2 * IDE ATAPI streaming tape driver.
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
18 #define IDETAPE_VERSION "1.19"
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/timer.h>
27 #include <linux/interrupt.h>
28 #include <linux/jiffies.h>
29 #include <linux/major.h>
30 #include <linux/errno.h>
31 #include <linux/genhd.h>
32 #include <linux/slab.h>
33 #include <linux/pci.h>
34 #include <linux/ide.h>
35 #include <linux/smp_lock.h>
36 #include <linux/completion.h>
37 #include <linux/bitops.h>
38 #include <linux/mutex.h>
39 #include <scsi/scsi.h>
41 #include <asm/byteorder.h>
43 #include <asm/uaccess.h>
45 #include <asm/unaligned.h>
46 #include <linux/mtio.h>
49 /* output errors only */
51 /* output all sense key/asc */
53 /* info regarding all chrdev-related procedures */
54 DBG_CHRDEV = (1 << 2),
55 /* all remaining procedures */
57 /* buffer alloc info (pc_stack & rq_stack) */
58 DBG_PCRQ_STACK = (1 << 4),
61 /* define to see debug info */
62 #define IDETAPE_DEBUG_LOG 0
65 #define debug_log(lvl, fmt, args...) \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
71 #define debug_log(lvl, fmt, args...) do {} while (0)
74 /**************************** Tunable parameters *****************************/
78 * Pipelined mode parameters.
80 * We try to use the minimum number of stages which is enough to keep the tape
81 * constantly streaming. To accomplish that, we implement a feedback loop around
82 * the maximum number of stages:
84 * We start from MIN maximum stages (we will not even use MIN stages if we don't
85 * need them), increment it by RATE*(MAX-MIN) whenever we sense that the
86 * pipeline is empty, until we reach the optimum value or until we reach MAX.
88 * Setting the following parameter to 0 is illegal: the pipelined mode cannot be
89 * disabled (idetape_calculate_speeds() divides by tape->max_stages.)
91 #define IDETAPE_MIN_PIPELINE_STAGES 1
92 #define IDETAPE_MAX_PIPELINE_STAGES 400
93 #define IDETAPE_INCREASE_STAGES_RATE 20
96 * After each failed packet command we issue a request sense command and retry
97 * the packet command IDETAPE_MAX_PC_RETRIES times.
99 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
101 #define IDETAPE_MAX_PC_RETRIES 3
104 * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE
105 * bytes. This is used for several packet commands (Not for READ/WRITE commands)
107 #define IDETAPE_PC_BUFFER_SIZE 256
110 * In various places in the driver, we need to allocate storage
111 * for packet commands and requests, which will remain valid while
112 * we leave the driver to wait for an interrupt or a timeout event.
114 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
117 * Some drives (for example, Seagate STT3401A Travan) require a very long
118 * timeout, because they don't return an interrupt or clear their busy bit
119 * until after the command completes (even retension commands).
121 #define IDETAPE_WAIT_CMD (900*HZ)
124 * The following parameter is used to select the point in the internal tape fifo
125 * in which we will start to refill the buffer. Decreasing the following
126 * parameter will improve the system's latency and interactive response, while
127 * using a high value might improve system throughput.
129 #define IDETAPE_FIFO_THRESHOLD 2
132 * DSC polling parameters.
134 * Polling for DSC (a single bit in the status register) is a very important
135 * function in ide-tape. There are two cases in which we poll for DSC:
137 * 1. Before a read/write packet command, to ensure that we can transfer data
138 * from/to the tape's data buffers, without causing an actual media access.
139 * In case the tape is not ready yet, we take out our request from the device
140 * request queue, so that ide.c could service requests from the other device
141 * on the same interface in the meantime.
143 * 2. After the successful initialization of a "media access packet command",
144 * which is a command that can take a long time to complete (the interval can
145 * range from several seconds to even an hour). Again, we postpone our request
146 * in the middle to free the bus for the other device. The polling frequency
147 * here should be lower than the read/write frequency since those media access
148 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
149 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
150 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
152 * We also set a timeout for the timer, in case something goes wrong. The
153 * timeout should be longer then the maximum execution time of a tape operation.
157 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
158 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
159 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
160 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
161 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
162 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
163 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
165 /*************************** End of tunable parameters ***********************/
167 /* Read/Write error simulation */
168 #define SIMULATE_ERRORS 0
170 /* tape directions */
172 IDETAPE_DIR_NONE = (1 << 0),
173 IDETAPE_DIR_READ = (1 << 1),
174 IDETAPE_DIR_WRITE = (1 << 2),
180 struct idetape_bh *b_reqnext;
184 typedef struct idetape_packet_command_s {
185 /* Actual packet bytes */
187 /* On each retry, we increment retries */
191 /* Bytes to transfer */
192 int request_transfer;
193 /* Bytes actually transferred */
194 int actually_transferred;
195 /* Size of our data buffer */
197 struct idetape_bh *bh;
202 /* Pointer into the above buffer */
203 u8 *current_position;
204 /* Called when this packet command is completed */
205 ide_startstop_t (*callback) (ide_drive_t *);
206 /* Temporary buffer */
207 u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE];
208 /* Status/Action bit flags: long for set_bit */
213 * Packet command flag bits.
215 /* Set when an error is considered normal - We won't retry */
217 /* 1 When polling for DSC on a media access command */
218 #define PC_WAIT_FOR_DSC 1
219 /* 1 when we prefer to use DMA if possible */
220 #define PC_DMA_RECOMMENDED 2
221 /* 1 while DMA in progress */
222 #define PC_DMA_IN_PROGRESS 3
223 /* 1 when encountered problem during DMA */
224 #define PC_DMA_ERROR 4
228 /* A pipeline stage. */
229 typedef struct idetape_stage_s {
230 struct request rq; /* The corresponding request */
231 struct idetape_bh *bh; /* The data buffers */
232 struct idetape_stage_s *next; /* Pointer to the next stage */
236 * Most of our global data which we need to save even as we leave the driver due
237 * to an interrupt or a timer event is stored in the struct defined below.
239 typedef struct ide_tape_obj {
241 ide_driver_t *driver;
242 struct gendisk *disk;
246 * Since a typical character device operation requires more
247 * than one packet command, we provide here enough memory
248 * for the maximum of interconnected packet commands.
249 * The packet commands are stored in the circular array pc_stack.
250 * pc_stack_index points to the last used entry, and warps around
251 * to the start when we get to the last array entry.
253 * pc points to the current processed packet command.
255 * failed_pc points to the last failed packet command, or contains
256 * NULL if we do not need to retry any packet command. This is
257 * required since an additional packet command is needed before the
258 * retry, to get detailed information on what went wrong.
260 /* Current packet command */
262 /* Last failed packet command */
263 idetape_pc_t *failed_pc;
264 /* Packet command stack */
265 idetape_pc_t pc_stack[IDETAPE_PC_STACK];
266 /* Next free packet command storage space */
268 struct request rq_stack[IDETAPE_PC_STACK];
269 /* We implement a circular array */
273 * DSC polling variables.
275 * While polling for DSC we use postponed_rq to postpone the current
276 * request so that ide.c will be able to service pending requests on the
277 * other device. Note that at most we will have only one DSC (usually
278 * data transfer) request in the device request queue. Additional
279 * requests can be queued in our internal pipeline, but they will be
280 * visible to ide.c only one at a time.
282 struct request *postponed_rq;
283 /* The time in which we started polling for DSC */
284 unsigned long dsc_polling_start;
285 /* Timer used to poll for dsc */
286 struct timer_list dsc_timer;
287 /* Read/Write dsc polling frequency */
288 unsigned long best_dsc_rw_freq;
289 unsigned long dsc_poll_freq;
290 unsigned long dsc_timeout;
292 /* Read position information */
295 unsigned int first_frame;
297 /* Last error information */
298 u8 sense_key, asc, ascq;
300 /* Character device operation */
304 /* Current character device data transfer direction */
307 /* tape block size, usually 512 or 1024 bytes */
308 unsigned short blk_size;
311 /* Copy of the tape's Capabilities and Mechanical Page */
315 * Active data transfer request parameters.
317 * At most, there is only one ide-tape originated data transfer request
318 * in the device request queue. This allows ide.c to easily service
319 * requests from the other device when we postpone our active request.
320 * In the pipelined operation mode, we use our internal pipeline
321 * structure to hold more data requests. The data buffer size is chosen
322 * based on the tape's recommendation.
324 /* ptr to the request which is waiting in the device request queue */
325 struct request *active_data_rq;
326 /* Data buffer size chosen based on the tape's recommendation */
328 idetape_stage_t *merge_stage;
329 int merge_stage_size;
330 struct idetape_bh *bh;
335 * Pipeline parameters.
337 * To accomplish non-pipelined mode, we simply set the following
338 * variables to zero (or NULL, where appropriate).
340 /* Number of currently used stages */
342 /* Number of pending stages */
343 int nr_pending_stages;
344 /* We will not allocate more than this number of stages */
345 int max_stages, min_pipeline, max_pipeline;
346 /* The first stage which will be removed from the pipeline */
347 idetape_stage_t *first_stage;
348 /* The currently active stage */
349 idetape_stage_t *active_stage;
350 /* Will be serviced after the currently active request */
351 idetape_stage_t *next_stage;
352 /* New requests will be added to the pipeline here */
353 idetape_stage_t *last_stage;
354 /* Optional free stage which we can use */
355 idetape_stage_t *cache_stage;
357 /* Wasted space in each stage */
360 /* Status/Action flags: long for set_bit */
362 /* protects the ide-tape queue */
365 /* Measures average tape speed */
366 unsigned long avg_time;
370 /* the door is currently locked */
372 /* the tape hardware is write protected */
374 /* the tape is write protected (hardware or opened as read-only) */
378 * Limit the number of times a request can be postponed, to avoid an
379 * infinite postpone deadlock.
384 * Measures number of frames:
386 * 1. written/read to/from the driver pipeline (pipeline_head).
387 * 2. written/read to/from the tape buffers (idetape_bh).
388 * 3. written/read by the tape to/from the media (tape_head).
395 /* Speed control at the tape buffers input/output */
396 unsigned long insert_time;
399 int max_insert_speed;
400 int measure_insert_time;
402 /* Speed regulation negative feedback loop */
404 int pipeline_head_speed;
405 int controlled_pipeline_head_speed;
406 int uncontrolled_pipeline_head_speed;
407 int controlled_last_pipeline_head;
408 unsigned long uncontrolled_pipeline_head_time;
409 unsigned long controlled_pipeline_head_time;
410 int controlled_previous_pipeline_head;
411 int uncontrolled_previous_pipeline_head;
412 unsigned long controlled_previous_head_time;
413 unsigned long uncontrolled_previous_head_time;
414 int restart_speed_control_req;
419 static DEFINE_MUTEX(idetape_ref_mutex);
421 static struct class *idetape_sysfs_class;
423 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
425 #define ide_tape_g(disk) \
426 container_of((disk)->private_data, struct ide_tape_obj, driver)
428 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
430 struct ide_tape_obj *tape = NULL;
432 mutex_lock(&idetape_ref_mutex);
433 tape = ide_tape_g(disk);
435 kref_get(&tape->kref);
436 mutex_unlock(&idetape_ref_mutex);
440 static void ide_tape_release(struct kref *);
442 static void ide_tape_put(struct ide_tape_obj *tape)
444 mutex_lock(&idetape_ref_mutex);
445 kref_put(&tape->kref, ide_tape_release);
446 mutex_unlock(&idetape_ref_mutex);
449 /* Tape door status */
450 #define DOOR_UNLOCKED 0
451 #define DOOR_LOCKED 1
452 #define DOOR_EXPLICITLY_LOCKED 2
455 * Tape flag bits values.
