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 | ||
1da177e4 | 83 | /* |
3c98bf34 BP |
84 | * The following parameter is used to select the point in the internal tape fifo |
85 | * in which we will start to refill the buffer. Decreasing the following | |
86 | * parameter will improve the system's latency and interactive response, while | |
87 | * using a high value might improve system throughput. | |
1da177e4 | 88 | */ |
3c98bf34 | 89 | #define IDETAPE_FIFO_THRESHOLD 2 |
1da177e4 LT |
90 | |
91 | /* | |
3c98bf34 | 92 | * DSC polling parameters. |
1da177e4 | 93 | * |
3c98bf34 BP |
94 | * Polling for DSC (a single bit in the status register) is a very important |
95 | * function in ide-tape. There are two cases in which we poll for DSC: | |
1da177e4 | 96 | * |
3c98bf34 BP |
97 | * 1. Before a read/write packet command, to ensure that we can transfer data |
98 | * from/to the tape's data buffers, without causing an actual media access. | |
99 | * In case the tape is not ready yet, we take out our request from the device | |
100 | * request queue, so that ide.c could service requests from the other device | |
101 | * on the same interface in the meantime. | |
1da177e4 | 102 | * |
3c98bf34 BP |
103 | * 2. After the successful initialization of a "media access packet command", |
104 | * which is a command that can take a long time to complete (the interval can | |
105 | * range from several seconds to even an hour). Again, we postpone our request | |
106 | * in the middle to free the bus for the other device. The polling frequency | |
107 | * here should be lower than the read/write frequency since those media access | |
108 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST | |
109 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD | |
110 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). | |
1da177e4 | 111 | * |
3c98bf34 BP |
112 | * We also set a timeout for the timer, in case something goes wrong. The |
113 | * timeout should be longer then the maximum execution time of a tape operation. | |
1da177e4 | 114 | */ |
3c98bf34 BP |
115 | |
116 | /* DSC timings. */ | |
1da177e4 LT |
117 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
118 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ | |
119 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ | |
120 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ | |
121 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ | |
122 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ | |
123 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ | |
124 | ||
125 | /*************************** End of tunable parameters ***********************/ | |
126 | ||
54abf37e BP |
127 | /* tape directions */ |
128 | enum { | |
129 | IDETAPE_DIR_NONE = (1 << 0), | |
130 | IDETAPE_DIR_READ = (1 << 1), | |
131 | IDETAPE_DIR_WRITE = (1 << 2), | |
132 | }; | |
1da177e4 LT |
133 | |
134 | struct idetape_bh { | |
ab057968 | 135 | u32 b_size; |
1da177e4 LT |
136 | atomic_t b_count; |
137 | struct idetape_bh *b_reqnext; | |
138 | char *b_data; | |
139 | }; | |
140 | ||
03056b90 BP |
141 | /* Tape door status */ |
142 | #define DOOR_UNLOCKED 0 | |
143 | #define DOOR_LOCKED 1 | |
144 | #define DOOR_EXPLICITLY_LOCKED 2 | |
145 | ||
146 | /* Some defines for the SPACE command */ | |
147 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
148 | #define IDETAPE_SPACE_TO_EOD 3 | |
149 | ||
150 | /* Some defines for the LOAD UNLOAD command */ | |
151 | #define IDETAPE_LU_LOAD_MASK 1 | |
152 | #define IDETAPE_LU_RETENSION_MASK 2 | |
153 | #define IDETAPE_LU_EOT_MASK 4 | |
154 | ||
03056b90 BP |
155 | /* Error codes returned in rq->errors to the higher part of the driver. */ |
156 | #define IDETAPE_ERROR_GENERAL 101 | |
157 | #define IDETAPE_ERROR_FILEMARK 102 | |
158 | #define IDETAPE_ERROR_EOD 103 | |
159 | ||
160 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ | |
161 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
162 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
163 | ||
1da177e4 | 164 | /* |
3c98bf34 BP |
165 | * Most of our global data which we need to save even as we leave the driver due |
166 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
167 | */ |
168 | typedef struct ide_tape_obj { | |
169 | ide_drive_t *drive; | |
170 | ide_driver_t *driver; | |
171 | struct gendisk *disk; | |
172 | struct kref kref; | |
173 | ||
174 | /* | |
1da177e4 LT |
175 | * failed_pc points to the last failed packet command, or contains |
176 | * NULL if we do not need to retry any packet command. This is | |
177 | * required since an additional packet command is needed before the | |
178 | * retry, to get detailed information on what went wrong. | |
179 | */ | |
1da177e4 | 180 | /* Last failed packet command */ |
d236d74c | 181 | struct ide_atapi_pc *failed_pc; |
2e8a6f89 BZ |
182 | /* used by REQ_IDETAPE_{READ,WRITE} requests */ |
183 | struct ide_atapi_pc queued_pc; | |
394a4c21 | 184 | |
1da177e4 | 185 | /* |
3c98bf34 | 186 | * DSC polling variables. |
1da177e4 | 187 | * |
3c98bf34 BP |
188 | * While polling for DSC we use postponed_rq to postpone the current |
189 | * request so that ide.c will be able to service pending requests on the | |
190 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 191 | * data transfer) request in the device request queue. |
1da177e4 LT |
192 | */ |
193 | struct request *postponed_rq; | |
194 | /* The time in which we started polling for DSC */ | |
195 | unsigned long dsc_polling_start; | |
196 | /* Timer used to poll for dsc */ | |
197 | struct timer_list dsc_timer; | |
198 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
199 | unsigned long best_dsc_rw_freq; |
200 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
201 | unsigned long dsc_timeout; |
202 | ||
3c98bf34 | 203 | /* Read position information */ |
1da177e4 LT |
204 | u8 partition; |
205 | /* Current block */ | |
54bb2074 | 206 | unsigned int first_frame; |
1da177e4 | 207 | |
3c98bf34 | 208 | /* Last error information */ |
1da177e4 LT |
209 | u8 sense_key, asc, ascq; |
210 | ||
3c98bf34 | 211 | /* Character device operation */ |
1da177e4 LT |
212 | unsigned int minor; |
213 | /* device name */ | |
214 | char name[4]; | |
215 | /* Current character device data transfer direction */ | |
54abf37e | 216 | u8 chrdev_dir; |
1da177e4 | 217 | |
54bb2074 BP |
218 | /* tape block size, usually 512 or 1024 bytes */ |
219 | unsigned short blk_size; | |
1da177e4 | 220 | int user_bs_factor; |
b6422013 | 221 | |
1da177e4 | 222 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 223 | u8 caps[20]; |
1da177e4 LT |
224 | |
225 | /* | |
3c98bf34 | 226 | * Active data transfer request parameters. |
1da177e4 | 227 | * |
3c98bf34 BP |
228 | * At most, there is only one ide-tape originated data transfer request |
229 | * in the device request queue. This allows ide.c to easily service | |
230 | * requests from the other device when we postpone our active request. | |
1da177e4 | 231 | */ |
83042b24 | 232 | |
3c98bf34 | 233 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 234 | int buffer_size; |
077e3bdb BP |
235 | /* merge buffer */ |
236 | struct idetape_bh *merge_bh; | |
01a63aeb BP |
237 | /* size of the merge buffer */ |
238 | int merge_bh_size; | |
077e3bdb | 239 | /* pointer to current buffer head within the merge buffer */ |
1da177e4 LT |
240 | struct idetape_bh *bh; |
241 | char *b_data; | |
242 | int b_count; | |
3c98bf34 | 243 | |
a997a435 | 244 | int pages_per_buffer; |
1da177e4 LT |
245 | /* Wasted space in each stage */ |
246 | int excess_bh_size; | |
247 | ||
1da177e4 | 248 | /* protects the ide-tape queue */ |
54bb2074 | 249 | spinlock_t lock; |
1da177e4 | 250 | |
3c98bf34 | 251 | /* Measures average tape speed */ |
1da177e4 LT |
252 | unsigned long avg_time; |
253 | int avg_size; | |
254 | int avg_speed; | |
255 | ||
1da177e4 LT |
256 | /* the door is currently locked */ |
257 | int door_locked; | |
258 | /* the tape hardware is write protected */ | |
259 | char drv_write_prot; | |
260 | /* the tape is write protected (hardware or opened as read-only) */ | |
261 | char write_prot; | |
262 | ||
8004a8c9 | 263 | u32 debug_mask; |
1da177e4 LT |
264 | } idetape_tape_t; |
265 | ||
cf8b8975 | 266 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 267 | |
d5dee80a WD |
268 | static struct class *idetape_sysfs_class; |
269 | ||
1da177e4 LT |
270 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
271 | ||
272 | #define ide_tape_g(disk) \ | |
273 | container_of((disk)->private_data, struct ide_tape_obj, driver) | |
274 | ||
08da591e BZ |
275 | static void ide_tape_release(struct kref *); |
276 | ||
1da177e4 LT |
277 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
278 | { | |
279 | struct ide_tape_obj *tape = NULL; | |
280 | ||
cf8b8975 | 281 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 282 | tape = ide_tape_g(disk); |
08da591e | 283 | if (tape) { |
d3e33ff5 | 284 | if (ide_device_get(tape->drive)) |
08da591e | 285 | tape = NULL; |
d3e33ff5 BZ |
286 | else |
287 | kref_get(&tape->kref); | |
08da591e | 288 | } |
cf8b8975 | 289 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
290 | return tape; |
291 | } | |
292 | ||
1da177e4 LT |
293 | static void ide_tape_put(struct ide_tape_obj *tape) |
294 | { | |
d3e33ff5 BZ |
295 | ide_drive_t *drive = tape->drive; |
296 | ||
cf8b8975 | 297 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 298 | kref_put(&tape->kref, ide_tape_release); |
d3e33ff5 | 299 | ide_device_put(drive); |
cf8b8975 | 300 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
301 | } |
302 | ||
1da177e4 | 303 | /* |
3c98bf34 BP |
304 | * The variables below are used for the character device interface. Additional |
305 | * state variables are defined in our ide_drive_t structure. | |
1da177e4 | 306 | */ |
5a04cfa9 | 307 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
1da177e4 LT |
308 | |
309 | #define ide_tape_f(file) ((file)->private_data) | |
310 | ||
311 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) | |
312 | { | |
313 | struct ide_tape_obj *tape = NULL; | |
314 | ||
cf8b8975 | 315 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
316 | tape = idetape_devs[i]; |
317 | if (tape) | |
318 | kref_get(&tape->kref); | |
cf8b8975 | 319 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
320 | return tape; |
321 | } | |
322 | ||
d236d74c | 323 | static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 324 | unsigned int bcount) |
1da177e4 LT |
325 | { |
326 | struct idetape_bh *bh = pc->bh; | |
327 | int count; | |
328 | ||
329 | while (bcount) { | |
1da177e4 LT |
330 | if (bh == NULL) { |
331 | printk(KERN_ERR "ide-tape: bh == NULL in " | |
332 | "idetape_input_buffers\n"); | |
9f87abe8 | 333 | ide_pad_transfer(drive, 0, bcount); |
1da177e4 LT |
334 | return; |
335 | } | |
5a04cfa9 BP |
336 | count = min( |
337 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
338 | bcount); | |
374e042c | 339 | drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data + |
5a04cfa9 | 340 | atomic_read(&bh->b_count), count); |
1da177e4 LT |
341 | bcount -= count; |
342 | atomic_add(count, &bh->b_count); | |
343 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
344 | bh = bh->b_reqnext; | |
345 | if (bh) | |
346 | atomic_set(&bh->b_count, 0); | |
347 | } | |
348 | } | |
349 | pc->bh = bh; | |
350 | } | |
351 | ||
d236d74c | 352 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 353 | unsigned int bcount) |
1da177e4 LT |
354 | { |
355 | struct idetape_bh *bh = pc->bh; | |
356 | int count; | |
357 | ||
358 | while (bcount) { | |
1da177e4 | 359 | if (bh == NULL) { |
5a04cfa9 BP |
360 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
361 | __func__); | |
1da177e4 LT |
362 | return; |
363 | } | |
1da177e4 | 364 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
374e042c | 365 | drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); |
1da177e4 LT |
366 | bcount -= count; |
367 | pc->b_data += count; | |
368 | pc->b_count -= count; | |
369 | if (!pc->b_count) { | |
