Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
5ce78af4 BP |
2 | * IDE ATAPI streaming tape driver. |
3 | * | |
59bca8cc BZ |
4 | * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> |
5 | * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz | |
1da177e4 | 6 | * |
1da177e4 LT |
7 | * This driver was constructed as a student project in the software laboratory |
8 | * of the faculty of electrical engineering in the Technion - Israel's | |
9 | * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. | |
10 | * | |
11 | * It is hereby placed under the terms of the GNU general public license. | |
12 | * (See linux/COPYING). | |
1da177e4 | 13 | * |
5ce78af4 BP |
14 | * For a historical changelog see |
15 | * Documentation/ide/ChangeLog.ide-tape.1995-2002 | |
1da177e4 LT |
16 | */ |
17 | ||
51509eec BZ |
18 | #define DRV_NAME "ide-tape" |
19 | ||
dfe79936 | 20 | #define IDETAPE_VERSION "1.20" |
1da177e4 | 21 | |
1da177e4 LT |
22 | #include <linux/module.h> |
23 | #include <linux/types.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/timer.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/interrupt.h> | |
9bae1ff3 | 30 | #include <linux/jiffies.h> |
1da177e4 | 31 | #include <linux/major.h> |
1da177e4 LT |
32 | #include <linux/errno.h> |
33 | #include <linux/genhd.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/pci.h> | |
36 | #include <linux/ide.h> | |
37 | #include <linux/smp_lock.h> | |
38 | #include <linux/completion.h> | |
39 | #include <linux/bitops.h> | |
cf8b8975 | 40 | #include <linux/mutex.h> |
90699ce2 | 41 | #include <scsi/scsi.h> |
1da177e4 LT |
42 | |
43 | #include <asm/byteorder.h> | |
c837cfa5 BP |
44 | #include <linux/irq.h> |
45 | #include <linux/uaccess.h> | |
46 | #include <linux/io.h> | |
1da177e4 | 47 | #include <asm/unaligned.h> |
1da177e4 LT |
48 | #include <linux/mtio.h> |
49 | ||
8004a8c9 BP |
50 | enum { |
51 | /* output errors only */ | |
52 | DBG_ERR = (1 << 0), | |
53 | /* output all sense key/asc */ | |
54 | DBG_SENSE = (1 << 1), | |
55 | /* info regarding all chrdev-related procedures */ | |
56 | DBG_CHRDEV = (1 << 2), | |
57 | /* all remaining procedures */ | |
58 | DBG_PROCS = (1 << 3), | |
8004a8c9 BP |
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 | ||
1da177e4 | 74 | /**************************** Tunable parameters *****************************/ |
1da177e4 | 75 | /* |
3c98bf34 BP |
76 | * After each failed packet command we issue a request sense command and retry |
77 | * the packet command IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 78 | * |
3c98bf34 | 79 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
1da177e4 LT |
80 | */ |
81 | #define IDETAPE_MAX_PC_RETRIES 3 | |
82 | ||
83 | /* | |
3c98bf34 BP |
84 | * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE |
85 | * bytes. This is used for several packet commands (Not for READ/WRITE commands) | |
1da177e4 LT |
86 | */ |
87 | #define IDETAPE_PC_BUFFER_SIZE 256 | |
88 | ||
1da177e4 LT |
89 | /* |
90 | * Some drives (for example, Seagate STT3401A Travan) require a very long | |
91 | * timeout, because they don't return an interrupt or clear their busy bit | |
92 | * until after the command completes (even retension commands). | |
93 | */ | |
94 | #define IDETAPE_WAIT_CMD (900*HZ) | |
95 | ||
96 | /* | |
3c98bf34 BP |
97 | * The following parameter is used to select the point in the internal tape fifo |
98 | * in which we will start to refill the buffer. Decreasing the following | |
99 | * parameter will improve the system's latency and interactive response, while | |
100 | * using a high value might improve system throughput. | |
1da177e4 | 101 | */ |
3c98bf34 | 102 | #define IDETAPE_FIFO_THRESHOLD 2 |
1da177e4 LT |
103 | |
104 | /* | |
3c98bf34 | 105 | * DSC polling parameters. |
1da177e4 | 106 | * |
3c98bf34 BP |
107 | * Polling for DSC (a single bit in the status register) is a very important |
108 | * function in ide-tape. There are two cases in which we poll for DSC: | |
1da177e4 | 109 | * |
3c98bf34 BP |
110 | * 1. Before a read/write packet command, to ensure that we can transfer data |
111 | * from/to the tape's data buffers, without causing an actual media access. | |
112 | * In case the tape is not ready yet, we take out our request from the device | |
113 | * request queue, so that ide.c could service requests from the other device | |
114 | * on the same interface in the meantime. | |
1da177e4 | 115 | * |
3c98bf34 BP |
116 | * 2. After the successful initialization of a "media access packet command", |
117 | * which is a command that can take a long time to complete (the interval can | |
118 | * range from several seconds to even an hour). Again, we postpone our request | |
119 | * in the middle to free the bus for the other device. The polling frequency | |
120 | * here should be lower than the read/write frequency since those media access | |
121 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST | |
122 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD | |
123 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). | |
1da177e4 | 124 | * |
3c98bf34 BP |
125 | * We also set a timeout for the timer, in case something goes wrong. The |
126 | * timeout should be longer then the maximum execution time of a tape operation. | |
1da177e4 | 127 | */ |
3c98bf34 BP |
128 | |
129 | /* DSC timings. */ | |
1da177e4 LT |
130 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
131 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ | |
132 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ | |
133 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ | |
134 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ | |
135 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ | |
136 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ | |
137 | ||
138 | /*************************** End of tunable parameters ***********************/ | |
139 | ||
54abf37e BP |
140 | /* tape directions */ |
141 | enum { | |
142 | IDETAPE_DIR_NONE = (1 << 0), | |
143 | IDETAPE_DIR_READ = (1 << 1), | |
144 | IDETAPE_DIR_WRITE = (1 << 2), | |
145 | }; | |
1da177e4 LT |
146 | |
147 | struct idetape_bh { | |
ab057968 | 148 | u32 b_size; |
1da177e4 LT |
149 | atomic_t b_count; |
150 | struct idetape_bh *b_reqnext; | |
151 | char *b_data; | |
152 | }; | |
153 | ||
03056b90 BP |
154 | /* Tape door status */ |
155 | #define DOOR_UNLOCKED 0 | |
156 | #define DOOR_LOCKED 1 | |
157 | #define DOOR_EXPLICITLY_LOCKED 2 | |
158 | ||
159 | /* Some defines for the SPACE command */ | |
160 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
161 | #define IDETAPE_SPACE_TO_EOD 3 | |
162 | ||
163 | /* Some defines for the LOAD UNLOAD command */ | |
164 | #define IDETAPE_LU_LOAD_MASK 1 | |
165 | #define IDETAPE_LU_RETENSION_MASK 2 | |
166 | #define IDETAPE_LU_EOT_MASK 4 | |
167 | ||
168 | /* | |
169 | * Special requests for our block device strategy routine. | |
170 | * | |
171 | * In order to service a character device command, we add special requests to | |
172 | * the tail of our block device request queue and wait for their completion. | |
173 | */ | |
174 | ||
175 | enum { | |
176 | REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ | |
177 | REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ | |
178 | REQ_IDETAPE_READ = (1 << 2), | |
179 | REQ_IDETAPE_WRITE = (1 << 3), | |
180 | }; | |
181 | ||
182 | /* Error codes returned in rq->errors to the higher part of the driver. */ | |
183 | #define IDETAPE_ERROR_GENERAL 101 | |
184 | #define IDETAPE_ERROR_FILEMARK 102 | |
185 | #define IDETAPE_ERROR_EOD 103 | |
186 | ||
187 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ | |
188 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
189 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
190 | ||
1da177e4 | 191 | /* |
3c98bf34 BP |
192 | * Most of our global data which we need to save even as we leave the driver due |
193 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
194 | */ |
195 | typedef struct ide_tape_obj { | |
196 | ide_drive_t *drive; | |
197 | ide_driver_t *driver; | |
198 | struct gendisk *disk; | |
199 | struct kref kref; | |
200 | ||
201 | /* | |
1da177e4 LT |
202 | * pc points to the current processed packet command. |
203 | * | |
204 | * failed_pc points to the last failed packet command, or contains | |
205 | * NULL if we do not need to retry any packet command. This is | |
206 | * required since an additional packet command is needed before the | |
207 | * retry, to get detailed information on what went wrong. | |
208 | */ | |
209 | /* Current packet command */ | |
d236d74c | 210 | struct ide_atapi_pc *pc; |
1da177e4 | 211 | /* Last failed packet command */ |
d236d74c | 212 | struct ide_atapi_pc *failed_pc; |
2e8a6f89 BZ |
213 | /* used by REQ_IDETAPE_{READ,WRITE} requests */ |
214 | struct ide_atapi_pc queued_pc; | |
394a4c21 | 215 | |
2e8a6f89 | 216 | struct ide_atapi_pc request_sense_pc; |
394a4c21 | 217 | struct request request_sense_rq; |
1da177e4 LT |
218 | |
219 | /* | |
3c98bf34 | 220 | * DSC polling variables. |
1da177e4 | 221 | * |
3c98bf34 BP |
222 | * While polling for DSC we use postponed_rq to postpone the current |
223 | * request so that ide.c will be able to service pending requests on the | |
224 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 225 | * data transfer) request in the device request queue. |
1da177e4 LT |
226 | */ |
227 | struct request *postponed_rq; | |
228 | /* The time in which we started polling for DSC */ | |
229 | unsigned long dsc_polling_start; | |
230 | /* Timer used to poll for dsc */ | |
231 | struct timer_list dsc_timer; | |
232 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
233 | unsigned long best_dsc_rw_freq; |
234 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
235 | unsigned long dsc_timeout; |
236 | ||
3c98bf34 | 237 | /* Read position information */ |
1da177e4 LT |
238 | u8 partition; |
239 | /* Current block */ | |
54bb2074 | 240 | unsigned int first_frame; |
1da177e4 | 241 | |
3c98bf34 | 242 | /* Last error information */ |
1da177e4 LT |
243 | u8 sense_key, asc, ascq; |
244 | ||
3c98bf34 | 245 | /* Character device operation */ |
1da177e4 LT |
246 | unsigned int minor; |
247 | /* device name */ | |
248 | char name[4]; | |
249 | /* Current character device data transfer direction */ | |
54abf37e | 250 | u8 chrdev_dir; |
1da177e4 | 251 | |
54bb2074 BP |
252 | /* tape block size, usually 512 or 1024 bytes */ |
253 | unsigned short blk_size; | |
1da177e4 | 254 | int user_bs_factor; |
b6422013 | 255 | |
1da177e4 | 256 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 257 | u8 caps[20]; |
1da177e4 LT |
258 | |
259 | /* | |
3c98bf34 | 260 | * Active data transfer request parameters. |
1da177e4 | 261 | * |
3c98bf34 BP |
262 | * At most, there is only one ide-tape originated data transfer request |
263 | * in the device request queue. This allows ide.c to easily service | |
264 | * requests from the other device when we postpone our active request. | |
1da177e4 | 265 | */ |
83042b24 | 266 | |
3c98bf34 | 267 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 268 | int buffer_size; |
077e3bdb BP |
269 | /* merge buffer */ |
270 | struct idetape_bh *merge_bh; | |
01a63aeb BP |
271 | /* size of the merge buffer */ |
272 | int merge_bh_size; | |
077e3bdb | 273 | /* pointer to current buffer head within the merge buffer */ |
1da177e4 LT |
274 | struct idetape_bh *bh; |
275 | char *b_data; | |
276 | int b_count; | |
3c98bf34 | 277 | |
a997a435 | 278 | int pages_per_buffer; |
1da177e4 LT |
279 | /* Wasted space in each stage */ |
280 | int excess_bh_size; | |
281 | ||
1da177e4 | 282 | /* protects the ide-tape queue */ |
54bb2074 | 283 | spinlock_t lock; |
1da177e4 | 284 | |
3c98bf34 | 285 | /* Measures average tape speed */ |
1da177e4 LT |
286 | unsigned long avg_time; |
287 | int avg_size; | |
288 | int avg_speed; | |
289 | ||
1da177e4 LT |
290 | /* the door is currently locked */ |
291 | int door_locked; | |
292 | /* the tape hardware is write protected */ | |
293 | char drv_write_prot; | |
294 | /* the tape is write protected (hardware or opened as read-only) */ | |
295 | char write_prot; | |
296 | ||
8004a8c9 | 297 | u32 debug_mask; |
1da177e4 LT |
298 | } idetape_tape_t; |
299 | ||
cf8b8975 | 300 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 301 | |
d5dee80a WD |
302 | static struct class *idetape_sysfs_class; |
303 | ||
1da177e4 LT |
304 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
305 | ||
306 | #define ide_tape_g(disk) \ | |
307 | container_of((disk)->private_data, struct ide_tape_obj, driver) | |
308 | ||
08da591e BZ |
309 | static void ide_tape_release(struct kref *); |
310 | ||
1da177e4 LT |
311 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
312 | { | |
313 | struct ide_tape_obj *tape = NULL; | |
314 | ||
cf8b8975 | 315 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 316 | tape = ide_tape_g(disk); |
08da591e | 317 | if (tape) { |
d3e33ff5 | 318 | if (ide_device_get(tape->drive)) |
08da591e | 319 | tape = NULL; |
d3e33ff5 BZ |
320 | else |
321 | kref_get(&tape->kref); | |
08da591e | 322 | } |