457 #define IDETAPE_IGNORE_DSC 0
458 #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
459 #define IDETAPE_BUSY 2 /* Device already opened */
460 #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
461 #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
462 #define IDETAPE_FILEMARK 5 /* Currently on a filemark */
463 #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
464 #define IDETAPE_READ_ERROR 7
465 #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
466 /* 0 = no tape is loaded, so we don't rewind after ejecting */
467 #define IDETAPE_MEDIUM_PRESENT 9
469 /* A define for the READ BUFFER command */
470 #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
472 /* Some defines for the SPACE command */
473 #define IDETAPE_SPACE_OVER_FILEMARK 1
474 #define IDETAPE_SPACE_TO_EOD 3
476 /* Some defines for the LOAD UNLOAD command */
477 #define IDETAPE_LU_LOAD_MASK 1
478 #define IDETAPE_LU_RETENSION_MASK 2
479 #define IDETAPE_LU_EOT_MASK 4
482 * Special requests for our block device strategy routine.
484 * In order to service a character device command, we add special requests to
485 * the tail of our block device request queue and wait for their completion.
489 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
490 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
491 REQ_IDETAPE_READ = (1 << 2),
492 REQ_IDETAPE_WRITE = (1 << 3),
493 REQ_IDETAPE_READ_BUFFER = (1 << 4),
496 /* Error codes returned in rq->errors to the higher part of the driver. */
497 #define IDETAPE_ERROR_GENERAL 101
498 #define IDETAPE_ERROR_FILEMARK 102
499 #define IDETAPE_ERROR_EOD 103
501 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
502 #define IDETAPE_BLOCK_DESCRIPTOR 0
503 #define IDETAPE_CAPABILITIES_PAGE 0x2a
506 * The variables below are used for the character device interface. Additional
507 * state variables are defined in our ide_drive_t structure.
509 static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES];
511 #define ide_tape_f(file) ((file)->private_data)
513 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
515 struct ide_tape_obj *tape = NULL;
517 mutex_lock(&idetape_ref_mutex);
518 tape = idetape_devs[i];
520 kref_get(&tape->kref);
521 mutex_unlock(&idetape_ref_mutex);
525 static int idetape_chrdev_release (struct inode *inode, struct file *filp);
526 static void idetape_write_release (ide_drive_t *drive, unsigned int minor);
529 * Too bad. The drive wants to send us data which we are not ready to accept.
530 * Just throw it away.
532 static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount)
535 (void) HWIF(drive)->INB(IDE_DATA_REG);
538 static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
540 struct idetape_bh *bh = pc->bh;
545 printk(KERN_ERR "ide-tape: bh == NULL in "
546 "idetape_input_buffers\n");
547 idetape_discard_data(drive, bcount);
550 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount);
551 HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count);
553 atomic_add(count, &bh->b_count);
554 if (atomic_read(&bh->b_count) == bh->b_size) {
557 atomic_set(&bh->b_count, 0);
563 static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
565 struct idetape_bh *bh = pc->bh;
570 printk(KERN_ERR "ide-tape: bh == NULL in "
571 "idetape_output_buffers\n");
574 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
575 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
578 pc->b_count -= count;
580 pc->bh = bh = bh->b_reqnext;
582 pc->b_data = bh->b_data;
583 pc->b_count = atomic_read(&bh->b_count);
589 static void idetape_update_buffers (idetape_pc_t *pc)
591 struct idetape_bh *bh = pc->bh;
593 unsigned int bcount = pc->actually_transferred;
595 if (test_bit(PC_WRITING, &pc->flags))
599 printk(KERN_ERR "ide-tape: bh == NULL in "
600 "idetape_update_buffers\n");
603 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
604 atomic_set(&bh->b_count, count);
605 if (atomic_read(&bh->b_count) == bh->b_size)
613 * idetape_next_pc_storage returns a pointer to a place in which we can
614 * safely store a packet command, even though we intend to leave the
615 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
616 * commands is allocated at initialization time.
618 static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive)
620 idetape_tape_t *tape = drive->driver_data;
622 debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index);
624 if (tape->pc_stack_index == IDETAPE_PC_STACK)
625 tape->pc_stack_index=0;
626 return (&tape->pc_stack[tape->pc_stack_index++]);
630 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
631 * Since we queue packet commands in the request queue, we need to
632 * allocate a request, along with the allocation of a packet command.
635 /**************************************************************
637 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
638 * followed later on by kfree(). -ml *
640 **************************************************************/
642 static struct request *idetape_next_rq_storage (ide_drive_t *drive)
644 idetape_tape_t *tape = drive->driver_data;
646 debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index);
648 if (tape->rq_stack_index == IDETAPE_PC_STACK)
649 tape->rq_stack_index=0;
650 return (&tape->rq_stack[tape->rq_stack_index++]);
653 static void idetape_init_pc (idetape_pc_t *pc)
655 memset(pc->c, 0, 12);
658 pc->request_transfer = 0;
659 pc->buffer = pc->pc_buffer;
660 pc->buffer_size = IDETAPE_PC_BUFFER_SIZE;
666 * called on each failed packet command retry to analyze the request sense. We
667 * currently do not utilize this information.
669 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
671 idetape_tape_t *tape = drive->driver_data;
672 idetape_pc_t *pc = tape->failed_pc;
674 tape->sense_key = sense[2] & 0xF;
675 tape->asc = sense[12];
676 tape->ascq = sense[13];
678 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
679 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
681 /* Correct pc->actually_transferred by asking the tape. */
682 if (test_bit(PC_DMA_ERROR, &pc->flags)) {
683 pc->actually_transferred = pc->request_transfer -
685 be32_to_cpu(get_unaligned((u32 *)&sense[3]));
686 idetape_update_buffers(pc);
690 * If error was the result of a zero-length read or write command,
691 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
692 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
694 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
696 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
697 if (tape->sense_key == 5) {
698 /* don't report an error, everything's ok */
700 /* don't retry read/write */
701 set_bit(PC_ABORT, &pc->flags);
704 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
705 pc->error = IDETAPE_ERROR_FILEMARK;
706 set_bit(PC_ABORT, &pc->flags);
708 if (pc->c[0] == WRITE_6) {
709 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
710 && tape->asc == 0x0 && tape->ascq == 0x2)) {
711 pc->error = IDETAPE_ERROR_EOD;
712 set_bit(PC_ABORT, &pc->flags);
715 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
716 if (tape->sense_key == 8) {
717 pc->error = IDETAPE_ERROR_EOD;
718 set_bit(PC_ABORT, &pc->flags);
720 if (!test_bit(PC_ABORT, &pc->flags) &&
721 pc->actually_transferred)
722 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
726 static void idetape_activate_next_stage(ide_drive_t *drive)
728 idetape_tape_t *tape = drive->driver_data;
729 idetape_stage_t *stage = tape->next_stage;
730 struct request *rq = &stage->rq;
732 debug_log(DBG_PROCS, "Enter %s\n", __func__);
735 printk(KERN_ERR "ide-tape: bug: Trying to activate a non"
736 " existing stage\n");
740 rq->rq_disk = tape->disk;
742 rq->special = (void *)stage->bh;
743 tape->active_data_rq = rq;
744 tape->active_stage = stage;
745 tape->next_stage = stage->next;
748 /* Free a stage along with its related buffers completely. */
749 static void __idetape_kfree_stage (idetape_stage_t *stage)
751 struct idetape_bh *prev_bh, *bh = stage->bh;
755 if (bh->b_data != NULL) {
756 size = (int) bh->b_size;
758 free_page((unsigned long) bh->b_data);
760 bh->b_data += PAGE_SIZE;
770 static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage)
772 __idetape_kfree_stage(stage);
776 * Remove tape->first_stage from the pipeline. The caller should avoid race
779 static void idetape_remove_stage_head (ide_drive_t *drive)
781 idetape_tape_t *tape = drive->driver_data;
782 idetape_stage_t *stage;
784 debug_log(DBG_PROCS, "Enter %s\n", __func__);
786 if (tape->first_stage == NULL) {
787 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
790 if (tape->active_stage == tape->first_stage) {
791 printk(KERN_ERR "ide-tape: bug: Trying to free our active "
795 stage = tape->first_stage;
796 tape->first_stage = stage->next;
797 idetape_kfree_stage(tape, stage);
799 if (tape->first_stage == NULL) {
800 tape->last_stage = NULL;
801 if (tape->next_stage != NULL)
802 printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n");
804 printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n");
809 * This will free all the pipeline stages starting from new_last_stage->next
810 * to the end of the list, and point tape->last_stage to new_last_stage.
812 static void idetape_abort_pipeline(ide_drive_t *drive,
813 idetape_stage_t *new_last_stage)
815 idetape_tape_t *tape = drive->driver_data;
816 idetape_stage_t *stage = new_last_stage->next;
817 idetape_stage_t *nstage;
819 debug_log(DBG_PROCS, "%s: Enter %s\n", tape->name, __func__);
822 nstage = stage->next;
823 idetape_kfree_stage(tape, stage);
825 --tape->nr_pending_stages;
829 new_last_stage->next = NULL;
830 tape->last_stage = new_last_stage;
831 tape->next_stage = NULL;
835 * Finish servicing a request and insert a pending pipeline request into the
838 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
840 struct request *rq = HWGROUP(drive)->rq;
841 idetape_tape_t *tape = drive->driver_data;
844 int remove_stage = 0;
845 idetape_stage_t *active_stage;
847 debug_log(DBG_PROCS, "Enter %s\n", __func__);
850 case 0: error = IDETAPE_ERROR_GENERAL; break;
851 case 1: error = 0; break;
852 default: error = uptodate;
856 tape->failed_pc = NULL;
858 if (!blk_special_request(rq)) {
859 ide_end_request(drive, uptodate, nr_sects);
863 spin_lock_irqsave(&tape->lock, flags);
865 /* The request was a pipelined data transfer request */
866 if (tape->active_data_rq == rq) {
867 active_stage = tape->active_stage;
868 tape->active_stage = NULL;
869 tape->active_data_rq = NULL;
870 tape->nr_pending_stages--;
871 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
874 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
875 if (error == IDETAPE_ERROR_EOD)
876 idetape_abort_pipeline(drive, active_stage);
878 } else if (rq->cmd[0] & REQ_IDETAPE_READ) {
879 if (error == IDETAPE_ERROR_EOD) {
880 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
881 idetape_abort_pipeline(drive, active_stage);
884 if (tape->next_stage != NULL) {
885 idetape_activate_next_stage(drive);
887 /* Insert the next request into the request queue. */
888 (void)ide_do_drive_cmd(drive, tape->active_data_rq,
892 * This is a part of the feedback loop which tries to
893 * find the optimum number of stages. We are starting
894 * from a minimum maximum number of stages, and if we
895 * sense that the pipeline is empty, we try to increase
896 * it, until we reach the user compile time memory
899 int i = (tape->max_pipeline - tape->min_pipeline) / 10;
901 tape->max_stages += max(i, 1);
902 tape->max_stages = max(tape->max_stages,
904 tape->max_stages = min(tape->max_stages,
908 ide_end_drive_cmd(drive, 0, 0);
909 // blkdev_dequeue_request(rq);
911 // end_that_request_last(rq);
914 idetape_remove_stage_head(drive);
915 if (tape->active_data_rq == NULL)
916 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
917 spin_unlock_irqrestore(&tape->lock, flags);
921 static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive)
923 idetape_tape_t *tape = drive->driver_data;
925 debug_log(DBG_PROCS, "Enter %s\n", __func__);
927 if (!tape->pc->error) {
928 idetape_analyze_error(drive, tape->pc->buffer);
929 idetape_end_request(drive, 1, 0);
931 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
932 idetape_end_request(drive, 0, 0);
937 static void idetape_create_request_sense_cmd (idetape_pc_t *pc)
940 pc->c[0] = REQUEST_SENSE;
942 pc->request_transfer = 20;
943 pc->callback = &idetape_request_sense_callback;
946 static void idetape_init_rq(struct request *rq, u8 cmd)
948 memset(rq, 0, sizeof(*rq));
949 rq->cmd_type = REQ_TYPE_SPECIAL;
954 * Generate a new packet command request in front of the request queue, before
955 * the current request, so that it will be processed immediately, on the next
956 * pass through the driver. The function below is called from the request
957 * handling part of the driver (the "bottom" part). Safe storage for the request
958 * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that.
