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
81 * keep the tape constantly streaming. To accomplish that, we implement
82 * a feedback loop around the maximum number of stages:
84 * We start from MIN maximum stages (we will not even use MIN stages
85 * if we don't need them), increment it by RATE*(MAX-MIN)
86 * whenever we sense that the pipeline is empty, until we reach
87 * the optimum value or until we reach MAX.
89 * Setting the following parameter to 0 is illegal: the pipelined mode
90 * cannot be disabled (idetape_calculate_speeds() divides by
93 #define IDETAPE_MIN_PIPELINE_STAGES 1
94 #define IDETAPE_MAX_PIPELINE_STAGES 400
95 #define IDETAPE_INCREASE_STAGES_RATE 20
98 * After each failed packet command we issue a request sense command
99 * and retry the packet command IDETAPE_MAX_PC_RETRIES times.
101 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
103 #define IDETAPE_MAX_PC_RETRIES 3
106 * With each packet command, we allocate a buffer of
107 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
108 * commands (Not for READ/WRITE commands).
110 #define IDETAPE_PC_BUFFER_SIZE 256
113 * In various places in the driver, we need to allocate storage
114 * for packet commands and requests, which will remain valid while
115 * we leave the driver to wait for an interrupt or a timeout event.
117 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
120 * Some drives (for example, Seagate STT3401A Travan) require a very long
121 * timeout, because they don't return an interrupt or clear their busy bit
122 * until after the command completes (even retension commands).
124 #define IDETAPE_WAIT_CMD (900*HZ)
127 * The following parameter is used to select the point in the internal
128 * tape fifo in which we will start to refill the buffer. Decreasing
129 * the following parameter will improve the system's latency and
130 * interactive response, while using a high value might improve system
133 #define IDETAPE_FIFO_THRESHOLD 2
136 * DSC polling parameters.
138 * Polling for DSC (a single bit in the status register) is a very
139 * important function in ide-tape. There are two cases in which we
142 * 1. Before a read/write packet command, to ensure that we
143 * can transfer data from/to the tape's data buffers, without
144 * causing an actual media access. In case the tape is not
145 * ready yet, we take out our request from the device
146 * request queue, so that ide.c will service requests from
147 * the other device on the same interface meanwhile.
149 * 2. After the successful initialization of a "media access
150 * packet command", which is a command which can take a long
151 * time to complete (it can be several seconds or even an hour).
153 * Again, we postpone our request in the middle to free the bus
154 * for the other device. The polling frequency here should be
155 * lower than the read/write frequency since those media access
156 * commands are slow. We start from a "fast" frequency -
157 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
158 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
159 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
161 * We also set a timeout for the timer, in case something goes wrong.
162 * The timeout should be longer then the maximum execution time of a
169 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
170 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
171 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
172 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
173 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
174 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
175 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
177 /*************************** End of tunable parameters ***********************/
180 * Read/Write error simulation
182 #define SIMULATE_ERRORS 0
185 * For general magnetic tape device compatibility.
188 /* tape directions */
190 IDETAPE_DIR_NONE = (1 << 0),
191 IDETAPE_DIR_READ = (1 << 1),
192 IDETAPE_DIR_WRITE = (1 << 2),
198 struct idetape_bh *b_reqnext;
203 * Our view of a packet command.
205 typedef struct idetape_packet_command_s {
206 u8 c[12]; /* Actual packet bytes */
207 int retries; /* On each retry, we increment retries */
208 int error; /* Error code */
209 int request_transfer; /* Bytes to transfer */
210 int actually_transferred; /* Bytes actually transferred */
211 int buffer_size; /* Size of our data buffer */
212 struct idetape_bh *bh;
215 u8 *buffer; /* Data buffer */
216 u8 *current_position; /* Pointer into the above buffer */
217 ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */
218 u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */
219 unsigned long flags; /* Status/Action bit flags: long for set_bit */
223 * Packet command flag bits.
225 /* Set when an error is considered normal - We won't retry */
227 /* 1 When polling for DSC on a media access command */
228 #define PC_WAIT_FOR_DSC 1
229 /* 1 when we prefer to use DMA if possible */
230 #define PC_DMA_RECOMMENDED 2
231 /* 1 while DMA in progress */
232 #define PC_DMA_IN_PROGRESS 3
233 /* 1 when encountered problem during DMA */
234 #define PC_DMA_ERROR 4
241 typedef struct idetape_stage_s {
242 struct request rq; /* The corresponding request */
243 struct idetape_bh *bh; /* The data buffers */
244 struct idetape_stage_s *next; /* Pointer to the next stage */
248 * Most of our global data which we need to save even as we leave the
249 * driver due to an interrupt or a timer event is stored in a variable
250 * of type idetape_tape_t, defined below.
252 typedef struct ide_tape_obj {
254 ide_driver_t *driver;
255 struct gendisk *disk;
259 * Since a typical character device operation requires more
260 * than one packet command, we provide here enough memory
261 * for the maximum of interconnected packet commands.
262 * The packet commands are stored in the circular array pc_stack.
263 * pc_stack_index points to the last used entry, and warps around
264 * to the start when we get to the last array entry.
266 * pc points to the current processed packet command.
268 * failed_pc points to the last failed packet command, or contains
269 * NULL if we do not need to retry any packet command. This is
270 * required since an additional packet command is needed before the
271 * retry, to get detailed information on what went wrong.
273 /* Current packet command */
275 /* Last failed packet command */
276 idetape_pc_t *failed_pc;
277 /* Packet command stack */
278 idetape_pc_t pc_stack[IDETAPE_PC_STACK];
279 /* Next free packet command storage space */
281 struct request rq_stack[IDETAPE_PC_STACK];
282 /* We implement a circular array */
286 * DSC polling variables.
288 * While polling for DSC we use postponed_rq to postpone the
289 * current request so that ide.c will be able to service
290 * pending requests on the other device. Note that at most
291 * we will have only one DSC (usually data transfer) request
292 * in the device request queue. Additional requests can be
293 * queued in our internal pipeline, but they will be visible
294 * to ide.c only one at a time.
296 struct request *postponed_rq;
297 /* The time in which we started polling for DSC */
298 unsigned long dsc_polling_start;
299 /* Timer used to poll for dsc */
300 struct timer_list dsc_timer;
301 /* Read/Write dsc polling frequency */
302 unsigned long best_dsc_rw_freq;
303 unsigned long dsc_poll_freq;
304 unsigned long dsc_timeout;
307 * Read position information
311 unsigned int first_frame;
314 * Last error information
316 u8 sense_key, asc, ascq;
319 * Character device operation
324 /* Current character device data transfer direction */
327 /* tape block size, usually 512 or 1024 bytes */
328 unsigned short blk_size;
331 /* Copy of the tape's Capabilities and Mechanical Page */
335 * Active data transfer request parameters.
337 * At most, there is only one ide-tape originated data transfer
338 * request in the device request queue. This allows ide.c to
339 * easily service requests from the other device when we
340 * postpone our active request. In the pipelined operation
341 * mode, we use our internal pipeline structure to hold
342 * more data requests.
344 * The data buffer size is chosen based on the tape's
347 /* Ptr to the request which is waiting in the device request queue */
348 struct request *active_data_rq;
349 /* Data buffer size (chosen based on the tape's recommendation */
351 idetape_stage_t *merge_stage;
352 int merge_stage_size;
353 struct idetape_bh *bh;
358 * Pipeline parameters.
360 * To accomplish non-pipelined mode, we simply set the following
361 * variables to zero (or NULL, where appropriate).
363 /* Number of currently used stages */
365 /* Number of pending stages */
366 int nr_pending_stages;
367 /* We will not allocate more than this number of stages */
368 int max_stages, min_pipeline, max_pipeline;
369 /* The first stage which will be removed from the pipeline */
370 idetape_stage_t *first_stage;
371 /* The currently active stage */
372 idetape_stage_t *active_stage;
373 /* Will be serviced after the currently active request */
374 idetape_stage_t *next_stage;
375 /* New requests will be added to the pipeline here */
376 idetape_stage_t *last_stage;
377 /* Optional free stage which we can use */
378 idetape_stage_t *cache_stage;
380 /* Wasted space in each stage */
383 /* Status/Action flags: long for set_bit */
385 /* protects the ide-tape queue */
389 * Measures average tape speed
391 unsigned long avg_time;
395 /* the door is currently locked */
397 /* the tape hardware is write protected */
399 /* the tape is write protected (hardware or opened as read-only) */
403 * Limit the number of times a request can
404 * be postponed, to avoid an infinite postpone
407 /* request postpone count limit */
411 * Measures number of frames:
413 * 1. written/read to/from the driver pipeline (pipeline_head).
414 * 2. written/read to/from the tape buffers (idetape_bh).
415 * 3. written/read by the tape to/from the media (tape_head).
423 * Speed control at the tape buffers input/output
425 unsigned long insert_time;
428 int max_insert_speed;
429 int measure_insert_time;
432 * Speed regulation negative feedback loop
435 int pipeline_head_speed;
436 int controlled_pipeline_head_speed;
437 int uncontrolled_pipeline_head_speed;
438 int controlled_last_pipeline_head;
439 unsigned long uncontrolled_pipeline_head_time;
440 unsigned long controlled_pipeline_head_time;
441 int controlled_previous_pipeline_head;
442 int uncontrolled_previous_pipeline_head;
443 unsigned long controlled_previous_head_time;
444 unsigned long uncontrolled_previous_head_time;
445 int restart_speed_control_req;
450 static DEFINE_MUTEX(idetape_ref_mutex);
452 static struct class *idetape_sysfs_class;
454 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
456 #define ide_tape_g(disk) \
457 container_of((disk)->private_data, struct ide_tape_obj, driver)
459 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
461 struct ide_tape_obj *tape = NULL;
463 mutex_lock(&idetape_ref_mutex);
464 tape = ide_tape_g(disk);
466 kref_get(&tape->kref);
467 mutex_unlock(&idetape_ref_mutex);
471 static void ide_tape_release(struct kref *);
473 static void ide_tape_put(struct ide_tape_obj *tape)
475 mutex_lock(&idetape_ref_mutex);
476 kref_put(&tape->kref, ide_tape_release);
477 mutex_unlock(&idetape_ref_mutex);
483 #define DOOR_UNLOCKED 0
484 #define DOOR_LOCKED 1
485 #define DOOR_EXPLICITLY_LOCKED 2
488 * Tape flag bits values.
490 #define IDETAPE_IGNORE_DSC 0
491 #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
492 #define IDETAPE_BUSY 2 /* Device already opened */
493 #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
494 #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
495 #define IDETAPE_FILEMARK 5 /* Currently on a filemark */
496 #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
497 #define IDETAPE_READ_ERROR 7
498 #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
499 /* 0 = no tape is loaded, so we don't rewind after ejecting */
500 #define IDETAPE_MEDIUM_PRESENT 9
503 * Some defines for the READ BUFFER command
505 #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
508 * Some defines for the SPACE command
510 #define IDETAPE_SPACE_OVER_FILEMARK 1
511 #define IDETAPE_SPACE_TO_EOD 3
514 * Some defines for the LOAD UNLOAD command
516 #define IDETAPE_LU_LOAD_MASK 1
517 #define IDETAPE_LU_RETENSION_MASK 2
518 #define IDETAPE_LU_EOT_MASK 4
521 * Special requests for our block device strategy routine.
523 * In order to service a character device command, we add special
524 * requests to the tail of our block device request queue and wait
525 * for their completion.
529 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
530 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
531 REQ_IDETAPE_READ = (1 << 2),
532 REQ_IDETAPE_WRITE = (1 << 3),
533 REQ_IDETAPE_READ_BUFFER = (1 << 4),
537 * Error codes which are returned in rq->errors to the higher part
540 #define IDETAPE_ERROR_GENERAL 101
541 #define IDETAPE_ERROR_FILEMARK 102
542 #define IDETAPE_ERROR_EOD 103
545 * The following is used to format the general configuration word of
546 * the ATAPI IDENTIFY DEVICE command.
