2 * IDE ATAPI streaming tape driver.
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
18 #define IDETAPE_VERSION "1.19"
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/timer.h>
27 #include <linux/interrupt.h>
28 #include <linux/jiffies.h>
29 #include <linux/major.h>
30 #include <linux/errno.h>
31 #include <linux/genhd.h>
32 #include <linux/slab.h>
33 #include <linux/pci.h>
34 #include <linux/ide.h>
35 #include <linux/smp_lock.h>
36 #include <linux/completion.h>
37 #include <linux/bitops.h>
38 #include <linux/mutex.h>
40 #include <asm/byteorder.h>
42 #include <asm/uaccess.h>
44 #include <asm/unaligned.h>
49 typedef struct os_partition_s {
53 __u32 first_frame_addr;
54 __u32 last_frame_addr;
61 typedef struct os_dat_entry_s {
71 #define OS_DAT_FLAGS_DATA (0xc)
72 #define OS_DAT_FLAGS_MARK (0x1)
74 typedef struct os_dat_s {
79 os_dat_entry_t dat_list[16];
82 #include <linux/mtio.h>
84 /**************************** Tunable parameters *****************************/
88 * Pipelined mode parameters.
90 * We try to use the minimum number of stages which is enough to
91 * keep the tape constantly streaming. To accomplish that, we implement
92 * a feedback loop around the maximum number of stages:
94 * We start from MIN maximum stages (we will not even use MIN stages
95 * if we don't need them), increment it by RATE*(MAX-MIN)
96 * whenever we sense that the pipeline is empty, until we reach
97 * the optimum value or until we reach MAX.
99 * Setting the following parameter to 0 is illegal: the pipelined mode
100 * cannot be disabled (calculate_speeds() divides by tape->max_stages.)
102 #define IDETAPE_MIN_PIPELINE_STAGES 1
103 #define IDETAPE_MAX_PIPELINE_STAGES 400
104 #define IDETAPE_INCREASE_STAGES_RATE 20
107 * The following are used to debug the driver:
109 * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control.
111 * Setting them to 0 will restore normal operation mode:
113 * 1. Disable logging normal successful operations.
114 * 2. Disable self-sanity checks.
115 * 3. Errors will still be logged, of course.
117 * All the #if DEBUG code will be removed some day, when the driver
118 * is verified to be stable enough. This will make it much more
121 #define IDETAPE_DEBUG_LOG 0
124 * After each failed packet command we issue a request sense command
125 * and retry the packet command IDETAPE_MAX_PC_RETRIES times.
127 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
129 #define IDETAPE_MAX_PC_RETRIES 3
132 * With each packet command, we allocate a buffer of
133 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
134 * commands (Not for READ/WRITE commands).
136 #define IDETAPE_PC_BUFFER_SIZE 256
139 * In various places in the driver, we need to allocate storage
140 * for packet commands and requests, which will remain valid while
141 * we leave the driver to wait for an interrupt or a timeout event.
143 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
146 * Some drives (for example, Seagate STT3401A Travan) require a very long
147 * timeout, because they don't return an interrupt or clear their busy bit
148 * until after the command completes (even retension commands).
150 #define IDETAPE_WAIT_CMD (900*HZ)
153 * The following parameter is used to select the point in the internal
154 * tape fifo in which we will start to refill the buffer. Decreasing
155 * the following parameter will improve the system's latency and
156 * interactive response, while using a high value might improve system
159 #define IDETAPE_FIFO_THRESHOLD 2
162 * DSC polling parameters.
164 * Polling for DSC (a single bit in the status register) is a very
165 * important function in ide-tape. There are two cases in which we
168 * 1. Before a read/write packet command, to ensure that we
169 * can transfer data from/to the tape's data buffers, without
170 * causing an actual media access. In case the tape is not
171 * ready yet, we take out our request from the device
172 * request queue, so that ide.c will service requests from
173 * the other device on the same interface meanwhile.
175 * 2. After the successful initialization of a "media access
176 * packet command", which is a command which can take a long
177 * time to complete (it can be several seconds or even an hour).
179 * Again, we postpone our request in the middle to free the bus
180 * for the other device. The polling frequency here should be
181 * lower than the read/write frequency since those media access
182 * commands are slow. We start from a "fast" frequency -
183 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
184 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
185 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
187 * We also set a timeout for the timer, in case something goes wrong.
188 * The timeout should be longer then the maximum execution time of a
195 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
196 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
197 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
198 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
199 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
200 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
201 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
203 /*************************** End of tunable parameters ***********************/
206 * Read/Write error simulation
208 #define SIMULATE_ERRORS 0
211 * For general magnetic tape device compatibility.
214 idetape_direction_none,
215 idetape_direction_read,
216 idetape_direction_write
217 } idetape_chrdev_direction_t;
222 struct idetape_bh *b_reqnext;
227 * Our view of a packet command.
229 typedef struct idetape_packet_command_s {
230 u8 c[12]; /* Actual packet bytes */
231 int retries; /* On each retry, we increment retries */
232 int error; /* Error code */
233 int request_transfer; /* Bytes to transfer */
234 int actually_transferred; /* Bytes actually transferred */
235 int buffer_size; /* Size of our data buffer */
236 struct idetape_bh *bh;
239 u8 *buffer; /* Data buffer */
240 u8 *current_position; /* Pointer into the above buffer */
241 ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */
242 u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */
243 unsigned long flags; /* Status/Action bit flags: long for set_bit */
247 * Packet command flag bits.
249 /* Set when an error is considered normal - We won't retry */
251 /* 1 When polling for DSC on a media access command */
252 #define PC_WAIT_FOR_DSC 1
253 /* 1 when we prefer to use DMA if possible */
254 #define PC_DMA_RECOMMENDED 2
255 /* 1 while DMA in progress */
256 #define PC_DMA_IN_PROGRESS 3
257 /* 1 when encountered problem during DMA */
258 #define PC_DMA_ERROR 4
266 unsigned page_code :6; /* Page code - Should be 0x30 */
267 unsigned reserved1_6 :1;
269 __u8 page_length; /* Page Length - Should be 2 */
272 unsigned play32_5 :1;
273 unsigned reserved2_23 :2;
274 unsigned record32 :1;
275 unsigned record32_5 :1;
276 unsigned reserved2_6 :1;
278 } idetape_block_size_page_t;
283 typedef struct idetape_stage_s {
284 struct request rq; /* The corresponding request */
285 struct idetape_bh *bh; /* The data buffers */
286 struct idetape_stage_s *next; /* Pointer to the next stage */
290 * Most of our global data which we need to save even as we leave the
291 * driver due to an interrupt or a timer event is stored in a variable
292 * of type idetape_tape_t, defined below.
294 typedef struct ide_tape_obj {
296 ide_driver_t *driver;
297 struct gendisk *disk;
301 * Since a typical character device operation requires more
302 * than one packet command, we provide here enough memory
303 * for the maximum of interconnected packet commands.
304 * The packet commands are stored in the circular array pc_stack.
305 * pc_stack_index points to the last used entry, and warps around
306 * to the start when we get to the last array entry.
308 * pc points to the current processed packet command.
310 * failed_pc points to the last failed packet command, or contains
311 * NULL if we do not need to retry any packet command. This is
312 * required since an additional packet command is needed before the
313 * retry, to get detailed information on what went wrong.
315 /* Current packet command */
317 /* Last failed packet command */
318 idetape_pc_t *failed_pc;
319 /* Packet command stack */
320 idetape_pc_t pc_stack[IDETAPE_PC_STACK];
321 /* Next free packet command storage space */
323 struct request rq_stack[IDETAPE_PC_STACK];
324 /* We implement a circular array */
328 * DSC polling variables.
330 * While polling for DSC we use postponed_rq to postpone the
331 * current request so that ide.c will be able to service
332 * pending requests on the other device. Note that at most
333 * we will have only one DSC (usually data transfer) request
334 * in the device request queue. Additional requests can be
335 * queued in our internal pipeline, but they will be visible
336 * to ide.c only one at a time.
338 struct request *postponed_rq;
339 /* The time in which we started polling for DSC */
340 unsigned long dsc_polling_start;
341 /* Timer used to poll for dsc */
342 struct timer_list dsc_timer;
343 /* Read/Write dsc polling frequency */
344 unsigned long best_dsc_rw_frequency;
345 /* The current polling frequency */
346 unsigned long dsc_polling_frequency;
347 /* Maximum waiting time */
348 unsigned long dsc_timeout;
351 * Read position information
355 unsigned int first_frame_position;
356 unsigned int last_frame_position;
357 unsigned int blocks_in_buffer;
360 * Last error information
362 u8 sense_key, asc, ascq;
365 * Character device operation
370 /* Current character device data transfer direction */
371 idetape_chrdev_direction_t chrdev_direction;
376 /* Usually 512 or 1024 bytes */
377 unsigned short tape_block_size;
380 /* Copy of the tape's Capabilities and Mechanical Page */
384 * Active data transfer request parameters.
386 * At most, there is only one ide-tape originated data transfer
387 * request in the device request queue. This allows ide.c to
388 * easily service requests from the other device when we
389 * postpone our active request. In the pipelined operation
390 * mode, we use our internal pipeline structure to hold
391 * more data requests.
393 * The data buffer size is chosen based on the tape's
396 /* Pointer to the request which is waiting in the device request queue */
397 struct request *active_data_request;
398 /* Data buffer size (chosen based on the tape's recommendation */
400 idetape_stage_t *merge_stage;
401 int merge_stage_size;
402 struct idetape_bh *bh;
407 * Pipeline parameters.
409 * To accomplish non-pipelined mode, we simply set the following
410 * variables to zero (or NULL, where appropriate).
412 /* Number of currently used stages */
414 /* Number of pending stages */
415 int nr_pending_stages;
416 /* We will not allocate more than this number of stages */
417 int max_stages, min_pipeline, max_pipeline;
418 /* The first stage which will be removed from the pipeline */
419 idetape_stage_t *first_stage;
420 /* The currently active stage */
421 idetape_stage_t *active_stage;
422 /* Will be serviced after the currently active request */
423 idetape_stage_t *next_stage;
424 /* New requests will be added to the pipeline here */
425 idetape_stage_t *last_stage;
426 /* Optional free stage which we can use */
427 idetape_stage_t *cache_stage;
429 /* Wasted space in each stage */
432 /* Status/Action flags: long for set_bit */
434 /* protects the ide-tape queue */
438 * Measures average tape speed
440 unsigned long avg_time;
446 char firmware_revision[6];
447 int firmware_revision_num;
449 /* the door is currently locked */
451 /* the tape hardware is write protected */
453 /* the tape is write protected (hardware or opened as read-only) */
457 * Limit the number of times a request can
458 * be postponed, to avoid an infinite postpone
461 /* request postpone count limit */
465 * Measures number of frames:
467 * 1. written/read to/from the driver pipeline (pipeline_head).
468 * 2. written/read to/from the tape buffers (idetape_bh).
469 * 3. written/read by the tape to/from the media (tape_head).
477 * Speed control at the tape buffers input/output
479 unsigned long insert_time;
482 int max_insert_speed;
483 int measure_insert_time;
486 * Measure tape still time, in milliseconds
488 unsigned long tape_still_time_begin;
492 * Speed regulation negative feedback loop
495 int pipeline_head_speed;
496 int controlled_pipeline_head_speed;
497 int uncontrolled_pipeline_head_speed;
498 int controlled_last_pipeline_head;
499 int uncontrolled_last_pipeline_head;
500 unsigned long uncontrolled_pipeline_head_time;
501 unsigned long controlled_pipeline_head_time;
502 int controlled_previous_pipeline_head;
503 int uncontrolled_previous_pipeline_head;
504 unsigned long controlled_previous_head_time;
505 unsigned long uncontrolled_previous_head_time;
506 int restart_speed_control_req;
509 * Debug_level determines amount of debugging output;
510 * can be changed using /proc/ide/hdx/settings
511 * 0 : almost no debugging output
512 * 1 : 0+output errors only
513 * 2 : 1+output all sensekey/asc
514 * 3 : 2+follow all chrdev related procedures
515 * 4 : 3+follow all procedures
516 * 5 : 4+include pc_stack rq_stack info
517 * 6 : 5+USE_COUNT updates
522 static DEFINE_MUTEX(idetape_ref_mutex);
524 static struct class *idetape_sysfs_class;
526 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
528 #define ide_tape_g(disk) \
529 container_of((disk)->private_data, struct ide_tape_obj, driver)
531 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
533 struct ide_tape_obj *tape = NULL;
535 mutex_lock(&idetape_ref_mutex);
536 tape = ide_tape_g(disk);
538 kref_get(&tape->kref);
539 mutex_unlock(&idetape_ref_mutex);
543 static void ide_tape_release(struct kref *);
545 static void ide_tape_put(struct ide_tape_obj *tape)
547 mutex_lock(&idetape_ref_mutex);
548 kref_put(&tape->kref, ide_tape_release);
549 mutex_unlock(&idetape_ref_mutex);
555 #define DOOR_UNLOCKED 0
556 #define DOOR_LOCKED 1
557 #define DOOR_EXPLICITLY_LOCKED 2
560 * Tape flag bits values.
562 #define IDETAPE_IGNORE_DSC 0
563 #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
564 #define IDETAPE_BUSY 2 /* Device already opened */
565 #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
566 #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
567 #define IDETAPE_FILEMARK 5 /* Currently on a filemark */
568 #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
569 #define IDETAPE_READ_ERROR 7
570 #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
571 /* 0 = no tape is loaded, so we don't rewind after ejecting */
572 #define IDETAPE_MEDIUM_PRESENT 9
575 * Supported ATAPI tape drives packet commands
577 #define IDETAPE_TEST_UNIT_READY_CMD 0x00
578 #define IDETAPE_REWIND_CMD 0x01
579 #define IDETAPE_REQUEST_SENSE_CMD 0x03
580 #define IDETAPE_READ_CMD 0x08
581 #define IDETAPE_WRITE_CMD 0x0a
582 #define IDETAPE_WRITE_FILEMARK_CMD 0x10
583 #define IDETAPE_SPACE_CMD 0x11
584 #define IDETAPE_INQUIRY_CMD 0x12
585 #define IDETAPE_ERASE_CMD 0x19
586 #define IDETAPE_MODE_SENSE_CMD 0x1a
587 #define IDETAPE_MODE_SELECT_CMD 0x15
588 #define IDETAPE_LOAD_UNLOAD_CMD 0x1b
589 #define IDETAPE_PREVENT_CMD 0x1e
590 #define IDETAPE_LOCATE_CMD 0x2b
591 #define IDETAPE_READ_POSITION_CMD 0x34
592 #define IDETAPE_READ_BUFFER_CMD 0x3c
593 #define IDETAPE_SET_SPEED_CMD 0xbb
596 * Some defines for the READ BUFFER command
598 #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
601 * Some defines for the SPACE command
603 #define IDETAPE_SPACE_OVER_FILEMARK 1
604 #define IDETAPE_SPACE_TO_EOD 3
607 * Some defines for the LOAD UNLOAD command
609 #define IDETAPE_LU_LOAD_MASK 1
610 #define IDETAPE_LU_RETENSION_MASK 2
611 #define IDETAPE_LU_EOT_MASK 4
614 * Special requests for our block device strategy routine.