960 * Memory for those requests is pre-allocated at initialization time, and is
961 * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for
962 * the maximum possible number of inter-dependent packet commands.
964 * The higher level of the driver - The ioctl handler and the character device
965 * handling functions should queue request to the lower level part and wait for
966 * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail.
968 static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq)
970 struct ide_tape_obj *tape = drive->driver_data;
972 idetape_init_rq(rq, REQ_IDETAPE_PC1);
973 rq->buffer = (char *) pc;
974 rq->rq_disk = tape->disk;
975 (void) ide_do_drive_cmd(drive, rq, ide_preempt);
979 * idetape_retry_pc is called when an error was detected during the
980 * last packet command. We queue a request sense packet command in
981 * the head of the request list.
983 static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
985 idetape_tape_t *tape = drive->driver_data;
989 (void)ide_read_error(drive);
990 pc = idetape_next_pc_storage(drive);
991 rq = idetape_next_rq_storage(drive);
992 idetape_create_request_sense_cmd(pc);
993 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
994 idetape_queue_pc_head(drive, pc, rq);
999 * Postpone the current request so that ide.c will be able to service requests
1000 * from another device on the same hwgroup while we are polling for DSC.
1002 static void idetape_postpone_request (ide_drive_t *drive)
1004 idetape_tape_t *tape = drive->driver_data;
1006 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1008 tape->postponed_rq = HWGROUP(drive)->rq;
1009 ide_stall_queue(drive, tape->dsc_poll_freq);
1012 typedef void idetape_io_buf(ide_drive_t *, idetape_pc_t *, unsigned int);
1015 * This is the usual interrupt handler which will be called during a packet
1016 * command. We will transfer some of the data (as requested by the drive) and
1017 * will re-point interrupt handler to us. When data transfer is finished, we
1018 * will act according to the algorithm described before
1021 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
1023 ide_hwif_t *hwif = drive->hwif;
1024 idetape_tape_t *tape = drive->driver_data;
1025 idetape_pc_t *pc = tape->pc;
1026 xfer_func_t *xferfunc;
1027 idetape_io_buf *iobuf;
1030 static int error_sim_count = 0;
1035 debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__);
1037 /* Clear the interrupt */
1038 stat = ide_read_status(drive);
1040 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1041 if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) {
1043 * A DMA error is sometimes expected. For example,
1044 * if the tape is crossing a filemark during a
1045 * READ command, it will issue an irq and position
1046 * itself before the filemark, so that only a partial
1047 * data transfer will occur (which causes the DMA
1048 * error). In that case, we will later ask the tape
1049 * how much bytes of the original request were
1050 * actually transferred (we can't receive that
1051 * information from the DMA engine on most chipsets).
1055 * On the contrary, a DMA error is never expected;
1056 * it usually indicates a hardware error or abort.
1057 * If the tape crosses a filemark during a READ
1058 * command, it will issue an irq and position itself
1059 * after the filemark (not before). Only a partial
1060 * data transfer will occur, but no DMA error.
1063 set_bit(PC_DMA_ERROR, &pc->flags);
1065 pc->actually_transferred = pc->request_transfer;
1066 idetape_update_buffers(pc);
1068 debug_log(DBG_PROCS, "DMA finished\n");
1072 /* No more interrupts */
1073 if ((stat & DRQ_STAT) == 0) {
1074 debug_log(DBG_SENSE, "Packet command completed, %d bytes"
1075 " transferred\n", pc->actually_transferred);
1077 clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
1081 if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) &&
1082 (++error_sim_count % 100) == 0) {
1083 printk(KERN_INFO "ide-tape: %s: simulating error\n",
1088 if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
1090 if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) {
1091 /* Error detected */
1092 debug_log(DBG_ERR, "%s: I/O error\n", tape->name);
1094 if (pc->c[0] == REQUEST_SENSE) {
1095 printk(KERN_ERR "ide-tape: I/O error in request"
1096 " sense command\n");
1097 return ide_do_reset(drive);
1099 debug_log(DBG_ERR, "[cmd %x]: check condition\n",
1102 /* Retry operation */
1103 return idetape_retry_pc(drive);
1106 if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) &&
1107 (stat & SEEK_STAT) == 0) {
1108 /* Media access command */
1109 tape->dsc_polling_start = jiffies;
1110 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
1111 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
1112 /* Allow ide.c to handle other requests */
1113 idetape_postpone_request(drive);
1116 if (tape->failed_pc == pc)
1117 tape->failed_pc = NULL;
1118 /* Command finished - Call the callback function */
1119 return pc->callback(drive);
1121 if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1122 printk(KERN_ERR "ide-tape: The tape wants to issue more "
1123 "interrupts in DMA mode\n");
1124 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
1126 return ide_do_reset(drive);
1128 /* Get the number of bytes to transfer on this interrupt. */
1129 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) |
1130 hwif->INB(IDE_BCOUNTL_REG);
1132 ireason = hwif->INB(IDE_IREASON_REG);
1135 printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__);
1136 return ide_do_reset(drive);
1138 if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) {
1139 /* Hopefully, we will never get here */
1140 printk(KERN_ERR "ide-tape: We wanted to %s, ",
1141 (ireason & IO) ? "Write" : "Read");
1142 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
1143 (ireason & IO) ? "Read" : "Write");
1144 return ide_do_reset(drive);
1146 if (!test_bit(PC_WRITING, &pc->flags)) {
1147 /* Reading - Check that we have enough space */
1148 temp = pc->actually_transferred + bcount;
1149 if (temp > pc->request_transfer) {
1150 if (temp > pc->buffer_size) {
1151 printk(KERN_ERR "ide-tape: The tape wants to "
1152 "send us more data than expected "
1153 "- discarding data\n");
1154 idetape_discard_data(drive, bcount);
1155 ide_set_handler(drive, &idetape_pc_intr,
1156 IDETAPE_WAIT_CMD, NULL);
1159 debug_log(DBG_SENSE, "The tape wants to send us more "
1160 "data than expected - allowing transfer\n");
1162 iobuf = &idetape_input_buffers;
1163 xferfunc = hwif->atapi_input_bytes;
1165 iobuf = &idetape_output_buffers;
1166 xferfunc = hwif->atapi_output_bytes;
1170 iobuf(drive, pc, bcount);
1172 xferfunc(drive, pc->current_position, bcount);
1174 /* Update the current position */
1175 pc->actually_transferred += bcount;
1176 pc->current_position += bcount;
1178 debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n",
1181 /* And set the interrupt handler again */
1182 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1187 * Packet Command Interface
1189 * The current Packet Command is available in tape->pc, and will not change
1190 * until we finish handling it. Each packet command is associated with a
1191 * callback function that will be called when the command is finished.
1193 * The handling will be done in three stages:
1195 * 1. idetape_issue_pc will send the packet command to the drive, and will set
1196 * the interrupt handler to idetape_pc_intr.
1198 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
1199 * repeated until the device signals us that no more interrupts will be issued.
1201 * 3. ATAPI Tape media access commands have immediate status with a delayed
1202 * process. In case of a successful initiation of a media access packet command,
1203 * the DSC bit will be set when the actual execution of the command is finished.
1204 * Since the tape drive will not issue an interrupt, we have to poll for this
1205 * event. In this case, we define the request as "low priority request" by
1206 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
1209 * ide.c will then give higher priority to requests which originate from the
1210 * other device, until will change rq_status to RQ_ACTIVE.
1212 * 4. When the packet command is finished, it will be checked for errors.
1214 * 5. In case an error was found, we queue a request sense packet command in
1215 * front of the request queue and retry the operation up to
1216 * IDETAPE_MAX_PC_RETRIES times.
1218 * 6. In case no error was found, or we decided to give up and not to retry
1219 * again, the callback function will be called and then we will handle the next
1222 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
1224 ide_hwif_t *hwif = drive->hwif;
1225 idetape_tape_t *tape = drive->driver_data;
1226 idetape_pc_t *pc = tape->pc;
1228 ide_startstop_t startstop;
1231 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
1232 printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
1235 ireason = hwif->INB(IDE_IREASON_REG);
1236 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
1237 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
1238 "a packet command, retrying\n");
1240 ireason = hwif->INB(IDE_IREASON_REG);
1242 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
1243 "issuing a packet command, ignoring\n");
1248 if ((ireason & CD) == 0 || (ireason & IO)) {
1249 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
1250 "a packet command\n");
1251 return ide_do_reset(drive);
1253 /* Set the interrupt routine */
1254 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1255 #ifdef CONFIG_BLK_DEV_IDEDMA
1256 /* Begin DMA, if necessary */
1257 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags))
1258 hwif->dma_start(drive);
1260 /* Send the actual packet */
1261 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
1265 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, idetape_pc_t *pc)
1267 ide_hwif_t *hwif = drive->hwif;
1268 idetape_tape_t *tape = drive->driver_data;
1272 if (tape->pc->c[0] == REQUEST_SENSE &&
1273 pc->c[0] == REQUEST_SENSE) {
1274 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
1275 "Two request sense in serial were issued\n");
1278 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
1279 tape->failed_pc = pc;
1280 /* Set the current packet command */
1283 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
1284 test_bit(PC_ABORT, &pc->flags)) {
1286 * We will "abort" retrying a packet command in case legitimate
1287 * error code was received (crossing a filemark, or end of the
1288 * media, for example).
1290 if (!test_bit(PC_ABORT, &pc->flags)) {
1291 if (!(pc->c[0] == TEST_UNIT_READY &&
1292 tape->sense_key == 2 && tape->asc == 4 &&
1293 (tape->ascq == 1 || tape->ascq == 8))) {
1294 printk(KERN_ERR "ide-tape: %s: I/O error, "
1295 "pc = %2x, key = %2x, "
1296 "asc = %2x, ascq = %2x\n",
1297 tape->name, pc->c[0],
1298 tape->sense_key, tape->asc,
1302 pc->error = IDETAPE_ERROR_GENERAL;
1304 tape->failed_pc = NULL;
1305 return pc->callback(drive);
1307 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
1310 /* We haven't transferred any data yet */
1311 pc->actually_transferred = 0;
1312 pc->current_position = pc->buffer;
1313 /* Request to transfer the entire buffer at once */
1314 bcount = pc->request_transfer;
1316 if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) {
1317 printk(KERN_WARNING "ide-tape: DMA disabled, "
1318 "reverting to PIO\n");
1321 if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
1322 dma_ok = !hwif->dma_setup(drive);
1324 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
1325 IDE_TFLAG_OUT_DEVICE, bcount, dma_ok);
1327 if (dma_ok) /* Will begin DMA later */
1328 set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
1329 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) {
1330 ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc,
1331 IDETAPE_WAIT_CMD, NULL);
1334 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
1335 return idetape_transfer_pc(drive);
1339 static ide_startstop_t idetape_pc_callback (ide_drive_t *drive)
1341 idetape_tape_t *tape = drive->driver_data;
1343 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1345 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
1349 /* A mode sense command is used to "sense" tape parameters. */
1350 static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
1352 idetape_init_pc(pc);
1353 pc->c[0] = MODE_SENSE;
1354 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
1355 /* DBD = 1 - Don't return block descriptors */
1357 pc->c[2] = page_code;
1359 * Changed pc->c[3] to 0 (255 will at best return unused info).
1361 * For SCSI this byte is defined as subpage instead of high byte
1362 * of length and some IDE drives seem to interpret it this way
1363 * and return an error when 255 is used.