548 struct idetape_id_gcw {
549 unsigned packet_size :2; /* Packet Size */
550 unsigned reserved234 :3; /* Reserved */
551 unsigned drq_type :2; /* Command packet DRQ type */
552 unsigned removable :1; /* Removable media */
553 unsigned device_type :5; /* Device type */
554 unsigned reserved13 :1; /* Reserved */
555 unsigned protocol :2; /* Protocol type */
558 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
559 #define IDETAPE_BLOCK_DESCRIPTOR 0
560 #define IDETAPE_CAPABILITIES_PAGE 0x2a
563 * The variables below are used for the character device interface.
564 * Additional state variables are defined in our ide_drive_t structure.
566 static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES];
568 #define ide_tape_f(file) ((file)->private_data)
570 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
572 struct ide_tape_obj *tape = NULL;
574 mutex_lock(&idetape_ref_mutex);
575 tape = idetape_devs[i];
577 kref_get(&tape->kref);
578 mutex_unlock(&idetape_ref_mutex);
583 * Function declarations
586 static int idetape_chrdev_release (struct inode *inode, struct file *filp);
587 static void idetape_write_release (ide_drive_t *drive, unsigned int minor);
590 * Too bad. The drive wants to send us data which we are not ready to accept.
591 * Just throw it away.
593 static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount)
596 (void) HWIF(drive)->INB(IDE_DATA_REG);
599 static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
601 struct idetape_bh *bh = pc->bh;
606 printk(KERN_ERR "ide-tape: bh == NULL in "
607 "idetape_input_buffers\n");
608 idetape_discard_data(drive, bcount);
611 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount);
612 HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count);
614 atomic_add(count, &bh->b_count);
615 if (atomic_read(&bh->b_count) == bh->b_size) {
618 atomic_set(&bh->b_count, 0);
624 static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
626 struct idetape_bh *bh = pc->bh;
631 printk(KERN_ERR "ide-tape: bh == NULL in "
632 "idetape_output_buffers\n");
635 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
636 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
639 pc->b_count -= count;
641 pc->bh = bh = bh->b_reqnext;
643 pc->b_data = bh->b_data;
644 pc->b_count = atomic_read(&bh->b_count);
650 static void idetape_update_buffers (idetape_pc_t *pc)
652 struct idetape_bh *bh = pc->bh;
654 unsigned int bcount = pc->actually_transferred;
656 if (test_bit(PC_WRITING, &pc->flags))
660 printk(KERN_ERR "ide-tape: bh == NULL in "
661 "idetape_update_buffers\n");
664 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
665 atomic_set(&bh->b_count, count);
666 if (atomic_read(&bh->b_count) == bh->b_size)
674 * idetape_next_pc_storage returns a pointer to a place in which we can
675 * safely store a packet command, even though we intend to leave the
676 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
677 * commands is allocated at initialization time.
679 static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive)
681 idetape_tape_t *tape = drive->driver_data;
683 debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index);
685 if (tape->pc_stack_index == IDETAPE_PC_STACK)
686 tape->pc_stack_index=0;
687 return (&tape->pc_stack[tape->pc_stack_index++]);
691 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
692 * Since we queue packet commands in the request queue, we need to
693 * allocate a request, along with the allocation of a packet command.
696 /**************************************************************
698 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
699 * followed later on by kfree(). -ml *
701 **************************************************************/
703 static struct request *idetape_next_rq_storage (ide_drive_t *drive)
705 idetape_tape_t *tape = drive->driver_data;
707 debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index);
709 if (tape->rq_stack_index == IDETAPE_PC_STACK)
710 tape->rq_stack_index=0;
711 return (&tape->rq_stack[tape->rq_stack_index++]);
715 * idetape_init_pc initializes a packet command.
717 static void idetape_init_pc (idetape_pc_t *pc)
719 memset(pc->c, 0, 12);
722 pc->request_transfer = 0;
723 pc->buffer = pc->pc_buffer;
724 pc->buffer_size = IDETAPE_PC_BUFFER_SIZE;
730 * called on each failed packet command retry to analyze the request sense. We
731 * currently do not utilize this information.
733 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
735 idetape_tape_t *tape = drive->driver_data;
736 idetape_pc_t *pc = tape->failed_pc;
738 tape->sense_key = sense[2] & 0xF;
739 tape->asc = sense[12];
740 tape->ascq = sense[13];
742 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
743 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
745 /* Correct pc->actually_transferred by asking the tape. */
746 if (test_bit(PC_DMA_ERROR, &pc->flags)) {
747 pc->actually_transferred = pc->request_transfer -
749 be32_to_cpu(get_unaligned((u32 *)&sense[3]));
750 idetape_update_buffers(pc);
754 * If error was the result of a zero-length read or write command,
755 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
756 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
758 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
760 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
761 if (tape->sense_key == 5) {
762 /* don't report an error, everything's ok */
764 /* don't retry read/write */
765 set_bit(PC_ABORT, &pc->flags);
768 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
769 pc->error = IDETAPE_ERROR_FILEMARK;
770 set_bit(PC_ABORT, &pc->flags);
772 if (pc->c[0] == WRITE_6) {
773 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
774 && tape->asc == 0x0 && tape->ascq == 0x2)) {
775 pc->error = IDETAPE_ERROR_EOD;
776 set_bit(PC_ABORT, &pc->flags);
779 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
780 if (tape->sense_key == 8) {
781 pc->error = IDETAPE_ERROR_EOD;
782 set_bit(PC_ABORT, &pc->flags);
784 if (!test_bit(PC_ABORT, &pc->flags) &&
785 pc->actually_transferred)
786 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
790 static void idetape_activate_next_stage(ide_drive_t *drive)
792 idetape_tape_t *tape = drive->driver_data;
793 idetape_stage_t *stage = tape->next_stage;
794 struct request *rq = &stage->rq;
796 debug_log(DBG_PROCS, "Enter %s\n", __func__);
799 printk(KERN_ERR "ide-tape: bug: Trying to activate a non"
800 " existing stage\n");
804 rq->rq_disk = tape->disk;
806 rq->special = (void *)stage->bh;
807 tape->active_data_rq = rq;
808 tape->active_stage = stage;
809 tape->next_stage = stage->next;
813 * idetape_increase_max_pipeline_stages is a part of the feedback
814 * loop which tries to find the optimum number of stages. In the
815 * feedback loop, we are starting from a minimum maximum number of
816 * stages, and if we sense that the pipeline is empty, we try to
817 * increase it, until we reach the user compile time memory limit.
819 static void idetape_increase_max_pipeline_stages (ide_drive_t *drive)
821 idetape_tape_t *tape = drive->driver_data;
822 int increase = (tape->max_pipeline - tape->min_pipeline) / 10;
824 debug_log(DBG_PROCS, "Enter %s\n", __func__);
826 tape->max_stages += max(increase, 1);
827 tape->max_stages = max(tape->max_stages, tape->min_pipeline);
828 tape->max_stages = min(tape->max_stages, tape->max_pipeline);
832 * idetape_kfree_stage calls kfree to completely free a stage, along with
833 * its related buffers.
835 static void __idetape_kfree_stage (idetape_stage_t *stage)
837 struct idetape_bh *prev_bh, *bh = stage->bh;
841 if (bh->b_data != NULL) {
842 size = (int) bh->b_size;
844 free_page((unsigned long) bh->b_data);
846 bh->b_data += PAGE_SIZE;
856 static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage)
858 __idetape_kfree_stage(stage);
862 * idetape_remove_stage_head removes tape->first_stage from the pipeline.
863 * The caller should avoid race conditions.
865 static void idetape_remove_stage_head (ide_drive_t *drive)
867 idetape_tape_t *tape = drive->driver_data;
868 idetape_stage_t *stage;
870 debug_log(DBG_PROCS, "Enter %s\n", __func__);
872 if (tape->first_stage == NULL) {
873 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
876 if (tape->active_stage == tape->first_stage) {
877 printk(KERN_ERR "ide-tape: bug: Trying to free our active "
881 stage = tape->first_stage;
882 tape->first_stage = stage->next;
883 idetape_kfree_stage(tape, stage);
885 if (tape->first_stage == NULL) {
886 tape->last_stage = NULL;
887 if (tape->next_stage != NULL)
888 printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n");
890 printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n");
895 * This will free all the pipeline stages starting from new_last_stage->next
896 * to the end of the list, and point tape->last_stage to new_last_stage.
898 static void idetape_abort_pipeline(ide_drive_t *drive,
899 idetape_stage_t *new_last_stage)
901 idetape_tape_t *tape = drive->driver_data;
902 idetape_stage_t *stage = new_last_stage->next;
903 idetape_stage_t *nstage;
905 debug_log(DBG_PROCS, "%s: Enter %s\n", tape->name, __func__);
908 nstage = stage->next;
909 idetape_kfree_stage(tape, stage);
911 --tape->nr_pending_stages;
915 new_last_stage->next = NULL;
916 tape->last_stage = new_last_stage;
917 tape->next_stage = NULL;
921 * idetape_end_request is used to finish servicing a request, and to
922 * insert a pending pipeline request into the main device queue.
924 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
926 struct request *rq = HWGROUP(drive)->rq;
927 idetape_tape_t *tape = drive->driver_data;
930 int remove_stage = 0;
931 idetape_stage_t *active_stage;
933 debug_log(DBG_PROCS, "Enter %s\n", __func__);
936 case 0: error = IDETAPE_ERROR_GENERAL; break;
937 case 1: error = 0; break;
938 default: error = uptodate;
942 tape->failed_pc = NULL;
944 if (!blk_special_request(rq)) {
945 ide_end_request(drive, uptodate, nr_sects);
949 spin_lock_irqsave(&tape->lock, flags);
951 /* The request was a pipelined data transfer request */
952 if (tape->active_data_rq == rq) {
953 active_stage = tape->active_stage;
954 tape->active_stage = NULL;
955 tape->active_data_rq = NULL;
956 tape->nr_pending_stages--;
957 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
960 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
961 if (error == IDETAPE_ERROR_EOD)
962 idetape_abort_pipeline(drive, active_stage);
964 } else if (rq->cmd[0] & REQ_IDETAPE_READ) {
965 if (error == IDETAPE_ERROR_EOD) {
966 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
967 idetape_abort_pipeline(drive, active_stage);
970 if (tape->next_stage != NULL) {
971 idetape_activate_next_stage(drive);
974 * Insert the next request into the request queue.
976 (void)ide_do_drive_cmd(drive, tape->active_data_rq,
979 idetape_increase_max_pipeline_stages(drive);
982 ide_end_drive_cmd(drive, 0, 0);
983 // blkdev_dequeue_request(rq);
985 // end_that_request_last(rq);
988 idetape_remove_stage_head(drive);
989 if (tape->active_data_rq == NULL)
990 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
991 spin_unlock_irqrestore(&tape->lock, flags);
995 static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive)
997 idetape_tape_t *tape = drive->driver_data;
999 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1001 if (!tape->pc->error) {
1002 idetape_analyze_error(drive, tape->pc->buffer);
1003 idetape_end_request(drive, 1, 0);
1005 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
1006 idetape_end_request(drive, 0, 0);
1011 static void idetape_create_request_sense_cmd (idetape_pc_t *pc)
1013 idetape_init_pc(pc);
1014 pc->c[0] = REQUEST_SENSE;
1016 pc->request_transfer = 20;
1017 pc->callback = &idetape_request_sense_callback;
1020 static void idetape_init_rq(struct request *rq, u8 cmd)
1022 memset(rq, 0, sizeof(*rq));
1023 rq->cmd_type = REQ_TYPE_SPECIAL;
1028 * idetape_queue_pc_head generates a new packet command request in front
1029 * of the request queue, before the current request, so that it will be
1030 * processed immediately, on the next pass through the driver.
1032 * idetape_queue_pc_head is called from the request handling part of
1033 * the driver (the "bottom" part). Safe storage for the request should
1034 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
1035 * before calling idetape_queue_pc_head.
1037 * Memory for those requests is pre-allocated at initialization time, and
1038 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
1039 * space for the maximum possible number of inter-dependent packet commands.
1041 * The higher level of the driver - The ioctl handler and the character
1042 * device handling functions should queue request to the lower level part
1043 * and wait for their completion using idetape_queue_pc_tail or
1044 * idetape_queue_rw_tail.