5a04cfa9 BP |
370 | bh = bh->b_reqnext; |
371 | pc->bh = bh; | |
1da177e4 LT |
372 | if (bh) { |
373 | pc->b_data = bh->b_data; | |
374 | pc->b_count = atomic_read(&bh->b_count); | |
375 | } | |
376 | } | |
377 | } | |
378 | } | |
379 | ||
646c0cb6 | 380 | static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
381 | { |
382 | struct idetape_bh *bh = pc->bh; | |
383 | int count; | |
d236d74c | 384 | unsigned int bcount = pc->xferred; |
1da177e4 | 385 | |
346331f8 | 386 | if (pc->flags & PC_FLAG_WRITING) |
1da177e4 LT |
387 | return; |
388 | while (bcount) { | |
1da177e4 | 389 | if (bh == NULL) { |
5a04cfa9 BP |
390 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
391 | __func__); | |
1da177e4 LT |
392 | return; |
393 | } | |
1da177e4 LT |
394 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
395 | atomic_set(&bh->b_count, count); | |
396 | if (atomic_read(&bh->b_count) == bh->b_size) | |
397 | bh = bh->b_reqnext; | |
398 | bcount -= count; | |
399 | } | |
400 | pc->bh = bh; | |
401 | } | |
402 | ||
1da177e4 | 403 | /* |
1b5db434 BP |
404 | * called on each failed packet command retry to analyze the request sense. We |
405 | * currently do not utilize this information. | |
1da177e4 | 406 | */ |
1b5db434 | 407 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
408 | { |
409 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 410 | struct ide_atapi_pc *pc = tape->failed_pc; |
1da177e4 | 411 | |
1b5db434 BP |
412 | tape->sense_key = sense[2] & 0xF; |
413 | tape->asc = sense[12]; | |
414 | tape->ascq = sense[13]; | |
8004a8c9 BP |
415 | |
416 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
417 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 418 | |
d236d74c | 419 | /* Correct pc->xferred by asking the tape. */ |
346331f8 | 420 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
d236d74c | 421 | pc->xferred = pc->req_xfer - |
54bb2074 | 422 | tape->blk_size * |
5d0cc8ae | 423 | get_unaligned_be32(&sense[3]); |
646c0cb6 | 424 | idetape_update_buffers(drive, pc); |
1da177e4 LT |
425 | } |
426 | ||
427 | /* | |
428 | * If error was the result of a zero-length read or write command, | |
429 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
430 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
431 | */ | |
90699ce2 | 432 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
433 | /* length == 0 */ |
434 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
435 | if (tape->sense_key == 5) { | |
1da177e4 LT |
436 | /* don't report an error, everything's ok */ |
437 | pc->error = 0; | |
438 | /* don't retry read/write */ | |
346331f8 | 439 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
440 | } |
441 | } | |
90699ce2 | 442 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
1da177e4 | 443 | pc->error = IDETAPE_ERROR_FILEMARK; |
346331f8 | 444 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 445 | } |
90699ce2 | 446 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
447 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
448 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
1da177e4 | 449 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 450 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
451 | } |
452 | } | |
90699ce2 | 453 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 454 | if (tape->sense_key == 8) { |
1da177e4 | 455 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 456 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 457 | } |
346331f8 | 458 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 459 | pc->xferred) |
1da177e4 LT |
460 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
461 | } | |
462 | } | |
463 | ||
d01dbc3b | 464 | /* Free data buffers completely. */ |
077e3bdb | 465 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) |
1da177e4 | 466 | { |
077e3bdb | 467 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; |
d01dbc3b BP |
468 | |
469 | while (bh) { | |
470 | u32 size = bh->b_size; | |
471 | ||
472 | while (size) { | |
473 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
474 | ||
475 | if (bh->b_data) | |
476 | free_pages((unsigned long)bh->b_data, order); | |
477 | ||
478 | size &= (order-1); | |
479 | bh->b_data += (1 << order) * PAGE_SIZE; | |
1da177e4 LT |
480 | } |
481 | prev_bh = bh; | |
482 | bh = bh->b_reqnext; | |
483 | kfree(prev_bh); | |
484 | } | |
1da177e4 LT |
485 | } |
486 | ||
1da177e4 LT |
487 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
488 | { | |
489 | struct request *rq = HWGROUP(drive)->rq; | |
490 | idetape_tape_t *tape = drive->driver_data; | |
491 | unsigned long flags; | |
492 | int error; | |
1da177e4 | 493 | |
8004a8c9 | 494 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
495 | |
496 | switch (uptodate) { | |
5a04cfa9 BP |
497 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
498 | case 1: error = 0; break; | |
499 | default: error = uptodate; | |
1da177e4 LT |
500 | } |
501 | rq->errors = error; | |
502 | if (error) | |
503 | tape->failed_pc = NULL; | |
504 | ||
3687221f BZ |
505 | if (!blk_special_request(rq)) { |
506 | ide_end_request(drive, uptodate, nr_sects); | |
507 | return 0; | |
508 | } | |
509 | ||
54bb2074 | 510 | spin_lock_irqsave(&tape->lock, flags); |
1da177e4 | 511 | |
1da177e4 | 512 | ide_end_drive_cmd(drive, 0, 0); |
1da177e4 | 513 | |
54bb2074 | 514 | spin_unlock_irqrestore(&tape->lock, flags); |
1da177e4 LT |
515 | return 0; |
516 | } | |
517 | ||
b14c7212 BZ |
518 | static void ide_tape_handle_dsc(ide_drive_t *); |
519 | ||
520 | static void ide_tape_callback(ide_drive_t *drive, int dsc) | |
1da177e4 LT |
521 | { |
522 | idetape_tape_t *tape = drive->driver_data; | |
2b9efba4 | 523 | struct ide_atapi_pc *pc = drive->pc; |
5985e6ab | 524 | int uptodate = pc->error ? 0 : 1; |
1da177e4 | 525 | |
8004a8c9 BP |
526 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
527 | ||
b14c7212 BZ |
528 | if (dsc) |
529 | ide_tape_handle_dsc(drive); | |
530 | ||
dd2e9a03 BZ |
531 | if (tape->failed_pc == pc) |
532 | tape->failed_pc = NULL; | |
533 | ||
5985e6ab BZ |
534 | if (pc->c[0] == REQUEST_SENSE) { |
535 | if (uptodate) | |
536 | idetape_analyze_error(drive, pc->buf); | |
537 | else | |
538 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
539 | "itself - Aborting request!\n"); | |
540 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
541 | struct request *rq = drive->hwif->hwgroup->rq; | |
542 | int blocks = pc->xferred / tape->blk_size; | |
543 | ||
544 | tape->avg_size += blocks * tape->blk_size; | |
545 | ||
546 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
547 | tape->avg_speed = tape->avg_size * HZ / | |
548 | (jiffies - tape->avg_time) / 1024; | |
549 | tape->avg_size = 0; | |
550 | tape->avg_time = jiffies; | |
551 | } | |
552 | ||
553 | tape->first_frame += blocks; | |
554 | rq->current_nr_sectors -= blocks; | |
555 | ||
556 | if (pc->error) | |
557 | uptodate = pc->error; | |
558 | } else if (pc->c[0] == READ_POSITION && uptodate) { | |
2b9efba4 | 559 | u8 *readpos = pc->buf; |
5985e6ab BZ |
560 | |
561 | debug_log(DBG_SENSE, "BOP - %s\n", | |
562 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
563 | debug_log(DBG_SENSE, "EOP - %s\n", | |
564 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
565 | ||
566 | if (readpos[0] & 0x4) { | |
567 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
568 | "to the tape\n"); | |
f2e3ab52 | 569 | clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab BZ |
570 | uptodate = 0; |
571 | } else { | |
572 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
cd740ab0 | 573 | be32_to_cpup((__be32 *)&readpos[4])); |
5985e6ab BZ |
574 | |
575 | tape->partition = readpos[1]; | |
cd740ab0 | 576 | tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); |
f2e3ab52 | 577 | set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 578 | } |
1da177e4 | 579 | } |
5985e6ab BZ |
580 | |
581 | idetape_end_request(drive, uptodate, 0); | |
1da177e4 LT |
582 | } |
583 | ||
1da177e4 | 584 | /* |
3c98bf34 BP |
585 | * Postpone the current request so that ide.c will be able to service requests |
586 | * from another device on the same hwgroup while we are polling for DSC. | |
1da177e4 | 587 | */ |
5a04cfa9 | 588 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
589 | { |
590 | idetape_tape_t *tape = drive->driver_data; | |
591 | ||
8004a8c9 BP |
592 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
593 | ||
1da177e4 | 594 | tape->postponed_rq = HWGROUP(drive)->rq; |
54bb2074 | 595 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
596 | } |
597 | ||
74e63e74 BZ |
598 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
599 | { | |
600 | idetape_tape_t *tape = drive->driver_data; | |
601 | ||
602 | /* Media access command */ | |
603 | tape->dsc_polling_start = jiffies; | |
604 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
605 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
606 | /* Allow ide.c to handle other requests */ | |
607 | idetape_postpone_request(drive); | |
608 | } | |
609 | ||
acaa0f5f | 610 | static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
08424ac2 BZ |
611 | unsigned int bcount, int write) |
612 | { | |
613 | if (write) | |
614 | idetape_output_buffers(drive, pc, bcount); | |
615 | else | |
616 | idetape_input_buffers(drive, pc, bcount); | |
acaa0f5f BZ |
617 | |
618 | return bcount; | |
08424ac2 | 619 | } |
a1efc85f | 620 | |
1da177e4 | 621 | /* |
3c98bf34 | 622 | * Packet Command Interface |
1da177e4 | 623 | * |
2b9efba4 | 624 | * The current Packet Command is available in drive->pc, and will not change |
3c98bf34 BP |
625 | * until we finish handling it. Each packet command is associated with a |
626 | * callback function that will be called when the command is finished. | |
1da177e4 | 627 | * |
3c98bf34 | 628 | * The handling will be done in three stages: |
1da177e4 | 629 | * |
3c98bf34 | 630 | * 1. idetape_issue_pc will send the packet command to the drive, and will set |
aa5d2de7 | 631 | * the interrupt handler to ide_pc_intr. |
1da177e4 | 632 | * |
aa5d2de7 | 633 | * 2. On each interrupt, ide_pc_intr will be called. This step will be |
3c98bf34 | 634 | * repeated until the device signals us that no more interrupts will be issued. |
1da177e4 | 635 | * |
3c98bf34 BP |
636 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
637 | * process. In case of a successful initiation of a media access packet command, | |
638 | * the DSC bit will be set when the actual execution of the command is finished. | |
639 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
640 | * event. In this case, we define the request as "low priority request" by | |
641 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
642 | * exit the driver. | |
1da177e4 | 643 | * |
3c98bf34 BP |
644 | * ide.c will then give higher priority to requests which originate from the |
645 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 646 | * |
3c98bf34 | 647 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 648 | * |
3c98bf34 BP |
649 | * 5. In case an error was found, we queue a request sense packet command in |
650 | * front of the request queue and retry the operation up to | |
651 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 652 | * |
3c98bf34 BP |
653 | * 6. In case no error was found, or we decided to give up and not to retry |
654 | * again, the callback function will be called and then we will handle the next | |
655 | * request. | |
1da177e4 | 656 | */ |
1da177e4 | 657 | |
d236d74c BP |
658 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
659 | struct ide_atapi_pc *pc) | |
1da177e4 | 660 | { |
1da177e4 | 661 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 662 | |
2b9efba4 | 663 | if (drive->pc->c[0] == REQUEST_SENSE && |
90699ce2 | 664 | pc->c[0] == REQUEST_SENSE) { |
1da177e4 LT |
665 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
666 | "Two request sense in serial were issued\n"); | |
667 | } | |
1da177e4 | 668 | |
90699ce2 | 669 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