616 * In order to service a character device command, we add special
617 * requests to the tail of our block device request queue and wait
618 * for their completion.
622 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
623 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
624 REQ_IDETAPE_READ = (1 << 2),
625 REQ_IDETAPE_WRITE = (1 << 3),
626 REQ_IDETAPE_READ_BUFFER = (1 << 4),
630 * Error codes which are returned in rq->errors to the higher part
633 #define IDETAPE_ERROR_GENERAL 101
634 #define IDETAPE_ERROR_FILEMARK 102
635 #define IDETAPE_ERROR_EOD 103
638 * The following is used to format the general configuration word of
639 * the ATAPI IDENTIFY DEVICE command.
641 struct idetape_id_gcw {
642 unsigned packet_size :2; /* Packet Size */
643 unsigned reserved234 :3; /* Reserved */
644 unsigned drq_type :2; /* Command packet DRQ type */
645 unsigned removable :1; /* Removable media */
646 unsigned device_type :5; /* Device type */
647 unsigned reserved13 :1; /* Reserved */
648 unsigned protocol :2; /* Protocol type */
652 * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C)
655 unsigned device_type :5; /* Peripheral Device Type */
656 unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */
657 unsigned reserved1_6t0 :7; /* Reserved */
658 unsigned rmb :1; /* Removable Medium Bit */
659 unsigned ansi_version :3; /* ANSI Version */
660 unsigned ecma_version :3; /* ECMA Version */
661 unsigned iso_version :2; /* ISO Version */
662 unsigned response_format :4; /* Response Data Format */
663 unsigned reserved3_45 :2; /* Reserved */
664 unsigned reserved3_6 :1; /* TrmIOP - Reserved */
665 unsigned reserved3_7 :1; /* AENC - Reserved */
666 __u8 additional_length; /* Additional Length (total_length-4) */
667 __u8 rsv5, rsv6, rsv7; /* Reserved */
668 __u8 vendor_id[8]; /* Vendor Identification */
669 __u8 product_id[16]; /* Product Identification */
670 __u8 revision_level[4]; /* Revision Level */
671 __u8 vendor_specific[20]; /* Vendor Specific - Optional */
672 __u8 reserved56t95[40]; /* Reserved - Optional */
673 /* Additional information may be returned */
674 } idetape_inquiry_result_t;
677 * READ POSITION packet command - Data Format (From Table 6-57)
680 unsigned reserved0_10 :2; /* Reserved */
681 unsigned bpu :1; /* Block Position Unknown */
682 unsigned reserved0_543 :3; /* Reserved */
683 unsigned eop :1; /* End Of Partition */
684 unsigned bop :1; /* Beginning Of Partition */
685 u8 partition; /* Partition Number */
686 u8 reserved2, reserved3; /* Reserved */
687 u32 first_block; /* First Block Location */
688 u32 last_block; /* Last Block Location (Optional) */
689 u8 reserved12; /* Reserved */
690 u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */
691 u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */
692 } idetape_read_position_result_t;
695 * Follows structures which are related to the SELECT SENSE / MODE SENSE
696 * packet commands. Those packet commands are still not supported
699 #define IDETAPE_BLOCK_DESCRIPTOR 0
700 #define IDETAPE_CAPABILITIES_PAGE 0x2a
701 #define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */
702 #define IDETAPE_BLOCK_SIZE_PAGE 0x30
703 #define IDETAPE_BUFFER_FILLING_PAGE 0x33
706 * Mode Parameter Block Descriptor the MODE SENSE packet command
708 * Support for block descriptors is optional.
711 __u8 density_code; /* Medium density code */
712 __u8 blocks[3]; /* Number of blocks */
713 __u8 reserved4; /* Reserved */
714 __u8 length[3]; /* Block Length */
715 } idetape_parameter_block_descriptor_t;
718 * The Data Compression Page, as returned by the MODE SENSE packet command.
721 unsigned page_code :6; /* Page Code - Should be 0xf */
722 unsigned reserved0 :1; /* Reserved */
724 __u8 page_length; /* Page Length - Should be 14 */
725 unsigned reserved2 :6; /* Reserved */
726 unsigned dcc :1; /* Data Compression Capable */
727 unsigned dce :1; /* Data Compression Enable */
728 unsigned reserved3 :5; /* Reserved */
729 unsigned red :2; /* Report Exception on Decompression */
730 unsigned dde :1; /* Data Decompression Enable */
731 __u32 ca; /* Compression Algorithm */
732 __u32 da; /* Decompression Algorithm */
733 __u8 reserved[4]; /* Reserved */
734 } idetape_data_compression_page_t;
737 * The Medium Partition Page, as returned by the MODE SENSE packet command.
740 unsigned page_code :6; /* Page Code - Should be 0x11 */
741 unsigned reserved1_6 :1; /* Reserved */
743 __u8 page_length; /* Page Length - Should be 6 */
744 __u8 map; /* Maximum Additional Partitions - Should be 0 */
745 __u8 apd; /* Additional Partitions Defined - Should be 0 */
746 unsigned reserved4_012 :3; /* Reserved */
747 unsigned psum :2; /* Should be 0 */
748 unsigned idp :1; /* Should be 0 */
749 unsigned sdp :1; /* Should be 0 */
750 unsigned fdp :1; /* Fixed Data Partitions */
751 __u8 mfr; /* Medium Format Recognition */
752 __u8 reserved[2]; /* Reserved */
753 } idetape_medium_partition_page_t;
756 * Run time configurable parameters.
759 int dsc_rw_frequency;
760 int dsc_media_access_frequency;
765 * The variables below are used for the character device interface.
766 * Additional state variables are defined in our ide_drive_t structure.
768 static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES];
770 #define ide_tape_f(file) ((file)->private_data)
772 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
774 struct ide_tape_obj *tape = NULL;
776 mutex_lock(&idetape_ref_mutex);
777 tape = idetape_devs[i];
779 kref_get(&tape->kref);
780 mutex_unlock(&idetape_ref_mutex);
785 * Function declarations
788 static int idetape_chrdev_release (struct inode *inode, struct file *filp);
789 static void idetape_write_release (ide_drive_t *drive, unsigned int minor);
792 * Too bad. The drive wants to send us data which we are not ready to accept.
793 * Just throw it away.
795 static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount)
798 (void) HWIF(drive)->INB(IDE_DATA_REG);
801 static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
803 struct idetape_bh *bh = pc->bh;
808 printk(KERN_ERR "ide-tape: bh == NULL in "
809 "idetape_input_buffers\n");
810 idetape_discard_data(drive, bcount);
813 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount);
814 HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count);
816 atomic_add(count, &bh->b_count);
817 if (atomic_read(&bh->b_count) == bh->b_size) {
820 atomic_set(&bh->b_count, 0);
826 static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
828 struct idetape_bh *bh = pc->bh;
833 printk(KERN_ERR "ide-tape: bh == NULL in "
834 "idetape_output_buffers\n");
837 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
838 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
841 pc->b_count -= count;
843 pc->bh = bh = bh->b_reqnext;
845 pc->b_data = bh->b_data;
846 pc->b_count = atomic_read(&bh->b_count);
852 static void idetape_update_buffers (idetape_pc_t *pc)
854 struct idetape_bh *bh = pc->bh;
856 unsigned int bcount = pc->actually_transferred;
858 if (test_bit(PC_WRITING, &pc->flags))
862 printk(KERN_ERR "ide-tape: bh == NULL in "
863 "idetape_update_buffers\n");
866 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
867 atomic_set(&bh->b_count, count);
868 if (atomic_read(&bh->b_count) == bh->b_size)
876 * idetape_next_pc_storage returns a pointer to a place in which we can
877 * safely store a packet command, even though we intend to leave the
878 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
879 * commands is allocated at initialization time.
881 static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive)
883 idetape_tape_t *tape = drive->driver_data;
885 #if IDETAPE_DEBUG_LOG
886 if (tape->debug_level >= 5)
887 printk(KERN_INFO "ide-tape: pc_stack_index=%d\n",
888 tape->pc_stack_index);
889 #endif /* IDETAPE_DEBUG_LOG */
890 if (tape->pc_stack_index == IDETAPE_PC_STACK)
891 tape->pc_stack_index=0;
892 return (&tape->pc_stack[tape->pc_stack_index++]);
896 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
897 * Since we queue packet commands in the request queue, we need to
898 * allocate a request, along with the allocation of a packet command.
901 /**************************************************************
903 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
904 * followed later on by kfree(). -ml *
906 **************************************************************/
908 static struct request *idetape_next_rq_storage (ide_drive_t *drive)
910 idetape_tape_t *tape = drive->driver_data;
912 #if IDETAPE_DEBUG_LOG
913 if (tape->debug_level >= 5)
914 printk(KERN_INFO "ide-tape: rq_stack_index=%d\n",
915 tape->rq_stack_index);
916 #endif /* IDETAPE_DEBUG_LOG */
917 if (tape->rq_stack_index == IDETAPE_PC_STACK)
918 tape->rq_stack_index=0;
919 return (&tape->rq_stack[tape->rq_stack_index++]);
923 * idetape_init_pc initializes a packet command.
925 static void idetape_init_pc (idetape_pc_t *pc)
927 memset(pc->c, 0, 12);
930 pc->request_transfer = 0;
931 pc->buffer = pc->pc_buffer;
932 pc->buffer_size = IDETAPE_PC_BUFFER_SIZE;
938 * called on each failed packet command retry to analyze the request sense. We
939 * currently do not utilize this information.
941 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
943 idetape_tape_t *tape = drive->driver_data;
944 idetape_pc_t *pc = tape->failed_pc;
946 tape->sense_key = sense[2] & 0xF;
947 tape->asc = sense[12];
948 tape->ascq = sense[13];
949 #if IDETAPE_DEBUG_LOG
951 * Without debugging, we only log an error if we decided to give up
954 if (tape->debug_level >= 1)
955 printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, "
956 "asc = %x, ascq = %x\n",
957 pc->c[0], tape->sense_key,
958 tape->asc, tape->ascq);
959 #endif /* IDETAPE_DEBUG_LOG */
961 /* Correct pc->actually_transferred by asking the tape. */
962 if (test_bit(PC_DMA_ERROR, &pc->flags)) {
963 pc->actually_transferred = pc->request_transfer -
964 tape->tape_block_size *
965 ntohl(get_unaligned((u32 *)&sense[3]));
966 idetape_update_buffers(pc);
970 * If error was the result of a zero-length read or write command,
971 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
972 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
974 if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD)
976 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
977 if (tape->sense_key == 5) {
978 /* don't report an error, everything's ok */
980 /* don't retry read/write */
981 set_bit(PC_ABORT, &pc->flags);
984 if (pc->c[0] == IDETAPE_READ_CMD && (sense[2] & 0x80)) {
985 pc->error = IDETAPE_ERROR_FILEMARK;
986 set_bit(PC_ABORT, &pc->flags);
988 if (pc->c[0] == IDETAPE_WRITE_CMD) {
989 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
990 && tape->asc == 0x0 && tape->ascq == 0x2)) {
991 pc->error = IDETAPE_ERROR_EOD;
992 set_bit(PC_ABORT, &pc->flags);
995 if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) {
996 if (tape->sense_key == 8) {
997 pc->error = IDETAPE_ERROR_EOD;
998 set_bit(PC_ABORT, &pc->flags);
1000 if (!test_bit(PC_ABORT, &pc->flags) &&
1001 pc->actually_transferred)
1002 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
1007 * idetape_active_next_stage will declare the next stage as "active".
1009 static void idetape_active_next_stage (ide_drive_t *drive)
1011 idetape_tape_t *tape = drive->driver_data;
1012 idetape_stage_t *stage = tape->next_stage;
1013 struct request *rq = &stage->rq;
1015 #if IDETAPE_DEBUG_LOG
1016 if (tape->debug_level >= 4)
1017 printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n");
1018 #endif /* IDETAPE_DEBUG_LOG */
1019 if (stage == NULL) {
1020 printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n");
1024 rq->rq_disk = tape->disk;
1026 rq->special = (void *)stage->bh;
1027 tape->active_data_request = rq;
1028 tape->active_stage = stage;
1029 tape->next_stage = stage->next;
1033 * idetape_increase_max_pipeline_stages is a part of the feedback
1034 * loop which tries to find the optimum number of stages. In the
1035 * feedback loop, we are starting from a minimum maximum number of
1036 * stages, and if we sense that the pipeline is empty, we try to
1037 * increase it, until we reach the user compile time memory limit.
1039 static void idetape_increase_max_pipeline_stages (ide_drive_t *drive)
1041 idetape_tape_t *tape = drive->driver_data;
1042 int increase = (tape->max_pipeline - tape->min_pipeline) / 10;
1044 #if IDETAPE_DEBUG_LOG
1045 if (tape->debug_level >= 4)
1046 printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n");
1047 #endif /* IDETAPE_DEBUG_LOG */
1049 tape->max_stages += max(increase, 1);
1050 tape->max_stages = max(tape->max_stages, tape->min_pipeline);
1051 tape->max_stages = min(tape->max_stages, tape->max_pipeline);
1055 * idetape_kfree_stage calls kfree to completely free a stage, along with
1056 * its related buffers.