1046 static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq)
1048 struct ide_tape_obj *tape = drive->driver_data;
1050 idetape_init_rq(rq, REQ_IDETAPE_PC1);
1051 rq->buffer = (char *) pc;
1052 rq->rq_disk = tape->disk;
1053 (void) ide_do_drive_cmd(drive, rq, ide_preempt);
1057 * idetape_retry_pc is called when an error was detected during the
1058 * last packet command. We queue a request sense packet command in
1059 * the head of the request list.
1061 static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
1063 idetape_tape_t *tape = drive->driver_data;
1067 (void)ide_read_error(drive);
1068 pc = idetape_next_pc_storage(drive);
1069 rq = idetape_next_rq_storage(drive);
1070 idetape_create_request_sense_cmd(pc);
1071 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1072 idetape_queue_pc_head(drive, pc, rq);
1077 * idetape_postpone_request postpones the current request so that
1078 * ide.c will be able to service requests from another device on
1079 * the same hwgroup while we are polling for DSC.
1081 static void idetape_postpone_request (ide_drive_t *drive)
1083 idetape_tape_t *tape = drive->driver_data;
1085 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1087 tape->postponed_rq = HWGROUP(drive)->rq;
1088 ide_stall_queue(drive, tape->dsc_poll_freq);
1091 typedef void idetape_io_buf(ide_drive_t *, idetape_pc_t *, unsigned int);
1094 * This is the usual interrupt handler which will be called during a packet
1095 * command. We will transfer some of the data (as requested by the drive) and
1096 * will re-point interrupt handler to us. When data transfer is finished, we
1097 * will act according to the algorithm described before
1098 * idetape_issue_packet_command.
1100 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
1102 ide_hwif_t *hwif = drive->hwif;
1103 idetape_tape_t *tape = drive->driver_data;
1104 idetape_pc_t *pc = tape->pc;
1105 xfer_func_t *xferfunc;
1106 idetape_io_buf *iobuf;
1109 static int error_sim_count = 0;
1114 debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__);
1116 /* Clear the interrupt */
1117 stat = ide_read_status(drive);
1119 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1120 if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) {
1122 * A DMA error is sometimes expected. For example,
1123 * if the tape is crossing a filemark during a
1124 * READ command, it will issue an irq and position
1125 * itself before the filemark, so that only a partial
1126 * data transfer will occur (which causes the DMA
1127 * error). In that case, we will later ask the tape
1128 * how much bytes of the original request were
1129 * actually transferred (we can't receive that
1130 * information from the DMA engine on most chipsets).
1134 * On the contrary, a DMA error is never expected;
1135 * it usually indicates a hardware error or abort.
1136 * If the tape crosses a filemark during a READ
1137 * command, it will issue an irq and position itself
1138 * after the filemark (not before). Only a partial
1139 * data transfer will occur, but no DMA error.
1142 set_bit(PC_DMA_ERROR, &pc->flags);
1144 pc->actually_transferred = pc->request_transfer;
1145 idetape_update_buffers(pc);
1147 debug_log(DBG_PROCS, "DMA finished\n");
1151 /* No more interrupts */
1152 if ((stat & DRQ_STAT) == 0) {
1153 debug_log(DBG_SENSE, "Packet command completed, %d bytes"
1154 " transferred\n", pc->actually_transferred);
1156 clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
1160 if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) &&
1161 (++error_sim_count % 100) == 0) {
1162 printk(KERN_INFO "ide-tape: %s: simulating error\n",
1167 if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
1169 if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) {
1170 /* Error detected */
1171 debug_log(DBG_ERR, "%s: I/O error\n", tape->name);
1173 if (pc->c[0] == REQUEST_SENSE) {
1174 printk(KERN_ERR "ide-tape: I/O error in request"
1175 " sense command\n");
1176 return ide_do_reset(drive);
1178 debug_log(DBG_ERR, "[cmd %x]: check condition\n",
1181 /* Retry operation */
1182 return idetape_retry_pc(drive);
1185 if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) &&
1186 (stat & SEEK_STAT) == 0) {
1187 /* Media access command */
1188 tape->dsc_polling_start = jiffies;
1189 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
1190 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
1191 /* Allow ide.c to handle other requests */
1192 idetape_postpone_request(drive);
1195 if (tape->failed_pc == pc)
1196 tape->failed_pc = NULL;
1197 /* Command finished - Call the callback function */
1198 return pc->callback(drive);
1200 if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1201 printk(KERN_ERR "ide-tape: The tape wants to issue more "
1202 "interrupts in DMA mode\n");
1203 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
1205 return ide_do_reset(drive);
1207 /* Get the number of bytes to transfer on this interrupt. */
1208 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) |
1209 hwif->INB(IDE_BCOUNTL_REG);
1211 ireason = hwif->INB(IDE_IREASON_REG);
1214 printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__);
1215 return ide_do_reset(drive);
1217 if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) {
1218 /* Hopefully, we will never get here */
1219 printk(KERN_ERR "ide-tape: We wanted to %s, ",
1220 (ireason & IO) ? "Write" : "Read");
1221 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
1222 (ireason & IO) ? "Read" : "Write");
1223 return ide_do_reset(drive);
1225 if (!test_bit(PC_WRITING, &pc->flags)) {
1226 /* Reading - Check that we have enough space */
1227 temp = pc->actually_transferred + bcount;
1228 if (temp > pc->request_transfer) {
1229 if (temp > pc->buffer_size) {
1230 printk(KERN_ERR "ide-tape: The tape wants to "
1231 "send us more data than expected "
1232 "- discarding data\n");
1233 idetape_discard_data(drive, bcount);
1234 ide_set_handler(drive, &idetape_pc_intr,
1235 IDETAPE_WAIT_CMD, NULL);
1238 debug_log(DBG_SENSE, "The tape wants to send us more "
1239 "data than expected - allowing transfer\n");
1241 iobuf = &idetape_input_buffers;
1242 xferfunc = hwif->atapi_input_bytes;
1244 iobuf = &idetape_output_buffers;
1245 xferfunc = hwif->atapi_output_bytes;
1249 iobuf(drive, pc, bcount);
1251 xferfunc(drive, pc->current_position, bcount);
1253 /* Update the current position */
1254 pc->actually_transferred += bcount;
1255 pc->current_position += bcount;
1257 debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n",
1260 /* And set the interrupt handler again */
1261 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1266 * Packet Command Interface
1268 * The current Packet Command is available in tape->pc, and will not
1269 * change until we finish handling it. Each packet command is associated
1270 * with a callback function that will be called when the command is
1273 * The handling will be done in three stages:
1275 * 1. idetape_issue_packet_command will send the packet command to the
1276 * drive, and will set the interrupt handler to idetape_pc_intr.
1278 * 2. On each interrupt, idetape_pc_intr will be called. This step
1279 * will be repeated until the device signals us that no more
1280 * interrupts will be issued.
1282 * 3. ATAPI Tape media access commands have immediate status with a
1283 * delayed process. In case of a successful initiation of a
1284 * media access packet command, the DSC bit will be set when the
1285 * actual execution of the command is finished.
1286 * Since the tape drive will not issue an interrupt, we have to
1287 * poll for this event. In this case, we define the request as
1288 * "low priority request" by setting rq_status to
1289 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
1292 * ide.c will then give higher priority to requests which
1293 * originate from the other device, until will change rq_status
1296 * 4. When the packet command is finished, it will be checked for errors.
1298 * 5. In case an error was found, we queue a request sense packet
1299 * command in front of the request queue and retry the operation
1300 * up to IDETAPE_MAX_PC_RETRIES times.
1302 * 6. In case no error was found, or we decided to give up and not
1303 * to retry again, the callback function will be called and then
1304 * we will handle the next request.
1307 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
1309 ide_hwif_t *hwif = drive->hwif;
1310 idetape_tape_t *tape = drive->driver_data;
1311 idetape_pc_t *pc = tape->pc;
1313 ide_startstop_t startstop;
1316 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
1317 printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
1320 ireason = hwif->INB(IDE_IREASON_REG);
1321 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
1322 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
1323 "a packet command, retrying\n");
1325 ireason = hwif->INB(IDE_IREASON_REG);
1327 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
1328 "issuing a packet command, ignoring\n");
1333 if ((ireason & CD) == 0 || (ireason & IO)) {
1334 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
1335 "a packet command\n");
1336 return ide_do_reset(drive);
1338 /* Set the interrupt routine */
1339 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1340 #ifdef CONFIG_BLK_DEV_IDEDMA
1341 /* Begin DMA, if necessary */
1342 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags))
1343 hwif->dma_start(drive);
1345 /* Send the actual packet */
1346 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
1350 static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc)
1352 ide_hwif_t *hwif = drive->hwif;
1353 idetape_tape_t *tape = drive->driver_data;
1357 if (tape->pc->c[0] == REQUEST_SENSE &&
1358 pc->c[0] == REQUEST_SENSE) {
1359 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
1360 "Two request sense in serial were issued\n");
1363 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
1364 tape->failed_pc = pc;
1365 /* Set the current packet command */
1368 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
1369 test_bit(PC_ABORT, &pc->flags)) {
1371 * We will "abort" retrying a packet command in case
1372 * a legitimate error code was received (crossing a
1373 * filemark, or end of the media, for example).
1375 if (!test_bit(PC_ABORT, &pc->flags)) {
1376 if (!(pc->c[0] == TEST_UNIT_READY &&
1377 tape->sense_key == 2 && tape->asc == 4 &&
1378 (tape->ascq == 1 || tape->ascq == 8))) {
1379 printk(KERN_ERR "ide-tape: %s: I/O error, "
1380 "pc = %2x, key = %2x, "
1381 "asc = %2x, ascq = %2x\n",
1382 tape->name, pc->c[0],
1383 tape->sense_key, tape->asc,
1387 pc->error = IDETAPE_ERROR_GENERAL;
1389 tape->failed_pc = NULL;
1390 return pc->callback(drive);
1392 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
1395 /* We haven't transferred any data yet */
1396 pc->actually_transferred = 0;
1397 pc->current_position = pc->buffer;
1398 /* Request to transfer the entire buffer at once */
1399 bcount = pc->request_transfer;
1401 if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) {
1402 printk(KERN_WARNING "ide-tape: DMA disabled, "
1403 "reverting to PIO\n");
1406 if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
1407 dma_ok = !hwif->dma_setup(drive);
1409 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
1410 IDE_TFLAG_OUT_DEVICE, bcount, dma_ok);
1412 if (dma_ok) /* Will begin DMA later */
1413 set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
1414 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) {
1415 ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc,
1416 IDETAPE_WAIT_CMD, NULL);
1419 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
1420 return idetape_transfer_pc(drive);
1425 * General packet command callback function.
1427 static ide_startstop_t idetape_pc_callback (ide_drive_t *drive)
1429 idetape_tape_t *tape = drive->driver_data;
1431 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1433 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
1438 * A mode sense command is used to "sense" tape parameters.
1440 static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
1442 idetape_init_pc(pc);
1443 pc->c[0] = MODE_SENSE;
1444 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
1445 pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */
1446 pc->c[2] = page_code;
1448 * Changed pc->c[3] to 0 (255 will at best return unused info).
1450 * For SCSI this byte is defined as subpage instead of high byte
1451 * of length and some IDE drives seem to interpret it this way
1452 * and return an error when 255 is used.
