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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Borislav Petkov5ce78af2008-02-02 19:56:48 +01002 * IDE ATAPI streaming tape driver.
3 *
Bartlomiej Zolnierkiewicz59bca8c2008-02-01 23:09:33 +01004 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * 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.
10 *
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Borislav Petkov5ce78af2008-02-02 19:56:48 +010014 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 */
17
18#define IDETAPE_VERSION "1.19"
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#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>
26#include <linux/mm.h>
27#include <linux/interrupt.h>
Marcelo Feitoza Parisi9bae1ff2006-03-28 01:56:46 -080028#include <linux/jiffies.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/major.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#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>
Arjan van de Vencf8b8972006-03-23 03:00:45 -080038#include <linux/mutex.h>
Borislav Petkov90699ce2008-02-02 19:56:50 +010039#include <scsi/scsi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#include <asm/byteorder.h>
42#include <asm/irq.h>
43#include <asm/uaccess.h>
44#include <asm/io.h>
45#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <linux/mtio.h>
47
Borislav Petkov8004a8c2008-02-06 02:57:51 +010048enum {
49 /* output errors only */
50 DBG_ERR = (1 << 0),
51 /* output all sense key/asc */
52 DBG_SENSE = (1 << 1),
53 /* info regarding all chrdev-related procedures */
54 DBG_CHRDEV = (1 << 2),
55 /* all remaining procedures */
56 DBG_PROCS = (1 << 3),
57 /* buffer alloc info (pc_stack & rq_stack) */
58 DBG_PCRQ_STACK = (1 << 4),
59};
60
61/* define to see debug info */
62#define IDETAPE_DEBUG_LOG 0
63
64#if IDETAPE_DEBUG_LOG
65#define debug_log(lvl, fmt, args...) \
66{ \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
69}
70#else
71#define debug_log(lvl, fmt, args...) do {} while (0)
72#endif
73
Linus Torvalds1da177e2005-04-16 15:20:36 -070074/**************************** Tunable parameters *****************************/
75
76
77/*
78 * Pipelined mode parameters.
79 *
80 * We try to use the minimum number of stages which is enough to
81 * keep the tape constantly streaming. To accomplish that, we implement
82 * a feedback loop around the maximum number of stages:
83 *
84 * We start from MIN maximum stages (we will not even use MIN stages
85 * if we don't need them), increment it by RATE*(MAX-MIN)
86 * whenever we sense that the pipeline is empty, until we reach
87 * the optimum value or until we reach MAX.
88 *
89 * Setting the following parameter to 0 is illegal: the pipelined mode
Borislav Petkov37016ba2008-02-06 02:57:52 +010090 * cannot be disabled (idetape_calculate_speeds() divides by
91 * tape->max_stages.)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 */
93#define IDETAPE_MIN_PIPELINE_STAGES 1
94#define IDETAPE_MAX_PIPELINE_STAGES 400
95#define IDETAPE_INCREASE_STAGES_RATE 20
96
97/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 * After each failed packet command we issue a request sense command
99 * and retry the packet command IDETAPE_MAX_PC_RETRIES times.
100 *
101 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
102 */
103#define IDETAPE_MAX_PC_RETRIES 3
104
105/*
106 * With each packet command, we allocate a buffer of
107 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
108 * commands (Not for READ/WRITE commands).
109 */
110#define IDETAPE_PC_BUFFER_SIZE 256
111
112/*
113 * In various places in the driver, we need to allocate storage
114 * for packet commands and requests, which will remain valid while
115 * we leave the driver to wait for an interrupt or a timeout event.
116 */
117#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
118
119/*
120 * Some drives (for example, Seagate STT3401A Travan) require a very long
121 * timeout, because they don't return an interrupt or clear their busy bit
122 * until after the command completes (even retension commands).
123 */
124#define IDETAPE_WAIT_CMD (900*HZ)
125
126/*
127 * The following parameter is used to select the point in the internal
128 * tape fifo in which we will start to refill the buffer. Decreasing
129 * the following parameter will improve the system's latency and
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200130 * interactive response, while using a high value might improve system
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 * throughput.
132 */
133#define IDETAPE_FIFO_THRESHOLD 2
134
135/*
136 * DSC polling parameters.
137 *
138 * Polling for DSC (a single bit in the status register) is a very
139 * important function in ide-tape. There are two cases in which we
140 * poll for DSC:
141 *
142 * 1. Before a read/write packet command, to ensure that we
143 * can transfer data from/to the tape's data buffers, without
144 * causing an actual media access. In case the tape is not
145 * ready yet, we take out our request from the device
146 * request queue, so that ide.c will service requests from
147 * the other device on the same interface meanwhile.
148 *
149 * 2. After the successful initialization of a "media access
150 * packet command", which is a command which can take a long
151 * time to complete (it can be several seconds or even an hour).
152 *
153 * Again, we postpone our request in the middle to free the bus
154 * for the other device. The polling frequency here should be
155 * lower than the read/write frequency since those media access
156 * commands are slow. We start from a "fast" frequency -
157 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
158 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
159 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
160 *
161 * We also set a timeout for the timer, in case something goes wrong.
162 * The timeout should be longer then the maximum execution time of a
163 * tape operation.
164 */
165
166/*
167 * DSC timings.
168 */
169#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
170#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
171#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
172#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
173#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
174#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
175#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
176
177/*************************** End of tunable parameters ***********************/
178
179/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 * Read/Write error simulation
181 */
182#define SIMULATE_ERRORS 0
183
184/*
185 * For general magnetic tape device compatibility.
186 */
187typedef enum {
188 idetape_direction_none,
189 idetape_direction_read,
190 idetape_direction_write
191} idetape_chrdev_direction_t;
192
193struct idetape_bh {
Stephen Rothwellab057962007-08-01 23:46:44 +0200194 u32 b_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 atomic_t b_count;
196 struct idetape_bh *b_reqnext;
197 char *b_data;
198};
199
200/*
201 * Our view of a packet command.
202 */
203typedef struct idetape_packet_command_s {
204 u8 c[12]; /* Actual packet bytes */
205 int retries; /* On each retry, we increment retries */
206 int error; /* Error code */
207 int request_transfer; /* Bytes to transfer */
208 int actually_transferred; /* Bytes actually transferred */
209 int buffer_size; /* Size of our data buffer */
210 struct idetape_bh *bh;
211 char *b_data;
212 int b_count;
213 u8 *buffer; /* Data buffer */
214 u8 *current_position; /* Pointer into the above buffer */
215 ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */
216 u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */
217 unsigned long flags; /* Status/Action bit flags: long for set_bit */
218} idetape_pc_t;
219
220/*
221 * Packet command flag bits.
222 */
223/* Set when an error is considered normal - We won't retry */
224#define PC_ABORT 0
225/* 1 When polling for DSC on a media access command */
226#define PC_WAIT_FOR_DSC 1
227/* 1 when we prefer to use DMA if possible */
228#define PC_DMA_RECOMMENDED 2
229/* 1 while DMA in progress */
230#define PC_DMA_IN_PROGRESS 3
231/* 1 when encountered problem during DMA */
232#define PC_DMA_ERROR 4
233/* Data direction */
234#define PC_WRITING 5
235
236/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 * A pipeline stage.
238 */
239typedef struct idetape_stage_s {
240 struct request rq; /* The corresponding request */
241 struct idetape_bh *bh; /* The data buffers */
242 struct idetape_stage_s *next; /* Pointer to the next stage */
243} idetape_stage_t;
244
245/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 * Most of our global data which we need to save even as we leave the
247 * driver due to an interrupt or a timer event is stored in a variable
248 * of type idetape_tape_t, defined below.
249 */
250typedef struct ide_tape_obj {
251 ide_drive_t *drive;
252 ide_driver_t *driver;
253 struct gendisk *disk;
254 struct kref kref;
255
256 /*
257 * Since a typical character device operation requires more
258 * than one packet command, we provide here enough memory
259 * for the maximum of interconnected packet commands.
260 * The packet commands are stored in the circular array pc_stack.
261 * pc_stack_index points to the last used entry, and warps around
262 * to the start when we get to the last array entry.
263 *
264 * pc points to the current processed packet command.
265 *
266 * failed_pc points to the last failed packet command, or contains
267 * NULL if we do not need to retry any packet command. This is
268 * required since an additional packet command is needed before the
269 * retry, to get detailed information on what went wrong.
270 */
271 /* Current packet command */
272 idetape_pc_t *pc;
273 /* Last failed packet command */
274 idetape_pc_t *failed_pc;
275 /* Packet command stack */
276 idetape_pc_t pc_stack[IDETAPE_PC_STACK];
277 /* Next free packet command storage space */
278 int pc_stack_index;
279 struct request rq_stack[IDETAPE_PC_STACK];
280 /* We implement a circular array */
281 int rq_stack_index;
282
283 /*
284 * DSC polling variables.
285 *
286 * While polling for DSC we use postponed_rq to postpone the
287 * current request so that ide.c will be able to service
288 * pending requests on the other device. Note that at most
289 * we will have only one DSC (usually data transfer) request
290 * in the device request queue. Additional requests can be
291 * queued in our internal pipeline, but they will be visible
292 * to ide.c only one at a time.
293 */
294 struct request *postponed_rq;
295 /* The time in which we started polling for DSC */
296 unsigned long dsc_polling_start;
297 /* Timer used to poll for dsc */
298 struct timer_list dsc_timer;
299 /* Read/Write dsc polling frequency */
300 unsigned long best_dsc_rw_frequency;
301 /* The current polling frequency */
302 unsigned long dsc_polling_frequency;
303 /* Maximum waiting time */
304 unsigned long dsc_timeout;
305
306 /*
307 * Read position information
308 */
309 u8 partition;
310 /* Current block */
311 unsigned int first_frame_position;
312 unsigned int last_frame_position;
313 unsigned int blocks_in_buffer;
314
315 /*
316 * Last error information
317 */
318 u8 sense_key, asc, ascq;
319
320 /*
321 * Character device operation
322 */
323 unsigned int minor;
324 /* device name */
325 char name[4];
326 /* Current character device data transfer direction */
327 idetape_chrdev_direction_t chrdev_direction;
328
329 /*
330 * Device information
331 */
332 /* Usually 512 or 1024 bytes */
333 unsigned short tape_block_size;
334 int user_bs_factor;
Borislav Petkovb6422012008-02-02 19:56:49 +0100335
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 /* Copy of the tape's Capabilities and Mechanical Page */
Borislav Petkovb6422012008-02-02 19:56:49 +0100337 u8 caps[20];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339 /*
340 * Active data transfer request parameters.
341 *
342 * At most, there is only one ide-tape originated data transfer
343 * request in the device request queue. This allows ide.c to
344 * easily service requests from the other device when we
345 * postpone our active request. In the pipelined operation
346 * mode, we use our internal pipeline structure to hold
347 * more data requests.
348 *
349 * The data buffer size is chosen based on the tape's
350 * recommendation.
351 */
352 /* Pointer to the request which is waiting in the device request queue */
353 struct request *active_data_request;
354 /* Data buffer size (chosen based on the tape's recommendation */
355 int stage_size;
356 idetape_stage_t *merge_stage;
357 int merge_stage_size;
358 struct idetape_bh *bh;
359 char *b_data;
360 int b_count;
361
362 /*
363 * Pipeline parameters.
364 *
365 * To accomplish non-pipelined mode, we simply set the following
366 * variables to zero (or NULL, where appropriate).
367 */
368 /* Number of currently used stages */
369 int nr_stages;
370 /* Number of pending stages */
371 int nr_pending_stages;
372 /* We will not allocate more than this number of stages */
373 int max_stages, min_pipeline, max_pipeline;
374 /* The first stage which will be removed from the pipeline */
375 idetape_stage_t *first_stage;
376 /* The currently active stage */
377 idetape_stage_t *active_stage;
378 /* Will be serviced after the currently active request */
379 idetape_stage_t *next_stage;
380 /* New requests will be added to the pipeline here */
381 idetape_stage_t *last_stage;
382 /* Optional free stage which we can use */
383 idetape_stage_t *cache_stage;
384 int pages_per_stage;
385 /* Wasted space in each stage */
386 int excess_bh_size;
387
388 /* Status/Action flags: long for set_bit */
389 unsigned long flags;
390 /* protects the ide-tape queue */
391 spinlock_t spinlock;
392
393 /*
394 * Measures average tape speed
395 */
396 unsigned long avg_time;
397 int avg_size;
398 int avg_speed;
399
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 char vendor_id[10];
401 char product_id[18];
402 char firmware_revision[6];
403 int firmware_revision_num;
404
405 /* the door is currently locked */
406 int door_locked;
407 /* the tape hardware is write protected */
408 char drv_write_prot;
409 /* the tape is write protected (hardware or opened as read-only) */
410 char write_prot;
411
412 /*
413 * Limit the number of times a request can
414 * be postponed, to avoid an infinite postpone
415 * deadlock.
416 */
417 /* request postpone count limit */
418 int postpone_cnt;
419
420 /*
421 * Measures number of frames:
422 *
423 * 1. written/read to/from the driver pipeline (pipeline_head).
424 * 2. written/read to/from the tape buffers (idetape_bh).
425 * 3. written/read by the tape to/from the media (tape_head).
426 */
427 int pipeline_head;
428 int buffer_head;
429 int tape_head;
430 int last_tape_head;
431
432 /*
433 * Speed control at the tape buffers input/output
434 */
435 unsigned long insert_time;
436 int insert_size;
437 int insert_speed;
438 int max_insert_speed;
439 int measure_insert_time;
440
441 /*
442 * Measure tape still time, in milliseconds
443 */
444 unsigned long tape_still_time_begin;
445 int tape_still_time;
446
447 /*
448 * Speed regulation negative feedback loop
449 */
450 int speed_control;
451 int pipeline_head_speed;
452 int controlled_pipeline_head_speed;
453 int uncontrolled_pipeline_head_speed;
454 int controlled_last_pipeline_head;
455 int uncontrolled_last_pipeline_head;
456 unsigned long uncontrolled_pipeline_head_time;
457 unsigned long controlled_pipeline_head_time;
458 int controlled_previous_pipeline_head;
459 int uncontrolled_previous_pipeline_head;
460 unsigned long controlled_previous_head_time;
461 unsigned long uncontrolled_previous_head_time;
462 int restart_speed_control_req;
463
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100464 u32 debug_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465} idetape_tape_t;
466
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800467static DEFINE_MUTEX(idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
Will Dysond5dee802005-09-16 02:55:07 -0700469static struct class *idetape_sysfs_class;
470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
472
473#define ide_tape_g(disk) \
474 container_of((disk)->private_data, struct ide_tape_obj, driver)
475
476static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
477{
478 struct ide_tape_obj *tape = NULL;
479
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800480 mutex_lock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 tape = ide_tape_g(disk);
482 if (tape)
483 kref_get(&tape->kref);
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800484 mutex_unlock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 return tape;
486}
487
488static void ide_tape_release(struct kref *);
489
490static void ide_tape_put(struct ide_tape_obj *tape)
491{
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800492 mutex_lock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 kref_put(&tape->kref, ide_tape_release);
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800494 mutex_unlock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495}
496
497/*
498 * Tape door status
499 */
500#define DOOR_UNLOCKED 0
501#define DOOR_LOCKED 1
502#define DOOR_EXPLICITLY_LOCKED 2
503
504/*
505 * Tape flag bits values.
506 */
507#define IDETAPE_IGNORE_DSC 0
508#define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
509#define IDETAPE_BUSY 2 /* Device already opened */
510#define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
511#define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
512#define IDETAPE_FILEMARK 5 /* Currently on a filemark */
513#define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
514#define IDETAPE_READ_ERROR 7
515#define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
516/* 0 = no tape is loaded, so we don't rewind after ejecting */
517#define IDETAPE_MEDIUM_PRESENT 9
518
519/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 * Some defines for the READ BUFFER command
521 */
522#define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
523
524/*
525 * Some defines for the SPACE command
526 */
527#define IDETAPE_SPACE_OVER_FILEMARK 1
528#define IDETAPE_SPACE_TO_EOD 3
529
530/*
531 * Some defines for the LOAD UNLOAD command
532 */
533#define IDETAPE_LU_LOAD_MASK 1
534#define IDETAPE_LU_RETENSION_MASK 2
535#define IDETAPE_LU_EOT_MASK 4
536
537/*
538 * Special requests for our block device strategy routine.
539 *
540 * In order to service a character device command, we add special
541 * requests to the tail of our block device request queue and wait
542 * for their completion.
543 */
544
545enum {
546 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
547 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
548 REQ_IDETAPE_READ = (1 << 2),
549 REQ_IDETAPE_WRITE = (1 << 3),
550 REQ_IDETAPE_READ_BUFFER = (1 << 4),
551};
552
553/*
554 * Error codes which are returned in rq->errors to the higher part
555 * of the driver.