cf8b8975 | 323 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
324 | return tape; |
325 | } | |
326 | ||
1da177e4 LT |
327 | static void ide_tape_put(struct ide_tape_obj *tape) |
328 | { | |
d3e33ff5 BZ |
329 | ide_drive_t *drive = tape->drive; |
330 | ||
cf8b8975 | 331 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 332 | kref_put(&tape->kref, ide_tape_release); |
d3e33ff5 | 333 | ide_device_put(drive); |
cf8b8975 | 334 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
335 | } |
336 | ||
1da177e4 | 337 | /* |
3c98bf34 BP |
338 | * The variables below are used for the character device interface. Additional |
339 | * state variables are defined in our ide_drive_t structure. | |
1da177e4 | 340 | */ |
5a04cfa9 | 341 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
1da177e4 LT |
342 | |
343 | #define ide_tape_f(file) ((file)->private_data) | |
344 | ||
345 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) | |
346 | { | |
347 | struct ide_tape_obj *tape = NULL; | |
348 | ||
cf8b8975 | 349 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
350 | tape = idetape_devs[i]; |
351 | if (tape) | |
352 | kref_get(&tape->kref); | |
cf8b8975 | 353 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
354 | return tape; |
355 | } | |
356 | ||
d236d74c | 357 | static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 358 | unsigned int bcount) |
1da177e4 LT |
359 | { |
360 | struct idetape_bh *bh = pc->bh; | |
361 | int count; | |
362 | ||
363 | while (bcount) { | |
1da177e4 LT |
364 | if (bh == NULL) { |
365 | printk(KERN_ERR "ide-tape: bh == NULL in " | |
366 | "idetape_input_buffers\n"); | |
9f87abe8 | 367 | ide_pad_transfer(drive, 0, bcount); |
1da177e4 LT |
368 | return; |
369 | } | |
5a04cfa9 BP |
370 | count = min( |
371 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
372 | bcount); | |
374e042c | 373 | drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data + |
5a04cfa9 | 374 | atomic_read(&bh->b_count), count); |
1da177e4 LT |
375 | bcount -= count; |
376 | atomic_add(count, &bh->b_count); | |
377 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
378 | bh = bh->b_reqnext; | |
379 | if (bh) | |
380 | atomic_set(&bh->b_count, 0); | |
381 | } | |
382 | } | |
383 | pc->bh = bh; | |
384 | } | |
385 | ||
d236d74c | 386 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 387 | unsigned int bcount) |
1da177e4 LT |
388 | { |
389 | struct idetape_bh *bh = pc->bh; | |
390 | int count; | |
391 | ||
392 | while (bcount) { | |
1da177e4 | 393 | if (bh == NULL) { |
5a04cfa9 BP |
394 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
395 | __func__); | |
1da177e4 LT |
396 | return; |
397 | } | |
1da177e4 | 398 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
374e042c | 399 | drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); |
1da177e4 LT |
400 | bcount -= count; |
401 | pc->b_data += count; | |
402 | pc->b_count -= count; | |
403 | if (!pc->b_count) { | |
5a04cfa9 BP |
404 | bh = bh->b_reqnext; |
405 | pc->bh = bh; | |
1da177e4 LT |
406 | if (bh) { |
407 | pc->b_data = bh->b_data; | |
408 | pc->b_count = atomic_read(&bh->b_count); | |
409 | } | |
410 | } | |
411 | } | |
412 | } | |
413 | ||
646c0cb6 | 414 | static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
415 | { |
416 | struct idetape_bh *bh = pc->bh; | |
417 | int count; | |
d236d74c | 418 | unsigned int bcount = pc->xferred; |
1da177e4 | 419 | |
346331f8 | 420 | if (pc->flags & PC_FLAG_WRITING) |
1da177e4 LT |
421 | return; |
422 | while (bcount) { | |
1da177e4 | 423 | if (bh == NULL) { |
5a04cfa9 BP |
424 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
425 | __func__); | |
1da177e4 LT |
426 | return; |
427 | } | |
1da177e4 LT |
428 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
429 | atomic_set(&bh->b_count, count); | |
430 | if (atomic_read(&bh->b_count) == bh->b_size) | |
431 | bh = bh->b_reqnext; | |
432 | bcount -= count; | |
433 | } | |
434 | pc->bh = bh; | |
435 | } | |
436 | ||
1da177e4 | 437 | /* |
1b5db434 BP |
438 | * called on each failed packet command retry to analyze the request sense. We |
439 | * currently do not utilize this information. | |
1da177e4 | 440 | */ |
1b5db434 | 441 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
442 | { |
443 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 444 | struct ide_atapi_pc *pc = tape->failed_pc; |
1da177e4 | 445 | |
1b5db434 BP |
446 | tape->sense_key = sense[2] & 0xF; |
447 | tape->asc = sense[12]; | |
448 | tape->ascq = sense[13]; | |
8004a8c9 BP |
449 | |
450 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
451 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 452 | |
d236d74c | 453 | /* Correct pc->xferred by asking the tape. */ |
346331f8 | 454 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
d236d74c | 455 | pc->xferred = pc->req_xfer - |
54bb2074 | 456 | tape->blk_size * |
5d0cc8ae | 457 | get_unaligned_be32(&sense[3]); |
646c0cb6 | 458 | idetape_update_buffers(drive, pc); |
1da177e4 LT |
459 | } |
460 | ||
461 | /* | |
462 | * If error was the result of a zero-length read or write command, | |
463 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
464 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
465 | */ | |
90699ce2 | 466 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
467 | /* length == 0 */ |
468 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
469 | if (tape->sense_key == 5) { | |
1da177e4 LT |
470 | /* don't report an error, everything's ok */ |
471 | pc->error = 0; | |
472 | /* don't retry read/write */ | |
346331f8 | 473 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
474 | } |
475 | } | |
90699ce2 | 476 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
1da177e4 | 477 | pc->error = IDETAPE_ERROR_FILEMARK; |
346331f8 | 478 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 479 | } |
90699ce2 | 480 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
481 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
482 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
1da177e4 | 483 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 484 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
485 | } |
486 | } | |
90699ce2 | 487 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 488 | if (tape->sense_key == 8) { |
1da177e4 | 489 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 490 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 491 | } |
346331f8 | 492 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 493 | pc->xferred) |
1da177e4 LT |
494 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
495 | } | |
496 | } | |
497 | ||
d01dbc3b | 498 | /* Free data buffers completely. */ |
077e3bdb | 499 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) |
1da177e4 | 500 | { |
077e3bdb | 501 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; |
d01dbc3b BP |
502 | |
503 | while (bh) { | |
504 | u32 size = bh->b_size; | |
505 | ||
506 | while (size) { | |
507 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
508 | ||
509 | if (bh->b_data) | |
510 | free_pages((unsigned long)bh->b_data, order); | |
511 | ||
512 | size &= (order-1); | |
513 | bh->b_data += (1 << order) * PAGE_SIZE; | |
1da177e4 LT |
514 | } |
515 | prev_bh = bh; | |
516 | bh = bh->b_reqnext; | |
517 | kfree(prev_bh); | |
518 | } | |
1da177e4 LT |
519 | } |
520 | ||
1da177e4 LT |
521 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
522 | { | |
523 | struct request *rq = HWGROUP(drive)->rq; | |
524 | idetape_tape_t *tape = drive->driver_data; | |
525 | unsigned long flags; | |
526 | int error; | |
1da177e4 | 527 | |
8004a8c9 | 528 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
529 | |
530 | switch (uptodate) { | |
5a04cfa9 BP |
531 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
532 | case 1: error = 0; break; | |
533 | default: error = uptodate; | |
1da177e4 LT |
534 | } |
535 | rq->errors = error; | |
536 | if (error) | |
537 | tape->failed_pc = NULL; | |
538 | ||
3687221f BZ |
539 | if (!blk_special_request(rq)) { |
540 | ide_end_request(drive, uptodate, nr_sects); | |
541 | return 0; | |
542 | } | |
543 | ||
54bb2074 | 544 | spin_lock_irqsave(&tape->lock, flags); |
1da177e4 | 545 | |
1da177e4 | 546 | ide_end_drive_cmd(drive, 0, 0); |
1da177e4 | 547 | |
54bb2074 | 548 | spin_unlock_irqrestore(&tape->lock, flags); |
1da177e4 LT |
549 | return 0; |
550 | } | |
551 | ||
92f5daff | 552 | static void ide_tape_callback(ide_drive_t *drive) |
1da177e4 LT |
553 | { |
554 | idetape_tape_t *tape = drive->driver_data; | |
5985e6ab BZ |
555 | struct ide_atapi_pc *pc = tape->pc; |
556 | int uptodate = pc->error ? 0 : 1; | |
1da177e4 | 557 | |
8004a8c9 BP |
558 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
559 | ||
dd2e9a03 BZ |
560 | if (tape->failed_pc == pc) |
561 | tape->failed_pc = NULL; | |
562 | ||
5985e6ab BZ |
563 | if (pc->c[0] == REQUEST_SENSE) { |
564 | if (uptodate) | |
565 | idetape_analyze_error(drive, pc->buf); | |
566 | else | |
567 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
568 | "itself - Aborting request!\n"); | |
569 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
570 | struct request *rq = drive->hwif->hwgroup->rq; | |
571 | int blocks = pc->xferred / tape->blk_size; | |
572 | ||
573 | tape->avg_size += blocks * tape->blk_size; | |
574 | ||
575 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
576 | tape->avg_speed = tape->avg_size * HZ / | |
577 | (jiffies - tape->avg_time) / 1024; | |
578 | tape->avg_size = 0; | |
579 | tape->avg_time = jiffies; | |
580 | } | |
581 | ||
582 | tape->first_frame += blocks; | |
583 | rq->current_nr_sectors -= blocks; | |
584 | ||
585 | if (pc->error) | |
586 | uptodate = pc->error; | |
587 | } else if (pc->c[0] == READ_POSITION && uptodate) { | |
588 | u8 *readpos = tape->pc->buf; | |
589 | ||
590 | debug_log(DBG_SENSE, "BOP - %s\n", | |
591 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
592 | debug_log(DBG_SENSE, "EOP - %s\n", | |
593 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
594 | ||
595 | if (readpos[0] & 0x4) { | |
596 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
597 | "to the tape\n"); | |
f2e3ab52 | 598 | clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab BZ |
599 | uptodate = 0; |
600 | } else { | |
601 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
cd740ab0 | 602 | be32_to_cpup((__be32 *)&readpos[4])); |
5985e6ab BZ |
603 | |
604 | tape->partition = readpos[1]; | |
cd740ab0 | 605 | tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); |
f2e3ab52 | 606 | set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 607 | } |
1da177e4 | 608 | } |
5985e6ab BZ |
609 | |
610 | idetape_end_request(drive, uptodate, 0); | |
1da177e4 LT |
611 | } |
612 | ||
5985e6ab BZ |
613 | static void idetape_init_pc(struct ide_atapi_pc *pc) |
614 | { | |
615 | memset(pc->c, 0, 12); | |
616 | pc->retries = 0; | |
617 | pc->flags = 0; | |
618 | pc->req_xfer = 0; | |
619 | pc->buf = pc->pc_buf; | |
620 | pc->buf_size = IDETAPE_PC_BUFFER_SIZE; | |
621 | pc->bh = NULL; | |
622 | pc->b_data = NULL; | |
1da177e4 LT |
623 | } |
624 | ||
d236d74c | 625 | static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 626 | { |
5a04cfa9 | 627 | idetape_init_pc(pc); |
90699ce2 | 628 | pc->c[0] = REQUEST_SENSE; |
1da177e4 | 629 | pc->c[4] = 20; |
d236d74c | 630 | pc->req_xfer = 20; |
1da177e4 LT |
631 | } |
632 | ||
1da177e4 | 633 | /* |
3c98bf34 BP |
634 | * Generate a new packet command request in front of the request queue, before |
635 | * the current request, so that it will be processed immediately, on the next | |
394a4c21 | 636 | * pass through the driver. |
1da177e4 | 637 | */ |
d236d74c | 638 | static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 639 | struct request *rq) |
1da177e4 LT |
640 | { |
641 | struct ide_tape_obj *tape = drive->driver_data; | |
642 | ||
f025ffdc BZ |
643 | blk_rq_init(NULL, rq); |
644 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
e8a96aa7 | 645 | rq->cmd_flags |= REQ_PREEMPT; |
1da177e4 LT |
646 | rq->buffer = (char *) pc; |
647 | rq->rq_disk = tape->disk; | |
0014c75b | 648 | memcpy(rq->cmd, pc->c, 12); |
f025ffdc | 649 | rq->cmd[13] = REQ_IDETAPE_PC1; |
63f5abb0 | 650 | ide_do_drive_cmd(drive, rq); |
1da177e4 LT |
651 | } |
652 | ||
653 | /* | |
654 | * idetape_retry_pc is called when an error was detected during the | |
655 | * last packet command. We queue a request sense packet command in | |
656 | * the head of the request list. | |
657 | */ | |
258ec411 | 658 | static void idetape_retry_pc(ide_drive_t *drive) |
1da177e4 | 659 | { |
394a4c21 BZ |
660 | struct ide_tape_obj *tape = drive->driver_data; |
661 | struct request *rq = &tape->request_sense_rq; | |
2e8a6f89 | 662 | struct ide_atapi_pc *pc = &tape->request_sense_pc; |
1da177e4 | 663 | |
64a57fe4 | 664 | (void)ide_read_error(drive); |
1da177e4 | 665 | idetape_create_request_sense_cmd(pc); |
f2e3ab52 | 666 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 | 667 | idetape_queue_pc_head(drive, pc, rq); |
1da177e4 LT |
668 | } |
669 | ||
670 | /* | |
3c98bf34 BP |
671 | * Postpone the current request so that ide.c will be able to service requests |