1455 pc->c[4] = 255; /* (We will just discard data in that case) */
1456 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
1457 pc->request_transfer = 12;
1458 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
1459 pc->request_transfer = 24;
1461 pc->request_transfer = 50;
1462 pc->callback = &idetape_pc_callback;
1465 static void idetape_calculate_speeds(ide_drive_t *drive)
1467 idetape_tape_t *tape = drive->driver_data;
1469 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
1470 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
1471 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time;
1472 tape->controlled_last_pipeline_head = tape->pipeline_head;
1473 tape->controlled_pipeline_head_time = jiffies;
1475 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
1476 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time);
1477 else if (time_after(jiffies, tape->controlled_previous_head_time))
1478 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time);
1480 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) {
1481 /* -1 for read mode error recovery */
1482 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) {
1483 tape->uncontrolled_pipeline_head_time = jiffies;
1484 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time);
1487 tape->uncontrolled_previous_head_time = jiffies;
1488 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
1489 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) {
1490 tape->uncontrolled_pipeline_head_time = jiffies;
1493 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
1495 if (tape->speed_control == 1) {
1496 if (tape->nr_pending_stages >= tape->max_stages / 2)
1497 tape->max_insert_speed = tape->pipeline_head_speed +
1498 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
1500 tape->max_insert_speed = 500 +
1501 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
1503 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
1504 tape->max_insert_speed = 5000;
1506 tape->max_insert_speed = tape->speed_control;
1508 tape->max_insert_speed = max(tape->max_insert_speed, 500);
1511 static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
1513 idetape_tape_t *tape = drive->driver_data;
1514 idetape_pc_t *pc = tape->pc;
1517 stat = ide_read_status(drive);
1519 if (stat & SEEK_STAT) {
1520 if (stat & ERR_STAT) {
1521 /* Error detected */
1522 if (pc->c[0] != TEST_UNIT_READY)
1523 printk(KERN_ERR "ide-tape: %s: I/O error, ",
1525 /* Retry operation */
1526 return idetape_retry_pc(drive);
1529 if (tape->failed_pc == pc)
1530 tape->failed_pc = NULL;
1532 pc->error = IDETAPE_ERROR_GENERAL;
1533 tape->failed_pc = NULL;
1535 return pc->callback(drive);
1538 static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
1540 idetape_tape_t *tape = drive->driver_data;
1541 struct request *rq = HWGROUP(drive)->rq;
1542 int blocks = tape->pc->actually_transferred / tape->blk_size;
1544 tape->avg_size += blocks * tape->blk_size;
1545 tape->insert_size += blocks * tape->blk_size;
1546 if (tape->insert_size > 1024 * 1024)
1547 tape->measure_insert_time = 1;
1548 if (tape->measure_insert_time) {
1549 tape->measure_insert_time = 0;
1550 tape->insert_time = jiffies;
1551 tape->insert_size = 0;
1553 if (time_after(jiffies, tape->insert_time))
1554 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
1555 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
1556 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024;
1558 tape->avg_time = jiffies;
1560 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1562 tape->first_frame += blocks;
1563 rq->current_nr_sectors -= blocks;
1565 if (!tape->pc->error)
1566 idetape_end_request(drive, 1, 0);
1568 idetape_end_request(drive, tape->pc->error, 0);
1572 static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
1574 idetape_init_pc(pc);
1576 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
1578 pc->callback = &idetape_rw_callback;
1580 atomic_set(&bh->b_count, 0);
1582 pc->buffer_size = length * tape->blk_size;
1583 pc->request_transfer = pc->buffer_size;
1584 if (pc->request_transfer == tape->stage_size)
1585 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
1588 static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
1591 struct idetape_bh *p = bh;
1593 idetape_init_pc(pc);
1594 pc->c[0] = READ_BUFFER;
1595 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK;
1596 pc->c[7] = size >> 8;
1597 pc->c[8] = size & 0xff;
1598 pc->callback = &idetape_pc_callback;
1600 atomic_set(&bh->b_count, 0);
1603 atomic_set(&p->b_count, 0);
1606 pc->request_transfer = pc->buffer_size = size;
1609 static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
1611 idetape_init_pc(pc);
1613 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
1615 pc->callback = &idetape_rw_callback;
1616 set_bit(PC_WRITING, &pc->flags);
1618 pc->b_data = bh->b_data;
1619 pc->b_count = atomic_read(&bh->b_count);
1621 pc->buffer_size = length * tape->blk_size;
1622 pc->request_transfer = pc->buffer_size;
1623 if (pc->request_transfer == tape->stage_size)
1624 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
1628 * idetape_do_request is our request handling function.
1630 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
1631 struct request *rq, sector_t block)
1633 idetape_tape_t *tape = drive->driver_data;
1634 idetape_pc_t *pc = NULL;
1635 struct request *postponed_rq = tape->postponed_rq;
1638 debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld,"
1639 " current_nr_sectors: %d\n",
1640 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
1642 if (!blk_special_request(rq)) {
1644 * We do not support buffer cache originated requests.
1646 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
1647 "request queue (%d)\n", drive->name, rq->cmd_type);
1648 ide_end_request(drive, 0, 0);
1653 * Retry a failed packet command
1655 if (tape->failed_pc != NULL &&
1656 tape->pc->c[0] == REQUEST_SENSE) {
1657 return idetape_issue_packet_command(drive, tape->failed_pc);
1659 if (postponed_rq != NULL)
1660 if (rq != postponed_rq) {
1661 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
1662 "Two DSC requests were queued\n");
1663 idetape_end_request(drive, 0, 0);
1667 tape->postponed_rq = NULL;
1670 * If the tape is still busy, postpone our request and service
1671 * the other device meanwhile.
1673 stat = ide_read_status(drive);
1675 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
1676 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1678 if (drive->post_reset == 1) {
1679 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1680 drive->post_reset = 0;
1683 if (time_after(jiffies, tape->insert_time))
1684 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
1685 idetape_calculate_speeds(drive);
1686 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
1687 (stat & SEEK_STAT) == 0) {
1688 if (postponed_rq == NULL) {
1689 tape->dsc_polling_start = jiffies;
1690 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
1691 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
1692 } else if (time_after(jiffies, tape->dsc_timeout)) {
1693 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
1695 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1696 idetape_media_access_finished(drive);
1699 return ide_do_reset(drive);
1701 } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD))
1702 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
1703 idetape_postpone_request(drive);
1706 if (rq->cmd[0] & REQ_IDETAPE_READ) {
1707 tape->buffer_head++;
1708 tape->postpone_cnt = 0;
1709 pc = idetape_next_pc_storage(drive);
1710 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
1713 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
1714 tape->buffer_head++;
1715 tape->postpone_cnt = 0;
1716 pc = idetape_next_pc_storage(drive);
1717 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
1720 if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) {
1721 tape->postpone_cnt = 0;
1722 pc = idetape_next_pc_storage(drive);
1723 idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
1726 if (rq->cmd[0] & REQ_IDETAPE_PC1) {
1727 pc = (idetape_pc_t *) rq->buffer;
1728 rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
1729 rq->cmd[0] |= REQ_IDETAPE_PC2;
1732 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1733 idetape_media_access_finished(drive);
1738 return idetape_issue_packet_command(drive, pc);
1742 * Pipeline related functions
1744 static inline int idetape_pipeline_active (idetape_tape_t *tape)
1748 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
1749 rc2 = (tape->active_data_rq != NULL);
1754 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
1755 * stage, along with all the necessary small buffers which together make
1756 * a buffer of size tape->stage_size (or a bit more). We attempt to
1757 * combine sequential pages as much as possible.
1759 * Returns a pointer to the new allocated stage, or NULL if we
1760 * can't (or don't want to) allocate a stage.
1762 * Pipeline stages are optional and are used to increase performance.
1763 * If we can't allocate them, we'll manage without them.
1765 static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear)
1767 idetape_stage_t *stage;
1768 struct idetape_bh *prev_bh, *bh;
1769 int pages = tape->pages_per_stage;
1770 char *b_data = NULL;
1772 if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
1776 bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1779 bh->b_reqnext = NULL;
1780 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
1783 memset(bh->b_data, 0, PAGE_SIZE);
1784 bh->b_size = PAGE_SIZE;
1785 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1788 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
1791 memset(b_data, 0, PAGE_SIZE);
1792 if (bh->b_data == b_data + PAGE_SIZE) {
1793 bh->b_size += PAGE_SIZE;
1794 bh->b_data -= PAGE_SIZE;
1796 atomic_add(PAGE_SIZE, &bh->b_count);
1799 if (b_data == bh->b_data + bh->b_size) {
1800 bh->b_size += PAGE_SIZE;
1802 atomic_add(PAGE_SIZE, &bh->b_count);
1806 if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) {
1807 free_page((unsigned long) b_data);
1810 bh->b_reqnext = NULL;
1811 bh->b_data = b_data;
1812 bh->b_size = PAGE_SIZE;
1813 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1814 prev_bh->b_reqnext = bh;
1816 bh->b_size -= tape->excess_bh_size;
1818 atomic_sub(tape->excess_bh_size, &bh->b_count);
1821 __idetape_kfree_stage(stage);
1825 static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
1827 idetape_stage_t *cache_stage = tape->cache_stage;
1829 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1831 if (tape->nr_stages >= tape->max_stages)
1833 if (cache_stage != NULL) {
1834 tape->cache_stage = NULL;
1837 return __idetape_kmalloc_stage(tape, 0, 0);
1840 static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n)
1842 struct idetape_bh *bh = tape->bh;
1848 printk(KERN_ERR "ide-tape: bh == NULL in "
1849 "idetape_copy_stage_from_user\n");
1852 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
1853 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count))
1856 atomic_add(count, &bh->b_count);
1858 if (atomic_read(&bh->b_count) == bh->b_size) {
1861 atomic_set(&bh->b_count, 0);
1868 static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n)
1870 struct idetape_bh *bh = tape->bh;
1876 printk(KERN_ERR "ide-tape: bh == NULL in "
1877 "idetape_copy_stage_to_user\n");
1880 count = min(tape->b_count, n);
1881 if (copy_to_user(buf, tape->b_data, count))
1884 tape->b_data += count;
1885 tape->b_count -= count;
1887 if (!tape->b_count) {
1888 tape->bh = bh = bh->b_reqnext;
1890 tape->b_data = bh->b_data;
1891 tape->b_count = atomic_read(&bh->b_count);
1898 static void idetape_init_merge_stage (idetape_tape_t *tape)
1900 struct idetape_bh *bh = tape->merge_stage->bh;
1903 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1904 atomic_set(&bh->b_count, 0);
1906 tape->b_data = bh->b_data;
1907 tape->b_count = atomic_read(&bh->b_count);
1911 static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
1913 struct idetape_bh *tmp;
1916 stage->bh = tape->merge_stage->bh;
1917 tape->merge_stage->bh = tmp;
1918 idetape_init_merge_stage(tape);
1922 * idetape_add_stage_tail adds a new stage at the end of the pipeline.
1924 static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
1926 idetape_tape_t *tape = drive->driver_data;
1927 unsigned long flags;
1929 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1931 spin_lock_irqsave(&tape->lock, flags);
1933 if (tape->last_stage != NULL)
1934 tape->last_stage->next=stage;
1936 tape->first_stage = tape->next_stage=stage;
1937 tape->last_stage = stage;
1938 if (tape->next_stage == NULL)
1939 tape->next_stage = tape->last_stage;
1941 tape->nr_pending_stages++;
1942 spin_unlock_irqrestore(&tape->lock, flags);
1946 * idetape_wait_for_request installs a completion in a pending request
1947 * and sleeps until it is serviced.
1949 * The caller should ensure that the request will not be serviced
1950 * before we install the completion (usually by disabling interrupts).
1952 static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
1954 DECLARE_COMPLETION_ONSTACK(wait);
1955 idetape_tape_t *tape = drive->driver_data;
1957 if (rq == NULL || !blk_special_request(rq)) {
1958 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
1961 rq->end_io_data = &wait;
1962 rq->end_io = blk_end_sync_rq;
1963 spin_unlock_irq(&tape->lock);
1964 wait_for_completion(&wait);
1965 /* The stage and its struct request have been deallocated */
1966 spin_lock_irq(&tape->lock);
1969 static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive)
1971 idetape_tape_t *tape = drive->driver_data;
1972 u8 *readpos = tape->pc->buffer;
1974 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1976 if (!tape->pc->error) {
1977 debug_log(DBG_SENSE, "BOP - %s\n",
1978 (readpos[0] & 0x80) ? "Yes" : "No");
1979 debug_log(DBG_SENSE, "EOP - %s\n",
1980 (readpos[0] & 0x40) ? "Yes" : "No");
1982 if (readpos[0] & 0x4) {
1983 printk(KERN_INFO "ide-tape: Block location is unknown"
1985 clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
1986 idetape_end_request(drive, 0, 0);
1988 debug_log(DBG_SENSE, "Block Location - %u\n",
1989 be32_to_cpu(*(u32 *)&readpos[4]));
1991 tape->partition = readpos[1];
1993 be32_to_cpu(*(u32 *)&readpos[4]);
1994 set_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
1995 idetape_end_request(drive, 1, 0);
1998 idetape_end_request(drive, 0, 0);
2004 * idetape_create_write_filemark_cmd will:
2006 * 1. Write a filemark if write_filemark=1.
