2 * IDE ATAPI streaming tape driver.
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
18 #define IDETAPE_VERSION "1.20"
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/timer.h>
27 #include <linux/interrupt.h>
28 #include <linux/jiffies.h>
29 #include <linux/major.h>
30 #include <linux/errno.h>
31 #include <linux/genhd.h>
32 #include <linux/slab.h>
33 #include <linux/pci.h>
34 #include <linux/ide.h>
35 #include <linux/smp_lock.h>
36 #include <linux/completion.h>
37 #include <linux/bitops.h>
38 #include <linux/mutex.h>
39 #include <scsi/scsi.h>
41 #include <asm/byteorder.h>
42 #include <linux/irq.h>
43 #include <linux/uaccess.h>
45 #include <asm/unaligned.h>
46 #include <linux/mtio.h>
49 /* output errors only */
51 /* output all sense key/asc */
53 /* info regarding all chrdev-related procedures */
54 DBG_CHRDEV = (1 << 2),
55 /* all remaining procedures */
57 /* buffer alloc info (pc_stack & rq_stack) */
58 DBG_PCRQ_STACK = (1 << 4),
61 /* define to see debug info */
62 #define IDETAPE_DEBUG_LOG 0
65 #define debug_log(lvl, fmt, args...) \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
71 #define debug_log(lvl, fmt, args...) do {} while (0)
74 /**************************** Tunable parameters *****************************/
78 * Pipelined mode parameters.
80 * We try to use the minimum number of stages which is enough to keep the tape
81 * constantly streaming. To accomplish that, we implement a feedback loop around
82 * the maximum number of stages:
84 * We start from MIN maximum stages (we will not even use MIN stages if we don't
85 * need them), increment it by RATE*(MAX-MIN) whenever we sense that the
86 * pipeline is empty, until we reach the optimum value or until we reach MAX.
88 * Setting the following parameter to 0 is illegal: the pipelined mode cannot be
89 * disabled (idetape_calculate_speeds() divides by tape->max_stages.)
91 #define IDETAPE_MIN_PIPELINE_STAGES 1
92 #define IDETAPE_MAX_PIPELINE_STAGES 400
93 #define IDETAPE_INCREASE_STAGES_RATE 20
96 * After each failed packet command we issue a request sense command and retry
97 * the packet command IDETAPE_MAX_PC_RETRIES times.
99 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
101 #define IDETAPE_MAX_PC_RETRIES 3
104 * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE
105 * bytes. This is used for several packet commands (Not for READ/WRITE commands)
107 #define IDETAPE_PC_BUFFER_SIZE 256
110 * In various places in the driver, we need to allocate storage
111 * for packet commands and requests, which will remain valid while
112 * we leave the driver to wait for an interrupt or a timeout event.
114 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
117 * Some drives (for example, Seagate STT3401A Travan) require a very long
118 * timeout, because they don't return an interrupt or clear their busy bit
119 * until after the command completes (even retension commands).
121 #define IDETAPE_WAIT_CMD (900*HZ)
124 * The following parameter is used to select the point in the internal tape fifo
125 * in which we will start to refill the buffer. Decreasing the following
126 * parameter will improve the system's latency and interactive response, while
127 * using a high value might improve system throughput.
129 #define IDETAPE_FIFO_THRESHOLD 2
132 * DSC polling parameters.
134 * Polling for DSC (a single bit in the status register) is a very important
135 * function in ide-tape. There are two cases in which we poll for DSC:
137 * 1. Before a read/write packet command, to ensure that we can transfer data
138 * from/to the tape's data buffers, without causing an actual media access.
139 * In case the tape is not ready yet, we take out our request from the device
140 * request queue, so that ide.c could service requests from the other device
141 * on the same interface in the meantime.
143 * 2. After the successful initialization of a "media access packet command",
144 * which is a command that can take a long time to complete (the interval can
145 * range from several seconds to even an hour). Again, we postpone our request
146 * in the middle to free the bus for the other device. The polling frequency
147 * here should be lower than the read/write frequency since those media access
148 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
149 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
150 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
152 * We also set a timeout for the timer, in case something goes wrong. The
153 * timeout should be longer then the maximum execution time of a tape operation.
157 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
158 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
159 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
160 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
161 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
162 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
163 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
165 /*************************** End of tunable parameters ***********************/
167 /* Read/Write error simulation */
168 #define SIMULATE_ERRORS 0
170 /* tape directions */
172 IDETAPE_DIR_NONE = (1 << 0),
173 IDETAPE_DIR_READ = (1 << 1),
174 IDETAPE_DIR_WRITE = (1 << 2),
180 struct idetape_bh *b_reqnext;
184 /* Tape door status */
185 #define DOOR_UNLOCKED 0
186 #define DOOR_LOCKED 1
187 #define DOOR_EXPLICITLY_LOCKED 2
189 /* Some defines for the SPACE command */
190 #define IDETAPE_SPACE_OVER_FILEMARK 1
191 #define IDETAPE_SPACE_TO_EOD 3
193 /* Some defines for the LOAD UNLOAD command */
194 #define IDETAPE_LU_LOAD_MASK 1
195 #define IDETAPE_LU_RETENSION_MASK 2
196 #define IDETAPE_LU_EOT_MASK 4
199 * Special requests for our block device strategy routine.
201 * In order to service a character device command, we add special requests to
202 * the tail of our block device request queue and wait for their completion.
206 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
207 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
208 REQ_IDETAPE_READ = (1 << 2),
209 REQ_IDETAPE_WRITE = (1 << 3),
212 /* Error codes returned in rq->errors to the higher part of the driver. */
213 #define IDETAPE_ERROR_GENERAL 101
214 #define IDETAPE_ERROR_FILEMARK 102
215 #define IDETAPE_ERROR_EOD 103
217 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
218 #define IDETAPE_BLOCK_DESCRIPTOR 0
219 #define IDETAPE_CAPABILITIES_PAGE 0x2a
221 /* Tape flag bits values. */
223 IDETAPE_FLAG_IGNORE_DSC = (1 << 0),
224 /* 0 When the tape position is unknown */
225 IDETAPE_FLAG_ADDRESS_VALID = (1 << 1),
226 /* Device already opened */
227 IDETAPE_FLAG_BUSY = (1 << 2),
228 /* Error detected in a pipeline stage */
229 IDETAPE_FLAG_PIPELINE_ERR = (1 << 3),
230 /* Attempt to auto-detect the current user block size */
231 IDETAPE_FLAG_DETECT_BS = (1 << 4),
232 /* Currently on a filemark */
233 IDETAPE_FLAG_FILEMARK = (1 << 5),
234 /* DRQ interrupt device */
235 IDETAPE_FLAG_DRQ_INTERRUPT = (1 << 6),
236 /* pipeline active */
237 IDETAPE_FLAG_PIPELINE_ACTIVE = (1 << 7),
238 /* 0 = no tape is loaded, so we don't rewind after ejecting */
239 IDETAPE_FLAG_MEDIUM_PRESENT = (1 << 8),
242 /* A pipeline stage. */
243 typedef struct idetape_stage_s {
244 struct request rq; /* The corresponding request */
245 struct idetape_bh *bh; /* The data buffers */
246 struct idetape_stage_s *next; /* Pointer to the next stage */
250 * Most of our global data which we need to save even as we leave the driver due
251 * to an interrupt or a timer event is stored in the struct defined below.
253 typedef struct ide_tape_obj {
255 ide_driver_t *driver;
256 struct gendisk *disk;
260 * Since a typical character device operation requires more
261 * than one packet command, we provide here enough memory
262 * for the maximum of interconnected packet commands.
263 * The packet commands are stored in the circular array pc_stack.
264 * pc_stack_index points to the last used entry, and warps around
265 * to the start when we get to the last array entry.
267 * pc points to the current processed packet command.
269 * failed_pc points to the last failed packet command, or contains
270 * NULL if we do not need to retry any packet command. This is
271 * required since an additional packet command is needed before the
272 * retry, to get detailed information on what went wrong.
274 /* Current packet command */
275 struct ide_atapi_pc *pc;
276 /* Last failed packet command */
277 struct ide_atapi_pc *failed_pc;
278 /* Packet command stack */
279 struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK];
280 /* Next free packet command storage space */
282 struct request rq_stack[IDETAPE_PC_STACK];
283 /* We implement a circular array */
287 * DSC polling variables.
289 * While polling for DSC we use postponed_rq to postpone the current
290 * request so that ide.c will be able to service pending requests on the
291 * other device. Note that at most we will have only one DSC (usually
292 * data transfer) request in the device request queue. Additional
293 * requests can be queued in our internal pipeline, but they will be
294 * visible to ide.c only one at a time.
296 struct request *postponed_rq;
297 /* The time in which we started polling for DSC */
298 unsigned long dsc_polling_start;
299 /* Timer used to poll for dsc */
300 struct timer_list dsc_timer;
301 /* Read/Write dsc polling frequency */
302 unsigned long best_dsc_rw_freq;
303 unsigned long dsc_poll_freq;
304 unsigned long dsc_timeout;
306 /* Read position information */
309 unsigned int first_frame;
311 /* Last error information */
312 u8 sense_key, asc, ascq;
314 /* Character device operation */
318 /* Current character device data transfer direction */
321 /* tape block size, usually 512 or 1024 bytes */
322 unsigned short blk_size;
325 /* Copy of the tape's Capabilities and Mechanical Page */
329 * Active data transfer request parameters.
331 * At most, there is only one ide-tape originated data transfer request
332 * in the device request queue. This allows ide.c to easily service
333 * requests from the other device when we postpone our active request.
334 * In the pipelined operation mode, we use our internal pipeline
335 * structure to hold more data requests. The data buffer size is chosen
336 * based on the tape's recommendation.
338 /* ptr to the request which is waiting in the device request queue */
339 struct request *active_data_rq;
340 /* Data buffer size chosen based on the tape's recommendation */
342 idetape_stage_t *merge_stage;
343 int merge_stage_size;
344 struct idetape_bh *bh;
349 * Pipeline parameters.
351 * To accomplish non-pipelined mode, we simply set the following
352 * variables to zero (or NULL, where appropriate).
354 /* Number of currently used stages */
356 /* Number of pending stages */
357 int nr_pending_stages;
358 /* We will not allocate more than this number of stages */
359 int max_stages, min_pipeline, max_pipeline;
360 /* The first stage which will be removed from the pipeline */
361 idetape_stage_t *first_stage;
362 /* The currently active stage */
363 idetape_stage_t *active_stage;
364 /* Will be serviced after the currently active request */
365 idetape_stage_t *next_stage;
366 /* New requests will be added to the pipeline here */
367 idetape_stage_t *last_stage;
369 /* Wasted space in each stage */
372 /* Status/Action flags: long for set_bit */
374 /* protects the ide-tape queue */
377 /* Measures average tape speed */
378 unsigned long avg_time;
382 /* the door is currently locked */
384 /* the tape hardware is write protected */
386 /* the tape is write protected (hardware or opened as read-only) */
390 * Limit the number of times a request can be postponed, to avoid an
391 * infinite postpone deadlock.
396 * Measures number of frames:
398 * 1. written/read to/from the driver pipeline (pipeline_head).
399 * 2. written/read to/from the tape buffers (idetape_bh).
400 * 3. written/read by the tape to/from the media (tape_head).
407 /* Speed control at the tape buffers input/output */
408 unsigned long insert_time;
411 int max_insert_speed;
412 int measure_insert_time;
414 /* Speed regulation negative feedback loop */
416 int pipeline_head_speed;
417 int controlled_pipeline_head_speed;
418 int uncontrolled_pipeline_head_speed;
419 int controlled_last_pipeline_head;
420 unsigned long uncontrolled_pipeline_head_time;
421 unsigned long controlled_pipeline_head_time;
422 int controlled_previous_pipeline_head;
423 int uncontrolled_previous_pipeline_head;
424 unsigned long controlled_previous_head_time;
425 unsigned long uncontrolled_previous_head_time;
426 int restart_speed_control_req;
431 static DEFINE_MUTEX(idetape_ref_mutex);
433 static struct class *idetape_sysfs_class;
435 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
437 #define ide_tape_g(disk) \
438 container_of((disk)->private_data, struct ide_tape_obj, driver)
440 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
442 struct ide_tape_obj *tape = NULL;
444 mutex_lock(&idetape_ref_mutex);
445 tape = ide_tape_g(disk);
447 kref_get(&tape->kref);
448 mutex_unlock(&idetape_ref_mutex);
452 static void ide_tape_release(struct kref *);
454 static void ide_tape_put(struct ide_tape_obj *tape)
456 mutex_lock(&idetape_ref_mutex);
457 kref_put(&tape->kref, ide_tape_release);
458 mutex_unlock(&idetape_ref_mutex);
462 * The variables below are used for the character device interface. Additional
463 * state variables are defined in our ide_drive_t structure.