672 | * from another device on the same hwgroup while we are polling for DSC. | |
1da177e4 | 673 | */ |
5a04cfa9 | 674 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
675 | { |
676 | idetape_tape_t *tape = drive->driver_data; | |
677 | ||
8004a8c9 BP |
678 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
679 | ||
1da177e4 | 680 | tape->postponed_rq = HWGROUP(drive)->rq; |
54bb2074 | 681 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
682 | } |
683 | ||
74e63e74 BZ |
684 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
685 | { | |
686 | idetape_tape_t *tape = drive->driver_data; | |
687 | ||
688 | /* Media access command */ | |
689 | tape->dsc_polling_start = jiffies; | |
690 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
691 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
692 | /* Allow ide.c to handle other requests */ | |
693 | idetape_postpone_request(drive); | |
694 | } | |
695 | ||
acaa0f5f | 696 | static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
08424ac2 BZ |
697 | unsigned int bcount, int write) |
698 | { | |
699 | if (write) | |
700 | idetape_output_buffers(drive, pc, bcount); | |
701 | else | |
702 | idetape_input_buffers(drive, pc, bcount); | |
acaa0f5f BZ |
703 | |
704 | return bcount; | |
08424ac2 | 705 | } |
a1efc85f | 706 | |
1da177e4 | 707 | /* |
a1efc85f BP |
708 | * This is the usual interrupt handler which will be called during a packet |
709 | * command. We will transfer some of the data (as requested by the drive) and | |
710 | * will re-point interrupt handler to us. When data transfer is finished, we | |
711 | * will act according to the algorithm described before | |
8d06bfad | 712 | * idetape_issue_pc. |
1da177e4 | 713 | */ |
a1efc85f | 714 | static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) |
1da177e4 | 715 | { |
1da177e4 | 716 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 717 | |
646c0cb6 BZ |
718 | return ide_pc_intr(drive, tape->pc, idetape_pc_intr, IDETAPE_WAIT_CMD, |
719 | NULL, idetape_update_buffers, idetape_retry_pc, | |
720 | ide_tape_handle_dsc, ide_tape_io_buffers); | |
1da177e4 LT |
721 | } |
722 | ||
723 | /* | |
3c98bf34 | 724 | * Packet Command Interface |
1da177e4 | 725 | * |
3c98bf34 BP |
726 | * The current Packet Command is available in tape->pc, and will not change |
727 | * until we finish handling it. Each packet command is associated with a | |
728 | * callback function that will be called when the command is finished. | |
1da177e4 | 729 | * |
3c98bf34 | 730 | * The handling will be done in three stages: |
1da177e4 | 731 | * |
3c98bf34 BP |
732 | * 1. idetape_issue_pc will send the packet command to the drive, and will set |
733 | * the interrupt handler to idetape_pc_intr. | |
1da177e4 | 734 | * |
3c98bf34 BP |
735 | * 2. On each interrupt, idetape_pc_intr will be called. This step will be |
736 | * repeated until the device signals us that no more interrupts will be issued. | |
1da177e4 | 737 | * |
3c98bf34 BP |
738 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
739 | * process. In case of a successful initiation of a media access packet command, | |
740 | * the DSC bit will be set when the actual execution of the command is finished. | |
741 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
742 | * event. In this case, we define the request as "low priority request" by | |
743 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
744 | * exit the driver. | |
1da177e4 | 745 | * |
3c98bf34 BP |
746 | * ide.c will then give higher priority to requests which originate from the |
747 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 748 | * |
3c98bf34 | 749 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 750 | * |
3c98bf34 BP |
751 | * 5. In case an error was found, we queue a request sense packet command in |
752 | * front of the request queue and retry the operation up to | |
753 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 754 | * |
3c98bf34 BP |
755 | * 6. In case no error was found, or we decided to give up and not to retry |
756 | * again, the callback function will be called and then we will handle the next | |
757 | * request. | |
1da177e4 LT |
758 | */ |
759 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) | |
760 | { | |
1da177e4 | 761 | idetape_tape_t *tape = drive->driver_data; |
9567b349 | 762 | |
594c16d8 BZ |
763 | return ide_transfer_pc(drive, tape->pc, idetape_pc_intr, |
764 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
765 | } |
766 | ||
d236d74c BP |
767 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
768 | struct ide_atapi_pc *pc) | |
1da177e4 | 769 | { |
1da177e4 | 770 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 771 | |
90699ce2 BP |
772 | if (tape->pc->c[0] == REQUEST_SENSE && |
773 | pc->c[0] == REQUEST_SENSE) { | |
1da177e4 LT |
774 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
775 | "Two request sense in serial were issued\n"); | |
776 | } | |
1da177e4 | 777 | |
90699ce2 | 778 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
1da177e4 LT |
779 | tape->failed_pc = pc; |
780 | /* Set the current packet command */ | |
781 | tape->pc = pc; | |
782 | ||
783 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 784 | (pc->flags & PC_FLAG_ABORT)) { |
1da177e4 | 785 | /* |
3c98bf34 BP |
786 | * We will "abort" retrying a packet command in case legitimate |
787 | * error code was received (crossing a filemark, or end of the | |
788 | * media, for example). | |
1da177e4 | 789 | */ |
346331f8 | 790 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 791 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
792 | tape->sense_key == 2 && tape->asc == 4 && |
793 | (tape->ascq == 1 || tape->ascq == 8))) { | |
794 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
795 | "pc = %2x, key = %2x, " | |
796 | "asc = %2x, ascq = %2x\n", | |
797 | tape->name, pc->c[0], | |
798 | tape->sense_key, tape->asc, | |
799 | tape->ascq); | |
800 | } | |
801 | /* Giving up */ | |
802 | pc->error = IDETAPE_ERROR_GENERAL; | |
803 | } | |
804 | tape->failed_pc = NULL; | |
776bb027 | 805 | drive->pc_callback(drive); |
92f5daff | 806 | return ide_stopped; |
1da177e4 | 807 | } |
8004a8c9 | 808 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
809 | |
810 | pc->retries++; | |
1da177e4 | 811 | |
6bf1641c BZ |
812 | return ide_issue_pc(drive, pc, idetape_transfer_pc, |
813 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
814 | } |
815 | ||
3c98bf34 | 816 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 817 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 LT |
818 | { |
819 | idetape_init_pc(pc); | |
90699ce2 | 820 | pc->c[0] = MODE_SENSE; |
1da177e4 | 821 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
822 | /* DBD = 1 - Don't return block descriptors */ |
823 | pc->c[1] = 8; | |
1da177e4 LT |
824 | pc->c[2] = page_code; |
825 | /* | |
826 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
827 | * | |
828 | * For SCSI this byte is defined as subpage instead of high byte | |
829 | * of length and some IDE drives seem to interpret it this way | |
830 | * and return an error when 255 is used. | |
831 | */ | |
832 | pc->c[3] = 0; | |
3c98bf34 BP |
833 | /* We will just discard data in that case */ |
834 | pc->c[4] = 255; | |
1da177e4 | 835 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 836 | pc->req_xfer = 12; |
1da177e4 | 837 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 838 | pc->req_xfer = 24; |
1da177e4 | 839 | else |
d236d74c | 840 | pc->req_xfer = 50; |
1da177e4 LT |
841 | } |
842 | ||
5a04cfa9 | 843 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 844 | { |
b73c7ee2 | 845 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 846 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 847 | struct ide_atapi_pc *pc = tape->pc; |
22c525b9 | 848 | u8 stat; |
1da177e4 | 849 | |
374e042c | 850 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 851 | |
3a7d2484 BZ |
852 | if (stat & ATA_DSC) { |
853 | if (stat & ATA_ERR) { | |
1da177e4 | 854 | /* Error detected */ |
90699ce2 | 855 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
856 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
857 | tape->name); | |
858 | /* Retry operation */ | |
258ec411 BZ |
859 | idetape_retry_pc(drive); |
860 | return ide_stopped; | |
1da177e4 LT |
861 | } |
862 | pc->error = 0; | |
1da177e4 LT |
863 | } else { |
864 | pc->error = IDETAPE_ERROR_GENERAL; | |
865 | tape->failed_pc = NULL; | |
866 | } | |
776bb027 | 867 | drive->pc_callback(drive); |
1da177e4 LT |
868 | return ide_stopped; |
869 | } | |
870 | ||
cd2abbfe | 871 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
872 | struct ide_atapi_pc *pc, struct request *rq, |
873 | u8 opcode) | |
1da177e4 | 874 | { |
0014c75b BP |
875 | struct idetape_bh *bh = (struct idetape_bh *)rq->special; |
876 | unsigned int length = rq->current_nr_sectors; | |
877 | ||
1da177e4 | 878 | idetape_init_pc(pc); |
860ff5ec | 879 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 880 | pc->c[1] = 1; |
1da177e4 | 881 | pc->bh = bh; |
d236d74c BP |
882 | pc->buf = NULL; |
883 | pc->buf_size = length * tape->blk_size; | |
884 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 885 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 886 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 887 | |
cd2abbfe BP |
888 | if (opcode == READ_6) { |
889 | pc->c[0] = READ_6; | |
890 | atomic_set(&bh->b_count, 0); | |
891 | } else if (opcode == WRITE_6) { | |
892 | pc->c[0] = WRITE_6; | |
893 | pc->flags |= PC_FLAG_WRITING; | |
894 | pc->b_data = bh->b_data; | |
895 | pc->b_count = atomic_read(&bh->b_count); | |
896 | } | |
0014c75b BP |
897 | |
898 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
899 | } |
900 | ||
1da177e4 LT |
901 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
902 | struct request *rq, sector_t block) | |
903 | { | |
b73c7ee2 | 904 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 905 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 906 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 907 | struct request *postponed_rq = tape->postponed_rq; |
22c525b9 | 908 | u8 stat; |
1da177e4 | 909 | |
730616b2 MW |
910 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu," |
911 | " current_nr_sectors: %u\n", | |
912 | (unsigned long long)rq->sector, rq->nr_sectors, | |
913 | rq->current_nr_sectors); | |
1da177e4 | 914 | |
4aff5e23 | 915 | if (!blk_special_request(rq)) { |
3c98bf34 | 916 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 917 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 918 | "request queue (%d)\n", drive->name, rq->cmd_type); |
1da177e4 LT |
919 | ide_end_request(drive, 0, 0); |
920 | return ide_stopped; | |
921 | } | |
922 | ||
3c98bf34 | 923 | /* Retry a failed packet command */ |
28c7214b BZ |
924 | if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) { |
925 | pc = tape->failed_pc; | |
926 | goto out; | |
927 | } | |
5a04cfa9 | 928 | |
1da177e4 LT |
929 | if (postponed_rq != NULL) |
930 | if (rq != postponed_rq) { | |
931 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
932 | "Two DSC requests were queued\n"); | |
933 | idetape_end_request(drive, 0, 0); | |
934 | return ide_stopped; | |
935 | } | |
1da177e4 LT |
936 | |
937 | tape->postponed_rq = NULL; | |
938 | ||
939 | /* | |
940 | * If the tape is still busy, postpone our request and service | |
941 | * the other device meanwhile. | |
942 | */ | |
374e042c | 943 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 944 | |
83dd5735 | 945 | if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2)) |
f2e3ab52 | 946 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 LT |
947 | |
948 | if (drive->post_reset == 1) { | |
f2e3ab52 | 949 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 LT |
950 | drive->post_reset = 0; |
951 | } | |
952 | ||
f2e3ab52 | 953 | if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && |
3a7d2484 | 954 | (stat & ATA_DSC) == 0) { |
1da177e4 LT |
955 | if (postponed_rq == NULL) { |
956 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 957 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
958 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
959 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
960 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
961 | tape->name); | |
83dd5735 | 962 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
963 | idetape_media_access_finished(drive); |
964 | return ide_stopped; | |
965 | } else { | |
966 | return ide_do_reset(drive); | |
967 | } | |
5a04cfa9 BP |
968 | } else if (time_after(jiffies, |
969 | tape->dsc_polling_start + | |
970 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 971 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
972 | idetape_postpone_request(drive); |
973 | return ide_stopped; | |
974 | } | |
83dd5735 | 975 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
2e8a6f89 | 976 | pc = &tape->queued_pc; |
0014c75b | 977 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
978 | goto out; |
979 | } | |
83dd5735 | 980 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
2e8a6f89 | 981 | pc = &tape->queued_pc; |