2007 * 2. Flush the device buffers without writing a filemark
2008 * if write_filemark=0.
2011 static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark)
2013 idetape_init_pc(pc);
2014 pc->c[0] = WRITE_FILEMARKS;
2015 pc->c[4] = write_filemark;
2016 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2017 pc->callback = &idetape_pc_callback;
2020 static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc)
2022 idetape_init_pc(pc);
2023 pc->c[0] = TEST_UNIT_READY;
2024 pc->callback = &idetape_pc_callback;
2028 * idetape_queue_pc_tail is based on the following functions:
2030 * ide_do_drive_cmd from ide.c
2031 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
2033 * We add a special packet command request to the tail of the request
2034 * queue, and wait for it to be serviced.
2036 * This is not to be called from within the request handling part
2037 * of the driver ! We allocate here data in the stack, and it is valid
2038 * until the request is finished. This is not the case for the bottom
2039 * part of the driver, where we are always leaving the functions to wait
2040 * for an interrupt or a timer event.
2042 * From the bottom part of the driver, we should allocate safe memory
2043 * using idetape_next_pc_storage and idetape_next_rq_storage, and add
2044 * the request to the request list without waiting for it to be serviced !
2045 * In that case, we usually use idetape_queue_pc_head.
2047 static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc)
2049 struct ide_tape_obj *tape = drive->driver_data;
2052 idetape_init_rq(&rq, REQ_IDETAPE_PC1);
2053 rq.buffer = (char *) pc;
2054 rq.rq_disk = tape->disk;
2055 return ide_do_drive_cmd(drive, &rq, ide_wait);
2058 static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd)
2060 idetape_init_pc(pc);
2061 pc->c[0] = START_STOP;
2063 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2064 pc->callback = &idetape_pc_callback;
2067 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
2069 idetape_tape_t *tape = drive->driver_data;
2071 int load_attempted = 0;
2074 * Wait for the tape to become ready
2076 set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
2078 while (time_before(jiffies, timeout)) {
2079 idetape_create_test_unit_ready_cmd(&pc);
2080 if (!__idetape_queue_pc_tail(drive, &pc))
2082 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
2083 || (tape->asc == 0x3A)) { /* no media */
2086 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
2087 __idetape_queue_pc_tail(drive, &pc);
2089 /* not about to be ready */
2090 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
2091 (tape->ascq == 1 || tape->ascq == 8)))
2098 static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
2100 return __idetape_queue_pc_tail(drive, pc);
2103 static int idetape_flush_tape_buffers (ide_drive_t *drive)
2108 idetape_create_write_filemark_cmd(drive, &pc, 0);
2109 if ((rc = idetape_queue_pc_tail(drive, &pc)))
2111 idetape_wait_ready(drive, 60 * 5 * HZ);
2115 static void idetape_create_read_position_cmd (idetape_pc_t *pc)
2117 idetape_init_pc(pc);
2118 pc->c[0] = READ_POSITION;
2119 pc->request_transfer = 20;
2120 pc->callback = &idetape_read_position_callback;
2123 static int idetape_read_position (ide_drive_t *drive)
2125 idetape_tape_t *tape = drive->driver_data;
2129 debug_log(DBG_PROCS, "Enter %s\n", __func__);
2131 idetape_create_read_position_cmd(&pc);
2132 if (idetape_queue_pc_tail(drive, &pc))
2134 position = tape->first_frame;
2138 static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip)
2140 idetape_init_pc(pc);
2141 pc->c[0] = POSITION_TO_ELEMENT;
2143 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
2144 pc->c[8] = partition;
2145 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2146 pc->callback = &idetape_pc_callback;
2149 static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent)
2151 idetape_tape_t *tape = drive->driver_data;
2153 /* device supports locking according to capabilities page */
2154 if (!(tape->caps[6] & 0x01))
2157 idetape_init_pc(pc);
2158 pc->c[0] = ALLOW_MEDIUM_REMOVAL;
2160 pc->callback = &idetape_pc_callback;
2164 static int __idetape_discard_read_pipeline (ide_drive_t *drive)
2166 idetape_tape_t *tape = drive->driver_data;
2167 unsigned long flags;
2170 if (tape->chrdev_dir != IDETAPE_DIR_READ)
2173 /* Remove merge stage. */
2174 cnt = tape->merge_stage_size / tape->blk_size;
2175 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
2176 ++cnt; /* Filemarks count as 1 sector */
2177 tape->merge_stage_size = 0;
2178 if (tape->merge_stage != NULL) {
2179 __idetape_kfree_stage(tape->merge_stage);
2180 tape->merge_stage = NULL;
2183 /* Clear pipeline flags. */
2184 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
2185 tape->chrdev_dir = IDETAPE_DIR_NONE;
2187 /* Remove pipeline stages. */
2188 if (tape->first_stage == NULL)
2191 spin_lock_irqsave(&tape->lock, flags);
2192 tape->next_stage = NULL;
2193 if (idetape_pipeline_active(tape))
2194 idetape_wait_for_request(drive, tape->active_data_rq);
2195 spin_unlock_irqrestore(&tape->lock, flags);
2197 while (tape->first_stage != NULL) {
2198 struct request *rq_ptr = &tape->first_stage->rq;
2200 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
2201 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
2203 idetape_remove_stage_head(drive);
2205 tape->nr_pending_stages = 0;
2206 tape->max_stages = tape->min_pipeline;
2211 * idetape_position_tape positions the tape to the requested block
2212 * using the LOCATE packet command. A READ POSITION command is then
2213 * issued to check where we are positioned.
2215 * Like all higher level operations, we queue the commands at the tail
2216 * of the request queue and wait for their completion.
2219 static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip)
2221 idetape_tape_t *tape = drive->driver_data;
2225 if (tape->chrdev_dir == IDETAPE_DIR_READ)
2226 __idetape_discard_read_pipeline(drive);
2227 idetape_wait_ready(drive, 60 * 5 * HZ);
2228 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
2229 retval = idetape_queue_pc_tail(drive, &pc);
2233 idetape_create_read_position_cmd(&pc);
2234 return (idetape_queue_pc_tail(drive, &pc));
2237 static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position)
2239 idetape_tape_t *tape = drive->driver_data;
2243 cnt = __idetape_discard_read_pipeline(drive);
2244 if (restore_position) {
2245 position = idetape_read_position(drive);
2246 seek = position > cnt ? position - cnt : 0;
2247 if (idetape_position_tape(drive, seek, 0, 0)) {
2248 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name);
2255 * idetape_queue_rw_tail generates a read/write request for the block
2256 * device interface and wait for it to be serviced.
2258 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh)
2260 idetape_tape_t *tape = drive->driver_data;
2263 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
2265 if (idetape_pipeline_active(tape)) {
2266 printk(KERN_ERR "ide-tape: bug: the pipeline is active in %s\n",
2271 idetape_init_rq(&rq, cmd);
2272 rq.rq_disk = tape->disk;
2273 rq.special = (void *)bh;
2274 rq.sector = tape->first_frame;
2275 rq.nr_sectors = rq.current_nr_sectors = blocks;
2276 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
2278 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
2281 if (tape->merge_stage)
2282 idetape_init_merge_stage(tape);
2283 if (rq.errors == IDETAPE_ERROR_GENERAL)
2285 return (tape->blk_size * (blocks-rq.current_nr_sectors));
2289 * idetape_insert_pipeline_into_queue is used to start servicing the
2290 * pipeline stages, starting from tape->next_stage.
2292 static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
2294 idetape_tape_t *tape = drive->driver_data;
2296 if (tape->next_stage == NULL)
2298 if (!idetape_pipeline_active(tape)) {
2299 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
2300 idetape_activate_next_stage(drive);
2301 (void) ide_do_drive_cmd(drive, tape->active_data_rq, ide_end);
2305 static void idetape_create_inquiry_cmd (idetape_pc_t *pc)
2307 idetape_init_pc(pc);
2309 pc->c[4] = pc->request_transfer = 254;
2310 pc->callback = &idetape_pc_callback;
2313 static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
2315 idetape_init_pc(pc);
2316 pc->c[0] = REZERO_UNIT;
2317 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2318 pc->callback = &idetape_pc_callback;
2321 static void idetape_create_erase_cmd (idetape_pc_t *pc)
2323 idetape_init_pc(pc);
2326 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2327 pc->callback = &idetape_pc_callback;
2330 static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd)
2332 idetape_init_pc(pc);
2334 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
2336 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2337 pc->callback = &idetape_pc_callback;
2340 static void idetape_wait_first_stage (ide_drive_t *drive)
2342 idetape_tape_t *tape = drive->driver_data;
2343 unsigned long flags;
2345 if (tape->first_stage == NULL)
2347 spin_lock_irqsave(&tape->lock, flags);
2348 if (tape->active_stage == tape->first_stage)
2349 idetape_wait_for_request(drive, tape->active_data_rq);
2350 spin_unlock_irqrestore(&tape->lock, flags);
2354 * idetape_add_chrdev_write_request tries to add a character device
2355 * originated write request to our pipeline. In case we don't succeed,
2356 * we revert to non-pipelined operation mode for this request.
2358 * 1. Try to allocate a new pipeline stage.
2359 * 2. If we can't, wait for more and more requests to be serviced
2360 * and try again each time.
2361 * 3. If we still can't allocate a stage, fallback to
2362 * non-pipelined operation mode for this request.
2364 static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
2366 idetape_tape_t *tape = drive->driver_data;
2367 idetape_stage_t *new_stage;
2368 unsigned long flags;
2371 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2374 * Attempt to allocate a new stage.
2375 * Pay special attention to possible race conditions.
2377 while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
2378 spin_lock_irqsave(&tape->lock, flags);
2379 if (idetape_pipeline_active(tape)) {
2380 idetape_wait_for_request(drive, tape->active_data_rq);
2381 spin_unlock_irqrestore(&tape->lock, flags);
2383 spin_unlock_irqrestore(&tape->lock, flags);
2384 idetape_insert_pipeline_into_queue(drive);
2385 if (idetape_pipeline_active(tape))
2388 * Linux is short on memory. Fallback to
2389 * non-pipelined operation mode for this request.
2391 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
2394 rq = &new_stage->rq;
2395 idetape_init_rq(rq, REQ_IDETAPE_WRITE);
2396 /* Doesn't actually matter - We always assume sequential access */
2397 rq->sector = tape->first_frame;
2398 rq->nr_sectors = rq->current_nr_sectors = blocks;
2400 idetape_switch_buffers(tape, new_stage);
2401 idetape_add_stage_tail(drive, new_stage);
2402 tape->pipeline_head++;
2403 idetape_calculate_speeds(drive);
2406 * Estimate whether the tape has stopped writing by checking
2407 * if our write pipeline is currently empty. If we are not
2408 * writing anymore, wait for the pipeline to be full enough
2409 * (90%) before starting to service requests, so that we will
2410 * be able to keep up with the higher speeds of the tape.
2412 if (!idetape_pipeline_active(tape)) {
2413 if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
2414 tape->nr_stages >= tape->max_stages -
2415 tape->uncontrolled_pipeline_head_speed * 3 * 1024 /
2417 tape->measure_insert_time = 1;
2418 tape->insert_time = jiffies;
2419 tape->insert_size = 0;
2420 tape->insert_speed = 0;
2421 idetape_insert_pipeline_into_queue(drive);
2424 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
2425 /* Return a deferred error */
2431 * idetape_wait_for_pipeline will wait until all pending pipeline
2432 * requests are serviced. Typically called on device close.