465 static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
467 #define ide_tape_f(file) ((file)->private_data)
469 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
471 struct ide_tape_obj *tape = NULL;
473 mutex_lock(&idetape_ref_mutex);
474 tape = idetape_devs[i];
476 kref_get(&tape->kref);
477 mutex_unlock(&idetape_ref_mutex);
481 static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
484 struct idetape_bh *bh = pc->bh;
489 printk(KERN_ERR "ide-tape: bh == NULL in "
490 "idetape_input_buffers\n");
491 ide_atapi_discard_data(drive, bcount);
495 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
497 HWIF(drive)->atapi_input_bytes(drive, bh->b_data +
498 atomic_read(&bh->b_count), count);
500 atomic_add(count, &bh->b_count);
501 if (atomic_read(&bh->b_count) == bh->b_size) {
504 atomic_set(&bh->b_count, 0);
510 static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
513 struct idetape_bh *bh = pc->bh;
518 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
522 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
523 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
526 pc->b_count -= count;
531 pc->b_data = bh->b_data;
532 pc->b_count = atomic_read(&bh->b_count);
538 static void idetape_update_buffers(struct ide_atapi_pc *pc)
540 struct idetape_bh *bh = pc->bh;
542 unsigned int bcount = pc->xferred;
544 if (pc->flags & PC_FLAG_WRITING)
548 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
552 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
553 atomic_set(&bh->b_count, count);
554 if (atomic_read(&bh->b_count) == bh->b_size)
562 * idetape_next_pc_storage returns a pointer to a place in which we can
563 * safely store a packet command, even though we intend to leave the
564 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
565 * commands is allocated at initialization time.
567 static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive)
569 idetape_tape_t *tape = drive->driver_data;
571 debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index);
573 if (tape->pc_stack_index == IDETAPE_PC_STACK)
574 tape->pc_stack_index = 0;
575 return (&tape->pc_stack[tape->pc_stack_index++]);
579 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
580 * Since we queue packet commands in the request queue, we need to
581 * allocate a request, along with the allocation of a packet command.
584 /**************************************************************
586 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
587 * followed later on by kfree(). -ml *
589 **************************************************************/
591 static struct request *idetape_next_rq_storage(ide_drive_t *drive)
593 idetape_tape_t *tape = drive->driver_data;
595 debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index);
597 if (tape->rq_stack_index == IDETAPE_PC_STACK)
598 tape->rq_stack_index = 0;
599 return (&tape->rq_stack[tape->rq_stack_index++]);
602 static void idetape_init_pc(struct ide_atapi_pc *pc)
604 memset(pc->c, 0, 12);
608 pc->buf = pc->pc_buf;
609 pc->buf_size = IDETAPE_PC_BUFFER_SIZE;
615 * called on each failed packet command retry to analyze the request sense. We
616 * currently do not utilize this information.
618 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
620 idetape_tape_t *tape = drive->driver_data;
621 struct ide_atapi_pc *pc = tape->failed_pc;
623 tape->sense_key = sense[2] & 0xF;
624 tape->asc = sense[12];
625 tape->ascq = sense[13];
627 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
628 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
630 /* Correct pc->xferred by asking the tape. */
631 if (pc->flags & PC_FLAG_DMA_ERROR) {
632 pc->xferred = pc->req_xfer -
634 be32_to_cpu(get_unaligned((u32 *)&sense[3]));
635 idetape_update_buffers(pc);
639 * If error was the result of a zero-length read or write command,
640 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
641 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
643 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
645 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
646 if (tape->sense_key == 5) {
647 /* don't report an error, everything's ok */
649 /* don't retry read/write */
650 pc->flags |= PC_FLAG_ABORT;
653 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
654 pc->error = IDETAPE_ERROR_FILEMARK;
655 pc->flags |= PC_FLAG_ABORT;
657 if (pc->c[0] == WRITE_6) {
658 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
659 && tape->asc == 0x0 && tape->ascq == 0x2)) {
660 pc->error = IDETAPE_ERROR_EOD;
661 pc->flags |= PC_FLAG_ABORT;
664 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
665 if (tape->sense_key == 8) {
666 pc->error = IDETAPE_ERROR_EOD;
667 pc->flags |= PC_FLAG_ABORT;
669 if (!(pc->flags & PC_FLAG_ABORT) &&
671 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
675 static void idetape_activate_next_stage(ide_drive_t *drive)
677 idetape_tape_t *tape = drive->driver_data;
678 idetape_stage_t *stage = tape->next_stage;
679 struct request *rq = &stage->rq;
681 debug_log(DBG_PROCS, "Enter %s\n", __func__);
684 printk(KERN_ERR "ide-tape: bug: Trying to activate a non"
685 " existing stage\n");
689 rq->rq_disk = tape->disk;
691 rq->special = (void *)stage->bh;
692 tape->active_data_rq = rq;
693 tape->active_stage = stage;
694 tape->next_stage = stage->next;
697 /* Free a stage along with its related buffers completely. */
698 static void __idetape_kfree_stage(idetape_stage_t *stage)
700 struct idetape_bh *prev_bh, *bh = stage->bh;
704 if (bh->b_data != NULL) {
705 size = (int) bh->b_size;
707 free_page((unsigned long) bh->b_data);
709 bh->b_data += PAGE_SIZE;
719 static void idetape_kfree_stage(idetape_tape_t *tape, idetape_stage_t *stage)
721 __idetape_kfree_stage(stage);
725 * Remove tape->first_stage from the pipeline. The caller should avoid race
728 static void idetape_remove_stage_head(ide_drive_t *drive)
730 idetape_tape_t *tape = drive->driver_data;
731 idetape_stage_t *stage;
733 debug_log(DBG_PROCS, "Enter %s\n", __func__);
735 if (tape->first_stage == NULL) {
736 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
739 if (tape->active_stage == tape->first_stage) {
740 printk(KERN_ERR "ide-tape: bug: Trying to free our active "
744 stage = tape->first_stage;
745 tape->first_stage = stage->next;
746 idetape_kfree_stage(tape, stage);
748 if (tape->first_stage == NULL) {
749 tape->last_stage = NULL;
750 if (tape->next_stage != NULL)
751 printk(KERN_ERR "ide-tape: bug: tape->next_stage !="
754 printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 "
760 * This will free all the pipeline stages starting from new_last_stage->next
761 * to the end of the list, and point tape->last_stage to new_last_stage.
763 static void idetape_abort_pipeline(ide_drive_t *drive,
764 idetape_stage_t *new_last_stage)
766 idetape_tape_t *tape = drive->driver_data;
767 idetape_stage_t *stage = new_last_stage->next;
768 idetape_stage_t *nstage;
770 debug_log(DBG_PROCS, "%s: Enter %s\n", tape->name, __func__);
773 nstage = stage->next;
774 idetape_kfree_stage(tape, stage);
776 --tape->nr_pending_stages;
780 new_last_stage->next = NULL;
781 tape->last_stage = new_last_stage;
782 tape->next_stage = NULL;
786 * Finish servicing a request and insert a pending pipeline request into the
789 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
791 struct request *rq = HWGROUP(drive)->rq;
792 idetape_tape_t *tape = drive->driver_data;
795 int remove_stage = 0;
796 idetape_stage_t *active_stage;
798 debug_log(DBG_PROCS, "Enter %s\n", __func__);
801 case 0: error = IDETAPE_ERROR_GENERAL; break;
802 case 1: error = 0; break;
803 default: error = uptodate;
807 tape->failed_pc = NULL;
809 if (!blk_special_request(rq)) {
810 ide_end_request(drive, uptodate, nr_sects);
814 spin_lock_irqsave(&tape->lock, flags);
816 /* The request was a pipelined data transfer request */
817 if (tape->active_data_rq == rq) {
818 active_stage = tape->active_stage;
819 tape->active_stage = NULL;
820 tape->active_data_rq = NULL;
821 tape->nr_pending_stages--;
822 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
825 set_bit(IDETAPE_FLAG_PIPELINE_ERR,
827 if (error == IDETAPE_ERROR_EOD)
828 idetape_abort_pipeline(drive,
831 } else if (rq->cmd[0] & REQ_IDETAPE_READ) {
832 if (error == IDETAPE_ERROR_EOD) {
833 set_bit(IDETAPE_FLAG_PIPELINE_ERR,
835 idetape_abort_pipeline(drive, active_stage);
838 if (tape->next_stage != NULL) {
839 idetape_activate_next_stage(drive);
841 /* Insert the next request into the request queue. */
842 (void)ide_do_drive_cmd(drive, tape->active_data_rq,
846 * This is a part of the feedback loop which tries to
847 * find the optimum number of stages. We are starting
848 * from a minimum maximum number of stages, and if we
849 * sense that the pipeline is empty, we try to increase
850 * it, until we reach the user compile time memory
853 int i = (tape->max_pipeline - tape->min_pipeline) / 10;
855 tape->max_stages += max(i, 1);
856 tape->max_stages = max(tape->max_stages,
858 tape->max_stages = min(tape->max_stages,
862 ide_end_drive_cmd(drive, 0, 0);
865 idetape_remove_stage_head(drive);
866 if (tape->active_data_rq == NULL)
867 clear_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags);
868 spin_unlock_irqrestore(&tape->lock, flags);
872 static ide_startstop_t idetape_request_sense_callback(ide_drive_t *drive)
874 idetape_tape_t *tape = drive->driver_data;
876 debug_log(DBG_PROCS, "Enter %s\n", __func__);
878 if (!tape->pc->error) {
879 idetape_analyze_error(drive, tape->pc->buf);
880 idetape_end_request(drive, 1, 0);
882 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - "
883 "Aborting request!\n");
884 idetape_end_request(drive, 0, 0);
889 static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc)
892 pc->c[0] = REQUEST_SENSE;
895 pc->idetape_callback = &idetape_request_sense_callback;
898 static void idetape_init_rq(struct request *rq, u8 cmd)
900 memset(rq, 0, sizeof(*rq));
901 rq->cmd_type = REQ_TYPE_SPECIAL;
906 * Generate a new packet command request in front of the request queue, before
907 * the current request, so that it will be processed immediately, on the next
908 * pass through the driver. The function below is called from the request
909 * handling part of the driver (the "bottom" part). Safe storage for the request
910 * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that.
912 * Memory for those requests is pre-allocated at initialization time, and is
913 * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for
914 * the maximum possible number of inter-dependent packet commands.
916 * The higher level of the driver - The ioctl handler and the character device
917 * handling functions should queue request to the lower level part and wait for
918 * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail.
920 static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc,
923 struct ide_tape_obj *tape = drive->driver_data;
925 idetape_init_rq(rq, REQ_IDETAPE_PC1);
926 rq->buffer = (char *) pc;
927 rq->rq_disk = tape->disk;
928 (void) ide_do_drive_cmd(drive, rq, ide_preempt);
932 * idetape_retry_pc is called when an error was detected during the
933 * last packet command. We queue a request sense packet command in
934 * the head of the request list.
936 static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
938 idetape_tape_t *tape = drive->driver_data;
939 struct ide_atapi_pc *pc;
942 (void)ide_read_error(drive);
943 pc = idetape_next_pc_storage(drive);
944 rq = idetape_next_rq_storage(drive);
945 idetape_create_request_sense_cmd(pc);
946 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
947 idetape_queue_pc_head(drive, pc, rq);
952 * Postpone the current request so that ide.c will be able to service requests
953 * from another device on the same hwgroup while we are polling for DSC.