556 */
557#define IDETAPE_ERROR_GENERAL 101
558#define IDETAPE_ERROR_FILEMARK 102
559#define IDETAPE_ERROR_EOD 103
560
561/*
562 * The following is used to format the general configuration word of
563 * the ATAPI IDENTIFY DEVICE command.
564 */
565struct idetape_id_gcw {
566 unsigned packet_size :2; /* Packet Size */
567 unsigned reserved234 :3; /* Reserved */
568 unsigned drq_type :2; /* Command packet DRQ type */
569 unsigned removable :1; /* Removable media */
570 unsigned device_type :5; /* Device type */
571 unsigned reserved13 :1; /* Reserved */
572 unsigned protocol :2; /* Protocol type */
573};
574
Borislav Petkovfa366252008-02-02 19:56:51 +0100575/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576#define IDETAPE_BLOCK_DESCRIPTOR 0
577#define IDETAPE_CAPABILITIES_PAGE 0x2a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 * The variables below are used for the character device interface.
581 * Additional state variables are defined in our ide_drive_t structure.
582 */
583static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES];
584
585#define ide_tape_f(file) ((file)->private_data)
586
587static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
588{
589 struct ide_tape_obj *tape = NULL;
590
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800591 mutex_lock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 tape = idetape_devs[i];
593 if (tape)
594 kref_get(&tape->kref);
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800595 mutex_unlock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 return tape;
597}
598
599/*
600 * Function declarations
601 *
602 */
603static int idetape_chrdev_release (struct inode *inode, struct file *filp);
604static void idetape_write_release (ide_drive_t *drive, unsigned int minor);
605
606/*
607 * Too bad. The drive wants to send us data which we are not ready to accept.
608 * Just throw it away.
609 */
610static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount)
611{
612 while (bcount--)
613 (void) HWIF(drive)->INB(IDE_DATA_REG);
614}
615
616static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
617{
618 struct idetape_bh *bh = pc->bh;
619 int count;
620
621 while (bcount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 if (bh == NULL) {
623 printk(KERN_ERR "ide-tape: bh == NULL in "
624 "idetape_input_buffers\n");
625 idetape_discard_data(drive, bcount);
626 return;
627 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount);
629 HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count);
630 bcount -= count;
631 atomic_add(count, &bh->b_count);
632 if (atomic_read(&bh->b_count) == bh->b_size) {
633 bh = bh->b_reqnext;
634 if (bh)
635 atomic_set(&bh->b_count, 0);
636 }
637 }
638 pc->bh = bh;
639}
640
641static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
642{
643 struct idetape_bh *bh = pc->bh;
644 int count;
645
646 while (bcount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 if (bh == NULL) {
648 printk(KERN_ERR "ide-tape: bh == NULL in "
649 "idetape_output_buffers\n");
650 return;
651 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
653 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
654 bcount -= count;
655 pc->b_data += count;
656 pc->b_count -= count;
657 if (!pc->b_count) {
658 pc->bh = bh = bh->b_reqnext;
659 if (bh) {
660 pc->b_data = bh->b_data;
661 pc->b_count = atomic_read(&bh->b_count);
662 }
663 }
664 }
665}
666
667static void idetape_update_buffers (idetape_pc_t *pc)
668{
669 struct idetape_bh *bh = pc->bh;
670 int count;
671 unsigned int bcount = pc->actually_transferred;
672
673 if (test_bit(PC_WRITING, &pc->flags))
674 return;
675 while (bcount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 if (bh == NULL) {
677 printk(KERN_ERR "ide-tape: bh == NULL in "
678 "idetape_update_buffers\n");
679 return;
680 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
682 atomic_set(&bh->b_count, count);
683 if (atomic_read(&bh->b_count) == bh->b_size)
684 bh = bh->b_reqnext;
685 bcount -= count;
686 }
687 pc->bh = bh;
688}
689
690/*
691 * idetape_next_pc_storage returns a pointer to a place in which we can
692 * safely store a packet command, even though we intend to leave the
693 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
694 * commands is allocated at initialization time.
695 */
696static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive)
697{
698 idetape_tape_t *tape = drive->driver_data;
699
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100700 debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index);
701
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 if (tape->pc_stack_index == IDETAPE_PC_STACK)
703 tape->pc_stack_index=0;
704 return (&tape->pc_stack[tape->pc_stack_index++]);
705}
706
707/*
708 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
709 * Since we queue packet commands in the request queue, we need to
710 * allocate a request, along with the allocation of a packet command.
711 */
712
713/**************************************************************
714 * *
715 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
716 * followed later on by kfree(). -ml *
717 * *
718 **************************************************************/
719
720static struct request *idetape_next_rq_storage (ide_drive_t *drive)
721{
722 idetape_tape_t *tape = drive->driver_data;
723
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100724 debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index);
725
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 if (tape->rq_stack_index == IDETAPE_PC_STACK)
727 tape->rq_stack_index=0;
728 return (&tape->rq_stack[tape->rq_stack_index++]);
729}
730
731/*
732 * idetape_init_pc initializes a packet command.
733 */
734static void idetape_init_pc (idetape_pc_t *pc)
735{
736 memset(pc->c, 0, 12);
737 pc->retries = 0;
738 pc->flags = 0;
739 pc->request_transfer = 0;
740 pc->buffer = pc->pc_buffer;
741 pc->buffer_size = IDETAPE_PC_BUFFER_SIZE;
742 pc->bh = NULL;
743 pc->b_data = NULL;
744}
745
746/*
Borislav Petkov1b5db432008-02-02 19:56:48 +0100747 * called on each failed packet command retry to analyze the request sense. We
748 * currently do not utilize this information.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 */
Borislav Petkov1b5db432008-02-02 19:56:48 +0100750static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751{
752 idetape_tape_t *tape = drive->driver_data;
753 idetape_pc_t *pc = tape->failed_pc;
754
Borislav Petkov1b5db432008-02-02 19:56:48 +0100755 tape->sense_key = sense[2] & 0xF;
756 tape->asc = sense[12];
757 tape->ascq = sense[13];
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100758
759 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
760 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
Borislav Petkov1b5db432008-02-02 19:56:48 +0100762 /* Correct pc->actually_transferred by asking the tape. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 if (test_bit(PC_DMA_ERROR, &pc->flags)) {
Borislav Petkov1b5db432008-02-02 19:56:48 +0100764 pc->actually_transferred = pc->request_transfer -
765 tape->tape_block_size *
Borislav Petkov860ff5e2008-02-02 19:56:50 +0100766 be32_to_cpu(get_unaligned((u32 *)&sense[3]));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 idetape_update_buffers(pc);
768 }
769
770 /*
771 * If error was the result of a zero-length read or write command,
772 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
773 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
774 */
Borislav Petkov90699ce2008-02-02 19:56:50 +0100775 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
Borislav Petkov1b5db432008-02-02 19:56:48 +0100776 /* length == 0 */
777 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
778 if (tape->sense_key == 5) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 /* don't report an error, everything's ok */
780 pc->error = 0;
781 /* don't retry read/write */
782 set_bit(PC_ABORT, &pc->flags);
783 }
784 }
Borislav Petkov90699ce2008-02-02 19:56:50 +0100785 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 pc->error = IDETAPE_ERROR_FILEMARK;
787 set_bit(PC_ABORT, &pc->flags);
788 }
Borislav Petkov90699ce2008-02-02 19:56:50 +0100789 if (pc->c[0] == WRITE_6) {
Borislav Petkov1b5db432008-02-02 19:56:48 +0100790 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
791 && tape->asc == 0x0 && tape->ascq == 0x2)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 pc->error = IDETAPE_ERROR_EOD;
793 set_bit(PC_ABORT, &pc->flags);
794 }
795 }
Borislav Petkov90699ce2008-02-02 19:56:50 +0100796 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
Borislav Petkov1b5db432008-02-02 19:56:48 +0100797 if (tape->sense_key == 8) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 pc->error = IDETAPE_ERROR_EOD;
799 set_bit(PC_ABORT, &pc->flags);
800 }
801 if (!test_bit(PC_ABORT, &pc->flags) &&
802 pc->actually_transferred)
803 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
804 }
805}
806
Borislav Petkov419d4742008-02-02 19:56:51 +0100807static void idetape_activate_next_stage(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808{
809 idetape_tape_t *tape = drive->driver_data;
810 idetape_stage_t *stage = tape->next_stage;
811 struct request *rq = &stage->rq;
812
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100813 debug_log(DBG_PROCS, "Enter %s\n", __func__);
814
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 if (stage == NULL) {
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100816 printk(KERN_ERR "ide-tape: bug: Trying to activate a non"
817 " existing stage\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 return;
819 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
821 rq->rq_disk = tape->disk;
822 rq->buffer = NULL;
823 rq->special = (void *)stage->bh;
824 tape->active_data_request = rq;
825 tape->active_stage = stage;
826 tape->next_stage = stage->next;
827}
828
829/*
830 * idetape_increase_max_pipeline_stages is a part of the feedback
831 * loop which tries to find the optimum number of stages. In the
832 * feedback loop, we are starting from a minimum maximum number of
833 * stages, and if we sense that the pipeline is empty, we try to
834 * increase it, until we reach the user compile time memory limit.
835 */
836static void idetape_increase_max_pipeline_stages (ide_drive_t *drive)
837{
838 idetape_tape_t *tape = drive->driver_data;
839 int increase = (tape->max_pipeline - tape->min_pipeline) / 10;
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100840
841 debug_log(DBG_PROCS, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
843 tape->max_stages += max(increase, 1);
844 tape->max_stages = max(tape->max_stages, tape->min_pipeline);
845 tape->max_stages = min(tape->max_stages, tape->max_pipeline);
846}
847
848/*
849 * idetape_kfree_stage calls kfree to completely free a stage, along with
850 * its related buffers.
851 */
852static void __idetape_kfree_stage (idetape_stage_t *stage)
853{
854 struct idetape_bh *prev_bh, *bh = stage->bh;
855 int size;
856
857 while (bh != NULL) {
858 if (bh->b_data != NULL) {
859 size = (int) bh->b_size;
860 while (size > 0) {
861 free_page((unsigned long) bh->b_data);
862 size -= PAGE_SIZE;
863 bh->b_data += PAGE_SIZE;
864 }
865 }
866 prev_bh = bh;
867 bh = bh->b_reqnext;
868 kfree(prev_bh);
869 }
870 kfree(stage);
871}
872
873static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage)
874{
875 __idetape_kfree_stage(stage);
876}
877
878/*
879 * idetape_remove_stage_head removes tape->first_stage from the pipeline.
880 * The caller should avoid race conditions.
881 */
882static void idetape_remove_stage_head (ide_drive_t *drive)
883{
884 idetape_tape_t *tape = drive->driver_data;
885 idetape_stage_t *stage;
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100886
887 debug_log(DBG_PROCS, "Enter %s\n", __func__);
888
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 if (tape->first_stage == NULL) {
890 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
Borislav Petkov55a5d292008-02-02 19:56:49 +0100891 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 }
893 if (tape->active_stage == tape->first_stage) {
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100894 printk(KERN_ERR "ide-tape: bug: Trying to free our active "
895 "pipeline stage\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 return;
897 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 stage = tape->first_stage;
899 tape->first_stage = stage->next;
900 idetape_kfree_stage(tape, stage);
901 tape->nr_stages--;
902 if (tape->first_stage == NULL) {
903 tape->last_stage = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 if (tape->next_stage != NULL)
905 printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n");
906 if (tape->nr_stages)
907 printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 }
909}
910
911/*
912 * This will free all the pipeline stages starting from new_last_stage->next
913 * to the end of the list, and point tape->last_stage to new_last_stage.
914 */
915static void idetape_abort_pipeline(ide_drive_t *drive,
916 idetape_stage_t *new_last_stage)
917{
918 idetape_tape_t *tape = drive->driver_data;
919 idetape_stage_t *stage = new_last_stage->next;
920 idetape_stage_t *nstage;
921
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100922 debug_log(DBG_PROCS, "%s: Enter %s\n", tape->name, __func__);
923
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 while (stage) {
925 nstage = stage->next;
926 idetape_kfree_stage(tape, stage);
927 --tape->nr_stages;
928 --tape->nr_pending_stages;
929 stage = nstage;
930 }
931 if (new_last_stage)
932 new_last_stage->next = NULL;
933 tape->last_stage = new_last_stage;
934 tape->next_stage = NULL;
935}
936
937/*
938 * idetape_end_request is used to finish servicing a request, and to
939 * insert a pending pipeline request into the main device queue.
940 */
941static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
942{
943 struct request *rq = HWGROUP(drive)->rq;
944 idetape_tape_t *tape = drive->driver_data;
945 unsigned long flags;
946 int error;
947 int remove_stage = 0;
948 idetape_stage_t *active_stage;
949
Borislav Petkov8004a8c2008-02-06 02:57:51 +0100950 debug_log(DBG_PROCS, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951
952 switch (uptodate) {
953 case 0: error = IDETAPE_ERROR_GENERAL; break;
954 case 1: error = 0; break;
955 default: error = uptodate;
956 }
957 rq->errors = error;
958 if (error)
959 tape->failed_pc = NULL;
960
Bartlomiej Zolnierkiewicz36872212008-01-26 20:13:10 +0100961 if (!blk_special_request(rq)) {
962 ide_end_request(drive, uptodate, nr_sects);
963 return 0;
964 }
965
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 spin_lock_irqsave(&tape->spinlock, flags);
967
968 /* The request was a pipelined data transfer request */
969 if (tape->active_data_request == rq) {
970 active_stage = tape->active_stage;
971 tape->active_stage = NULL;
972 tape->active_data_request = NULL;
973 tape->nr_pending_stages--;
974 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
975 remove_stage = 1;
976 if (error) {
977 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
978 if (error == IDETAPE_ERROR_EOD)
979 idetape_abort_pipeline(drive, active_stage);
980 }
981 } else if (rq->cmd[0] & REQ_IDETAPE_READ) {
982 if (error == IDETAPE_ERROR_EOD) {
983 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
984 idetape_abort_pipeline(drive, active_stage);
985 }
986 }
987 if (tape->next_stage != NULL) {
Borislav Petkov419d4742008-02-02 19:56:51 +0100988 idetape_activate_next_stage(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
990 /*
991 * Insert the next request into the request queue.
992 */
993 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
994 } else if (!error) {
995 idetape_increase_max_pipeline_stages(drive);
996 }
997 }
998 ide_end_drive_cmd(drive, 0, 0);
999// blkdev_dequeue_request(rq);
1000// drive->rq = NULL;
1001// end_that_request_last(rq);
1002
1003 if (remove_stage)
1004 idetape_remove_stage_head(drive);
1005 if (tape->active_data_request == NULL)
1006 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
1007 spin_unlock_irqrestore(&tape->spinlock, flags);
1008 return 0;
1009}
1010
1011static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive)
1012{
1013 idetape_tape_t *tape = drive->driver_data;
1014
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001015 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1016
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 if (!tape->pc->error) {
Borislav Petkov1b5db432008-02-02 19:56:48 +01001018 idetape_analyze_error(drive, tape->pc->buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 idetape_end_request(drive, 1, 0);
1020 } else {
1021 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
1022 idetape_end_request(drive, 0, 0);
1023 }
1024 return ide_stopped;
1025}
1026
1027static void idetape_create_request_sense_cmd (idetape_pc_t *pc)
1028{
1029 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001030 pc->c[0] = REQUEST_SENSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 pc->c[4] = 20;
1032 pc->request_transfer = 20;
1033 pc->callback = &idetape_request_sense_callback;
1034}
1035
1036static void idetape_init_rq(struct request *rq, u8 cmd)
1037{
1038 memset(rq, 0, sizeof(*rq));
Jens Axboe4aff5e22006-08-10 08:44:47 +02001039 rq->cmd_type = REQ_TYPE_SPECIAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 rq->cmd[0] = cmd;
1041}
1042
1043/*
1044 * idetape_queue_pc_head generates a new packet command request in front
1045 * of the request queue, before the current request, so that it will be
1046 * processed immediately, on the next pass through the driver.
1047 *
1048 * idetape_queue_pc_head is called from the request handling part of
1049 * the driver (the "bottom" part). Safe storage for the request should
1050 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
1051 * before calling idetape_queue_pc_head.
1052 *
1053 * Memory for those requests is pre-allocated at initialization time, and
1054 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
1055 * space for the maximum possible number of inter-dependent packet commands.
1056 *
1057 * The higher level of the driver - The ioctl handler and the character
1058 * device handling functions should queue request to the lower level part
1059 * and wait for their completion using idetape_queue_pc_tail or
1060 * idetape_queue_rw_tail.