1da177e4 | 670 | tape->failed_pc = pc; |
2b9efba4 | 671 | |
1da177e4 | 672 | /* Set the current packet command */ |
2b9efba4 | 673 | drive->pc = pc; |
1da177e4 LT |
674 | |
675 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 676 | (pc->flags & PC_FLAG_ABORT)) { |
1da177e4 | 677 | /* |
3c98bf34 BP |
678 | * We will "abort" retrying a packet command in case legitimate |
679 | * error code was received (crossing a filemark, or end of the | |
680 | * media, for example). | |
1da177e4 | 681 | */ |
346331f8 | 682 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 683 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
684 | tape->sense_key == 2 && tape->asc == 4 && |
685 | (tape->ascq == 1 || tape->ascq == 8))) { | |
686 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
687 | "pc = %2x, key = %2x, " | |
688 | "asc = %2x, ascq = %2x\n", | |
689 | tape->name, pc->c[0], | |
690 | tape->sense_key, tape->asc, | |
691 | tape->ascq); | |
692 | } | |
693 | /* Giving up */ | |
694 | pc->error = IDETAPE_ERROR_GENERAL; | |
695 | } | |
696 | tape->failed_pc = NULL; | |
b14c7212 | 697 | drive->pc_callback(drive, 0); |
92f5daff | 698 | return ide_stopped; |
1da177e4 | 699 | } |
8004a8c9 | 700 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
701 | |
702 | pc->retries++; | |
1da177e4 | 703 | |
baf08f0b | 704 | return ide_issue_pc(drive, WAIT_TAPE_CMD, NULL); |
1da177e4 LT |
705 | } |
706 | ||
3c98bf34 | 707 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 708 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 | 709 | { |
7bf7420a | 710 | ide_init_pc(pc); |
90699ce2 | 711 | pc->c[0] = MODE_SENSE; |
1da177e4 | 712 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
713 | /* DBD = 1 - Don't return block descriptors */ |
714 | pc->c[1] = 8; | |
1da177e4 LT |
715 | pc->c[2] = page_code; |
716 | /* | |
717 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
718 | * | |
719 | * For SCSI this byte is defined as subpage instead of high byte | |
720 | * of length and some IDE drives seem to interpret it this way | |
721 | * and return an error when 255 is used. | |
722 | */ | |
723 | pc->c[3] = 0; | |
3c98bf34 BP |
724 | /* We will just discard data in that case */ |
725 | pc->c[4] = 255; | |
1da177e4 | 726 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 727 | pc->req_xfer = 12; |
1da177e4 | 728 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 729 | pc->req_xfer = 24; |
1da177e4 | 730 | else |
d236d74c | 731 | pc->req_xfer = 50; |
1da177e4 LT |
732 | } |
733 | ||
5a04cfa9 | 734 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 735 | { |
b73c7ee2 | 736 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 737 | idetape_tape_t *tape = drive->driver_data; |
2b9efba4 | 738 | struct ide_atapi_pc *pc = drive->pc; |
22c525b9 | 739 | u8 stat; |
1da177e4 | 740 | |
374e042c | 741 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 742 | |
3a7d2484 BZ |
743 | if (stat & ATA_DSC) { |
744 | if (stat & ATA_ERR) { | |
1da177e4 | 745 | /* Error detected */ |
90699ce2 | 746 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
747 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
748 | tape->name); | |
749 | /* Retry operation */ | |
6b0da28b | 750 | ide_retry_pc(drive, tape->disk); |
258ec411 | 751 | return ide_stopped; |
1da177e4 LT |
752 | } |
753 | pc->error = 0; | |
1da177e4 LT |
754 | } else { |
755 | pc->error = IDETAPE_ERROR_GENERAL; | |
756 | tape->failed_pc = NULL; | |
757 | } | |
b14c7212 | 758 | drive->pc_callback(drive, 0); |
1da177e4 LT |
759 | return ide_stopped; |
760 | } | |
761 | ||
cd2abbfe | 762 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
763 | struct ide_atapi_pc *pc, struct request *rq, |
764 | u8 opcode) | |
1da177e4 | 765 | { |
0014c75b BP |
766 | struct idetape_bh *bh = (struct idetape_bh *)rq->special; |
767 | unsigned int length = rq->current_nr_sectors; | |
768 | ||
7bf7420a | 769 | ide_init_pc(pc); |
860ff5ec | 770 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 771 | pc->c[1] = 1; |
1da177e4 | 772 | pc->bh = bh; |
d236d74c BP |
773 | pc->buf = NULL; |
774 | pc->buf_size = length * tape->blk_size; | |
775 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 776 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 777 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 778 | |
cd2abbfe BP |
779 | if (opcode == READ_6) { |
780 | pc->c[0] = READ_6; | |
781 | atomic_set(&bh->b_count, 0); | |
782 | } else if (opcode == WRITE_6) { | |
783 | pc->c[0] = WRITE_6; | |
784 | pc->flags |= PC_FLAG_WRITING; | |
785 | pc->b_data = bh->b_data; | |
786 | pc->b_count = atomic_read(&bh->b_count); | |
787 | } | |
0014c75b BP |
788 | |
789 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
790 | } |
791 | ||
1da177e4 LT |
792 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
793 | struct request *rq, sector_t block) | |
794 | { | |
b73c7ee2 | 795 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 796 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 797 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 798 | struct request *postponed_rq = tape->postponed_rq; |
22c525b9 | 799 | u8 stat; |
1da177e4 | 800 | |
730616b2 MW |
801 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu," |
802 | " current_nr_sectors: %u\n", | |
803 | (unsigned long long)rq->sector, rq->nr_sectors, | |
804 | rq->current_nr_sectors); | |
1da177e4 | 805 | |
4aff5e23 | 806 | if (!blk_special_request(rq)) { |
3c98bf34 | 807 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 808 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 809 | "request queue (%d)\n", drive->name, rq->cmd_type); |
1da177e4 LT |
810 | ide_end_request(drive, 0, 0); |
811 | return ide_stopped; | |
812 | } | |
813 | ||
3c98bf34 | 814 | /* Retry a failed packet command */ |
2b9efba4 | 815 | if (tape->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { |
28c7214b BZ |
816 | pc = tape->failed_pc; |
817 | goto out; | |
818 | } | |
5a04cfa9 | 819 | |
1da177e4 LT |
820 | if (postponed_rq != NULL) |
821 | if (rq != postponed_rq) { | |
822 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
823 | "Two DSC requests were queued\n"); | |
824 | idetape_end_request(drive, 0, 0); | |
825 | return ide_stopped; | |
826 | } | |
1da177e4 LT |
827 | |
828 | tape->postponed_rq = NULL; | |
829 | ||
830 | /* | |
831 | * If the tape is still busy, postpone our request and service | |
832 | * the other device meanwhile. | |
833 | */ | |
374e042c | 834 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 835 | |
83dd5735 | 836 | if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2)) |
f2e3ab52 | 837 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 LT |
838 | |
839 | if (drive->post_reset == 1) { | |
f2e3ab52 | 840 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 LT |
841 | drive->post_reset = 0; |
842 | } | |
843 | ||
f2e3ab52 | 844 | if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && |
3a7d2484 | 845 | (stat & ATA_DSC) == 0) { |
1da177e4 LT |
846 | if (postponed_rq == NULL) { |
847 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 848 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
849 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
850 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
851 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
852 | tape->name); | |
83dd5735 | 853 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
854 | idetape_media_access_finished(drive); |
855 | return ide_stopped; | |
856 | } else { | |
857 | return ide_do_reset(drive); | |
858 | } | |
5a04cfa9 BP |
859 | } else if (time_after(jiffies, |
860 | tape->dsc_polling_start + | |
861 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 862 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
863 | idetape_postpone_request(drive); |
864 | return ide_stopped; | |
865 | } | |
83dd5735 | 866 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
2e8a6f89 | 867 | pc = &tape->queued_pc; |
0014c75b | 868 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
869 | goto out; |
870 | } | |
83dd5735 | 871 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
2e8a6f89 | 872 | pc = &tape->queued_pc; |
0014c75b | 873 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
874 | goto out; |
875 | } | |
83dd5735 | 876 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
d236d74c | 877 | pc = (struct ide_atapi_pc *) rq->buffer; |
83dd5735 BP |
878 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
879 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
880 | goto out; |
881 | } | |
83dd5735 | 882 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
883 | idetape_media_access_finished(drive); |
884 | return ide_stopped; | |
885 | } | |
886 | BUG(); | |
28c7214b | 887 | |
f2e3ab52 | 888 | out: |
8d06bfad | 889 | return idetape_issue_pc(drive, pc); |
1da177e4 LT |
890 | } |
891 | ||
1da177e4 | 892 | /* |
41aa1706 | 893 | * The function below uses __get_free_pages to allocate a data buffer of size |
f73850a3 | 894 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
3c98bf34 | 895 | * much as possible. |
1da177e4 | 896 | * |
41aa1706 BP |
897 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
898 | * failure. | |
1da177e4 | 899 | */ |
077e3bdb BP |
900 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, |
901 | int full, int clear) | |
1da177e4 | 902 | { |
077e3bdb | 903 | struct idetape_bh *prev_bh, *bh, *merge_bh; |
a997a435 | 904 | int pages = tape->pages_per_buffer; |
41aa1706 | 905 | unsigned int order, b_allocd; |
1da177e4 LT |
906 | char *b_data = NULL; |
907 | ||
077e3bdb BP |
908 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
909 | bh = merge_bh; | |
1da177e4 LT |
910 | if (bh == NULL) |
911 | goto abort; | |
41aa1706 BP |
912 | |
913 | order = fls(pages) - 1; | |
914 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 915 | if (!bh->b_data) |
1da177e4 | 916 | goto abort; |
41aa1706 BP |
917 | b_allocd = (1 << order) * PAGE_SIZE; |
918 | pages &= (order-1); | |
919 | ||
1da177e4 | 920 | if (clear) |
41aa1706 BP |
921 | memset(bh->b_data, 0, b_allocd); |
922 | bh->b_reqnext = NULL; | |
923 | bh->b_size = b_allocd; | |
1da177e4 LT |
924 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
925 | ||
41aa1706 BP |
926 | while (pages) { |
927 | order = fls(pages) - 1; | |
928 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 929 | if (!b_data) |
1da177e4 | 930 | goto abort; |
41aa1706 BP |
931 | b_allocd = (1 << order) * PAGE_SIZE; |
932 | ||
1da177e4 | 933 | if (clear) |
41aa1706 BP |
934 | memset(b_data, 0, b_allocd); |
935 | ||
936 | /* newly allocated page frames below buffer header or ...*/ | |
937 | if (bh->b_data == b_data + b_allocd) { | |
938 | bh->b_size += b_allocd; | |
939 | bh->b_data -= b_allocd; | |
1da177e4 | 940 | if (full) |
41aa1706 | 941 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
942 | continue; |
943 | } | |
41aa1706 | 944 | /* they are above the header */ |
1da177e4 | 945 | if (b_data == bh->b_data + bh->b_size) { |
41aa1706 | 946 | bh->b_size += b_allocd; |
1da177e4 | 947 | if (full) |
41aa1706 | 948 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
949 | continue; |
950 | } | |
951 | prev_bh = bh; | |
5a04cfa9 BP |
952 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
953 | if (!bh) { | |
41aa1706 | 954 | free_pages((unsigned long) b_data, order); |
1da177e4 LT |
955 | goto abort; |
956 | } | |
957 | bh->b_reqnext = NULL; | |
958 | bh->b_data = b_data; | |
41aa1706 | 959 | bh->b_size = b_allocd; |
1da177e4 LT |
960 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
961 | prev_bh->b_reqnext = bh; | |
41aa1706 BP |
962 | |
963 | pages &= (order-1); | |
1da177e4 | 964 | } |
41aa1706 | 965 | |
1da177e4 LT |
966 | bh->b_size -= tape->excess_bh_size; |
967 | if (full) | |
968 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
077e3bdb | 969 | return merge_bh; |
1da177e4 | 970 | abort: |
077e3bdb | 971 | ide_tape_kfree_buffer(tape); |
1da177e4 LT |
972 | return NULL; |
973 | } | |
974 | ||
5a04cfa9 | 975 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