955 static void idetape_postpone_request(ide_drive_t *drive)
957 idetape_tape_t *tape = drive->driver_data;
959 debug_log(DBG_PROCS, "Enter %s\n", __func__);
961 tape->postponed_rq = HWGROUP(drive)->rq;
962 ide_stall_queue(drive, tape->dsc_poll_freq);
965 typedef void idetape_io_buf(ide_drive_t *, struct ide_atapi_pc *, unsigned int);
968 * This is the usual interrupt handler which will be called during a packet
969 * command. We will transfer some of the data (as requested by the drive) and
970 * will re-point interrupt handler to us. When data transfer is finished, we
971 * will act according to the algorithm described before
974 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
976 ide_hwif_t *hwif = drive->hwif;
977 idetape_tape_t *tape = drive->driver_data;
978 struct ide_atapi_pc *pc = tape->pc;
979 xfer_func_t *xferfunc;
980 idetape_io_buf *iobuf;
983 static int error_sim_count;
988 debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__);
990 /* Clear the interrupt */
991 stat = ide_read_status(drive);
993 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
994 if (hwif->dma_ops->dma_end(drive) || (stat & ERR_STAT)) {
996 * A DMA error is sometimes expected. For example,
997 * if the tape is crossing a filemark during a
998 * READ command, it will issue an irq and position
999 * itself before the filemark, so that only a partial
1000 * data transfer will occur (which causes the DMA
1001 * error). In that case, we will later ask the tape
1002 * how much bytes of the original request were
1003 * actually transferred (we can't receive that
1004 * information from the DMA engine on most chipsets).
1008 * On the contrary, a DMA error is never expected;
1009 * it usually indicates a hardware error or abort.
1010 * If the tape crosses a filemark during a READ
1011 * command, it will issue an irq and position itself
1012 * after the filemark (not before). Only a partial
1013 * data transfer will occur, but no DMA error.
1016 pc->flags |= PC_FLAG_DMA_ERROR;
1018 pc->xferred = pc->req_xfer;
1019 idetape_update_buffers(pc);
1021 debug_log(DBG_PROCS, "DMA finished\n");
1025 /* No more interrupts */
1026 if ((stat & DRQ_STAT) == 0) {
1027 debug_log(DBG_SENSE, "Packet command completed, %d bytes"
1028 " transferred\n", pc->xferred);
1030 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
1034 if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) &&
1035 (++error_sim_count % 100) == 0) {
1036 printk(KERN_INFO "ide-tape: %s: simulating error\n",
1041 if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
1043 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
1044 /* Error detected */
1045 debug_log(DBG_ERR, "%s: I/O error\n", tape->name);
1047 if (pc->c[0] == REQUEST_SENSE) {
1048 printk(KERN_ERR "ide-tape: I/O error in request"
1049 " sense command\n");
1050 return ide_do_reset(drive);
1052 debug_log(DBG_ERR, "[cmd %x]: check condition\n",
1055 /* Retry operation */
1056 return idetape_retry_pc(drive);
1059 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
1060 (stat & SEEK_STAT) == 0) {
1061 /* Media access command */
1062 tape->dsc_polling_start = jiffies;
1063 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
1064 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
1065 /* Allow ide.c to handle other requests */
1066 idetape_postpone_request(drive);
1069 if (tape->failed_pc == pc)
1070 tape->failed_pc = NULL;
1071 /* Command finished - Call the callback function */
1072 return pc->idetape_callback(drive);
1075 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
1076 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
1077 printk(KERN_ERR "ide-tape: The tape wants to issue more "
1078 "interrupts in DMA mode\n");
1079 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
1081 return ide_do_reset(drive);
1083 /* Get the number of bytes to transfer on this interrupt. */
1084 bcount = (hwif->INB(hwif->io_ports[IDE_BCOUNTH_OFFSET]) << 8) |
1085 hwif->INB(hwif->io_ports[IDE_BCOUNTL_OFFSET]);
1087 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
1090 printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__);
1091 return ide_do_reset(drive);
1093 if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
1094 /* Hopefully, we will never get here */
1095 printk(KERN_ERR "ide-tape: We wanted to %s, ",
1096 (ireason & IO) ? "Write" : "Read");
1097 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
1098 (ireason & IO) ? "Read" : "Write");
1099 return ide_do_reset(drive);
1101 if (!(pc->flags & PC_FLAG_WRITING)) {
1102 /* Reading - Check that we have enough space */
1103 temp = pc->xferred + bcount;
1104 if (temp > pc->req_xfer) {
1105 if (temp > pc->buf_size) {
1106 printk(KERN_ERR "ide-tape: The tape wants to "
1107 "send us more data than expected "
1108 "- discarding data\n");
1109 ide_atapi_discard_data(drive, bcount);
1110 ide_set_handler(drive, &idetape_pc_intr,
1111 IDETAPE_WAIT_CMD, NULL);
1114 debug_log(DBG_SENSE, "The tape wants to send us more "
1115 "data than expected - allowing transfer\n");
1117 iobuf = &idetape_input_buffers;
1118 xferfunc = hwif->atapi_input_bytes;
1120 iobuf = &idetape_output_buffers;
1121 xferfunc = hwif->atapi_output_bytes;
1125 iobuf(drive, pc, bcount);
1127 xferfunc(drive, pc->cur_pos, bcount);
1129 /* Update the current position */
1130 pc->xferred += bcount;
1131 pc->cur_pos += bcount;
1133 debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n",
1136 /* And set the interrupt handler again */
1137 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1142 * Packet Command Interface
1144 * The current Packet Command is available in tape->pc, and will not change
1145 * until we finish handling it. Each packet command is associated with a
1146 * callback function that will be called when the command is finished.
1148 * The handling will be done in three stages:
1150 * 1. idetape_issue_pc will send the packet command to the drive, and will set
1151 * the interrupt handler to idetape_pc_intr.
1153 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
1154 * repeated until the device signals us that no more interrupts will be issued.
1156 * 3. ATAPI Tape media access commands have immediate status with a delayed
1157 * process. In case of a successful initiation of a media access packet command,
1158 * the DSC bit will be set when the actual execution of the command is finished.
1159 * Since the tape drive will not issue an interrupt, we have to poll for this
1160 * event. In this case, we define the request as "low priority request" by
1161 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
1164 * ide.c will then give higher priority to requests which originate from the
1165 * other device, until will change rq_status to RQ_ACTIVE.
1167 * 4. When the packet command is finished, it will be checked for errors.
1169 * 5. In case an error was found, we queue a request sense packet command in
1170 * front of the request queue and retry the operation up to
1171 * IDETAPE_MAX_PC_RETRIES times.
1173 * 6. In case no error was found, or we decided to give up and not to retry
1174 * again, the callback function will be called and then we will handle the next
1177 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
1179 ide_hwif_t *hwif = drive->hwif;
1180 idetape_tape_t *tape = drive->driver_data;
1181 struct ide_atapi_pc *pc = tape->pc;
1183 ide_startstop_t startstop;
1186 if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
1187 printk(KERN_ERR "ide-tape: Strange, packet command initiated "
1188 "yet DRQ isn't asserted\n");
1191 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
1192 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
1193 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
1194 "a packet command, retrying\n");
1196 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
1198 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
1199 "issuing a packet command, ignoring\n");
1204 if ((ireason & CD) == 0 || (ireason & IO)) {
1205 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
1206 "a packet command\n");
1207 return ide_do_reset(drive);
1209 /* Set the interrupt routine */
1210 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1211 #ifdef CONFIG_BLK_DEV_IDEDMA
1212 /* Begin DMA, if necessary */
1213 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS)
1214 hwif->dma_ops->dma_start(drive);
1216 /* Send the actual packet */
1217 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
1221 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
1222 struct ide_atapi_pc *pc)
1224 ide_hwif_t *hwif = drive->hwif;
1225 idetape_tape_t *tape = drive->driver_data;
1229 if (tape->pc->c[0] == REQUEST_SENSE &&
1230 pc->c[0] == REQUEST_SENSE) {
1231 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
1232 "Two request sense in serial were issued\n");
1235 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
1236 tape->failed_pc = pc;
1237 /* Set the current packet command */
1240 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
1241 (pc->flags & PC_FLAG_ABORT)) {
1243 * We will "abort" retrying a packet command in case legitimate
1244 * error code was received (crossing a filemark, or end of the
1245 * media, for example).
1247 if (!(pc->flags & PC_FLAG_ABORT)) {
1248 if (!(pc->c[0] == TEST_UNIT_READY &&
1249 tape->sense_key == 2 && tape->asc == 4 &&
1250 (tape->ascq == 1 || tape->ascq == 8))) {
1251 printk(KERN_ERR "ide-tape: %s: I/O error, "
1252 "pc = %2x, key = %2x, "
1253 "asc = %2x, ascq = %2x\n",
1254 tape->name, pc->c[0],
1255 tape->sense_key, tape->asc,
1259 pc->error = IDETAPE_ERROR_GENERAL;
1261 tape->failed_pc = NULL;
1262 return pc->idetape_callback(drive);
1264 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
1267 /* We haven't transferred any data yet */
1269 pc->cur_pos = pc->buf;
1270 /* Request to transfer the entire buffer at once */
1271 bcount = pc->req_xfer;
1273 if (pc->flags & PC_FLAG_DMA_ERROR) {
1274 pc->flags &= ~PC_FLAG_DMA_ERROR;
1275 printk(KERN_WARNING "ide-tape: DMA disabled, "
1276 "reverting to PIO\n");
1279 if ((pc->flags & PC_FLAG_DMA_RECOMMENDED) && drive->using_dma)
1280 dma_ok = !hwif->dma_ops->dma_setup(drive);
1282 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
1283 IDE_TFLAG_OUT_DEVICE, bcount, dma_ok);
1286 /* Will begin DMA later */
1287 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
1288 if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags)) {
1289 ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc,
1290 IDETAPE_WAIT_CMD, NULL);
1293 hwif->OUTB(WIN_PACKETCMD, hwif->io_ports[IDE_COMMAND_OFFSET]);
1294 return idetape_transfer_pc(drive);
1298 static ide_startstop_t idetape_pc_callback(ide_drive_t *drive)
1300 idetape_tape_t *tape = drive->driver_data;
1302 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1304 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
1308 /* A mode sense command is used to "sense" tape parameters. */
1309 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
1311 idetape_init_pc(pc);
1312 pc->c[0] = MODE_SENSE;
1313 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
1314 /* DBD = 1 - Don't return block descriptors */
1316 pc->c[2] = page_code;
1318 * Changed pc->c[3] to 0 (255 will at best return unused info).
1320 * For SCSI this byte is defined as subpage instead of high byte
1321 * of length and some IDE drives seem to interpret it this way
1322 * and return an error when 255 is used.