1061 */
1062static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq)
1063{
1064 struct ide_tape_obj *tape = drive->driver_data;
1065
1066 idetape_init_rq(rq, REQ_IDETAPE_PC1);
1067 rq->buffer = (char *) pc;
1068 rq->rq_disk = tape->disk;
1069 (void) ide_do_drive_cmd(drive, rq, ide_preempt);
1070}
1071
1072/*
1073 * idetape_retry_pc is called when an error was detected during the
1074 * last packet command. We queue a request sense packet command in
1075 * the head of the request list.
1076 */
1077static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
1078{
1079 idetape_tape_t *tape = drive->driver_data;
1080 idetape_pc_t *pc;
1081 struct request *rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082
Bartlomiej Zolnierkiewicz64a57fe2008-02-06 02:57:51 +01001083 (void)ide_read_error(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 pc = idetape_next_pc_storage(drive);
1085 rq = idetape_next_rq_storage(drive);
1086 idetape_create_request_sense_cmd(pc);
1087 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1088 idetape_queue_pc_head(drive, pc, rq);
1089 return ide_stopped;
1090}
1091
1092/*
1093 * idetape_postpone_request postpones the current request so that
1094 * ide.c will be able to service requests from another device on
1095 * the same hwgroup while we are polling for DSC.
1096 */
1097static void idetape_postpone_request (ide_drive_t *drive)
1098{
1099 idetape_tape_t *tape = drive->driver_data;
1100
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001101 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1102
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 tape->postponed_rq = HWGROUP(drive)->rq;
1104 ide_stall_queue(drive, tape->dsc_polling_frequency);
1105}
1106
1107/*
1108 * idetape_pc_intr is the usual interrupt handler which will be called
1109 * during a packet command. We will transfer some of the data (as
1110 * requested by the drive) and will re-point interrupt handler to us.
1111 * When data transfer is finished, we will act according to the
1112 * algorithm described before idetape_issue_packet_command.
1113 *
1114 */
1115static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
1116{
1117 ide_hwif_t *hwif = drive->hwif;
1118 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 idetape_pc_t *pc = tape->pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 unsigned int temp;
1121#if SIMULATE_ERRORS
1122 static int error_sim_count = 0;
1123#endif
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001124 u16 bcount;
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +01001125 u8 stat, ireason;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001127 debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128
1129 /* Clear the interrupt */
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +01001130 stat = ide_read_status(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131
1132 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001133 if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 /*
1135 * A DMA error is sometimes expected. For example,
1136 * if the tape is crossing a filemark during a
1137 * READ command, it will issue an irq and position
1138 * itself before the filemark, so that only a partial
1139 * data transfer will occur (which causes the DMA
1140 * error). In that case, we will later ask the tape
1141 * how much bytes of the original request were
1142 * actually transferred (we can't receive that
1143 * information from the DMA engine on most chipsets).
1144 */
1145
1146 /*
1147 * On the contrary, a DMA error is never expected;
1148 * it usually indicates a hardware error or abort.
1149 * If the tape crosses a filemark during a READ
1150 * command, it will issue an irq and position itself
1151 * after the filemark (not before). Only a partial
1152 * data transfer will occur, but no DMA error.
1153 * (AS, 19 Apr 2001)
1154 */
1155 set_bit(PC_DMA_ERROR, &pc->flags);
1156 } else {
1157 pc->actually_transferred = pc->request_transfer;
1158 idetape_update_buffers(pc);
1159 }
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001160 debug_log(DBG_PROCS, "DMA finished\n");
1161
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 }
1163
1164 /* No more interrupts */
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001165 if ((stat & DRQ_STAT) == 0) {
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001166 debug_log(DBG_SENSE, "Packet command completed, %d bytes"
1167 " transferred\n", pc->actually_transferred);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001169 clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 local_irq_enable();
1171
1172#if SIMULATE_ERRORS
Borislav Petkov90699ce2008-02-02 19:56:50 +01001173 if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 (++error_sim_count % 100) == 0) {
1175 printk(KERN_INFO "ide-tape: %s: simulating error\n",
1176 tape->name);
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001177 stat |= ERR_STAT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 }
1179#endif
Borislav Petkov90699ce2008-02-02 19:56:50 +01001180 if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001181 stat &= ~ERR_STAT;
1182 if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) {
1183 /* Error detected */
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001184 debug_log(DBG_ERR, "%s: I/O error\n", tape->name);
1185
Borislav Petkov90699ce2008-02-02 19:56:50 +01001186 if (pc->c[0] == REQUEST_SENSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 printk(KERN_ERR "ide-tape: I/O error in request sense command\n");
1188 return ide_do_reset(drive);
1189 }
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001190 debug_log(DBG_ERR, "[cmd %x]: check condition\n",
1191 pc->c[0]);
1192
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 /* Retry operation */
1194 return idetape_retry_pc(drive);
1195 }
1196 pc->error = 0;
1197 if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) &&
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001198 (stat & SEEK_STAT) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 /* Media access command */
1200 tape->dsc_polling_start = jiffies;
1201 tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST;
1202 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
1203 /* Allow ide.c to handle other requests */
1204 idetape_postpone_request(drive);
1205 return ide_stopped;
1206 }
1207 if (tape->failed_pc == pc)
1208 tape->failed_pc = NULL;
1209 /* Command finished - Call the callback function */
1210 return pc->callback(drive);
1211 }
1212 if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1213 printk(KERN_ERR "ide-tape: The tape wants to issue more "
1214 "interrupts in DMA mode\n");
1215 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +01001216 ide_dma_off(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 return ide_do_reset(drive);
1218 }
1219 /* Get the number of bytes to transfer on this interrupt. */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001220 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) |
1221 hwif->INB(IDE_BCOUNTL_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +01001223 ireason = hwif->INB(IDE_IREASON_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +01001225 if (ireason & CD) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n");
1227 return ide_do_reset(drive);
1228 }
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +01001229 if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 /* Hopefully, we will never get here */
1231 printk(KERN_ERR "ide-tape: We wanted to %s, ",
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +01001232 (ireason & IO) ? "Write" : "Read");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +01001234 (ireason & IO) ? "Read" : "Write");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 return ide_do_reset(drive);
1236 }
1237 if (!test_bit(PC_WRITING, &pc->flags)) {
1238 /* Reading - Check that we have enough space */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001239 temp = pc->actually_transferred + bcount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 if (temp > pc->request_transfer) {
1241 if (temp > pc->buffer_size) {
1242 printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n");
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001243 idetape_discard_data(drive, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1245 return ide_started;
1246 }
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001247 debug_log(DBG_SENSE, "The tape wants to send us more "
1248 "data than expected - allowing transfer\n");
1249
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 }
1251 }
1252 if (test_bit(PC_WRITING, &pc->flags)) {
1253 if (pc->bh != NULL)
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001254 idetape_output_buffers(drive, pc, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 else
1256 /* Write the current buffer */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001257 hwif->atapi_output_bytes(drive, pc->current_position,
1258 bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 } else {
1260 if (pc->bh != NULL)
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001261 idetape_input_buffers(drive, pc, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 else
1263 /* Read the current buffer */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001264 hwif->atapi_input_bytes(drive, pc->current_position,
1265 bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 }
1267 /* Update the current position */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001268 pc->actually_transferred += bcount;
1269 pc->current_position += bcount;
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001270
1271 debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n",
1272 pc->c[0], bcount);
1273
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 /* And set the interrupt handler again */
1275 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1276 return ide_started;
1277}
1278
1279/*
1280 * Packet Command Interface
1281 *
1282 * The current Packet Command is available in tape->pc, and will not
1283 * change until we finish handling it. Each packet command is associated
1284 * with a callback function that will be called when the command is
1285 * finished.
1286 *
1287 * The handling will be done in three stages:
1288 *
1289 * 1. idetape_issue_packet_command will send the packet command to the
1290 * drive, and will set the interrupt handler to idetape_pc_intr.
1291 *
1292 * 2. On each interrupt, idetape_pc_intr will be called. This step
1293 * will be repeated until the device signals us that no more
1294 * interrupts will be issued.
1295 *
1296 * 3. ATAPI Tape media access commands have immediate status with a
1297 * delayed process. In case of a successful initiation of a
1298 * media access packet command, the DSC bit will be set when the
1299 * actual execution of the command is finished.
1300 * Since the tape drive will not issue an interrupt, we have to
1301 * poll for this event. In this case, we define the request as
1302 * "low priority request" by setting rq_status to
1303 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
1304 * the driver.
1305 *
1306 * ide.c will then give higher priority to requests which
1307 * originate from the other device, until will change rq_status
1308 * to RQ_ACTIVE.
1309 *
1310 * 4. When the packet command is finished, it will be checked for errors.
1311 *
1312 * 5. In case an error was found, we queue a request sense packet
1313 * command in front of the request queue and retry the operation
1314 * up to IDETAPE_MAX_PC_RETRIES times.
1315 *
1316 * 6. In case no error was found, or we decided to give up and not
1317 * to retry again, the callback function will be called and then
1318 * we will handle the next request.
1319 *
1320 */
1321static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
1322{
1323 ide_hwif_t *hwif = drive->hwif;
1324 idetape_tape_t *tape = drive->driver_data;
1325 idetape_pc_t *pc = tape->pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 int retries = 100;
1327 ide_startstop_t startstop;
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +01001328 u8 ireason;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329
1330 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
1331 printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
1332 return startstop;
1333 }
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +01001334 ireason = hwif->INB(IDE_IREASON_REG);
1335 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
1337 "a packet command, retrying\n");
1338 udelay(100);
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +01001339 ireason = hwif->INB(IDE_IREASON_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 if (retries == 0) {
1341 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
1342 "issuing a packet command, ignoring\n");
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +01001343 ireason |= CD;
1344 ireason &= ~IO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 }
1346 }
Bartlomiej Zolnierkiewicz8e7657a2008-01-25 22:17:12 +01001347 if ((ireason & CD) == 0 || (ireason & IO)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
1349 "a packet command\n");
1350 return ide_do_reset(drive);
1351 }
1352 /* Set the interrupt routine */
1353 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1354#ifdef CONFIG_BLK_DEV_IDEDMA
1355 /* Begin DMA, if necessary */
1356 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags))
1357 hwif->dma_start(drive);
1358#endif
1359 /* Send the actual packet */
1360 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
1361 return ide_started;
1362}
1363
1364static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc)
1365{
1366 ide_hwif_t *hwif = drive->hwif;
1367 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 int dma_ok = 0;
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001369 u16 bcount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370
Borislav Petkov90699ce2008-02-02 19:56:50 +01001371 if (tape->pc->c[0] == REQUEST_SENSE &&
1372 pc->c[0] == REQUEST_SENSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
1374 "Two request sense in serial were issued\n");
1375 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376
Borislav Petkov90699ce2008-02-02 19:56:50 +01001377 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 tape->failed_pc = pc;
1379 /* Set the current packet command */
1380 tape->pc = pc;
1381
1382 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
1383 test_bit(PC_ABORT, &pc->flags)) {
1384 /*
1385 * We will "abort" retrying a packet command in case
1386 * a legitimate error code was received (crossing a
1387 * filemark, or end of the media, for example).
1388 */
1389 if (!test_bit(PC_ABORT, &pc->flags)) {
Borislav Petkov90699ce2008-02-02 19:56:50 +01001390 if (!(pc->c[0] == TEST_UNIT_READY &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 tape->sense_key == 2 && tape->asc == 4 &&
1392 (tape->ascq == 1 || tape->ascq == 8))) {
1393 printk(KERN_ERR "ide-tape: %s: I/O error, "
1394 "pc = %2x, key = %2x, "
1395 "asc = %2x, ascq = %2x\n",
1396 tape->name, pc->c[0],
1397 tape->sense_key, tape->asc,
1398 tape->ascq);
1399 }
1400 /* Giving up */
1401 pc->error = IDETAPE_ERROR_GENERAL;
1402 }
1403 tape->failed_pc = NULL;
1404 return pc->callback(drive);
1405 }
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001406 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407
1408 pc->retries++;
1409 /* We haven't transferred any data yet */
1410 pc->actually_transferred = 0;
1411 pc->current_position = pc->buffer;
1412 /* Request to transfer the entire buffer at once */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001413 bcount = pc->request_transfer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414
1415 if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) {
1416 printk(KERN_WARNING "ide-tape: DMA disabled, "
1417 "reverting to PIO\n");
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +01001418 ide_dma_off(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 }
1420 if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
1421 dma_ok = !hwif->dma_setup(drive);
1422
Bartlomiej Zolnierkiewicz2fc57382008-01-25 22:17:13 +01001423 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
1424 IDE_TFLAG_OUT_DEVICE, bcount, dma_ok);
1425
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 if (dma_ok) /* Will begin DMA later */
1427 set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
1428 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) {
Bartlomiej Zolnierkiewiczc1c9dbc2008-02-02 19:56:44 +01001429 ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc,
1430 IDETAPE_WAIT_CMD, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 return ide_started;
1432 } else {
1433 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
1434 return idetape_transfer_pc(drive);
1435 }
1436}
1437
1438/*
1439 * General packet command callback function.
1440 */
1441static ide_startstop_t idetape_pc_callback (ide_drive_t *drive)
1442{
1443 idetape_tape_t *tape = drive->driver_data;
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001444
1445 debug_log(DBG_PROCS, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446
1447 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
1448 return ide_stopped;
1449}
1450
1451/*
1452 * A mode sense command is used to "sense" tape parameters.
1453 */
1454static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
1455{
1456 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001457 pc->c[0] = MODE_SENSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
1459 pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */
1460 pc->c[2] = page_code;
1461 /*
1462 * Changed pc->c[3] to 0 (255 will at best return unused info).
1463 *
1464 * For SCSI this byte is defined as subpage instead of high byte
1465 * of length and some IDE drives seem to interpret it this way
1466 * and return an error when 255 is used.
1467 */
1468 pc->c[3] = 0;
1469 pc->c[4] = 255; /* (We will just discard data in that case) */
1470 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
1471 pc->request_transfer = 12;
1472 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
1473 pc->request_transfer = 24;
1474 else
1475 pc->request_transfer = 50;
1476 pc->callback = &idetape_pc_callback;
1477}
1478
Borislav Petkov37016ba2008-02-06 02:57:52 +01001479static void idetape_calculate_speeds(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480{
1481 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482
1483 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
1484 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
1485 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time;
1486 tape->controlled_last_pipeline_head = tape->pipeline_head;
1487 tape->controlled_pipeline_head_time = jiffies;
1488 }
1489 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
1490 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time);
1491 else if (time_after(jiffies, tape->controlled_previous_head_time))
1492 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time);
1493
1494 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) {
1495 /* -1 for read mode error recovery */
1496 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) {
1497 tape->uncontrolled_pipeline_head_time = jiffies;
1498 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time);
1499 }
1500 } else {
1501 tape->uncontrolled_previous_head_time = jiffies;
1502 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
1503 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) {
1504 tape->uncontrolled_pipeline_head_time = jiffies;
1505 }
1506 }
1507 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
Borislav Petkov37016ba2008-02-06 02:57:52 +01001508
1509 if (tape->speed_control == 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510 if (tape->nr_pending_stages >= tape->max_stages / 2)
1511 tape->max_insert_speed = tape->pipeline_head_speed +
1512 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
1513 else
1514 tape->max_insert_speed = 500 +
1515 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
Borislav Petkov37016ba2008-02-06 02:57:52 +01001516
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
1518 tape->max_insert_speed = 5000;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 } else
1520 tape->max_insert_speed = tape->speed_control;
Borislav Petkov37016ba2008-02-06 02:57:52 +01001521
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522 tape->max_insert_speed = max(tape->max_insert_speed, 500);
1523}
1524
1525static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
1526{
1527 idetape_tape_t *tape = drive->driver_data;
1528 idetape_pc_t *pc = tape->pc;
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001529 u8 stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +01001531 stat = ide_read_status(drive);
1532
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001533 if (stat & SEEK_STAT) {
1534 if (stat & ERR_STAT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 /* Error detected */
Borislav Petkov90699ce2008-02-02 19:56:50 +01001536 if (pc->c[0] != TEST_UNIT_READY)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 printk(KERN_ERR "ide-tape: %s: I/O error, ",
1538 tape->name);
1539 /* Retry operation */
1540 return idetape_retry_pc(drive);
1541 }
1542 pc->error = 0;
1543 if (tape->failed_pc == pc)
1544 tape->failed_pc = NULL;
1545 } else {
1546 pc->error = IDETAPE_ERROR_GENERAL;
1547 tape->failed_pc = NULL;
1548 }
1549 return pc->callback(drive);
1550}
1551
1552static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
1553{
1554 idetape_tape_t *tape = drive->driver_data;
1555 struct request *rq = HWGROUP(drive)->rq;
1556 int blocks = tape->pc->actually_transferred / tape->tape_block_size;
1557
1558 tape->avg_size += blocks * tape->tape_block_size;
1559 tape->insert_size += blocks * tape->tape_block_size;
1560 if (tape->insert_size > 1024 * 1024)
1561 tape->measure_insert_time = 1;
1562 if (tape->measure_insert_time) {
1563 tape->measure_insert_time = 0;
1564 tape->insert_time = jiffies;
1565 tape->insert_size = 0;
1566 }
1567 if (time_after(jiffies, tape->insert_time))
1568 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
Marcelo Feitoza Parisi9bae1ff2006-03-28 01:56:46 -08001569 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024;
1571 tape->avg_size = 0;
1572 tape->avg_time = jiffies;
1573 }
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001574 debug_log(DBG_PROCS, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575
1576 tape->first_frame_position += blocks;
1577 rq->current_nr_sectors -= blocks;
1578
1579 if (!tape->pc->error)
1580 idetape_end_request(drive, 1, 0);
1581 else
1582 idetape_end_request(drive, tape->pc->error, 0);
1583 return ide_stopped;
1584}
1585
1586static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
1587{
1588 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001589 pc->c[0] = READ_6;
Borislav Petkov860ff5e2008-02-02 19:56:50 +01001590 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591 pc->c[1] = 1;
1592 pc->callback = &idetape_rw_callback;
1593 pc->bh = bh;
1594 atomic_set(&bh->b_count, 0);
1595 pc->buffer = NULL;
1596 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
1597 if (pc->request_transfer == tape->stage_size)
1598 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
1599}
1600
1601static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
1602{
1603 int size = 32768;
1604 struct idetape_bh *p = bh;
1605
1606 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001607 pc->c[0] = READ_BUFFER;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK;
1609 pc->c[7] = size >> 8;
1610 pc->c[8] = size & 0xff;
1611 pc->callback = &idetape_pc_callback;
1612 pc->bh = bh;
1613 atomic_set(&bh->b_count, 0);
1614 pc->buffer = NULL;
1615 while (p) {
1616 atomic_set(&p->b_count, 0);
1617 p = p->b_reqnext;
1618 }
1619 pc->request_transfer = pc->buffer_size = size;
1620}
1621
1622static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
1623{
1624 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01001625 pc->c[0] = WRITE_6;
Borislav Petkov860ff5e2008-02-02 19:56:50 +01001626 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627 pc->c[1] = 1;
1628 pc->callback = &idetape_rw_callback;
1629 set_bit(PC_WRITING, &pc->flags);
1630 pc->bh = bh;
1631 pc->b_data = bh->b_data;
1632 pc->b_count = atomic_read(&bh->b_count);
1633 pc->buffer = NULL;
1634 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
1635 if (pc->request_transfer == tape->stage_size)
1636 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
1637}
1638
1639/*
1640 * idetape_do_request is our request handling function.
