", SETTING_RW
, TYPE_INT
, 0, 0xffff, 1,
3062 1, &tape
->debug_mask
, NULL
);
3065 static inline void idetape_add_settings(ide_drive_t
*drive
) { ; }
3069 * The function below is called to:
3071 * 1. Initialize our various state variables.
3072 * 2. Ask the tape for its capabilities.
3073 * 3. Allocate a buffer which will be used for data transfer. The buffer size
3074 * is chosen based on the recommendation which we received in step 2.
3076 * Note that at this point ide.c already assigned us an irq, so that we can
3077 * queue requests here and wait for their completion.
3079 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
3081 unsigned long t1
, tmid
, tn
, t
;
3086 u16
*ctl
= (u16
*)&tape
->caps
[12];
3088 spin_lock_init(&tape
->lock
);
3089 drive
->dsc_overlap
= 1;
3090 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
3091 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
3093 drive
->dsc_overlap
= 0;
3095 /* Seagate Travan drives do not support DSC overlap. */
3096 if (strstr(drive
->id
->model
, "Seagate STT3401"))
3097 drive
->dsc_overlap
= 0;
3098 tape
->minor
= minor
;
3099 tape
->name
[0] = 'h';
3100 tape
->name
[1] = 't';
3101 tape
->name
[2] = '0' + minor
;
3102 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
3103 tape
->pc
= tape
->pc_stack
;
3104 *((unsigned short *) &gcw
) = drive
->id
->config
;
3106 /* Command packet DRQ type */
3107 if (((gcw
[0] & 0x60) >> 5) == 1)
3108 set_bit(IDETAPE_FLAG_DRQ_INTERRUPT
, &tape
->flags
);
3110 tape
->min_pipeline
= 10;
3111 tape
->max_pipeline
= 10;
3112 tape
->max_stages
= 10;
3114 idetape_get_inquiry_results(drive
);
3115 idetape_get_mode_sense_results(drive
);
3116 ide_tape_get_bsize_from_bdesc(drive
);
3117 tape
->user_bs_factor
= 1;
3118 tape
->stage_size
= *ctl
* tape
->blk_size
;
3119 while (tape
->stage_size
> 0xffff) {
3120 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
3122 tape
->stage_size
= *ctl
* tape
->blk_size
;
3124 stage_size
= tape
->stage_size
;
3125 tape
->pages_per_stage
= stage_size
/ PAGE_SIZE
;
3126 if (stage_size
% PAGE_SIZE
) {
3127 tape
->pages_per_stage
++;
3128 tape
->excess_bh_size
= PAGE_SIZE
- stage_size
% PAGE_SIZE
;
3131 /* Select the "best" DSC read/write polling freq and pipeline size. */
3132 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
3134 tape
->max_stages
= speed
* 1000 * 10 / tape
->stage_size
;
3136 /* Limit memory use for pipeline to 10% of physical memory */
3138 if (tape
->max_stages
* tape
->stage_size
>
3139 si
.totalram
* si
.mem_unit
/ 10)
3141 si
.totalram
* si
.mem_unit
/ (10 * tape
->stage_size
);
3143 tape
->max_stages
= min(tape
->max_stages
, IDETAPE_MAX_PIPELINE_STAGES
);
3144 tape
->min_pipeline
= min(tape
->max_stages
, IDETAPE_MIN_PIPELINE_STAGES
);
3145 tape
->max_pipeline
=
3146 min(tape
->max_stages
* 2, IDETAPE_MAX_PIPELINE_STAGES
);
3147 if (tape
->max_stages
== 0) {
3148 tape
->max_stages
= 1;
3149 tape
->min_pipeline
= 1;
3150 tape
->max_pipeline
= 1;
3153 t1
= (tape
->stage_size
* HZ
) / (speed
* 1000);
3154 tmid
= (*(u16
*)&tape
->caps
[16] * 32 * HZ
) / (speed
* 125);
3155 tn
= (IDETAPE_FIFO_THRESHOLD
* tape
->stage_size
* HZ
) / (speed
* 1000);
3157 if (tape
->max_stages
)
3163 * Ensure that the number we got makes sense; limit it within
3164 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
3166 tape
->best_dsc_rw_freq
= max_t(unsigned long,
3167 min_t(unsigned long, t
, IDETAPE_DSC_RW_MAX
),
3168 IDETAPE_DSC_RW_MIN
);
3169 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
3170 "%dkB pipeline, %lums tDSC%s\n",
3171 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
3172 (*(u16
*)&tape
->caps
[16] * 512) / tape
->stage_size
,
3173 tape
->stage_size
/ 1024,
3174 tape
->max_stages
* tape
->stage_size
/ 1024,
3175 tape
->best_dsc_rw_freq
* 1000 / HZ
,
3176 drive
->using_dma
? ", DMA":"");
3178 idetape_add_settings(drive
);
3181 static void ide_tape_remove(ide_drive_t
*drive
)
3183 idetape_tape_t
*tape
= drive
->driver_data
;
3185 ide_proc_unregister_driver(drive
, tape
->driver
);
3187 ide_unregister_region(tape
->disk
);
3192 static void ide_tape_release(struct kref
*kref
)
3194 struct ide_tape_obj
*tape
= to_ide_tape(kref
);
3195 ide_drive_t
*drive
= tape
->drive
;
3196 struct gendisk
*g
= tape
->disk
;
3198 BUG_ON(tape
->first_stage
!= NULL
|| tape
->merge_stage_size
);
3200 drive
->dsc_overlap
= 0;
3201 drive
->driver_data
= NULL
;
3202 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
3203 device_destroy(idetape_sysfs_class
,
3204 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
3205 idetape_devs
[tape
->minor
] = NULL
;
3206 g
->private_data
= NULL
;
3211 #ifdef CONFIG_IDE_PROC_FS