1325 /* We will just discard data in that case */
1327 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
1329 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
1333 pc->idetape_callback = &idetape_pc_callback;
1336 static void idetape_calculate_speeds(ide_drive_t *drive)
1338 idetape_tape_t *tape = drive->driver_data;
1340 if (time_after(jiffies,
1341 tape->controlled_pipeline_head_time + 120 * HZ)) {
1342 tape->controlled_previous_pipeline_head =
1343 tape->controlled_last_pipeline_head;
1344 tape->controlled_previous_head_time =
1345 tape->controlled_pipeline_head_time;
1346 tape->controlled_last_pipeline_head = tape->pipeline_head;
1347 tape->controlled_pipeline_head_time = jiffies;
1349 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
1350 tape->controlled_pipeline_head_speed = (tape->pipeline_head -
1351 tape->controlled_last_pipeline_head) * 32 * HZ /
1352 (jiffies - tape->controlled_pipeline_head_time);
1353 else if (time_after(jiffies, tape->controlled_previous_head_time))
1354 tape->controlled_pipeline_head_speed = (tape->pipeline_head -
1355 tape->controlled_previous_pipeline_head) * 32 *
1356 HZ / (jiffies - tape->controlled_previous_head_time);
1358 if (tape->nr_pending_stages < tape->max_stages/*- 1 */) {
1359 /* -1 for read mode error recovery */
1360 if (time_after(jiffies, tape->uncontrolled_previous_head_time +
1362 tape->uncontrolled_pipeline_head_time = jiffies;
1363 tape->uncontrolled_pipeline_head_speed =
1364 (tape->pipeline_head -
1365 tape->uncontrolled_previous_pipeline_head) *
1366 32 * HZ / (jiffies -
1367 tape->uncontrolled_previous_head_time);
1370 tape->uncontrolled_previous_head_time = jiffies;
1371 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
1372 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time +
1374 tape->uncontrolled_pipeline_head_time = jiffies;
1377 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed,
1378 tape->controlled_pipeline_head_speed);
1380 if (tape->speed_control == 1) {
1381 if (tape->nr_pending_stages >= tape->max_stages / 2)
1382 tape->max_insert_speed = tape->pipeline_head_speed +
1383 (1100 - tape->pipeline_head_speed) * 2 *
1384 (tape->nr_pending_stages - tape->max_stages / 2)
1387 tape->max_insert_speed = 500 +
1388 (tape->pipeline_head_speed - 500) * 2 *
1389 tape->nr_pending_stages / tape->max_stages;
1391 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
1392 tape->max_insert_speed = 5000;
1394 tape->max_insert_speed = tape->speed_control;
1396 tape->max_insert_speed = max(tape->max_insert_speed, 500);
1399 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
1401 idetape_tape_t *tape = drive->driver_data;
1402 struct ide_atapi_pc *pc = tape->pc;
1405 stat = ide_read_status(drive);
1407 if (stat & SEEK_STAT) {
1408 if (stat & ERR_STAT) {
1409 /* Error detected */
1410 if (pc->c[0] != TEST_UNIT_READY)
1411 printk(KERN_ERR "ide-tape: %s: I/O error, ",
1413 /* Retry operation */
1414 return idetape_retry_pc(drive);
1417 if (tape->failed_pc == pc)
1418 tape->failed_pc = NULL;
1420 pc->error = IDETAPE_ERROR_GENERAL;
1421 tape->failed_pc = NULL;
1423 return pc->idetape_callback(drive);
1426 static ide_startstop_t idetape_rw_callback(ide_drive_t *drive)
1428 idetape_tape_t *tape = drive->driver_data;
1429 struct request *rq = HWGROUP(drive)->rq;
1430 int blocks = tape->pc->xferred / tape->blk_size;
1432 tape->avg_size += blocks * tape->blk_size;
1433 tape->insert_size += blocks * tape->blk_size;
1434 if (tape->insert_size > 1024 * 1024)
1435 tape->measure_insert_time = 1;
1436 if (tape->measure_insert_time) {
1437 tape->measure_insert_time = 0;
1438 tape->insert_time = jiffies;
1439 tape->insert_size = 0;
1441 if (time_after(jiffies, tape->insert_time))
1442 tape->insert_speed = tape->insert_size / 1024 * HZ /
1443 (jiffies - tape->insert_time);
1444 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
1445 tape->avg_speed = tape->avg_size * HZ /
1446 (jiffies - tape->avg_time) / 1024;
1448 tape->avg_time = jiffies;
1450 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1452 tape->first_frame += blocks;
1453 rq->current_nr_sectors -= blocks;
1455 if (!tape->pc->error)
1456 idetape_end_request(drive, 1, 0);
1458 idetape_end_request(drive, tape->pc->error, 0);
1462 static void idetape_create_read_cmd(idetape_tape_t *tape,
1463 struct ide_atapi_pc *pc,
1464 unsigned int length, struct idetape_bh *bh)
1466 idetape_init_pc(pc);
1468 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
1470 pc->idetape_callback = &idetape_rw_callback;
1472 atomic_set(&bh->b_count, 0);
1474 pc->buf_size = length * tape->blk_size;
1475 pc->req_xfer = pc->buf_size;
1476 if (pc->req_xfer == tape->stage_size)
1477 pc->flags |= PC_FLAG_DMA_RECOMMENDED;
1480 static void idetape_create_write_cmd(idetape_tape_t *tape,
1481 struct ide_atapi_pc *pc,
1482 unsigned int length, struct idetape_bh *bh)
1484 idetape_init_pc(pc);
1486 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
1488 pc->idetape_callback = &idetape_rw_callback;
1489 pc->flags |= PC_FLAG_WRITING;
1491 pc->b_data = bh->b_data;
1492 pc->b_count = atomic_read(&bh->b_count);
1494 pc->buf_size = length * tape->blk_size;
1495 pc->req_xfer = pc->buf_size;
1496 if (pc->req_xfer == tape->stage_size)
1497 pc->flags |= PC_FLAG_DMA_RECOMMENDED;
1500 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
1501 struct request *rq, sector_t block)
1503 idetape_tape_t *tape = drive->driver_data;
1504 struct ide_atapi_pc *pc = NULL;
1505 struct request *postponed_rq = tape->postponed_rq;
1508 debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld,"
1509 " current_nr_sectors: %d\n",
1510 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
1512 if (!blk_special_request(rq)) {
1513 /* We do not support buffer cache originated requests. */
1514 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
1515 "request queue (%d)\n", drive->name, rq->cmd_type);
1516 ide_end_request(drive, 0, 0);
1520 /* Retry a failed packet command */
1521 if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE)
1522 return idetape_issue_pc(drive, tape->failed_pc);
1524 if (postponed_rq != NULL)
1525 if (rq != postponed_rq) {
1526 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
1527 "Two DSC requests were queued\n");
1528 idetape_end_request(drive, 0, 0);
1532 tape->postponed_rq = NULL;
1535 * If the tape is still busy, postpone our request and service
1536 * the other device meanwhile.
1538 stat = ide_read_status(drive);
1540 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
1541 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
1543 if (drive->post_reset == 1) {
1544 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
1545 drive->post_reset = 0;
1548 if (time_after(jiffies, tape->insert_time))
1549 tape->insert_speed = tape->insert_size / 1024 * HZ /
1550 (jiffies - tape->insert_time);
1551 idetape_calculate_speeds(drive);
1552 if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) &&
1553 (stat & SEEK_STAT) == 0) {
1554 if (postponed_rq == NULL) {
1555 tape->dsc_polling_start = jiffies;
1556 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
1557 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
1558 } else if (time_after(jiffies, tape->dsc_timeout)) {
1559 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
1561 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1562 idetape_media_access_finished(drive);
1565 return ide_do_reset(drive);
1567 } else if (time_after(jiffies,
1568 tape->dsc_polling_start +
1569 IDETAPE_DSC_MA_THRESHOLD))
1570 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
1571 idetape_postpone_request(drive);
1574 if (rq->cmd[0] & REQ_IDETAPE_READ) {
1575 tape->buffer_head++;
1576 tape->postpone_cnt = 0;
1577 pc = idetape_next_pc_storage(drive);
1578 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors,
1579 (struct idetape_bh *)rq->special);
1582 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
1583 tape->buffer_head++;
1584 tape->postpone_cnt = 0;
1585 pc = idetape_next_pc_storage(drive);
1586 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors,
1587 (struct idetape_bh *)rq->special);
1590 if (rq->cmd[0] & REQ_IDETAPE_PC1) {
1591 pc = (struct ide_atapi_pc *) rq->buffer;
1592 rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
1593 rq->cmd[0] |= REQ_IDETAPE_PC2;
1596 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1597 idetape_media_access_finished(drive);
1602 return idetape_issue_pc(drive, pc);
1605 /* Pipeline related functions */
1608 * The function below uses __get_free_page to allocate a pipeline stage, along
1609 * with all the necessary small buffers which together make a buffer of size
1610 * tape->stage_size (or a bit more). We attempt to combine sequential pages as
1613 * It returns a pointer to the new allocated stage, or NULL if we can't (or
1614 * don't want to) allocate a stage.
1616 * Pipeline stages are optional and are used to increase performance. If we
1617 * can't allocate them, we'll manage without them.
1619 static idetape_stage_t *__idetape_kmalloc_stage(idetape_tape_t *tape, int full,
1622 idetape_stage_t *stage;
1623 struct idetape_bh *prev_bh, *bh;
1624 int pages = tape->pages_per_stage;
1625 char *b_data = NULL;
1627 stage = kmalloc(sizeof(idetape_stage_t), GFP_KERNEL);
1632 stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1636 bh->b_reqnext = NULL;
1637 bh->b_data = (char *) __get_free_page(GFP_KERNEL);
1641 memset(bh->b_data, 0, PAGE_SIZE);
1642 bh->b_size = PAGE_SIZE;
1643 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1646 b_data = (char *) __get_free_page(GFP_KERNEL);
1650 memset(b_data, 0, PAGE_SIZE);
1651 if (bh->b_data == b_data + PAGE_SIZE) {
1652 bh->b_size += PAGE_SIZE;
1653 bh->b_data -= PAGE_SIZE;
1655 atomic_add(PAGE_SIZE, &bh->b_count);
1658 if (b_data == bh->b_data + bh->b_size) {
1659 bh->b_size += PAGE_SIZE;
1661 atomic_add(PAGE_SIZE, &bh->b_count);
1665 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1667 free_page((unsigned long) b_data);
1670 bh->b_reqnext = NULL;
1671 bh->b_data = b_data;
1672 bh->b_size = PAGE_SIZE;
1673 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1674 prev_bh->b_reqnext = bh;
1676 bh->b_size -= tape->excess_bh_size;
1678 atomic_sub(tape->excess_bh_size, &bh->b_count);
1681 __idetape_kfree_stage(stage);
1685 static idetape_stage_t *idetape_kmalloc_stage(idetape_tape_t *tape)
1687 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1689 if (tape->nr_stages >= tape->max_stages)
1691 return __idetape_kmalloc_stage(tape, 0, 0);
1694 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
1695 idetape_stage_t *stage, const char __user *buf, int n)
1697 struct idetape_bh *bh = tape->bh;
1703 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1707 count = min((unsigned int)
1708 (bh->b_size - atomic_read(&bh->b_count)),
1710 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
1714 atomic_add(count, &bh->b_count);
1716 if (atomic_read(&bh->b_count) == bh->b_size) {
1719 atomic_set(&bh->b_count, 0);
1726 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
1727 idetape_stage_t *stage, int n)
1729 struct idetape_bh *bh = tape->bh;
1735 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1739 count = min(tape->b_count, n);
1740 if (copy_to_user(buf, tape->b_data, count))
1743 tape->b_data += count;
1744 tape->b_count -= count;
1746 if (!tape->b_count) {
1750 tape->b_data = bh->b_data;
1751 tape->b_count = atomic_read(&bh->b_count);
1758 static void idetape_init_merge_stage(idetape_tape_t *tape)
1760 struct idetape_bh *bh = tape->merge_stage->bh;
1763 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1764 atomic_set(&bh->b_count, 0);
1766 tape->b_data = bh->b_data;
1767 tape->b_count = atomic_read(&bh->b_count);
1771 static void idetape_switch_buffers(idetape_tape_t *tape, idetape_stage_t *stage)
1773 struct idetape_bh *tmp;
1776 stage->bh = tape->merge_stage->bh;
1777 tape->merge_stage->bh = tmp;
1778 idetape_init_merge_stage(tape);
1781 /* Add a new stage at the end of the pipeline. */
1782 static void idetape_add_stage_tail(ide_drive_t *drive, idetape_stage_t *stage)
1784 idetape_tape_t *tape = drive->driver_data;
1785 unsigned long flags;
1787 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1789 spin_lock_irqsave(&tape->lock, flags);
1791 if (tape->last_stage != NULL)
1792 tape->last_stage->next = stage;
1794 tape->first_stage = stage;
1795 tape->next_stage = stage;
1796 tape->last_stage = stage;
1797 if (tape->next_stage == NULL)
1798 tape->next_stage = tape->last_stage;
1800 tape->nr_pending_stages++;
1801 spin_unlock_irqrestore(&tape->lock, flags);
1804 /* Install a completion in a pending request and sleep until it is serviced. The
1805 * caller should ensure that the request will not be serviced before we install
1806 * the completion (usually by disabling interrupts).
1808 static void idetape_wait_for_request(ide_drive_t *drive, struct request *rq)
1810 DECLARE_COMPLETION_ONSTACK(wait);
1811 idetape_tape_t *tape = drive->driver_data;
1813 if (rq == NULL || !blk_special_request(rq)) {
1814 printk(KERN_ERR "ide-tape: bug: Trying to sleep on non-valid"
1818 rq->end_io_data = &wait;
1819 rq->end_io = blk_end_sync_rq;
1820 spin_unlock_irq(&tape->lock);
1821 wait_for_completion(&wait);
1822 /* The stage and its struct request have been deallocated */
1823 spin_lock_irq(&tape->lock);
1826 static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive)
1828 idetape_tape_t *tape = drive->driver_data;
1829 u8 *readpos = tape->pc->buf;
1831 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1833 if (!tape->pc->error) {
1834 debug_log(DBG_SENSE, "BOP - %s\n",
1835 (readpos[0] & 0x80) ? "Yes" : "No");
1836 debug_log(DBG_SENSE, "EOP - %s\n",
1837 (readpos[0] & 0x40) ? "Yes" : "No");
1839 if (readpos[0] & 0x4) {
1840 printk(KERN_INFO "ide-tape: Block location is unknown"
1842 clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags);
1843 idetape_end_request(drive, 0, 0);
1845 debug_log(DBG_SENSE, "Block Location - %u\n",
1846 be32_to_cpu(*(u32 *)&readpos[4]));
1848 tape->partition = readpos[1];
1850 be32_to_cpu(*(u32 *)&readpos[4]);
1851 set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags);
1852 idetape_end_request(drive, 1, 0);
1855 idetape_end_request(drive, 0, 0);
1861 * Write a filemark if write_filemark=1. Flush the device buffers without
1862 * writing a filemark otherwise.