1058 static void __idetape_kfree_stage (idetape_stage_t *stage)
1060 struct idetape_bh *prev_bh, *bh = stage->bh;
1063 while (bh != NULL) {
1064 if (bh->b_data != NULL) {
1065 size = (int) bh->b_size;
1067 free_page((unsigned long) bh->b_data);
1069 bh->b_data += PAGE_SIZE;
1079 static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage)
1081 __idetape_kfree_stage(stage);
1085 * idetape_remove_stage_head removes tape->first_stage from the pipeline.
1086 * The caller should avoid race conditions.
1088 static void idetape_remove_stage_head (ide_drive_t *drive)
1090 idetape_tape_t *tape = drive->driver_data;
1091 idetape_stage_t *stage;
1093 #if IDETAPE_DEBUG_LOG
1094 if (tape->debug_level >= 4)
1095 printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n");
1096 #endif /* IDETAPE_DEBUG_LOG */
1097 if (tape->first_stage == NULL) {
1098 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
1101 if (tape->active_stage == tape->first_stage) {
1102 printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n");
1105 stage = tape->first_stage;
1106 tape->first_stage = stage->next;
1107 idetape_kfree_stage(tape, stage);
1109 if (tape->first_stage == NULL) {
1110 tape->last_stage = NULL;
1111 if (tape->next_stage != NULL)
1112 printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n");
1113 if (tape->nr_stages)
1114 printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n");
1119 * This will free all the pipeline stages starting from new_last_stage->next
1120 * to the end of the list, and point tape->last_stage to new_last_stage.
1122 static void idetape_abort_pipeline(ide_drive_t *drive,
1123 idetape_stage_t *new_last_stage)
1125 idetape_tape_t *tape = drive->driver_data;
1126 idetape_stage_t *stage = new_last_stage->next;
1127 idetape_stage_t *nstage;
1129 #if IDETAPE_DEBUG_LOG
1130 if (tape->debug_level >= 4)
1131 printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name);
1134 nstage = stage->next;
1135 idetape_kfree_stage(tape, stage);
1137 --tape->nr_pending_stages;
1141 new_last_stage->next = NULL;
1142 tape->last_stage = new_last_stage;
1143 tape->next_stage = NULL;
1147 * idetape_end_request is used to finish servicing a request, and to
1148 * insert a pending pipeline request into the main device queue.
1150 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
1152 struct request *rq = HWGROUP(drive)->rq;
1153 idetape_tape_t *tape = drive->driver_data;
1154 unsigned long flags;
1156 int remove_stage = 0;
1157 idetape_stage_t *active_stage;
1159 #if IDETAPE_DEBUG_LOG
1160 if (tape->debug_level >= 4)
1161 printk(KERN_INFO "ide-tape: Reached idetape_end_request\n");
1162 #endif /* IDETAPE_DEBUG_LOG */
1165 case 0: error = IDETAPE_ERROR_GENERAL; break;
1166 case 1: error = 0; break;
1167 default: error = uptodate;
1171 tape->failed_pc = NULL;
1173 if (!blk_special_request(rq)) {
1174 ide_end_request(drive, uptodate, nr_sects);
1178 spin_lock_irqsave(&tape->spinlock, flags);
1180 /* The request was a pipelined data transfer request */
1181 if (tape->active_data_request == rq) {
1182 active_stage = tape->active_stage;
1183 tape->active_stage = NULL;
1184 tape->active_data_request = NULL;
1185 tape->nr_pending_stages--;
1186 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
1189 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
1190 if (error == IDETAPE_ERROR_EOD)
1191 idetape_abort_pipeline(drive, active_stage);
1193 } else if (rq->cmd[0] & REQ_IDETAPE_READ) {
1194 if (error == IDETAPE_ERROR_EOD) {
1195 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
1196 idetape_abort_pipeline(drive, active_stage);
1199 if (tape->next_stage != NULL) {
1200 idetape_active_next_stage(drive);
1203 * Insert the next request into the request queue.
1205 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
1206 } else if (!error) {
1207 idetape_increase_max_pipeline_stages(drive);
1210 ide_end_drive_cmd(drive, 0, 0);
1211 // blkdev_dequeue_request(rq);
1212 // drive->rq = NULL;
1213 // end_that_request_last(rq);
1216 idetape_remove_stage_head(drive);
1217 if (tape->active_data_request == NULL)
1218 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
1219 spin_unlock_irqrestore(&tape->spinlock, flags);
1223 static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive)
1225 idetape_tape_t *tape = drive->driver_data;
1227 #if IDETAPE_DEBUG_LOG
1228 if (tape->debug_level >= 4)
1229 printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n");
1230 #endif /* IDETAPE_DEBUG_LOG */
1231 if (!tape->pc->error) {
1232 idetape_analyze_error(drive, tape->pc->buffer);
1233 idetape_end_request(drive, 1, 0);
1235 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
1236 idetape_end_request(drive, 0, 0);
1241 static void idetape_create_request_sense_cmd (idetape_pc_t *pc)
1243 idetape_init_pc(pc);
1244 pc->c[0] = IDETAPE_REQUEST_SENSE_CMD;
1246 pc->request_transfer = 20;
1247 pc->callback = &idetape_request_sense_callback;
1250 static void idetape_init_rq(struct request *rq, u8 cmd)
1252 memset(rq, 0, sizeof(*rq));
1253 rq->cmd_type = REQ_TYPE_SPECIAL;
1258 * idetape_queue_pc_head generates a new packet command request in front
1259 * of the request queue, before the current request, so that it will be
1260 * processed immediately, on the next pass through the driver.
1262 * idetape_queue_pc_head is called from the request handling part of
1263 * the driver (the "bottom" part). Safe storage for the request should
1264 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
1265 * before calling idetape_queue_pc_head.
1267 * Memory for those requests is pre-allocated at initialization time, and
1268 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
1269 * space for the maximum possible number of inter-dependent packet commands.
1271 * The higher level of the driver - The ioctl handler and the character
1272 * device handling functions should queue request to the lower level part
1273 * and wait for their completion using idetape_queue_pc_tail or
1274 * idetape_queue_rw_tail.
1276 static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq)
1278 struct ide_tape_obj *tape = drive->driver_data;
1280 idetape_init_rq(rq, REQ_IDETAPE_PC1);
1281 rq->buffer = (char *) pc;
1282 rq->rq_disk = tape->disk;
1283 (void) ide_do_drive_cmd(drive, rq, ide_preempt);
1287 * idetape_retry_pc is called when an error was detected during the
1288 * last packet command. We queue a request sense packet command in
1289 * the head of the request list.
1291 static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
1293 idetape_tape_t *tape = drive->driver_data;
1297 (void)drive->hwif->INB(IDE_ERROR_REG);
1298 pc = idetape_next_pc_storage(drive);
1299 rq = idetape_next_rq_storage(drive);
1300 idetape_create_request_sense_cmd(pc);
1301 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1302 idetape_queue_pc_head(drive, pc, rq);
1307 * idetape_postpone_request postpones the current request so that
1308 * ide.c will be able to service requests from another device on
1309 * the same hwgroup while we are polling for DSC.
1311 static void idetape_postpone_request (ide_drive_t *drive)
1313 idetape_tape_t *tape = drive->driver_data;
1315 #if IDETAPE_DEBUG_LOG
1316 if (tape->debug_level >= 4)
1317 printk(KERN_INFO "ide-tape: idetape_postpone_request\n");
1319 tape->postponed_rq = HWGROUP(drive)->rq;
1320 ide_stall_queue(drive, tape->dsc_polling_frequency);
1324 * idetape_pc_intr is the usual interrupt handler which will be called
1325 * during a packet command. We will transfer some of the data (as
1326 * requested by the drive) and will re-point interrupt handler to us.
1327 * When data transfer is finished, we will act according to the
1328 * algorithm described before idetape_issue_packet_command.
1331 static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
1333 ide_hwif_t *hwif = drive->hwif;
1334 idetape_tape_t *tape = drive->driver_data;
1335 idetape_pc_t *pc = tape->pc;
1338 static int error_sim_count = 0;
1343 #if IDETAPE_DEBUG_LOG
1344 if (tape->debug_level >= 4)
1345 printk(KERN_INFO "ide-tape: Reached idetape_pc_intr "
1346 "interrupt handler\n");
1347 #endif /* IDETAPE_DEBUG_LOG */
1349 /* Clear the interrupt */
1350 stat = hwif->INB(IDE_STATUS_REG);
1352 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1353 if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) {
1355 * A DMA error is sometimes expected. For example,
1356 * if the tape is crossing a filemark during a
1357 * READ command, it will issue an irq and position
1358 * itself before the filemark, so that only a partial
1359 * data transfer will occur (which causes the DMA
1360 * error). In that case, we will later ask the tape
1361 * how much bytes of the original request were
1362 * actually transferred (we can't receive that
1363 * information from the DMA engine on most chipsets).
1367 * On the contrary, a DMA error is never expected;
1368 * it usually indicates a hardware error or abort.
1369 * If the tape crosses a filemark during a READ
1370 * command, it will issue an irq and position itself
1371 * after the filemark (not before). Only a partial
1372 * data transfer will occur, but no DMA error.
1375 set_bit(PC_DMA_ERROR, &pc->flags);
1377 pc->actually_transferred = pc->request_transfer;
1378 idetape_update_buffers(pc);
1380 #if IDETAPE_DEBUG_LOG
1381 if (tape->debug_level >= 4)
1382 printk(KERN_INFO "ide-tape: DMA finished\n");
1383 #endif /* IDETAPE_DEBUG_LOG */
1386 /* No more interrupts */
1387 if ((stat & DRQ_STAT) == 0) {
1388 #if IDETAPE_DEBUG_LOG
1389 if (tape->debug_level >= 2)
1390 printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred);
1391 #endif /* IDETAPE_DEBUG_LOG */
1392 clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
1397 if ((pc->c[0] == IDETAPE_WRITE_CMD ||
1398 pc->c[0] == IDETAPE_READ_CMD) &&
1399 (++error_sim_count % 100) == 0) {
1400 printk(KERN_INFO "ide-tape: %s: simulating error\n",
1405 if ((stat & ERR_STAT) && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD)
1407 if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) {
1408 /* Error detected */
1409 #if IDETAPE_DEBUG_LOG
1410 if (tape->debug_level >= 1)
1411 printk(KERN_INFO "ide-tape: %s: I/O error\n",
1413 #endif /* IDETAPE_DEBUG_LOG */
1414 if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
1415 printk(KERN_ERR "ide-tape: I/O error in request sense command\n");
1416 return ide_do_reset(drive);
1418 #if IDETAPE_DEBUG_LOG
1419 if (tape->debug_level >= 1)
1420 printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]);
1422 /* Retry operation */
1423 return idetape_retry_pc(drive);
1426 if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) &&
1427 (stat & SEEK_STAT) == 0) {
1428 /* Media access command */
1429 tape->dsc_polling_start = jiffies;
1430 tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST;
1431 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
1432 /* Allow ide.c to handle other requests */
1433 idetape_postpone_request(drive);
1436 if (tape->failed_pc == pc)
1437 tape->failed_pc = NULL;
1438 /* Command finished - Call the callback function */
1439 return pc->callback(drive);
1441 if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1442 printk(KERN_ERR "ide-tape: The tape wants to issue more "
1443 "interrupts in DMA mode\n");
1444 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
1446 return ide_do_reset(drive);
1448 /* Get the number of bytes to transfer on this interrupt. */
1449 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) |
1450 hwif->INB(IDE_BCOUNTL_REG);
1452 ireason = hwif->INB(IDE_IREASON_REG);
1455 printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n");
1456 return ide_do_reset(drive);
1458 if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) {
1459 /* Hopefully, we will never get here */
1460 printk(KERN_ERR "ide-tape: We wanted to %s, ",
1461 (ireason & IO) ? "Write" : "Read");
1462 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
1463 (ireason & IO) ? "Read" : "Write");
1464 return ide_do_reset(drive);
1466 if (!test_bit(PC_WRITING, &pc->flags)) {
1467 /* Reading - Check that we have enough space */
1468 temp = pc->actually_transferred + bcount;
1469 if (temp > pc->request_transfer) {
1470 if (temp > pc->buffer_size) {
1471 printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n");
1472 idetape_discard_data(drive, bcount);
1473 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1476 #if IDETAPE_DEBUG_LOG
1477 if (tape->debug_level >= 2)
1478 printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
1479 #endif /* IDETAPE_DEBUG_LOG */
1482 if (test_bit(PC_WRITING, &pc->flags)) {
1484 idetape_output_buffers(drive, pc, bcount);
1486 /* Write the current buffer */
1487 hwif->atapi_output_bytes(drive, pc->current_position,
1491 idetape_input_buffers(drive, pc, bcount);
1493 /* Read the current buffer */
1494 hwif->atapi_input_bytes(drive, pc->current_position,
1497 /* Update the current position */
1498 pc->actually_transferred += bcount;
1499 pc->current_position += bcount;
1500 #if IDETAPE_DEBUG_LOG
1501 if (tape->debug_level >= 2)
1502 printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes "
1503 "on that interrupt\n", pc->c[0], bcount);
1505 /* And set the interrupt handler again */
1506 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1511 * Packet Command Interface
1513 * The current Packet Command is available in tape->pc, and will not
1514 * change until we finish handling it. Each packet command is associated
1515 * with a callback function that will be called when the command is
1518 * The handling will be done in three stages:
1520 * 1. idetape_issue_packet_command will send the packet command to the
1521 * drive, and will set the interrupt handler to idetape_pc_intr.
1523 * 2. On each interrupt, idetape_pc_intr will be called. This step
1524 * will be repeated until the device signals us that no more
1525 * interrupts will be issued.
1527 * 3. ATAPI Tape media access commands have immediate status with a
1528 * delayed process. In case of a successful initiation of a
1529 * media access packet command, the DSC bit will be set when the
1530 * actual execution of the command is finished.
1531 * Since the tape drive will not issue an interrupt, we have to
1532 * poll for this event. In this case, we define the request as
1533 * "low priority request" by setting rq_status to
1534 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
1537 * ide.c will then give higher priority to requests which
1538 * originate from the other device, until will change rq_status
1541 * 4. When the packet command is finished, it will be checked for errors.
1543 * 5. In case an error was found, we queue a request sense packet
1544 * command in front of the request queue and retry the operation
1545 * up to IDETAPE_MAX_PC_RETRIES times.