0014c75b | 982 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
983 | goto out; |
984 | } | |
83dd5735 | 985 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
d236d74c | 986 | pc = (struct ide_atapi_pc *) rq->buffer; |
83dd5735 BP |
987 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
988 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
989 | goto out; |
990 | } | |
83dd5735 | 991 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
992 | idetape_media_access_finished(drive); |
993 | return ide_stopped; | |
994 | } | |
995 | BUG(); | |
28c7214b | 996 | |
f2e3ab52 | 997 | out: |
8d06bfad | 998 | return idetape_issue_pc(drive, pc); |
1da177e4 LT |
999 | } |
1000 | ||
1da177e4 | 1001 | /* |
41aa1706 | 1002 | * The function below uses __get_free_pages to allocate a data buffer of size |
f73850a3 | 1003 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
3c98bf34 | 1004 | * much as possible. |
1da177e4 | 1005 | * |
41aa1706 BP |
1006 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
1007 | * failure. | |
1da177e4 | 1008 | */ |
077e3bdb BP |
1009 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, |
1010 | int full, int clear) | |
1da177e4 | 1011 | { |
077e3bdb | 1012 | struct idetape_bh *prev_bh, *bh, *merge_bh; |
a997a435 | 1013 | int pages = tape->pages_per_buffer; |
41aa1706 | 1014 | unsigned int order, b_allocd; |
1da177e4 LT |
1015 | char *b_data = NULL; |
1016 | ||
077e3bdb BP |
1017 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1018 | bh = merge_bh; | |
1da177e4 LT |
1019 | if (bh == NULL) |
1020 | goto abort; | |
41aa1706 BP |
1021 | |
1022 | order = fls(pages) - 1; | |
1023 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 1024 | if (!bh->b_data) |
1da177e4 | 1025 | goto abort; |
41aa1706 BP |
1026 | b_allocd = (1 << order) * PAGE_SIZE; |
1027 | pages &= (order-1); | |
1028 | ||
1da177e4 | 1029 | if (clear) |
41aa1706 BP |
1030 | memset(bh->b_data, 0, b_allocd); |
1031 | bh->b_reqnext = NULL; | |
1032 | bh->b_size = b_allocd; | |
1da177e4 LT |
1033 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1034 | ||
41aa1706 BP |
1035 | while (pages) { |
1036 | order = fls(pages) - 1; | |
1037 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 1038 | if (!b_data) |
1da177e4 | 1039 | goto abort; |
41aa1706 BP |
1040 | b_allocd = (1 << order) * PAGE_SIZE; |
1041 | ||
1da177e4 | 1042 | if (clear) |
41aa1706 BP |
1043 | memset(b_data, 0, b_allocd); |
1044 | ||
1045 | /* newly allocated page frames below buffer header or ...*/ | |
1046 | if (bh->b_data == b_data + b_allocd) { | |
1047 | bh->b_size += b_allocd; | |
1048 | bh->b_data -= b_allocd; | |
1da177e4 | 1049 | if (full) |
41aa1706 | 1050 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1051 | continue; |
1052 | } | |
41aa1706 | 1053 | /* they are above the header */ |
1da177e4 | 1054 | if (b_data == bh->b_data + bh->b_size) { |
41aa1706 | 1055 | bh->b_size += b_allocd; |
1da177e4 | 1056 | if (full) |
41aa1706 | 1057 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1058 | continue; |
1059 | } | |
1060 | prev_bh = bh; | |
5a04cfa9 BP |
1061 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1062 | if (!bh) { | |
41aa1706 | 1063 | free_pages((unsigned long) b_data, order); |
1da177e4 LT |
1064 | goto abort; |
1065 | } | |
1066 | bh->b_reqnext = NULL; | |
1067 | bh->b_data = b_data; | |
41aa1706 | 1068 | bh->b_size = b_allocd; |
1da177e4 LT |
1069 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1070 | prev_bh->b_reqnext = bh; | |
41aa1706 BP |
1071 | |
1072 | pages &= (order-1); | |
1da177e4 | 1073 | } |
41aa1706 | 1074 | |
1da177e4 LT |
1075 | bh->b_size -= tape->excess_bh_size; |
1076 | if (full) | |
1077 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
077e3bdb | 1078 | return merge_bh; |
1da177e4 | 1079 | abort: |
077e3bdb | 1080 | ide_tape_kfree_buffer(tape); |
1da177e4 LT |
1081 | return NULL; |
1082 | } | |
1083 | ||
5a04cfa9 | 1084 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
8646c88f | 1085 | const char __user *buf, int n) |
1da177e4 LT |
1086 | { |
1087 | struct idetape_bh *bh = tape->bh; | |
1088 | int count; | |
dcd96379 | 1089 | int ret = 0; |
1da177e4 LT |
1090 | |
1091 | while (n) { | |
1da177e4 | 1092 | if (bh == NULL) { |
5a04cfa9 BP |
1093 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1094 | __func__); | |
dcd96379 | 1095 | return 1; |
1da177e4 | 1096 | } |
5a04cfa9 BP |
1097 | count = min((unsigned int) |
1098 | (bh->b_size - atomic_read(&bh->b_count)), | |
1099 | (unsigned int)n); | |
1100 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
1101 | count)) | |
dcd96379 | 1102 | ret = 1; |
1da177e4 LT |
1103 | n -= count; |
1104 | atomic_add(count, &bh->b_count); | |
1105 | buf += count; | |
1106 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
1107 | bh = bh->b_reqnext; | |
1108 | if (bh) | |
1109 | atomic_set(&bh->b_count, 0); | |
1110 | } | |
1111 | } | |
1112 | tape->bh = bh; | |
dcd96379 | 1113 | return ret; |
1da177e4 LT |
1114 | } |
1115 | ||
5a04cfa9 | 1116 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
99d74e61 | 1117 | int n) |
1da177e4 LT |
1118 | { |
1119 | struct idetape_bh *bh = tape->bh; | |
1120 | int count; | |
dcd96379 | 1121 | int ret = 0; |
1da177e4 LT |
1122 | |
1123 | while (n) { | |
1da177e4 | 1124 | if (bh == NULL) { |
5a04cfa9 BP |
1125 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1126 | __func__); | |
dcd96379 | 1127 | return 1; |
1da177e4 | 1128 | } |
1da177e4 | 1129 | count = min(tape->b_count, n); |
dcd96379 DW |
1130 | if (copy_to_user(buf, tape->b_data, count)) |
1131 | ret = 1; | |
1da177e4 LT |
1132 | n -= count; |
1133 | tape->b_data += count; | |
1134 | tape->b_count -= count; | |
1135 | buf += count; | |
1136 | if (!tape->b_count) { | |
5a04cfa9 BP |
1137 | bh = bh->b_reqnext; |
1138 | tape->bh = bh; | |
1da177e4 LT |
1139 | if (bh) { |
1140 | tape->b_data = bh->b_data; | |
1141 | tape->b_count = atomic_read(&bh->b_count); | |
1142 | } | |
1143 | } | |
1144 | } | |
dcd96379 | 1145 | return ret; |
1da177e4 LT |
1146 | } |
1147 | ||
077e3bdb | 1148 | static void idetape_init_merge_buffer(idetape_tape_t *tape) |
1da177e4 | 1149 | { |
077e3bdb BP |
1150 | struct idetape_bh *bh = tape->merge_bh; |
1151 | tape->bh = tape->merge_bh; | |
5a04cfa9 | 1152 | |
54abf37e | 1153 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 LT |
1154 | atomic_set(&bh->b_count, 0); |
1155 | else { | |
1156 | tape->b_data = bh->b_data; | |
1157 | tape->b_count = atomic_read(&bh->b_count); | |
1158 | } | |
1159 | } | |
1160 | ||
1da177e4 | 1161 | /* |
3c98bf34 BP |
1162 | * Write a filemark if write_filemark=1. Flush the device buffers without |
1163 | * writing a filemark otherwise. | |
1da177e4 | 1164 | */ |
5a04cfa9 | 1165 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 1166 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 LT |
1167 | { |
1168 | idetape_init_pc(pc); | |
90699ce2 | 1169 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 1170 | pc->c[4] = write_filemark; |
346331f8 | 1171 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1172 | } |
1173 | ||
d236d74c | 1174 | static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1175 | { |
1176 | idetape_init_pc(pc); | |
90699ce2 | 1177 | pc->c[0] = TEST_UNIT_READY; |
1da177e4 LT |
1178 | } |
1179 | ||
1180 | /* | |
3c98bf34 | 1181 | * We add a special packet command request to the tail of the request queue, and |
394a4c21 | 1182 | * wait for it to be serviced. |
1da177e4 | 1183 | */ |
ea1ab3d3 | 1184 | static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
1185 | { |
1186 | struct ide_tape_obj *tape = drive->driver_data; | |
64ea1b4a FT |
1187 | struct request *rq; |
1188 | int error; | |
1da177e4 | 1189 | |
64ea1b4a FT |
1190 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1191 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1192 | rq->cmd[13] = REQ_IDETAPE_PC1; |
64ea1b4a | 1193 | rq->buffer = (char *)pc; |
0014c75b | 1194 | memcpy(rq->cmd, pc->c, 12); |
64ea1b4a FT |
1195 | error = blk_execute_rq(drive->queue, tape->disk, rq, 0); |
1196 | blk_put_request(rq); | |
1197 | return error; | |
1da177e4 LT |
1198 | } |
1199 | ||
d236d74c BP |
1200 | static void idetape_create_load_unload_cmd(ide_drive_t *drive, |
1201 | struct ide_atapi_pc *pc, int cmd) | |
1da177e4 LT |
1202 | { |
1203 | idetape_init_pc(pc); | |
90699ce2 | 1204 | pc->c[0] = START_STOP; |
1da177e4 | 1205 | pc->c[4] = cmd; |
346331f8 | 1206 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1207 | } |
1208 | ||
1209 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) | |
1210 | { | |
1211 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1212 | struct ide_atapi_pc pc; |
1da177e4 LT |
1213 | int load_attempted = 0; |
1214 | ||
3c98bf34 | 1215 | /* Wait for the tape to become ready */ |
f2e3ab52 | 1216 | set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
1da177e4 LT |
1217 | timeout += jiffies; |
1218 | while (time_before(jiffies, timeout)) { | |
1219 | idetape_create_test_unit_ready_cmd(&pc); | |
ea1ab3d3 | 1220 | if (!idetape_queue_pc_tail(drive, &pc)) |
1da177e4 LT |
1221 | return 0; |
1222 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
1223 | || (tape->asc == 0x3A)) { |
1224 | /* no media */ | |
1da177e4 LT |
1225 | if (load_attempted) |
1226 | return -ENOMEDIUM; | |
5a04cfa9 BP |
1227 | idetape_create_load_unload_cmd(drive, &pc, |
1228 | IDETAPE_LU_LOAD_MASK); | |
ea1ab3d3 | 1229 | idetape_queue_pc_tail(drive, &pc); |
1da177e4 LT |
1230 | load_attempted = 1; |
1231 | /* not about to be ready */ | |
1232 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1233 | (tape->ascq == 1 || tape->ascq == 8))) | |
1234 | return -EIO; | |
80ce45fd | 1235 | msleep(100); |
1da177e4 LT |
1236 | } |
1237 | return -EIO; | |
1238 | } | |
1239 | ||
5a04cfa9 | 1240 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 1241 | { |
d236d74c | 1242 | struct ide_atapi_pc pc; |
1da177e4 LT |
1243 | int rc; |
1244 | ||
1245 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
5a04cfa9 BP |
1246 | rc = idetape_queue_pc_tail(drive, &pc); |
1247 | if (rc) | |
1da177e4 LT |
1248 | return rc; |
1249 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1250 | return 0; | |
1251 | } | |
1252 | ||
d236d74c | 1253 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1254 | { |
1255 | idetape_init_pc(pc); | |
90699ce2 | 1256 | pc->c[0] = READ_POSITION; |
d236d74c | 1257 | pc->req_xfer = 20; |
1da177e4 LT |
1258 | } |
1259 | ||
5a04cfa9 | 1260 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
1261 | { |
1262 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1263 | struct ide_atapi_pc pc; |
1da177e4 LT |
1264 | int position; |
1265 | ||
8004a8c9 | 1266 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
1267 | |
1268 | idetape_create_read_position_cmd(&pc); | |
1269 | if (idetape_queue_pc_tail(drive, &pc)) | |
1270 | return -1; | |
54bb2074 | 1271 | position = tape->first_frame; |
1da177e4 LT |
1272 | return position; |
1273 | } | |
1274 | ||
d236d74c BP |
1275 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
1276 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1277 | unsigned int block, u8 partition, int skip) |
1da177e4 LT |
1278 | { |
1279 | idetape_init_pc(pc); | |
90699ce2 | 1280 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 1281 | pc->c[1] = 2; |
860ff5ec | 1282 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 1283 | pc->c[8] = partition; |
346331f8 | 1284 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1285 | } |
1286 | ||
d236d74c BP |
1287 | static int idetape_create_prevent_cmd(ide_drive_t *drive, |
1288 | struct ide_atapi_pc *pc, int prevent) | |
1da177e4 LT |
1289 | { |
1290 | idetape_tape_t *tape = drive->driver_data; | |
1291 | ||
b6422013 BP |
1292 | /* device supports locking according to capabilities page */ |
1293 | if (!(tape->caps[6] & 0x01)) | |
1da177e4 LT |
1294 | return 0; |
1295 | ||
1296 | idetape_init_pc(pc); | |
90699ce2 | 1297 | pc->c[0] = ALLOW_MEDIUM_REMOVAL; |
1da177e4 | 1298 | pc->c[4] = prevent; |
1da177e4 LT |
1299 | return 1; |
1300 | } | |
1301 | ||
ec0fdb01 | 1302 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1303 | { |
1304 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1305 | |
54abf37e | 1306 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 1307 | return; |
1da177e4 | 1308 | |
f2e3ab52 | 1309 | clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); |
01a63aeb | 1310 | tape->merge_bh_size = 0; |
077e3bdb BP |
1311 | if (tape->merge_bh != NULL) { |
1312 | ide_tape_kfree_buffer(tape); | |
1313 | tape->merge_bh = NULL; | |
1da177e4 LT |
1314 | } |
1315 | ||
54abf37e | 1316 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1317 | } |
1318 | ||
1319 | /* | |
3c98bf34 BP |
1320 | * Position the tape to the requested block using the LOCATE packet command. |
1321 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1322 | * all higher level operations, we queue the commands at the tail of the request | |
1323 | * queue and wait for their completion. | |
1da177e4 | 1324 | */ |
5a04cfa9 BP |
1325 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
1326 | u8 partition, int skip) | |
