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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 LT |
83 | /* |
84 | * Some drives (for example, Seagate STT3401A Travan) require a very long | |
85 | * timeout, because they don't return an interrupt or clear their busy bit | |
86 | * until after the command completes (even retension commands). | |
87 | */ | |
88 | #define IDETAPE_WAIT_CMD (900*HZ) | |
89 | ||
90 | /* | |
3c98bf34 BP |
91 | * The following parameter is used to select the point in the internal tape fifo |
92 | * in which we will start to refill the buffer. Decreasing the following | |
93 | * parameter will improve the system's latency and interactive response, while | |
94 | * using a high value might improve system throughput. | |
1da177e4 | 95 | */ |
3c98bf34 | 96 | #define IDETAPE_FIFO_THRESHOLD 2 |
1da177e4 LT |
97 | |
98 | /* | |
3c98bf34 | 99 | * DSC polling parameters. |
1da177e4 | 100 | * |
3c98bf34 BP |
101 | * Polling for DSC (a single bit in the status register) is a very important |
102 | * function in ide-tape. There are two cases in which we poll for DSC: | |
1da177e4 | 103 | * |
3c98bf34 BP |
104 | * 1. Before a read/write packet command, to ensure that we can transfer data |
105 | * from/to the tape's data buffers, without causing an actual media access. | |
106 | * In case the tape is not ready yet, we take out our request from the device | |
107 | * request queue, so that ide.c could service requests from the other device | |
108 | * on the same interface in the meantime. | |
1da177e4 | 109 | * |
3c98bf34 BP |
110 | * 2. After the successful initialization of a "media access packet command", |
111 | * which is a command that can take a long time to complete (the interval can | |
112 | * range from several seconds to even an hour). Again, we postpone our request | |
113 | * in the middle to free the bus for the other device. The polling frequency | |
114 | * here should be lower than the read/write frequency since those media access | |
115 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST | |
116 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD | |
117 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). | |
1da177e4 | 118 | * |
3c98bf34 BP |
119 | * We also set a timeout for the timer, in case something goes wrong. The |
120 | * timeout should be longer then the maximum execution time of a tape operation. | |
1da177e4 | 121 | */ |
3c98bf34 BP |
122 | |
123 | /* DSC timings. */ | |
1da177e4 LT |
124 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
125 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ | |
126 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ | |
127 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ | |
128 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ | |
129 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ | |
130 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ | |
131 | ||
132 | /*************************** End of tunable parameters ***********************/ | |
133 | ||
54abf37e BP |
134 | /* tape directions */ |
135 | enum { | |
136 | IDETAPE_DIR_NONE = (1 << 0), | |
137 | IDETAPE_DIR_READ = (1 << 1), | |
138 | IDETAPE_DIR_WRITE = (1 << 2), | |
139 | }; | |
1da177e4 LT |
140 | |
141 | struct idetape_bh { | |
ab057968 | 142 | u32 b_size; |
1da177e4 LT |
143 | atomic_t b_count; |
144 | struct idetape_bh *b_reqnext; | |
145 | char *b_data; | |
146 | }; | |
147 | ||
03056b90 BP |
148 | /* Tape door status */ |
149 | #define DOOR_UNLOCKED 0 | |
150 | #define DOOR_LOCKED 1 | |
151 | #define DOOR_EXPLICITLY_LOCKED 2 | |
152 | ||
153 | /* Some defines for the SPACE command */ | |
154 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
155 | #define IDETAPE_SPACE_TO_EOD 3 | |
156 | ||
157 | /* Some defines for the LOAD UNLOAD command */ | |
158 | #define IDETAPE_LU_LOAD_MASK 1 | |
159 | #define IDETAPE_LU_RETENSION_MASK 2 | |
160 | #define IDETAPE_LU_EOT_MASK 4 | |
161 | ||
03056b90 BP |
162 | /* Error codes returned in rq->errors to the higher part of the driver. */ |
163 | #define IDETAPE_ERROR_GENERAL 101 | |
164 | #define IDETAPE_ERROR_FILEMARK 102 | |
165 | #define IDETAPE_ERROR_EOD 103 | |
166 | ||
167 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ | |
168 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
169 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
170 | ||
1da177e4 | 171 | /* |
3c98bf34 BP |
172 | * Most of our global data which we need to save even as we leave the driver due |
173 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
174 | */ |
175 | typedef struct ide_tape_obj { | |