8646c88f | 976 | const char __user *buf, int n) |
1da177e4 LT |
977 | { |
978 | struct idetape_bh *bh = tape->bh; | |
979 | int count; | |
dcd96379 | 980 | int ret = 0; |
1da177e4 LT |
981 | |
982 | while (n) { | |
1da177e4 | 983 | if (bh == NULL) { |
5a04cfa9 BP |
984 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
985 | __func__); | |
dcd96379 | 986 | return 1; |
1da177e4 | 987 | } |
5a04cfa9 BP |
988 | count = min((unsigned int) |
989 | (bh->b_size - atomic_read(&bh->b_count)), | |
990 | (unsigned int)n); | |
991 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
992 | count)) | |
dcd96379 | 993 | ret = 1; |
1da177e4 LT |
994 | n -= count; |
995 | atomic_add(count, &bh->b_count); | |
996 | buf += count; | |
997 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
998 | bh = bh->b_reqnext; | |
999 | if (bh) | |
1000 | atomic_set(&bh->b_count, 0); | |
1001 | } | |
1002 | } | |
1003 | tape->bh = bh; | |
dcd96379 | 1004 | return ret; |
1da177e4 LT |
1005 | } |
1006 | ||
5a04cfa9 | 1007 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
99d74e61 | 1008 | int n) |
1da177e4 LT |
1009 | { |
1010 | struct idetape_bh *bh = tape->bh; | |
1011 | int count; | |
dcd96379 | 1012 | int ret = 0; |
1da177e4 LT |
1013 | |
1014 | while (n) { | |
1da177e4 | 1015 | if (bh == NULL) { |
5a04cfa9 BP |
1016 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1017 | __func__); | |
dcd96379 | 1018 | return 1; |
1da177e4 | 1019 | } |
1da177e4 | 1020 | count = min(tape->b_count, n); |
dcd96379 DW |
1021 | if (copy_to_user(buf, tape->b_data, count)) |
1022 | ret = 1; | |
1da177e4 LT |
1023 | n -= count; |
1024 | tape->b_data += count; | |
1025 | tape->b_count -= count; | |
1026 | buf += count; | |
1027 | if (!tape->b_count) { | |
5a04cfa9 BP |
1028 | bh = bh->b_reqnext; |
1029 | tape->bh = bh; | |
1da177e4 LT |
1030 | if (bh) { |
1031 | tape->b_data = bh->b_data; | |
1032 | tape->b_count = atomic_read(&bh->b_count); | |
1033 | } | |
1034 | } | |
1035 | } | |
dcd96379 | 1036 | return ret; |
1da177e4 LT |
1037 | } |
1038 | ||
077e3bdb | 1039 | static void idetape_init_merge_buffer(idetape_tape_t *tape) |
1da177e4 | 1040 | { |
077e3bdb BP |
1041 | struct idetape_bh *bh = tape->merge_bh; |
1042 | tape->bh = tape->merge_bh; | |
5a04cfa9 | 1043 | |
54abf37e | 1044 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 LT |
1045 | atomic_set(&bh->b_count, 0); |
1046 | else { | |
1047 | tape->b_data = bh->b_data; | |
1048 | tape->b_count = atomic_read(&bh->b_count); | |
1049 | } | |
1050 | } | |
1051 | ||
1da177e4 | 1052 | /* |
3c98bf34 BP |
1053 | * Write a filemark if write_filemark=1. Flush the device buffers without |
1054 | * writing a filemark otherwise. | |
1da177e4 | 1055 | */ |
5a04cfa9 | 1056 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 1057 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 | 1058 | { |
7bf7420a | 1059 | ide_init_pc(pc); |
90699ce2 | 1060 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 1061 | pc->c[4] = write_filemark; |
346331f8 | 1062 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1063 | } |
1064 | ||
1da177e4 LT |
1065 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
1066 | { | |
1067 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1068 | struct gendisk *disk = tape->disk; |
1da177e4 LT |
1069 | int load_attempted = 0; |
1070 | ||
3c98bf34 | 1071 | /* Wait for the tape to become ready */ |
f2e3ab52 | 1072 | set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
1da177e4 LT |
1073 | timeout += jiffies; |
1074 | while (time_before(jiffies, timeout)) { | |
de699ad5 | 1075 | if (ide_do_test_unit_ready(drive, disk) == 0) |
1da177e4 LT |
1076 | return 0; |
1077 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
1078 | || (tape->asc == 0x3A)) { |
1079 | /* no media */ | |
1da177e4 LT |
1080 | if (load_attempted) |
1081 | return -ENOMEDIUM; | |
0c8a6c7a | 1082 | ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
1da177e4 LT |
1083 | load_attempted = 1; |
1084 | /* not about to be ready */ | |
1085 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1086 | (tape->ascq == 1 || tape->ascq == 8))) | |
1087 | return -EIO; | |
80ce45fd | 1088 | msleep(100); |
1da177e4 LT |
1089 | } |
1090 | return -EIO; | |
1091 | } | |
1092 | ||
5a04cfa9 | 1093 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 1094 | { |
2ac07d92 | 1095 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1096 | struct ide_atapi_pc pc; |
1da177e4 LT |
1097 | int rc; |
1098 | ||
1099 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
2ac07d92 | 1100 | rc = ide_queue_pc_tail(drive, tape->disk, &pc); |
5a04cfa9 | 1101 | if (rc) |
1da177e4 LT |
1102 | return rc; |
1103 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1104 | return 0; | |
1105 | } | |
1106 | ||
d236d74c | 1107 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1108 | { |
7bf7420a | 1109 | ide_init_pc(pc); |
90699ce2 | 1110 | pc->c[0] = READ_POSITION; |
d236d74c | 1111 | pc->req_xfer = 20; |
1da177e4 LT |
1112 | } |
1113 | ||
5a04cfa9 | 1114 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
1115 | { |
1116 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1117 | struct ide_atapi_pc pc; |
1da177e4 LT |
1118 | int position; |
1119 | ||
8004a8c9 | 1120 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
1121 | |
1122 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1123 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) |
1da177e4 | 1124 | return -1; |
54bb2074 | 1125 | position = tape->first_frame; |
1da177e4 LT |
1126 | return position; |
1127 | } | |
1128 | ||
d236d74c BP |
1129 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
1130 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1131 | unsigned int block, u8 partition, int skip) |
1da177e4 | 1132 | { |
7bf7420a | 1133 | ide_init_pc(pc); |
90699ce2 | 1134 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 1135 | pc->c[1] = 2; |
860ff5ec | 1136 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 1137 | pc->c[8] = partition; |
346331f8 | 1138 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1139 | } |
1140 | ||
ec0fdb01 | 1141 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1142 | { |
1143 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1144 | |
54abf37e | 1145 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 1146 | return; |
1da177e4 | 1147 | |
f2e3ab52 | 1148 | clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); |
01a63aeb | 1149 | tape->merge_bh_size = 0; |
077e3bdb BP |
1150 | if (tape->merge_bh != NULL) { |
1151 | ide_tape_kfree_buffer(tape); | |
1152 | tape->merge_bh = NULL; | |
1da177e4 LT |
1153 | } |
1154 | ||
54abf37e | 1155 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1156 | } |
1157 | ||
1158 | /* | |
3c98bf34 BP |
1159 | * Position the tape to the requested block using the LOCATE packet command. |
1160 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1161 | * all higher level operations, we queue the commands at the tail of the request | |
1162 | * queue and wait for their completion. | |
1da177e4 | 1163 | */ |
5a04cfa9 BP |
1164 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
1165 | u8 partition, int skip) | |
1da177e4 LT |
1166 | { |
1167 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1168 | struct gendisk *disk = tape->disk; |
1da177e4 | 1169 | int retval; |
d236d74c | 1170 | struct ide_atapi_pc pc; |
1da177e4 | 1171 | |
54abf37e | 1172 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 1173 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1174 | idetape_wait_ready(drive, 60 * 5 * HZ); |
1175 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
2ac07d92 | 1176 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1177 | if (retval) |
1178 | return (retval); | |
1179 | ||
1180 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1181 | return ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1182 | } |
1183 | ||
ec0fdb01 | 1184 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 1185 | int restore_position) |
1da177e4 LT |
1186 | { |
1187 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1188 | int seek, position; |
1189 | ||
ec0fdb01 | 1190 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1191 | if (restore_position) { |
1192 | position = idetape_read_position(drive); | |
9798630a | 1193 | seek = position > 0 ? position : 0; |
1da177e4 | 1194 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 1195 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 1196 | " %s\n", tape->name, __func__); |
1da177e4 LT |
1197 | return; |
1198 | } | |
1199 | } | |
1200 | } | |
1201 | ||
1202 | /* | |
3c98bf34 BP |
1203 | * Generate a read/write request for the block device interface and wait for it |
1204 | * to be serviced. | |
1da177e4 | 1205 | */ |
5a04cfa9 BP |
1206 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
1207 | struct idetape_bh *bh) | |
1da177e4 LT |
1208 | { |
1209 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a FT |
1210 | struct request *rq; |
1211 | int ret, errors; | |
1da177e4 | 1212 | |
8004a8c9 BP |
1213 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
1214 | ||
64ea1b4a FT |
1215 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1216 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1217 | rq->cmd[13] = cmd; |
64ea1b4a FT |
1218 | rq->rq_disk = tape->disk; |
1219 | rq->special = (void *)bh; | |
1220 | rq->sector = tape->first_frame; | |
1221 | rq->nr_sectors = blocks; | |
1222 | rq->current_nr_sectors = blocks; | |
1223 | blk_execute_rq(drive->queue, tape->disk, rq, 0); | |
1224 | ||
1225 | errors = rq->errors; | |
1226 | ret = tape->blk_size * (blocks - rq->current_nr_sectors); | |
1227 | blk_put_request(rq); | |
1da177e4 LT |
1228 | |
1229 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1230 | return 0; | |
1231 | ||
077e3bdb BP |
1232 | if (tape->merge_bh) |
1233 | idetape_init_merge_buffer(tape); | |
64ea1b4a | 1234 | if (errors == IDETAPE_ERROR_GENERAL) |
1da177e4 | 1235 | return -EIO; |
64ea1b4a | 1236 | return ret; |
1da177e4 LT |
1237 | } |
1238 | ||
d236d74c | 1239 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1240 | { |
7bf7420a | 1241 | ide_init_pc(pc); |
90699ce2 | 1242 | pc->c[0] = INQUIRY; |
5a04cfa9 | 1243 | pc->c[4] = 254; |
d236d74c | 1244 | pc->req_xfer = 254; |
1da177e4 LT |
1245 | } |
1246 | ||
d236d74c BP |
1247 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
1248 | struct ide_atapi_pc *pc) | |
1da177e4 | 1249 | { |
7bf7420a | 1250 | ide_init_pc(pc); |
90699ce2 | 1251 | pc->c[0] = REZERO_UNIT; |
346331f8 | 1252 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1253 | } |
1254 | ||
d236d74c | 1255 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1256 | { |
7bf7420a | 1257 | ide_init_pc(pc); |
90699ce2 | 1258 | pc->c[0] = ERASE; |
1da177e4 | 1259 | pc->c[1] = 1; |
346331f8 | 1260 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1261 | } |
1262 | ||
d236d74c | 1263 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 | 1264 | { |
7bf7420a | 1265 | ide_init_pc(pc); |
90699ce2 | 1266 | pc->c[0] = SPACE; |
860ff5ec | 1267 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 1268 | pc->c[1] = cmd; |
346331f8 | 1269 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1270 | } |
1271 | ||
97c566ce | 1272 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 1273 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1274 | { |
1275 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1276 | |
8004a8c9 | 1277 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 1278 | |
0aa4b01e | 1279 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
077e3bdb | 1280 | blocks, tape->merge_bh); |
1da177e4 LT |
1281 | } |
1282 | ||
d9df937a | 1283 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1284 | { |
1285 | idetape_tape_t *tape = drive->driver_data; | |
1286 | int blocks, min; | |
1287 | struct idetape_bh *bh; | |
55a5d291 | 1288 | |
54abf37e | 1289 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 1290 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 1291 | " but we are not writing.\n"); |