1366 /* We will just discard data in that case */
1368 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
1369 pc->request_transfer = 12;
1370 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
1371 pc->request_transfer = 24;
1373 pc->request_transfer = 50;
1374 pc->callback = &idetape_pc_callback;
1377 static void idetape_calculate_speeds(ide_drive_t *drive)
1379 idetape_tape_t *tape = drive->driver_data;
1381 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
1382 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
1383 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time;
1384 tape->controlled_last_pipeline_head = tape->pipeline_head;
1385 tape->controlled_pipeline_head_time = jiffies;
1387 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
1388 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time);
1389 else if (time_after(jiffies, tape->controlled_previous_head_time))
1390 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time);
1392 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) {
1393 /* -1 for read mode error recovery */
1394 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) {
1395 tape->uncontrolled_pipeline_head_time = jiffies;
1396 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time);
1399 tape->uncontrolled_previous_head_time = jiffies;
1400 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
1401 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) {
1402 tape->uncontrolled_pipeline_head_time = jiffies;
1405 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
1407 if (tape->speed_control == 1) {
1408 if (tape->nr_pending_stages >= tape->max_stages / 2)
1409 tape->max_insert_speed = tape->pipeline_head_speed +
1410 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
1412 tape->max_insert_speed = 500 +
1413 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
1415 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
1416 tape->max_insert_speed = 5000;
1418 tape->max_insert_speed = tape->speed_control;
1420 tape->max_insert_speed = max(tape->max_insert_speed, 500);
1423 static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
1425 idetape_tape_t *tape = drive->driver_data;
1426 idetape_pc_t *pc = tape->pc;
1429 stat = ide_read_status(drive);
1431 if (stat & SEEK_STAT) {
1432 if (stat & ERR_STAT) {
1433 /* Error detected */
1434 if (pc->c[0] != TEST_UNIT_READY)
1435 printk(KERN_ERR "ide-tape: %s: I/O error, ",
1437 /* Retry operation */
1438 return idetape_retry_pc(drive);
1441 if (tape->failed_pc == pc)
1442 tape->failed_pc = NULL;
1444 pc->error = IDETAPE_ERROR_GENERAL;
1445 tape->failed_pc = NULL;
1447 return pc->callback(drive);
1450 static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
1452 idetape_tape_t *tape = drive->driver_data;
1453 struct request *rq = HWGROUP(drive)->rq;
1454 int blocks = tape->pc->actually_transferred / tape->blk_size;
1456 tape->avg_size += blocks * tape->blk_size;
1457 tape->insert_size += blocks * tape->blk_size;
1458 if (tape->insert_size > 1024 * 1024)
1459 tape->measure_insert_time = 1;
1460 if (tape->measure_insert_time) {
1461 tape->measure_insert_time = 0;
1462 tape->insert_time = jiffies;
1463 tape->insert_size = 0;
1465 if (time_after(jiffies, tape->insert_time))
1466 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
1467 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
1468 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024;
1470 tape->avg_time = jiffies;
1472 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1474 tape->first_frame += blocks;
1475 rq->current_nr_sectors -= blocks;
1477 if (!tape->pc->error)
1478 idetape_end_request(drive, 1, 0);
1480 idetape_end_request(drive, tape->pc->error, 0);
1484 static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
1486 idetape_init_pc(pc);
1488 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
1490 pc->callback = &idetape_rw_callback;
1492 atomic_set(&bh->b_count, 0);
1494 pc->buffer_size = length * tape->blk_size;
1495 pc->request_transfer = pc->buffer_size;
1496 if (pc->request_transfer == tape->stage_size)
1497 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
1500 static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
1503 struct idetape_bh *p = bh;
1505 idetape_init_pc(pc);
1506 pc->c[0] = READ_BUFFER;
1507 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK;
1508 pc->c[7] = size >> 8;
1509 pc->c[8] = size & 0xff;
1510 pc->callback = &idetape_pc_callback;
1512 atomic_set(&bh->b_count, 0);
1515 atomic_set(&p->b_count, 0);
1518 pc->request_transfer = pc->buffer_size = size;
1521 static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
1523 idetape_init_pc(pc);
1525 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
1527 pc->callback = &idetape_rw_callback;
1528 set_bit(PC_WRITING, &pc->flags);
1530 pc->b_data = bh->b_data;
1531 pc->b_count = atomic_read(&bh->b_count);
1533 pc->buffer_size = length * tape->blk_size;
1534 pc->request_transfer = pc->buffer_size;
1535 if (pc->request_transfer == tape->stage_size)
1536 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
1539 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
1540 struct request *rq, sector_t block)
1542 idetape_tape_t *tape = drive->driver_data;
1543 idetape_pc_t *pc = NULL;
1544 struct request *postponed_rq = tape->postponed_rq;
1547 debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld,"
1548 " current_nr_sectors: %d\n",
1549 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
1551 if (!blk_special_request(rq)) {
1552 /* We do not support buffer cache originated requests. */
1553 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
1554 "request queue (%d)\n", drive->name, rq->cmd_type);
1555 ide_end_request(drive, 0, 0);
1559 /* Retry a failed packet command */
1560 if (tape->failed_pc != NULL &&
1561 tape->pc->c[0] == REQUEST_SENSE) {
1562 return idetape_issue_pc(drive, tape->failed_pc);
1564 if (postponed_rq != NULL)
1565 if (rq != postponed_rq) {
1566 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
1567 "Two DSC requests were queued\n");
1568 idetape_end_request(drive, 0, 0);
1572 tape->postponed_rq = NULL;
1575 * If the tape is still busy, postpone our request and service
1576 * the other device meanwhile.
1578 stat = ide_read_status(drive);
1580 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
1581 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1583 if (drive->post_reset == 1) {
1584 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1585 drive->post_reset = 0;
1588 if (time_after(jiffies, tape->insert_time))
1589 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
1590 idetape_calculate_speeds(drive);
1591 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
1592 (stat & SEEK_STAT) == 0) {
1593 if (postponed_rq == NULL) {
1594 tape->dsc_polling_start = jiffies;
1595 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
1596 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
1597 } else if (time_after(jiffies, tape->dsc_timeout)) {
1598 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
1600 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1601 idetape_media_access_finished(drive);
1604 return ide_do_reset(drive);
1606 } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD))
1607 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
1608 idetape_postpone_request(drive);
1611 if (rq->cmd[0] & REQ_IDETAPE_READ) {
1612 tape->buffer_head++;
1613 tape->postpone_cnt = 0;
1614 pc = idetape_next_pc_storage(drive);
1615 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
1618 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
1619 tape->buffer_head++;
1620 tape->postpone_cnt = 0;
1621 pc = idetape_next_pc_storage(drive);
1622 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
1625 if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) {
1626 tape->postpone_cnt = 0;
1627 pc = idetape_next_pc_storage(drive);
1628 idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
1631 if (rq->cmd[0] & REQ_IDETAPE_PC1) {
1632 pc = (idetape_pc_t *) rq->buffer;
1633 rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
1634 rq->cmd[0] |= REQ_IDETAPE_PC2;
1637 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1638 idetape_media_access_finished(drive);
1643 return idetape_issue_pc(drive, pc);
1646 /* Pipeline related functions */
1647 static inline int idetape_pipeline_active (idetape_tape_t *tape)
1651 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
1652 rc2 = (tape->active_data_rq != NULL);
1657 * The function below uses __get_free_page to allocate a pipeline stage, along
1658 * with all the necessary small buffers which together make a buffer of size
1659 * tape->stage_size (or a bit more). We attempt to combine sequential pages as
1662 * It returns a pointer to the new allocated stage, or NULL if we can't (or
1663 * don't want to) allocate a stage.
1665 * Pipeline stages are optional and are used to increase performance. If we
1666 * can't allocate them, we'll manage without them.
1668 static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear)
1670 idetape_stage_t *stage;
1671 struct idetape_bh *prev_bh, *bh;
1672 int pages = tape->pages_per_stage;
1673 char *b_data = NULL;
1675 if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
1679 bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1682 bh->b_reqnext = NULL;
1683 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
1686 memset(bh->b_data, 0, PAGE_SIZE);
1687 bh->b_size = PAGE_SIZE;
1688 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1691 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
1694 memset(b_data, 0, PAGE_SIZE);
1695 if (bh->b_data == b_data + PAGE_SIZE) {
1696 bh->b_size += PAGE_SIZE;
1697 bh->b_data -= PAGE_SIZE;
1699 atomic_add(PAGE_SIZE, &bh->b_count);
1702 if (b_data == bh->b_data + bh->b_size) {
1703 bh->b_size += PAGE_SIZE;
1705 atomic_add(PAGE_SIZE, &bh->b_count);
1709 if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) {
1710 free_page((unsigned long) b_data);
1713 bh->b_reqnext = NULL;
1714 bh->b_data = b_data;
1715 bh->b_size = PAGE_SIZE;
1716 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1717 prev_bh->b_reqnext = bh;
1719 bh->b_size -= tape->excess_bh_size;
1721 atomic_sub(tape->excess_bh_size, &bh->b_count);
1724 __idetape_kfree_stage(stage);
1728 static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
1730 idetape_stage_t *cache_stage = tape->cache_stage;
1732 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1734 if (tape->nr_stages >= tape->max_stages)
1736 if (cache_stage != NULL) {
1737 tape->cache_stage = NULL;
1740 return __idetape_kmalloc_stage(tape, 0, 0);
1743 static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n)
1745 struct idetape_bh *bh = tape->bh;
1751 printk(KERN_ERR "ide-tape: bh == NULL in "
1752 "idetape_copy_stage_from_user\n");
1755 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
1756 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count))
1759 atomic_add(count, &bh->b_count);
1761 if (atomic_read(&bh->b_count) == bh->b_size) {
1764 atomic_set(&bh->b_count, 0);
1771 static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n)
1773 struct idetape_bh *bh = tape->bh;
1779 printk(KERN_ERR "ide-tape: bh == NULL in "
1780 "idetape_copy_stage_to_user\n");
1783 count = min(tape->b_count, n);
1784 if (copy_to_user(buf, tape->b_data, count))
1787 tape->b_data += count;
1788 tape->b_count -= count;
1790 if (!tape->b_count) {
1791 tape->bh = bh = bh->b_reqnext;
1793 tape->b_data = bh->b_data;
1794 tape->b_count = atomic_read(&bh->b_count);
1801 static void idetape_init_merge_stage (idetape_tape_t *tape)
1803 struct idetape_bh *bh = tape->merge_stage->bh;
1806 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1807 atomic_set(&bh->b_count, 0);
1809 tape->b_data = bh->b_data;
1810 tape->b_count = atomic_read(&bh->b_count);
1814 static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
1816 struct idetape_bh *tmp;
1819 stage->bh = tape->merge_stage->bh;
1820 tape->merge_stage->bh = tmp;
1821 idetape_init_merge_stage(tape);
1824 /* Add a new stage at the end of the pipeline. */
1825 static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
1827 idetape_tape_t *tape = drive->driver_data;
1828 unsigned long flags;
1830 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1832 spin_lock_irqsave(&tape->lock, flags);
1834 if (tape->last_stage != NULL)
1835 tape->last_stage->next=stage;
1837 tape->first_stage = tape->next_stage=stage;
1838 tape->last_stage = stage;
1839 if (tape->next_stage == NULL)
1840 tape->next_stage = tape->last_stage;
1842 tape->nr_pending_stages++;
1843 spin_unlock_irqrestore(&tape->lock, flags);
1846 /* Install a completion in a pending request and sleep until it is serviced. The
1847 * caller should ensure that the request will not be serviced before we install
1848 * the completion (usually by disabling interrupts).
1850 static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
1852 DECLARE_COMPLETION_ONSTACK(wait);
1853 idetape_tape_t *tape = drive->driver_data;
1855 if (rq == NULL || !blk_special_request(rq)) {
1856 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
1859 rq->end_io_data = &wait;
1860 rq->end_io = blk_end_sync_rq;
1861 spin_unlock_irq(&tape->lock);
1862 wait_for_completion(&wait);
1863 /* The stage and its struct request have been deallocated */
1864 spin_lock_irq(&tape->lock);
1867 static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive)
1869 idetape_tape_t *tape = drive->driver_data;
1870 u8 *readpos = tape->pc->buffer;
1872 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1874 if (!tape->pc->error) {
1875 debug_log(DBG_SENSE, "BOP - %s\n",
1876 (readpos[0] & 0x80) ? "Yes" : "No");
1877 debug_log(DBG_SENSE, "EOP - %s\n",
1878 (readpos[0] & 0x40) ? "Yes" : "No");
1880 if (readpos[0] & 0x4) {
1881 printk(KERN_INFO "ide-tape: Block location is unknown"
1883 clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
1884 idetape_end_request(drive, 0, 0);
1886 debug_log(DBG_SENSE, "Block Location - %u\n",
1887 be32_to_cpu(*(u32 *)&readpos[4]));
1889 tape->partition = readpos[1];
1891 be32_to_cpu(*(u32 *)&readpos[4]);
1892 set_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
1893 idetape_end_request(drive, 1, 0);
1896 idetape_end_request(drive, 0, 0);
1902 * Write a filemark if write_filemark=1. Flush the device buffers without
1903 * writing a filemark otherwise.