1641 */
1642static ide_startstop_t idetape_do_request(ide_drive_t *drive,
1643 struct request *rq, sector_t block)
1644{
1645 idetape_tape_t *tape = drive->driver_data;
1646 idetape_pc_t *pc = NULL;
1647 struct request *postponed_rq = tape->postponed_rq;
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001648 u8 stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001650 debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld,"
1651 " current_nr_sectors: %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653
Jens Axboe4aff5e22006-08-10 08:44:47 +02001654 if (!blk_special_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 /*
1656 * We do not support buffer cache originated requests.
1657 */
1658 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
Jens Axboe4aff5e22006-08-10 08:44:47 +02001659 "request queue (%d)\n", drive->name, rq->cmd_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 ide_end_request(drive, 0, 0);
1661 return ide_stopped;
1662 }
1663
1664 /*
1665 * Retry a failed packet command
1666 */
1667 if (tape->failed_pc != NULL &&
Borislav Petkov90699ce2008-02-02 19:56:50 +01001668 tape->pc->c[0] == REQUEST_SENSE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 return idetape_issue_packet_command(drive, tape->failed_pc);
1670 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 if (postponed_rq != NULL)
1672 if (rq != postponed_rq) {
1673 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
1674 "Two DSC requests were queued\n");
1675 idetape_end_request(drive, 0, 0);
1676 return ide_stopped;
1677 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678
1679 tape->postponed_rq = NULL;
1680
1681 /*
1682 * If the tape is still busy, postpone our request and service
1683 * the other device meanwhile.
1684 */
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +01001685 stat = ide_read_status(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686
1687 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
1688 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1689
1690 if (drive->post_reset == 1) {
1691 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1692 drive->post_reset = 0;
1693 }
1694
1695 if (tape->tape_still_time > 100 && tape->tape_still_time < 200)
1696 tape->measure_insert_time = 1;
1697 if (time_after(jiffies, tape->insert_time))
1698 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
Borislav Petkov37016ba2008-02-06 02:57:52 +01001699 idetape_calculate_speeds(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001701 (stat & SEEK_STAT) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702 if (postponed_rq == NULL) {
1703 tape->dsc_polling_start = jiffies;
1704 tape->dsc_polling_frequency = tape->best_dsc_rw_frequency;
1705 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
1706 } else if (time_after(jiffies, tape->dsc_timeout)) {
1707 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
1708 tape->name);
1709 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1710 idetape_media_access_finished(drive);
1711 return ide_stopped;
1712 } else {
1713 return ide_do_reset(drive);
1714 }
Marcelo Feitoza Parisi9bae1ff2006-03-28 01:56:46 -08001715 } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716 tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW;
1717 idetape_postpone_request(drive);
1718 return ide_stopped;
1719 }
1720 if (rq->cmd[0] & REQ_IDETAPE_READ) {
1721 tape->buffer_head++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722 tape->postpone_cnt = 0;
1723 pc = idetape_next_pc_storage(drive);
1724 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
1725 goto out;
1726 }
1727 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
1728 tape->buffer_head++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729 tape->postpone_cnt = 0;
1730 pc = idetape_next_pc_storage(drive);
1731 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
1732 goto out;
1733 }
1734 if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) {
1735 tape->postpone_cnt = 0;
1736 pc = idetape_next_pc_storage(drive);
1737 idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
1738 goto out;
1739 }
1740 if (rq->cmd[0] & REQ_IDETAPE_PC1) {
1741 pc = (idetape_pc_t *) rq->buffer;
1742 rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
1743 rq->cmd[0] |= REQ_IDETAPE_PC2;
1744 goto out;
1745 }
1746 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1747 idetape_media_access_finished(drive);
1748 return ide_stopped;
1749 }
1750 BUG();
1751out:
1752 return idetape_issue_packet_command(drive, pc);
1753}
1754
1755/*
1756 * Pipeline related functions
1757 */
1758static inline int idetape_pipeline_active (idetape_tape_t *tape)
1759{
1760 int rc1, rc2;
1761
1762 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
1763 rc2 = (tape->active_data_request != NULL);
1764 return rc1;
1765}
1766
1767/*
1768 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
1769 * stage, along with all the necessary small buffers which together make
1770 * a buffer of size tape->stage_size (or a bit more). We attempt to
1771 * combine sequential pages as much as possible.
1772 *
1773 * Returns a pointer to the new allocated stage, or NULL if we
1774 * can't (or don't want to) allocate a stage.
1775 *
1776 * Pipeline stages are optional and are used to increase performance.
1777 * If we can't allocate them, we'll manage without them.
1778 */
1779static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear)
1780{
1781 idetape_stage_t *stage;
1782 struct idetape_bh *prev_bh, *bh;
1783 int pages = tape->pages_per_stage;
1784 char *b_data = NULL;
1785
Robert P. J. Day5cbded52006-12-13 00:35:56 -08001786 if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787 return NULL;
1788 stage->next = NULL;
1789
Robert P. J. Day5cbded52006-12-13 00:35:56 -08001790 bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791 if (bh == NULL)
1792 goto abort;
1793 bh->b_reqnext = NULL;
1794 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
1795 goto abort;
1796 if (clear)
1797 memset(bh->b_data, 0, PAGE_SIZE);
1798 bh->b_size = PAGE_SIZE;
1799 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1800
1801 while (--pages) {
1802 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
1803 goto abort;
1804 if (clear)
1805 memset(b_data, 0, PAGE_SIZE);
1806 if (bh->b_data == b_data + PAGE_SIZE) {
1807 bh->b_size += PAGE_SIZE;
1808 bh->b_data -= PAGE_SIZE;
1809 if (full)
1810 atomic_add(PAGE_SIZE, &bh->b_count);
1811 continue;
1812 }
1813 if (b_data == bh->b_data + bh->b_size) {
1814 bh->b_size += PAGE_SIZE;
1815 if (full)
1816 atomic_add(PAGE_SIZE, &bh->b_count);
1817 continue;
1818 }
1819 prev_bh = bh;
Robert P. J. Day5cbded52006-12-13 00:35:56 -08001820 if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821 free_page((unsigned long) b_data);
1822 goto abort;
1823 }
1824 bh->b_reqnext = NULL;
1825 bh->b_data = b_data;
1826 bh->b_size = PAGE_SIZE;
1827 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1828 prev_bh->b_reqnext = bh;
1829 }
1830 bh->b_size -= tape->excess_bh_size;
1831 if (full)
1832 atomic_sub(tape->excess_bh_size, &bh->b_count);
1833 return stage;
1834abort:
1835 __idetape_kfree_stage(stage);
1836 return NULL;
1837}
1838
1839static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
1840{
1841 idetape_stage_t *cache_stage = tape->cache_stage;
1842
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001843 debug_log(DBG_PROCS, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844
1845 if (tape->nr_stages >= tape->max_stages)
1846 return NULL;
1847 if (cache_stage != NULL) {
1848 tape->cache_stage = NULL;
1849 return cache_stage;
1850 }
1851 return __idetape_kmalloc_stage(tape, 0, 0);
1852}
1853
Daniel Walkerdcd96372006-06-25 05:47:37 -07001854static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855{
1856 struct idetape_bh *bh = tape->bh;
1857 int count;
Daniel Walkerdcd96372006-06-25 05:47:37 -07001858 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859
1860 while (n) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861 if (bh == NULL) {
1862 printk(KERN_ERR "ide-tape: bh == NULL in "
1863 "idetape_copy_stage_from_user\n");
Daniel Walkerdcd96372006-06-25 05:47:37 -07001864 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
Daniel Walkerdcd96372006-06-25 05:47:37 -07001867 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count))
1868 ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 n -= count;
1870 atomic_add(count, &bh->b_count);
1871 buf += count;
1872 if (atomic_read(&bh->b_count) == bh->b_size) {
1873 bh = bh->b_reqnext;
1874 if (bh)
1875 atomic_set(&bh->b_count, 0);
1876 }
1877 }
1878 tape->bh = bh;
Daniel Walkerdcd96372006-06-25 05:47:37 -07001879 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880}
1881
Daniel Walkerdcd96372006-06-25 05:47:37 -07001882static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883{
1884 struct idetape_bh *bh = tape->bh;
1885 int count;
Daniel Walkerdcd96372006-06-25 05:47:37 -07001886 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887
1888 while (n) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889 if (bh == NULL) {
1890 printk(KERN_ERR "ide-tape: bh == NULL in "
1891 "idetape_copy_stage_to_user\n");
Daniel Walkerdcd96372006-06-25 05:47:37 -07001892 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 count = min(tape->b_count, n);
Daniel Walkerdcd96372006-06-25 05:47:37 -07001895 if (copy_to_user(buf, tape->b_data, count))
1896 ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897 n -= count;
1898 tape->b_data += count;
1899 tape->b_count -= count;
1900 buf += count;
1901 if (!tape->b_count) {
1902 tape->bh = bh = bh->b_reqnext;
1903 if (bh) {
1904 tape->b_data = bh->b_data;
1905 tape->b_count = atomic_read(&bh->b_count);
1906 }
1907 }
1908 }
Daniel Walkerdcd96372006-06-25 05:47:37 -07001909 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910}
1911
1912static void idetape_init_merge_stage (idetape_tape_t *tape)
1913{
1914 struct idetape_bh *bh = tape->merge_stage->bh;
1915
1916 tape->bh = bh;
1917 if (tape->chrdev_direction == idetape_direction_write)
1918 atomic_set(&bh->b_count, 0);
1919 else {
1920 tape->b_data = bh->b_data;
1921 tape->b_count = atomic_read(&bh->b_count);
1922 }
1923}
1924
1925static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
1926{
1927 struct idetape_bh *tmp;
1928
1929 tmp = stage->bh;
1930 stage->bh = tape->merge_stage->bh;
1931 tape->merge_stage->bh = tmp;
1932 idetape_init_merge_stage(tape);
1933}
1934
1935/*
1936 * idetape_add_stage_tail adds a new stage at the end of the pipeline.
1937 */
1938static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
1939{
1940 idetape_tape_t *tape = drive->driver_data;
1941 unsigned long flags;
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001942
1943 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1944
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945 spin_lock_irqsave(&tape->spinlock, flags);
1946 stage->next = NULL;
1947 if (tape->last_stage != NULL)
1948 tape->last_stage->next=stage;
1949 else
1950 tape->first_stage = tape->next_stage=stage;
1951 tape->last_stage = stage;
1952 if (tape->next_stage == NULL)
1953 tape->next_stage = tape->last_stage;
1954 tape->nr_stages++;
1955 tape->nr_pending_stages++;
1956 spin_unlock_irqrestore(&tape->spinlock, flags);
1957}
1958
1959/*
1960 * idetape_wait_for_request installs a completion in a pending request
1961 * and sleeps until it is serviced.
1962 *
1963 * The caller should ensure that the request will not be serviced
1964 * before we install the completion (usually by disabling interrupts).
1965 */
1966static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
1967{
Peter Zijlstra6e9a4732006-09-30 23:28:10 -07001968 DECLARE_COMPLETION_ONSTACK(wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969 idetape_tape_t *tape = drive->driver_data;
1970
Jens Axboe4aff5e22006-08-10 08:44:47 +02001971 if (rq == NULL || !blk_special_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
1973 return;
1974 }
Jens Axboec00895a2006-09-30 20:29:12 +02001975 rq->end_io_data = &wait;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 rq->end_io = blk_end_sync_rq;
1977 spin_unlock_irq(&tape->spinlock);
1978 wait_for_completion(&wait);
1979 /* The stage and its struct request have been deallocated */
1980 spin_lock_irq(&tape->spinlock);
1981}
1982
Borislav Petkova2f5b7f2008-02-06 02:57:51 +01001983static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984{
1985 idetape_tape_t *tape = drive->driver_data;
Borislav Petkova2f5b7f2008-02-06 02:57:51 +01001986 u8 *readpos = tape->pc->buffer;
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001987
1988 debug_log(DBG_PROCS, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989
1990 if (!tape->pc->error) {
Borislav Petkova2f5b7f2008-02-06 02:57:51 +01001991 debug_log(DBG_SENSE, "BOP - %s\n",
1992 (readpos[0] & 0x80) ? "Yes" : "No");
1993 debug_log(DBG_SENSE, "EOP - %s\n",
1994 (readpos[0] & 0x40) ? "Yes" : "No");
Borislav Petkov8004a8c2008-02-06 02:57:51 +01001995
Borislav Petkova2f5b7f2008-02-06 02:57:51 +01001996 if (readpos[0] & 0x4) {
1997 printk(KERN_INFO "ide-tape: Block location is unknown"
1998 "to the tape\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999 clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
2000 idetape_end_request(drive, 0, 0);
2001 } else {
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002002 debug_log(DBG_SENSE, "Block Location - %u\n",
Borislav Petkova2f5b7f2008-02-06 02:57:51 +01002003 be32_to_cpu(*(u32 *)&readpos[4]));
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002004
Borislav Petkova2f5b7f2008-02-06 02:57:51 +01002005 tape->partition = readpos[1];
2006 tape->first_frame_position =
2007 be32_to_cpu(*(u32 *)&readpos[4]);
2008 tape->last_frame_position =
2009 be32_to_cpu(*(u32 *)&readpos[8]);
2010 tape->blocks_in_buffer = readpos[15];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011 set_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
2012 idetape_end_request(drive, 1, 0);
2013 }
2014 } else {
2015 idetape_end_request(drive, 0, 0);
2016 }
2017 return ide_stopped;
2018}
2019
2020/*
2021 * idetape_create_write_filemark_cmd will:
2022 *
2023 * 1. Write a filemark if write_filemark=1.
2024 * 2. Flush the device buffers without writing a filemark
2025 * if write_filemark=0.
2026 *
2027 */
2028static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark)
2029{
2030 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01002031 pc->c[0] = WRITE_FILEMARKS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032 pc->c[4] = write_filemark;
2033 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2034 pc->callback = &idetape_pc_callback;
2035}
2036
2037static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc)
2038{
2039 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01002040 pc->c[0] = TEST_UNIT_READY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041 pc->callback = &idetape_pc_callback;
2042}
2043
2044/*
2045 * idetape_queue_pc_tail is based on the following functions:
2046 *
2047 * ide_do_drive_cmd from ide.c
2048 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
2049 *
2050 * We add a special packet command request to the tail of the request
2051 * queue, and wait for it to be serviced.