1547 * 6. In case no error was found, or we decided to give up and not
1548 * to retry again, the callback function will be called and then
1549 * we will handle the next request.
1552 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
1554 ide_hwif_t *hwif = drive->hwif;
1555 idetape_tape_t *tape = drive->driver_data;
1556 idetape_pc_t *pc = tape->pc;
1558 ide_startstop_t startstop;
1561 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
1562 printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
1565 ireason = hwif->INB(IDE_IREASON_REG);
1566 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
1567 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
1568 "a packet command, retrying\n");
1570 ireason = hwif->INB(IDE_IREASON_REG);
1572 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
1573 "issuing a packet command, ignoring\n");
1578 if ((ireason & CD) == 0 || (ireason & IO)) {
1579 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
1580 "a packet command\n");
1581 return ide_do_reset(drive);
1583 /* Set the interrupt routine */
1584 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1585 #ifdef CONFIG_BLK_DEV_IDEDMA
1586 /* Begin DMA, if necessary */
1587 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags))
1588 hwif->dma_start(drive);
1590 /* Send the actual packet */
1591 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
1595 static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc)
1597 ide_hwif_t *hwif = drive->hwif;
1598 idetape_tape_t *tape = drive->driver_data;
1602 if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD &&
1603 pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
1604 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
1605 "Two request sense in serial were issued\n");
1608 if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD)
1609 tape->failed_pc = pc;
1610 /* Set the current packet command */
1613 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
1614 test_bit(PC_ABORT, &pc->flags)) {
1616 * We will "abort" retrying a packet command in case
1617 * a legitimate error code was received (crossing a
1618 * filemark, or end of the media, for example).
1620 if (!test_bit(PC_ABORT, &pc->flags)) {
1621 if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD &&
1622 tape->sense_key == 2 && tape->asc == 4 &&
1623 (tape->ascq == 1 || tape->ascq == 8))) {
1624 printk(KERN_ERR "ide-tape: %s: I/O error, "
1625 "pc = %2x, key = %2x, "
1626 "asc = %2x, ascq = %2x\n",
1627 tape->name, pc->c[0],
1628 tape->sense_key, tape->asc,
1632 pc->error = IDETAPE_ERROR_GENERAL;
1634 tape->failed_pc = NULL;
1635 return pc->callback(drive);
1637 #if IDETAPE_DEBUG_LOG
1638 if (tape->debug_level >= 2)
1639 printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]);
1640 #endif /* IDETAPE_DEBUG_LOG */
1643 /* We haven't transferred any data yet */
1644 pc->actually_transferred = 0;
1645 pc->current_position = pc->buffer;
1646 /* Request to transfer the entire buffer at once */
1647 bcount = pc->request_transfer;
1649 if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) {
1650 printk(KERN_WARNING "ide-tape: DMA disabled, "
1651 "reverting to PIO\n");
1654 if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
1655 dma_ok = !hwif->dma_setup(drive);
1657 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
1658 IDE_TFLAG_OUT_DEVICE, bcount, dma_ok);
1660 if (dma_ok) /* Will begin DMA later */
1661 set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
1662 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) {
1663 ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc,
1664 IDETAPE_WAIT_CMD, NULL);
1667 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
1668 return idetape_transfer_pc(drive);
1673 * General packet command callback function.
1675 static ide_startstop_t idetape_pc_callback (ide_drive_t *drive)
1677 idetape_tape_t *tape = drive->driver_data;
1679 #if IDETAPE_DEBUG_LOG
1680 if (tape->debug_level >= 4)
1681 printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n");
1682 #endif /* IDETAPE_DEBUG_LOG */
1684 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
1689 * A mode sense command is used to "sense" tape parameters.
1691 static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
1693 idetape_init_pc(pc);
1694 pc->c[0] = IDETAPE_MODE_SENSE_CMD;
1695 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
1696 pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */
1697 pc->c[2] = page_code;
1699 * Changed pc->c[3] to 0 (255 will at best return unused info).
1701 * For SCSI this byte is defined as subpage instead of high byte
1702 * of length and some IDE drives seem to interpret it this way
1703 * and return an error when 255 is used.
1706 pc->c[4] = 255; /* (We will just discard data in that case) */
1707 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
1708 pc->request_transfer = 12;
1709 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
1710 pc->request_transfer = 24;
1712 pc->request_transfer = 50;
1713 pc->callback = &idetape_pc_callback;
1716 static void calculate_speeds(ide_drive_t *drive)
1718 idetape_tape_t *tape = drive->driver_data;
1719 int full = 125, empty = 75;
1721 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
1722 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
1723 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time;
1724 tape->controlled_last_pipeline_head = tape->pipeline_head;
1725 tape->controlled_pipeline_head_time = jiffies;
1727 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
1728 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time);
1729 else if (time_after(jiffies, tape->controlled_previous_head_time))
1730 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time);
1732 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) {
1733 /* -1 for read mode error recovery */
1734 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) {
1735 tape->uncontrolled_pipeline_head_time = jiffies;
1736 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time);
1739 tape->uncontrolled_previous_head_time = jiffies;
1740 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
1741 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) {
1742 tape->uncontrolled_pipeline_head_time = jiffies;
1745 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
1746 if (tape->speed_control == 0) {
1747 tape->max_insert_speed = 5000;
1748 } else if (tape->speed_control == 1) {
1749 if (tape->nr_pending_stages >= tape->max_stages / 2)
1750 tape->max_insert_speed = tape->pipeline_head_speed +
1751 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
1753 tape->max_insert_speed = 500 +
1754 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
1755 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
1756 tape->max_insert_speed = 5000;
1757 } else if (tape->speed_control == 2) {
1758 tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 +
1759 (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages;
1761 tape->max_insert_speed = tape->speed_control;
1762 tape->max_insert_speed = max(tape->max_insert_speed, 500);
1765 static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
1767 idetape_tape_t *tape = drive->driver_data;
1768 idetape_pc_t *pc = tape->pc;
1771 stat = drive->hwif->INB(IDE_STATUS_REG);
1772 if (stat & SEEK_STAT) {
1773 if (stat & ERR_STAT) {
1774 /* Error detected */
1775 if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD)
1776 printk(KERN_ERR "ide-tape: %s: I/O error, ",
1778 /* Retry operation */
1779 return idetape_retry_pc(drive);
1782 if (tape->failed_pc == pc)
1783 tape->failed_pc = NULL;
1785 pc->error = IDETAPE_ERROR_GENERAL;
1786 tape->failed_pc = NULL;
1788 return pc->callback(drive);
1791 static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
1793 idetape_tape_t *tape = drive->driver_data;
1794 struct request *rq = HWGROUP(drive)->rq;
1795 int blocks = tape->pc->actually_transferred / tape->tape_block_size;
1797 tape->avg_size += blocks * tape->tape_block_size;
1798 tape->insert_size += blocks * tape->tape_block_size;
1799 if (tape->insert_size > 1024 * 1024)
1800 tape->measure_insert_time = 1;
1801 if (tape->measure_insert_time) {
1802 tape->measure_insert_time = 0;
1803 tape->insert_time = jiffies;
1804 tape->insert_size = 0;
1806 if (time_after(jiffies, tape->insert_time))
1807 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
1808 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
1809 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024;
1811 tape->avg_time = jiffies;
1814 #if IDETAPE_DEBUG_LOG
1815 if (tape->debug_level >= 4)
1816 printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n");
1817 #endif /* IDETAPE_DEBUG_LOG */
1819 tape->first_frame_position += blocks;
1820 rq->current_nr_sectors -= blocks;
1822 if (!tape->pc->error)
1823 idetape_end_request(drive, 1, 0);
1825 idetape_end_request(drive, tape->pc->error, 0);
1829 static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
1831 idetape_init_pc(pc);
1832 pc->c[0] = IDETAPE_READ_CMD;
1833 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]);
1835 pc->callback = &idetape_rw_callback;
1837 atomic_set(&bh->b_count, 0);
1839 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
1840 if (pc->request_transfer == tape->stage_size)
1841 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
1844 static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
1847 struct idetape_bh *p = bh;
1849 idetape_init_pc(pc);
1850 pc->c[0] = IDETAPE_READ_BUFFER_CMD;
1851 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK;
1852 pc->c[7] = size >> 8;
1853 pc->c[8] = size & 0xff;
1854 pc->callback = &idetape_pc_callback;
1856 atomic_set(&bh->b_count, 0);
1859 atomic_set(&p->b_count, 0);
1862 pc->request_transfer = pc->buffer_size = size;
1865 static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
1867 idetape_init_pc(pc);
1868 pc->c[0] = IDETAPE_WRITE_CMD;
1869 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]);
1871 pc->callback = &idetape_rw_callback;
1872 set_bit(PC_WRITING, &pc->flags);
1874 pc->b_data = bh->b_data;
1875 pc->b_count = atomic_read(&bh->b_count);
1877 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
1878 if (pc->request_transfer == tape->stage_size)
1879 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
1883 * idetape_do_request is our request handling function.
1885 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
1886 struct request *rq, sector_t block)
1888 idetape_tape_t *tape = drive->driver_data;
1889 idetape_pc_t *pc = NULL;
1890 struct request *postponed_rq = tape->postponed_rq;
1893 #if IDETAPE_DEBUG_LOG
1894 if (tape->debug_level >= 2)
1895 printk(KERN_INFO "ide-tape: sector: %ld, "
1896 "nr_sectors: %ld, current_nr_sectors: %d\n",
1897 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
1898 #endif /* IDETAPE_DEBUG_LOG */
1900 if (!blk_special_request(rq)) {
1902 * We do not support buffer cache originated requests.
1904 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
1905 "request queue (%d)\n", drive->name, rq->cmd_type);
1906 ide_end_request(drive, 0, 0);
1911 * Retry a failed packet command
1913 if (tape->failed_pc != NULL &&
1914 tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
1915 return idetape_issue_packet_command(drive, tape->failed_pc);
1917 if (postponed_rq != NULL)
1918 if (rq != postponed_rq) {
1919 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
1920 "Two DSC requests were queued\n");
1921 idetape_end_request(drive, 0, 0);
1925 tape->postponed_rq = NULL;
1928 * If the tape is still busy, postpone our request and service
1929 * the other device meanwhile.
1931 stat = drive->hwif->INB(IDE_STATUS_REG);
1933 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
1934 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1936 if (drive->post_reset == 1) {
1937 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1938 drive->post_reset = 0;
1941 if (tape->tape_still_time > 100 && tape->tape_still_time < 200)
1942 tape->measure_insert_time = 1;
1943 if (time_after(jiffies, tape->insert_time))
1944 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
1945 calculate_speeds(drive);
1946 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
1947 (stat & SEEK_STAT) == 0) {
1948 if (postponed_rq == NULL) {
1949 tape->dsc_polling_start = jiffies;
1950 tape->dsc_polling_frequency = tape->best_dsc_rw_frequency;
1951 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
1952 } else if (time_after(jiffies, tape->dsc_timeout)) {
1953 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
1955 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1956 idetape_media_access_finished(drive);
1959 return ide_do_reset(drive);
1961 } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD))
1962 tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW;
1963 idetape_postpone_request(drive);
1966 if (rq->cmd[0] & REQ_IDETAPE_READ) {
1967 tape->buffer_head++;
1968 tape->postpone_cnt = 0;
1969 pc = idetape_next_pc_storage(drive);
1970 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
1973 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
1974 tape->buffer_head++;
1975 tape->postpone_cnt = 0;
1976 pc = idetape_next_pc_storage(drive);
1977 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
1980 if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) {
1981 tape->postpone_cnt = 0;
1982 pc = idetape_next_pc_storage(drive);
1983 idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
1986 if (rq->cmd[0] & REQ_IDETAPE_PC1) {
1987 pc = (idetape_pc_t *) rq->buffer;
1988 rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
1989 rq->cmd[0] |= REQ_IDETAPE_PC2;
1992 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1993 idetape_media_access_finished(drive);
1998 return idetape_issue_packet_command(drive, pc);
2002 * Pipeline related functions
2004 static inline int idetape_pipeline_active (idetape_tape_t *tape)
2008 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
2009 rc2 = (tape->active_data_request != NULL);
2014 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
2015 * stage, along with all the necessary small buffers which together make
2016 * a buffer of size tape->stage_size (or a bit more). We attempt to
2017 * combine sequential pages as much as possible.
2019 * Returns a pointer to the new allocated stage, or NULL if we
2020 * can't (or don't want to) allocate a stage.
2022 * Pipeline stages are optional and are used to increase performance.
2023 * If we can't allocate them, we'll manage without them.