1905 static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark)
1907 idetape_init_pc(pc);
1908 pc->c[0] = WRITE_FILEMARKS;
1909 pc->c[4] = write_filemark;
1910 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
1911 pc->callback = &idetape_pc_callback;
1914 static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc)
1916 idetape_init_pc(pc);
1917 pc->c[0] = TEST_UNIT_READY;
1918 pc->callback = &idetape_pc_callback;
1922 * We add a special packet command request to the tail of the request queue, and
1923 * wait for it to be serviced. This is not to be called from within the request
1924 * handling part of the driver! We allocate here data on the stack and it is
1925 * valid until the request is finished. This is not the case for the bottom part
1926 * of the driver, where we are always leaving the functions to wait for an
1927 * interrupt or a timer event.
1929 * From the bottom part of the driver, we should allocate safe memory using
1930 * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request
1931 * to the request list without waiting for it to be serviced! In that case, we
1932 * usually use idetape_queue_pc_head().
1934 static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc)
1936 struct ide_tape_obj *tape = drive->driver_data;
1939 idetape_init_rq(&rq, REQ_IDETAPE_PC1);
1940 rq.buffer = (char *) pc;
1941 rq.rq_disk = tape->disk;
1942 return ide_do_drive_cmd(drive, &rq, ide_wait);
1945 static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd)
1947 idetape_init_pc(pc);
1948 pc->c[0] = START_STOP;
1950 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
1951 pc->callback = &idetape_pc_callback;
1954 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1956 idetape_tape_t *tape = drive->driver_data;
1958 int load_attempted = 0;
1960 /* Wait for the tape to become ready */
1961 set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
1963 while (time_before(jiffies, timeout)) {
1964 idetape_create_test_unit_ready_cmd(&pc);
1965 if (!__idetape_queue_pc_tail(drive, &pc))
1967 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1968 || (tape->asc == 0x3A)) {
1972 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
1973 __idetape_queue_pc_tail(drive, &pc);
1975 /* not about to be ready */
1976 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1977 (tape->ascq == 1 || tape->ascq == 8)))
1984 static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
1986 return __idetape_queue_pc_tail(drive, pc);
1989 static int idetape_flush_tape_buffers (ide_drive_t *drive)
1994 idetape_create_write_filemark_cmd(drive, &pc, 0);
1995 if ((rc = idetape_queue_pc_tail(drive, &pc)))
1997 idetape_wait_ready(drive, 60 * 5 * HZ);
2001 static void idetape_create_read_position_cmd (idetape_pc_t *pc)
2003 idetape_init_pc(pc);
2004 pc->c[0] = READ_POSITION;
2005 pc->request_transfer = 20;
2006 pc->callback = &idetape_read_position_callback;
2009 static int idetape_read_position (ide_drive_t *drive)
2011 idetape_tape_t *tape = drive->driver_data;
2015 debug_log(DBG_PROCS, "Enter %s\n", __func__);
2017 idetape_create_read_position_cmd(&pc);
2018 if (idetape_queue_pc_tail(drive, &pc))
2020 position = tape->first_frame;
2024 static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip)
2026 idetape_init_pc(pc);
2027 pc->c[0] = POSITION_TO_ELEMENT;
2029 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
2030 pc->c[8] = partition;
2031 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2032 pc->callback = &idetape_pc_callback;
2035 static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent)
2037 idetape_tape_t *tape = drive->driver_data;
2039 /* device supports locking according to capabilities page */
2040 if (!(tape->caps[6] & 0x01))
2043 idetape_init_pc(pc);
2044 pc->c[0] = ALLOW_MEDIUM_REMOVAL;
2046 pc->callback = &idetape_pc_callback;
2050 static int __idetape_discard_read_pipeline (ide_drive_t *drive)
2052 idetape_tape_t *tape = drive->driver_data;
2053 unsigned long flags;
2056 if (tape->chrdev_dir != IDETAPE_DIR_READ)
2059 /* Remove merge stage. */
2060 cnt = tape->merge_stage_size / tape->blk_size;
2061 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
2062 ++cnt; /* Filemarks count as 1 sector */
2063 tape->merge_stage_size = 0;
2064 if (tape->merge_stage != NULL) {
2065 __idetape_kfree_stage(tape->merge_stage);
2066 tape->merge_stage = NULL;
2069 /* Clear pipeline flags. */
2070 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
2071 tape->chrdev_dir = IDETAPE_DIR_NONE;
2073 /* Remove pipeline stages. */
2074 if (tape->first_stage == NULL)
2077 spin_lock_irqsave(&tape->lock, flags);
2078 tape->next_stage = NULL;
2079 if (idetape_pipeline_active(tape))
2080 idetape_wait_for_request(drive, tape->active_data_rq);
2081 spin_unlock_irqrestore(&tape->lock, flags);
2083 while (tape->first_stage != NULL) {
2084 struct request *rq_ptr = &tape->first_stage->rq;
2086 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
2087 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
2089 idetape_remove_stage_head(drive);
2091 tape->nr_pending_stages = 0;
2092 tape->max_stages = tape->min_pipeline;
2097 * Position the tape to the requested block using the LOCATE packet command.
2098 * A READ POSITION command is then issued to check where we are positioned. Like
2099 * all higher level operations, we queue the commands at the tail of the request
2100 * queue and wait for their completion.
2102 static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip)
2104 idetape_tape_t *tape = drive->driver_data;
2108 if (tape->chrdev_dir == IDETAPE_DIR_READ)
2109 __idetape_discard_read_pipeline(drive);
2110 idetape_wait_ready(drive, 60 * 5 * HZ);
2111 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
2112 retval = idetape_queue_pc_tail(drive, &pc);
2116 idetape_create_read_position_cmd(&pc);
2117 return (idetape_queue_pc_tail(drive, &pc));
2120 static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position)
2122 idetape_tape_t *tape = drive->driver_data;
2126 cnt = __idetape_discard_read_pipeline(drive);
2127 if (restore_position) {
2128 position = idetape_read_position(drive);
2129 seek = position > cnt ? position - cnt : 0;
2130 if (idetape_position_tape(drive, seek, 0, 0)) {
2131 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name);
2138 * Generate a read/write request for the block device interface and wait for it
2141 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh)
2143 idetape_tape_t *tape = drive->driver_data;
2146 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
2148 if (idetape_pipeline_active(tape)) {
2149 printk(KERN_ERR "ide-tape: bug: the pipeline is active in %s\n",
2154 idetape_init_rq(&rq, cmd);
2155 rq.rq_disk = tape->disk;
2156 rq.special = (void *)bh;
2157 rq.sector = tape->first_frame;
2158 rq.nr_sectors = rq.current_nr_sectors = blocks;
2159 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
2161 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
2164 if (tape->merge_stage)
2165 idetape_init_merge_stage(tape);
2166 if (rq.errors == IDETAPE_ERROR_GENERAL)
2168 return (tape->blk_size * (blocks-rq.current_nr_sectors));
2171 /* start servicing the pipeline stages, starting from tape->next_stage. */
2172 static void idetape_plug_pipeline(ide_drive_t *drive)
2174 idetape_tape_t *tape = drive->driver_data;
2176 if (tape->next_stage == NULL)
2178 if (!idetape_pipeline_active(tape)) {
2179 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
2180 idetape_activate_next_stage(drive);
2181 (void) ide_do_drive_cmd(drive, tape->active_data_rq, ide_end);
2185 static void idetape_create_inquiry_cmd (idetape_pc_t *pc)
2187 idetape_init_pc(pc);
2189 pc->c[4] = pc->request_transfer = 254;
2190 pc->callback = &idetape_pc_callback;
2193 static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
2195 idetape_init_pc(pc);
2196 pc->c[0] = REZERO_UNIT;
2197 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2198 pc->callback = &idetape_pc_callback;
2201 static void idetape_create_erase_cmd (idetape_pc_t *pc)
2203 idetape_init_pc(pc);
2206 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2207 pc->callback = &idetape_pc_callback;
2210 static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd)
2212 idetape_init_pc(pc);
2214 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
2216 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2217 pc->callback = &idetape_pc_callback;
2220 static void idetape_wait_first_stage (ide_drive_t *drive)
2222 idetape_tape_t *tape = drive->driver_data;
2223 unsigned long flags;
2225 if (tape->first_stage == NULL)
2227 spin_lock_irqsave(&tape->lock, flags);
2228 if (tape->active_stage == tape->first_stage)
2229 idetape_wait_for_request(drive, tape->active_data_rq);
2230 spin_unlock_irqrestore(&tape->lock, flags);
2234 * Try to add a character device originated write request to our pipeline. In
2235 * case we don't succeed, we revert to non-pipelined operation mode for this
2236 * request. In order to accomplish that, we
2238 * 1. Try to allocate a new pipeline stage.
2239 * 2. If we can't, wait for more and more requests to be serviced and try again
2241 * 3. If we still can't allocate a stage, fallback to non-pipelined operation
2242 * mode for this request.
2244 static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
2246 idetape_tape_t *tape = drive->driver_data;
2247 idetape_stage_t *new_stage;
2248 unsigned long flags;
2251 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2253 /* Attempt to allocate a new stage. Beware possible race conditions. */
2254 while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
2255 spin_lock_irqsave(&tape->lock, flags);
2256 if (idetape_pipeline_active(tape)) {
2257 idetape_wait_for_request(drive, tape->active_data_rq);
2258 spin_unlock_irqrestore(&tape->lock, flags);
2260 spin_unlock_irqrestore(&tape->lock, flags);
2261 idetape_plug_pipeline(drive);
2262 if (idetape_pipeline_active(tape))
2265 * The machine is short on memory. Fallback to non-
2266 * pipelined operation mode for this request.
2268 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
2271 rq = &new_stage->rq;
2272 idetape_init_rq(rq, REQ_IDETAPE_WRITE);
2273 /* Doesn't actually matter - We always assume sequential access */
2274 rq->sector = tape->first_frame;
2275 rq->nr_sectors = rq->current_nr_sectors = blocks;
2277 idetape_switch_buffers(tape, new_stage);
2278 idetape_add_stage_tail(drive, new_stage);
2279 tape->pipeline_head++;
2280 idetape_calculate_speeds(drive);
2283 * Estimate whether the tape has stopped writing by checking if our
2284 * write pipeline is currently empty. If we are not writing anymore,
2285 * wait for the pipeline to be almost completely full (90%) before
2286 * starting to service requests, so that we will be able to keep up with
2287 * the higher speeds of the tape.