1864 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1865 struct ide_atapi_pc *pc, int write_filemark)
1867 idetape_init_pc(pc);
1868 pc->c[0] = WRITE_FILEMARKS;
1869 pc->c[4] = write_filemark;
1870 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1871 pc->idetape_callback = &idetape_pc_callback;
1874 static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc)
1876 idetape_init_pc(pc);
1877 pc->c[0] = TEST_UNIT_READY;
1878 pc->idetape_callback = &idetape_pc_callback;
1882 * We add a special packet command request to the tail of the request queue, and
1883 * wait for it to be serviced. This is not to be called from within the request
1884 * handling part of the driver! We allocate here data on the stack and it is
1885 * valid until the request is finished. This is not the case for the bottom part
1886 * of the driver, where we are always leaving the functions to wait for an
1887 * interrupt or a timer event.
1889 * From the bottom part of the driver, we should allocate safe memory using
1890 * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request
1891 * to the request list without waiting for it to be serviced! In that case, we
1892 * usually use idetape_queue_pc_head().
1894 static int __idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
1896 struct ide_tape_obj *tape = drive->driver_data;
1899 idetape_init_rq(&rq, REQ_IDETAPE_PC1);
1900 rq.buffer = (char *) pc;
1901 rq.rq_disk = tape->disk;
1902 return ide_do_drive_cmd(drive, &rq, ide_wait);
1905 static void idetape_create_load_unload_cmd(ide_drive_t *drive,
1906 struct ide_atapi_pc *pc, int cmd)
1908 idetape_init_pc(pc);
1909 pc->c[0] = START_STOP;
1911 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1912 pc->idetape_callback = &idetape_pc_callback;
1915 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1917 idetape_tape_t *tape = drive->driver_data;
1918 struct ide_atapi_pc pc;
1919 int load_attempted = 0;
1921 /* Wait for the tape to become ready */
1922 set_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags);
1924 while (time_before(jiffies, timeout)) {
1925 idetape_create_test_unit_ready_cmd(&pc);
1926 if (!__idetape_queue_pc_tail(drive, &pc))
1928 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1929 || (tape->asc == 0x3A)) {
1933 idetape_create_load_unload_cmd(drive, &pc,
1934 IDETAPE_LU_LOAD_MASK);
1935 __idetape_queue_pc_tail(drive, &pc);
1937 /* not about to be ready */
1938 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1939 (tape->ascq == 1 || tape->ascq == 8)))
1946 static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
1948 return __idetape_queue_pc_tail(drive, pc);
1951 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1953 struct ide_atapi_pc pc;
1956 idetape_create_write_filemark_cmd(drive, &pc, 0);
1957 rc = idetape_queue_pc_tail(drive, &pc);
1960 idetape_wait_ready(drive, 60 * 5 * HZ);
1964 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1966 idetape_init_pc(pc);
1967 pc->c[0] = READ_POSITION;
1969 pc->idetape_callback = &idetape_read_position_callback;
1972 static int idetape_read_position(ide_drive_t *drive)
1974 idetape_tape_t *tape = drive->driver_data;
1975 struct ide_atapi_pc pc;
1978 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1980 idetape_create_read_position_cmd(&pc);
1981 if (idetape_queue_pc_tail(drive, &pc))
1983 position = tape->first_frame;
1987 static void idetape_create_locate_cmd(ide_drive_t *drive,
1988 struct ide_atapi_pc *pc,
1989 unsigned int block, u8 partition, int skip)
1991 idetape_init_pc(pc);
1992 pc->c[0] = POSITION_TO_ELEMENT;
1994 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1995 pc->c[8] = partition;
1996 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1997 pc->idetape_callback = &idetape_pc_callback;
2000 static int idetape_create_prevent_cmd(ide_drive_t *drive,
2001 struct ide_atapi_pc *pc, int prevent)
2003 idetape_tape_t *tape = drive->driver_data;
2005 /* device supports locking according to capabilities page */
2006 if (!(tape->caps[6] & 0x01))
2009 idetape_init_pc(pc);
2010 pc->c[0] = ALLOW_MEDIUM_REMOVAL;
2012 pc->idetape_callback = &idetape_pc_callback;
2016 static int __idetape_discard_read_pipeline(ide_drive_t *drive)
2018 idetape_tape_t *tape = drive->driver_data;
2019 unsigned long flags;
2022 if (tape->chrdev_dir != IDETAPE_DIR_READ)
2025 /* Remove merge stage. */
2026 cnt = tape->merge_stage_size / tape->blk_size;
2027 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
2028 ++cnt; /* Filemarks count as 1 sector */
2029 tape->merge_stage_size = 0;
2030 if (tape->merge_stage != NULL) {
2031 __idetape_kfree_stage(tape->merge_stage);
2032 tape->merge_stage = NULL;
2035 /* Clear pipeline flags. */
2036 clear_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags);
2037 tape->chrdev_dir = IDETAPE_DIR_NONE;
2039 /* Remove pipeline stages. */
2040 if (tape->first_stage == NULL)
2043 spin_lock_irqsave(&tape->lock, flags);
2044 tape->next_stage = NULL;
2045 if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags))
2046 idetape_wait_for_request(drive, tape->active_data_rq);
2047 spin_unlock_irqrestore(&tape->lock, flags);
2049 while (tape->first_stage != NULL) {
2050 struct request *rq_ptr = &tape->first_stage->rq;
2052 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
2053 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
2055 idetape_remove_stage_head(drive);
2057 tape->nr_pending_stages = 0;
2058 tape->max_stages = tape->min_pipeline;
2063 * Position the tape to the requested block using the LOCATE packet command.
2064 * A READ POSITION command is then issued to check where we are positioned. Like
2065 * all higher level operations, we queue the commands at the tail of the request
2066 * queue and wait for their completion.
2068 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
2069 u8 partition, int skip)
2071 idetape_tape_t *tape = drive->driver_data;
2073 struct ide_atapi_pc pc;
2075 if (tape->chrdev_dir == IDETAPE_DIR_READ)
2076 __idetape_discard_read_pipeline(drive);
2077 idetape_wait_ready(drive, 60 * 5 * HZ);
2078 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
2079 retval = idetape_queue_pc_tail(drive, &pc);
2083 idetape_create_read_position_cmd(&pc);
2084 return (idetape_queue_pc_tail(drive, &pc));
2087 static void idetape_discard_read_pipeline(ide_drive_t *drive,
2088 int restore_position)
2090 idetape_tape_t *tape = drive->driver_data;
2094 cnt = __idetape_discard_read_pipeline(drive);
2095 if (restore_position) {
2096 position = idetape_read_position(drive);
2097 seek = position > cnt ? position - cnt : 0;
2098 if (idetape_position_tape(drive, seek, 0, 0)) {
2099 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
2100 " discard_pipeline()\n", tape->name);
2107 * Generate a read/write request for the block device interface and wait for it
2110 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
2111 struct idetape_bh *bh)
2113 idetape_tape_t *tape = drive->driver_data;
2116 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
2118 if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags)) {
2119 printk(KERN_ERR "ide-tape: bug: the pipeline is active in %s\n",
2124 idetape_init_rq(&rq, cmd);
2125 rq.rq_disk = tape->disk;
2126 rq.special = (void *)bh;
2127 rq.sector = tape->first_frame;
2128 rq.nr_sectors = blocks;
2129 rq.current_nr_sectors = blocks;
2130 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
2132 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
2135 if (tape->merge_stage)
2136 idetape_init_merge_stage(tape);
2137 if (rq.errors == IDETAPE_ERROR_GENERAL)
2139 return (tape->blk_size * (blocks-rq.current_nr_sectors));
2142 /* start servicing the pipeline stages, starting from tape->next_stage. */
2143 static void idetape_plug_pipeline(ide_drive_t *drive)
2145 idetape_tape_t *tape = drive->driver_data;
2147 if (tape->next_stage == NULL)
2149 if (!test_and_set_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags)) {
2150 idetape_activate_next_stage(drive);
2151 (void) ide_do_drive_cmd(drive, tape->active_data_rq, ide_end);
2155 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
2157 idetape_init_pc(pc);
2161 pc->idetape_callback = &idetape_pc_callback;
2164 static void idetape_create_rewind_cmd(ide_drive_t *drive,
2165 struct ide_atapi_pc *pc)
2167 idetape_init_pc(pc);
2168 pc->c[0] = REZERO_UNIT;
2169 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
2170 pc->idetape_callback = &idetape_pc_callback;
2173 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
2175 idetape_init_pc(pc);
2178 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
2179 pc->idetape_callback = &idetape_pc_callback;
2182 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
2184 idetape_init_pc(pc);
2186 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
2188 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
2189 pc->idetape_callback = &idetape_pc_callback;
2192 static void idetape_wait_first_stage(ide_drive_t *drive)
2194 idetape_tape_t *tape = drive->driver_data;
2195 unsigned long flags;
2197 if (tape->first_stage == NULL)
2199 spin_lock_irqsave(&tape->lock, flags);
2200 if (tape->active_stage == tape->first_stage)
2201 idetape_wait_for_request(drive, tape->active_data_rq);
2202 spin_unlock_irqrestore(&tape->lock, flags);
2205 /* Queue up a character device originated write request. */
2206 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
2208 idetape_tape_t *tape = drive->driver_data;
2209 unsigned long flags;
2211 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2213 /* Attempt to allocate a new stage. Beware possible race conditions. */
2215 spin_lock_irqsave(&tape->lock, flags);
2216 if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags)) {
2217 idetape_wait_for_request(drive, tape->active_data_rq);
2218 spin_unlock_irqrestore(&tape->lock, flags);
2220 spin_unlock_irqrestore(&tape->lock, flags);
2221 idetape_plug_pipeline(drive);
2222 if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE,
2225 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
2226 blocks, tape->merge_stage->bh);
2232 * Wait until all pending pipeline requests are serviced. Typically called on
2235 static void idetape_wait_for_pipeline(ide_drive_t *drive)
2237 idetape_tape_t *tape = drive->driver_data;
2238 unsigned long flags;
2240 while (tape->next_stage || test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE,
2242 idetape_plug_pipeline(drive);
2243 spin_lock_irqsave(&tape->lock, flags);
2244 if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags))
2245 idetape_wait_for_request(drive, tape->active_data_rq);
2246 spin_unlock_irqrestore(&tape->lock, flags);
2250 static void idetape_empty_write_pipeline(ide_drive_t *drive)
2252 idetape_tape_t *tape = drive->driver_data;
2254 struct idetape_bh *bh;
2256 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
2257 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline,"
2258 " but we are not writing.\n");
2261 if (tape->merge_stage_size > tape->stage_size) {
2262 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
2263 tape->merge_stage_size = tape->stage_size;
2265 if (tape->merge_stage_size) {
2266 blocks = tape->merge_stage_size / tape->blk_size;
2267 if (tape->merge_stage_size % tape->blk_size) {
2271 i = tape->blk_size - tape->merge_stage_size %
2273 bh = tape->bh->b_reqnext;
2275 atomic_set(&bh->b_count, 0);
2281 printk(KERN_INFO "ide-tape: bug,"
2285 min = min(i, (unsigned int)(bh->b_size -
2286 atomic_read(&bh->b_count)));
2287 memset(bh->b_data + atomic_read(&bh->b_count),
2289 atomic_add(min, &bh->b_count);
2294 (void) idetape_add_chrdev_write_request(drive, blocks);
2295 tape->merge_stage_size = 0;
2297 idetape_wait_for_pipeline(drive);
2298 if (tape->merge_stage != NULL) {
2299 __idetape_kfree_stage(tape->merge_stage);
2300 tape->merge_stage = NULL;
2302 clear_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags);
2303 tape->chrdev_dir = IDETAPE_DIR_NONE;
2306 * On the next backup, perform the feedback loop again. (I don't want to
2307 * keep sense information between backups, as some systems are
2308 * constantly on, and the system load can be totally different on the
2311 tape->max_stages = tape->min_pipeline;
2312 if (tape->first_stage != NULL ||
2313 tape->next_stage != NULL ||
2314 tape->last_stage != NULL ||
2315 tape->nr_stages != 0) {
2316 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
2317 "first_stage %p, next_stage %p, "
2318 "last_stage %p, nr_stages %d\n",
2319 tape->first_stage, tape->next_stage,
2320 tape->last_stage, tape->nr_stages);
2324 static void idetape_restart_speed_control(ide_drive_t *drive)
2326 idetape_tape_t *tape = drive->driver_data;
2328 tape->restart_speed_control_req = 0;
2329 tape->pipeline_head = 0;
2330 tape->controlled_last_pipeline_head = 0;
2331 tape->controlled_previous_pipeline_head = 0;
2332 tape->uncontrolled_previous_pipeline_head = 0;
2333 tape->controlled_pipeline_head_speed = 5000;
2334 tape->pipeline_head_speed = 5000;
2335 tape->uncontrolled_pipeline_head_speed = 0;
2336 tape->controlled_pipeline_head_time =
2337 tape->uncontrolled_pipeline_head_time = jiffies;
2338 tape->controlled_previous_head_time =
2339 tape->uncontrolled_previous_head_time = jiffies;
2342 static int idetape_init_read(ide_drive_t *drive, int max_stages)
2344 idetape_tape_t *tape = drive->driver_data;
2345 idetape_stage_t *new_stage;
2348 u16 blocks = *(u16 *)&tape->caps[12];
2350 /* Initialize read operation */
2351 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
2352 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
2353 idetape_empty_write_pipeline(drive);
2354 idetape_flush_tape_buffers(drive);
2356 if (tape->merge_stage || tape->merge_stage_size) {
2357 printk(KERN_ERR "ide-tape: merge_stage_size should be"
2359 tape->merge_stage_size = 0;
2361 tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0);
2362 if (!tape->merge_stage)
2364 tape->chrdev_dir = IDETAPE_DIR_READ;
2367 * Issue a read 0 command to ensure that DSC handshake is
2368 * switched from completion mode to buffer available mode.