2025 static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear)
2027 idetape_stage_t *stage;
2028 struct idetape_bh *prev_bh, *bh;
2029 int pages = tape->pages_per_stage;
2030 char *b_data = NULL;
2032 if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
2036 bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
2039 bh->b_reqnext = NULL;
2040 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
2043 memset(bh->b_data, 0, PAGE_SIZE);
2044 bh->b_size = PAGE_SIZE;
2045 atomic_set(&bh->b_count, full ? bh->b_size : 0);
2048 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
2051 memset(b_data, 0, PAGE_SIZE);
2052 if (bh->b_data == b_data + PAGE_SIZE) {
2053 bh->b_size += PAGE_SIZE;
2054 bh->b_data -= PAGE_SIZE;
2056 atomic_add(PAGE_SIZE, &bh->b_count);
2059 if (b_data == bh->b_data + bh->b_size) {
2060 bh->b_size += PAGE_SIZE;
2062 atomic_add(PAGE_SIZE, &bh->b_count);
2066 if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) {
2067 free_page((unsigned long) b_data);
2070 bh->b_reqnext = NULL;
2071 bh->b_data = b_data;
2072 bh->b_size = PAGE_SIZE;
2073 atomic_set(&bh->b_count, full ? bh->b_size : 0);
2074 prev_bh->b_reqnext = bh;
2076 bh->b_size -= tape->excess_bh_size;
2078 atomic_sub(tape->excess_bh_size, &bh->b_count);
2081 __idetape_kfree_stage(stage);
2085 static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
2087 idetape_stage_t *cache_stage = tape->cache_stage;
2089 #if IDETAPE_DEBUG_LOG
2090 if (tape->debug_level >= 4)
2091 printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n");
2092 #endif /* IDETAPE_DEBUG_LOG */
2094 if (tape->nr_stages >= tape->max_stages)
2096 if (cache_stage != NULL) {
2097 tape->cache_stage = NULL;
2100 return __idetape_kmalloc_stage(tape, 0, 0);
2103 static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n)
2105 struct idetape_bh *bh = tape->bh;
2111 printk(KERN_ERR "ide-tape: bh == NULL in "
2112 "idetape_copy_stage_from_user\n");
2115 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
2116 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count))
2119 atomic_add(count, &bh->b_count);
2121 if (atomic_read(&bh->b_count) == bh->b_size) {
2124 atomic_set(&bh->b_count, 0);
2131 static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n)
2133 struct idetape_bh *bh = tape->bh;
2139 printk(KERN_ERR "ide-tape: bh == NULL in "
2140 "idetape_copy_stage_to_user\n");
2143 count = min(tape->b_count, n);
2144 if (copy_to_user(buf, tape->b_data, count))
2147 tape->b_data += count;
2148 tape->b_count -= count;
2150 if (!tape->b_count) {
2151 tape->bh = bh = bh->b_reqnext;
2153 tape->b_data = bh->b_data;
2154 tape->b_count = atomic_read(&bh->b_count);
2161 static void idetape_init_merge_stage (idetape_tape_t *tape)
2163 struct idetape_bh *bh = tape->merge_stage->bh;
2166 if (tape->chrdev_direction == idetape_direction_write)
2167 atomic_set(&bh->b_count, 0);
2169 tape->b_data = bh->b_data;
2170 tape->b_count = atomic_read(&bh->b_count);
2174 static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
2176 struct idetape_bh *tmp;
2179 stage->bh = tape->merge_stage->bh;
2180 tape->merge_stage->bh = tmp;
2181 idetape_init_merge_stage(tape);
2185 * idetape_add_stage_tail adds a new stage at the end of the pipeline.
2187 static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
2189 idetape_tape_t *tape = drive->driver_data;
2190 unsigned long flags;
2192 #if IDETAPE_DEBUG_LOG
2193 if (tape->debug_level >= 4)
2194 printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n");
2195 #endif /* IDETAPE_DEBUG_LOG */
2196 spin_lock_irqsave(&tape->spinlock, flags);
2198 if (tape->last_stage != NULL)
2199 tape->last_stage->next=stage;
2201 tape->first_stage = tape->next_stage=stage;
2202 tape->last_stage = stage;
2203 if (tape->next_stage == NULL)
2204 tape->next_stage = tape->last_stage;
2206 tape->nr_pending_stages++;
2207 spin_unlock_irqrestore(&tape->spinlock, flags);
2211 * idetape_wait_for_request installs a completion in a pending request
2212 * and sleeps until it is serviced.
2214 * The caller should ensure that the request will not be serviced
2215 * before we install the completion (usually by disabling interrupts).
2217 static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
2219 DECLARE_COMPLETION_ONSTACK(wait);
2220 idetape_tape_t *tape = drive->driver_data;
2222 if (rq == NULL || !blk_special_request(rq)) {
2223 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
2226 rq->end_io_data = &wait;
2227 rq->end_io = blk_end_sync_rq;
2228 spin_unlock_irq(&tape->spinlock);
2229 wait_for_completion(&wait);
2230 /* The stage and its struct request have been deallocated */
2231 spin_lock_irq(&tape->spinlock);
2234 static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive)
2236 idetape_tape_t *tape = drive->driver_data;
2237 idetape_read_position_result_t *result;
2239 #if IDETAPE_DEBUG_LOG
2240 if (tape->debug_level >= 4)
2241 printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n");
2242 #endif /* IDETAPE_DEBUG_LOG */
2244 if (!tape->pc->error) {
2245 result = (idetape_read_position_result_t *) tape->pc->buffer;
2246 #if IDETAPE_DEBUG_LOG
2247 if (tape->debug_level >= 2)
2248 printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No");
2249 if (tape->debug_level >= 2)
2250 printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No");
2251 #endif /* IDETAPE_DEBUG_LOG */
2253 printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n");
2254 clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
2255 idetape_end_request(drive, 0, 0);
2257 #if IDETAPE_DEBUG_LOG
2258 if (tape->debug_level >= 2)
2259 printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block));
2260 #endif /* IDETAPE_DEBUG_LOG */
2261 tape->partition = result->partition;
2262 tape->first_frame_position = ntohl(result->first_block);
2263 tape->last_frame_position = ntohl(result->last_block);
2264 tape->blocks_in_buffer = result->blocks_in_buffer[2];
2265 set_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
2266 idetape_end_request(drive, 1, 0);
2269 idetape_end_request(drive, 0, 0);
2275 * idetape_create_write_filemark_cmd will:
2277 * 1. Write a filemark if write_filemark=1.
2278 * 2. Flush the device buffers without writing a filemark
2279 * if write_filemark=0.
2282 static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark)
2284 idetape_init_pc(pc);
2285 pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD;
2286 pc->c[4] = write_filemark;
2287 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2288 pc->callback = &idetape_pc_callback;
2291 static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc)
2293 idetape_init_pc(pc);
2294 pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD;
2295 pc->callback = &idetape_pc_callback;
2299 * idetape_queue_pc_tail is based on the following functions:
2301 * ide_do_drive_cmd from ide.c
2302 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
2304 * We add a special packet command request to the tail of the request
2305 * queue, and wait for it to be serviced.
2307 * This is not to be called from within the request handling part
2308 * of the driver ! We allocate here data in the stack, and it is valid
2309 * until the request is finished. This is not the case for the bottom
2310 * part of the driver, where we are always leaving the functions to wait
2311 * for an interrupt or a timer event.
2313 * From the bottom part of the driver, we should allocate safe memory
2314 * using idetape_next_pc_storage and idetape_next_rq_storage, and add
2315 * the request to the request list without waiting for it to be serviced !
2316 * In that case, we usually use idetape_queue_pc_head.
2318 static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc)
2320 struct ide_tape_obj *tape = drive->driver_data;
2323 idetape_init_rq(&rq, REQ_IDETAPE_PC1);
2324 rq.buffer = (char *) pc;
2325 rq.rq_disk = tape->disk;
2326 return ide_do_drive_cmd(drive, &rq, ide_wait);
2329 static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd)
2331 idetape_init_pc(pc);
2332 pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD;
2334 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2335 pc->callback = &idetape_pc_callback;
2338 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
2340 idetape_tape_t *tape = drive->driver_data;
2342 int load_attempted = 0;
2345 * Wait for the tape to become ready
2347 set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
2349 while (time_before(jiffies, timeout)) {
2350 idetape_create_test_unit_ready_cmd(&pc);
2351 if (!__idetape_queue_pc_tail(drive, &pc))
2353 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
2354 || (tape->asc == 0x3A)) { /* no media */
2357 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
2358 __idetape_queue_pc_tail(drive, &pc);
2360 /* not about to be ready */
2361 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
2362 (tape->ascq == 1 || tape->ascq == 8)))
2369 static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
2371 return __idetape_queue_pc_tail(drive, pc);
2374 static int idetape_flush_tape_buffers (ide_drive_t *drive)
2379 idetape_create_write_filemark_cmd(drive, &pc, 0);
2380 if ((rc = idetape_queue_pc_tail(drive, &pc)))
2382 idetape_wait_ready(drive, 60 * 5 * HZ);
2386 static void idetape_create_read_position_cmd (idetape_pc_t *pc)
2388 idetape_init_pc(pc);
2389 pc->c[0] = IDETAPE_READ_POSITION_CMD;
2390 pc->request_transfer = 20;
2391 pc->callback = &idetape_read_position_callback;
2394 static int idetape_read_position (ide_drive_t *drive)
2396 idetape_tape_t *tape = drive->driver_data;
2400 #if IDETAPE_DEBUG_LOG
2401 if (tape->debug_level >= 4)
2402 printk(KERN_INFO "ide-tape: Reached idetape_read_position\n");
2403 #endif /* IDETAPE_DEBUG_LOG */
2405 idetape_create_read_position_cmd(&pc);
2406 if (idetape_queue_pc_tail(drive, &pc))
2408 position = tape->first_frame_position;
2412 static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip)
2414 idetape_init_pc(pc);
2415 pc->c[0] = IDETAPE_LOCATE_CMD;
2417 put_unaligned(htonl(block), (unsigned int *) &pc->c[3]);
2418 pc->c[8] = partition;
2419 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2420 pc->callback = &idetape_pc_callback;
2423 static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent)
2425 idetape_tape_t *tape = drive->driver_data;
2427 /* device supports locking according to capabilities page */
2428 if (!(tape->caps[6] & 0x01))
2431 idetape_init_pc(pc);
2432 pc->c[0] = IDETAPE_PREVENT_CMD;
2434 pc->callback = &idetape_pc_callback;
2438 static int __idetape_discard_read_pipeline (ide_drive_t *drive)
2440 idetape_tape_t *tape = drive->driver_data;
2441 unsigned long flags;
2444 if (tape->chrdev_direction != idetape_direction_read)
2447 /* Remove merge stage. */
2448 cnt = tape->merge_stage_size / tape->tape_block_size;
2449 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
2450 ++cnt; /* Filemarks count as 1 sector */
2451 tape->merge_stage_size = 0;
2452 if (tape->merge_stage != NULL) {
2453 __idetape_kfree_stage(tape->merge_stage);
2454 tape->merge_stage = NULL;
2457 /* Clear pipeline flags. */
2458 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
2459 tape->chrdev_direction = idetape_direction_none;
2461 /* Remove pipeline stages. */
2462 if (tape->first_stage == NULL)
2465 spin_lock_irqsave(&tape->spinlock, flags);
2466 tape->next_stage = NULL;
2467 if (idetape_pipeline_active(tape))
2468 idetape_wait_for_request(drive, tape->active_data_request);
2469 spin_unlock_irqrestore(&tape->spinlock, flags);
2471 while (tape->first_stage != NULL) {
2472 struct request *rq_ptr = &tape->first_stage->rq;
2474 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
2475 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
2477 idetape_remove_stage_head(drive);
2479 tape->nr_pending_stages = 0;
2480 tape->max_stages = tape->min_pipeline;
2485 * idetape_position_tape positions the tape to the requested block
2486 * using the LOCATE packet command. A READ POSITION command is then
2487 * issued to check where we are positioned.
2489 * Like all higher level operations, we queue the commands at the tail
2490 * of the request queue and wait for their completion.
2493 static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip)
2495 idetape_tape_t *tape = drive->driver_data;
2499 if (tape->chrdev_direction == idetape_direction_read)
2500 __idetape_discard_read_pipeline(drive);
2501 idetape_wait_ready(drive, 60 * 5 * HZ);
2502 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
2503 retval = idetape_queue_pc_tail(drive, &pc);
2507 idetape_create_read_position_cmd(&pc);
2508 return (idetape_queue_pc_tail(drive, &pc));
2511 static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position)
2513 idetape_tape_t *tape = drive->driver_data;
2517 cnt = __idetape_discard_read_pipeline(drive);
2518 if (restore_position) {
2519 position = idetape_read_position(drive);
2520 seek = position > cnt ? position - cnt : 0;
2521 if (idetape_position_tape(drive, seek, 0, 0)) {
2522 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name);
2529 * idetape_queue_rw_tail generates a read/write request for the block
2530 * device interface and wait for it to be serviced.
2532 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh)
2534 idetape_tape_t *tape = drive->driver_data;
2537 #if IDETAPE_DEBUG_LOG
2538 if (tape->debug_level >= 2)
2539 printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd);
2540 #endif /* IDETAPE_DEBUG_LOG */
2541 if (idetape_pipeline_active(tape)) {
2542 printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
2546 idetape_init_rq(&rq, cmd);
2547 rq.rq_disk = tape->disk;
2548 rq.special = (void *)bh;
2549 rq.sector = tape->first_frame_position;
2550 rq.nr_sectors = rq.current_nr_sectors = blocks;
2551 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
2553 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
2556 if (tape->merge_stage)
2557 idetape_init_merge_stage(tape);
2558 if (rq.errors == IDETAPE_ERROR_GENERAL)
2560 return (tape->tape_block_size * (blocks-rq.current_nr_sectors));
2564 * idetape_insert_pipeline_into_queue is used to start servicing the
2565 * pipeline stages, starting from tape->next_stage.
2567 static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
2569 idetape_tape_t *tape = drive->driver_data;
2571 if (tape->next_stage == NULL)
2573 if (!idetape_pipeline_active(tape)) {
2574 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
2575 idetape_active_next_stage(drive);
2576 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
2580 static void idetape_create_inquiry_cmd (idetape_pc_t *pc)
2582 idetape_init_pc(pc);
2583 pc->c[0] = IDETAPE_INQUIRY_CMD;
2584 pc->c[4] = pc->request_transfer = 254;
2585 pc->callback = &idetape_pc_callback;
2588 static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
2590 idetape_init_pc(pc);
2591 pc->c[0] = IDETAPE_REWIND_CMD;
2592 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2593 pc->callback = &idetape_pc_callback;
2596 static void idetape_create_erase_cmd (idetape_pc_t *pc)
2598 idetape_init_pc(pc);
2599 pc->c[0] = IDETAPE_ERASE_CMD;
2601 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2602 pc->callback = &idetape_pc_callback;
2605 static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd)
2607 idetape_init_pc(pc);
2608 pc->c[0] = IDETAPE_SPACE_CMD;
2609 put_unaligned(htonl(count), (unsigned int *) &pc->c[1]);
2611 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2612 pc->callback = &idetape_pc_callback;
2615 static void idetape_wait_first_stage (ide_drive_t *drive)
2617 idetape_tape_t *tape = drive->driver_data;
2618 unsigned long flags;
2620 if (tape->first_stage == NULL)
2622 spin_lock_irqsave(&tape->spinlock, flags);
2623 if (tape->active_stage == tape->first_stage)
2624 idetape_wait_for_request(drive, tape->active_data_request);
2625 spin_unlock_irqrestore(&tape->spinlock, flags);
2629 * idetape_add_chrdev_write_request tries to add a character device
2630 * originated write request to our pipeline. In case we don't succeed,
2631 * we revert to non-pipelined operation mode for this request.
2633 * 1. Try to allocate a new pipeline stage.