2434 static void idetape_wait_for_pipeline (ide_drive_t *drive)
2436 idetape_tape_t *tape = drive->driver_data;
2437 unsigned long flags;
2439 while (tape->next_stage || idetape_pipeline_active(tape)) {
2440 idetape_insert_pipeline_into_queue(drive);
2441 spin_lock_irqsave(&tape->lock, flags);
2442 if (idetape_pipeline_active(tape))
2443 idetape_wait_for_request(drive, tape->active_data_rq);
2444 spin_unlock_irqrestore(&tape->lock, flags);
2448 static void idetape_empty_write_pipeline (ide_drive_t *drive)
2450 idetape_tape_t *tape = drive->driver_data;
2452 struct idetape_bh *bh;
2454 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
2455 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
2458 if (tape->merge_stage_size > tape->stage_size) {
2459 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
2460 tape->merge_stage_size = tape->stage_size;
2462 if (tape->merge_stage_size) {
2463 blocks = tape->merge_stage_size / tape->blk_size;
2464 if (tape->merge_stage_size % tape->blk_size) {
2468 i = tape->blk_size - tape->merge_stage_size %
2470 bh = tape->bh->b_reqnext;
2472 atomic_set(&bh->b_count, 0);
2479 printk(KERN_INFO "ide-tape: bug, bh NULL\n");
2482 min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count)));
2483 memset(bh->b_data + atomic_read(&bh->b_count), 0, min);
2484 atomic_add(min, &bh->b_count);
2489 (void) idetape_add_chrdev_write_request(drive, blocks);
2490 tape->merge_stage_size = 0;
2492 idetape_wait_for_pipeline(drive);
2493 if (tape->merge_stage != NULL) {
2494 __idetape_kfree_stage(tape->merge_stage);
2495 tape->merge_stage = NULL;
2497 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
2498 tape->chrdev_dir = IDETAPE_DIR_NONE;
2501 * On the next backup, perform the feedback loop again.
2502 * (I don't want to keep sense information between backups,
2503 * as some systems are constantly on, and the system load
2504 * can be totally different on the next backup).
2506 tape->max_stages = tape->min_pipeline;
2507 if (tape->first_stage != NULL ||
2508 tape->next_stage != NULL ||
2509 tape->last_stage != NULL ||
2510 tape->nr_stages != 0) {
2511 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
2512 "first_stage %p, next_stage %p, "
2513 "last_stage %p, nr_stages %d\n",
2514 tape->first_stage, tape->next_stage,
2515 tape->last_stage, tape->nr_stages);
2519 static void idetape_restart_speed_control (ide_drive_t *drive)
2521 idetape_tape_t *tape = drive->driver_data;
2523 tape->restart_speed_control_req = 0;
2524 tape->pipeline_head = 0;
2525 tape->controlled_last_pipeline_head = 0;
2526 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0;
2527 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000;
2528 tape->uncontrolled_pipeline_head_speed = 0;
2529 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies;
2530 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies;
2533 static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
2535 idetape_tape_t *tape = drive->driver_data;
2536 idetape_stage_t *new_stage;
2539 u16 blocks = *(u16 *)&tape->caps[12];
2541 /* Initialize read operation */
2542 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
2543 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
2544 idetape_empty_write_pipeline(drive);
2545 idetape_flush_tape_buffers(drive);
2547 if (tape->merge_stage || tape->merge_stage_size) {
2548 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
2549 tape->merge_stage_size = 0;
2551 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
2553 tape->chrdev_dir = IDETAPE_DIR_READ;
2556 * Issue a read 0 command to ensure that DSC handshake
2557 * is switched from completion mode to buffer available
2559 * No point in issuing this if DSC overlap isn't supported,
2560 * some drives (Seagate STT3401A) will return an error.
2562 if (drive->dsc_overlap) {
2563 bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
2564 if (bytes_read < 0) {
2565 __idetape_kfree_stage(tape->merge_stage);
2566 tape->merge_stage = NULL;
2567 tape->chrdev_dir = IDETAPE_DIR_NONE;
2572 if (tape->restart_speed_control_req)
2573 idetape_restart_speed_control(drive);
2574 idetape_init_rq(&rq, REQ_IDETAPE_READ);
2575 rq.sector = tape->first_frame;
2576 rq.nr_sectors = rq.current_nr_sectors = blocks;
2577 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) &&
2578 tape->nr_stages < max_stages) {
2579 new_stage = idetape_kmalloc_stage(tape);
2580 while (new_stage != NULL) {
2582 idetape_add_stage_tail(drive, new_stage);
2583 if (tape->nr_stages >= max_stages)
2585 new_stage = idetape_kmalloc_stage(tape);
2588 if (!idetape_pipeline_active(tape)) {
2589 if (tape->nr_pending_stages >= 3 * max_stages / 4) {
2590 tape->measure_insert_time = 1;
2591 tape->insert_time = jiffies;
2592 tape->insert_size = 0;
2593 tape->insert_speed = 0;
2594 idetape_insert_pipeline_into_queue(drive);
2601 * idetape_add_chrdev_read_request is called from idetape_chrdev_read
2602 * to service a character device read request and add read-ahead
2603 * requests to our pipeline.
2605 static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
2607 idetape_tape_t *tape = drive->driver_data;
2608 unsigned long flags;
2609 struct request *rq_ptr;
2612 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
2615 * If we are at a filemark, return a read length of 0
2617 if (test_bit(IDETAPE_FILEMARK, &tape->flags))
2621 * Wait for the next block to be available at the head
2624 idetape_initiate_read(drive, tape->max_stages);
2625 if (tape->first_stage == NULL) {
2626 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
2628 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
2629 tape->merge_stage->bh);
2631 idetape_wait_first_stage(drive);
2632 rq_ptr = &tape->first_stage->rq;
2633 bytes_read = tape->blk_size * (rq_ptr->nr_sectors -
2634 rq_ptr->current_nr_sectors);
2635 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
2638 if (rq_ptr->errors == IDETAPE_ERROR_EOD)
2641 idetape_switch_buffers(tape, tape->first_stage);
2642 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
2643 set_bit(IDETAPE_FILEMARK, &tape->flags);
2644 spin_lock_irqsave(&tape->lock, flags);
2645 idetape_remove_stage_head(drive);
2646 spin_unlock_irqrestore(&tape->lock, flags);
2647 tape->pipeline_head++;
2648 idetape_calculate_speeds(drive);
2650 if (bytes_read > blocks * tape->blk_size) {
2651 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
2652 bytes_read = blocks * tape->blk_size;
2654 return (bytes_read);
2657 static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
2659 idetape_tape_t *tape = drive->driver_data;
2660 struct idetape_bh *bh;
2666 bh = tape->merge_stage->bh;
2667 count = min(tape->stage_size, bcount);
2669 blocks = count / tape->blk_size;
2671 atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size));
2672 memset(bh->b_data, 0, atomic_read(&bh->b_count));
2673 count -= atomic_read(&bh->b_count);
2676 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
2680 static int idetape_pipeline_size (ide_drive_t *drive)
2682 idetape_tape_t *tape = drive->driver_data;
2683 idetape_stage_t *stage;
2687 idetape_wait_for_pipeline(drive);
2688 stage = tape->first_stage;
2689 while (stage != NULL) {
2691 size += tape->blk_size * (rq->nr_sectors -
2692 rq->current_nr_sectors);
2693 if (rq->errors == IDETAPE_ERROR_FILEMARK)
2694 size += tape->blk_size;
2695 stage = stage->next;
2697 size += tape->merge_stage_size;
2702 * Rewinds the tape to the Beginning Of the current Partition (BOP).
2704 * We currently support only one partition.
2706 static int idetape_rewind_tape (ide_drive_t *drive)
2710 idetape_tape_t *tape;
2711 tape = drive->driver_data;
2713 debug_log(DBG_SENSE, "Enter %s\n", __func__);
2715 idetape_create_rewind_cmd(drive, &pc);
2716 retval = idetape_queue_pc_tail(drive, &pc);
2720 idetape_create_read_position_cmd(&pc);
2721 retval = idetape_queue_pc_tail(drive, &pc);
2728 * Our special ide-tape ioctl's.
2730 * Currently there aren't any ioctl's.
2731 * mtio.h compatible commands should be issued to the character device
2734 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg)
2736 idetape_tape_t *tape = drive->driver_data;
2737 void __user *argp = (void __user *)arg;
2739 struct idetape_config {
2740 int dsc_rw_frequency;
2741 int dsc_media_access_frequency;
2745 debug_log(DBG_PROCS, "Enter %s\n", __func__);
2749 if (copy_from_user(&config, argp, sizeof(config)))
2751 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
2752 tape->max_stages = config.nr_stages;
2755 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
2756 config.nr_stages = tape->max_stages;
2757 if (copy_to_user(argp, &config, sizeof(config)))
2767 * idetape_space_over_filemarks is now a bit more complicated than just
2768 * passing the command to the tape since we may have crossed some
2769 * filemarks during our pipelined read-ahead mode.
2771 * As a minor side effect, the pipeline enables us to support MTFSFM when
2772 * the filemark is in our internal pipeline even if the tape doesn't
2773 * support spacing over filemarks in the reverse direction.
2775 static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
2777 idetape_tape_t *tape = drive->driver_data;
2779 unsigned long flags;
2781 int sprev = !!(tape->caps[4] & 0x20);
2785 if (MTBSF == mt_op || MTBSFM == mt_op) {
2788 mt_count = - mt_count;
2791 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2793 * We have a read-ahead buffer. Scan it for crossed
2796 tape->merge_stage_size = 0;
2797 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
2799 while (tape->first_stage != NULL) {
2800 if (count == mt_count) {
2801 if (mt_op == MTFSFM)
2802 set_bit(IDETAPE_FILEMARK, &tape->flags);
2805 spin_lock_irqsave(&tape->lock, flags);
2806 if (tape->first_stage == tape->active_stage) {
2808 * We have reached the active stage in the read pipeline.
2809 * There is no point in allowing the drive to continue
2810 * reading any farther, so we stop the pipeline.
2812 * This section should be moved to a separate subroutine,
2813 * because a similar function is performed in
2814 * __idetape_discard_read_pipeline(), for example.
2816 tape->next_stage = NULL;
2817 spin_unlock_irqrestore(&tape->lock, flags);
2818 idetape_wait_first_stage(drive);
2819 tape->next_stage = tape->first_stage->next;
2821 spin_unlock_irqrestore(&tape->lock, flags);
2822 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
2824 idetape_remove_stage_head(drive);
2826 idetape_discard_read_pipeline(drive, 0);
2830 * The filemark was not found in our internal pipeline.
2831 * Now we can issue the space command.
2836 idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
2837 return (idetape_queue_pc_tail(drive, &pc));
2842 retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count);
2843 if (retval) return (retval);
2844 count = (MTBSFM == mt_op ? 1 : -1);
2845 return (idetape_space_over_filemarks(drive, MTFSF, count));
2847 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
2854 * Our character device read / write functions.
2856 * The tape is optimized to maximize throughput when it is transferring
2857 * an integral number of the "continuous transfer limit", which is
2858 * a parameter of the specific tape (26 KB on my particular tape).
2859 * (32 kB for Onstream)
2861 * As of version 1.3 of the driver, the character device provides an
2862 * abstract continuous view of the media - any mix of block sizes (even 1
2863 * byte) on the same backup/restore procedure is supported. The driver
2864 * will internally convert the requests to the recommended transfer unit,
2865 * so that an unmatch between the user's block size to the recommended
2866 * size will only result in a (slightly) increased driver overhead, but
2867 * will no longer hit performance.
2868 * This is not applicable to Onstream.