2369 * No point in issuing this if DSC overlap isn't supported, some
2370 * drives (Seagate STT3401A) will return an error.
2372 if (drive->dsc_overlap) {
2373 bytes_read = idetape_queue_rw_tail(drive,
2374 REQ_IDETAPE_READ, 0,
2375 tape->merge_stage->bh);
2376 if (bytes_read < 0) {
2377 __idetape_kfree_stage(tape->merge_stage);
2378 tape->merge_stage = NULL;
2379 tape->chrdev_dir = IDETAPE_DIR_NONE;
2384 if (tape->restart_speed_control_req)
2385 idetape_restart_speed_control(drive);
2386 idetape_init_rq(&rq, REQ_IDETAPE_READ);
2387 rq.sector = tape->first_frame;
2388 rq.nr_sectors = blocks;
2389 rq.current_nr_sectors = blocks;
2390 if (!test_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags) &&
2391 tape->nr_stages < max_stages) {
2392 new_stage = idetape_kmalloc_stage(tape);
2393 while (new_stage != NULL) {
2395 idetape_add_stage_tail(drive, new_stage);
2396 if (tape->nr_stages >= max_stages)
2398 new_stage = idetape_kmalloc_stage(tape);
2401 if (!test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags)) {
2402 if (tape->nr_pending_stages >= 3 * max_stages / 4) {
2403 tape->measure_insert_time = 1;
2404 tape->insert_time = jiffies;
2405 tape->insert_size = 0;
2406 tape->insert_speed = 0;
2407 idetape_plug_pipeline(drive);
2414 * Called from idetape_chrdev_read() to service a character device read request
2415 * and add read-ahead requests to our pipeline.
2417 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
2419 idetape_tape_t *tape = drive->driver_data;
2420 unsigned long flags;
2421 struct request *rq_ptr;
2424 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
2426 /* If we are at a filemark, return a read length of 0 */
2427 if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
2430 /* Wait for the next block to reach the head of the pipeline. */
2431 idetape_init_read(drive, tape->max_stages);
2432 if (tape->first_stage == NULL) {
2433 if (test_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags))
2435 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
2436 tape->merge_stage->bh);
2438 idetape_wait_first_stage(drive);
2439 rq_ptr = &tape->first_stage->rq;
2440 bytes_read = tape->blk_size * (rq_ptr->nr_sectors -
2441 rq_ptr->current_nr_sectors);
2442 rq_ptr->nr_sectors = 0;
2443 rq_ptr->current_nr_sectors = 0;
2445 if (rq_ptr->errors == IDETAPE_ERROR_EOD)
2448 idetape_switch_buffers(tape, tape->first_stage);
2449 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
2450 set_bit(IDETAPE_FLAG_FILEMARK, &tape->flags);
2451 spin_lock_irqsave(&tape->lock, flags);
2452 idetape_remove_stage_head(drive);
2453 spin_unlock_irqrestore(&tape->lock, flags);
2454 tape->pipeline_head++;
2455 idetape_calculate_speeds(drive);
2457 if (bytes_read > blocks * tape->blk_size) {
2458 printk(KERN_ERR "ide-tape: bug: trying to return more bytes"
2459 " than requested\n");
2460 bytes_read = blocks * tape->blk_size;
2462 return (bytes_read);
2465 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
2467 idetape_tape_t *tape = drive->driver_data;
2468 struct idetape_bh *bh;
2474 bh = tape->merge_stage->bh;
2475 count = min(tape->stage_size, bcount);
2477 blocks = count / tape->blk_size;
2479 atomic_set(&bh->b_count,
2480 min(count, (unsigned int)bh->b_size));
2481 memset(bh->b_data, 0, atomic_read(&bh->b_count));
2482 count -= atomic_read(&bh->b_count);
2485 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
2486 tape->merge_stage->bh);
2490 static int idetape_pipeline_size(ide_drive_t *drive)
2492 idetape_tape_t *tape = drive->driver_data;
2493 idetape_stage_t *stage;
2497 idetape_wait_for_pipeline(drive);
2498 stage = tape->first_stage;
2499 while (stage != NULL) {
2501 size += tape->blk_size * (rq->nr_sectors -
2502 rq->current_nr_sectors);
2503 if (rq->errors == IDETAPE_ERROR_FILEMARK)
2504 size += tape->blk_size;
2505 stage = stage->next;
2507 size += tape->merge_stage_size;
2512 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
2513 * currently support only one partition.
2515 static int idetape_rewind_tape(ide_drive_t *drive)
2518 struct ide_atapi_pc pc;
2519 idetape_tape_t *tape;
2520 tape = drive->driver_data;
2522 debug_log(DBG_SENSE, "Enter %s\n", __func__);
2524 idetape_create_rewind_cmd(drive, &pc);
2525 retval = idetape_queue_pc_tail(drive, &pc);
2529 idetape_create_read_position_cmd(&pc);
2530 retval = idetape_queue_pc_tail(drive, &pc);
2536 /* mtio.h compatible commands should be issued to the chrdev interface. */
2537 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
2540 idetape_tape_t *tape = drive->driver_data;
2541 void __user *argp = (void __user *)arg;
2543 struct idetape_config {
2544 int dsc_rw_frequency;
2545 int dsc_media_access_frequency;
2549 debug_log(DBG_PROCS, "Enter %s\n", __func__);
2553 if (copy_from_user(&config, argp, sizeof(config)))
2555 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
2556 tape->max_stages = config.nr_stages;
2559 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
2560 config.nr_stages = tape->max_stages;
2561 if (copy_to_user(argp, &config, sizeof(config)))
2571 * The function below is now a bit more complicated than just passing the
2572 * command to the tape since we may have crossed some filemarks during our
2573 * pipelined read-ahead mode. As a minor side effect, the pipeline enables us to
2574 * support MTFSFM when the filemark is in our internal pipeline even if the tape
2575 * doesn't support spacing over filemarks in the reverse direction.
2577 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
2580 idetape_tape_t *tape = drive->driver_data;
2581 struct ide_atapi_pc pc;
2582 unsigned long flags;
2583 int retval, count = 0;
2584 int sprev = !!(tape->caps[4] & 0x20);
2588 if (MTBSF == mt_op || MTBSFM == mt_op) {
2591 mt_count = -mt_count;
2594 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2595 /* its a read-ahead buffer, scan it for crossed filemarks. */
2596 tape->merge_stage_size = 0;
2597 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
2599 while (tape->first_stage != NULL) {
2600 if (count == mt_count) {
2601 if (mt_op == MTFSFM)
2602 set_bit(IDETAPE_FLAG_FILEMARK,
2606 spin_lock_irqsave(&tape->lock, flags);
2607 if (tape->first_stage == tape->active_stage) {
2609 * We have reached the active stage in the read
2610 * pipeline. There is no point in allowing the
2611 * drive to continue reading any farther, so we
2612 * stop the pipeline.
2614 * This section should be moved to a separate
2615 * subroutine because similar operations are
2616 * done in __idetape_discard_read_pipeline(),
2619 tape->next_stage = NULL;
2620 spin_unlock_irqrestore(&tape->lock, flags);
2621 idetape_wait_first_stage(drive);
2622 tape->next_stage = tape->first_stage->next;
2624 spin_unlock_irqrestore(&tape->lock, flags);
2625 if (tape->first_stage->rq.errors ==
2626 IDETAPE_ERROR_FILEMARK)
2628 idetape_remove_stage_head(drive);
2630 idetape_discard_read_pipeline(drive, 0);
2634 * The filemark was not found in our internal pipeline; now we can issue
2635 * the space command.
2640 idetape_create_space_cmd(&pc, mt_count - count,
2641 IDETAPE_SPACE_OVER_FILEMARK);
2642 return idetape_queue_pc_tail(drive, &pc);
2647 retval = idetape_space_over_filemarks(drive, MTFSF,
2651 count = (MTBSFM == mt_op ? 1 : -1);
2652 return idetape_space_over_filemarks(drive, MTFSF, count);
2654 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
2661 * Our character device read / write functions.
2663 * The tape is optimized to maximize throughput when it is transferring an
2664 * integral number of the "continuous transfer limit", which is a parameter of
2665 * the specific tape (26kB on my particular tape, 32kB for Onstream).
2667 * As of version 1.3 of the driver, the character device provides an abstract
2668 * continuous view of the media - any mix of block sizes (even 1 byte) on the
2669 * same backup/restore procedure is supported. The driver will internally
2670 * convert the requests to the recommended transfer unit, so that an unmatch
2671 * between the user's block size to the recommended size will only result in a
2672 * (slightly) increased driver overhead, but will no longer hit performance.
2673 * This is not applicable to Onstream.
2675 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
2676 size_t count, loff_t *ppos)
2678 struct ide_tape_obj *tape = ide_tape_f(file);
2679 ide_drive_t *drive = tape->drive;
2680 ssize_t bytes_read, temp, actually_read = 0, rc;
2682 u16 ctl = *(u16 *)&tape->caps[12];
2684 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
2686 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
2687 if (test_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags))
2688 if (count > tape->blk_size &&
2689 (count % tape->blk_size) == 0)
2690 tape->user_bs_factor = count / tape->blk_size;
2692 rc = idetape_init_read(drive, tape->max_stages);
2697 if (tape->merge_stage_size) {
2698 actually_read = min((unsigned int)(tape->merge_stage_size),
2699 (unsigned int)count);
2700 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage,
2703 buf += actually_read;
2704 tape->merge_stage_size -= actually_read;
2705 count -= actually_read;
2707 while (count >= tape->stage_size) {
2708 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
2709 if (bytes_read <= 0)
2711 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage,
2715 count -= bytes_read;
2716 actually_read += bytes_read;
2719 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
2720 if (bytes_read <= 0)
2722 temp = min((unsigned long)count, (unsigned long)bytes_read);
2723 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage,
2726 actually_read += temp;
2727 tape->merge_stage_size = bytes_read-temp;
2730 if (!actually_read && test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) {
2731 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
2733 idetape_space_over_filemarks(drive, MTFSF, 1);
2737 return ret ? ret : actually_read;
2740 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
2741 size_t count, loff_t *ppos)
2743 struct ide_tape_obj *tape = ide_tape_f(file);
2744 ide_drive_t *drive = tape->drive;
2745 ssize_t actually_written = 0;
2747 u16 ctl = *(u16 *)&tape->caps[12];
2749 /* The drive is write protected. */
2750 if (tape->write_prot)
2753 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
2755 /* Initialize write operation */
2756 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
2757 if (tape->chrdev_dir == IDETAPE_DIR_READ)
2758 idetape_discard_read_pipeline(drive, 1);
2759 if (tape->merge_stage || tape->merge_stage_size) {
2760 printk(KERN_ERR "ide-tape: merge_stage_size "
2761 "should be 0 now\n");
2762 tape->merge_stage_size = 0;
2764 tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0);
2765 if (!tape->merge_stage)
2767 tape->chrdev_dir = IDETAPE_DIR_WRITE;
2768 idetape_init_merge_stage(tape);
2771 * Issue a write 0 command to ensure that DSC handshake is
2772 * switched from completion mode to buffer available mode. No
2773 * point in issuing this if DSC overlap isn't supported, some
2774 * drives (Seagate STT3401A) will return an error.