2634 * 2. If we can't, wait for more and more requests to be serviced
2635 * and try again each time.
2636 * 3. If we still can't allocate a stage, fallback to
2637 * non-pipelined operation mode for this request.
2639 static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
2641 idetape_tape_t *tape = drive->driver_data;
2642 idetape_stage_t *new_stage;
2643 unsigned long flags;
2646 #if IDETAPE_DEBUG_LOG
2647 if (tape->debug_level >= 3)
2648 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n");
2649 #endif /* IDETAPE_DEBUG_LOG */
2652 * Attempt to allocate a new stage.
2653 * Pay special attention to possible race conditions.
2655 while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
2656 spin_lock_irqsave(&tape->spinlock, flags);
2657 if (idetape_pipeline_active(tape)) {
2658 idetape_wait_for_request(drive, tape->active_data_request);
2659 spin_unlock_irqrestore(&tape->spinlock, flags);
2661 spin_unlock_irqrestore(&tape->spinlock, flags);
2662 idetape_insert_pipeline_into_queue(drive);
2663 if (idetape_pipeline_active(tape))
2666 * Linux is short on memory. Fallback to
2667 * non-pipelined operation mode for this request.
2669 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
2672 rq = &new_stage->rq;
2673 idetape_init_rq(rq, REQ_IDETAPE_WRITE);
2674 /* Doesn't actually matter - We always assume sequential access */
2675 rq->sector = tape->first_frame_position;
2676 rq->nr_sectors = rq->current_nr_sectors = blocks;
2678 idetape_switch_buffers(tape, new_stage);
2679 idetape_add_stage_tail(drive, new_stage);
2680 tape->pipeline_head++;
2681 calculate_speeds(drive);
2684 * Estimate whether the tape has stopped writing by checking
2685 * if our write pipeline is currently empty. If we are not
2686 * writing anymore, wait for the pipeline to be full enough
2687 * (90%) before starting to service requests, so that we will
2688 * be able to keep up with the higher speeds of the tape.
2690 if (!idetape_pipeline_active(tape)) {
2691 if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
2692 tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) {
2693 tape->measure_insert_time = 1;
2694 tape->insert_time = jiffies;
2695 tape->insert_size = 0;
2696 tape->insert_speed = 0;
2697 idetape_insert_pipeline_into_queue(drive);
2700 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
2701 /* Return a deferred error */
2707 * idetape_wait_for_pipeline will wait until all pending pipeline
2708 * requests are serviced. Typically called on device close.
2710 static void idetape_wait_for_pipeline (ide_drive_t *drive)
2712 idetape_tape_t *tape = drive->driver_data;
2713 unsigned long flags;
2715 while (tape->next_stage || idetape_pipeline_active(tape)) {
2716 idetape_insert_pipeline_into_queue(drive);
2717 spin_lock_irqsave(&tape->spinlock, flags);
2718 if (idetape_pipeline_active(tape))
2719 idetape_wait_for_request(drive, tape->active_data_request);
2720 spin_unlock_irqrestore(&tape->spinlock, flags);
2724 static void idetape_empty_write_pipeline (ide_drive_t *drive)
2726 idetape_tape_t *tape = drive->driver_data;
2728 struct idetape_bh *bh;
2730 if (tape->chrdev_direction != idetape_direction_write) {
2731 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
2734 if (tape->merge_stage_size > tape->stage_size) {
2735 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
2736 tape->merge_stage_size = tape->stage_size;
2738 if (tape->merge_stage_size) {
2739 blocks = tape->merge_stage_size / tape->tape_block_size;
2740 if (tape->merge_stage_size % tape->tape_block_size) {
2744 i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size;
2745 bh = tape->bh->b_reqnext;
2747 atomic_set(&bh->b_count, 0);
2754 printk(KERN_INFO "ide-tape: bug, bh NULL\n");
2757 min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count)));
2758 memset(bh->b_data + atomic_read(&bh->b_count), 0, min);
2759 atomic_add(min, &bh->b_count);
2764 (void) idetape_add_chrdev_write_request(drive, blocks);
2765 tape->merge_stage_size = 0;
2767 idetape_wait_for_pipeline(drive);
2768 if (tape->merge_stage != NULL) {
2769 __idetape_kfree_stage(tape->merge_stage);
2770 tape->merge_stage = NULL;
2772 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
2773 tape->chrdev_direction = idetape_direction_none;
2776 * On the next backup, perform the feedback loop again.
2777 * (I don't want to keep sense information between backups,
2778 * as some systems are constantly on, and the system load
2779 * can be totally different on the next backup).
2781 tape->max_stages = tape->min_pipeline;
2782 if (tape->first_stage != NULL ||
2783 tape->next_stage != NULL ||
2784 tape->last_stage != NULL ||
2785 tape->nr_stages != 0) {
2786 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
2787 "first_stage %p, next_stage %p, "
2788 "last_stage %p, nr_stages %d\n",
2789 tape->first_stage, tape->next_stage,
2790 tape->last_stage, tape->nr_stages);
2794 static void idetape_restart_speed_control (ide_drive_t *drive)
2796 idetape_tape_t *tape = drive->driver_data;
2798 tape->restart_speed_control_req = 0;
2799 tape->pipeline_head = 0;
2800 tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0;
2801 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0;
2802 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000;
2803 tape->uncontrolled_pipeline_head_speed = 0;
2804 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies;
2805 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies;
2808 static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
2810 idetape_tape_t *tape = drive->driver_data;
2811 idetape_stage_t *new_stage;
2814 u16 blocks = *(u16 *)&tape->caps[12];
2816 /* Initialize read operation */
2817 if (tape->chrdev_direction != idetape_direction_read) {
2818 if (tape->chrdev_direction == idetape_direction_write) {
2819 idetape_empty_write_pipeline(drive);
2820 idetape_flush_tape_buffers(drive);
2822 if (tape->merge_stage || tape->merge_stage_size) {
2823 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
2824 tape->merge_stage_size = 0;
2826 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
2828 tape->chrdev_direction = idetape_direction_read;
2831 * Issue a read 0 command to ensure that DSC handshake
2832 * is switched from completion mode to buffer available
2834 * No point in issuing this if DSC overlap isn't supported,
2835 * some drives (Seagate STT3401A) will return an error.
2837 if (drive->dsc_overlap) {
2838 bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
2839 if (bytes_read < 0) {
2840 __idetape_kfree_stage(tape->merge_stage);
2841 tape->merge_stage = NULL;
2842 tape->chrdev_direction = idetape_direction_none;
2847 if (tape->restart_speed_control_req)
2848 idetape_restart_speed_control(drive);
2849 idetape_init_rq(&rq, REQ_IDETAPE_READ);
2850 rq.sector = tape->first_frame_position;
2851 rq.nr_sectors = rq.current_nr_sectors = blocks;
2852 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) &&
2853 tape->nr_stages < max_stages) {
2854 new_stage = idetape_kmalloc_stage(tape);
2855 while (new_stage != NULL) {
2857 idetape_add_stage_tail(drive, new_stage);
2858 if (tape->nr_stages >= max_stages)
2860 new_stage = idetape_kmalloc_stage(tape);
2863 if (!idetape_pipeline_active(tape)) {
2864 if (tape->nr_pending_stages >= 3 * max_stages / 4) {
2865 tape->measure_insert_time = 1;
2866 tape->insert_time = jiffies;
2867 tape->insert_size = 0;
2868 tape->insert_speed = 0;
2869 idetape_insert_pipeline_into_queue(drive);
2876 * idetape_add_chrdev_read_request is called from idetape_chrdev_read
2877 * to service a character device read request and add read-ahead
2878 * requests to our pipeline.
2880 static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
2882 idetape_tape_t *tape = drive->driver_data;
2883 unsigned long flags;
2884 struct request *rq_ptr;
2887 #if IDETAPE_DEBUG_LOG
2888 if (tape->debug_level >= 4)
2889 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks);
2890 #endif /* IDETAPE_DEBUG_LOG */
2893 * If we are at a filemark, return a read length of 0
2895 if (test_bit(IDETAPE_FILEMARK, &tape->flags))
2899 * Wait for the next block to be available at the head
2902 idetape_initiate_read(drive, tape->max_stages);
2903 if (tape->first_stage == NULL) {
2904 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
2906 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh);
2908 idetape_wait_first_stage(drive);
2909 rq_ptr = &tape->first_stage->rq;
2910 bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors);
2911 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
2914 if (rq_ptr->errors == IDETAPE_ERROR_EOD)
2917 idetape_switch_buffers(tape, tape->first_stage);
2918 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
2919 set_bit(IDETAPE_FILEMARK, &tape->flags);
2920 spin_lock_irqsave(&tape->spinlock, flags);
2921 idetape_remove_stage_head(drive);
2922 spin_unlock_irqrestore(&tape->spinlock, flags);
2923 tape->pipeline_head++;
2924 calculate_speeds(drive);
2926 if (bytes_read > blocks * tape->tape_block_size) {
2927 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
2928 bytes_read = blocks * tape->tape_block_size;
2930 return (bytes_read);
2933 static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
2935 idetape_tape_t *tape = drive->driver_data;
2936 struct idetape_bh *bh;
2942 bh = tape->merge_stage->bh;
2943 count = min(tape->stage_size, bcount);
2945 blocks = count / tape->tape_block_size;
2947 atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size));
2948 memset(bh->b_data, 0, atomic_read(&bh->b_count));
2949 count -= atomic_read(&bh->b_count);
2952 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
2956 static int idetape_pipeline_size (ide_drive_t *drive)
2958 idetape_tape_t *tape = drive->driver_data;
2959 idetape_stage_t *stage;
2963 idetape_wait_for_pipeline(drive);
2964 stage = tape->first_stage;
2965 while (stage != NULL) {
2967 size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors);
2968 if (rq->errors == IDETAPE_ERROR_FILEMARK)
2969 size += tape->tape_block_size;
2970 stage = stage->next;
2972 size += tape->merge_stage_size;
2977 * Rewinds the tape to the Beginning Of the current Partition (BOP).
2979 * We currently support only one partition.
2981 static int idetape_rewind_tape (ide_drive_t *drive)
2985 #if IDETAPE_DEBUG_LOG
2986 idetape_tape_t *tape = drive->driver_data;
2987 if (tape->debug_level >= 2)
2988 printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n");
2989 #endif /* IDETAPE_DEBUG_LOG */
2991 idetape_create_rewind_cmd(drive, &pc);
2992 retval = idetape_queue_pc_tail(drive, &pc);
2996 idetape_create_read_position_cmd(&pc);
2997 retval = idetape_queue_pc_tail(drive, &pc);
3004 * Our special ide-tape ioctl's.
3006 * Currently there aren't any ioctl's.
3007 * mtio.h compatible commands should be issued to the character device
3010 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg)
3012 idetape_tape_t *tape = drive->driver_data;
3013 idetape_config_t config;
3014 void __user *argp = (void __user *)arg;
3016 #if IDETAPE_DEBUG_LOG
3017 if (tape->debug_level >= 4)
3018 printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n");
3019 #endif /* IDETAPE_DEBUG_LOG */
3022 if (copy_from_user(&config, argp, sizeof (idetape_config_t)))
3024 tape->best_dsc_rw_frequency = config.dsc_rw_frequency;
3025 tape->max_stages = config.nr_stages;
3028 config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency;
3029 config.nr_stages = tape->max_stages;
3030 if (copy_to_user(argp, &config, sizeof (idetape_config_t)))
3040 * idetape_space_over_filemarks is now a bit more complicated than just
3041 * passing the command to the tape since we may have crossed some
3042 * filemarks during our pipelined read-ahead mode.
3044 * As a minor side effect, the pipeline enables us to support MTFSFM when
3045 * the filemark is in our internal pipeline even if the tape doesn't
3046 * support spacing over filemarks in the reverse direction.
3048 static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
3050 idetape_tape_t *tape = drive->driver_data;
3052 unsigned long flags;
3054 int sprev = !!(tape->caps[4] & 0x20);
3058 if (MTBSF == mt_op || MTBSFM == mt_op) {
3061 mt_count = - mt_count;
3064 if (tape->chrdev_direction == idetape_direction_read) {
3066 * We have a read-ahead buffer. Scan it for crossed
3069 tape->merge_stage_size = 0;
3070 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
3072 while (tape->first_stage != NULL) {
3073 if (count == mt_count) {
3074 if (mt_op == MTFSFM)
3075 set_bit(IDETAPE_FILEMARK, &tape->flags);
3078 spin_lock_irqsave(&tape->spinlock, flags);
3079 if (tape->first_stage == tape->active_stage) {
3081 * We have reached the active stage in the read pipeline.
3082 * There is no point in allowing the drive to continue
3083 * reading any farther, so we stop the pipeline.
3085 * This section should be moved to a separate subroutine,
3086 * because a similar function is performed in
3087 * __idetape_discard_read_pipeline(), for example.
3089 tape->next_stage = NULL;
3090 spin_unlock_irqrestore(&tape->spinlock, flags);
3091 idetape_wait_first_stage(drive);
3092 tape->next_stage = tape->first_stage->next;
3094 spin_unlock_irqrestore(&tape->spinlock, flags);
3095 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
3097 idetape_remove_stage_head(drive);
3099 idetape_discard_read_pipeline(drive, 0);
3103 * The filemark was not found in our internal pipeline.
3104 * Now we can issue the space command.
3109 idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
3110 return (idetape_queue_pc_tail(drive, &pc));
3115 retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count);
3116 if (retval) return (retval);
3117 count = (MTBSFM == mt_op ? 1 : -1);
3118 return (idetape_space_over_filemarks(drive, MTFSF, count));
3120 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
3127 * Our character device read / write functions.
3129 * The tape is optimized to maximize throughput when it is transferring
3130 * an integral number of the "continuous transfer limit", which is
3131 * a parameter of the specific tape (26 KB on my particular tape).
3132 * (32 kB for Onstream)
3134 * As of version 1.3 of the driver, the character device provides an
3135 * abstract continuous view of the media - any mix of block sizes (even 1
3136 * byte) on the same backup/restore procedure is supported. The driver
3137 * will internally convert the requests to the recommended transfer unit,
3138 * so that an unmatch between the user's block size to the recommended
3139 * size will only result in a (slightly) increased driver overhead, but
3140 * will no longer hit performance.