2870 static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
2871 size_t count, loff_t *ppos)
2873 struct ide_tape_obj *tape = ide_tape_f(file);
2874 ide_drive_t *drive = tape->drive;
2875 ssize_t bytes_read,temp, actually_read = 0, rc;
2877 u16 ctl = *(u16 *)&tape->caps[12];
2879 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
2881 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
2882 if (test_bit(IDETAPE_DETECT_BS, &tape->flags))
2883 if (count > tape->blk_size &&
2884 (count % tape->blk_size) == 0)
2885 tape->user_bs_factor = count / tape->blk_size;
2887 if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0)
2891 if (tape->merge_stage_size) {
2892 actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count);
2893 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read))
2895 buf += actually_read;
2896 tape->merge_stage_size -= actually_read;
2897 count -= actually_read;
2899 while (count >= tape->stage_size) {
2900 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
2901 if (bytes_read <= 0)
2903 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read))
2906 count -= bytes_read;
2907 actually_read += bytes_read;
2910 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
2911 if (bytes_read <= 0)
2913 temp = min((unsigned long)count, (unsigned long)bytes_read);
2914 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp))
2916 actually_read += temp;
2917 tape->merge_stage_size = bytes_read-temp;
2920 if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) {
2921 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
2923 idetape_space_over_filemarks(drive, MTFSF, 1);
2927 return (ret) ? ret : actually_read;
2930 static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
2931 size_t count, loff_t *ppos)
2933 struct ide_tape_obj *tape = ide_tape_f(file);
2934 ide_drive_t *drive = tape->drive;
2935 ssize_t actually_written = 0;
2937 u16 ctl = *(u16 *)&tape->caps[12];
2939 /* The drive is write protected. */
2940 if (tape->write_prot)
2943 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
2945 /* Initialize write operation */
2946 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
2947 if (tape->chrdev_dir == IDETAPE_DIR_READ)
2948 idetape_discard_read_pipeline(drive, 1);
2949 if (tape->merge_stage || tape->merge_stage_size) {
2950 printk(KERN_ERR "ide-tape: merge_stage_size "
2951 "should be 0 now\n");
2952 tape->merge_stage_size = 0;
2954 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
2956 tape->chrdev_dir = IDETAPE_DIR_WRITE;
2957 idetape_init_merge_stage(tape);
2960 * Issue a write 0 command to ensure that DSC handshake
2961 * is switched from completion mode to buffer available
2963 * No point in issuing this if DSC overlap isn't supported,
2964 * some drives (Seagate STT3401A) will return an error.
2966 if (drive->dsc_overlap) {
2967 ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
2969 __idetape_kfree_stage(tape->merge_stage);
2970 tape->merge_stage = NULL;
2971 tape->chrdev_dir = IDETAPE_DIR_NONE;
2978 if (tape->restart_speed_control_req)
2979 idetape_restart_speed_control(drive);
2980 if (tape->merge_stage_size) {
2981 if (tape->merge_stage_size >= tape->stage_size) {
2982 printk(KERN_ERR "ide-tape: bug: merge buffer too big\n");
2983 tape->merge_stage_size = 0;
2985 actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count);
2986 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written))
2988 buf += actually_written;
2989 tape->merge_stage_size += actually_written;
2990 count -= actually_written;
2992 if (tape->merge_stage_size == tape->stage_size) {
2994 tape->merge_stage_size = 0;
2995 retval = idetape_add_chrdev_write_request(drive, ctl);
3000 while (count >= tape->stage_size) {
3002 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size))
3004 buf += tape->stage_size;
3005 count -= tape->stage_size;
3006 retval = idetape_add_chrdev_write_request(drive, ctl);
3007 actually_written += tape->stage_size;
3012 actually_written += count;
3013 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count))
3015 tape->merge_stage_size += count;
3017 return (ret) ? ret : actually_written;
3020 static int idetape_write_filemark (ide_drive_t *drive)
3024 /* Write a filemark */
3025 idetape_create_write_filemark_cmd(drive, &pc, 1);
3026 if (idetape_queue_pc_tail(drive, &pc)) {
3027 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
3034 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
3037 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
3038 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
3039 * usually not supported (it is supported in the rare case in which we crossed
3040 * the filemark during our read-ahead pipelined operation mode).
3042 * The following commands are currently not supported:
3044 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
3045 * MT_ST_WRITE_THRESHOLD.
3047 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
3049 idetape_tape_t *tape = drive->driver_data;
3053 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
3056 * Commands which need our pipelined read-ahead stages.
3065 return (idetape_space_over_filemarks(drive,mt_op,mt_count));
3071 if (tape->write_prot)
3073 idetape_discard_read_pipeline(drive, 1);
3074 for (i = 0; i < mt_count; i++) {
3075 retval = idetape_write_filemark(drive);
3081 idetape_discard_read_pipeline(drive, 0);
3082 if (idetape_rewind_tape(drive))
3086 idetape_discard_read_pipeline(drive, 0);
3087 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
3088 return (idetape_queue_pc_tail(drive, &pc));
3092 * If door is locked, attempt to unlock before
3093 * attempting to eject.
3095 if (tape->door_locked) {
3096 if (idetape_create_prevent_cmd(drive, &pc, 0))
3097 if (!idetape_queue_pc_tail(drive, &pc))
3098 tape->door_locked = DOOR_UNLOCKED;
3100 idetape_discard_read_pipeline(drive, 0);
3101 idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK);
3102 retval = idetape_queue_pc_tail(drive, &pc);
3104 clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
3107 idetape_discard_read_pipeline(drive, 0);
3108 return (idetape_flush_tape_buffers(drive));
3110 idetape_discard_read_pipeline(drive, 0);
3111 idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
3112 return (idetape_queue_pc_tail(drive, &pc));
3114 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
3115 return (idetape_queue_pc_tail(drive, &pc));
3117 (void) idetape_rewind_tape(drive);
3118 idetape_create_erase_cmd(&pc);
3119 return (idetape_queue_pc_tail(drive, &pc));
3122 if (mt_count < tape->blk_size ||
3123 mt_count % tape->blk_size)
3125 tape->user_bs_factor = mt_count /
3127 clear_bit(IDETAPE_DETECT_BS, &tape->flags);
3129 set_bit(IDETAPE_DETECT_BS, &tape->flags);
3132 idetape_discard_read_pipeline(drive, 0);
3133 return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0);
3135 idetape_discard_read_pipeline(drive, 0);
3136 return (idetape_position_tape(drive, 0, mt_count, 0));
3140 if (!idetape_create_prevent_cmd(drive, &pc, 1))
3142 retval = idetape_queue_pc_tail(drive, &pc);
3143 if (retval) return retval;
3144 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
3147 if (!idetape_create_prevent_cmd(drive, &pc, 0))
3149 retval = idetape_queue_pc_tail(drive, &pc);
3150 if (retval) return retval;
3151 tape->door_locked = DOOR_UNLOCKED;
3154 printk(KERN_ERR "ide-tape: MTIO operation %d not "
3155 "supported\n", mt_op);
3161 * Our character device ioctls. General mtio.h magnetic io commands are
3162 * supported here, and not in the corresponding block interface. Our own
3163 * ide-tape ioctls are supported on both interfaces.
3165 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
3166 unsigned int cmd, unsigned long arg)
3168 struct ide_tape_obj *tape = ide_tape_f(file);
3169 ide_drive_t *drive = tape->drive;
3173 int block_offset = 0, position = tape->first_frame;
3174 void __user *argp = (void __user *)arg;
3176 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
3178 tape->restart_speed_control_req = 1;
3179 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
3180 idetape_empty_write_pipeline(drive);
3181 idetape_flush_tape_buffers(drive);
3183 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
3184 block_offset = idetape_pipeline_size(drive) /
3185 (tape->blk_size * tape->user_bs_factor);
3186 if ((position = idetape_read_position(drive)) < 0)
3191 if (copy_from_user(&mtop, argp, sizeof (struct mtop)))
3193 return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count));
3195 memset(&mtget, 0, sizeof (struct mtget));
3196 mtget.mt_type = MT_ISSCSI2;
3197 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
3199 ((tape->blk_size * tape->user_bs_factor)
3200 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
3202 if (tape->drv_write_prot) {
3203 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
3205 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
3209 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
3210 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
3214 if (tape->chrdev_dir == IDETAPE_DIR_READ)
3215 idetape_discard_read_pipeline(drive, 1);
3216 return idetape_blkdev_ioctl(drive, cmd, arg);
3221 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
3222 * block size with the reported value.
3224 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
3226 idetape_tape_t *tape = drive->driver_data;
3229 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
3230 if (idetape_queue_pc_tail(drive, &pc)) {
3231 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
3232 if (tape->blk_size == 0) {
3233 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
3234 "block size, assuming 32k\n");
3235 tape->blk_size = 32768;
3239 tape->blk_size = (pc.buffer[4 + 5] << 16) +
3240 (pc.buffer[4 + 6] << 8) +
3242 tape->drv_write_prot = (pc.buffer[2] & 0x80) >> 7;
3246 * Our character device open function.
3248 static int idetape_chrdev_open (struct inode *inode, struct file *filp)
3250 unsigned int minor = iminor(inode), i = minor & ~0xc0;
3252 idetape_tape_t *tape;
3256 if (i >= MAX_HWIFS * MAX_DRIVES)
3259 tape = ide_tape_chrdev_get(i);
3263 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
3266 * We really want to do nonseekable_open(inode, filp); here, but some
3267 * versions of tar incorrectly call lseek on tapes and bail out if that
3268 * fails. So we disallow pread() and pwrite(), but permit lseeks.
3270 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
3272 drive = tape->drive;
3274 filp->private_data = tape;
3276 if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) {
3281 retval = idetape_wait_ready(drive, 60 * HZ);
3283 clear_bit(IDETAPE_BUSY, &tape->flags);
3284 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
3288 idetape_read_position(drive);
3289 if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
3290 (void)idetape_rewind_tape(drive);
3292 if (tape->chrdev_dir != IDETAPE_DIR_READ)
3293 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
3295 /* Read block size and write protect status from drive. */
3296 ide_tape_get_bsize_from_bdesc(drive);
3298 /* Set write protect flag if device is opened as read-only. */
3299 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
3300 tape->write_prot = 1;
3302 tape->write_prot = tape->drv_write_prot;
3304 /* Make sure drive isn't write protected if user wants to write. */
3305 if (tape->write_prot) {
3306 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
3307 (filp->f_flags & O_ACCMODE) == O_RDWR) {
3308 clear_bit(IDETAPE_BUSY, &tape->flags);
3315 * Lock the tape drive door so user can't eject.
3317 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
3318 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
3319 if (!idetape_queue_pc_tail(drive, &pc)) {
3320 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
3321 tape->door_locked = DOOR_LOCKED;
3325 idetape_restart_speed_control(drive);
3326 tape->restart_speed_control_req = 0;
3334 static void idetape_write_release (ide_drive_t *drive, unsigned int minor)
3336 idetape_tape_t *tape = drive->driver_data;
3338 idetape_empty_write_pipeline(drive);
3339 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
3340 if (tape->merge_stage != NULL) {
3341 idetape_pad_zeros(drive, tape->blk_size *
3342 (tape->user_bs_factor - 1));
3343 __idetape_kfree_stage(tape->merge_stage);
3344 tape->merge_stage = NULL;
3346 idetape_write_filemark(drive);
3347 idetape_flush_tape_buffers(drive);
3348 idetape_flush_tape_buffers(drive);
3352 * Our character device release function.
3354 static int idetape_chrdev_release (struct inode *inode, struct file *filp)
3356 struct ide_tape_obj *tape = ide_tape_f(filp);
3357 ide_drive_t *drive = tape->drive;
3359 unsigned int minor = iminor(inode);
3362 tape = drive->driver_data;
3364 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
3366 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
3367 idetape_write_release(drive, minor);
3368 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
3370 idetape_discard_read_pipeline(drive, 1);
3372 idetape_wait_for_pipeline(drive);
3374 if (tape->cache_stage != NULL) {
3375 __idetape_kfree_stage(tape->cache_stage);
3376 tape->cache_stage = NULL;
3378 if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags))
3379 (void) idetape_rewind_tape(drive);
3380 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
3381 if (tape->door_locked == DOOR_LOCKED) {
3382 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
3383 if (!idetape_queue_pc_tail(drive, &pc))
3384 tape->door_locked = DOOR_UNLOCKED;
3388 clear_bit(IDETAPE_BUSY, &tape->flags);
3395 * idetape_identify_device is called to check the contents of the
3396 * ATAPI IDENTIFY command results. We return:
3398 * 1 If the tape can be supported by us, based on the information
3401 * 0 If this tape driver is not currently supported by us.