1da177e4 LT |
1327 | { |
1328 | idetape_tape_t *tape = drive->driver_data; | |
1329 | int retval; | |
d236d74c | 1330 | struct ide_atapi_pc pc; |
1da177e4 | 1331 | |
54abf37e | 1332 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 1333 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1334 | idetape_wait_ready(drive, 60 * 5 * HZ); |
1335 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
1336 | retval = idetape_queue_pc_tail(drive, &pc); | |
1337 | if (retval) | |
1338 | return (retval); | |
1339 | ||
1340 | idetape_create_read_position_cmd(&pc); | |
1341 | return (idetape_queue_pc_tail(drive, &pc)); | |
1342 | } | |
1343 | ||
ec0fdb01 | 1344 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 1345 | int restore_position) |
1da177e4 LT |
1346 | { |
1347 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1348 | int seek, position; |
1349 | ||
ec0fdb01 | 1350 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1351 | if (restore_position) { |
1352 | position = idetape_read_position(drive); | |
9798630a | 1353 | seek = position > 0 ? position : 0; |
1da177e4 | 1354 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 1355 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 1356 | " %s\n", tape->name, __func__); |
1da177e4 LT |
1357 | return; |
1358 | } | |
1359 | } | |
1360 | } | |
1361 | ||
1362 | /* | |
3c98bf34 BP |
1363 | * Generate a read/write request for the block device interface and wait for it |
1364 | * to be serviced. | |
1da177e4 | 1365 | */ |
5a04cfa9 BP |
1366 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
1367 | struct idetape_bh *bh) | |
1da177e4 LT |
1368 | { |
1369 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a FT |
1370 | struct request *rq; |
1371 | int ret, errors; | |
1da177e4 | 1372 | |
8004a8c9 BP |
1373 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
1374 | ||
64ea1b4a FT |
1375 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1376 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1377 | rq->cmd[13] = cmd; |
64ea1b4a FT |
1378 | rq->rq_disk = tape->disk; |
1379 | rq->special = (void *)bh; | |
1380 | rq->sector = tape->first_frame; | |
1381 | rq->nr_sectors = blocks; | |
1382 | rq->current_nr_sectors = blocks; | |
1383 | blk_execute_rq(drive->queue, tape->disk, rq, 0); | |
1384 | ||
1385 | errors = rq->errors; | |
1386 | ret = tape->blk_size * (blocks - rq->current_nr_sectors); | |
1387 | blk_put_request(rq); | |
1da177e4 LT |
1388 | |
1389 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1390 | return 0; | |
1391 | ||
077e3bdb BP |
1392 | if (tape->merge_bh) |
1393 | idetape_init_merge_buffer(tape); | |
64ea1b4a | 1394 | if (errors == IDETAPE_ERROR_GENERAL) |
1da177e4 | 1395 | return -EIO; |
64ea1b4a | 1396 | return ret; |
1da177e4 LT |
1397 | } |
1398 | ||
d236d74c | 1399 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1400 | { |
1401 | idetape_init_pc(pc); | |
90699ce2 | 1402 | pc->c[0] = INQUIRY; |
5a04cfa9 | 1403 | pc->c[4] = 254; |
d236d74c | 1404 | pc->req_xfer = 254; |
1da177e4 LT |
1405 | } |
1406 | ||
d236d74c BP |
1407 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
1408 | struct ide_atapi_pc *pc) | |
1da177e4 LT |
1409 | { |
1410 | idetape_init_pc(pc); | |
90699ce2 | 1411 | pc->c[0] = REZERO_UNIT; |
346331f8 | 1412 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1413 | } |
1414 | ||
d236d74c | 1415 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1416 | { |
1417 | idetape_init_pc(pc); | |
90699ce2 | 1418 | pc->c[0] = ERASE; |
1da177e4 | 1419 | pc->c[1] = 1; |
346331f8 | 1420 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1421 | } |
1422 | ||
d236d74c | 1423 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 LT |
1424 | { |
1425 | idetape_init_pc(pc); | |
90699ce2 | 1426 | pc->c[0] = SPACE; |
860ff5ec | 1427 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 1428 | pc->c[1] = cmd; |
346331f8 | 1429 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1430 | } |
1431 | ||
97c566ce | 1432 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 1433 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1434 | { |
1435 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1436 | |
8004a8c9 | 1437 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 1438 | |
0aa4b01e | 1439 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
077e3bdb | 1440 | blocks, tape->merge_bh); |
1da177e4 LT |
1441 | } |
1442 | ||
d9df937a | 1443 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1444 | { |
1445 | idetape_tape_t *tape = drive->driver_data; | |
1446 | int blocks, min; | |
1447 | struct idetape_bh *bh; | |
55a5d291 | 1448 | |
54abf37e | 1449 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 1450 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 1451 | " but we are not writing.\n"); |
1da177e4 LT |
1452 | return; |
1453 | } | |
01a63aeb | 1454 | if (tape->merge_bh_size > tape->buffer_size) { |
1da177e4 | 1455 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
01a63aeb | 1456 | tape->merge_bh_size = tape->buffer_size; |
1da177e4 | 1457 | } |
01a63aeb BP |
1458 | if (tape->merge_bh_size) { |
1459 | blocks = tape->merge_bh_size / tape->blk_size; | |
1460 | if (tape->merge_bh_size % tape->blk_size) { | |
1da177e4 LT |
1461 | unsigned int i; |
1462 | ||
1463 | blocks++; | |
01a63aeb | 1464 | i = tape->blk_size - tape->merge_bh_size % |
54bb2074 | 1465 | tape->blk_size; |
1da177e4 LT |
1466 | bh = tape->bh->b_reqnext; |
1467 | while (bh) { | |
1468 | atomic_set(&bh->b_count, 0); | |
1469 | bh = bh->b_reqnext; | |
1470 | } | |
1471 | bh = tape->bh; | |
1472 | while (i) { | |
1473 | if (bh == NULL) { | |
5a04cfa9 BP |
1474 | printk(KERN_INFO "ide-tape: bug," |
1475 | " bh NULL\n"); | |
1da177e4 LT |
1476 | break; |
1477 | } | |
5a04cfa9 BP |
1478 | min = min(i, (unsigned int)(bh->b_size - |
1479 | atomic_read(&bh->b_count))); | |
1480 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1481 | 0, min); | |
1da177e4 LT |
1482 | atomic_add(min, &bh->b_count); |
1483 | i -= min; | |
1484 | bh = bh->b_reqnext; | |
1485 | } | |
1486 | } | |
1487 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
01a63aeb | 1488 | tape->merge_bh_size = 0; |
1da177e4 | 1489 | } |
077e3bdb BP |
1490 | if (tape->merge_bh != NULL) { |
1491 | ide_tape_kfree_buffer(tape); | |
1492 | tape->merge_bh = NULL; | |
1da177e4 | 1493 | } |
54abf37e | 1494 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1495 | } |
1496 | ||
83042b24 | 1497 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
1498 | { |
1499 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1500 | int bytes_read; |
1da177e4 LT |
1501 | |
1502 | /* Initialize read operation */ | |
54abf37e BP |
1503 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1504 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
d9df937a | 1505 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1506 | idetape_flush_tape_buffers(drive); |
1507 | } | |
077e3bdb | 1508 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1509 | printk(KERN_ERR "ide-tape: merge_bh_size should be" |
5a04cfa9 | 1510 | " 0 now\n"); |
01a63aeb | 1511 | tape->merge_bh_size = 0; |
1da177e4 | 1512 | } |
077e3bdb BP |
1513 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1514 | if (!tape->merge_bh) | |
1da177e4 | 1515 | return -ENOMEM; |
54abf37e | 1516 | tape->chrdev_dir = IDETAPE_DIR_READ; |
1da177e4 LT |
1517 | |
1518 | /* | |
3c98bf34 BP |
1519 | * Issue a read 0 command to ensure that DSC handshake is |
1520 | * switched from completion mode to buffer available mode. | |
1521 | * No point in issuing this if DSC overlap isn't supported, some | |
1522 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1523 | */ |
1524 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1525 | bytes_read = idetape_queue_rw_tail(drive, |
1526 | REQ_IDETAPE_READ, 0, | |
077e3bdb | 1527 | tape->merge_bh); |
1da177e4 | 1528 | if (bytes_read < 0) { |
077e3bdb BP |
1529 | ide_tape_kfree_buffer(tape); |
1530 | tape->merge_bh = NULL; | |
54abf37e | 1531 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1532 | return bytes_read; |
1533 | } | |
1534 | } | |
1535 | } | |
5e69bd95 | 1536 | |
1da177e4 LT |
1537 | return 0; |
1538 | } | |
1539 | ||
5bd50dc6 | 1540 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1541 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1542 | { |
1543 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1544 | |
8004a8c9 | 1545 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1546 | |
3c98bf34 | 1547 | /* If we are at a filemark, return a read length of 0 */ |
f2e3ab52 | 1548 | if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 LT |
1549 | return 0; |
1550 | ||
83042b24 | 1551 | idetape_init_read(drive); |
5e69bd95 | 1552 | |
5e69bd95 | 1553 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
077e3bdb | 1554 | tape->merge_bh); |
1da177e4 LT |
1555 | } |
1556 | ||
5a04cfa9 | 1557 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1558 | { |
1559 | idetape_tape_t *tape = drive->driver_data; | |
1560 | struct idetape_bh *bh; | |
1561 | int blocks; | |
3c98bf34 | 1562 | |
1da177e4 LT |
1563 | while (bcount) { |
1564 | unsigned int count; | |
1565 | ||
077e3bdb | 1566 | bh = tape->merge_bh; |
f73850a3 | 1567 | count = min(tape->buffer_size, bcount); |
1da177e4 | 1568 | bcount -= count; |
54bb2074 | 1569 | blocks = count / tape->blk_size; |
1da177e4 | 1570 | while (count) { |
5a04cfa9 BP |
1571 | atomic_set(&bh->b_count, |
1572 | min(count, (unsigned int)bh->b_size)); | |
1da177e4 LT |
1573 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
1574 | count -= atomic_read(&bh->b_count); | |
1575 | bh = bh->b_reqnext; | |
1576 | } | |
5a04cfa9 | 1577 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
077e3bdb | 1578 | tape->merge_bh); |
1da177e4 LT |
1579 | } |
1580 | } | |
1581 | ||
1da177e4 | 1582 | /* |
3c98bf34 BP |
1583 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1584 | * currently support only one partition. | |
1585 | */ | |
5a04cfa9 | 1586 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 LT |
1587 | { |
1588 | int retval; | |
d236d74c | 1589 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1590 | idetape_tape_t *tape; |
1591 | tape = drive->driver_data; | |
1592 | ||
1593 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1594 | ||
1da177e4 LT |
1595 | idetape_create_rewind_cmd(drive, &pc); |
1596 | retval = idetape_queue_pc_tail(drive, &pc); | |
1597 | if (retval) | |
1598 | return retval; | |
1599 | ||
1600 | idetape_create_read_position_cmd(&pc); | |
1601 | retval = idetape_queue_pc_tail(drive, &pc); | |
1602 | if (retval) | |
1603 | return retval; | |
1604 | return 0; | |
1605 | } | |
1606 | ||
3c98bf34 | 1607 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1608 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1609 | unsigned long arg) | |
1da177e4 LT |
1610 | { |
1611 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1612 | void __user *argp = (void __user *)arg; |
1613 | ||
d59823fa BP |
1614 | struct idetape_config { |
1615 | int dsc_rw_frequency; | |
1616 | int dsc_media_access_frequency; | |
1617 | int nr_stages; | |
1618 | } config; | |
1619 | ||
8004a8c9 BP |
1620 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1621 | ||
1da177e4 | 1622 | switch (cmd) { |
5a04cfa9 BP |
1623 | case 0x0340: |
1624 | if (copy_from_user(&config, argp, sizeof(config))) | |
1625 | return -EFAULT; | |
1626 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1627 | break; |
1628 | case 0x0350: | |
1629 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1630 | config.nr_stages = 1; |
5a04cfa9 BP |
1631 | if (copy_to_user(argp, &config, sizeof(config))) |
1632 | return -EFAULT; | |
1633 | break; | |
1634 | default: | |
1635 | return -EIO; | |
1da177e4 LT |
1636 | } |
1637 | return 0; | |
1638 | } | |
1639 | ||
5a04cfa9 BP |
1640 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1641 | int mt_count) | |
1da177e4 LT |
1642 | { |
1643 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1644 | struct ide_atapi_pc pc; |
5a04cfa9 | 1645 | int retval, count = 0; |
b6422013 | 1646 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1647 | |
1648 | if (mt_count == 0) | |
1649 | return 0; | |
1650 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1651 | if (!sprev) |
1da177e4 | 1652 | return -EIO; |
5a04cfa9 | 1653 | mt_count = -mt_count; |
1da177e4 LT |
1654 | } |
1655 | ||
54abf37e | 1656 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
01a63aeb | 1657 | tape->merge_bh_size = 0; |
f2e3ab52 | 1658 | if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 | 1659 | ++count; |
ec0fdb01 | 1660 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1661 | } |
1662 | ||
1da177e4 | 1663 | switch (mt_op) { |
5a04cfa9 BP |
1664 | case MTFSF: |
1665 | case MTBSF: | |
1666 | idetape_create_space_cmd(&pc, mt_count - count, | |
1667 | IDETAPE_SPACE_OVER_FILEMARK); | |
1668 | return idetape_queue_pc_tail(drive, &pc); | |
1669 | case MTFSFM: | |
1670 | case MTBSFM: | |
1671 | if (!sprev) | |
1672 | return -EIO; | |
1673 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1674 | mt_count - count); | |
1675 | if (retval) | |