2776 if (drive->dsc_overlap) {
2777 ssize_t retval = idetape_queue_rw_tail(drive,
2778 REQ_IDETAPE_WRITE, 0,
2779 tape->merge_stage->bh);
2781 __idetape_kfree_stage(tape->merge_stage);
2782 tape->merge_stage = NULL;
2783 tape->chrdev_dir = IDETAPE_DIR_NONE;
2790 if (tape->restart_speed_control_req)
2791 idetape_restart_speed_control(drive);
2792 if (tape->merge_stage_size) {
2793 if (tape->merge_stage_size >= tape->stage_size) {
2794 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
2795 tape->merge_stage_size = 0;
2797 actually_written = min((unsigned int)
2798 (tape->stage_size - tape->merge_stage_size),
2799 (unsigned int)count);
2800 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf,
2803 buf += actually_written;
2804 tape->merge_stage_size += actually_written;
2805 count -= actually_written;
2807 if (tape->merge_stage_size == tape->stage_size) {
2809 tape->merge_stage_size = 0;
2810 retval = idetape_add_chrdev_write_request(drive, ctl);
2815 while (count >= tape->stage_size) {
2817 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf,
2820 buf += tape->stage_size;
2821 count -= tape->stage_size;
2822 retval = idetape_add_chrdev_write_request(drive, ctl);
2823 actually_written += tape->stage_size;
2828 actually_written += count;
2829 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf,
2832 tape->merge_stage_size += count;
2834 return ret ? ret : actually_written;
2837 static int idetape_write_filemark(ide_drive_t *drive)
2839 struct ide_atapi_pc pc;
2841 /* Write a filemark */
2842 idetape_create_write_filemark_cmd(drive, &pc, 1);
2843 if (idetape_queue_pc_tail(drive, &pc)) {
2844 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
2851 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
2854 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
2855 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
2856 * usually not supported (it is supported in the rare case in which we crossed
2857 * the filemark during our read-ahead pipelined operation mode).
2859 * The following commands are currently not supported:
2861 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
2862 * MT_ST_WRITE_THRESHOLD.
2864 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
2866 idetape_tape_t *tape = drive->driver_data;
2867 struct ide_atapi_pc pc;
2870 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
2873 /* Commands which need our pipelined read-ahead stages. */
2881 return idetape_space_over_filemarks(drive, mt_op, mt_count);
2888 if (tape->write_prot)
2890 idetape_discard_read_pipeline(drive, 1);
2891 for (i = 0; i < mt_count; i++) {
2892 retval = idetape_write_filemark(drive);
2898 idetape_discard_read_pipeline(drive, 0);
2899 if (idetape_rewind_tape(drive))
2903 idetape_discard_read_pipeline(drive, 0);
2904 idetape_create_load_unload_cmd(drive, &pc,
2905 IDETAPE_LU_LOAD_MASK);
2906 return idetape_queue_pc_tail(drive, &pc);
2910 * If door is locked, attempt to unlock before
2911 * attempting to eject.
2913 if (tape->door_locked) {
2914 if (idetape_create_prevent_cmd(drive, &pc, 0))
2915 if (!idetape_queue_pc_tail(drive, &pc))
2916 tape->door_locked = DOOR_UNLOCKED;
2918 idetape_discard_read_pipeline(drive, 0);
2919 idetape_create_load_unload_cmd(drive, &pc,
2920 !IDETAPE_LU_LOAD_MASK);
2921 retval = idetape_queue_pc_tail(drive, &pc);
2923 clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags);
2926 idetape_discard_read_pipeline(drive, 0);
2927 return idetape_flush_tape_buffers(drive);
2929 idetape_discard_read_pipeline(drive, 0);
2930 idetape_create_load_unload_cmd(drive, &pc,
2931 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
2932 return idetape_queue_pc_tail(drive, &pc);
2934 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
2935 return idetape_queue_pc_tail(drive, &pc);
2937 (void)idetape_rewind_tape(drive);
2938 idetape_create_erase_cmd(&pc);
2939 return idetape_queue_pc_tail(drive, &pc);
2942 if (mt_count < tape->blk_size ||
2943 mt_count % tape->blk_size)
2945 tape->user_bs_factor = mt_count / tape->blk_size;
2946 clear_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags);
2948 set_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags);
2951 idetape_discard_read_pipeline(drive, 0);
2952 return idetape_position_tape(drive,
2953 mt_count * tape->user_bs_factor, tape->partition, 0);
2955 idetape_discard_read_pipeline(drive, 0);
2956 return idetape_position_tape(drive, 0, mt_count, 0);
2960 if (!idetape_create_prevent_cmd(drive, &pc, 1))
2962 retval = idetape_queue_pc_tail(drive, &pc);
2965 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
2968 if (!idetape_create_prevent_cmd(drive, &pc, 0))
2970 retval = idetape_queue_pc_tail(drive, &pc);
2973 tape->door_locked = DOOR_UNLOCKED;
2976 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
2983 * Our character device ioctls. General mtio.h magnetic io commands are
2984 * supported here, and not in the corresponding block interface. Our own
2985 * ide-tape ioctls are supported on both interfaces.
2987 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
2988 unsigned int cmd, unsigned long arg)
2990 struct ide_tape_obj *tape = ide_tape_f(file);
2991 ide_drive_t *drive = tape->drive;
2995 int block_offset = 0, position = tape->first_frame;
2996 void __user *argp = (void __user *)arg;
2998 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
3000 tape->restart_speed_control_req = 1;
3001 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
3002 idetape_empty_write_pipeline(drive);
3003 idetape_flush_tape_buffers(drive);
3005 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
3006 block_offset = idetape_pipeline_size(drive) /
3007 (tape->blk_size * tape->user_bs_factor);
3008 position = idetape_read_position(drive);
3014 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
3016 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
3018 memset(&mtget, 0, sizeof(struct mtget));
3019 mtget.mt_type = MT_ISSCSI2;
3020 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
3022 ((tape->blk_size * tape->user_bs_factor)
3023 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
3025 if (tape->drv_write_prot)
3026 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
3028 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
3032 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
3033 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
3037 if (tape->chrdev_dir == IDETAPE_DIR_READ)
3038 idetape_discard_read_pipeline(drive, 1);
3039 return idetape_blkdev_ioctl(drive, cmd, arg);
3044 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
3045 * block size with the reported value.
3047 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
3049 idetape_tape_t *tape = drive->driver_data;
3050 struct ide_atapi_pc pc;
3052 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
3053 if (idetape_queue_pc_tail(drive, &pc)) {
3054 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
3055 if (tape->blk_size == 0) {
3056 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
3057 "block size, assuming 32k\n");
3058 tape->blk_size = 32768;
3062 tape->blk_size = (pc.buf[4 + 5] << 16) +
3063 (pc.buf[4 + 6] << 8) +
3065 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
3068 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
3070 unsigned int minor = iminor(inode), i = minor & ~0xc0;
3072 idetape_tape_t *tape;
3073 struct ide_atapi_pc pc;
3076 if (i >= MAX_HWIFS * MAX_DRIVES)
3079 tape = ide_tape_chrdev_get(i);
3083 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
3086 * We really want to do nonseekable_open(inode, filp); here, but some
3087 * versions of tar incorrectly call lseek on tapes and bail out if that
3088 * fails. So we disallow pread() and pwrite(), but permit lseeks.
3090 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
3092 drive = tape->drive;
3094 filp->private_data = tape;
3096 if (test_and_set_bit(IDETAPE_FLAG_BUSY, &tape->flags)) {
3101 retval = idetape_wait_ready(drive, 60 * HZ);
3103 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
3104 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
3108 idetape_read_position(drive);
3109 if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags))
3110 (void)idetape_rewind_tape(drive);
3112 if (tape->chrdev_dir != IDETAPE_DIR_READ)
3113 clear_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags);
3115 /* Read block size and write protect status from drive. */
3116 ide_tape_get_bsize_from_bdesc(drive);
3118 /* Set write protect flag if device is opened as read-only. */
3119 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
3120 tape->write_prot = 1;
3122 tape->write_prot = tape->drv_write_prot;
3124 /* Make sure drive isn't write protected if user wants to write. */
3125 if (tape->write_prot) {
3126 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
3127 (filp->f_flags & O_ACCMODE) == O_RDWR) {
3128 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
3134 /* Lock the tape drive door so user can't eject. */
3135 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
3136 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
3137 if (!idetape_queue_pc_tail(drive, &pc)) {
3138 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
3139 tape->door_locked = DOOR_LOCKED;
3143 idetape_restart_speed_control(drive);
3144 tape->restart_speed_control_req = 0;
3152 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
3154 idetape_tape_t *tape = drive->driver_data;
3156 idetape_empty_write_pipeline(drive);
3157 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
3158 if (tape->merge_stage != NULL) {
3159 idetape_pad_zeros(drive, tape->blk_size *
3160 (tape->user_bs_factor - 1));
3161 __idetape_kfree_stage(tape->merge_stage);
3162 tape->merge_stage = NULL;
3164 idetape_write_filemark(drive);
3165 idetape_flush_tape_buffers(drive);
3166 idetape_flush_tape_buffers(drive);
3169 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
3171 struct ide_tape_obj *tape = ide_tape_f(filp);
3172 ide_drive_t *drive = tape->drive;
3173 struct ide_atapi_pc pc;
3174 unsigned int minor = iminor(inode);
3177 tape = drive->driver_data;
3179 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
3181 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
3182 idetape_write_release(drive, minor);
3183 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
3185 idetape_discard_read_pipeline(drive, 1);
3187 idetape_wait_for_pipeline(drive);
3190 if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags))
3191 (void) idetape_rewind_tape(drive);
3192 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
3193 if (tape->door_locked == DOOR_LOCKED) {
3194 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
3195 if (!idetape_queue_pc_tail(drive, &pc))
3196 tape->door_locked = DOOR_UNLOCKED;
3200 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
3207 * check the contents of the ATAPI IDENTIFY command results. We return:
3209 * 1 - If the tape can be supported by us, based on the information we have so
3212 * 0 - If this tape driver is not currently supported by us.
3214 static int idetape_identify_device(ide_drive_t *drive)
3216 u8 gcw[2], protocol, device_type, removable, packet_size;
3218 if (drive->id_read == 0)
3221 *((unsigned short *) &gcw) = drive->id->config;
3223 protocol = (gcw[1] & 0xC0) >> 6;
3224 device_type = gcw[1] & 0x1F;
3225 removable = !!(gcw[0] & 0x80);
3226 packet_size = gcw[0] & 0x3;
3228 /* Check that we can support this device */
3230 printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n",
3232 else if (device_type != 1)
3233 printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set "
3234 "to tape\n", device_type);
3235 else if (!removable)
3236 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
3237 else if (packet_size != 0) {
3238 printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12"
3239 " bytes\n", packet_size);
3245 static void idetape_get_inquiry_results(ide_drive_t *drive)
3247 idetape_tape_t *tape = drive->driver_data;
3248 struct ide_atapi_pc pc;
3249 char fw_rev[6], vendor_id[10], product_id[18];
3251 idetape_create_inquiry_cmd(&pc);
3252 if (idetape_queue_pc_tail(drive, &pc)) {
3253 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
3257 memcpy(vendor_id, &pc.buf[8], 8);
3258 memcpy(product_id, &pc.buf[16], 16);
3259 memcpy(fw_rev, &pc.buf[32], 4);
3261 ide_fixstring(vendor_id, 10, 0);
3262 ide_fixstring(product_id, 18, 0);
3263 ide_fixstring(fw_rev, 6, 0);
3265 printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n",
3266 drive->name, tape->name, vendor_id, product_id, fw_rev);
3270 * Ask the tape about its various parameters. In particular, we will adjust our
3271 * data transfer buffer size to the recommended value as returned by the tape.