2289 if (!idetape_pipeline_active(tape)) {
2290 if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
2291 tape->nr_stages >= tape->max_stages -
2292 tape->uncontrolled_pipeline_head_speed * 3 * 1024 /
2294 tape->measure_insert_time = 1;
2295 tape->insert_time = jiffies;
2296 tape->insert_size = 0;
2297 tape->insert_speed = 0;
2298 idetape_plug_pipeline(drive);
2301 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
2302 /* Return a deferred error */
2308 * Wait until all pending pipeline requests are serviced. Typically called on
2311 static void idetape_wait_for_pipeline (ide_drive_t *drive)
2313 idetape_tape_t *tape = drive->driver_data;
2314 unsigned long flags;
2316 while (tape->next_stage || idetape_pipeline_active(tape)) {
2317 idetape_plug_pipeline(drive);
2318 spin_lock_irqsave(&tape->lock, flags);
2319 if (idetape_pipeline_active(tape))
2320 idetape_wait_for_request(drive, tape->active_data_rq);
2321 spin_unlock_irqrestore(&tape->lock, flags);
2325 static void idetape_empty_write_pipeline (ide_drive_t *drive)
2327 idetape_tape_t *tape = drive->driver_data;
2329 struct idetape_bh *bh;
2331 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
2332 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
2335 if (tape->merge_stage_size > tape->stage_size) {
2336 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
2337 tape->merge_stage_size = tape->stage_size;
2339 if (tape->merge_stage_size) {
2340 blocks = tape->merge_stage_size / tape->blk_size;
2341 if (tape->merge_stage_size % tape->blk_size) {
2345 i = tape->blk_size - tape->merge_stage_size %
2347 bh = tape->bh->b_reqnext;
2349 atomic_set(&bh->b_count, 0);
2356 printk(KERN_INFO "ide-tape: bug, bh NULL\n");
2359 min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count)));
2360 memset(bh->b_data + atomic_read(&bh->b_count), 0, min);
2361 atomic_add(min, &bh->b_count);
2366 (void) idetape_add_chrdev_write_request(drive, blocks);
2367 tape->merge_stage_size = 0;
2369 idetape_wait_for_pipeline(drive);
2370 if (tape->merge_stage != NULL) {
2371 __idetape_kfree_stage(tape->merge_stage);
2372 tape->merge_stage = NULL;
2374 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
2375 tape->chrdev_dir = IDETAPE_DIR_NONE;
2378 * On the next backup, perform the feedback loop again. (I don't want to
2379 * keep sense information between backups, as some systems are
2380 * constantly on, and the system load can be totally different on the
2383 tape->max_stages = tape->min_pipeline;
2384 if (tape->first_stage != NULL ||
2385 tape->next_stage != NULL ||
2386 tape->last_stage != NULL ||
2387 tape->nr_stages != 0) {
2388 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
2389 "first_stage %p, next_stage %p, "
2390 "last_stage %p, nr_stages %d\n",
2391 tape->first_stage, tape->next_stage,
2392 tape->last_stage, tape->nr_stages);
2396 static void idetape_restart_speed_control (ide_drive_t *drive)
2398 idetape_tape_t *tape = drive->driver_data;
2400 tape->restart_speed_control_req = 0;
2401 tape->pipeline_head = 0;
2402 tape->controlled_last_pipeline_head = 0;
2403 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0;
2404 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000;
2405 tape->uncontrolled_pipeline_head_speed = 0;
2406 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies;
2407 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies;
2410 static int idetape_init_read(ide_drive_t *drive, int max_stages)
2412 idetape_tape_t *tape = drive->driver_data;
2413 idetape_stage_t *new_stage;
2416 u16 blocks = *(u16 *)&tape->caps[12];
2418 /* Initialize read operation */
2419 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
2420 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
2421 idetape_empty_write_pipeline(drive);
2422 idetape_flush_tape_buffers(drive);
2424 if (tape->merge_stage || tape->merge_stage_size) {
2425 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
2426 tape->merge_stage_size = 0;
2428 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
2430 tape->chrdev_dir = IDETAPE_DIR_READ;
2433 * Issue a read 0 command to ensure that DSC handshake is
2434 * switched from completion mode to buffer available mode.
2435 * No point in issuing this if DSC overlap isn't supported, some
2436 * drives (Seagate STT3401A) will return an error.
2438 if (drive->dsc_overlap) {
2439 bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
2440 if (bytes_read < 0) {
2441 __idetape_kfree_stage(tape->merge_stage);
2442 tape->merge_stage = NULL;
2443 tape->chrdev_dir = IDETAPE_DIR_NONE;
2448 if (tape->restart_speed_control_req)
2449 idetape_restart_speed_control(drive);
2450 idetape_init_rq(&rq, REQ_IDETAPE_READ);
2451 rq.sector = tape->first_frame;
2452 rq.nr_sectors = rq.current_nr_sectors = blocks;
2453 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) &&
2454 tape->nr_stages < max_stages) {
2455 new_stage = idetape_kmalloc_stage(tape);
2456 while (new_stage != NULL) {
2458 idetape_add_stage_tail(drive, new_stage);
2459 if (tape->nr_stages >= max_stages)
2461 new_stage = idetape_kmalloc_stage(tape);
2464 if (!idetape_pipeline_active(tape)) {
2465 if (tape->nr_pending_stages >= 3 * max_stages / 4) {
2466 tape->measure_insert_time = 1;
2467 tape->insert_time = jiffies;
2468 tape->insert_size = 0;
2469 tape->insert_speed = 0;
2470 idetape_plug_pipeline(drive);
2477 * Called from idetape_chrdev_read() to service a character device read request
2478 * and add read-ahead requests to our pipeline.
2480 static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
2482 idetape_tape_t *tape = drive->driver_data;
2483 unsigned long flags;
2484 struct request *rq_ptr;
2487 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
2489 /* If we are at a filemark, return a read length of 0 */
2490 if (test_bit(IDETAPE_FILEMARK, &tape->flags))
2493 /* Wait for the next block to reach the head of the pipeline. */
2494 idetape_init_read(drive, tape->max_stages);
2495 if (tape->first_stage == NULL) {
2496 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
2498 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
2499 tape->merge_stage->bh);
2501 idetape_wait_first_stage(drive);
2502 rq_ptr = &tape->first_stage->rq;
2503 bytes_read = tape->blk_size * (rq_ptr->nr_sectors -
2504 rq_ptr->current_nr_sectors);
2505 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
2508 if (rq_ptr->errors == IDETAPE_ERROR_EOD)
2511 idetape_switch_buffers(tape, tape->first_stage);
2512 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
2513 set_bit(IDETAPE_FILEMARK, &tape->flags);
2514 spin_lock_irqsave(&tape->lock, flags);
2515 idetape_remove_stage_head(drive);
2516 spin_unlock_irqrestore(&tape->lock, flags);
2517 tape->pipeline_head++;
2518 idetape_calculate_speeds(drive);
2520 if (bytes_read > blocks * tape->blk_size) {
2521 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
2522 bytes_read = blocks * tape->blk_size;
2524 return (bytes_read);
2527 static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
2529 idetape_tape_t *tape = drive->driver_data;
2530 struct idetape_bh *bh;
2536 bh = tape->merge_stage->bh;
2537 count = min(tape->stage_size, bcount);
2539 blocks = count / tape->blk_size;
2541 atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size));
2542 memset(bh->b_data, 0, atomic_read(&bh->b_count));
2543 count -= atomic_read(&bh->b_count);
2546 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
2550 static int idetape_pipeline_size (ide_drive_t *drive)
2552 idetape_tape_t *tape = drive->driver_data;
2553 idetape_stage_t *stage;
2557 idetape_wait_for_pipeline(drive);
2558 stage = tape->first_stage;
2559 while (stage != NULL) {
2561 size += tape->blk_size * (rq->nr_sectors -
2562 rq->current_nr_sectors);
2563 if (rq->errors == IDETAPE_ERROR_FILEMARK)
2564 size += tape->blk_size;
2565 stage = stage->next;
2567 size += tape->merge_stage_size;
2572 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
2573 * currently support only one partition.
2575 static int idetape_rewind_tape (ide_drive_t *drive)
2579 idetape_tape_t *tape;
2580 tape = drive->driver_data;
2582 debug_log(DBG_SENSE, "Enter %s\n", __func__);
2584 idetape_create_rewind_cmd(drive, &pc);
2585 retval = idetape_queue_pc_tail(drive, &pc);
2589 idetape_create_read_position_cmd(&pc);
2590 retval = idetape_queue_pc_tail(drive, &pc);
2596 /* mtio.h compatible commands should be issued to the chrdev interface. */
2597 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg)
2599 idetape_tape_t *tape = drive->driver_data;
2600 void __user *argp = (void __user *)arg;
2602 struct idetape_config {
2603 int dsc_rw_frequency;
2604 int dsc_media_access_frequency;
2608 debug_log(DBG_PROCS, "Enter %s\n", __func__);
2612 if (copy_from_user(&config, argp, sizeof(config)))
2614 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
2615 tape->max_stages = config.nr_stages;
2618 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
2619 config.nr_stages = tape->max_stages;
2620 if (copy_to_user(argp, &config, sizeof(config)))
2630 * The function below is now a bit more complicated than just passing the
2631 * command to the tape since we may have crossed some filemarks during our
2632 * pipelined read-ahead mode. As a minor side effect, the pipeline enables us to
2633 * support MTFSFM when the filemark is in our internal pipeline even if the tape
2634 * doesn't support spacing over filemarks in the reverse direction.
2636 static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
2638 idetape_tape_t *tape = drive->driver_data;
2640 unsigned long flags;
2642 int sprev = !!(tape->caps[4] & 0x20);
2646 if (MTBSF == mt_op || MTBSFM == mt_op) {
2649 mt_count = - mt_count;
2652 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2653 /* its a read-ahead buffer, scan it for crossed filemarks. */
2654 tape->merge_stage_size = 0;
2655 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
2657 while (tape->first_stage != NULL) {
2658 if (count == mt_count) {
2659 if (mt_op == MTFSFM)
2660 set_bit(IDETAPE_FILEMARK, &tape->flags);
2663 spin_lock_irqsave(&tape->lock, flags);
2664 if (tape->first_stage == tape->active_stage) {
2666 * We have reached the active stage in the read
2667 * pipeline. There is no point in allowing the
2668 * drive to continue reading any farther, so we
2669 * stop the pipeline.
2671 * This section should be moved to a separate
2672 * subroutine because similar operations are
2673 * done in __idetape_discard_read_pipeline(),
2676 tape->next_stage = NULL;
2677 spin_unlock_irqrestore(&tape->lock, flags);
2678 idetape_wait_first_stage(drive);
2679 tape->next_stage = tape->first_stage->next;
2681 spin_unlock_irqrestore(&tape->lock, flags);
2682 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
2684 idetape_remove_stage_head(drive);
2686 idetape_discard_read_pipeline(drive, 0);
2690 * The filemark was not found in our internal pipeline; now we can issue
2691 * the space command.
2696 idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
2697 return (idetape_queue_pc_tail(drive, &pc));
2702 retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count);
2703 if (retval) return (retval);
2704 count = (MTBSFM == mt_op ? 1 : -1);
2705 return (idetape_space_over_filemarks(drive, MTFSF, count));
2707 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
2714 * Our character device read / write functions.
2716 * The tape is optimized to maximize throughput when it is transferring an
2717 * integral number of the "continuous transfer limit", which is a parameter of
2718 * the specific tape (26kB on my particular tape, 32kB for Onstream).
2720 * As of version 1.3 of the driver, the character device provides an abstract
2721 * continuous view of the media - any mix of block sizes (even 1 byte) on the
2722 * same backup/restore procedure is supported. The driver will internally
2723 * convert the requests to the recommended transfer unit, so that an unmatch
2724 * between the user's block size to the recommended size will only result in a
2725 * (slightly) increased driver overhead, but will no longer hit performance.
2726 * This is not applicable to Onstream.