1676 | return retval; | |
1677 | count = (MTBSFM == mt_op ? 1 : -1); | |
1678 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1679 | default: | |
1680 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1681 | mt_op); | |
1682 | return -EIO; | |
1da177e4 LT |
1683 | } |
1684 | } | |
1685 | ||
1da177e4 | 1686 | /* |
3c98bf34 | 1687 | * Our character device read / write functions. |
1da177e4 | 1688 | * |
3c98bf34 BP |
1689 | * The tape is optimized to maximize throughput when it is transferring an |
1690 | * integral number of the "continuous transfer limit", which is a parameter of | |
1691 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1692 | * |
3c98bf34 BP |
1693 | * As of version 1.3 of the driver, the character device provides an abstract |
1694 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1695 | * same backup/restore procedure is supported. The driver will internally | |
1696 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1697 | * between the user's block size to the recommended size will only result in a | |
1698 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1699 | * This is not applicable to Onstream. | |
1da177e4 | 1700 | */ |
5a04cfa9 BP |
1701 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1702 | size_t count, loff_t *ppos) | |
1da177e4 LT |
1703 | { |
1704 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1705 | ide_drive_t *drive = tape->drive; | |
5a04cfa9 | 1706 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 1707 | ssize_t ret = 0; |
b6422013 | 1708 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 1709 | |
8004a8c9 | 1710 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1711 | |
54abf37e | 1712 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
f2e3ab52 | 1713 | if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) |
54bb2074 BP |
1714 | if (count > tape->blk_size && |
1715 | (count % tape->blk_size) == 0) | |
1716 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1717 | } |
83042b24 | 1718 | rc = idetape_init_read(drive); |
8d06bfad | 1719 | if (rc < 0) |
1da177e4 LT |
1720 | return rc; |
1721 | if (count == 0) | |
1722 | return (0); | |
01a63aeb BP |
1723 | if (tape->merge_bh_size) { |
1724 | actually_read = min((unsigned int)(tape->merge_bh_size), | |
5a04cfa9 | 1725 | (unsigned int)count); |
99d74e61 | 1726 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
dcd96379 | 1727 | ret = -EFAULT; |
1da177e4 | 1728 | buf += actually_read; |
01a63aeb | 1729 | tape->merge_bh_size -= actually_read; |
1da177e4 LT |
1730 | count -= actually_read; |
1731 | } | |
f73850a3 | 1732 | while (count >= tape->buffer_size) { |
b6422013 | 1733 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1734 | if (bytes_read <= 0) |
1735 | goto finish; | |
99d74e61 | 1736 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
dcd96379 | 1737 | ret = -EFAULT; |
1da177e4 LT |
1738 | buf += bytes_read; |
1739 | count -= bytes_read; | |
1740 | actually_read += bytes_read; | |
1741 | } | |
1742 | if (count) { | |
b6422013 | 1743 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1744 | if (bytes_read <= 0) |
1745 | goto finish; | |
1746 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
99d74e61 | 1747 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
dcd96379 | 1748 | ret = -EFAULT; |
1da177e4 | 1749 | actually_read += temp; |
01a63aeb | 1750 | tape->merge_bh_size = bytes_read-temp; |
1da177e4 LT |
1751 | } |
1752 | finish: | |
f2e3ab52 | 1753 | if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { |
8004a8c9 BP |
1754 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1755 | ||
1da177e4 LT |
1756 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1757 | return 0; | |
1758 | } | |
dcd96379 | 1759 | |
5a04cfa9 | 1760 | return ret ? ret : actually_read; |
1da177e4 LT |
1761 | } |
1762 | ||
5a04cfa9 | 1763 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1764 | size_t count, loff_t *ppos) |
1765 | { | |
1766 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1767 | ide_drive_t *drive = tape->drive; | |
dcd96379 DW |
1768 | ssize_t actually_written = 0; |
1769 | ssize_t ret = 0; | |
b6422013 | 1770 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
1771 | |
1772 | /* The drive is write protected. */ | |
1773 | if (tape->write_prot) | |
1774 | return -EACCES; | |
1775 | ||
8004a8c9 | 1776 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1777 | |
1778 | /* Initialize write operation */ | |
54abf37e BP |
1779 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
1780 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1781 | ide_tape_discard_merge_buffer(drive, 1); |
077e3bdb | 1782 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1783 | printk(KERN_ERR "ide-tape: merge_bh_size " |
1da177e4 | 1784 | "should be 0 now\n"); |
01a63aeb | 1785 | tape->merge_bh_size = 0; |
1da177e4 | 1786 | } |
077e3bdb BP |
1787 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1788 | if (!tape->merge_bh) | |
1da177e4 | 1789 | return -ENOMEM; |
54abf37e | 1790 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
077e3bdb | 1791 | idetape_init_merge_buffer(tape); |
1da177e4 LT |
1792 | |
1793 | /* | |
3c98bf34 BP |
1794 | * Issue a write 0 command to ensure that DSC handshake is |
1795 | * switched from completion mode to buffer available mode. No | |
1796 | * point in issuing this if DSC overlap isn't supported, some | |
1797 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1798 | */ |
1799 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1800 | ssize_t retval = idetape_queue_rw_tail(drive, |
1801 | REQ_IDETAPE_WRITE, 0, | |
077e3bdb | 1802 | tape->merge_bh); |
1da177e4 | 1803 | if (retval < 0) { |
077e3bdb BP |
1804 | ide_tape_kfree_buffer(tape); |
1805 | tape->merge_bh = NULL; | |
54abf37e | 1806 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1807 | return retval; |
1808 | } | |
1809 | } | |
1810 | } | |
1811 | if (count == 0) | |
1812 | return (0); | |
01a63aeb BP |
1813 | if (tape->merge_bh_size) { |
1814 | if (tape->merge_bh_size >= tape->buffer_size) { | |
5a04cfa9 | 1815 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
01a63aeb | 1816 | tape->merge_bh_size = 0; |
1da177e4 | 1817 | } |
5a04cfa9 | 1818 | actually_written = min((unsigned int) |
01a63aeb | 1819 | (tape->buffer_size - tape->merge_bh_size), |
5a04cfa9 | 1820 | (unsigned int)count); |
8646c88f | 1821 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
dcd96379 | 1822 | ret = -EFAULT; |
1da177e4 | 1823 | buf += actually_written; |
01a63aeb | 1824 | tape->merge_bh_size += actually_written; |
1da177e4 LT |
1825 | count -= actually_written; |
1826 | ||
01a63aeb | 1827 | if (tape->merge_bh_size == tape->buffer_size) { |
dcd96379 | 1828 | ssize_t retval; |
01a63aeb | 1829 | tape->merge_bh_size = 0; |
b6422013 | 1830 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
1831 | if (retval <= 0) |
1832 | return (retval); | |
1833 | } | |
1834 | } | |
f73850a3 | 1835 | while (count >= tape->buffer_size) { |
dcd96379 | 1836 | ssize_t retval; |
f73850a3 | 1837 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
dcd96379 | 1838 | ret = -EFAULT; |
f73850a3 BP |
1839 | buf += tape->buffer_size; |
1840 | count -= tape->buffer_size; | |
b6422013 | 1841 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 1842 | actually_written += tape->buffer_size; |
1da177e4 LT |
1843 | if (retval <= 0) |
1844 | return (retval); | |
1845 | } | |
1846 | if (count) { | |
1847 | actually_written += count; | |
8646c88f | 1848 | if (idetape_copy_stage_from_user(tape, buf, count)) |
dcd96379 | 1849 | ret = -EFAULT; |
01a63aeb | 1850 | tape->merge_bh_size += count; |
1da177e4 | 1851 | } |
5a04cfa9 | 1852 | return ret ? ret : actually_written; |
1da177e4 LT |
1853 | } |
1854 | ||
5a04cfa9 | 1855 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1856 | { |
d236d74c | 1857 | struct ide_atapi_pc pc; |
1da177e4 LT |
1858 | |
1859 | /* Write a filemark */ | |
1860 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
1861 | if (idetape_queue_pc_tail(drive, &pc)) { | |
1862 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); | |
1863 | return -EIO; | |
1864 | } | |
1865 | return 0; | |
1866 | } | |
1867 | ||
1868 | /* | |
d99c9da2 BP |
1869 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1870 | * requested. | |
1da177e4 | 1871 | * |
d99c9da2 BP |
1872 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1873 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1874 | * usually not supported. |
1da177e4 | 1875 | * |
d99c9da2 | 1876 | * The following commands are currently not supported: |
1da177e4 | 1877 | * |
d99c9da2 BP |
1878 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1879 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1880 | */ |
d99c9da2 | 1881 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1882 | { |
1883 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1884 | struct ide_atapi_pc pc; |
5a04cfa9 | 1885 | int i, retval; |
1da177e4 | 1886 | |
8004a8c9 BP |
1887 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
1888 | mt_op, mt_count); | |
5a04cfa9 | 1889 | |
1da177e4 | 1890 | switch (mt_op) { |
5a04cfa9 BP |
1891 | case MTFSF: |
1892 | case MTFSFM: | |
1893 | case MTBSF: | |
1894 | case MTBSFM: | |
1895 | if (!mt_count) | |
1896 | return 0; | |
1897 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1898 | default: | |
1899 | break; | |
1da177e4 | 1900 | } |
5a04cfa9 | 1901 | |
1da177e4 | 1902 | switch (mt_op) { |
5a04cfa9 BP |
1903 | case MTWEOF: |
1904 | if (tape->write_prot) | |
1905 | return -EACCES; | |
ec0fdb01 | 1906 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1907 | for (i = 0; i < mt_count; i++) { |
1908 | retval = idetape_write_filemark(drive); | |
1909 | if (retval) | |
1910 | return retval; | |
1911 | } | |
1912 | return 0; | |
1913 | case MTREW: | |
ec0fdb01 | 1914 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1915 | if (idetape_rewind_tape(drive)) |
1916 | return -EIO; | |
1917 | return 0; | |
1918 | case MTLOAD: | |
ec0fdb01 | 1919 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1920 | idetape_create_load_unload_cmd(drive, &pc, |
1921 | IDETAPE_LU_LOAD_MASK); | |
1922 | return idetape_queue_pc_tail(drive, &pc); | |
1923 | case MTUNLOAD: | |
1924 | case MTOFFL: | |
1925 | /* | |
1926 | * If door is locked, attempt to unlock before | |
1927 | * attempting to eject. | |
1928 | */ | |
1929 | if (tape->door_locked) { | |
1930 | if (idetape_create_prevent_cmd(drive, &pc, 0)) | |
1931 | if (!idetape_queue_pc_tail(drive, &pc)) | |
1932 | tape->door_locked = DOOR_UNLOCKED; | |
1933 | } | |
ec0fdb01 | 1934 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1935 | idetape_create_load_unload_cmd(drive, &pc, |
1936 | !IDETAPE_LU_LOAD_MASK); | |
1937 | retval = idetape_queue_pc_tail(drive, &pc); | |
1938 | if (!retval) | |
f2e3ab52 | 1939 | clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
5a04cfa9 BP |
1940 | return retval; |
1941 | case MTNOP: | |
ec0fdb01 | 1942 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1943 | return idetape_flush_tape_buffers(drive); |
1944 | case MTRETEN: | |
ec0fdb01 | 1945 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1946 | idetape_create_load_unload_cmd(drive, &pc, |
1947 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); | |
1948 | return idetape_queue_pc_tail(drive, &pc); | |
1949 | case MTEOM: | |
1950 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
1951 | return idetape_queue_pc_tail(drive, &pc); | |
1952 | case MTERASE: | |
1953 | (void)idetape_rewind_tape(drive); | |
1954 | idetape_create_erase_cmd(&pc); | |
1955 | return idetape_queue_pc_tail(drive, &pc); | |
1956 | case MTSETBLK: | |
1957 | if (mt_count) { | |
1958 | if (mt_count < tape->blk_size || | |
1959 | mt_count % tape->blk_size) | |
1da177e4 | 1960 | return -EIO; |
5a04cfa9 | 1961 | tape->user_bs_factor = mt_count / tape->blk_size; |
f2e3ab52 | 1962 | clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 | 1963 | } else |
f2e3ab52 | 1964 | set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 BP |
1965 | return 0; |
1966 | case MTSEEK: | |
ec0fdb01 | 1967 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1968 | return idetape_position_tape(drive, |
1969 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1970 | case MTSETPART: | |
ec0fdb01 | 1971 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1972 | return idetape_position_tape(drive, 0, mt_count, 0); |
1973 | case MTFSR: | |
1974 | case MTBSR: | |
1975 | case MTLOCK: | |
1976 | if (!idetape_create_prevent_cmd(drive, &pc, 1)) | |
1da177e4 | 1977 | return 0; |
5a04cfa9 BP |
1978 | retval = idetape_queue_pc_tail(drive, &pc); |
1979 | if (retval) | |
1da177e4 | 1980 | return retval; |
5a04cfa9 BP |
1981 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1982 | return 0; | |
1983 | case MTUNLOCK: | |
1984 | if (!idetape_create_prevent_cmd(drive, &pc, 0)) | |
1da177e4 | 1985 | return 0; |
5a04cfa9 BP |
1986 | retval = idetape_queue_pc_tail(drive, &pc); |
1987 | if (retval) | |
1988 | return retval; | |
1989 | tape->door_locked = DOOR_UNLOCKED; | |
1990 | return 0; | |
1991 | default: | |