3273 static void idetape_get_mode_sense_results(ide_drive_t *drive)
3275 idetape_tape_t *tape = drive->driver_data;
3276 struct ide_atapi_pc pc;
3278 u8 speed, max_speed;
3280 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
3281 if (idetape_queue_pc_tail(drive, &pc)) {
3282 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
3283 " some default values\n");
3284 tape->blk_size = 512;
3285 put_unaligned(52, (u16 *)&tape->caps[12]);
3286 put_unaligned(540, (u16 *)&tape->caps[14]);
3287 put_unaligned(6*52, (u16 *)&tape->caps[16]);
3290 caps = pc.buf + 4 + pc.buf[3];
3292 /* convert to host order and save for later use */
3293 speed = be16_to_cpu(*(u16 *)&caps[14]);
3294 max_speed = be16_to_cpu(*(u16 *)&caps[8]);
3296 put_unaligned(max_speed, (u16 *)&caps[8]);
3297 put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]);
3298 put_unaligned(speed, (u16 *)&caps[14]);
3299 put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]);
3302 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
3303 "(assuming 650KB/sec)\n", drive->name);
3304 put_unaligned(650, (u16 *)&caps[14]);
3307 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
3308 "(assuming 650KB/sec)\n", drive->name);
3309 put_unaligned(650, (u16 *)&caps[8]);
3312 memcpy(&tape->caps, caps, 20);
3314 tape->blk_size = 512;
3315 else if (caps[7] & 0x04)
3316 tape->blk_size = 1024;
3319 #ifdef CONFIG_IDE_PROC_FS
3320 static void idetape_add_settings(ide_drive_t *drive)
3322 idetape_tape_t *tape = drive->driver_data;
3324 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
3325 1, 2, (u16 *)&tape->caps[16], NULL);
3326 ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff,
3327 tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
3328 ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff,
3329 tape->stage_size / 1024, 1, &tape->max_stages, NULL);
3330 ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff,
3331 tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
3332 ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0,
3333 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages,
3335 ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0,
3336 0xffff, tape->stage_size / 1024, 1,
3337 &tape->nr_pending_stages, NULL);
3338 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
3339 1, 1, (u16 *)&tape->caps[14], NULL);
3340 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1,
3341 1024, &tape->stage_size, NULL);
3342 ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN,
3343 IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq,
3345 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1,
3346 1, &drive->dsc_overlap, NULL);
3347 ide_add_setting(drive, "pipeline_head_speed_c", SETTING_READ, TYPE_INT,
3348 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed,
3350 ide_add_setting(drive, "pipeline_head_speed_u", SETTING_READ, TYPE_INT,
3352 &tape->uncontrolled_pipeline_head_speed, NULL);
3353 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff,
3354 1, 1, &tape->avg_speed, NULL);
3355 ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1,
3356 1, &tape->debug_mask, NULL);
3359 static inline void idetape_add_settings(ide_drive_t *drive) { ; }
3363 * The function below is called to:
3365 * 1. Initialize our various state variables.
3366 * 2. Ask the tape for its capabilities.
3367 * 3. Allocate a buffer which will be used for data transfer. The buffer size
3368 * is chosen based on the recommendation which we received in step 2.
3370 * Note that at this point ide.c already assigned us an irq, so that we can
3371 * queue requests here and wait for their completion.
3373 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
3375 unsigned long t1, tmid, tn, t;
3380 u16 *ctl = (u16 *)&tape->caps[12];
3382 spin_lock_init(&tape->lock);
3383 drive->dsc_overlap = 1;
3384 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
3385 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
3387 drive->dsc_overlap = 0;
3389 /* Seagate Travan drives do not support DSC overlap. */
3390 if (strstr(drive->id->model, "Seagate STT3401"))
3391 drive->dsc_overlap = 0;
3392 tape->minor = minor;
3393 tape->name[0] = 'h';
3394 tape->name[1] = 't';
3395 tape->name[2] = '0' + minor;
3396 tape->chrdev_dir = IDETAPE_DIR_NONE;
3397 tape->pc = tape->pc_stack;
3398 tape->max_insert_speed = 10000;
3399 tape->speed_control = 1;
3400 *((unsigned short *) &gcw) = drive->id->config;
3402 /* Command packet DRQ type */
3403 if (((gcw[0] & 0x60) >> 5) == 1)
3404 set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags);
3406 tape->min_pipeline = 10;
3407 tape->max_pipeline = 10;
3408 tape->max_stages = 10;
3410 idetape_get_inquiry_results(drive);
3411 idetape_get_mode_sense_results(drive);
3412 ide_tape_get_bsize_from_bdesc(drive);
3413 tape->user_bs_factor = 1;
3414 tape->stage_size = *ctl * tape->blk_size;
3415 while (tape->stage_size > 0xffff) {
3416 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
3418 tape->stage_size = *ctl * tape->blk_size;
3420 stage_size = tape->stage_size;
3421 tape->pages_per_stage = stage_size / PAGE_SIZE;
3422 if (stage_size % PAGE_SIZE) {
3423 tape->pages_per_stage++;
3424 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
3427 /* Select the "best" DSC read/write polling freq and pipeline size. */
3428 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
3430 tape->max_stages = speed * 1000 * 10 / tape->stage_size;
3432 /* Limit memory use for pipeline to 10% of physical memory */
3434 if (tape->max_stages * tape->stage_size >
3435 si.totalram * si.mem_unit / 10)
3437 si.totalram * si.mem_unit / (10 * tape->stage_size);
3439 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
3440 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
3441 tape->max_pipeline =
3442 min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
3443 if (tape->max_stages == 0) {
3444 tape->max_stages = 1;
3445 tape->min_pipeline = 1;
3446 tape->max_pipeline = 1;
3449 t1 = (tape->stage_size * HZ) / (speed * 1000);
3450 tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125);
3451 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
3453 if (tape->max_stages)
3459 * Ensure that the number we got makes sense; limit it within
3460 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
3462 tape->best_dsc_rw_freq = max_t(unsigned long,
3463 min_t(unsigned long, t, IDETAPE_DSC_RW_MAX),
3464 IDETAPE_DSC_RW_MIN);
3465 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
3466 "%dkB pipeline, %lums tDSC%s\n",
3467 drive->name, tape->name, *(u16 *)&tape->caps[14],
3468 (*(u16 *)&tape->caps[16] * 512) / tape->stage_size,
3469 tape->stage_size / 1024,
3470 tape->max_stages * tape->stage_size / 1024,
3471 tape->best_dsc_rw_freq * 1000 / HZ,
3472 drive->using_dma ? ", DMA":"");
3474 idetape_add_settings(drive);
3477 static void ide_tape_remove(ide_drive_t *drive)
3479 idetape_tape_t *tape = drive->driver_data;
3481 ide_proc_unregister_driver(drive, tape->driver);
3483 ide_unregister_region(tape->disk);
3488 static void ide_tape_release(struct kref *kref)
3490 struct ide_tape_obj *tape = to_ide_tape(kref);
3491 ide_drive_t *drive = tape->drive;
3492 struct gendisk *g = tape->disk;
3494 BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
3496 drive->dsc_overlap = 0;
3497 drive->driver_data = NULL;
3498 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
3499 device_destroy(idetape_sysfs_class,
3500 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
3501 idetape_devs[tape->minor] = NULL;
3502 g->private_data = NULL;
3507 #ifdef CONFIG_IDE_PROC_FS
3508 static int proc_idetape_read_name
3509 (char *page, char **start, off_t off, int count, int *eof, void *data)
3511 ide_drive_t *drive = (ide_drive_t *) data;
3512 idetape_tape_t *tape = drive->driver_data;
3516 len = sprintf(out, "%s\n", tape->name);
3517 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
3520 static ide_proc_entry_t idetape_proc[] = {
3521 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
3522 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
3523 { NULL, 0, NULL, NULL }
3527 static int ide_tape_probe(ide_drive_t *);
3529 static ide_driver_t idetape_driver = {
3531 .owner = THIS_MODULE,
3533 .bus = &ide_bus_type,
3535 .probe = ide_tape_probe,
3536 .remove = ide_tape_remove,
3537 .version = IDETAPE_VERSION,
3539 .supports_dsc_overlap = 1,
3540 .do_request = idetape_do_request,
3541 .end_request = idetape_end_request,
3542 .error = __ide_error,
3543 .abort = __ide_abort,
3544 #ifdef CONFIG_IDE_PROC_FS
3545 .proc = idetape_proc,
3549 /* Our character device supporting functions, passed to register_chrdev. */
3550 static const struct file_operations idetape_fops = {
3551 .owner = THIS_MODULE,
3552 .read = idetape_chrdev_read,
3553 .write = idetape_chrdev_write,
3554 .ioctl = idetape_chrdev_ioctl,
3555 .open = idetape_chrdev_open,
3556 .release = idetape_chrdev_release,
3559 static int idetape_open(struct inode *inode, struct file *filp)
3561 struct gendisk *disk = inode->i_bdev->bd_disk;
3562 struct ide_tape_obj *tape;
3564 tape = ide_tape_get(disk);
3571 static int idetape_release(struct inode *inode, struct file *filp)
3573 struct gendisk *disk = inode->i_bdev->bd_disk;
3574 struct ide_tape_obj *tape = ide_tape_g(disk);
3581 static int idetape_ioctl(struct inode *inode, struct file *file,
3582 unsigned int cmd, unsigned long arg)
3584 struct block_device *bdev = inode->i_bdev;
3585 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
3586 ide_drive_t *drive = tape->drive;
3587 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
3589 err = idetape_blkdev_ioctl(drive, cmd, arg);
3593 static struct block_device_operations idetape_block_ops = {
3594 .owner = THIS_MODULE,
3595 .open = idetape_open,
3596 .release = idetape_release,
3597 .ioctl = idetape_ioctl,
3600 static int ide_tape_probe(ide_drive_t *drive)
3602 idetape_tape_t *tape;
3606 if (!strstr("ide-tape", drive->driver_req))
3608 if (!drive->present)
3610 if (drive->media != ide_tape)
3612 if (!idetape_identify_device(drive)) {
3613 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
3614 " the driver\n", drive->name);
3618 printk(KERN_INFO "ide-tape: passing drive %s to ide-scsi"
3619 " emulation.\n", drive->name);
3622 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
3624 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
3629 g = alloc_disk(1 << PARTN_BITS);
3633 ide_init_disk(g, drive);
3635 ide_proc_register_driver(drive, &idetape_driver);
3637 kref_init(&tape->kref);
3639 tape->drive = drive;
3640 tape->driver = &idetape_driver;
3643 g->private_data = &tape->driver;
3645 drive->driver_data = tape;
3647 mutex_lock(&idetape_ref_mutex);
3648 for (minor = 0; idetape_devs[minor]; minor++)
3650 idetape_devs[minor] = tape;
3651 mutex_unlock(&idetape_ref_mutex);
3653 idetape_setup(drive, tape, minor);
3655 device_create(idetape_sysfs_class, &drive->gendev,
3656 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name);
3657 device_create(idetape_sysfs_class, &drive->gendev,
3658 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name);
3660 g->fops = &idetape_block_ops;
3661 ide_register_region(g);
3671 static void __exit idetape_exit(void)
3673 driver_unregister(&idetape_driver.gen_driver);
3674 class_destroy(idetape_sysfs_class);
3675 unregister_chrdev(IDETAPE_MAJOR, "ht");
3678 static int __init idetape_init(void)
3681 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
3682 if (IS_ERR(idetape_sysfs_class)) {
3683 idetape_sysfs_class = NULL;
3684 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
3689 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
3690 printk(KERN_ERR "ide-tape: Failed to register chrdev"
3693 goto out_free_class;
3696 error = driver_register(&idetape_driver.gen_driver);
3698 goto out_free_driver;
3703 driver_unregister(&idetape_driver.gen_driver);
3705 class_destroy(idetape_sysfs_class);
3710 MODULE_ALIAS("ide:*m-tape*");
3711 module_init(idetape_init);
3712 module_exit(idetape_exit);
3713 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
3714 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
3715 MODULE_LICENSE("GPL");