2728 static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
2729 size_t count, loff_t *ppos)
2731 struct ide_tape_obj *tape = ide_tape_f(file);
2732 ide_drive_t *drive = tape->drive;
2733 ssize_t bytes_read,temp, actually_read = 0, rc;
2735 u16 ctl = *(u16 *)&tape->caps[12];
2737 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
2739 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
2740 if (test_bit(IDETAPE_DETECT_BS, &tape->flags))
2741 if (count > tape->blk_size &&
2742 (count % tape->blk_size) == 0)
2743 tape->user_bs_factor = count / tape->blk_size;
2745 rc = idetape_init_read(drive, tape->max_stages);
2750 if (tape->merge_stage_size) {
2751 actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count);
2752 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read))
2754 buf += actually_read;
2755 tape->merge_stage_size -= actually_read;
2756 count -= actually_read;
2758 while (count >= tape->stage_size) {
2759 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
2760 if (bytes_read <= 0)
2762 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read))
2765 count -= bytes_read;
2766 actually_read += bytes_read;
2769 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
2770 if (bytes_read <= 0)
2772 temp = min((unsigned long)count, (unsigned long)bytes_read);
2773 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp))
2775 actually_read += temp;
2776 tape->merge_stage_size = bytes_read-temp;
2779 if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) {
2780 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
2782 idetape_space_over_filemarks(drive, MTFSF, 1);
2786 return (ret) ? ret : actually_read;
2789 static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
2790 size_t count, loff_t *ppos)
2792 struct ide_tape_obj *tape = ide_tape_f(file);
2793 ide_drive_t *drive = tape->drive;
2794 ssize_t actually_written = 0;
2796 u16 ctl = *(u16 *)&tape->caps[12];
2798 /* The drive is write protected. */
2799 if (tape->write_prot)
2802 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
2804 /* Initialize write operation */
2805 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
2806 if (tape->chrdev_dir == IDETAPE_DIR_READ)
2807 idetape_discard_read_pipeline(drive, 1);
2808 if (tape->merge_stage || tape->merge_stage_size) {
2809 printk(KERN_ERR "ide-tape: merge_stage_size "
2810 "should be 0 now\n");
2811 tape->merge_stage_size = 0;
2813 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
2815 tape->chrdev_dir = IDETAPE_DIR_WRITE;
2816 idetape_init_merge_stage(tape);
2819 * Issue a write 0 command to ensure that DSC handshake is
2820 * switched from completion mode to buffer available mode. No
2821 * point in issuing this if DSC overlap isn't supported, some
2822 * drives (Seagate STT3401A) will return an error.
2824 if (drive->dsc_overlap) {
2825 ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
2827 __idetape_kfree_stage(tape->merge_stage);
2828 tape->merge_stage = NULL;
2829 tape->chrdev_dir = IDETAPE_DIR_NONE;
2836 if (tape->restart_speed_control_req)
2837 idetape_restart_speed_control(drive);
2838 if (tape->merge_stage_size) {
2839 if (tape->merge_stage_size >= tape->stage_size) {
2840 printk(KERN_ERR "ide-tape: bug: merge buffer too big\n");
2841 tape->merge_stage_size = 0;
2843 actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count);
2844 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written))
2846 buf += actually_written;
2847 tape->merge_stage_size += actually_written;
2848 count -= actually_written;
2850 if (tape->merge_stage_size == tape->stage_size) {
2852 tape->merge_stage_size = 0;
2853 retval = idetape_add_chrdev_write_request(drive, ctl);
2858 while (count >= tape->stage_size) {
2860 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size))
2862 buf += tape->stage_size;
2863 count -= tape->stage_size;
2864 retval = idetape_add_chrdev_write_request(drive, ctl);
2865 actually_written += tape->stage_size;
2870 actually_written += count;
2871 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count))
2873 tape->merge_stage_size += count;
2875 return (ret) ? ret : actually_written;
2878 static int idetape_write_filemark (ide_drive_t *drive)
2882 /* Write a filemark */
2883 idetape_create_write_filemark_cmd(drive, &pc, 1);
2884 if (idetape_queue_pc_tail(drive, &pc)) {
2885 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
2892 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
2895 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
2896 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
2897 * usually not supported (it is supported in the rare case in which we crossed
2898 * the filemark during our read-ahead pipelined operation mode).
2900 * The following commands are currently not supported:
2902 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
2903 * MT_ST_WRITE_THRESHOLD.
2905 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
2907 idetape_tape_t *tape = drive->driver_data;
2911 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
2913 /* Commands which need our pipelined read-ahead stages. */
2921 return (idetape_space_over_filemarks(drive,mt_op,mt_count));
2927 if (tape->write_prot)
2929 idetape_discard_read_pipeline(drive, 1);
2930 for (i = 0; i < mt_count; i++) {
2931 retval = idetape_write_filemark(drive);
2937 idetape_discard_read_pipeline(drive, 0);
2938 if (idetape_rewind_tape(drive))
2942 idetape_discard_read_pipeline(drive, 0);
2943 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
2944 return (idetape_queue_pc_tail(drive, &pc));
2948 * If door is locked, attempt to unlock before
2949 * attempting to eject.
2951 if (tape->door_locked) {
2952 if (idetape_create_prevent_cmd(drive, &pc, 0))
2953 if (!idetape_queue_pc_tail(drive, &pc))
2954 tape->door_locked = DOOR_UNLOCKED;
2956 idetape_discard_read_pipeline(drive, 0);
2957 idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK);
2958 retval = idetape_queue_pc_tail(drive, &pc);
2960 clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
2963 idetape_discard_read_pipeline(drive, 0);
2964 return (idetape_flush_tape_buffers(drive));
2966 idetape_discard_read_pipeline(drive, 0);
2967 idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
2968 return (idetape_queue_pc_tail(drive, &pc));
2970 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
2971 return (idetape_queue_pc_tail(drive, &pc));
2973 (void) idetape_rewind_tape(drive);
2974 idetape_create_erase_cmd(&pc);
2975 return (idetape_queue_pc_tail(drive, &pc));
2978 if (mt_count < tape->blk_size ||
2979 mt_count % tape->blk_size)
2981 tape->user_bs_factor = mt_count /
2983 clear_bit(IDETAPE_DETECT_BS, &tape->flags);
2985 set_bit(IDETAPE_DETECT_BS, &tape->flags);
2988 idetape_discard_read_pipeline(drive, 0);
2989 return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0);
2991 idetape_discard_read_pipeline(drive, 0);
2992 return (idetape_position_tape(drive, 0, mt_count, 0));
2996 if (!idetape_create_prevent_cmd(drive, &pc, 1))
2998 retval = idetape_queue_pc_tail(drive, &pc);
2999 if (retval) return retval;
3000 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
3003 if (!idetape_create_prevent_cmd(drive, &pc, 0))
3005 retval = idetape_queue_pc_tail(drive, &pc);
3006 if (retval) return retval;
3007 tape->door_locked = DOOR_UNLOCKED;
3010 printk(KERN_ERR "ide-tape: MTIO operation %d not "
3011 "supported\n", mt_op);
3017 * Our character device ioctls. General mtio.h magnetic io commands are
3018 * supported here, and not in the corresponding block interface. Our own
3019 * ide-tape ioctls are supported on both interfaces.
3021 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
3022 unsigned int cmd, unsigned long arg)
3024 struct ide_tape_obj *tape = ide_tape_f(file);
3025 ide_drive_t *drive = tape->drive;
3029 int block_offset = 0, position = tape->first_frame;
3030 void __user *argp = (void __user *)arg;
3032 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
3034 tape->restart_speed_control_req = 1;
3035 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
3036 idetape_empty_write_pipeline(drive);
3037 idetape_flush_tape_buffers(drive);
3039 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
3040 block_offset = idetape_pipeline_size(drive) /
3041 (tape->blk_size * tape->user_bs_factor);
3042 if ((position = idetape_read_position(drive)) < 0)
3047 if (copy_from_user(&mtop, argp, sizeof (struct mtop)))
3049 return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count));
3051 memset(&mtget, 0, sizeof (struct mtget));
3052 mtget.mt_type = MT_ISSCSI2;
3053 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
3055 ((tape->blk_size * tape->user_bs_factor)
3056 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
3058 if (tape->drv_write_prot) {
3059 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
3061 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
3065 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
3066 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
3070 if (tape->chrdev_dir == IDETAPE_DIR_READ)
3071 idetape_discard_read_pipeline(drive, 1);
3072 return idetape_blkdev_ioctl(drive, cmd, arg);
3077 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
3078 * block size with the reported value.
3080 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
3082 idetape_tape_t *tape = drive->driver_data;
3085 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
3086 if (idetape_queue_pc_tail(drive, &pc)) {
3087 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
3088 if (tape->blk_size == 0) {
3089 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
3090 "block size, assuming 32k\n");
3091 tape->blk_size = 32768;
3095 tape->blk_size = (pc.buffer[4 + 5] << 16) +
3096 (pc.buffer[4 + 6] << 8) +
3098 tape->drv_write_prot = (pc.buffer[2] & 0x80) >> 7;
3101 static int idetape_chrdev_open (struct inode *inode, struct file *filp)
3103 unsigned int minor = iminor(inode), i = minor & ~0xc0;
3105 idetape_tape_t *tape;
3109 if (i >= MAX_HWIFS * MAX_DRIVES)
3112 tape = ide_tape_chrdev_get(i);
3116 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
3119 * We really want to do nonseekable_open(inode, filp); here, but some
3120 * versions of tar incorrectly call lseek on tapes and bail out if that
3121 * fails. So we disallow pread() and pwrite(), but permit lseeks.
3123 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
3125 drive = tape->drive;
3127 filp->private_data = tape;
3129 if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) {
3134 retval = idetape_wait_ready(drive, 60 * HZ);
3136 clear_bit(IDETAPE_BUSY, &tape->flags);
3137 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
3141 idetape_read_position(drive);
3142 if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
3143 (void)idetape_rewind_tape(drive);
3145 if (tape->chrdev_dir != IDETAPE_DIR_READ)
3146 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
3148 /* Read block size and write protect status from drive. */
3149 ide_tape_get_bsize_from_bdesc(drive);
3151 /* Set write protect flag if device is opened as read-only. */
3152 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
3153 tape->write_prot = 1;
3155 tape->write_prot = tape->drv_write_prot;
3157 /* Make sure drive isn't write protected if user wants to write. */
3158 if (tape->write_prot) {
3159 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
3160 (filp->f_flags & O_ACCMODE) == O_RDWR) {
3161 clear_bit(IDETAPE_BUSY, &tape->flags);
3167 /* Lock the tape drive door so user can't eject. */
3168 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
3169 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
3170 if (!idetape_queue_pc_tail(drive, &pc)) {
3171 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
3172 tape->door_locked = DOOR_LOCKED;
3176 idetape_restart_speed_control(drive);
3177 tape->restart_speed_control_req = 0;
3185 static void idetape_write_release (ide_drive_t *drive, unsigned int minor)
3187 idetape_tape_t *tape = drive->driver_data;
3189 idetape_empty_write_pipeline(drive);
3190 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
3191 if (tape->merge_stage != NULL) {
3192 idetape_pad_zeros(drive, tape->blk_size *
3193 (tape->user_bs_factor - 1));
3194 __idetape_kfree_stage(tape->merge_stage);
3195 tape->merge_stage = NULL;
3197 idetape_write_filemark(drive);
3198 idetape_flush_tape_buffers(drive);
3199 idetape_flush_tape_buffers(drive);
3202 static int idetape_chrdev_release (struct inode *inode, struct file *filp)
3204 struct ide_tape_obj *tape = ide_tape_f(filp);
3205 ide_drive_t *drive = tape->drive;
3207 unsigned int minor = iminor(inode);
3210 tape = drive->driver_data;
3212 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
3214 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
3215 idetape_write_release(drive, minor);
3216 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
3218 idetape_discard_read_pipeline(drive, 1);
3220 idetape_wait_for_pipeline(drive);
3222 if (tape->cache_stage != NULL) {
3223 __idetape_kfree_stage(tape->cache_stage);
3224 tape->cache_stage = NULL;
3226 if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags))
3227 (void) idetape_rewind_tape(drive);
3228 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
3229 if (tape->door_locked == DOOR_LOCKED) {
3230 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
3231 if (!idetape_queue_pc_tail(drive, &pc))
3232 tape->door_locked = DOOR_UNLOCKED;
3236 clear_bit(IDETAPE_BUSY, &tape->flags);
3243 * check the contents of the ATAPI IDENTIFY command results. We return:
3245 * 1 - If the tape can be supported by us, based on the information we have so
3248 * 0 - If this tape driver is not currently supported by us.