1992 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1993 | mt_op); | |
1994 | return -EIO; | |
1da177e4 LT |
1995 | } |
1996 | } | |
1997 | ||
1998 | /* | |
d99c9da2 BP |
1999 | * Our character device ioctls. General mtio.h magnetic io commands are |
2000 | * supported here, and not in the corresponding block interface. Our own | |
2001 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 2002 | */ |
d99c9da2 BP |
2003 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
2004 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
2005 | { |
2006 | struct ide_tape_obj *tape = ide_tape_f(file); | |
2007 | ide_drive_t *drive = tape->drive; | |
2008 | struct mtop mtop; | |
2009 | struct mtget mtget; | |
2010 | struct mtpos mtpos; | |
54bb2074 | 2011 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
2012 | void __user *argp = (void __user *)arg; |
2013 | ||
8004a8c9 | 2014 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 2015 | |
54abf37e | 2016 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 2017 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
2018 | idetape_flush_tape_buffers(drive); |
2019 | } | |
2020 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
01a63aeb | 2021 | block_offset = tape->merge_bh_size / |
54bb2074 | 2022 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
2023 | position = idetape_read_position(drive); |
2024 | if (position < 0) | |
1da177e4 LT |
2025 | return -EIO; |
2026 | } | |
2027 | switch (cmd) { | |
5a04cfa9 BP |
2028 | case MTIOCTOP: |
2029 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
2030 | return -EFAULT; | |
2031 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
2032 | case MTIOCGET: | |
2033 | memset(&mtget, 0, sizeof(struct mtget)); | |
2034 | mtget.mt_type = MT_ISSCSI2; | |
2035 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2036 | mtget.mt_dsreg = | |
2037 | ((tape->blk_size * tape->user_bs_factor) | |
2038 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
2039 | ||
2040 | if (tape->drv_write_prot) | |
2041 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
2042 | ||
2043 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
2044 | return -EFAULT; | |
2045 | return 0; | |
2046 | case MTIOCPOS: | |
2047 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2048 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
2049 | return -EFAULT; | |
2050 | return 0; | |
2051 | default: | |
2052 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 2053 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 2054 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
2055 | } |
2056 | } | |
2057 | ||
3cffb9ce BP |
2058 | /* |
2059 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
2060 | * block size with the reported value. | |
2061 | */ | |
2062 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
2063 | { | |
2064 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2065 | struct ide_atapi_pc pc; |
3cffb9ce BP |
2066 | |
2067 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2068 | if (idetape_queue_pc_tail(drive, &pc)) { | |
2069 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); | |
54bb2074 | 2070 | if (tape->blk_size == 0) { |
3cffb9ce BP |
2071 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
2072 | "block size, assuming 32k\n"); | |
54bb2074 | 2073 | tape->blk_size = 32768; |
3cffb9ce BP |
2074 | } |
2075 | return; | |
2076 | } | |
d236d74c BP |
2077 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
2078 | (pc.buf[4 + 6] << 8) + | |
2079 | pc.buf[4 + 7]; | |
2080 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 2081 | } |
1da177e4 | 2082 | |
5a04cfa9 | 2083 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
2084 | { |
2085 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
2086 | ide_drive_t *drive; | |
2087 | idetape_tape_t *tape; | |
d236d74c | 2088 | struct ide_atapi_pc pc; |
1da177e4 LT |
2089 | int retval; |
2090 | ||
8004a8c9 BP |
2091 | if (i >= MAX_HWIFS * MAX_DRIVES) |
2092 | return -ENXIO; | |
2093 | ||
04f4ac9d | 2094 | lock_kernel(); |
8004a8c9 | 2095 | tape = ide_tape_chrdev_get(i); |
04f4ac9d JC |
2096 | if (!tape) { |
2097 | unlock_kernel(); | |
8004a8c9 | 2098 | return -ENXIO; |
04f4ac9d | 2099 | } |
8004a8c9 BP |
2100 | |
2101 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
2102 | ||
1da177e4 LT |
2103 | /* |
2104 | * We really want to do nonseekable_open(inode, filp); here, but some | |
2105 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
2106 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
2107 | */ | |
2108 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
2109 | ||
1da177e4 LT |
2110 | drive = tape->drive; |
2111 | ||
2112 | filp->private_data = tape; | |
2113 | ||
f2e3ab52 | 2114 | if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { |
1da177e4 LT |
2115 | retval = -EBUSY; |
2116 | goto out_put_tape; | |
2117 | } | |
2118 | ||
2119 | retval = idetape_wait_ready(drive, 60 * HZ); | |
2120 | if (retval) { | |
f2e3ab52 | 2121 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2122 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
2123 | goto out_put_tape; | |
2124 | } | |
2125 | ||
2126 | idetape_read_position(drive); | |
f2e3ab52 | 2127 | if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) |
1da177e4 LT |
2128 | (void)idetape_rewind_tape(drive); |
2129 | ||
1da177e4 | 2130 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 2131 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
2132 | |
2133 | /* Set write protect flag if device is opened as read-only. */ | |
2134 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
2135 | tape->write_prot = 1; | |
2136 | else | |
2137 | tape->write_prot = tape->drv_write_prot; | |
2138 | ||
2139 | /* Make sure drive isn't write protected if user wants to write. */ | |
2140 | if (tape->write_prot) { | |
2141 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
2142 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
f2e3ab52 | 2143 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2144 | retval = -EROFS; |
2145 | goto out_put_tape; | |
2146 | } | |
2147 | } | |
2148 | ||
3c98bf34 | 2149 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 2150 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 LT |
2151 | if (idetape_create_prevent_cmd(drive, &pc, 1)) { |
2152 | if (!idetape_queue_pc_tail(drive, &pc)) { | |
2153 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) | |
2154 | tape->door_locked = DOOR_LOCKED; | |
2155 | } | |
2156 | } | |
2157 | } | |
04f4ac9d | 2158 | unlock_kernel(); |
1da177e4 LT |
2159 | return 0; |
2160 | ||
2161 | out_put_tape: | |
2162 | ide_tape_put(tape); | |
04f4ac9d | 2163 | unlock_kernel(); |
1da177e4 LT |
2164 | return retval; |
2165 | } | |
2166 | ||
5a04cfa9 | 2167 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
2168 | { |
2169 | idetape_tape_t *tape = drive->driver_data; | |
2170 | ||
d9df937a | 2171 | ide_tape_flush_merge_buffer(drive); |
077e3bdb BP |
2172 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); |
2173 | if (tape->merge_bh != NULL) { | |
54bb2074 BP |
2174 | idetape_pad_zeros(drive, tape->blk_size * |
2175 | (tape->user_bs_factor - 1)); | |
077e3bdb BP |
2176 | ide_tape_kfree_buffer(tape); |
2177 | tape->merge_bh = NULL; | |
1da177e4 LT |
2178 | } |
2179 | idetape_write_filemark(drive); | |
2180 | idetape_flush_tape_buffers(drive); | |
2181 | idetape_flush_tape_buffers(drive); | |
2182 | } | |
2183 | ||
5a04cfa9 | 2184 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 LT |
2185 | { |
2186 | struct ide_tape_obj *tape = ide_tape_f(filp); | |
2187 | ide_drive_t *drive = tape->drive; | |
d236d74c | 2188 | struct ide_atapi_pc pc; |
1da177e4 LT |
2189 | unsigned int minor = iminor(inode); |
2190 | ||
2191 | lock_kernel(); | |
2192 | tape = drive->driver_data; | |
8004a8c9 BP |
2193 | |
2194 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 2195 | |
54abf37e | 2196 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 2197 | idetape_write_release(drive, minor); |
54abf37e | 2198 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 2199 | if (minor < 128) |
ec0fdb01 | 2200 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 2201 | } |
f64eee7b | 2202 | |
f2e3ab52 | 2203 | if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) |
1da177e4 | 2204 | (void) idetape_rewind_tape(drive); |
54abf37e | 2205 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 LT |
2206 | if (tape->door_locked == DOOR_LOCKED) { |
2207 | if (idetape_create_prevent_cmd(drive, &pc, 0)) { | |
2208 | if (!idetape_queue_pc_tail(drive, &pc)) | |
2209 | tape->door_locked = DOOR_UNLOCKED; | |
2210 | } | |
2211 | } | |
2212 | } | |
f2e3ab52 | 2213 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2214 | ide_tape_put(tape); |
2215 | unlock_kernel(); | |
2216 | return 0; | |
2217 | } | |
2218 | ||
6d29c8f0 | 2219 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 2220 | { |
1da177e4 | 2221 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 2222 | struct ide_atapi_pc pc; |
801bd32e | 2223 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 2224 | |
1da177e4 LT |
2225 | idetape_create_inquiry_cmd(&pc); |
2226 | if (idetape_queue_pc_tail(drive, &pc)) { | |
6d29c8f0 BP |
2227 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
2228 | tape->name); | |
1da177e4 LT |
2229 | return; |
2230 | } | |
d236d74c BP |
2231 | memcpy(vendor_id, &pc.buf[8], 8); |
2232 | memcpy(product_id, &pc.buf[16], 16); | |
2233 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 | 2234 | |
801bd32e BP |
2235 | ide_fixstring(vendor_id, 8, 0); |
2236 | ide_fixstring(product_id, 16, 0); | |
2237 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 2238 | |
801bd32e | 2239 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 2240 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
2241 | } |
2242 | ||
2243 | /* | |
b6422013 BP |
2244 | * Ask the tape about its various parameters. In particular, we will adjust our |
2245 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 2246 | */ |
5a04cfa9 | 2247 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
2248 | { |
2249 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2250 | struct ide_atapi_pc pc; |
b6422013 BP |
2251 | u8 *caps; |
2252 | u8 speed, max_speed; | |
47314fa4 | 2253 | |
1da177e4 LT |
2254 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2255 | if (idetape_queue_pc_tail(drive, &pc)) { | |
b6422013 BP |
2256 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
2257 | " some default values\n"); | |
54bb2074 | 2258 | tape->blk_size = 512; |
b6422013 BP |
2259 | put_unaligned(52, (u16 *)&tape->caps[12]); |
2260 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2261 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
2262 | return; |
2263 | } | |
d236d74c | 2264 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
2265 | |
2266 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
2267 | speed = be16_to_cpup((__be16 *)&caps[14]); |
2268 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 2269 | |
cd740ab0 HH |
2270 | *(u16 *)&caps[8] = max_speed; |
2271 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
2272 | *(u16 *)&caps[14] = speed; | |
2273 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 2274 | |
b6422013 BP |
2275 | if (!speed) { |
2276 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2277 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2278 | *(u16 *)&caps[14] = 650; |
1da177e4 | 2279 | } |
b6422013 BP |
2280 | if (!max_speed) { |
2281 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2282 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2283 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
2284 | } |
2285 | ||
b6422013 BP |
2286 | memcpy(&tape->caps, caps, 20); |
2287 | if (caps[7] & 0x02) | |
54bb2074 | 2288 | tape->blk_size = 512; |
b6422013 | 2289 | else if (caps[7] & 0x04) |
54bb2074 | 2290 | tape->blk_size = 1024; |
1da177e4 LT |
2291 | } |
2292 | ||
7662d046 | 2293 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
2294 | #define ide_tape_devset_get(name, field) \ |
2295 | static int get_##name(ide_drive_t *drive) \ | |
2296 | { \ | |
2297 | idetape_tape_t *tape = drive->driver_data; \ | |
2298 | return tape->field; \ | |
2299 | } | |
2300 | ||
2301 | #define ide_tape_devset_set(name, field) \ | |
2302 | static int set_##name(ide_drive_t *drive, int arg) \ | |
2303 | { \ | |
2304 | idetape_tape_t *tape = drive->driver_data; \ | |
2305 | tape->field = arg; \ | |
2306 | return 0; \ | |
2307 | } | |
2308 | ||
2309 | #define ide_tape_devset_rw(_name, _min, _max, _field, _mulf, _divf) \ | |
2310 | ide_tape_devset_get(_name, _field) \ | |
2311 | ide_tape_devset_set(_name, _field) \ | |
2312 | __IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name, _mulf, _divf) | |
2313 | ||
2314 | #define ide_tape_devset_r(_name, _min, _max, _field, _mulf, _divf) \ | |
2315 | ide_tape_devset_get(_name, _field) \ | |
2316 | __IDE_DEVSET(_name, S_READ, _min, _max, get_##_name, NULL, _mulf, _divf) | |
2317 | ||
2318 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
2319 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