3141 * This is not applicable to Onstream.
3143 static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
3144 size_t count, loff_t *ppos)
3146 struct ide_tape_obj *tape = ide_tape_f(file);
3147 ide_drive_t *drive = tape->drive;
3148 ssize_t bytes_read,temp, actually_read = 0, rc;
3150 u16 ctl = *(u16 *)&tape->caps[12];
3152 #if IDETAPE_DEBUG_LOG
3153 if (tape->debug_level >= 3)
3154 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count);
3155 #endif /* IDETAPE_DEBUG_LOG */
3157 if (tape->chrdev_direction != idetape_direction_read) {
3158 if (test_bit(IDETAPE_DETECT_BS, &tape->flags))
3159 if (count > tape->tape_block_size &&
3160 (count % tape->tape_block_size) == 0)
3161 tape->user_bs_factor = count / tape->tape_block_size;
3163 if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0)
3167 if (tape->merge_stage_size) {
3168 actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count);
3169 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read))
3171 buf += actually_read;
3172 tape->merge_stage_size -= actually_read;
3173 count -= actually_read;
3175 while (count >= tape->stage_size) {
3176 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
3177 if (bytes_read <= 0)
3179 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read))
3182 count -= bytes_read;
3183 actually_read += bytes_read;
3186 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
3187 if (bytes_read <= 0)
3189 temp = min((unsigned long)count, (unsigned long)bytes_read);
3190 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp))
3192 actually_read += temp;
3193 tape->merge_stage_size = bytes_read-temp;
3196 if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) {
3197 #if IDETAPE_DEBUG_LOG
3198 if (tape->debug_level >= 2)
3199 printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name);
3201 idetape_space_over_filemarks(drive, MTFSF, 1);
3205 return (ret) ? ret : actually_read;
3208 static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
3209 size_t count, loff_t *ppos)
3211 struct ide_tape_obj *tape = ide_tape_f(file);
3212 ide_drive_t *drive = tape->drive;
3213 ssize_t actually_written = 0;
3215 u16 ctl = *(u16 *)&tape->caps[12];
3217 /* The drive is write protected. */
3218 if (tape->write_prot)
3221 #if IDETAPE_DEBUG_LOG
3222 if (tape->debug_level >= 3)
3223 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, "
3224 "count %Zd\n", count);
3225 #endif /* IDETAPE_DEBUG_LOG */
3227 /* Initialize write operation */
3228 if (tape->chrdev_direction != idetape_direction_write) {
3229 if (tape->chrdev_direction == idetape_direction_read)
3230 idetape_discard_read_pipeline(drive, 1);
3231 if (tape->merge_stage || tape->merge_stage_size) {
3232 printk(KERN_ERR "ide-tape: merge_stage_size "
3233 "should be 0 now\n");
3234 tape->merge_stage_size = 0;
3236 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
3238 tape->chrdev_direction = idetape_direction_write;
3239 idetape_init_merge_stage(tape);
3242 * Issue a write 0 command to ensure that DSC handshake
3243 * is switched from completion mode to buffer available
3245 * No point in issuing this if DSC overlap isn't supported,
3246 * some drives (Seagate STT3401A) will return an error.
3248 if (drive->dsc_overlap) {
3249 ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
3251 __idetape_kfree_stage(tape->merge_stage);
3252 tape->merge_stage = NULL;
3253 tape->chrdev_direction = idetape_direction_none;
3260 if (tape->restart_speed_control_req)
3261 idetape_restart_speed_control(drive);
3262 if (tape->merge_stage_size) {
3263 if (tape->merge_stage_size >= tape->stage_size) {
3264 printk(KERN_ERR "ide-tape: bug: merge buffer too big\n");
3265 tape->merge_stage_size = 0;
3267 actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count);
3268 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written))
3270 buf += actually_written;
3271 tape->merge_stage_size += actually_written;
3272 count -= actually_written;
3274 if (tape->merge_stage_size == tape->stage_size) {
3276 tape->merge_stage_size = 0;
3277 retval = idetape_add_chrdev_write_request(drive, ctl);
3282 while (count >= tape->stage_size) {
3284 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size))
3286 buf += tape->stage_size;
3287 count -= tape->stage_size;
3288 retval = idetape_add_chrdev_write_request(drive, ctl);
3289 actually_written += tape->stage_size;
3294 actually_written += count;
3295 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count))
3297 tape->merge_stage_size += count;
3299 return (ret) ? ret : actually_written;
3302 static int idetape_write_filemark (ide_drive_t *drive)
3306 /* Write a filemark */
3307 idetape_create_write_filemark_cmd(drive, &pc, 1);
3308 if (idetape_queue_pc_tail(drive, &pc)) {
3309 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
3316 * idetape_mtioctop is called from idetape_chrdev_ioctl when
3317 * the general mtio MTIOCTOP ioctl is requested.
3319 * We currently support the following mtio.h operations:
3321 * MTFSF - Space over mt_count filemarks in the positive direction.
3322 * The tape is positioned after the last spaced filemark.
3324 * MTFSFM - Same as MTFSF, but the tape is positioned before the
3327 * MTBSF - Steps background over mt_count filemarks, tape is
3328 * positioned before the last filemark.
3330 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark.
3334 * MTBSF and MTBSFM are not supported when the tape doesn't
3335 * support spacing over filemarks in the reverse direction.
3336 * In this case, MTFSFM is also usually not supported (it is
3337 * supported in the rare case in which we crossed the filemark
3338 * during our read-ahead pipelined operation mode).
3340 * MTWEOF - Writes mt_count filemarks. Tape is positioned after
3341 * the last written filemark.
3343 * MTREW - Rewinds tape.
3345 * MTLOAD - Loads the tape.
3347 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and
3348 * MTUNLOAD prevents further access until the media is replaced.
3350 * MTNOP - Flushes tape buffers.
3352 * MTRETEN - Retension media. This typically consists of one end
3353 * to end pass on the media.
3355 * MTEOM - Moves to the end of recorded data.
3357 * MTERASE - Erases tape.
3359 * MTSETBLK - Sets the user block size to mt_count bytes. If
3360 * mt_count is 0, we will attempt to autodetect
3363 * MTSEEK - Positions the tape in a specific block number, where
3364 * each block is assumed to contain which user_block_size
3367 * MTSETPART - Switches to another tape partition.
3369 * MTLOCK - Locks the tape door.
3371 * MTUNLOCK - Unlocks the tape door.
3373 * The following commands are currently not supported:
3375 * MTFSS, MTBSS, MTWSM, MTSETDENSITY,
3376 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD.
3378 static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count)
3380 idetape_tape_t *tape = drive->driver_data;
3384 #if IDETAPE_DEBUG_LOG
3385 if (tape->debug_level >= 1)
3386 printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: "
3387 "mt_op=%d, mt_count=%d\n", mt_op, mt_count);
3388 #endif /* IDETAPE_DEBUG_LOG */
3390 * Commands which need our pipelined read-ahead stages.
3399 return (idetape_space_over_filemarks(drive,mt_op,mt_count));
3405 if (tape->write_prot)
3407 idetape_discard_read_pipeline(drive, 1);
3408 for (i = 0; i < mt_count; i++) {
3409 retval = idetape_write_filemark(drive);
3415 idetape_discard_read_pipeline(drive, 0);
3416 if (idetape_rewind_tape(drive))
3420 idetape_discard_read_pipeline(drive, 0);
3421 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
3422 return (idetape_queue_pc_tail(drive, &pc));
3426 * If door is locked, attempt to unlock before
3427 * attempting to eject.
3429 if (tape->door_locked) {
3430 if (idetape_create_prevent_cmd(drive, &pc, 0))
3431 if (!idetape_queue_pc_tail(drive, &pc))
3432 tape->door_locked = DOOR_UNLOCKED;
3434 idetape_discard_read_pipeline(drive, 0);
3435 idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK);
3436 retval = idetape_queue_pc_tail(drive, &pc);
3438 clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
3441 idetape_discard_read_pipeline(drive, 0);
3442 return (idetape_flush_tape_buffers(drive));
3444 idetape_discard_read_pipeline(drive, 0);
3445 idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
3446 return (idetape_queue_pc_tail(drive, &pc));
3448 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
3449 return (idetape_queue_pc_tail(drive, &pc));
3451 (void) idetape_rewind_tape(drive);
3452 idetape_create_erase_cmd(&pc);
3453 return (idetape_queue_pc_tail(drive, &pc));
3456 if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size)
3458 tape->user_bs_factor = mt_count / tape->tape_block_size;
3459 clear_bit(IDETAPE_DETECT_BS, &tape->flags);
3461 set_bit(IDETAPE_DETECT_BS, &tape->flags);
3464 idetape_discard_read_pipeline(drive, 0);
3465 return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0);
3467 idetape_discard_read_pipeline(drive, 0);
3468 return (idetape_position_tape(drive, 0, mt_count, 0));
3472 if (!idetape_create_prevent_cmd(drive, &pc, 1))
3474 retval = idetape_queue_pc_tail(drive, &pc);
3475 if (retval) return retval;
3476 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
3479 if (!idetape_create_prevent_cmd(drive, &pc, 0))
3481 retval = idetape_queue_pc_tail(drive, &pc);
3482 if (retval) return retval;
3483 tape->door_locked = DOOR_UNLOCKED;
3486 printk(KERN_ERR "ide-tape: MTIO operation %d not "
3487 "supported\n", mt_op);
3493 * Our character device ioctls.
3495 * General mtio.h magnetic io commands are supported here, and not in
3496 * the corresponding block interface.
3498 * The following ioctls are supported:
3500 * MTIOCTOP - Refer to idetape_mtioctop for detailed description.
3502 * MTIOCGET - The mt_dsreg field in the returned mtget structure
3503 * will be set to (user block size in bytes <<
3504 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK.
3506 * The mt_blkno is set to the current user block number.
3507 * The other mtget fields are not supported.
3509 * MTIOCPOS - The current tape "block position" is returned. We
3510 * assume that each block contains user_block_size
3513 * Our own ide-tape ioctls are supported on both interfaces.
3515 static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
3517 struct ide_tape_obj *tape = ide_tape_f(file);
3518 ide_drive_t *drive = tape->drive;
3522 int block_offset = 0, position = tape->first_frame_position;
3523 void __user *argp = (void __user *)arg;
3525 #if IDETAPE_DEBUG_LOG
3526 if (tape->debug_level >= 3)
3527 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, "
3529 #endif /* IDETAPE_DEBUG_LOG */
3531 tape->restart_speed_control_req = 1;
3532 if (tape->chrdev_direction == idetape_direction_write) {
3533 idetape_empty_write_pipeline(drive);
3534 idetape_flush_tape_buffers(drive);
3536 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
3537 block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor);
3538 if ((position = idetape_read_position(drive)) < 0)
3543 if (copy_from_user(&mtop, argp, sizeof (struct mtop)))
3545 return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count));
3547 memset(&mtget, 0, sizeof (struct mtget));
3548 mtget.mt_type = MT_ISSCSI2;
3549 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
3550 mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
3551 if (tape->drv_write_prot) {
3552 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
3554 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
3558 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
3559 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
3563 if (tape->chrdev_direction == idetape_direction_read)
3564 idetape_discard_read_pipeline(drive, 1);
3565 return idetape_blkdev_ioctl(drive, cmd, arg);
3569 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive);
3572 * Our character device open function.
3574 static int idetape_chrdev_open (struct inode *inode, struct file *filp)
3576 unsigned int minor = iminor(inode), i = minor & ~0xc0;
3578 idetape_tape_t *tape;
3583 * We really want to do nonseekable_open(inode, filp); here, but some
3584 * versions of tar incorrectly call lseek on tapes and bail out if that
3585 * fails. So we disallow pread() and pwrite(), but permit lseeks.
3587 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
3589 #if IDETAPE_DEBUG_LOG
3590 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n");
3591 #endif /* IDETAPE_DEBUG_LOG */
3593 if (i >= MAX_HWIFS * MAX_DRIVES)
3596 if (!(tape = ide_tape_chrdev_get(i)))
3599 drive = tape->drive;
3601 filp->private_data = tape;
3603 if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) {
3608 retval = idetape_wait_ready(drive, 60 * HZ);
3610 clear_bit(IDETAPE_BUSY, &tape->flags);
3611 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
3615 idetape_read_position(drive);
3616 if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
3617 (void)idetape_rewind_tape(drive);
3619 if (tape->chrdev_direction != idetape_direction_read)
3620 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
3622 /* Read block size and write protect status from drive. */
3623 idetape_get_blocksize_from_block_descriptor(drive);
3625 /* Set write protect flag if device is opened as read-only. */
3626 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
3627 tape->write_prot = 1;
3629 tape->write_prot = tape->drv_write_prot;
3631 /* Make sure drive isn't write protected if user wants to write. */
3632 if (tape->write_prot) {
3633 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
3634 (filp->f_flags & O_ACCMODE) == O_RDWR) {
3635 clear_bit(IDETAPE_BUSY, &tape->flags);
3642 * Lock the tape drive door so user can't eject.
3644 if (tape->chrdev_direction == idetape_direction_none) {
3645 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
3646 if (!idetape_queue_pc_tail(drive, &pc)) {
3647 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
3648 tape->door_locked = DOOR_LOCKED;
3652 idetape_restart_speed_control(drive);
3653 tape->restart_speed_control_req = 0;
3661 static void idetape_write_release (ide_drive_t *drive, unsigned int minor)
3663 idetape_tape_t *tape = drive->driver_data;
3665 idetape_empty_write_pipeline(drive);
3666 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
3667 if (tape->merge_stage != NULL) {
3668 idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1));
3669 __idetape_kfree_stage(tape->merge_stage);
3670 tape->merge_stage = NULL;
3672 idetape_write_filemark(drive);
3673 idetape_flush_tape_buffers(drive);
3674 idetape_flush_tape_buffers(drive);
3678 * Our character device release function.