2052 *
2053 * This is not to be called from within the request handling part
2054 * of the driver ! We allocate here data in the stack, and it is valid
2055 * until the request is finished. This is not the case for the bottom
2056 * part of the driver, where we are always leaving the functions to wait
2057 * for an interrupt or a timer event.
2058 *
2059 * From the bottom part of the driver, we should allocate safe memory
2060 * using idetape_next_pc_storage and idetape_next_rq_storage, and add
2061 * the request to the request list without waiting for it to be serviced !
2062 * In that case, we usually use idetape_queue_pc_head.
2063 */
2064static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc)
2065{
2066 struct ide_tape_obj *tape = drive->driver_data;
2067 struct request rq;
2068
2069 idetape_init_rq(&rq, REQ_IDETAPE_PC1);
2070 rq.buffer = (char *) pc;
2071 rq.rq_disk = tape->disk;
2072 return ide_do_drive_cmd(drive, &rq, ide_wait);
2073}
2074
2075static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd)
2076{
2077 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01002078 pc->c[0] = START_STOP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002079 pc->c[4] = cmd;
2080 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2081 pc->callback = &idetape_pc_callback;
2082}
2083
2084static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
2085{
2086 idetape_tape_t *tape = drive->driver_data;
2087 idetape_pc_t pc;
2088 int load_attempted = 0;
2089
2090 /*
2091 * Wait for the tape to become ready
2092 */
2093 set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
2094 timeout += jiffies;
2095 while (time_before(jiffies, timeout)) {
2096 idetape_create_test_unit_ready_cmd(&pc);
2097 if (!__idetape_queue_pc_tail(drive, &pc))
2098 return 0;
2099 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
2100 || (tape->asc == 0x3A)) { /* no media */
2101 if (load_attempted)
2102 return -ENOMEDIUM;
2103 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
2104 __idetape_queue_pc_tail(drive, &pc);
2105 load_attempted = 1;
2106 /* not about to be ready */
2107 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
2108 (tape->ascq == 1 || tape->ascq == 8)))
2109 return -EIO;
Nishanth Aravamudan80ce45f2005-09-10 00:27:08 -07002110 msleep(100);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002111 }
2112 return -EIO;
2113}
2114
2115static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
2116{
2117 return __idetape_queue_pc_tail(drive, pc);
2118}
2119
2120static int idetape_flush_tape_buffers (ide_drive_t *drive)
2121{
2122 idetape_pc_t pc;
2123 int rc;
2124
2125 idetape_create_write_filemark_cmd(drive, &pc, 0);
2126 if ((rc = idetape_queue_pc_tail(drive, &pc)))
2127 return rc;
2128 idetape_wait_ready(drive, 60 * 5 * HZ);
2129 return 0;
2130}
2131
2132static void idetape_create_read_position_cmd (idetape_pc_t *pc)
2133{
2134 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01002135 pc->c[0] = READ_POSITION;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136 pc->request_transfer = 20;
2137 pc->callback = &idetape_read_position_callback;
2138}
2139
2140static int idetape_read_position (ide_drive_t *drive)
2141{
2142 idetape_tape_t *tape = drive->driver_data;
2143 idetape_pc_t pc;
2144 int position;
2145
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002146 debug_log(DBG_PROCS, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147
2148 idetape_create_read_position_cmd(&pc);
2149 if (idetape_queue_pc_tail(drive, &pc))
2150 return -1;
2151 position = tape->first_frame_position;
2152 return position;
2153}
2154
2155static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip)
2156{
2157 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01002158 pc->c[0] = POSITION_TO_ELEMENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159 pc->c[1] = 2;
Borislav Petkov860ff5e2008-02-02 19:56:50 +01002160 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161 pc->c[8] = partition;
2162 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2163 pc->callback = &idetape_pc_callback;
2164}
2165
2166static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent)
2167{
2168 idetape_tape_t *tape = drive->driver_data;
2169
Borislav Petkovb6422012008-02-02 19:56:49 +01002170 /* device supports locking according to capabilities page */
2171 if (!(tape->caps[6] & 0x01))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002172 return 0;
2173
2174 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01002175 pc->c[0] = ALLOW_MEDIUM_REMOVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002176 pc->c[4] = prevent;
2177 pc->callback = &idetape_pc_callback;
2178 return 1;
2179}
2180
2181static int __idetape_discard_read_pipeline (ide_drive_t *drive)
2182{
2183 idetape_tape_t *tape = drive->driver_data;
2184 unsigned long flags;
2185 int cnt;
2186
2187 if (tape->chrdev_direction != idetape_direction_read)
2188 return 0;
2189
2190 /* Remove merge stage. */
2191 cnt = tape->merge_stage_size / tape->tape_block_size;
2192 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
2193 ++cnt; /* Filemarks count as 1 sector */
2194 tape->merge_stage_size = 0;
2195 if (tape->merge_stage != NULL) {
2196 __idetape_kfree_stage(tape->merge_stage);
2197 tape->merge_stage = NULL;
2198 }
2199
2200 /* Clear pipeline flags. */
2201 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
2202 tape->chrdev_direction = idetape_direction_none;
2203
2204 /* Remove pipeline stages. */
2205 if (tape->first_stage == NULL)
2206 return 0;
2207
2208 spin_lock_irqsave(&tape->spinlock, flags);
2209 tape->next_stage = NULL;
2210 if (idetape_pipeline_active(tape))
2211 idetape_wait_for_request(drive, tape->active_data_request);
2212 spin_unlock_irqrestore(&tape->spinlock, flags);
2213
2214 while (tape->first_stage != NULL) {
2215 struct request *rq_ptr = &tape->first_stage->rq;
2216
2217 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
2218 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
2219 ++cnt;
2220 idetape_remove_stage_head(drive);
2221 }
2222 tape->nr_pending_stages = 0;
2223 tape->max_stages = tape->min_pipeline;
2224 return cnt;
2225}
2226
2227/*
2228 * idetape_position_tape positions the tape to the requested block
2229 * using the LOCATE packet command. A READ POSITION command is then
2230 * issued to check where we are positioned.
2231 *
2232 * Like all higher level operations, we queue the commands at the tail
2233 * of the request queue and wait for their completion.
2234 *
2235 */
2236static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip)
2237{
2238 idetape_tape_t *tape = drive->driver_data;
2239 int retval;
2240 idetape_pc_t pc;
2241
2242 if (tape->chrdev_direction == idetape_direction_read)
2243 __idetape_discard_read_pipeline(drive);
2244 idetape_wait_ready(drive, 60 * 5 * HZ);
2245 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
2246 retval = idetape_queue_pc_tail(drive, &pc);
2247 if (retval)
2248 return (retval);
2249
2250 idetape_create_read_position_cmd(&pc);
2251 return (idetape_queue_pc_tail(drive, &pc));
2252}
2253
2254static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position)
2255{
2256 idetape_tape_t *tape = drive->driver_data;
2257 int cnt;
2258 int seek, position;
2259
2260 cnt = __idetape_discard_read_pipeline(drive);
2261 if (restore_position) {
2262 position = idetape_read_position(drive);
2263 seek = position > cnt ? position - cnt : 0;
2264 if (idetape_position_tape(drive, seek, 0, 0)) {
2265 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name);
2266 return;
2267 }
2268 }
2269}
2270
2271/*
2272 * idetape_queue_rw_tail generates a read/write request for the block
2273 * device interface and wait for it to be serviced.
2274 */
2275static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh)
2276{
2277 idetape_tape_t *tape = drive->driver_data;
2278 struct request rq;
2279
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002280 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
2281
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282 if (idetape_pipeline_active(tape)) {
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002283 printk(KERN_ERR "ide-tape: bug: the pipeline is active in %s\n",
2284 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002285 return (0);
2286 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002287
2288 idetape_init_rq(&rq, cmd);
2289 rq.rq_disk = tape->disk;
2290 rq.special = (void *)bh;
2291 rq.sector = tape->first_frame_position;
2292 rq.nr_sectors = rq.current_nr_sectors = blocks;
2293 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
2294
2295 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
2296 return 0;
2297
2298 if (tape->merge_stage)
2299 idetape_init_merge_stage(tape);
2300 if (rq.errors == IDETAPE_ERROR_GENERAL)
2301 return -EIO;
2302 return (tape->tape_block_size * (blocks-rq.current_nr_sectors));
2303}
2304
2305/*
2306 * idetape_insert_pipeline_into_queue is used to start servicing the
2307 * pipeline stages, starting from tape->next_stage.
2308 */
2309static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
2310{
2311 idetape_tape_t *tape = drive->driver_data;
2312
2313 if (tape->next_stage == NULL)
2314 return;
2315 if (!idetape_pipeline_active(tape)) {
2316 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
Borislav Petkov419d4742008-02-02 19:56:51 +01002317 idetape_activate_next_stage(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
2319 }
2320}
2321
2322static void idetape_create_inquiry_cmd (idetape_pc_t *pc)
2323{
2324 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01002325 pc->c[0] = INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002326 pc->c[4] = pc->request_transfer = 254;
2327 pc->callback = &idetape_pc_callback;
2328}
2329
2330static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
2331{
2332 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01002333 pc->c[0] = REZERO_UNIT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002334 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2335 pc->callback = &idetape_pc_callback;
2336}
2337
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338static void idetape_create_erase_cmd (idetape_pc_t *pc)
2339{
2340 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01002341 pc->c[0] = ERASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342 pc->c[1] = 1;
2343 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2344 pc->callback = &idetape_pc_callback;
2345}
2346
2347static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd)
2348{
2349 idetape_init_pc(pc);
Borislav Petkov90699ce2008-02-02 19:56:50 +01002350 pc->c[0] = SPACE;
Borislav Petkov860ff5e2008-02-02 19:56:50 +01002351 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352 pc->c[1] = cmd;
2353 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2354 pc->callback = &idetape_pc_callback;
2355}
2356
2357static void idetape_wait_first_stage (ide_drive_t *drive)
2358{
2359 idetape_tape_t *tape = drive->driver_data;
2360 unsigned long flags;
2361
2362 if (tape->first_stage == NULL)
2363 return;
2364 spin_lock_irqsave(&tape->spinlock, flags);
2365 if (tape->active_stage == tape->first_stage)
2366 idetape_wait_for_request(drive, tape->active_data_request);
2367 spin_unlock_irqrestore(&tape->spinlock, flags);
2368}
2369
2370/*
2371 * idetape_add_chrdev_write_request tries to add a character device
2372 * originated write request to our pipeline. In case we don't succeed,
2373 * we revert to non-pipelined operation mode for this request.
2374 *
2375 * 1. Try to allocate a new pipeline stage.
2376 * 2. If we can't, wait for more and more requests to be serviced
2377 * and try again each time.
2378 * 3. If we still can't allocate a stage, fallback to
2379 * non-pipelined operation mode for this request.
2380 */
2381static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
2382{
2383 idetape_tape_t *tape = drive->driver_data;
2384 idetape_stage_t *new_stage;
2385 unsigned long flags;
2386 struct request *rq;
2387
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002388 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002389
2390 /*
2391 * Attempt to allocate a new stage.
2392 * Pay special attention to possible race conditions.
2393 */
2394 while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
2395 spin_lock_irqsave(&tape->spinlock, flags);
2396 if (idetape_pipeline_active(tape)) {
2397 idetape_wait_for_request(drive, tape->active_data_request);
2398 spin_unlock_irqrestore(&tape->spinlock, flags);
2399 } else {
2400 spin_unlock_irqrestore(&tape->spinlock, flags);
2401 idetape_insert_pipeline_into_queue(drive);
2402 if (idetape_pipeline_active(tape))
2403 continue;
2404 /*
2405 * Linux is short on memory. Fallback to
2406 * non-pipelined operation mode for this request.
2407 */
2408 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
2409 }
2410 }
2411 rq = &new_stage->rq;
2412 idetape_init_rq(rq, REQ_IDETAPE_WRITE);
2413 /* Doesn't actually matter - We always assume sequential access */
2414 rq->sector = tape->first_frame_position;
2415 rq->nr_sectors = rq->current_nr_sectors = blocks;
2416
2417 idetape_switch_buffers(tape, new_stage);
2418 idetape_add_stage_tail(drive, new_stage);
2419 tape->pipeline_head++;
Borislav Petkov37016ba2008-02-06 02:57:52 +01002420 idetape_calculate_speeds(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002421
2422 /*
2423 * Estimate whether the tape has stopped writing by checking
2424 * if our write pipeline is currently empty. If we are not
2425 * writing anymore, wait for the pipeline to be full enough
2426 * (90%) before starting to service requests, so that we will
2427 * be able to keep up with the higher speeds of the tape.
2428 */
2429 if (!idetape_pipeline_active(tape)) {
2430 if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
2431 tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) {
2432 tape->measure_insert_time = 1;
2433 tape->insert_time = jiffies;
2434 tape->insert_size = 0;
2435 tape->insert_speed = 0;
2436 idetape_insert_pipeline_into_queue(drive);
2437 }
2438 }
2439 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
2440 /* Return a deferred error */
2441 return -EIO;
2442 return blocks;
2443}
2444
2445/*
2446 * idetape_wait_for_pipeline will wait until all pending pipeline
2447 * requests are serviced. Typically called on device close.
2448 */
2449static void idetape_wait_for_pipeline (ide_drive_t *drive)
2450{
2451 idetape_tape_t *tape = drive->driver_data;
2452 unsigned long flags;
2453
2454 while (tape->next_stage || idetape_pipeline_active(tape)) {
2455 idetape_insert_pipeline_into_queue(drive);
2456 spin_lock_irqsave(&tape->spinlock, flags);
2457 if (idetape_pipeline_active(tape))
2458 idetape_wait_for_request(drive, tape->active_data_request);
2459 spin_unlock_irqrestore(&tape->spinlock, flags);
2460 }
2461}
2462
2463static void idetape_empty_write_pipeline (ide_drive_t *drive)
2464{
2465 idetape_tape_t *tape = drive->driver_data;
2466 int blocks, min;
2467 struct idetape_bh *bh;
Borislav Petkov55a5d292008-02-02 19:56:49 +01002468
Linus Torvalds1da177e2005-04-16 15:20:36 -07002469 if (tape->chrdev_direction != idetape_direction_write) {
2470 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
2471 return;
2472 }
2473 if (tape->merge_stage_size > tape->stage_size) {
2474 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
2475 tape->merge_stage_size = tape->stage_size;
2476 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002477 if (tape->merge_stage_size) {
2478 blocks = tape->merge_stage_size / tape->tape_block_size;
2479 if (tape->merge_stage_size % tape->tape_block_size) {
2480 unsigned int i;
2481
2482 blocks++;
2483 i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size;
2484 bh = tape->bh->b_reqnext;
2485 while (bh) {
2486 atomic_set(&bh->b_count, 0);
2487 bh = bh->b_reqnext;
2488 }
2489 bh = tape->bh;
2490 while (i) {
2491 if (bh == NULL) {
2492
2493 printk(KERN_INFO "ide-tape: bug, bh NULL\n");
2494 break;
2495 }
2496 min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count)));
2497 memset(bh->b_data + atomic_read(&bh->b_count), 0, min);
2498 atomic_add(min, &bh->b_count);
2499 i -= min;
2500 bh = bh->b_reqnext;
2501 }
2502 }
2503 (void) idetape_add_chrdev_write_request(drive, blocks);
2504 tape->merge_stage_size = 0;
2505 }
2506 idetape_wait_for_pipeline(drive);
2507 if (tape->merge_stage != NULL) {
2508 __idetape_kfree_stage(tape->merge_stage);
2509 tape->merge_stage = NULL;
2510 }
2511 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
2512 tape->chrdev_direction = idetape_direction_none;
2513
2514 /*
2515 * On the next backup, perform the feedback loop again.
2516 * (I don't want to keep sense information between backups,
2517 * as some systems are constantly on, and the system load
2518 * can be totally different on the next backup).