3212 static int proc_idetape_read_name
3213 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
3215 ide_drive_t
*drive
= (ide_drive_t
*) data
;
3216 idetape_tape_t
*tape
= drive
->driver_data
;
3220 len
= sprintf(out
, "%s\n", tape
->name
);
3221 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
3224 static ide_proc_entry_t idetape_proc
[] = {
3225 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
3226 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
3227 { NULL
, 0, NULL
, NULL
}
3231 static int ide_tape_probe(ide_drive_t
*);
3233 static ide_driver_t idetape_driver
= {
3235 .owner
= THIS_MODULE
,
3237 .bus
= &ide_bus_type
,
3239 .probe
= ide_tape_probe
,
3240 .remove
= ide_tape_remove
,
3241 .version
= IDETAPE_VERSION
,
3243 .supports_dsc_overlap
= 1,
3244 .do_request
= idetape_do_request
,
3245 .end_request
= idetape_end_request
,
3246 .error
= __ide_error
,
3247 .abort
= __ide_abort
,
3248 #ifdef CONFIG_IDE_PROC_FS
3249 .proc
= idetape_proc
,
3253 /* Our character device supporting functions, passed to register_chrdev. */
3254 static const struct file_operations idetape_fops
= {
3255 .owner
= THIS_MODULE
,
3256 .read
= idetape_chrdev_read
,
3257 .write
= idetape_chrdev_write
,
3258 .ioctl
= idetape_chrdev_ioctl
,
3259 .open
= idetape_chrdev_open
,
3260 .release
= idetape_chrdev_release
,
3263 static int idetape_open(struct inode
*inode
, struct file
*filp
)
3265 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
3266 struct ide_tape_obj
*tape
;
3268 tape
= ide_tape_get(disk
);
3275 static int idetape_release(struct inode
*inode
, struct file
*filp
)
3277 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
3278 struct ide_tape_obj
*tape
= ide_tape_g(disk
);
3285 static int idetape_ioctl(struct inode
*inode
, struct file
*file
,
3286 unsigned int cmd
, unsigned long arg
)
3288 struct block_device
*bdev
= inode
->i_bdev
;
3289 struct ide_tape_obj
*tape
= ide_tape_g(bdev
->bd_disk
);
3290 ide_drive_t
*drive
= tape
->drive
;
3291 int err
= generic_ide_ioctl(drive
, file
, bdev
, cmd
, arg
);
3293 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
3297 static struct block_device_operations idetape_block_ops
= {
3298 .owner
= THIS_MODULE
,
3299 .open
= idetape_open
,
3300 .release
= idetape_release
,
3301 .ioctl
= idetape_ioctl
,
3304 static int ide_tape_probe(ide_drive_t
*drive
)
3306 idetape_tape_t
*tape
;
3310 if (!strstr("ide-tape", drive
->driver_req
))
3312 if (!drive
->present
)
3314 if (drive
->media
!= ide_tape
)
3316 if (!idetape_identify_device(drive
)) {
3317 printk(KERN_ERR
"ide-tape: %s: not supported by this version of"
3318 " the driver\n", drive
->name
);
3322 printk(KERN_INFO
"ide-tape: passing drive %s to ide-scsi"
3323 " emulation.\n", drive
->name
);
3326 tape
= kzalloc(sizeof(idetape_tape_t
), GFP_KERNEL
);
3328 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape struct\n",
3333 g
= alloc_disk(1 << PARTN_BITS
);
3337 ide_init_disk(g
, drive
);
3339 ide_proc_register_driver(drive
, &idetape_driver
);
3341 kref_init(&tape
->kref
);
3343 tape
->drive
= drive
;
3344 tape
->driver
= &idetape_driver
;
3347 g
->private_data
= &tape
->driver
;
3349 drive
->driver_data
= tape
;
3351 mutex_lock(&idetape_ref_mutex
);
3352 for (minor
= 0; idetape_devs
[minor
]; minor
++)
3354 idetape_devs
[minor
] = tape
;
3355 mutex_unlock(&idetape_ref_mutex
);
3357 idetape_setup(drive
, tape
, minor
);
3359 device_create(idetape_sysfs_class
, &drive
->gendev
,
3360 MKDEV(IDETAPE_MAJOR
, minor
), "%s", tape
->name
);
3361 device_create(idetape_sysfs_class
, &drive
->gendev
,
3362 MKDEV(IDETAPE_MAJOR
, minor
+ 128), "n%s", tape
->name
);
3364 g
->fops
= &idetape_block_ops
;
3365 ide_register_region(g
);
3375 static void __exit
idetape_exit(void)
3377 driver_unregister(&idetape_driver
.gen_driver
);
3378 class_destroy(idetape_sysfs_class
);
3379 unregister_chrdev(IDETAPE_MAJOR
, "ht");
3382 static int __init
idetape_init(void)
3385 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
3386 if (IS_ERR(idetape_sysfs_class
)) {
3387 idetape_sysfs_class
= NULL
;
3388 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
3393 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
3394 printk(KERN_ERR
"ide-tape: Failed to register chrdev"
3397 goto out_free_class
;
3400 error
= driver_register(&idetape_driver
.gen_driver
);
3402 goto out_free_driver
;
3407 driver_unregister(&idetape_driver
.gen_driver
);
3409 class_destroy(idetape_sysfs_class
);
3414 MODULE_ALIAS("ide:*m-tape*");
3415 module_init(idetape_init
);
3416 module_exit(idetape_exit
);
3417 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);
3418 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
3419 MODULE_LICENSE("GPL");