3680 static int idetape_chrdev_release (struct inode *inode, struct file *filp)
3682 struct ide_tape_obj *tape = ide_tape_f(filp);
3683 ide_drive_t *drive = tape->drive;
3685 unsigned int minor = iminor(inode);
3688 tape = drive->driver_data;
3689 #if IDETAPE_DEBUG_LOG
3690 if (tape->debug_level >= 3)
3691 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n");
3692 #endif /* IDETAPE_DEBUG_LOG */
3694 if (tape->chrdev_direction == idetape_direction_write)
3695 idetape_write_release(drive, minor);
3696 if (tape->chrdev_direction == idetape_direction_read) {
3698 idetape_discard_read_pipeline(drive, 1);
3700 idetape_wait_for_pipeline(drive);
3702 if (tape->cache_stage != NULL) {
3703 __idetape_kfree_stage(tape->cache_stage);
3704 tape->cache_stage = NULL;
3706 if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags))
3707 (void) idetape_rewind_tape(drive);
3708 if (tape->chrdev_direction == idetape_direction_none) {
3709 if (tape->door_locked == DOOR_LOCKED) {
3710 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
3711 if (!idetape_queue_pc_tail(drive, &pc))
3712 tape->door_locked = DOOR_UNLOCKED;
3716 clear_bit(IDETAPE_BUSY, &tape->flags);
3723 * idetape_identify_device is called to check the contents of the
3724 * ATAPI IDENTIFY command results. We return:
3726 * 1 If the tape can be supported by us, based on the information
3729 * 0 If this tape driver is not currently supported by us.
3731 static int idetape_identify_device (ide_drive_t *drive)
3733 struct idetape_id_gcw gcw;
3734 struct hd_driveid *id = drive->id;
3736 if (drive->id_read == 0)
3739 *((unsigned short *) &gcw) = id->config;
3741 /* Check that we can support this device */
3743 if (gcw.protocol != 2)
3744 printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n",
3746 else if (gcw.device_type != 1)
3747 printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set "
3748 "to tape\n", gcw.device_type);
3749 else if (!gcw.removable)
3750 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
3751 else if (gcw.packet_size != 0) {
3752 printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12 "
3753 "bytes long\n", gcw.packet_size);
3760 * Use INQUIRY to get the firmware revision
3762 static void idetape_get_inquiry_results (ide_drive_t *drive)
3765 idetape_tape_t *tape = drive->driver_data;
3767 idetape_inquiry_result_t *inquiry;
3769 idetape_create_inquiry_cmd(&pc);
3770 if (idetape_queue_pc_tail(drive, &pc)) {
3771 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name);
3774 inquiry = (idetape_inquiry_result_t *) pc.buffer;
3775 memcpy(tape->vendor_id, inquiry->vendor_id, 8);
3776 memcpy(tape->product_id, inquiry->product_id, 16);
3777 memcpy(tape->firmware_revision, inquiry->revision_level, 4);
3778 ide_fixstring(tape->vendor_id, 10, 0);
3779 ide_fixstring(tape->product_id, 18, 0);
3780 ide_fixstring(tape->firmware_revision, 6, 0);
3781 r = tape->firmware_revision;
3782 if (*(r + 1) == '.')
3783 tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0';
3784 printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", drive->name, tape->name, tape->vendor_id, tape->product_id, tape->firmware_revision);
3788 * Ask the tape about its various parameters. In particular, we will adjust our
3789 * data transfer buffer size to the recommended value as returned by the tape.
3791 static void idetape_get_mode_sense_results (ide_drive_t *drive)
3793 idetape_tape_t *tape = drive->driver_data;
3796 u8 speed, max_speed;
3798 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
3799 if (idetape_queue_pc_tail(drive, &pc)) {
3800 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
3801 " some default values\n");
3802 tape->tape_block_size = 512;
3803 put_unaligned(52, (u16 *)&tape->caps[12]);
3804 put_unaligned(540, (u16 *)&tape->caps[14]);
3805 put_unaligned(6*52, (u16 *)&tape->caps[16]);
3808 caps = pc.buffer + 4 + pc.buffer[3];
3810 /* convert to host order and save for later use */
3811 speed = be16_to_cpu(*(u16 *)&caps[14]);
3812 max_speed = be16_to_cpu(*(u16 *)&caps[8]);
3814 put_unaligned(max_speed, (u16 *)&caps[8]);
3815 put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]);
3816 put_unaligned(speed, (u16 *)&caps[14]);
3817 put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]);
3820 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
3821 "(assuming 650KB/sec)\n", drive->name);
3822 put_unaligned(650, (u16 *)&caps[14]);
3825 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
3826 "(assuming 650KB/sec)\n", drive->name);
3827 put_unaligned(650, (u16 *)&caps[8]);
3830 memcpy(&tape->caps, caps, 20);
3832 tape->tape_block_size = 512;
3833 else if (caps[7] & 0x04)
3834 tape->tape_block_size = 1024;
3838 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor
3839 * and if it succeeds sets the tape block size with the reported value
3841 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive)
3844 idetape_tape_t *tape = drive->driver_data;
3846 idetape_parameter_block_descriptor_t *block_descrp;
3848 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
3849 if (idetape_queue_pc_tail(drive, &pc)) {
3850 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
3851 if (tape->tape_block_size == 0) {
3852 printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n");
3853 tape->tape_block_size = 32768;
3857 block_descrp = (idetape_parameter_block_descriptor_t *)(pc.buffer + 4);
3858 tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2];
3859 tape->drv_write_prot = (pc.buffer[2] & 0x80) >> 7;
3862 #ifdef CONFIG_IDE_PROC_FS
3863 static void idetape_add_settings (ide_drive_t *drive)
3865 idetape_tape_t *tape = drive->driver_data;
3868 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
3870 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
3871 1, 2, (u16 *)&tape->caps[16], NULL);
3872 ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
3873 ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL);
3874 ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
3875 ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL);
3876 ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL);
3877 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
3878 1, 1, (u16 *)&tape->caps[14], NULL);
3879 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL);
3880 ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL);
3881 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
3882 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL);
3883 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL);
3884 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL);
3885 ide_add_setting(drive, "debug_level", SETTING_RW, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL);
3888 static inline void idetape_add_settings(ide_drive_t *drive) { ; }
3892 * ide_setup is called to:
3894 * 1. Initialize our various state variables.
3895 * 2. Ask the tape for its capabilities.
3896 * 3. Allocate a buffer which will be used for data
3897 * transfer. The buffer size is chosen based on
3898 * the recommendation which we received in step (2).
3900 * Note that at this point ide.c already assigned us an irq, so that
3901 * we can queue requests here and wait for their completion.
3903 static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
3905 unsigned long t1, tmid, tn, t;
3907 struct idetape_id_gcw gcw;
3910 u16 *ctl = (u16 *)&tape->caps[12];
3912 spin_lock_init(&tape->spinlock);
3913 drive->dsc_overlap = 1;
3914 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
3915 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
3917 drive->dsc_overlap = 0;
3919 /* Seagate Travan drives do not support DSC overlap. */
3920 if (strstr(drive->id->model, "Seagate STT3401"))
3921 drive->dsc_overlap = 0;
3922 tape->minor = minor;
3923 tape->name[0] = 'h';
3924 tape->name[1] = 't';
3925 tape->name[2] = '0' + minor;
3926 tape->chrdev_direction = idetape_direction_none;
3927 tape->pc = tape->pc_stack;
3928 tape->max_insert_speed = 10000;
3929 tape->speed_control = 1;
3930 *((unsigned short *) &gcw) = drive->id->config;
3931 if (gcw.drq_type == 1)
3932 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags);
3934 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10;
3936 idetape_get_inquiry_results(drive);
3937 idetape_get_mode_sense_results(drive);
3938 idetape_get_blocksize_from_block_descriptor(drive);
3939 tape->user_bs_factor = 1;
3940 tape->stage_size = *ctl * tape->tape_block_size;
3941 while (tape->stage_size > 0xffff) {
3942 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
3944 tape->stage_size = *ctl * tape->tape_block_size;
3946 stage_size = tape->stage_size;
3947 tape->pages_per_stage = stage_size / PAGE_SIZE;
3948 if (stage_size % PAGE_SIZE) {
3949 tape->pages_per_stage++;
3950 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
3953 /* Select the "best" DSC read/write polling freq and pipeline size. */
3954 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
3956 tape->max_stages = speed * 1000 * 10 / tape->stage_size;
3959 * Limit memory use for pipeline to 10% of physical memory
3962 if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10)
3963 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size);
3964 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
3965 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
3966 tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
3967 if (tape->max_stages == 0)
3968 tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1;
3970 t1 = (tape->stage_size * HZ) / (speed * 1000);
3971 tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125);
3972 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
3974 if (tape->max_stages)
3980 * Ensure that the number we got makes sense; limit
3981 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
3983 tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN);
3984 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
3985 "%dkB pipeline, %lums tDSC%s\n",
3986 drive->name, tape->name, *(u16 *)&tape->caps[14],
3987 (*(u16 *)&tape->caps[16] * 512) / tape->stage_size,
3988 tape->stage_size / 1024,
3989 tape->max_stages * tape->stage_size / 1024,
3990 tape->best_dsc_rw_frequency * 1000 / HZ,
3991 drive->using_dma ? ", DMA":"");
3993 idetape_add_settings(drive);
3996 static void ide_tape_remove(ide_drive_t *drive)
3998 idetape_tape_t *tape = drive->driver_data;
4000 ide_proc_unregister_driver(drive, tape->driver);
4002 ide_unregister_region(tape->disk);
4007 static void ide_tape_release(struct kref *kref)
4009 struct ide_tape_obj *tape = to_ide_tape(kref);
4010 ide_drive_t *drive = tape->drive;
4011 struct gendisk *g = tape->disk;
4013 BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
4015 drive->dsc_overlap = 0;
4016 drive->driver_data = NULL;
4017 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
4018 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128));
4019 idetape_devs[tape->minor] = NULL;
4020 g->private_data = NULL;
4025 #ifdef CONFIG_IDE_PROC_FS
4026 static int proc_idetape_read_name
4027 (char *page, char **start, off_t off, int count, int *eof, void *data)
4029 ide_drive_t *drive = (ide_drive_t *) data;
4030 idetape_tape_t *tape = drive->driver_data;
4034 len = sprintf(out, "%s\n", tape->name);
4035 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
4038 static ide_proc_entry_t idetape_proc[] = {
4039 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
4040 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
4041 { NULL, 0, NULL, NULL }
4045 static int ide_tape_probe(ide_drive_t *);
4047 static ide_driver_t idetape_driver = {
4049 .owner = THIS_MODULE,
4051 .bus = &ide_bus_type,
4053 .probe = ide_tape_probe,
4054 .remove = ide_tape_remove,
4055 .version = IDETAPE_VERSION,
4057 .supports_dsc_overlap = 1,
4058 .do_request = idetape_do_request,
4059 .end_request = idetape_end_request,
4060 .error = __ide_error,
4061 .abort = __ide_abort,
4062 #ifdef CONFIG_IDE_PROC_FS
4063 .proc = idetape_proc,
4068 * Our character device supporting functions, passed to register_chrdev.
4070 static const struct file_operations idetape_fops = {
4071 .owner = THIS_MODULE,
4072 .read = idetape_chrdev_read,
4073 .write = idetape_chrdev_write,
4074 .ioctl = idetape_chrdev_ioctl,
4075 .open = idetape_chrdev_open,
4076 .release = idetape_chrdev_release,
4079 static int idetape_open(struct inode *inode, struct file *filp)
4081 struct gendisk *disk = inode->i_bdev->bd_disk;
4082 struct ide_tape_obj *tape;
4084 if (!(tape = ide_tape_get(disk)))
4090 static int idetape_release(struct inode *inode, struct file *filp)
4092 struct gendisk *disk = inode->i_bdev->bd_disk;
4093 struct ide_tape_obj *tape = ide_tape_g(disk);
4100 static int idetape_ioctl(struct inode *inode, struct file *file,
4101 unsigned int cmd, unsigned long arg)
4103 struct block_device *bdev = inode->i_bdev;
4104 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
4105 ide_drive_t *drive = tape->drive;
4106 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
4108 err = idetape_blkdev_ioctl(drive, cmd, arg);
4112 static struct block_device_operations idetape_block_ops = {
4113 .owner = THIS_MODULE,
4114 .open = idetape_open,
4115 .release = idetape_release,
4116 .ioctl = idetape_ioctl,
4119 static int ide_tape_probe(ide_drive_t *drive)
4121 idetape_tape_t *tape;
4125 if (!strstr("ide-tape", drive->driver_req))
4127 if (!drive->present)
4129 if (drive->media != ide_tape)
4131 if (!idetape_identify_device (drive)) {
4132 printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
4136 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name);
4139 if (strstr(drive->id->model, "OnStream DI-")) {
4140 printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name);
4141 printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n");
4143 tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL);
4145 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
4149 g = alloc_disk(1 << PARTN_BITS);
4153 ide_init_disk(g, drive);
4155 ide_proc_register_driver(drive, &idetape_driver);
4157 kref_init(&tape->kref);
4159 tape->drive = drive;
4160 tape->driver = &idetape_driver;
4163 g->private_data = &tape->driver;
4165 drive->driver_data = tape;
4167 mutex_lock(&idetape_ref_mutex);
4168 for (minor = 0; idetape_devs[minor]; minor++)
4170 idetape_devs[minor] = tape;
4171 mutex_unlock(&idetape_ref_mutex);
4173 idetape_setup(drive, tape, minor);
4175 device_create(idetape_sysfs_class, &drive->gendev,
4176 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name);
4177 device_create(idetape_sysfs_class, &drive->gendev,
4178 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name);
4180 g->fops = &idetape_block_ops;
4181 ide_register_region(g);
4191 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
4192 MODULE_LICENSE("GPL");
4194 static void __exit idetape_exit (void)
4196 driver_unregister(&idetape_driver.gen_driver);
4197 class_destroy(idetape_sysfs_class);
4198 unregister_chrdev(IDETAPE_MAJOR, "ht");
4201 static int __init idetape_init(void)
4204 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
4205 if (IS_ERR(idetape_sysfs_class)) {
4206 idetape_sysfs_class = NULL;
4207 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
4212 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
4213 printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
4215 goto out_free_class;
4218 error = driver_register(&idetape_driver.gen_driver);
4220 goto out_free_driver;
4225 driver_unregister(&idetape_driver.gen_driver);
4227 class_destroy(idetape_sysfs_class);
4232 MODULE_ALIAS("ide:*m-tape*");
4233 module_init(idetape_init);
4234 module_exit(idetape_exit);
4235 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);