2519 */
2520 tape->max_stages = tape->min_pipeline;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521 if (tape->first_stage != NULL ||
2522 tape->next_stage != NULL ||
2523 tape->last_stage != NULL ||
2524 tape->nr_stages != 0) {
2525 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
2526 "first_stage %p, next_stage %p, "
2527 "last_stage %p, nr_stages %d\n",
2528 tape->first_stage, tape->next_stage,
2529 tape->last_stage, tape->nr_stages);
2530 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002531}
2532
2533static void idetape_restart_speed_control (ide_drive_t *drive)
2534{
2535 idetape_tape_t *tape = drive->driver_data;
2536
2537 tape->restart_speed_control_req = 0;
2538 tape->pipeline_head = 0;
2539 tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0;
2540 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0;
2541 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000;
2542 tape->uncontrolled_pipeline_head_speed = 0;
2543 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies;
2544 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies;
2545}
2546
2547static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
2548{
2549 idetape_tape_t *tape = drive->driver_data;
2550 idetape_stage_t *new_stage;
2551 struct request rq;
2552 int bytes_read;
Borislav Petkovb6422012008-02-02 19:56:49 +01002553 u16 blocks = *(u16 *)&tape->caps[12];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002554
2555 /* Initialize read operation */
2556 if (tape->chrdev_direction != idetape_direction_read) {
2557 if (tape->chrdev_direction == idetape_direction_write) {
2558 idetape_empty_write_pipeline(drive);
2559 idetape_flush_tape_buffers(drive);
2560 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002561 if (tape->merge_stage || tape->merge_stage_size) {
2562 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
2563 tape->merge_stage_size = 0;
2564 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002565 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
2566 return -ENOMEM;
2567 tape->chrdev_direction = idetape_direction_read;
2568
2569 /*
2570 * Issue a read 0 command to ensure that DSC handshake
2571 * is switched from completion mode to buffer available
2572 * mode.
2573 * No point in issuing this if DSC overlap isn't supported,
2574 * some drives (Seagate STT3401A) will return an error.
2575 */
2576 if (drive->dsc_overlap) {
2577 bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
2578 if (bytes_read < 0) {
2579 __idetape_kfree_stage(tape->merge_stage);
2580 tape->merge_stage = NULL;
2581 tape->chrdev_direction = idetape_direction_none;
2582 return bytes_read;
2583 }
2584 }
2585 }
2586 if (tape->restart_speed_control_req)
2587 idetape_restart_speed_control(drive);
2588 idetape_init_rq(&rq, REQ_IDETAPE_READ);
2589 rq.sector = tape->first_frame_position;
2590 rq.nr_sectors = rq.current_nr_sectors = blocks;
2591 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) &&
2592 tape->nr_stages < max_stages) {
2593 new_stage = idetape_kmalloc_stage(tape);
2594 while (new_stage != NULL) {
2595 new_stage->rq = rq;
2596 idetape_add_stage_tail(drive, new_stage);
2597 if (tape->nr_stages >= max_stages)
2598 break;
2599 new_stage = idetape_kmalloc_stage(tape);
2600 }
2601 }
2602 if (!idetape_pipeline_active(tape)) {
2603 if (tape->nr_pending_stages >= 3 * max_stages / 4) {
2604 tape->measure_insert_time = 1;
2605 tape->insert_time = jiffies;
2606 tape->insert_size = 0;
2607 tape->insert_speed = 0;
2608 idetape_insert_pipeline_into_queue(drive);
2609 }
2610 }
2611 return 0;
2612}
2613
2614/*
2615 * idetape_add_chrdev_read_request is called from idetape_chrdev_read
2616 * to service a character device read request and add read-ahead
2617 * requests to our pipeline.
2618 */
2619static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
2620{
2621 idetape_tape_t *tape = drive->driver_data;
2622 unsigned long flags;
2623 struct request *rq_ptr;
2624 int bytes_read;
2625
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002626 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002627
2628 /*
2629 * If we are at a filemark, return a read length of 0
2630 */
2631 if (test_bit(IDETAPE_FILEMARK, &tape->flags))
2632 return 0;
2633
2634 /*
2635 * Wait for the next block to be available at the head
2636 * of the pipeline
2637 */
2638 idetape_initiate_read(drive, tape->max_stages);
2639 if (tape->first_stage == NULL) {
2640 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
2641 return 0;
2642 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh);
2643 }
2644 idetape_wait_first_stage(drive);
2645 rq_ptr = &tape->first_stage->rq;
2646 bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors);
2647 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
2648
2649
2650 if (rq_ptr->errors == IDETAPE_ERROR_EOD)
2651 return 0;
2652 else {
2653 idetape_switch_buffers(tape, tape->first_stage);
2654 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
2655 set_bit(IDETAPE_FILEMARK, &tape->flags);
2656 spin_lock_irqsave(&tape->spinlock, flags);
2657 idetape_remove_stage_head(drive);
2658 spin_unlock_irqrestore(&tape->spinlock, flags);
2659 tape->pipeline_head++;
Borislav Petkov37016ba2008-02-06 02:57:52 +01002660 idetape_calculate_speeds(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002661 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662 if (bytes_read > blocks * tape->tape_block_size) {
2663 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
2664 bytes_read = blocks * tape->tape_block_size;
2665 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002666 return (bytes_read);
2667}
2668
2669static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
2670{
2671 idetape_tape_t *tape = drive->driver_data;
2672 struct idetape_bh *bh;
2673 int blocks;
2674
2675 while (bcount) {
2676 unsigned int count;
2677
2678 bh = tape->merge_stage->bh;
2679 count = min(tape->stage_size, bcount);
2680 bcount -= count;
2681 blocks = count / tape->tape_block_size;
2682 while (count) {
2683 atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size));
2684 memset(bh->b_data, 0, atomic_read(&bh->b_count));
2685 count -= atomic_read(&bh->b_count);
2686 bh = bh->b_reqnext;
2687 }
2688 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
2689 }
2690}
2691
2692static int idetape_pipeline_size (ide_drive_t *drive)
2693{
2694 idetape_tape_t *tape = drive->driver_data;
2695 idetape_stage_t *stage;
2696 struct request *rq;
2697 int size = 0;
2698
2699 idetape_wait_for_pipeline(drive);
2700 stage = tape->first_stage;
2701 while (stage != NULL) {
2702 rq = &stage->rq;
2703 size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors);
2704 if (rq->errors == IDETAPE_ERROR_FILEMARK)
2705 size += tape->tape_block_size;
2706 stage = stage->next;
2707 }
2708 size += tape->merge_stage_size;
2709 return size;
2710}
2711
2712/*
2713 * Rewinds the tape to the Beginning Of the current Partition (BOP).
2714 *
2715 * We currently support only one partition.
2716 */
2717static int idetape_rewind_tape (ide_drive_t *drive)
2718{
2719 int retval;
2720 idetape_pc_t pc;
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002721 idetape_tape_t *tape;
2722 tape = drive->driver_data;
2723
2724 debug_log(DBG_SENSE, "Enter %s\n", __func__);
2725
Linus Torvalds1da177e2005-04-16 15:20:36 -07002726 idetape_create_rewind_cmd(drive, &pc);
2727 retval = idetape_queue_pc_tail(drive, &pc);
2728 if (retval)
2729 return retval;
2730
2731 idetape_create_read_position_cmd(&pc);
2732 retval = idetape_queue_pc_tail(drive, &pc);
2733 if (retval)
2734 return retval;
2735 return 0;
2736}
2737
2738/*
2739 * Our special ide-tape ioctl's.
2740 *
2741 * Currently there aren't any ioctl's.
2742 * mtio.h compatible commands should be issued to the character device
2743 * interface.
2744 */
2745static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg)
2746{
2747 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002748 void __user *argp = (void __user *)arg;
2749
Borislav Petkovd59823f2008-02-02 19:56:51 +01002750 struct idetape_config {
2751 int dsc_rw_frequency;
2752 int dsc_media_access_frequency;
2753 int nr_stages;
2754 } config;
2755
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002756 debug_log(DBG_PROCS, "Enter %s\n", __func__);
2757
Linus Torvalds1da177e2005-04-16 15:20:36 -07002758 switch (cmd) {
2759 case 0x0340:
Borislav Petkovd59823f2008-02-02 19:56:51 +01002760 if (copy_from_user(&config, argp, sizeof(config)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002761 return -EFAULT;
2762 tape->best_dsc_rw_frequency = config.dsc_rw_frequency;
2763 tape->max_stages = config.nr_stages;
2764 break;
2765 case 0x0350:
2766 config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency;
2767 config.nr_stages = tape->max_stages;
Borislav Petkovd59823f2008-02-02 19:56:51 +01002768 if (copy_to_user(argp, &config, sizeof(config)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002769 return -EFAULT;
2770 break;
2771 default:
2772 return -EIO;
2773 }
2774 return 0;
2775}
2776
2777/*
2778 * idetape_space_over_filemarks is now a bit more complicated than just
2779 * passing the command to the tape since we may have crossed some
2780 * filemarks during our pipelined read-ahead mode.
2781 *
2782 * As a minor side effect, the pipeline enables us to support MTFSFM when
2783 * the filemark is in our internal pipeline even if the tape doesn't
2784 * support spacing over filemarks in the reverse direction.
2785 */
2786static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
2787{
2788 idetape_tape_t *tape = drive->driver_data;
2789 idetape_pc_t pc;
2790 unsigned long flags;
2791 int retval,count=0;
Borislav Petkovb6422012008-02-02 19:56:49 +01002792 int sprev = !!(tape->caps[4] & 0x20);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002793
2794 if (mt_count == 0)
2795 return 0;
2796 if (MTBSF == mt_op || MTBSFM == mt_op) {
Borislav Petkovb6422012008-02-02 19:56:49 +01002797 if (!sprev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002798 return -EIO;
2799 mt_count = - mt_count;
2800 }
2801
2802 if (tape->chrdev_direction == idetape_direction_read) {
2803 /*
2804 * We have a read-ahead buffer. Scan it for crossed
2805 * filemarks.
2806 */
2807 tape->merge_stage_size = 0;
2808 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
2809 ++count;
2810 while (tape->first_stage != NULL) {
2811 if (count == mt_count) {
2812 if (mt_op == MTFSFM)
2813 set_bit(IDETAPE_FILEMARK, &tape->flags);
2814 return 0;
2815 }
2816 spin_lock_irqsave(&tape->spinlock, flags);
2817 if (tape->first_stage == tape->active_stage) {
2818 /*
2819 * We have reached the active stage in the read pipeline.
2820 * There is no point in allowing the drive to continue
2821 * reading any farther, so we stop the pipeline.
2822 *
2823 * This section should be moved to a separate subroutine,
2824 * because a similar function is performed in
2825 * __idetape_discard_read_pipeline(), for example.
2826 */
2827 tape->next_stage = NULL;
2828 spin_unlock_irqrestore(&tape->spinlock, flags);
2829 idetape_wait_first_stage(drive);
2830 tape->next_stage = tape->first_stage->next;
2831 } else
2832 spin_unlock_irqrestore(&tape->spinlock, flags);
2833 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
2834 ++count;
2835 idetape_remove_stage_head(drive);
2836 }
2837 idetape_discard_read_pipeline(drive, 0);
2838 }
2839
2840 /*
2841 * The filemark was not found in our internal pipeline.
2842 * Now we can issue the space command.
2843 */
2844 switch (mt_op) {
2845 case MTFSF:
2846 case MTBSF:
2847 idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
2848 return (idetape_queue_pc_tail(drive, &pc));
2849 case MTFSFM:
2850 case MTBSFM:
Borislav Petkovb6422012008-02-02 19:56:49 +01002851 if (!sprev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002852 return (-EIO);
2853 retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count);
2854 if (retval) return (retval);
2855 count = (MTBSFM == mt_op ? 1 : -1);
2856 return (idetape_space_over_filemarks(drive, MTFSF, count));
2857 default:
2858 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
2859 return (-EIO);
2860 }
2861}
2862
2863
2864/*
2865 * Our character device read / write functions.
2866 *
2867 * The tape is optimized to maximize throughput when it is transferring
2868 * an integral number of the "continuous transfer limit", which is
2869 * a parameter of the specific tape (26 KB on my particular tape).
2870 * (32 kB for Onstream)
2871 *
2872 * As of version 1.3 of the driver, the character device provides an
2873 * abstract continuous view of the media - any mix of block sizes (even 1
2874 * byte) on the same backup/restore procedure is supported. The driver
2875 * will internally convert the requests to the recommended transfer unit,
2876 * so that an unmatch between the user's block size to the recommended
2877 * size will only result in a (slightly) increased driver overhead, but
2878 * will no longer hit performance.
2879 * This is not applicable to Onstream.
2880 */
2881static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
2882 size_t count, loff_t *ppos)
2883{
2884 struct ide_tape_obj *tape = ide_tape_f(file);
2885 ide_drive_t *drive = tape->drive;
2886 ssize_t bytes_read,temp, actually_read = 0, rc;
Daniel Walkerdcd96372006-06-25 05:47:37 -07002887 ssize_t ret = 0;
Borislav Petkovb6422012008-02-02 19:56:49 +01002888 u16 ctl = *(u16 *)&tape->caps[12];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002889
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002890 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002891
2892 if (tape->chrdev_direction != idetape_direction_read) {
2893 if (test_bit(IDETAPE_DETECT_BS, &tape->flags))
2894 if (count > tape->tape_block_size &&
2895 (count % tape->tape_block_size) == 0)
2896 tape->user_bs_factor = count / tape->tape_block_size;
2897 }
2898 if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0)
2899 return rc;
2900 if (count == 0)
2901 return (0);
2902 if (tape->merge_stage_size) {
2903 actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count);
Daniel Walkerdcd96372006-06-25 05:47:37 -07002904 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read))
2905 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002906 buf += actually_read;
2907 tape->merge_stage_size -= actually_read;
2908 count -= actually_read;
2909 }
2910 while (count >= tape->stage_size) {
Borislav Petkovb6422012008-02-02 19:56:49 +01002911 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002912 if (bytes_read <= 0)
2913 goto finish;
Daniel Walkerdcd96372006-06-25 05:47:37 -07002914 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read))
2915 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002916 buf += bytes_read;
2917 count -= bytes_read;
2918 actually_read += bytes_read;
2919 }
2920 if (count) {
Borislav Petkovb6422012008-02-02 19:56:49 +01002921 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002922 if (bytes_read <= 0)
2923 goto finish;
2924 temp = min((unsigned long)count, (unsigned long)bytes_read);
Daniel Walkerdcd96372006-06-25 05:47:37 -07002925 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp))
2926 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002927 actually_read += temp;
2928 tape->merge_stage_size = bytes_read-temp;
2929 }
2930finish:
2931 if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) {
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002932 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
2933
Linus Torvalds1da177e2005-04-16 15:20:36 -07002934 idetape_space_over_filemarks(drive, MTFSF, 1);
2935 return 0;
2936 }
Daniel Walkerdcd96372006-06-25 05:47:37 -07002937
2938 return (ret) ? ret : actually_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002939}
2940
2941static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
2942 size_t count, loff_t *ppos)
2943{
2944 struct ide_tape_obj *tape = ide_tape_f(file);
2945 ide_drive_t *drive = tape->drive;
Daniel Walkerdcd96372006-06-25 05:47:37 -07002946 ssize_t actually_written = 0;
2947 ssize_t ret = 0;
Borislav Petkovb6422012008-02-02 19:56:49 +01002948 u16 ctl = *(u16 *)&tape->caps[12];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002949
2950 /* The drive is write protected. */
2951 if (tape->write_prot)
2952 return -EACCES;
2953
Borislav Petkov8004a8c2008-02-06 02:57:51 +01002954 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955
2956 /* Initialize write operation */
2957 if (tape->chrdev_direction != idetape_direction_write) {
2958 if (tape->chrdev_direction == idetape_direction_read)
2959 idetape_discard_read_pipeline(drive, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002960 if (tape->merge_stage || tape->merge_stage_size) {
2961 printk(KERN_ERR "ide-tape: merge_stage_size "
2962 "should be 0 now\n");
2963 tape->merge_stage_size = 0;
2964 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002965 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
2966 return -ENOMEM;
2967 tape->chrdev_direction = idetape_direction_write;
2968 idetape_init_merge_stage(tape);
2969
2970 /*
2971 * Issue a write 0 command to ensure that DSC handshake
2972 * is switched from completion mode to buffer available
2973 * mode.
2974 * No point in issuing this if DSC overlap isn't supported,
2975 * some drives (Seagate STT3401A) will return an error.