3250 static int idetape_identify_device(ide_drive_t *drive)
3252 u8 gcw[2], protocol, device_type, removable, packet_size;
3254 if (drive->id_read == 0)
3257 *((unsigned short *) &gcw) = drive->id->config;
3259 protocol = (gcw[1] & 0xC0) >> 6;
3260 device_type = gcw[1] & 0x1F;
3261 removable = !!(gcw[0] & 0x80);
3262 packet_size = gcw[0] & 0x3;
3264 /* Check that we can support this device */
3266 printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n",
3268 else if (device_type != 1)
3269 printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set "
3270 "to tape\n", device_type);
3271 else if (!removable)
3272 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
3273 else if (packet_size != 0) {
3274 printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12 "
3275 "bytes long\n", packet_size);
3281 static void idetape_get_inquiry_results(ide_drive_t *drive)
3283 idetape_tape_t *tape = drive->driver_data;
3285 char fw_rev[6], vendor_id[10], product_id[18];
3287 idetape_create_inquiry_cmd(&pc);
3288 if (idetape_queue_pc_tail(drive, &pc)) {
3289 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
3293 memcpy(vendor_id, &pc.buffer[8], 8);
3294 memcpy(product_id, &pc.buffer[16], 16);
3295 memcpy(fw_rev, &pc.buffer[32], 4);
3297 ide_fixstring(vendor_id, 10, 0);
3298 ide_fixstring(product_id, 18, 0);
3299 ide_fixstring(fw_rev, 6, 0);
3301 printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n",
3302 drive->name, tape->name, vendor_id, product_id, fw_rev);
3306 * Ask the tape about its various parameters. In particular, we will adjust our
3307 * data transfer buffer size to the recommended value as returned by the tape.
3309 static void idetape_get_mode_sense_results (ide_drive_t *drive)
3311 idetape_tape_t *tape = drive->driver_data;
3314 u8 speed, max_speed;
3316 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
3317 if (idetape_queue_pc_tail(drive, &pc)) {
3318 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
3319 " some default values\n");
3320 tape->blk_size = 512;
3321 put_unaligned(52, (u16 *)&tape->caps[12]);
3322 put_unaligned(540, (u16 *)&tape->caps[14]);
3323 put_unaligned(6*52, (u16 *)&tape->caps[16]);
3326 caps = pc.buffer + 4 + pc.buffer[3];
3328 /* convert to host order and save for later use */
3329 speed = be16_to_cpu(*(u16 *)&caps[14]);
3330 max_speed = be16_to_cpu(*(u16 *)&caps[8]);
3332 put_unaligned(max_speed, (u16 *)&caps[8]);
3333 put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]);
3334 put_unaligned(speed, (u16 *)&caps[14]);
3335 put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]);
3338 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
3339 "(assuming 650KB/sec)\n", drive->name);
3340 put_unaligned(650, (u16 *)&caps[14]);
3343 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
3344 "(assuming 650KB/sec)\n", drive->name);
3345 put_unaligned(650, (u16 *)&caps[8]);
3348 memcpy(&tape->caps, caps, 20);
3350 tape->blk_size = 512;
3351 else if (caps[7] & 0x04)
3352 tape->blk_size = 1024;
3355 #ifdef CONFIG_IDE_PROC_FS
3356 static void idetape_add_settings (ide_drive_t *drive)
3358 idetape_tape_t *tape = drive->driver_data;
3360 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
3361 1, 2, (u16 *)&tape->caps[16], NULL);
3362 ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
3363 ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL);
3364 ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
3365 ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL);
3366 ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL);
3367 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
3368 1, 1, (u16 *)&tape->caps[14], NULL);
3369 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1,
3370 1024, &tape->stage_size, NULL);
3371 ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN,
3372 IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq,
3374 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
3375 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL);
3376 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL);
3377 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL);
3378 ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1,
3379 1, &tape->debug_mask, NULL);
3382 static inline void idetape_add_settings(ide_drive_t *drive) { ; }
3386 * The function below is called to:
3388 * 1. Initialize our various state variables.
3389 * 2. Ask the tape for its capabilities.
3390 * 3. Allocate a buffer which will be used for data transfer. The buffer size
3391 * is chosen based on the recommendation which we received in step 2.
3393 * Note that at this point ide.c already assigned us an irq, so that we can
3394 * queue requests here and wait for their completion.
3396 static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
3398 unsigned long t1, tmid, tn, t;
3403 u16 *ctl = (u16 *)&tape->caps[12];
3405 spin_lock_init(&tape->lock);
3406 drive->dsc_overlap = 1;
3407 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
3408 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
3410 drive->dsc_overlap = 0;
3412 /* Seagate Travan drives do not support DSC overlap. */
3413 if (strstr(drive->id->model, "Seagate STT3401"))
3414 drive->dsc_overlap = 0;
3415 tape->minor = minor;
3416 tape->name[0] = 'h';
3417 tape->name[1] = 't';
3418 tape->name[2] = '0' + minor;
3419 tape->chrdev_dir = IDETAPE_DIR_NONE;
3420 tape->pc = tape->pc_stack;
3421 tape->max_insert_speed = 10000;
3422 tape->speed_control = 1;
3423 *((unsigned short *) &gcw) = drive->id->config;
3425 /* Command packet DRQ type */
3426 if (((gcw[0] & 0x60) >> 5) == 1)
3427 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags);
3429 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10;
3431 idetape_get_inquiry_results(drive);
3432 idetape_get_mode_sense_results(drive);
3433 ide_tape_get_bsize_from_bdesc(drive);
3434 tape->user_bs_factor = 1;
3435 tape->stage_size = *ctl * tape->blk_size;
3436 while (tape->stage_size > 0xffff) {
3437 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
3439 tape->stage_size = *ctl * tape->blk_size;
3441 stage_size = tape->stage_size;
3442 tape->pages_per_stage = stage_size / PAGE_SIZE;
3443 if (stage_size % PAGE_SIZE) {
3444 tape->pages_per_stage++;
3445 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
3448 /* Select the "best" DSC read/write polling freq and pipeline size. */
3449 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
3451 tape->max_stages = speed * 1000 * 10 / tape->stage_size;
3453 /* Limit memory use for pipeline to 10% of physical memory */
3455 if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10)
3456 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size);
3457 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
3458 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
3459 tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
3460 if (tape->max_stages == 0)
3461 tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1;
3463 t1 = (tape->stage_size * HZ) / (speed * 1000);
3464 tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125);
3465 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
3467 if (tape->max_stages)
3473 * Ensure that the number we got makes sense; limit it within
3474 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
3476 tape->best_dsc_rw_freq = max_t(unsigned long,
3477 min_t(unsigned long, t, IDETAPE_DSC_RW_MAX),
3478 IDETAPE_DSC_RW_MIN);
3479 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
3480 "%dkB pipeline, %lums tDSC%s\n",
3481 drive->name, tape->name, *(u16 *)&tape->caps[14],
3482 (*(u16 *)&tape->caps[16] * 512) / tape->stage_size,
3483 tape->stage_size / 1024,
3484 tape->max_stages * tape->stage_size / 1024,
3485 tape->best_dsc_rw_freq * 1000 / HZ,
3486 drive->using_dma ? ", DMA":"");
3488 idetape_add_settings(drive);
3491 static void ide_tape_remove(ide_drive_t *drive)
3493 idetape_tape_t *tape = drive->driver_data;
3495 ide_proc_unregister_driver(drive, tape->driver);
3497 ide_unregister_region(tape->disk);
3502 static void ide_tape_release(struct kref *kref)
3504 struct ide_tape_obj *tape = to_ide_tape(kref);
3505 ide_drive_t *drive = tape->drive;
3506 struct gendisk *g = tape->disk;
3508 BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
3510 drive->dsc_overlap = 0;
3511 drive->driver_data = NULL;
3512 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
3513 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128));
3514 idetape_devs[tape->minor] = NULL;
3515 g->private_data = NULL;
3520 #ifdef CONFIG_IDE_PROC_FS
3521 static int proc_idetape_read_name
3522 (char *page, char **start, off_t off, int count, int *eof, void *data)
3524 ide_drive_t *drive = (ide_drive_t *) data;
3525 idetape_tape_t *tape = drive->driver_data;
3529 len = sprintf(out, "%s\n", tape->name);
3530 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
3533 static ide_proc_entry_t idetape_proc[] = {
3534 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
3535 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
3536 { NULL, 0, NULL, NULL }
3540 static int ide_tape_probe(ide_drive_t *);
3542 static ide_driver_t idetape_driver = {
3544 .owner = THIS_MODULE,
3546 .bus = &ide_bus_type,
3548 .probe = ide_tape_probe,
3549 .remove = ide_tape_remove,
3550 .version = IDETAPE_VERSION,
3552 .supports_dsc_overlap = 1,
3553 .do_request = idetape_do_request,
3554 .end_request = idetape_end_request,
3555 .error = __ide_error,
3556 .abort = __ide_abort,
3557 #ifdef CONFIG_IDE_PROC_FS
3558 .proc = idetape_proc,
3562 /* Our character device supporting functions, passed to register_chrdev. */
3563 static const struct file_operations idetape_fops = {
3564 .owner = THIS_MODULE,
3565 .read = idetape_chrdev_read,
3566 .write = idetape_chrdev_write,
3567 .ioctl = idetape_chrdev_ioctl,
3568 .open = idetape_chrdev_open,
3569 .release = idetape_chrdev_release,
3572 static int idetape_open(struct inode *inode, struct file *filp)
3574 struct gendisk *disk = inode->i_bdev->bd_disk;
3575 struct ide_tape_obj *tape;
3577 if (!(tape = ide_tape_get(disk)))
3583 static int idetape_release(struct inode *inode, struct file *filp)
3585 struct gendisk *disk = inode->i_bdev->bd_disk;
3586 struct ide_tape_obj *tape = ide_tape_g(disk);
3593 static int idetape_ioctl(struct inode *inode, struct file *file,
3594 unsigned int cmd, unsigned long arg)
3596 struct block_device *bdev = inode->i_bdev;
3597 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
3598 ide_drive_t *drive = tape->drive;
3599 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
3601 err = idetape_blkdev_ioctl(drive, cmd, arg);
3605 static struct block_device_operations idetape_block_ops = {
3606 .owner = THIS_MODULE,
3607 .open = idetape_open,
3608 .release = idetape_release,
3609 .ioctl = idetape_ioctl,
3612 static int ide_tape_probe(ide_drive_t *drive)
3614 idetape_tape_t *tape;
3618 if (!strstr("ide-tape", drive->driver_req))
3620 if (!drive->present)
3622 if (drive->media != ide_tape)
3624 if (!idetape_identify_device (drive)) {
3625 printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
3629 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name);
3632 if (strstr(drive->id->model, "OnStream DI-")) {
3633 printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name);
3634 printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n");
3636 tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL);
3638 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
3642 g = alloc_disk(1 << PARTN_BITS);
3646 ide_init_disk(g, drive);
3648 ide_proc_register_driver(drive, &idetape_driver);
3650 kref_init(&tape->kref);
3652 tape->drive = drive;
3653 tape->driver = &idetape_driver;
3656 g->private_data = &tape->driver;
3658 drive->driver_data = tape;
3660 mutex_lock(&idetape_ref_mutex);
3661 for (minor = 0; idetape_devs[minor]; minor++)
3663 idetape_devs[minor] = tape;
3664 mutex_unlock(&idetape_ref_mutex);
3666 idetape_setup(drive, tape, minor);
3668 device_create(idetape_sysfs_class, &drive->gendev,
3669 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name);
3670 device_create(idetape_sysfs_class, &drive->gendev,
3671 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name);
3673 g->fops = &idetape_block_ops;
3674 ide_register_region(g);
3684 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
3685 MODULE_LICENSE("GPL");
3687 static void __exit idetape_exit (void)
3689 driver_unregister(&idetape_driver.gen_driver);
3690 class_destroy(idetape_sysfs_class);
3691 unregister_chrdev(IDETAPE_MAJOR, "ht");
3694 static int __init idetape_init(void)
3697 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
3698 if (IS_ERR(idetape_sysfs_class)) {
3699 idetape_sysfs_class = NULL;
3700 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
3705 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
3706 printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
3708 goto out_free_class;
3711 error = driver_register(&idetape_driver.gen_driver);
3713 goto out_free_driver;
3718 driver_unregister(&idetape_driver.gen_driver);
3720 class_destroy(idetape_sysfs_class);
3725 MODULE_ALIAS("ide:*m-tape*");
3726 module_init(idetape_init);
3727 module_exit(idetape_exit);
3728 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);