1da177e4 LT |
1292 | return; |
1293 | } | |
01a63aeb | 1294 | if (tape->merge_bh_size > tape->buffer_size) { |
1da177e4 | 1295 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
01a63aeb | 1296 | tape->merge_bh_size = tape->buffer_size; |
1da177e4 | 1297 | } |
01a63aeb BP |
1298 | if (tape->merge_bh_size) { |
1299 | blocks = tape->merge_bh_size / tape->blk_size; | |
1300 | if (tape->merge_bh_size % tape->blk_size) { | |
1da177e4 LT |
1301 | unsigned int i; |
1302 | ||
1303 | blocks++; | |
01a63aeb | 1304 | i = tape->blk_size - tape->merge_bh_size % |
54bb2074 | 1305 | tape->blk_size; |
1da177e4 LT |
1306 | bh = tape->bh->b_reqnext; |
1307 | while (bh) { | |
1308 | atomic_set(&bh->b_count, 0); | |
1309 | bh = bh->b_reqnext; | |
1310 | } | |
1311 | bh = tape->bh; | |
1312 | while (i) { | |
1313 | if (bh == NULL) { | |
5a04cfa9 BP |
1314 | printk(KERN_INFO "ide-tape: bug," |
1315 | " bh NULL\n"); | |
1da177e4 LT |
1316 | break; |
1317 | } | |
5a04cfa9 BP |
1318 | min = min(i, (unsigned int)(bh->b_size - |
1319 | atomic_read(&bh->b_count))); | |
1320 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1321 | 0, min); | |
1da177e4 LT |
1322 | atomic_add(min, &bh->b_count); |
1323 | i -= min; | |
1324 | bh = bh->b_reqnext; | |
1325 | } | |
1326 | } | |
1327 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
01a63aeb | 1328 | tape->merge_bh_size = 0; |
1da177e4 | 1329 | } |
077e3bdb BP |
1330 | if (tape->merge_bh != NULL) { |
1331 | ide_tape_kfree_buffer(tape); | |
1332 | tape->merge_bh = NULL; | |
1da177e4 | 1333 | } |
54abf37e | 1334 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1335 | } |
1336 | ||
83042b24 | 1337 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
1338 | { |
1339 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1340 | int bytes_read; |
1da177e4 LT |
1341 | |
1342 | /* Initialize read operation */ | |
54abf37e BP |
1343 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1344 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
d9df937a | 1345 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1346 | idetape_flush_tape_buffers(drive); |
1347 | } | |
077e3bdb | 1348 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1349 | printk(KERN_ERR "ide-tape: merge_bh_size should be" |
5a04cfa9 | 1350 | " 0 now\n"); |
01a63aeb | 1351 | tape->merge_bh_size = 0; |
1da177e4 | 1352 | } |
077e3bdb BP |
1353 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1354 | if (!tape->merge_bh) | |
1da177e4 | 1355 | return -ENOMEM; |
54abf37e | 1356 | tape->chrdev_dir = IDETAPE_DIR_READ; |
1da177e4 LT |
1357 | |
1358 | /* | |
3c98bf34 BP |
1359 | * Issue a read 0 command to ensure that DSC handshake is |
1360 | * switched from completion mode to buffer available mode. | |
1361 | * No point in issuing this if DSC overlap isn't supported, some | |
1362 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1363 | */ |
1364 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1365 | bytes_read = idetape_queue_rw_tail(drive, |
1366 | REQ_IDETAPE_READ, 0, | |
077e3bdb | 1367 | tape->merge_bh); |
1da177e4 | 1368 | if (bytes_read < 0) { |
077e3bdb BP |
1369 | ide_tape_kfree_buffer(tape); |
1370 | tape->merge_bh = NULL; | |
54abf37e | 1371 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1372 | return bytes_read; |
1373 | } | |
1374 | } | |
1375 | } | |
5e69bd95 | 1376 | |
1da177e4 LT |
1377 | return 0; |
1378 | } | |
1379 | ||
5bd50dc6 | 1380 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1381 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1382 | { |
1383 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1384 | |
8004a8c9 | 1385 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1386 | |
3c98bf34 | 1387 | /* If we are at a filemark, return a read length of 0 */ |
f2e3ab52 | 1388 | if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 LT |
1389 | return 0; |
1390 | ||
83042b24 | 1391 | idetape_init_read(drive); |
5e69bd95 | 1392 | |
5e69bd95 | 1393 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
077e3bdb | 1394 | tape->merge_bh); |
1da177e4 LT |
1395 | } |
1396 | ||
5a04cfa9 | 1397 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1398 | { |
1399 | idetape_tape_t *tape = drive->driver_data; | |
1400 | struct idetape_bh *bh; | |
1401 | int blocks; | |
3c98bf34 | 1402 | |
1da177e4 LT |
1403 | while (bcount) { |
1404 | unsigned int count; | |
1405 | ||
077e3bdb | 1406 | bh = tape->merge_bh; |
f73850a3 | 1407 | count = min(tape->buffer_size, bcount); |
1da177e4 | 1408 | bcount -= count; |
54bb2074 | 1409 | blocks = count / tape->blk_size; |
1da177e4 | 1410 | while (count) { |
5a04cfa9 BP |
1411 | atomic_set(&bh->b_count, |
1412 | min(count, (unsigned int)bh->b_size)); | |
1da177e4 LT |
1413 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
1414 | count -= atomic_read(&bh->b_count); | |
1415 | bh = bh->b_reqnext; | |
1416 | } | |
5a04cfa9 | 1417 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
077e3bdb | 1418 | tape->merge_bh); |
1da177e4 LT |
1419 | } |
1420 | } | |
1421 | ||
1da177e4 | 1422 | /* |
3c98bf34 BP |
1423 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1424 | * currently support only one partition. | |
1425 | */ | |
5a04cfa9 | 1426 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 | 1427 | { |
2ac07d92 BZ |
1428 | struct ide_tape_obj *tape = drive->driver_data; |
1429 | struct gendisk *disk = tape->disk; | |
1da177e4 | 1430 | int retval; |
d236d74c | 1431 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1432 | |
1433 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1434 | ||
1da177e4 | 1435 | idetape_create_rewind_cmd(drive, &pc); |
2ac07d92 | 1436 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1437 | if (retval) |
1438 | return retval; | |
1439 | ||
1440 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1441 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1442 | if (retval) |
1443 | return retval; | |
1444 | return 0; | |
1445 | } | |
1446 | ||
3c98bf34 | 1447 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1448 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1449 | unsigned long arg) | |
1da177e4 LT |
1450 | { |
1451 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1452 | void __user *argp = (void __user *)arg; |
1453 | ||
d59823fa BP |
1454 | struct idetape_config { |
1455 | int dsc_rw_frequency; | |
1456 | int dsc_media_access_frequency; | |
1457 | int nr_stages; | |
1458 | } config; | |
1459 | ||
8004a8c9 BP |
1460 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1461 | ||
1da177e4 | 1462 | switch (cmd) { |
5a04cfa9 BP |
1463 | case 0x0340: |
1464 | if (copy_from_user(&config, argp, sizeof(config))) | |
1465 | return -EFAULT; | |
1466 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1467 | break; |
1468 | case 0x0350: | |
1469 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1470 | config.nr_stages = 1; |
5a04cfa9 BP |
1471 | if (copy_to_user(argp, &config, sizeof(config))) |
1472 | return -EFAULT; | |
1473 | break; | |
1474 | default: | |
1475 | return -EIO; | |
1da177e4 LT |
1476 | } |
1477 | return 0; | |
1478 | } | |
1479 | ||
5a04cfa9 BP |
1480 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1481 | int mt_count) | |
1da177e4 LT |
1482 | { |
1483 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1484 | struct gendisk *disk = tape->disk; |
d236d74c | 1485 | struct ide_atapi_pc pc; |
5a04cfa9 | 1486 | int retval, count = 0; |
b6422013 | 1487 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1488 | |
1489 | if (mt_count == 0) | |
1490 | return 0; | |
1491 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1492 | if (!sprev) |
1da177e4 | 1493 | return -EIO; |
5a04cfa9 | 1494 | mt_count = -mt_count; |
1da177e4 LT |
1495 | } |
1496 | ||
54abf37e | 1497 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
01a63aeb | 1498 | tape->merge_bh_size = 0; |
f2e3ab52 | 1499 | if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 | 1500 | ++count; |
ec0fdb01 | 1501 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1502 | } |
1503 | ||
1da177e4 | 1504 | switch (mt_op) { |
5a04cfa9 BP |
1505 | case MTFSF: |
1506 | case MTBSF: | |
1507 | idetape_create_space_cmd(&pc, mt_count - count, | |
1508 | IDETAPE_SPACE_OVER_FILEMARK); | |
2ac07d92 | 1509 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1510 | case MTFSFM: |
1511 | case MTBSFM: | |
1512 | if (!sprev) | |
1513 | return -EIO; | |
1514 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1515 | mt_count - count); | |
1516 | if (retval) | |
1517 | return retval; | |
1518 | count = (MTBSFM == mt_op ? 1 : -1); | |
1519 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1520 | default: | |
1521 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1522 | mt_op); | |
1523 | return -EIO; | |
1da177e4 LT |
1524 | } |
1525 | } | |
1526 | ||
1da177e4 | 1527 | /* |
3c98bf34 | 1528 | * Our character device read / write functions. |
1da177e4 | 1529 | * |
3c98bf34 BP |
1530 | * The tape is optimized to maximize throughput when it is transferring an |
1531 | * integral number of the "continuous transfer limit", which is a parameter of | |
1532 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1533 | * |
3c98bf34 BP |
1534 | * As of version 1.3 of the driver, the character device provides an abstract |
1535 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1536 | * same backup/restore procedure is supported. The driver will internally | |
1537 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1538 | * between the user's block size to the recommended size will only result in a | |
1539 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1540 | * This is not applicable to Onstream. | |
1da177e4 | 1541 | */ |
5a04cfa9 BP |
1542 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1543 | size_t count, loff_t *ppos) | |
1da177e4 LT |
1544 | { |
1545 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1546 | ide_drive_t *drive = tape->drive; | |
5a04cfa9 | 1547 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 1548 | ssize_t ret = 0; |
b6422013 | 1549 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 1550 | |
8004a8c9 | 1551 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1552 | |
54abf37e | 1553 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
f2e3ab52 | 1554 | if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) |
54bb2074 BP |
1555 | if (count > tape->blk_size && |
1556 | (count % tape->blk_size) == 0) | |
1557 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1558 | } |
83042b24 | 1559 | rc = idetape_init_read(drive); |
8d06bfad | 1560 | if (rc < 0) |
1da177e4 LT |
1561 | return rc; |
1562 | if (count == 0) | |
1563 | return (0); | |
01a63aeb BP |
1564 | if (tape->merge_bh_size) { |
1565 | actually_read = min((unsigned int)(tape->merge_bh_size), | |
5a04cfa9 | 1566 | (unsigned int)count); |
99d74e61 | 1567 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
dcd96379 | 1568 | ret = -EFAULT; |
1da177e4 | 1569 | buf += actually_read; |
01a63aeb | 1570 | tape->merge_bh_size -= actually_read; |
1da177e4 LT |
1571 | count -= actually_read; |
1572 | } | |
f73850a3 | 1573 | while (count >= tape->buffer_size) { |
b6422013 | 1574 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1575 | if (bytes_read <= 0) |
1576 | goto finish; | |
99d74e61 | 1577 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
dcd96379 | 1578 | ret = -EFAULT; |
1da177e4 LT |
1579 | buf += bytes_read; |
1580 | count -= bytes_read; | |
1581 | actually_read += bytes_read; | |
1582 | } | |
1583 | if (count) { | |
b6422013 | 1584 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1585 | if (bytes_read <= 0) |
1586 | goto finish; | |
1587 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
99d74e61 | 1588 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
dcd96379 | 1589 | ret = -EFAULT; |
1da177e4 | 1590 | actually_read += temp; |
01a63aeb | 1591 | tape->merge_bh_size = bytes_read-temp; |
1da177e4 LT |
1592 | } |
1593 | finish: | |