2976 */
2977 if (drive->dsc_overlap) {
Daniel Walkerdcd96372006-06-25 05:47:37 -07002978 ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002979 if (retval < 0) {
2980 __idetape_kfree_stage(tape->merge_stage);
2981 tape->merge_stage = NULL;
2982 tape->chrdev_direction = idetape_direction_none;
2983 return retval;
2984 }
2985 }
2986 }
2987 if (count == 0)
2988 return (0);
2989 if (tape->restart_speed_control_req)
2990 idetape_restart_speed_control(drive);
2991 if (tape->merge_stage_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002992 if (tape->merge_stage_size >= tape->stage_size) {
2993 printk(KERN_ERR "ide-tape: bug: merge buffer too big\n");
2994 tape->merge_stage_size = 0;
2995 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002996 actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count);
Daniel Walkerdcd96372006-06-25 05:47:37 -07002997 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written))
2998 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002999 buf += actually_written;
3000 tape->merge_stage_size += actually_written;
3001 count -= actually_written;
3002
3003 if (tape->merge_stage_size == tape->stage_size) {
Daniel Walkerdcd96372006-06-25 05:47:37 -07003004 ssize_t retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003005 tape->merge_stage_size = 0;
Borislav Petkovb6422012008-02-02 19:56:49 +01003006 retval = idetape_add_chrdev_write_request(drive, ctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003007 if (retval <= 0)
3008 return (retval);
3009 }
3010 }
3011 while (count >= tape->stage_size) {
Daniel Walkerdcd96372006-06-25 05:47:37 -07003012 ssize_t retval;
3013 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size))
3014 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003015 buf += tape->stage_size;
3016 count -= tape->stage_size;
Borislav Petkovb6422012008-02-02 19:56:49 +01003017 retval = idetape_add_chrdev_write_request(drive, ctl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018 actually_written += tape->stage_size;
3019 if (retval <= 0)
3020 return (retval);
3021 }
3022 if (count) {
3023 actually_written += count;
Daniel Walkerdcd96372006-06-25 05:47:37 -07003024 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count))
3025 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026 tape->merge_stage_size += count;
3027 }
Daniel Walkerdcd96372006-06-25 05:47:37 -07003028 return (ret) ? ret : actually_written;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029}
3030
3031static int idetape_write_filemark (ide_drive_t *drive)
3032{
3033 idetape_pc_t pc;
3034
3035 /* Write a filemark */
3036 idetape_create_write_filemark_cmd(drive, &pc, 1);
3037 if (idetape_queue_pc_tail(drive, &pc)) {
3038 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
3039 return -EIO;
3040 }
3041 return 0;
3042}
3043
3044/*
Borislav Petkovd99c9da2008-02-02 19:56:51 +01003045 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
3046 * requested.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003047 *
Borislav Petkovd99c9da2008-02-02 19:56:51 +01003048 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
3049 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
3050 * usually not supported (it is supported in the rare case in which we crossed
3051 * the filemark during our read-ahead pipelined operation mode).
Linus Torvalds1da177e2005-04-16 15:20:36 -07003052 *
Borislav Petkovd99c9da2008-02-02 19:56:51 +01003053 * The following commands are currently not supported:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003054 *
Borislav Petkovd99c9da2008-02-02 19:56:51 +01003055 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
3056 * MT_ST_WRITE_THRESHOLD.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003057 */
Borislav Petkovd99c9da2008-02-02 19:56:51 +01003058static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003059{
3060 idetape_tape_t *tape = drive->driver_data;
3061 idetape_pc_t pc;
3062 int i,retval;
3063
Borislav Petkov8004a8c2008-02-06 02:57:51 +01003064 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
3065 mt_op, mt_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003066 /*
3067 * Commands which need our pipelined read-ahead stages.
3068 */
3069 switch (mt_op) {
3070 case MTFSF:
3071 case MTFSFM:
3072 case MTBSF:
3073 case MTBSFM:
3074 if (!mt_count)
3075 return (0);
3076 return (idetape_space_over_filemarks(drive,mt_op,mt_count));
3077 default:
3078 break;
3079 }
3080 switch (mt_op) {
3081 case MTWEOF:
3082 if (tape->write_prot)
3083 return -EACCES;
3084 idetape_discard_read_pipeline(drive, 1);
3085 for (i = 0; i < mt_count; i++) {
3086 retval = idetape_write_filemark(drive);
3087 if (retval)
3088 return retval;
3089 }
3090 return (0);
3091 case MTREW:
3092 idetape_discard_read_pipeline(drive, 0);
3093 if (idetape_rewind_tape(drive))
3094 return -EIO;
3095 return 0;
3096 case MTLOAD:
3097 idetape_discard_read_pipeline(drive, 0);
3098 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
3099 return (idetape_queue_pc_tail(drive, &pc));
3100 case MTUNLOAD:
3101 case MTOFFL:
3102 /*
3103 * If door is locked, attempt to unlock before
3104 * attempting to eject.
3105 */
3106 if (tape->door_locked) {
3107 if (idetape_create_prevent_cmd(drive, &pc, 0))
3108 if (!idetape_queue_pc_tail(drive, &pc))
3109 tape->door_locked = DOOR_UNLOCKED;
3110 }
3111 idetape_discard_read_pipeline(drive, 0);
3112 idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK);
3113 retval = idetape_queue_pc_tail(drive, &pc);
3114 if (!retval)
3115 clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
3116 return retval;
3117 case MTNOP:
3118 idetape_discard_read_pipeline(drive, 0);
3119 return (idetape_flush_tape_buffers(drive));
3120 case MTRETEN:
3121 idetape_discard_read_pipeline(drive, 0);
3122 idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
3123 return (idetape_queue_pc_tail(drive, &pc));
3124 case MTEOM:
3125 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
3126 return (idetape_queue_pc_tail(drive, &pc));
3127 case MTERASE:
3128 (void) idetape_rewind_tape(drive);
3129 idetape_create_erase_cmd(&pc);
3130 return (idetape_queue_pc_tail(drive, &pc));
3131 case MTSETBLK:
3132 if (mt_count) {
3133 if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size)
3134 return -EIO;
3135 tape->user_bs_factor = mt_count / tape->tape_block_size;
3136 clear_bit(IDETAPE_DETECT_BS, &tape->flags);
3137 } else
3138 set_bit(IDETAPE_DETECT_BS, &tape->flags);
3139 return 0;
3140 case MTSEEK:
3141 idetape_discard_read_pipeline(drive, 0);
3142 return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0);
3143 case MTSETPART:
3144 idetape_discard_read_pipeline(drive, 0);
3145 return (idetape_position_tape(drive, 0, mt_count, 0));
3146 case MTFSR:
3147 case MTBSR:
3148 case MTLOCK:
3149 if (!idetape_create_prevent_cmd(drive, &pc, 1))
3150 return 0;
3151 retval = idetape_queue_pc_tail(drive, &pc);
3152 if (retval) return retval;
3153 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
3154 return 0;
3155 case MTUNLOCK:
3156 if (!idetape_create_prevent_cmd(drive, &pc, 0))
3157 return 0;
3158 retval = idetape_queue_pc_tail(drive, &pc);
3159 if (retval) return retval;
3160 tape->door_locked = DOOR_UNLOCKED;
3161 return 0;
3162 default:
3163 printk(KERN_ERR "ide-tape: MTIO operation %d not "
3164 "supported\n", mt_op);
3165 return (-EIO);
3166 }
3167}
3168
3169/*
Borislav Petkovd99c9da2008-02-02 19:56:51 +01003170 * Our character device ioctls. General mtio.h magnetic io commands are
3171 * supported here, and not in the corresponding block interface. Our own
3172 * ide-tape ioctls are supported on both interfaces.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003173 */
Borislav Petkovd99c9da2008-02-02 19:56:51 +01003174static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
3175 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003176{
3177 struct ide_tape_obj *tape = ide_tape_f(file);
3178 ide_drive_t *drive = tape->drive;
3179 struct mtop mtop;
3180 struct mtget mtget;
3181 struct mtpos mtpos;
3182 int block_offset = 0, position = tape->first_frame_position;
3183 void __user *argp = (void __user *)arg;
3184
Borislav Petkov8004a8c2008-02-06 02:57:51 +01003185 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003186
3187 tape->restart_speed_control_req = 1;
3188 if (tape->chrdev_direction == idetape_direction_write) {
3189 idetape_empty_write_pipeline(drive);
3190 idetape_flush_tape_buffers(drive);
3191 }
3192 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
3193 block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor);
3194 if ((position = idetape_read_position(drive)) < 0)
3195 return -EIO;
3196 }
3197 switch (cmd) {
3198 case MTIOCTOP:
3199 if (copy_from_user(&mtop, argp, sizeof (struct mtop)))
3200 return -EFAULT;
3201 return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count));
3202 case MTIOCGET:
3203 memset(&mtget, 0, sizeof (struct mtget));
3204 mtget.mt_type = MT_ISSCSI2;
3205 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
3206 mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
3207 if (tape->drv_write_prot) {
3208 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
3209 }
3210 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
3211 return -EFAULT;
3212 return 0;
3213 case MTIOCPOS:
3214 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
3215 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
3216 return -EFAULT;
3217 return 0;
3218 default:
3219 if (tape->chrdev_direction == idetape_direction_read)
3220 idetape_discard_read_pipeline(drive, 1);
3221 return idetape_blkdev_ioctl(drive, cmd, arg);
3222 }
3223}
3224
Borislav Petkov3cffb9c2008-02-02 19:56:50 +01003225/*
3226 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
3227 * block size with the reported value.
3228 */
3229static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
3230{
3231 idetape_tape_t *tape = drive->driver_data;
3232 idetape_pc_t pc;
3233
3234 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
3235 if (idetape_queue_pc_tail(drive, &pc)) {
3236 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
3237 if (tape->tape_block_size == 0) {
3238 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
3239 "block size, assuming 32k\n");
3240 tape->tape_block_size = 32768;
3241 }
3242 return;
3243 }
3244 tape->tape_block_size = (pc.buffer[4 + 5] << 16) +
3245 (pc.buffer[4 + 6] << 8) +
3246 pc.buffer[4 + 7];
3247 tape->drv_write_prot = (pc.buffer[2] & 0x80) >> 7;
3248}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003249
3250/*
3251 * Our character device open function.
3252 */
3253static int idetape_chrdev_open (struct inode *inode, struct file *filp)
3254{
3255 unsigned int minor = iminor(inode), i = minor & ~0xc0;
3256 ide_drive_t *drive;
3257 idetape_tape_t *tape;
3258 idetape_pc_t pc;
3259 int retval;
3260
Borislav Petkov8004a8c2008-02-06 02:57:51 +01003261 if (i >= MAX_HWIFS * MAX_DRIVES)
3262 return -ENXIO;
3263
3264 tape = ide_tape_chrdev_get(i);
3265 if (!tape)
3266 return -ENXIO;
3267
3268 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
3269
Linus Torvalds1da177e2005-04-16 15:20:36 -07003270 /*
3271 * We really want to do nonseekable_open(inode, filp); here, but some
3272 * versions of tar incorrectly call lseek on tapes and bail out if that
3273 * fails. So we disallow pread() and pwrite(), but permit lseeks.
3274 */
3275 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
3276
Linus Torvalds1da177e2005-04-16 15:20:36 -07003277 drive = tape->drive;
3278
3279 filp->private_data = tape;
3280
3281 if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) {
3282 retval = -EBUSY;
3283 goto out_put_tape;
3284 }
3285
3286 retval = idetape_wait_ready(drive, 60 * HZ);
3287 if (retval) {
3288 clear_bit(IDETAPE_BUSY, &tape->flags);
3289 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
3290 goto out_put_tape;
3291 }
3292
3293 idetape_read_position(drive);
3294 if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
3295 (void)idetape_rewind_tape(drive);
3296
3297 if (tape->chrdev_direction != idetape_direction_read)
3298 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
3299
3300 /* Read block size and write protect status from drive. */
Borislav Petkov3cffb9c2008-02-02 19:56:50 +01003301 ide_tape_get_bsize_from_bdesc(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003302
3303 /* Set write protect flag if device is opened as read-only. */
3304 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
3305 tape->write_prot = 1;
3306 else
3307 tape->write_prot = tape->drv_write_prot;
3308
3309 /* Make sure drive isn't write protected if user wants to write. */
3310 if (tape->write_prot) {
3311 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
3312 (filp->f_flags & O_ACCMODE) == O_RDWR) {
3313 clear_bit(IDETAPE_BUSY, &tape->flags);
3314 retval = -EROFS;
3315 goto out_put_tape;
3316 }
3317 }
3318
3319 /*
3320 * Lock the tape drive door so user can't eject.
3321 */
3322 if (tape->chrdev_direction == idetape_direction_none) {
3323 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
3324 if (!idetape_queue_pc_tail(drive, &pc)) {
3325 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
3326 tape->door_locked = DOOR_LOCKED;
3327 }
3328 }
3329 }
3330 idetape_restart_speed_control(drive);
3331 tape->restart_speed_control_req = 0;
3332 return 0;
3333
3334out_put_tape:
3335 ide_tape_put(tape);
3336 return retval;
3337}
3338
3339static void idetape_write_release (ide_drive_t *drive, unsigned int minor)
3340{
3341 idetape_tape_t *tape = drive->driver_data;
3342
3343 idetape_empty_write_pipeline(drive);
3344 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
3345 if (tape->merge_stage != NULL) {
3346 idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1));
3347 __idetape_kfree_stage(tape->merge_stage);
3348 tape->merge_stage = NULL;
3349 }
3350 idetape_write_filemark(drive);
3351 idetape_flush_tape_buffers(drive);
3352 idetape_flush_tape_buffers(drive);
3353}
3354
3355/*
3356 * Our character device release function.
3357 */
3358static int idetape_chrdev_release (struct inode *inode, struct file *filp)
3359{
3360 struct ide_tape_obj *tape = ide_tape_f(filp);
3361 ide_drive_t *drive = tape->drive;
3362 idetape_pc_t pc;
3363 unsigned int minor = iminor(inode);
3364
3365 lock_kernel();
3366 tape = drive->driver_data;
Borislav Petkov8004a8c2008-02-06 02:57:51 +01003367
3368 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003369
3370 if (tape->chrdev_direction == idetape_direction_write)
3371 idetape_write_release(drive, minor);
3372 if (tape->chrdev_direction == idetape_direction_read) {
3373 if (minor < 128)
3374 idetape_discard_read_pipeline(drive, 1);
3375 else
3376 idetape_wait_for_pipeline(drive);
3377 }
3378 if (tape->cache_stage != NULL) {
3379 __idetape_kfree_stage(tape->cache_stage);
3380 tape->cache_stage = NULL;
3381 }
3382 if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags))
3383 (void) idetape_rewind_tape(drive);
3384 if (tape->chrdev_direction == idetape_direction_none) {
3385 if (tape->door_locked == DOOR_LOCKED) {
3386 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
3387 if (!idetape_queue_pc_tail(drive, &pc))
3388 tape->door_locked = DOOR_UNLOCKED;
3389 }
3390 }
3391 }
3392 clear_bit(IDETAPE_BUSY, &tape->flags);
3393 ide_tape_put(tape);
3394 unlock_kernel();
3395 return 0;
3396}
3397
3398/*
3399 * idetape_identify_device is called to check the contents of the
3400 * ATAPI IDENTIFY command results. We return:
3401 *
3402 * 1 If the tape can be supported by us, based on the information
3403 * we have so far.
3404 *
3405 * 0 If this tape driver is not currently supported by us.
3406 */
3407static int idetape_identify_device (ide_drive_t *drive)
3408{
3409 struct idetape_id_gcw gcw;
3410 struct hd_driveid *id = drive->id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003411
3412 if (drive->id_read == 0)
3413 return 1;
3414
3415 *((unsigned short *) &gcw) = id->config;
3416
Linus Torvalds1da177e2005-04-16 15:20:36 -07003417 /* Check that we can support this device */
3418
Bartlomiej Zolnierkiewicz16422de32008-02-02 19:56:48 +01003419 if (gcw.protocol != 2)
3420 printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n",
3421 gcw.protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003422 else if (gcw.device_type != 1)
Bartlomiej Zolnierkiewicz16422de32008-02-02 19:56:48 +01003423 printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set "
3424 "to tape\n", gcw.device_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003425 else if (!gcw.removable)
3426 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
3427 else if (gcw.packet_size != 0) {
Bartlomiej Zolnierkiewicz16422de32008-02-02 19:56:48 +01003428 printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12 "
3429 "bytes long\n", gcw.packet_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003430 } else
3431 return 1;
3432 return 0;
3433}
3434
Borislav Petkov6d29c8f2008-02-02 19:56:49 +01003435static void idetape_get_inquiry_results(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003436{
3437 char *r;
3438 idetape_tape_t *tape = drive->driver_data;
3439 idetape_pc_t pc;
Borislav Petkov6d29c8f2008-02-02 19:56:49 +01003440
Linus Torvalds1da177e2005-04-16 15:20:36 -07003441 idetape_create_inquiry_cmd(&pc);
3442 if (idetape_queue_pc_tail(drive, &pc)) {
Borislav Petkov6d29c8f2008-02-02 19:56:49 +01003443 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
3444 tape->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003445 return;
3446 }
Borislav Petkov6d29c8f2008-02-02 19:56:49 +01003447 memcpy(tape->vendor_id, &pc.buffer[8], 8);
3448 memcpy(tape->product_id, &pc.buffer[16], 16);
3449 memcpy(tape->firmware_revision, &pc.buffer[32], 4);
3450
Linus Torvalds1da177e2005-04-16 15:20:36 -07003451 ide_fixstring(tape->vendor_id, 10, 0);
3452 ide_fixstring(tape->product_id, 18, 0);
3453 ide_fixstring(tape->firmware_revision, 6, 0);
3454 r = tape->firmware_revision;
3455 if (*(r + 1) == '.')