3403 static int idetape_identify_device (ide_drive_t *drive)
3405 struct idetape_id_gcw gcw;
3406 struct hd_driveid *id = drive->id;
3408 if (drive->id_read == 0)
3411 *((unsigned short *) &gcw) = id->config;
3413 /* Check that we can support this device */
3415 if (gcw.protocol != 2)
3416 printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n",
3418 else if (gcw.device_type != 1)
3419 printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set "
3420 "to tape\n", gcw.device_type);
3421 else if (!gcw.removable)
3422 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
3423 else if (gcw.packet_size != 0) {
3424 printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12 "
3425 "bytes long\n", gcw.packet_size);
3431 static void idetape_get_inquiry_results(ide_drive_t *drive)
3433 idetape_tape_t *tape = drive->driver_data;
3435 char fw_rev[6], vendor_id[10], product_id[18];
3437 idetape_create_inquiry_cmd(&pc);
3438 if (idetape_queue_pc_tail(drive, &pc)) {
3439 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
3443 memcpy(vendor_id, &pc.buffer[8], 8);
3444 memcpy(product_id, &pc.buffer[16], 16);
3445 memcpy(fw_rev, &pc.buffer[32], 4);
3447 ide_fixstring(vendor_id, 10, 0);
3448 ide_fixstring(product_id, 18, 0);
3449 ide_fixstring(fw_rev, 6, 0);
3451 printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n",
3452 drive->name, tape->name, vendor_id, product_id, fw_rev);
3456 * Ask the tape about its various parameters. In particular, we will adjust our
3457 * data transfer buffer size to the recommended value as returned by the tape.
3459 static void idetape_get_mode_sense_results (ide_drive_t *drive)
3461 idetape_tape_t *tape = drive->driver_data;
3464 u8 speed, max_speed;
3466 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
3467 if (idetape_queue_pc_tail(drive, &pc)) {
3468 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
3469 " some default values\n");
3470 tape->blk_size = 512;
3471 put_unaligned(52, (u16 *)&tape->caps[12]);
3472 put_unaligned(540, (u16 *)&tape->caps[14]);
3473 put_unaligned(6*52, (u16 *)&tape->caps[16]);
3476 caps = pc.buffer + 4 + pc.buffer[3];
3478 /* convert to host order and save for later use */
3479 speed = be16_to_cpu(*(u16 *)&caps[14]);
3480 max_speed = be16_to_cpu(*(u16 *)&caps[8]);
3482 put_unaligned(max_speed, (u16 *)&caps[8]);
3483 put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]);
3484 put_unaligned(speed, (u16 *)&caps[14]);
3485 put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]);
3488 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
3489 "(assuming 650KB/sec)\n", drive->name);
3490 put_unaligned(650, (u16 *)&caps[14]);
3493 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
3494 "(assuming 650KB/sec)\n", drive->name);
3495 put_unaligned(650, (u16 *)&caps[8]);
3498 memcpy(&tape->caps, caps, 20);
3500 tape->blk_size = 512;
3501 else if (caps[7] & 0x04)
3502 tape->blk_size = 1024;
3505 #ifdef CONFIG_IDE_PROC_FS
3506 static void idetape_add_settings (ide_drive_t *drive)
3508 idetape_tape_t *tape = drive->driver_data;
3511 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
3513 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
3514 1, 2, (u16 *)&tape->caps[16], NULL);
3515 ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
3516 ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL);
3517 ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
3518 ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL);
3519 ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL);
3520 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
3521 1, 1, (u16 *)&tape->caps[14], NULL);
3522 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1,
3523 1024, &tape->stage_size, NULL);
3524 ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN,
3525 IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq,
3527 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
3528 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL);
3529 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL);
3530 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL);
3531 ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1,
3532 1, &tape->debug_mask, NULL);
3535 static inline void idetape_add_settings(ide_drive_t *drive) { ; }
3539 * ide_setup is called to:
3541 * 1. Initialize our various state variables.
3542 * 2. Ask the tape for its capabilities.
3543 * 3. Allocate a buffer which will be used for data
3544 * transfer. The buffer size is chosen based on
3545 * the recommendation which we received in step (2).
3547 * Note that at this point ide.c already assigned us an irq, so that
3548 * we can queue requests here and wait for their completion.
3550 static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
3552 unsigned long t1, tmid, tn, t;
3554 struct idetape_id_gcw gcw;
3557 u16 *ctl = (u16 *)&tape->caps[12];
3559 spin_lock_init(&tape->lock);
3560 drive->dsc_overlap = 1;
3561 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
3562 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
3564 drive->dsc_overlap = 0;
3566 /* Seagate Travan drives do not support DSC overlap. */
3567 if (strstr(drive->id->model, "Seagate STT3401"))
3568 drive->dsc_overlap = 0;
3569 tape->minor = minor;
3570 tape->name[0] = 'h';
3571 tape->name[1] = 't';
3572 tape->name[2] = '0' + minor;
3573 tape->chrdev_dir = IDETAPE_DIR_NONE;
3574 tape->pc = tape->pc_stack;
3575 tape->max_insert_speed = 10000;
3576 tape->speed_control = 1;
3577 *((unsigned short *) &gcw) = drive->id->config;
3578 if (gcw.drq_type == 1)
3579 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags);
3581 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10;
3583 idetape_get_inquiry_results(drive);
3584 idetape_get_mode_sense_results(drive);
3585 ide_tape_get_bsize_from_bdesc(drive);
3586 tape->user_bs_factor = 1;
3587 tape->stage_size = *ctl * tape->blk_size;
3588 while (tape->stage_size > 0xffff) {
3589 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
3591 tape->stage_size = *ctl * tape->blk_size;
3593 stage_size = tape->stage_size;
3594 tape->pages_per_stage = stage_size / PAGE_SIZE;
3595 if (stage_size % PAGE_SIZE) {
3596 tape->pages_per_stage++;
3597 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
3600 /* Select the "best" DSC read/write polling freq and pipeline size. */
3601 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
3603 tape->max_stages = speed * 1000 * 10 / tape->stage_size;
3606 * Limit memory use for pipeline to 10% of physical memory
3609 if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10)
3610 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size);
3611 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
3612 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
3613 tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
3614 if (tape->max_stages == 0)
3615 tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1;
3617 t1 = (tape->stage_size * HZ) / (speed * 1000);
3618 tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125);
3619 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
3621 if (tape->max_stages)
3627 * Ensure that the number we got makes sense; limit
3628 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
3630 tape->best_dsc_rw_freq = max_t(unsigned long,
3631 min_t(unsigned long, t, IDETAPE_DSC_RW_MAX),
3632 IDETAPE_DSC_RW_MIN);
3633 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
3634 "%dkB pipeline, %lums tDSC%s\n",
3635 drive->name, tape->name, *(u16 *)&tape->caps[14],
3636 (*(u16 *)&tape->caps[16] * 512) / tape->stage_size,
3637 tape->stage_size / 1024,
3638 tape->max_stages * tape->stage_size / 1024,
3639 tape->best_dsc_rw_freq * 1000 / HZ,
3640 drive->using_dma ? ", DMA":"");
3642 idetape_add_settings(drive);
3645 static void ide_tape_remove(ide_drive_t *drive)
3647 idetape_tape_t *tape = drive->driver_data;
3649 ide_proc_unregister_driver(drive, tape->driver);
3651 ide_unregister_region(tape->disk);
3656 static void ide_tape_release(struct kref *kref)
3658 struct ide_tape_obj *tape = to_ide_tape(kref);
3659 ide_drive_t *drive = tape->drive;
3660 struct gendisk *g = tape->disk;
3662 BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
3664 drive->dsc_overlap = 0;
3665 drive->driver_data = NULL;
3666 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
3667 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128));
3668 idetape_devs[tape->minor] = NULL;
3669 g->private_data = NULL;
3674 #ifdef CONFIG_IDE_PROC_FS
3675 static int proc_idetape_read_name
3676 (char *page, char **start, off_t off, int count, int *eof, void *data)
3678 ide_drive_t *drive = (ide_drive_t *) data;
3679 idetape_tape_t *tape = drive->driver_data;
3683 len = sprintf(out, "%s\n", tape->name);
3684 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
3687 static ide_proc_entry_t idetape_proc[] = {
3688 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
3689 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
3690 { NULL, 0, NULL, NULL }
3694 static int ide_tape_probe(ide_drive_t *);
3696 static ide_driver_t idetape_driver = {
3698 .owner = THIS_MODULE,
3700 .bus = &ide_bus_type,
3702 .probe = ide_tape_probe,
3703 .remove = ide_tape_remove,
3704 .version = IDETAPE_VERSION,
3706 .supports_dsc_overlap = 1,
3707 .do_request = idetape_do_request,
3708 .end_request = idetape_end_request,
3709 .error = __ide_error,
3710 .abort = __ide_abort,
3711 #ifdef CONFIG_IDE_PROC_FS
3712 .proc = idetape_proc,
3717 * Our character device supporting functions, passed to register_chrdev.
3719 static const struct file_operations idetape_fops = {
3720 .owner = THIS_MODULE,
3721 .read = idetape_chrdev_read,
3722 .write = idetape_chrdev_write,
3723 .ioctl = idetape_chrdev_ioctl,
3724 .open = idetape_chrdev_open,
3725 .release = idetape_chrdev_release,
3728 static int idetape_open(struct inode *inode, struct file *filp)
3730 struct gendisk *disk = inode->i_bdev->bd_disk;
3731 struct ide_tape_obj *tape;
3733 if (!(tape = ide_tape_get(disk)))
3739 static int idetape_release(struct inode *inode, struct file *filp)
3741 struct gendisk *disk = inode->i_bdev->bd_disk;
3742 struct ide_tape_obj *tape = ide_tape_g(disk);
3749 static int idetape_ioctl(struct inode *inode, struct file *file,
3750 unsigned int cmd, unsigned long arg)
3752 struct block_device *bdev = inode->i_bdev;
3753 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
3754 ide_drive_t *drive = tape->drive;
3755 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
3757 err = idetape_blkdev_ioctl(drive, cmd, arg);
3761 static struct block_device_operations idetape_block_ops = {
3762 .owner = THIS_MODULE,
3763 .open = idetape_open,
3764 .release = idetape_release,
3765 .ioctl = idetape_ioctl,
3768 static int ide_tape_probe(ide_drive_t *drive)
3770 idetape_tape_t *tape;
3774 if (!strstr("ide-tape", drive->driver_req))
3776 if (!drive->present)
3778 if (drive->media != ide_tape)
3780 if (!idetape_identify_device (drive)) {
3781 printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
3785 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name);
3788 if (strstr(drive->id->model, "OnStream DI-")) {
3789 printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name);
3790 printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n");
3792 tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL);
3794 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
3798 g = alloc_disk(1 << PARTN_BITS);
3802 ide_init_disk(g, drive);
3804 ide_proc_register_driver(drive, &idetape_driver);
3806 kref_init(&tape->kref);
3808 tape->drive = drive;
3809 tape->driver = &idetape_driver;
3812 g->private_data = &tape->driver;
3814 drive->driver_data = tape;
3816 mutex_lock(&idetape_ref_mutex);
3817 for (minor = 0; idetape_devs[minor]; minor++)
3819 idetape_devs[minor] = tape;
3820 mutex_unlock(&idetape_ref_mutex);
3822 idetape_setup(drive, tape, minor);
3824 device_create(idetape_sysfs_class, &drive->gendev,
3825 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name);
3826 device_create(idetape_sysfs_class, &drive->gendev,
3827 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name);
3829 g->fops = &idetape_block_ops;
3830 ide_register_region(g);
3840 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
3841 MODULE_LICENSE("GPL");
3843 static void __exit idetape_exit (void)
3845 driver_unregister(&idetape_driver.gen_driver);
3846 class_destroy(idetape_sysfs_class);
3847 unregister_chrdev(IDETAPE_MAJOR, "ht");
3850 static int __init idetape_init(void)
3853 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
3854 if (IS_ERR(idetape_sysfs_class)) {
3855 idetape_sysfs_class = NULL;
3856 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
3861 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
3862 printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
3864 goto out_free_class;
3867 error = driver_register(&idetape_driver.gen_driver);
3869 goto out_free_driver;
3874 driver_unregister(&idetape_driver.gen_driver);
3876 class_destroy(idetape_sysfs_class);
3881 MODULE_ALIAS("ide:*m-tape*");
3882 module_init(idetape_init);
3883 module_exit(idetape_exit);
3884 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);