f2e3ab52 | 1594 | if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { |
8004a8c9 BP |
1595 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1596 | ||
1da177e4 LT |
1597 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1598 | return 0; | |
1599 | } | |
dcd96379 | 1600 | |
5a04cfa9 | 1601 | return ret ? ret : actually_read; |
1da177e4 LT |
1602 | } |
1603 | ||
5a04cfa9 | 1604 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1605 | size_t count, loff_t *ppos) |
1606 | { | |
1607 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1608 | ide_drive_t *drive = tape->drive; | |
dcd96379 DW |
1609 | ssize_t actually_written = 0; |
1610 | ssize_t ret = 0; | |
b6422013 | 1611 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
1612 | |
1613 | /* The drive is write protected. */ | |
1614 | if (tape->write_prot) | |
1615 | return -EACCES; | |
1616 | ||
8004a8c9 | 1617 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1618 | |
1619 | /* Initialize write operation */ | |
54abf37e BP |
1620 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
1621 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1622 | ide_tape_discard_merge_buffer(drive, 1); |
077e3bdb | 1623 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1624 | printk(KERN_ERR "ide-tape: merge_bh_size " |
1da177e4 | 1625 | "should be 0 now\n"); |
01a63aeb | 1626 | tape->merge_bh_size = 0; |
1da177e4 | 1627 | } |
077e3bdb BP |
1628 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1629 | if (!tape->merge_bh) | |
1da177e4 | 1630 | return -ENOMEM; |
54abf37e | 1631 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
077e3bdb | 1632 | idetape_init_merge_buffer(tape); |
1da177e4 LT |
1633 | |
1634 | /* | |
3c98bf34 BP |
1635 | * Issue a write 0 command to ensure that DSC handshake is |
1636 | * switched from completion mode to buffer available mode. No | |
1637 | * point in issuing this if DSC overlap isn't supported, some | |
1638 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1639 | */ |
1640 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1641 | ssize_t retval = idetape_queue_rw_tail(drive, |
1642 | REQ_IDETAPE_WRITE, 0, | |
077e3bdb | 1643 | tape->merge_bh); |
1da177e4 | 1644 | if (retval < 0) { |
077e3bdb BP |
1645 | ide_tape_kfree_buffer(tape); |
1646 | tape->merge_bh = NULL; | |
54abf37e | 1647 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1648 | return retval; |
1649 | } | |
1650 | } | |
1651 | } | |
1652 | if (count == 0) | |
1653 | return (0); | |
01a63aeb BP |
1654 | if (tape->merge_bh_size) { |
1655 | if (tape->merge_bh_size >= tape->buffer_size) { | |
5a04cfa9 | 1656 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
01a63aeb | 1657 | tape->merge_bh_size = 0; |
1da177e4 | 1658 | } |
5a04cfa9 | 1659 | actually_written = min((unsigned int) |
01a63aeb | 1660 | (tape->buffer_size - tape->merge_bh_size), |
5a04cfa9 | 1661 | (unsigned int)count); |
8646c88f | 1662 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
dcd96379 | 1663 | ret = -EFAULT; |
1da177e4 | 1664 | buf += actually_written; |
01a63aeb | 1665 | tape->merge_bh_size += actually_written; |
1da177e4 LT |
1666 | count -= actually_written; |
1667 | ||
01a63aeb | 1668 | if (tape->merge_bh_size == tape->buffer_size) { |
dcd96379 | 1669 | ssize_t retval; |
01a63aeb | 1670 | tape->merge_bh_size = 0; |
b6422013 | 1671 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
1672 | if (retval <= 0) |
1673 | return (retval); | |
1674 | } | |
1675 | } | |
f73850a3 | 1676 | while (count >= tape->buffer_size) { |
dcd96379 | 1677 | ssize_t retval; |
f73850a3 | 1678 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
dcd96379 | 1679 | ret = -EFAULT; |
f73850a3 BP |
1680 | buf += tape->buffer_size; |
1681 | count -= tape->buffer_size; | |
b6422013 | 1682 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 1683 | actually_written += tape->buffer_size; |
1da177e4 LT |
1684 | if (retval <= 0) |
1685 | return (retval); | |
1686 | } | |
1687 | if (count) { | |
1688 | actually_written += count; | |
8646c88f | 1689 | if (idetape_copy_stage_from_user(tape, buf, count)) |
dcd96379 | 1690 | ret = -EFAULT; |
01a63aeb | 1691 | tape->merge_bh_size += count; |
1da177e4 | 1692 | } |
5a04cfa9 | 1693 | return ret ? ret : actually_written; |
1da177e4 LT |
1694 | } |
1695 | ||
5a04cfa9 | 1696 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1697 | { |
2ac07d92 | 1698 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1699 | struct ide_atapi_pc pc; |
1da177e4 LT |
1700 | |
1701 | /* Write a filemark */ | |
1702 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
2ac07d92 | 1703 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
1da177e4 LT |
1704 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
1705 | return -EIO; | |
1706 | } | |
1707 | return 0; | |
1708 | } | |
1709 | ||
1710 | /* | |
d99c9da2 BP |
1711 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1712 | * requested. | |
1da177e4 | 1713 | * |
d99c9da2 BP |
1714 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1715 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1716 | * usually not supported. |
1da177e4 | 1717 | * |
d99c9da2 | 1718 | * The following commands are currently not supported: |
1da177e4 | 1719 | * |
d99c9da2 BP |
1720 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1721 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1722 | */ |
d99c9da2 | 1723 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1724 | { |
1725 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1726 | struct gendisk *disk = tape->disk; |
d236d74c | 1727 | struct ide_atapi_pc pc; |
5a04cfa9 | 1728 | int i, retval; |
1da177e4 | 1729 | |
8004a8c9 BP |
1730 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
1731 | mt_op, mt_count); | |
5a04cfa9 | 1732 | |
1da177e4 | 1733 | switch (mt_op) { |
5a04cfa9 BP |
1734 | case MTFSF: |
1735 | case MTFSFM: | |
1736 | case MTBSF: | |
1737 | case MTBSFM: | |
1738 | if (!mt_count) | |
1739 | return 0; | |
1740 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1741 | default: | |
1742 | break; | |
1da177e4 | 1743 | } |
5a04cfa9 | 1744 | |
1da177e4 | 1745 | switch (mt_op) { |
5a04cfa9 BP |
1746 | case MTWEOF: |
1747 | if (tape->write_prot) | |
1748 | return -EACCES; | |
ec0fdb01 | 1749 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1750 | for (i = 0; i < mt_count; i++) { |
1751 | retval = idetape_write_filemark(drive); | |
1752 | if (retval) | |
1753 | return retval; | |
1754 | } | |
1755 | return 0; | |
1756 | case MTREW: | |
ec0fdb01 | 1757 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1758 | if (idetape_rewind_tape(drive)) |
1759 | return -EIO; | |
1760 | return 0; | |
1761 | case MTLOAD: | |
ec0fdb01 | 1762 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1763 | return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1764 | case MTUNLOAD: |
1765 | case MTOFFL: | |
1766 | /* | |
1767 | * If door is locked, attempt to unlock before | |
1768 | * attempting to eject. | |
1769 | */ | |
1770 | if (tape->door_locked) { | |
0578042d | 1771 | if (!ide_set_media_lock(drive, disk, 0)) |
385a4b87 | 1772 | tape->door_locked = DOOR_UNLOCKED; |
5a04cfa9 | 1773 | } |
ec0fdb01 | 1774 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1775 | retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); |
5a04cfa9 | 1776 | if (!retval) |
f2e3ab52 | 1777 | clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
5a04cfa9 BP |
1778 | return retval; |
1779 | case MTNOP: | |
ec0fdb01 | 1780 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1781 | return idetape_flush_tape_buffers(drive); |
1782 | case MTRETEN: | |
ec0fdb01 | 1783 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1784 | return ide_do_start_stop(drive, disk, |
5a04cfa9 | 1785 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1786 | case MTEOM: |
1787 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
2ac07d92 | 1788 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1789 | case MTERASE: |
1790 | (void)idetape_rewind_tape(drive); | |
1791 | idetape_create_erase_cmd(&pc); | |
2ac07d92 | 1792 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1793 | case MTSETBLK: |
1794 | if (mt_count) { | |
1795 | if (mt_count < tape->blk_size || | |
1796 | mt_count % tape->blk_size) | |
1da177e4 | 1797 | return -EIO; |
5a04cfa9 | 1798 | tape->user_bs_factor = mt_count / tape->blk_size; |
f2e3ab52 | 1799 | clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 | 1800 | } else |
f2e3ab52 | 1801 | set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 BP |
1802 | return 0; |
1803 | case MTSEEK: | |
ec0fdb01 | 1804 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1805 | return idetape_position_tape(drive, |
1806 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1807 | case MTSETPART: | |
ec0fdb01 | 1808 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1809 | return idetape_position_tape(drive, 0, mt_count, 0); |
1810 | case MTFSR: | |
1811 | case MTBSR: | |
1812 | case MTLOCK: | |
0578042d | 1813 | retval = ide_set_media_lock(drive, disk, 1); |
5a04cfa9 | 1814 | if (retval) |
1da177e4 | 1815 | return retval; |
5a04cfa9 BP |
1816 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1817 | return 0; | |
1818 | case MTUNLOCK: | |
0578042d | 1819 | retval = ide_set_media_lock(drive, disk, 0); |
5a04cfa9 BP |
1820 | if (retval) |
1821 | return retval; | |
1822 | tape->door_locked = DOOR_UNLOCKED; | |
1823 | return 0; | |
1824 | default: | |
1825 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1826 | mt_op); | |
1827 | return -EIO; | |
1da177e4 LT |
1828 | } |
1829 | } | |
1830 | ||
1831 | /* | |
d99c9da2 BP |
1832 | * Our character device ioctls. General mtio.h magnetic io commands are |
1833 | * supported here, and not in the corresponding block interface. Our own | |
1834 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 1835 | */ |
d99c9da2 BP |
1836 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
1837 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
1838 | { |
1839 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1840 | ide_drive_t *drive = tape->drive; | |
1841 | struct mtop mtop; | |
1842 | struct mtget mtget; | |
1843 | struct mtpos mtpos; | |
54bb2074 | 1844 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
1845 | void __user *argp = (void __user *)arg; |
1846 | ||
8004a8c9 | 1847 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 1848 | |
54abf37e | 1849 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 1850 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1851 | idetape_flush_tape_buffers(drive); |
1852 | } | |
1853 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
01a63aeb | 1854 | block_offset = tape->merge_bh_size / |
54bb2074 | 1855 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
1856 | position = idetape_read_position(drive); |
1857 | if (position < 0) | |
1da177e4 LT |
1858 | return -EIO; |
1859 | } | |
1860 | switch (cmd) { | |
5a04cfa9 BP |
1861 | case MTIOCTOP: |
1862 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
1863 | return -EFAULT; | |
1864 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
1865 | case MTIOCGET: | |
1866 | memset(&mtget, 0, sizeof(struct mtget)); | |
1867 | mtget.mt_type = MT_ISSCSI2; | |
1868 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1869 | mtget.mt_dsreg = | |
1870 | ((tape->blk_size * tape->user_bs_factor) | |
1871 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
1872 | ||
1873 | if (tape->drv_write_prot) | |
1874 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
1875 | ||
1876 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
1877 | return -EFAULT; | |
1878 | return 0; | |
1879 | case MTIOCPOS: | |
1880 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1881 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
1882 | return -EFAULT; | |
1883 | return 0; | |
1884 | default: | |
1885 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1886 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 1887 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