Borislav Petkov6d29c8f2008-02-02 19:56:49 +01003456 tape->firmware_revision_num = (*r - '0') * 100 +
3457 (*(r + 2) - '0') * 10 + *(r + 3) - '0';
3458 printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n",
3459 drive->name, tape->name, tape->vendor_id,
3460 tape->product_id, tape->firmware_revision);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003461}
3462
3463/*
Borislav Petkovb6422012008-02-02 19:56:49 +01003464 * Ask the tape about its various parameters. In particular, we will adjust our
3465 * data transfer buffer size to the recommended value as returned by the tape.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003466 */
3467static void idetape_get_mode_sense_results (ide_drive_t *drive)
3468{
3469 idetape_tape_t *tape = drive->driver_data;
3470 idetape_pc_t pc;
Borislav Petkovb6422012008-02-02 19:56:49 +01003471 u8 *caps;
3472 u8 speed, max_speed;
Borislav Petkov47314fa2008-02-02 19:56:48 +01003473
Linus Torvalds1da177e2005-04-16 15:20:36 -07003474 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
3475 if (idetape_queue_pc_tail(drive, &pc)) {
Borislav Petkovb6422012008-02-02 19:56:49 +01003476 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
3477 " some default values\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003478 tape->tape_block_size = 512;
Borislav Petkovb6422012008-02-02 19:56:49 +01003479 put_unaligned(52, (u16 *)&tape->caps[12]);
3480 put_unaligned(540, (u16 *)&tape->caps[14]);
3481 put_unaligned(6*52, (u16 *)&tape->caps[16]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003482 return;
3483 }
Borislav Petkovb6422012008-02-02 19:56:49 +01003484 caps = pc.buffer + 4 + pc.buffer[3];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003485
Borislav Petkovb6422012008-02-02 19:56:49 +01003486 /* convert to host order and save for later use */
3487 speed = be16_to_cpu(*(u16 *)&caps[14]);
3488 max_speed = be16_to_cpu(*(u16 *)&caps[8]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003489
Borislav Petkovb6422012008-02-02 19:56:49 +01003490 put_unaligned(max_speed, (u16 *)&caps[8]);
3491 put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]);
3492 put_unaligned(speed, (u16 *)&caps[14]);
3493 put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]);
3494
3495 if (!speed) {
3496 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
3497 "(assuming 650KB/sec)\n", drive->name);
3498 put_unaligned(650, (u16 *)&caps[14]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003499 }
Borislav Petkovb6422012008-02-02 19:56:49 +01003500 if (!max_speed) {
3501 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
3502 "(assuming 650KB/sec)\n", drive->name);
3503 put_unaligned(650, (u16 *)&caps[8]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003504 }
3505
Borislav Petkovb6422012008-02-02 19:56:49 +01003506 memcpy(&tape->caps, caps, 20);
3507 if (caps[7] & 0x02)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003508 tape->tape_block_size = 512;
Borislav Petkovb6422012008-02-02 19:56:49 +01003509 else if (caps[7] & 0x04)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003510 tape->tape_block_size = 1024;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003511}
3512
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02003513#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07003514static void idetape_add_settings (ide_drive_t *drive)
3515{
3516 idetape_tape_t *tape = drive->driver_data;
3517
3518/*
Bartlomiej Zolnierkiewicz14979432007-05-10 00:01:10 +02003519 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
Linus Torvalds1da177e2005-04-16 15:20:36 -07003520 */
Borislav Petkovb6422012008-02-02 19:56:49 +01003521 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
3522 1, 2, (u16 *)&tape->caps[16], NULL);
Bartlomiej Zolnierkiewicz14979432007-05-10 00:01:10 +02003523 ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
3524 ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL);
3525 ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
3526 ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL);
3527 ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL);
Borislav Petkovb6422012008-02-02 19:56:49 +01003528 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
3529 1, 1, (u16 *)&tape->caps[14], NULL);
Bartlomiej Zolnierkiewicz14979432007-05-10 00:01:10 +02003530 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL);
3531 ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL);
3532 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
3533 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL);
3534 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL);
3535 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL);
Borislav Petkov8004a8c2008-02-06 02:57:51 +01003536 ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1,
3537 1, &tape->debug_mask, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003538}
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02003539#else
3540static inline void idetape_add_settings(ide_drive_t *drive) { ; }
3541#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003542
3543/*
3544 * ide_setup is called to:
3545 *
3546 * 1. Initialize our various state variables.
3547 * 2. Ask the tape for its capabilities.
3548 * 3. Allocate a buffer which will be used for data
3549 * transfer. The buffer size is chosen based on
3550 * the recommendation which we received in step (2).
3551 *
3552 * Note that at this point ide.c already assigned us an irq, so that
3553 * we can queue requests here and wait for their completion.
3554 */
3555static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
3556{
3557 unsigned long t1, tmid, tn, t;
3558 int speed;
3559 struct idetape_id_gcw gcw;
3560 int stage_size;
3561 struct sysinfo si;
Borislav Petkovb6422012008-02-02 19:56:49 +01003562 u16 *ctl = (u16 *)&tape->caps[12];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003563
3564 spin_lock_init(&tape->spinlock);
3565 drive->dsc_overlap = 1;
Bartlomiej Zolnierkiewicz4166c192008-02-01 23:09:30 +01003566 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
3567 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
3568 tape->name);
3569 drive->dsc_overlap = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003570 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003571 /* Seagate Travan drives do not support DSC overlap. */
3572 if (strstr(drive->id->model, "Seagate STT3401"))
3573 drive->dsc_overlap = 0;
3574 tape->minor = minor;
3575 tape->name[0] = 'h';
3576 tape->name[1] = 't';
3577 tape->name[2] = '0' + minor;
3578 tape->chrdev_direction = idetape_direction_none;
3579 tape->pc = tape->pc_stack;
3580 tape->max_insert_speed = 10000;
3581 tape->speed_control = 1;
3582 *((unsigned short *) &gcw) = drive->id->config;
3583 if (gcw.drq_type == 1)
3584 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags);
3585
3586 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10;
3587
3588 idetape_get_inquiry_results(drive);
3589 idetape_get_mode_sense_results(drive);
Borislav Petkov3cffb9c2008-02-02 19:56:50 +01003590 ide_tape_get_bsize_from_bdesc(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003591 tape->user_bs_factor = 1;
Borislav Petkovb6422012008-02-02 19:56:49 +01003592 tape->stage_size = *ctl * tape->tape_block_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003593 while (tape->stage_size > 0xffff) {
3594 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
Borislav Petkovb6422012008-02-02 19:56:49 +01003595 *ctl /= 2;
3596 tape->stage_size = *ctl * tape->tape_block_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003597 }
3598 stage_size = tape->stage_size;
3599 tape->pages_per_stage = stage_size / PAGE_SIZE;
3600 if (stage_size % PAGE_SIZE) {
3601 tape->pages_per_stage++;
3602 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
3603 }
3604
Borislav Petkovb6422012008-02-02 19:56:49 +01003605 /* Select the "best" DSC read/write polling freq and pipeline size. */
3606 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003607
3608 tape->max_stages = speed * 1000 * 10 / tape->stage_size;
3609
3610 /*
3611 * Limit memory use for pipeline to 10% of physical memory
3612 */
3613 si_meminfo(&si);
3614 if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10)
3615 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size);
3616 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
3617 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
3618 tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
3619 if (tape->max_stages == 0)
3620 tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1;
3621
3622 t1 = (tape->stage_size * HZ) / (speed * 1000);
Borislav Petkovb6422012008-02-02 19:56:49 +01003623 tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003624 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
3625
3626 if (tape->max_stages)
3627 t = tn;
3628 else
3629 t = t1;
3630
3631 /*
3632 * Ensure that the number we got makes sense; limit
3633 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
3634 */
3635 tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN);
3636 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
3637 "%dkB pipeline, %lums tDSC%s\n",
Borislav Petkovb6422012008-02-02 19:56:49 +01003638 drive->name, tape->name, *(u16 *)&tape->caps[14],
3639 (*(u16 *)&tape->caps[16] * 512) / tape->stage_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003640 tape->stage_size / 1024,
3641 tape->max_stages * tape->stage_size / 1024,
3642 tape->best_dsc_rw_frequency * 1000 / HZ,
3643 drive->using_dma ? ", DMA":"");
3644
3645 idetape_add_settings(drive);
3646}
3647
Russell King4031bbe2006-01-06 11:41:00 +00003648static void ide_tape_remove(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003649{
3650 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003651
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02003652 ide_proc_unregister_driver(drive, tape->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003653
3654 ide_unregister_region(tape->disk);
3655
3656 ide_tape_put(tape);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003657}
3658
3659static void ide_tape_release(struct kref *kref)
3660{
3661 struct ide_tape_obj *tape = to_ide_tape(kref);
3662 ide_drive_t *drive = tape->drive;
3663 struct gendisk *g = tape->disk;
3664
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02003665 BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
3666
Linus Torvalds1da177e2005-04-16 15:20:36 -07003667 drive->dsc_overlap = 0;
3668 drive->driver_data = NULL;
Tony Jonesdbc12722007-09-25 02:03:03 +02003669 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
3670 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003671 idetape_devs[tape->minor] = NULL;
3672 g->private_data = NULL;
3673 put_disk(g);
3674 kfree(tape);
3675}
3676
Bartlomiej Zolnierkiewiczecfd80e2007-05-10 00:01:09 +02003677#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07003678static int proc_idetape_read_name
3679 (char *page, char **start, off_t off, int count, int *eof, void *data)
3680{
3681 ide_drive_t *drive = (ide_drive_t *) data;
3682 idetape_tape_t *tape = drive->driver_data;
3683 char *out = page;
3684 int len;
3685
3686 len = sprintf(out, "%s\n", tape->name);
3687 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
3688}
3689
3690static ide_proc_entry_t idetape_proc[] = {
3691 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
3692 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
3693 { NULL, 0, NULL, NULL }
3694};
Linus Torvalds1da177e2005-04-16 15:20:36 -07003695#endif
3696
Russell King4031bbe2006-01-06 11:41:00 +00003697static int ide_tape_probe(ide_drive_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003698
Linus Torvalds1da177e2005-04-16 15:20:36 -07003699static ide_driver_t idetape_driver = {
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02003700 .gen_driver = {
Laurent Riffard4ef3b8f2005-11-18 22:15:40 +01003701 .owner = THIS_MODULE,
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02003702 .name = "ide-tape",
3703 .bus = &ide_bus_type,
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02003704 },
Russell King4031bbe2006-01-06 11:41:00 +00003705 .probe = ide_tape_probe,
3706 .remove = ide_tape_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003707 .version = IDETAPE_VERSION,
3708 .media = ide_tape,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003709 .supports_dsc_overlap = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003710 .do_request = idetape_do_request,
3711 .end_request = idetape_end_request,
3712 .error = __ide_error,
3713 .abort = __ide_abort,
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02003714#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07003715 .proc = idetape_proc,
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02003716#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003717};
3718
3719/*
3720 * Our character device supporting functions, passed to register_chrdev.
3721 */
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08003722static const struct file_operations idetape_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003723 .owner = THIS_MODULE,
3724 .read = idetape_chrdev_read,
3725 .write = idetape_chrdev_write,
3726 .ioctl = idetape_chrdev_ioctl,
3727 .open = idetape_chrdev_open,
3728 .release = idetape_chrdev_release,
3729};
3730
3731static int idetape_open(struct inode *inode, struct file *filp)
3732{
3733 struct gendisk *disk = inode->i_bdev->bd_disk;
3734 struct ide_tape_obj *tape;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003735
3736 if (!(tape = ide_tape_get(disk)))
3737 return -ENXIO;
3738
Linus Torvalds1da177e2005-04-16 15:20:36 -07003739 return 0;
3740}
3741
3742static int idetape_release(struct inode *inode, struct file *filp)
3743{
3744 struct gendisk *disk = inode->i_bdev->bd_disk;
3745 struct ide_tape_obj *tape = ide_tape_g(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003746
3747 ide_tape_put(tape);
3748
3749 return 0;
3750}
3751
3752static int idetape_ioctl(struct inode *inode, struct file *file,
3753 unsigned int cmd, unsigned long arg)
3754{
3755 struct block_device *bdev = inode->i_bdev;
3756 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
3757 ide_drive_t *drive = tape->drive;
3758 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
3759 if (err == -EINVAL)
3760 err = idetape_blkdev_ioctl(drive, cmd, arg);
3761 return err;
3762}
3763
3764static struct block_device_operations idetape_block_ops = {
3765 .owner = THIS_MODULE,
3766 .open = idetape_open,
3767 .release = idetape_release,
3768 .ioctl = idetape_ioctl,
3769};
3770
Russell King4031bbe2006-01-06 11:41:00 +00003771static int ide_tape_probe(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003772{
3773 idetape_tape_t *tape;
3774 struct gendisk *g;
3775 int minor;
3776
3777 if (!strstr("ide-tape", drive->driver_req))
3778 goto failed;
3779 if (!drive->present)
3780 goto failed;
3781 if (drive->media != ide_tape)
3782 goto failed;
3783 if (!idetape_identify_device (drive)) {
3784 printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
3785 goto failed;
3786 }
3787 if (drive->scsi) {
3788 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name);
3789 goto failed;
3790 }
3791 if (strstr(drive->id->model, "OnStream DI-")) {
3792 printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name);
3793 printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n");
3794 }
Robert P. J. Day5cbded52006-12-13 00:35:56 -08003795 tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003796 if (tape == NULL) {
3797 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
3798 goto failed;
3799 }
3800
3801 g = alloc_disk(1 << PARTN_BITS);
3802 if (!g)
3803 goto out_free_tape;
3804
3805 ide_init_disk(g, drive);
3806
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02003807 ide_proc_register_driver(drive, &idetape_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003808
Linus Torvalds1da177e2005-04-16 15:20:36 -07003809 kref_init(&tape->kref);
3810
3811 tape->drive = drive;
3812 tape->driver = &idetape_driver;
3813 tape->disk = g;
3814
3815 g->private_data = &tape->driver;
3816
3817 drive->driver_data = tape;
3818
Arjan van de Vencf8b8972006-03-23 03:00:45 -08003819 mutex_lock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003820 for (minor = 0; idetape_devs[minor]; minor++)
3821 ;
3822 idetape_devs[minor] = tape;
Arjan van de Vencf8b8972006-03-23 03:00:45 -08003823 mutex_unlock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003824
3825 idetape_setup(drive, tape, minor);
3826
Tony Jonesdbc12722007-09-25 02:03:03 +02003827 device_create(idetape_sysfs_class, &drive->gendev,
3828 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name);
3829 device_create(idetape_sysfs_class, &drive->gendev,
3830 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name);
Will Dysond5dee802005-09-16 02:55:07 -07003831
Linus Torvalds1da177e2005-04-16 15:20:36 -07003832 g->fops = &idetape_block_ops;
3833 ide_register_region(g);
3834
3835 return 0;
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02003836
Linus Torvalds1da177e2005-04-16 15:20:36 -07003837out_free_tape:
3838 kfree(tape);
3839failed:
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02003840 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003841}
3842
3843MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
3844MODULE_LICENSE("GPL");
3845
3846static void __exit idetape_exit (void)
3847{
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02003848 driver_unregister(&idetape_driver.gen_driver);
Will Dysond5dee802005-09-16 02:55:07 -07003849 class_destroy(idetape_sysfs_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003850 unregister_chrdev(IDETAPE_MAJOR, "ht");
3851}
3852
Bartlomiej Zolnierkiewicz17514e82005-11-19 22:24:35 +01003853static int __init idetape_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003854{
Will Dysond5dee802005-09-16 02:55:07 -07003855 int error = 1;
3856 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
3857 if (IS_ERR(idetape_sysfs_class)) {
3858 idetape_sysfs_class = NULL;
3859 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
3860 error = -EBUSY;
3861 goto out;
3862 }
3863
Linus Torvalds1da177e2005-04-16 15:20:36 -07003864 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
3865 printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
Will Dysond5dee802005-09-16 02:55:07 -07003866 error = -EBUSY;
3867 goto out_free_class;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003868 }
Will Dysond5dee802005-09-16 02:55:07 -07003869
3870 error = driver_register(&idetape_driver.gen_driver);
3871 if (error)
3872 goto out_free_driver;
3873
3874 return 0;
3875
3876out_free_driver:
3877 driver_unregister(&idetape_driver.gen_driver);
3878out_free_class:
3879 class_destroy(idetape_sysfs_class);
3880out:
3881 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003882}
3883
Kay Sievers263756e2005-12-12 18:03:44 +01003884MODULE_ALIAS("ide:*m-tape*");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003885module_init(idetape_init);
3886module_exit(idetape_exit);
3887MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);