2320 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
2321 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
2322 | ||
2323 | ide_devset_rw(dsc_overlap, 0, 1, dsc_overlap); | |
2324 | ||
2325 | ide_tape_devset_rw(debug_mask, 0, 0xffff, debug_mask, NULL, NULL); | |
2326 | ide_tape_devset_rw(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
2327 | best_dsc_rw_freq, mulf_tdsc, divf_tdsc); | |
2328 | ||
2329 | ide_tape_devset_r(avg_speed, 0, 0xffff, avg_speed, NULL, NULL); | |
2330 | ide_tape_devset_r(speed, 0, 0xffff, caps[14], NULL, NULL); | |
2331 | ide_tape_devset_r(buffer, 0, 0xffff, caps[16], NULL, divf_buffer); | |
2332 | ide_tape_devset_r(buffer_size, 0, 0xffff, buffer_size, NULL, divf_buffer_size); | |
2333 | ||
2334 | static const struct ide_devset *idetape_settings[] = { | |
2335 | &ide_devset_avg_speed, | |
2336 | &ide_devset_buffer, | |
2337 | &ide_devset_buffer_size, | |
2338 | &ide_devset_debug_mask, | |
2339 | &ide_devset_dsc_overlap, | |
2340 | &ide_devset_speed, | |
2341 | &ide_devset_tdsc, | |
2342 | NULL | |
2343 | }; | |
7662d046 | 2344 | #endif |
1da177e4 LT |
2345 | |
2346 | /* | |
3c98bf34 | 2347 | * The function below is called to: |
1da177e4 | 2348 | * |
3c98bf34 BP |
2349 | * 1. Initialize our various state variables. |
2350 | * 2. Ask the tape for its capabilities. | |
2351 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2352 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 2353 | * |
3c98bf34 BP |
2354 | * Note that at this point ide.c already assigned us an irq, so that we can |
2355 | * queue requests here and wait for their completion. | |
1da177e4 | 2356 | */ |
5a04cfa9 | 2357 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 2358 | { |
83042b24 | 2359 | unsigned long t; |
1da177e4 | 2360 | int speed; |
f73850a3 | 2361 | int buffer_size; |
71071b8e | 2362 | u8 gcw[2]; |
b6422013 | 2363 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 2364 | |
776bb027 BP |
2365 | drive->pc_callback = ide_tape_callback; |
2366 | ||
54bb2074 | 2367 | spin_lock_init(&tape->lock); |
1da177e4 | 2368 | drive->dsc_overlap = 1; |
4166c199 BZ |
2369 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
2370 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2371 | tape->name); | |
2372 | drive->dsc_overlap = 0; | |
1da177e4 | 2373 | } |
1da177e4 | 2374 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 2375 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
1da177e4 LT |
2376 | drive->dsc_overlap = 0; |
2377 | tape->minor = minor; | |
2378 | tape->name[0] = 'h'; | |
2379 | tape->name[1] = 't'; | |
2380 | tape->name[2] = '0' + minor; | |
54abf37e | 2381 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
4dde4492 BZ |
2382 | |
2383 | *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG]; | |
71071b8e BP |
2384 | |
2385 | /* Command packet DRQ type */ | |
2386 | if (((gcw[0] & 0x60) >> 5) == 1) | |
f2e3ab52 | 2387 | set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags); |
1da177e4 | 2388 | |
1da177e4 LT |
2389 | idetape_get_inquiry_results(drive); |
2390 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 2391 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 2392 | tape->user_bs_factor = 1; |
f73850a3 BP |
2393 | tape->buffer_size = *ctl * tape->blk_size; |
2394 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 2395 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 2396 | *ctl /= 2; |
f73850a3 | 2397 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 2398 | } |
f73850a3 | 2399 | buffer_size = tape->buffer_size; |
a997a435 | 2400 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
f73850a3 | 2401 | if (buffer_size % PAGE_SIZE) { |
a997a435 | 2402 | tape->pages_per_buffer++; |
f73850a3 | 2403 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
1da177e4 LT |
2404 | } |
2405 | ||
83042b24 | 2406 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 2407 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 2408 | |
f73850a3 | 2409 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
2410 | |
2411 | /* | |
3c98bf34 BP |
2412 | * Ensure that the number we got makes sense; limit it within |
2413 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 2414 | */ |
a792bd5a HH |
2415 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
2416 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 2417 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 2418 | "%lums tDSC%s\n", |
b6422013 | 2419 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
2420 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
2421 | tape->buffer_size / 1024, | |
54bb2074 | 2422 | tape->best_dsc_rw_freq * 1000 / HZ, |
1da177e4 LT |
2423 | drive->using_dma ? ", DMA":""); |
2424 | ||
1e874f44 | 2425 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
2426 | } |
2427 | ||
4031bbe4 | 2428 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
2429 | { |
2430 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 2431 | |
7662d046 | 2432 | ide_proc_unregister_driver(drive, tape->driver); |
1da177e4 LT |
2433 | |
2434 | ide_unregister_region(tape->disk); | |
2435 | ||
2436 | ide_tape_put(tape); | |
1da177e4 LT |
2437 | } |
2438 | ||
2439 | static void ide_tape_release(struct kref *kref) | |
2440 | { | |
2441 | struct ide_tape_obj *tape = to_ide_tape(kref); | |
2442 | ide_drive_t *drive = tape->drive; | |
2443 | struct gendisk *g = tape->disk; | |
2444 | ||
01a63aeb | 2445 | BUG_ON(tape->merge_bh_size); |
8604affd | 2446 | |
1da177e4 LT |
2447 | drive->dsc_overlap = 0; |
2448 | drive->driver_data = NULL; | |
dbc1272e | 2449 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
2450 | device_destroy(idetape_sysfs_class, |
2451 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
2452 | idetape_devs[tape->minor] = NULL; |
2453 | g->private_data = NULL; | |
2454 | put_disk(g); | |
2455 | kfree(tape); | |
2456 | } | |
2457 | ||
ecfd80e4 | 2458 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
2459 | static int proc_idetape_read_name |
2460 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2461 | { | |
2462 | ide_drive_t *drive = (ide_drive_t *) data; | |
2463 | idetape_tape_t *tape = drive->driver_data; | |
2464 | char *out = page; | |
2465 | int len; | |
2466 | ||
2467 | len = sprintf(out, "%s\n", tape->name); | |
2468 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2469 | } | |
2470 | ||
2471 | static ide_proc_entry_t idetape_proc[] = { | |
2472 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2473 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2474 | { NULL, 0, NULL, NULL } | |
2475 | }; | |
1da177e4 LT |
2476 | #endif |
2477 | ||
4031bbe4 | 2478 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 2479 | |
1da177e4 | 2480 | static ide_driver_t idetape_driver = { |
8604affd | 2481 | .gen_driver = { |
4ef3b8f4 | 2482 | .owner = THIS_MODULE, |
8604affd BZ |
2483 | .name = "ide-tape", |
2484 | .bus = &ide_bus_type, | |
8604affd | 2485 | }, |
4031bbe4 RK |
2486 | .probe = ide_tape_probe, |
2487 | .remove = ide_tape_remove, | |
1da177e4 LT |
2488 | .version = IDETAPE_VERSION, |
2489 | .media = ide_tape, | |
1da177e4 LT |
2490 | .do_request = idetape_do_request, |
2491 | .end_request = idetape_end_request, | |
2492 | .error = __ide_error, | |
7662d046 | 2493 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 | 2494 | .proc = idetape_proc, |
8185d5aa | 2495 | .settings = idetape_settings, |
7662d046 | 2496 | #endif |
1da177e4 LT |
2497 | }; |
2498 | ||
3c98bf34 | 2499 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 2500 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
2501 | .owner = THIS_MODULE, |
2502 | .read = idetape_chrdev_read, | |
2503 | .write = idetape_chrdev_write, | |
2504 | .ioctl = idetape_chrdev_ioctl, | |
2505 | .open = idetape_chrdev_open, | |
2506 | .release = idetape_chrdev_release, | |
2507 | }; | |
2508 | ||
2509 | static int idetape_open(struct inode *inode, struct file *filp) | |
2510 | { | |
2511 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2512 | struct ide_tape_obj *tape; | |
1da177e4 | 2513 | |
5a04cfa9 BP |
2514 | tape = ide_tape_get(disk); |
2515 | if (!tape) | |
1da177e4 LT |
2516 | return -ENXIO; |
2517 | ||
1da177e4 LT |
2518 | return 0; |
2519 | } | |
2520 | ||
2521 | static int idetape_release(struct inode *inode, struct file *filp) | |
2522 | { | |
2523 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2524 | struct ide_tape_obj *tape = ide_tape_g(disk); | |
1da177e4 LT |
2525 | |
2526 | ide_tape_put(tape); | |
2527 | ||
2528 | return 0; | |
2529 | } | |
2530 | ||
2531 | static int idetape_ioctl(struct inode *inode, struct file *file, | |
2532 | unsigned int cmd, unsigned long arg) | |
2533 | { | |
2534 | struct block_device *bdev = inode->i_bdev; | |
2535 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); | |
2536 | ide_drive_t *drive = tape->drive; | |
2537 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); | |
2538 | if (err == -EINVAL) | |
2539 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2540 | return err; | |
2541 | } | |
2542 | ||
2543 | static struct block_device_operations idetape_block_ops = { | |
2544 | .owner = THIS_MODULE, | |
2545 | .open = idetape_open, | |
2546 | .release = idetape_release, | |
2547 | .ioctl = idetape_ioctl, | |
2548 | }; | |
2549 | ||
4031bbe4 | 2550 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2551 | { |
2552 | idetape_tape_t *tape; | |
2553 | struct gendisk *g; | |
2554 | int minor; | |
2555 | ||
2556 | if (!strstr("ide-tape", drive->driver_req)) | |
2557 | goto failed; | |
2a924662 | 2558 | |
1da177e4 LT |
2559 | if (drive->media != ide_tape) |
2560 | goto failed; | |
2a924662 | 2561 | |
51509eec | 2562 | if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) { |
5a04cfa9 BP |
2563 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
2564 | " the driver\n", drive->name); | |
1da177e4 LT |
2565 | goto failed; |
2566 | } | |
5a04cfa9 | 2567 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2568 | if (tape == NULL) { |
5a04cfa9 BP |
2569 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2570 | drive->name); | |
1da177e4 LT |
2571 | goto failed; |
2572 | } | |
2573 | ||
2574 | g = alloc_disk(1 << PARTN_BITS); | |
2575 | if (!g) | |
2576 | goto out_free_tape; | |
2577 | ||
2578 | ide_init_disk(g, drive); | |
2579 | ||
1da177e4 LT |
2580 | kref_init(&tape->kref); |
2581 | ||
2582 | tape->drive = drive; | |
2583 | tape->driver = &idetape_driver; | |
2584 | tape->disk = g; | |
2585 | ||
2586 | g->private_data = &tape->driver; | |
2587 | ||
2588 | drive->driver_data = tape; | |
2589 | ||
cf8b8975 | 2590 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2591 | for (minor = 0; idetape_devs[minor]; minor++) |
2592 | ; | |
2593 | idetape_devs[minor] = tape; | |
cf8b8975 | 2594 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2595 | |
2596 | idetape_setup(drive, tape, minor); | |
2597 | ||
6ecaaf94 GKH |
2598 | device_create_drvdata(idetape_sysfs_class, &drive->gendev, |
2599 | MKDEV(IDETAPE_MAJOR, minor), NULL, | |
2600 | "%s", tape->name); | |
2601 | device_create_drvdata(idetape_sysfs_class, &drive->gendev, | |
2602 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
2603 | "n%s", tape->name); | |
d5dee80a | 2604 | |
1da177e4 LT |
2605 | g->fops = &idetape_block_ops; |
2606 | ide_register_region(g); | |
2607 | ||
2608 | return 0; | |
8604affd | 2609 | |
1da177e4 LT |
2610 | out_free_tape: |
2611 | kfree(tape); | |
2612 | failed: | |
8604affd | 2613 | return -ENODEV; |
1da177e4 LT |
2614 | } |
2615 | ||
5a04cfa9 | 2616 | static void __exit idetape_exit(void) |
1da177e4 | 2617 | { |
8604affd | 2618 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2619 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2620 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2621 | } | |
2622 | ||
17514e8a | 2623 | static int __init idetape_init(void) |
1da177e4 | 2624 | { |
d5dee80a WD |
2625 | int error = 1; |
2626 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2627 | if (IS_ERR(idetape_sysfs_class)) { | |
2628 | idetape_sysfs_class = NULL; | |
2629 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2630 | error = -EBUSY; | |
2631 | goto out; | |
2632 | } | |
2633 | ||
1da177e4 | 2634 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2635 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2636 | " interface\n"); | |
d5dee80a WD |
2637 | error = -EBUSY; |
2638 | goto out_free_class; | |
1da177e4 | 2639 | } |
d5dee80a WD |
2640 | |
2641 | error = driver_register(&idetape_driver.gen_driver); | |
2642 | if (error) | |
2643 | goto out_free_driver; | |
2644 | ||
2645 | return 0; | |
2646 | ||
2647 | out_free_driver: | |
2648 | driver_unregister(&idetape_driver.gen_driver); | |
2649 | out_free_class: | |
2650 | class_destroy(idetape_sysfs_class); | |
2651 | out: | |
2652 | return error; | |
1da177e4 LT |
2653 | } |
2654 | ||
263756ec | 2655 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2656 | module_init(idetape_init); |
2657 | module_exit(idetape_exit); | |
2658 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2659 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2660 | MODULE_LICENSE("GPL"); |