1888 | } |
1889 | } | |
1890 | ||
3cffb9ce BP |
1891 | /* |
1892 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
1893 | * block size with the reported value. | |
1894 | */ | |
1895 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
1896 | { | |
1897 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1898 | struct ide_atapi_pc pc; |
3cffb9ce BP |
1899 | |
1900 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2ac07d92 | 1901 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
3cffb9ce | 1902 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
54bb2074 | 1903 | if (tape->blk_size == 0) { |
3cffb9ce BP |
1904 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
1905 | "block size, assuming 32k\n"); | |
54bb2074 | 1906 | tape->blk_size = 32768; |
3cffb9ce BP |
1907 | } |
1908 | return; | |
1909 | } | |
d236d74c BP |
1910 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
1911 | (pc.buf[4 + 6] << 8) + | |
1912 | pc.buf[4 + 7]; | |
1913 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 1914 | } |
1da177e4 | 1915 | |
5a04cfa9 | 1916 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
1917 | { |
1918 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
1919 | ide_drive_t *drive; | |
1920 | idetape_tape_t *tape; | |
1da177e4 LT |
1921 | int retval; |
1922 | ||
8004a8c9 BP |
1923 | if (i >= MAX_HWIFS * MAX_DRIVES) |
1924 | return -ENXIO; | |
1925 | ||
04f4ac9d | 1926 | lock_kernel(); |
8004a8c9 | 1927 | tape = ide_tape_chrdev_get(i); |
04f4ac9d JC |
1928 | if (!tape) { |
1929 | unlock_kernel(); | |
8004a8c9 | 1930 | return -ENXIO; |
04f4ac9d | 1931 | } |
8004a8c9 BP |
1932 | |
1933 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1934 | ||
1da177e4 LT |
1935 | /* |
1936 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1937 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1938 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1939 | */ | |
1940 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1941 | ||
1da177e4 LT |
1942 | drive = tape->drive; |
1943 | ||
1944 | filp->private_data = tape; | |
1945 | ||
f2e3ab52 | 1946 | if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { |
1da177e4 LT |
1947 | retval = -EBUSY; |
1948 | goto out_put_tape; | |
1949 | } | |
1950 | ||
1951 | retval = idetape_wait_ready(drive, 60 * HZ); | |
1952 | if (retval) { | |
f2e3ab52 | 1953 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1954 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
1955 | goto out_put_tape; | |
1956 | } | |
1957 | ||
1958 | idetape_read_position(drive); | |
f2e3ab52 | 1959 | if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) |
1da177e4 LT |
1960 | (void)idetape_rewind_tape(drive); |
1961 | ||
1da177e4 | 1962 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 1963 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
1964 | |
1965 | /* Set write protect flag if device is opened as read-only. */ | |
1966 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
1967 | tape->write_prot = 1; | |
1968 | else | |
1969 | tape->write_prot = tape->drv_write_prot; | |
1970 | ||
1971 | /* Make sure drive isn't write protected if user wants to write. */ | |
1972 | if (tape->write_prot) { | |
1973 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
1974 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
f2e3ab52 | 1975 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1976 | retval = -EROFS; |
1977 | goto out_put_tape; | |
1978 | } | |
1979 | } | |
1980 | ||
3c98bf34 | 1981 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 1982 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
0578042d | 1983 | if (!ide_set_media_lock(drive, tape->disk, 1)) { |
385a4b87 BZ |
1984 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
1985 | tape->door_locked = DOOR_LOCKED; | |
1da177e4 LT |
1986 | } |
1987 | } | |
04f4ac9d | 1988 | unlock_kernel(); |
1da177e4 LT |
1989 | return 0; |
1990 | ||
1991 | out_put_tape: | |
1992 | ide_tape_put(tape); | |
04f4ac9d | 1993 | unlock_kernel(); |
1da177e4 LT |
1994 | return retval; |
1995 | } | |
1996 | ||
5a04cfa9 | 1997 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
1998 | { |
1999 | idetape_tape_t *tape = drive->driver_data; | |
2000 | ||
d9df937a | 2001 | ide_tape_flush_merge_buffer(drive); |
077e3bdb BP |
2002 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); |
2003 | if (tape->merge_bh != NULL) { | |
54bb2074 BP |
2004 | idetape_pad_zeros(drive, tape->blk_size * |
2005 | (tape->user_bs_factor - 1)); | |
077e3bdb BP |
2006 | ide_tape_kfree_buffer(tape); |
2007 | tape->merge_bh = NULL; | |
1da177e4 LT |
2008 | } |
2009 | idetape_write_filemark(drive); | |
2010 | idetape_flush_tape_buffers(drive); | |
2011 | idetape_flush_tape_buffers(drive); | |
2012 | } | |
2013 | ||
5a04cfa9 | 2014 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 LT |
2015 | { |
2016 | struct ide_tape_obj *tape = ide_tape_f(filp); | |
2017 | ide_drive_t *drive = tape->drive; | |
1da177e4 LT |
2018 | unsigned int minor = iminor(inode); |
2019 | ||
2020 | lock_kernel(); | |
2021 | tape = drive->driver_data; | |
8004a8c9 BP |
2022 | |
2023 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 2024 | |
54abf37e | 2025 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 2026 | idetape_write_release(drive, minor); |
54abf37e | 2027 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 2028 | if (minor < 128) |
ec0fdb01 | 2029 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 2030 | } |
f64eee7b | 2031 | |
f2e3ab52 | 2032 | if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) |
1da177e4 | 2033 | (void) idetape_rewind_tape(drive); |
54abf37e | 2034 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 | 2035 | if (tape->door_locked == DOOR_LOCKED) { |
0578042d | 2036 | if (!ide_set_media_lock(drive, tape->disk, 0)) |
385a4b87 | 2037 | tape->door_locked = DOOR_UNLOCKED; |
1da177e4 LT |
2038 | } |
2039 | } | |
f2e3ab52 | 2040 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2041 | ide_tape_put(tape); |
2042 | unlock_kernel(); | |
2043 | return 0; | |
2044 | } | |
2045 | ||
6d29c8f0 | 2046 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 2047 | { |
1da177e4 | 2048 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 2049 | struct ide_atapi_pc pc; |
801bd32e | 2050 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 2051 | |
1da177e4 | 2052 | idetape_create_inquiry_cmd(&pc); |
2ac07d92 | 2053 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
6d29c8f0 BP |
2054 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
2055 | tape->name); | |
1da177e4 LT |
2056 | return; |
2057 | } | |
d236d74c BP |
2058 | memcpy(vendor_id, &pc.buf[8], 8); |
2059 | memcpy(product_id, &pc.buf[16], 16); | |
2060 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 | 2061 | |
801bd32e BP |
2062 | ide_fixstring(vendor_id, 8, 0); |
2063 | ide_fixstring(product_id, 16, 0); | |
2064 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 2065 | |
801bd32e | 2066 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 2067 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
2068 | } |
2069 | ||
2070 | /* | |
b6422013 BP |
2071 | * Ask the tape about its various parameters. In particular, we will adjust our |
2072 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 2073 | */ |
5a04cfa9 | 2074 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
2075 | { |
2076 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2077 | struct ide_atapi_pc pc; |
b6422013 BP |
2078 | u8 *caps; |
2079 | u8 speed, max_speed; | |
47314fa4 | 2080 | |
1da177e4 | 2081 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2ac07d92 | 2082 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
b6422013 BP |
2083 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
2084 | " some default values\n"); | |
54bb2074 | 2085 | tape->blk_size = 512; |
b6422013 BP |
2086 | put_unaligned(52, (u16 *)&tape->caps[12]); |
2087 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2088 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
2089 | return; |
2090 | } | |
d236d74c | 2091 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
2092 | |
2093 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
2094 | speed = be16_to_cpup((__be16 *)&caps[14]); |
2095 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 2096 | |
cd740ab0 HH |
2097 | *(u16 *)&caps[8] = max_speed; |
2098 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
2099 | *(u16 *)&caps[14] = speed; | |
2100 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 2101 | |
b6422013 BP |
2102 | if (!speed) { |
2103 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2104 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2105 | *(u16 *)&caps[14] = 650; |
1da177e4 | 2106 | } |
b6422013 BP |
2107 | if (!max_speed) { |
2108 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2109 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2110 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
2111 | } |
2112 | ||
b6422013 | 2113 | memcpy(&tape->caps, caps, 20); |
0578042d BZ |
2114 | |
2115 | /* device lacks locking support according to capabilities page */ | |
2116 | if ((caps[6] & 1) == 0) | |
2117 | drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK; | |
2118 | ||
b6422013 | 2119 | if (caps[7] & 0x02) |
54bb2074 | 2120 | tape->blk_size = 512; |
b6422013 | 2121 | else if (caps[7] & 0x04) |
54bb2074 | 2122 | tape->blk_size = 1024; |
1da177e4 LT |
2123 | } |
2124 | ||
7662d046 | 2125 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
2126 | #define ide_tape_devset_get(name, field) \ |
2127 | static int get_##name(ide_drive_t *drive) \ | |
2128 | { \ | |
2129 | idetape_tape_t *tape = drive->driver_data; \ | |
2130 | return tape->field; \ | |
2131 | } | |
2132 | ||
2133 | #define ide_tape_devset_set(name, field) \ | |
2134 | static int set_##name(ide_drive_t *drive, int arg) \ | |
2135 | { \ | |
2136 | idetape_tape_t *tape = drive->driver_data; \ | |
2137 | tape->field = arg; \ | |
2138 | return 0; \ | |
2139 | } | |
2140 | ||
92f1f8fd | 2141 | #define ide_tape_devset_rw_field(_name, _field) \ |
8185d5aa BZ |
2142 | ide_tape_devset_get(_name, _field) \ |
2143 | ide_tape_devset_set(_name, _field) \ | |
92f1f8fd | 2144 | IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) |
8185d5aa | 2145 | |
92f1f8fd | 2146 | #define ide_tape_devset_r_field(_name, _field) \ |
8185d5aa | 2147 | ide_tape_devset_get(_name, _field) \ |
92f1f8fd | 2148 | IDE_DEVSET(_name, 0, get_##_name, NULL) |
8185d5aa BZ |
2149 | |
2150 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
2151 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
2152 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
2153 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
2154 | ||
92f1f8fd EO |
2155 | ide_devset_rw_field(dsc_overlap, dsc_overlap); |
2156 | ||
2157 | ide_tape_devset_rw_field(debug_mask, debug_mask); | |
2158 | ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); | |
2159 | ||
2160 | ide_tape_devset_r_field(avg_speed, avg_speed); | |
2161 | ide_tape_devset_r_field(speed, caps[14]); | |
2162 | ide_tape_devset_r_field(buffer, caps[16]); | |
2163 | ide_tape_devset_r_field(buffer_size, buffer_size); | |
2164 | ||
2165 | static const struct ide_proc_devset idetape_settings[] = { | |
2166 | __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), | |
2167 | __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), | |
2168 | __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), | |
2169 | __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), | |
2170 | __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), | |
2171 | __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), | |
2172 | __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
2173 | mulf_tdsc, divf_tdsc), | |
2174 | { 0 }, | |
8185d5aa | 2175 | }; |
7662d046 | 2176 | #endif |
1da177e4 LT |
2177 | |
2178 | /* | |
3c98bf34 | 2179 | * The function below is called to: |
1da177e4 | 2180 | * |
3c98bf34 BP |
2181 | * 1. Initialize our various state variables. |
2182 | * 2. Ask the tape for its capabilities. | |
2183 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2184 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 2185 | * |
3c98bf34 BP |
2186 | * Note that at this point ide.c already assigned us an irq, so that we can |
2187 | * queue requests here and wait for their completion. | |
1da177e4 | 2188 | */ |
5a04cfa9 | 2189 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 2190 | { |
83042b24 | 2191 | unsigned long t; |
1da177e4 | 2192 | int speed; |
f73850a3 | 2193 | int buffer_size; |
71071b8e | 2194 | u8 gcw[2]; |
b6422013 | 2195 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 2196 | |
85e39035 BZ |
2197 | drive->pc_callback = ide_tape_callback; |
2198 | drive->pc_update_buffers = idetape_update_buffers; | |
2199 | drive->pc_io_buffers = ide_tape_io_buffers; | |
776bb027 | 2200 | |
54bb2074 | 2201 | spin_lock_init(&tape->lock); |
1da177e4 | 2202 | drive->dsc_overlap = 1; |
4166c199 BZ |
2203 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
2204 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2205 | tape->name); | |
2206 | drive->dsc_overlap = 0; | |
1da177e4 | 2207 | } |
1da177e4 | 2208 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 2209 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
1da177e4 LT |
2210 | drive->dsc_overlap = 0; |
2211 | tape->minor = minor; | |
2212 | tape->name[0] = 'h'; | |
2213 | tape->name[1] = 't'; | |
2214 | tape->name[2] = '0' + minor; | |
54abf37e | 2215 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
4dde4492 BZ |
2216 | |
2217 | *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG]; | |
71071b8e BP |
2218 | |
2219 | /* Command packet DRQ type */ | |
2220 | if (((gcw[0] & 0x60) >> 5) == 1) | |
f2e3ab52 | 2221 | set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags); |
1da177e4 | 2222 | |
1da177e4 LT |
2223 | idetape_get_inquiry_results(drive); |
2224 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 2225 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 2226 | tape->user_bs_factor = 1; |
f73850a3 BP |
2227 | tape->buffer_size = *ctl * tape->blk_size; |
2228 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 2229 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 2230 | *ctl /= 2; |
f73850a3 | 2231 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 2232 | } |
f73850a3 | 2233 | buffer_size = tape->buffer_size; |
a997a435 | 2234 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
f73850a3 | 2235 | if (buffer_size % PAGE_SIZE) { |
a997a435 | 2236 | tape->pages_per_buffer++; |
f73850a3 | 2237 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
1da177e4 LT |
2238 | } |
2239 | ||
83042b24 | 2240 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 2241 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 2242 | |
f73850a3 | 2243 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
2244 | |
2245 | /* | |
3c98bf34 BP |
2246 | * Ensure that the number we got makes sense; limit it within |
2247 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 2248 | */ |
a792bd5a HH |
2249 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
2250 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 2251 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 2252 | "%lums tDSC%s\n", |
b6422013 | 2253 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
2254 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
2255 | tape->buffer_size / 1024, | |
54bb2074 | 2256 | tape->best_dsc_rw_freq * 1000 / HZ, |
1da177e4 LT |
2257 | drive->using_dma ? ", DMA":""); |
2258 | ||
1e874f44 | 2259 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
2260 | } |
2261 | ||
4031bbe4 | 2262 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
2263 | { |
2264 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 2265 | |
7662d046 | 2266 | ide_proc_unregister_driver(drive, tape->driver); |
1da177e4 LT |
2267 | |
2268 | ide_unregister_region(tape->disk); | |
2269 | ||
2270 | ide_tape_put(tape); | |
1da177e4 LT |
2271 | } |
2272 | ||
2273 | static void ide_tape_release(struct kref *kref) | |
2274 | { | |
2275 | struct ide_tape_obj *tape = to_ide_tape(kref); | |
2276 | ide_drive_t *drive = tape->drive; | |
2277 | struct gendisk *g = tape->disk; | |
2278 | ||
01a63aeb | 2279 | BUG_ON(tape->merge_bh_size); |
8604affd | 2280 | |
1da177e4 LT |
2281 | drive->dsc_overlap = 0; |
2282 | drive->driver_data = NULL; | |
dbc1272e | 2283 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
2284 | device_destroy(idetape_sysfs_class, |
2285 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
2286 | idetape_devs[tape->minor] = NULL; |
2287 | g->private_data = NULL; | |
2288 | put_disk(g); | |
2289 | kfree(tape); | |
2290 | } | |
2291 | ||
ecfd80e4 | 2292 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
2293 | static int proc_idetape_read_name |
2294 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2295 | { | |
2296 | ide_drive_t *drive = (ide_drive_t *) data; | |
2297 | idetape_tape_t *tape = drive->driver_data; | |
2298 | char *out = page; | |
2299 | int len; | |
2300 | ||
2301 | len = sprintf(out, "%s\n", tape->name); | |
2302 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2303 | } | |
2304 | ||
2305 | static ide_proc_entry_t idetape_proc[] = { | |
2306 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2307 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2308 | { NULL, 0, NULL, NULL } | |
2309 | }; | |
1da177e4 LT |
2310 | #endif |
2311 | ||
4031bbe4 | 2312 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 2313 | |
1da177e4 | 2314 | static ide_driver_t idetape_driver = { |
8604affd | 2315 | .gen_driver = { |
4ef3b8f4 | 2316 | .owner = THIS_MODULE, |
8604affd BZ |
2317 | .name = "ide-tape", |
2318 | .bus = &ide_bus_type, | |
8604affd | 2319 | }, |
4031bbe4 RK |
2320 | .probe = ide_tape_probe, |
2321 | .remove = ide_tape_remove, | |
1da177e4 LT |
2322 | .version = IDETAPE_VERSION, |
2323 | .media = ide_tape, | |
1da177e4 LT |
2324 | .do_request = idetape_do_request, |
2325 | .end_request = idetape_end_request, | |
2326 | .error = __ide_error, | |
7662d046 | 2327 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 | 2328 | .proc = idetape_proc, |
8185d5aa | 2329 | .settings = idetape_settings, |
7662d046 | 2330 | #endif |
1da177e4 LT |
2331 | }; |
2332 | ||
3c98bf34 | 2333 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 2334 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
2335 | .owner = THIS_MODULE, |
2336 | .read = idetape_chrdev_read, | |
2337 | .write = idetape_chrdev_write, | |
2338 | .ioctl = idetape_chrdev_ioctl, | |
2339 | .open = idetape_chrdev_open, | |
2340 | .release = idetape_chrdev_release, | |
2341 | }; | |
2342 | ||
2343 | static int idetape_open(struct inode *inode, struct file *filp) | |
2344 | { | |
2345 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2346 | struct ide_tape_obj *tape; | |
1da177e4 | 2347 | |
5a04cfa9 BP |
2348 | tape = ide_tape_get(disk); |
2349 | if (!tape) | |
1da177e4 LT |
2350 | return -ENXIO; |
2351 | ||
1da177e4 LT |
2352 | return 0; |
2353 | } | |
2354 | ||
2355 | static int idetape_release(struct inode *inode, struct file *filp) | |
2356 | { | |
2357 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2358 | struct ide_tape_obj *tape = ide_tape_g(disk); | |
1da177e4 LT |
2359 | |
2360 | ide_tape_put(tape); | |
2361 | ||
2362 | return 0; | |
2363 | } | |
2364 | ||
2365 | static int idetape_ioctl(struct inode *inode, struct file *file, | |
2366 | unsigned int cmd, unsigned long arg) | |
2367 | { | |
2368 | struct block_device *bdev = inode->i_bdev; | |
2369 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); | |
2370 | ide_drive_t *drive = tape->drive; | |
2371 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); | |
2372 | if (err == -EINVAL) | |
2373 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2374 | return err; | |
2375 | } | |
2376 | ||
2377 | static struct block_device_operations idetape_block_ops = { | |
2378 | .owner = THIS_MODULE, | |
2379 | .open = idetape_open, | |
2380 | .release = idetape_release, | |
2381 | .ioctl = idetape_ioctl, | |
2382 | }; | |
2383 | ||
4031bbe4 | 2384 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2385 | { |
2386 | idetape_tape_t *tape; | |
2387 | struct gendisk *g; | |
2388 | int minor; | |
2389 | ||
2390 | if (!strstr("ide-tape", drive->driver_req)) | |
2391 | goto failed; | |
2a924662 | 2392 | |
1da177e4 LT |
2393 | if (drive->media != ide_tape) |
2394 | goto failed; | |
2a924662 | 2395 | |
51509eec | 2396 | if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) { |
5a04cfa9 BP |
2397 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
2398 | " the driver\n", drive->name); | |
1da177e4 LT |
2399 | goto failed; |
2400 | } | |
5a04cfa9 | 2401 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2402 | if (tape == NULL) { |
5a04cfa9 BP |
2403 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2404 | drive->name); | |
1da177e4 LT |
2405 | goto failed; |
2406 | } | |
2407 | ||
2408 | g = alloc_disk(1 << PARTN_BITS); | |
2409 | if (!g) | |
2410 | goto out_free_tape; | |
2411 | ||
2412 | ide_init_disk(g, drive); | |
2413 | ||
1da177e4 LT |
2414 | kref_init(&tape->kref); |
2415 | ||
2416 | tape->drive = drive; | |
2417 | tape->driver = &idetape_driver; | |
2418 | tape->disk = g; | |
2419 | ||
2420 | g->private_data = &tape->driver; | |
2421 | ||
2422 | drive->driver_data = tape; | |
2423 | ||
cf8b8975 | 2424 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2425 | for (minor = 0; idetape_devs[minor]; minor++) |
2426 | ; | |
2427 | idetape_devs[minor] = tape; | |
cf8b8975 | 2428 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2429 | |
2430 | idetape_setup(drive, tape, minor); | |
2431 | ||
6ecaaf94 GKH |
2432 | device_create_drvdata(idetape_sysfs_class, &drive->gendev, |
2433 | MKDEV(IDETAPE_MAJOR, minor), NULL, | |
2434 | "%s", tape->name); | |
2435 | device_create_drvdata(idetape_sysfs_class, &drive->gendev, | |
2436 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
2437 | "n%s", tape->name); | |
d5dee80a | 2438 | |
1da177e4 LT |
2439 | g->fops = &idetape_block_ops; |
2440 | ide_register_region(g); | |
2441 | ||
2442 | return 0; | |
8604affd | 2443 | |
1da177e4 LT |
2444 | out_free_tape: |
2445 | kfree(tape); | |
2446 | failed: | |
8604affd | 2447 | return -ENODEV; |
1da177e4 LT |
2448 | } |
2449 | ||
5a04cfa9 | 2450 | static void __exit idetape_exit(void) |
1da177e4 | 2451 | { |
8604affd | 2452 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2453 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2454 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2455 | } | |
2456 | ||
17514e8a | 2457 | static int __init idetape_init(void) |
1da177e4 | 2458 | { |
d5dee80a WD |
2459 | int error = 1; |
2460 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2461 | if (IS_ERR(idetape_sysfs_class)) { | |
2462 | idetape_sysfs_class = NULL; | |
2463 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2464 | error = -EBUSY; | |
2465 | goto out; | |
2466 | } | |
2467 | ||
1da177e4 | 2468 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2469 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2470 | " interface\n"); | |
d5dee80a WD |
2471 | error = -EBUSY; |
2472 | goto out_free_class; | |
1da177e4 | 2473 | } |
d5dee80a WD |
2474 | |
2475 | error = driver_register(&idetape_driver.gen_driver); | |
2476 | if (error) | |
2477 | goto out_free_driver; | |
2478 | ||
2479 | return 0; | |
2480 | ||
2481 | out_free_driver: | |
2482 | driver_unregister(&idetape_driver.gen_driver); | |
2483 | out_free_class: | |
2484 | class_destroy(idetape_sysfs_class); | |
2485 | out: | |
2486 | return error; | |
1da177e4 LT |
2487 | } |
2488 | ||
263756ec | 2489 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2490 | module_init(idetape_init); |
2491 | module_exit(idetape_exit); | |
2492 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2493 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2494 | MODULE_LICENSE("GPL"); |