176 | ide_drive_t *drive; | |
177 | ide_driver_t *driver; | |
178 | struct gendisk *disk; | |
179 | struct kref kref; | |
180 | ||
181 | /* | |
1da177e4 LT |
182 | * pc points to the current processed packet command. |
183 | * | |
184 | * failed_pc points to the last failed packet command, or contains | |
185 | * NULL if we do not need to retry any packet command. This is | |
186 | * required since an additional packet command is needed before the | |
187 | * retry, to get detailed information on what went wrong. | |
188 | */ | |
189 | /* Current packet command */ | |
d236d74c | 190 | struct ide_atapi_pc *pc; |
1da177e4 | 191 | /* Last failed packet command */ |
d236d74c | 192 | struct ide_atapi_pc *failed_pc; |
2e8a6f89 BZ |
193 | /* used by REQ_IDETAPE_{READ,WRITE} requests */ |
194 | struct ide_atapi_pc queued_pc; | |
394a4c21 | 195 | |
2e8a6f89 | 196 | struct ide_atapi_pc request_sense_pc; |
394a4c21 | 197 | struct request request_sense_rq; |
1da177e4 LT |
198 | |
199 | /* | |
3c98bf34 | 200 | * DSC polling variables. |
1da177e4 | 201 | * |
3c98bf34 BP |
202 | * While polling for DSC we use postponed_rq to postpone the current |
203 | * request so that ide.c will be able to service pending requests on the | |
204 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 205 | * data transfer) request in the device request queue. |
1da177e4 LT |
206 | */ |
207 | struct request *postponed_rq; | |
208 | /* The time in which we started polling for DSC */ | |
209 | unsigned long dsc_polling_start; | |
210 | /* Timer used to poll for dsc */ | |
211 | struct timer_list dsc_timer; | |
212 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
213 | unsigned long best_dsc_rw_freq; |
214 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
215 | unsigned long dsc_timeout; |
216 | ||
3c98bf34 | 217 | /* Read position information */ |
1da177e4 LT |
218 | u8 partition; |
219 | /* Current block */ | |
54bb2074 | 220 | unsigned int first_frame; |
1da177e4 | 221 | |
3c98bf34 | 222 | /* Last error information */ |
1da177e4 LT |
223 | u8 sense_key, asc, ascq; |
224 | ||
3c98bf34 | 225 | /* Character device operation */ |
1da177e4 LT |
226 | unsigned int minor; |
227 | /* device name */ | |
228 | char name[4]; | |
229 | /* Current character device data transfer direction */ | |
54abf37e | 230 | u8 chrdev_dir; |
1da177e4 | 231 | |
54bb2074 BP |
232 | /* tape block size, usually 512 or 1024 bytes */ |
233 | unsigned short blk_size; | |
1da177e4 | 234 | int user_bs_factor; |
b6422013 | 235 | |
1da177e4 | 236 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 237 | u8 caps[20]; |
1da177e4 LT |
238 | |
239 | /* | |
3c98bf34 | 240 | * Active data transfer request parameters. |
1da177e4 | 241 | * |
3c98bf34 BP |
242 | * At most, there is only one ide-tape originated data transfer request |
243 | * in the device request queue. This allows ide.c to easily service | |
244 | * requests from the other device when we postpone our active request. | |
1da177e4 | 245 | */ |
83042b24 | 246 | |
3c98bf34 | 247 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 248 | int buffer_size; |
077e3bdb BP |
249 | /* merge buffer */ |
250 | struct idetape_bh *merge_bh; | |
01a63aeb BP |
251 | /* size of the merge buffer */ |
252 | int merge_bh_size; | |
077e3bdb | 253 | /* pointer to current buffer head within the merge buffer */ |
1da177e4 LT |
254 | struct idetape_bh *bh; |
255 | char *b_data; | |
256 | int b_count; | |
3c98bf34 | 257 | |
a997a435 | 258 | int pages_per_buffer; |
1da177e4 LT |
259 | /* Wasted space in each stage */ |
260 | int excess_bh_size; | |
261 | ||
1da177e4 | 262 | /* protects the ide-tape queue */ |
54bb2074 | 263 | spinlock_t lock; |
1da177e4 | 264 | |
3c98bf34 | 265 | /* Measures average tape speed */ |
1da177e4 LT |
266 | unsigned long avg_time; |
267 | int avg_size; | |
268 | int avg_speed; | |
269 | ||
1da177e4 LT |
270 | /* the door is currently locked */ |
271 | int door_locked; | |
272 | /* the tape hardware is write protected */ | |
273 | char drv_write_prot; | |
274 | /* the tape is write protected (hardware or opened as read-only) */ | |
275 | char write_prot; | |
276 | ||
8004a8c9 | 277 | u32 debug_mask; |
1da177e4 LT |
278 | } idetape_tape_t; |
279 | ||
cf8b8975 | 280 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 281 | |
d5dee80a WD |
282 | static struct class *idetape_sysfs_class; |
283 | ||
1da177e4 LT |
284 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
285 | ||
286 | #define ide_tape_g(disk) \ | |
287 | container_of((disk)->private_data, struct ide_tape_obj, driver) | |
288 | ||
08da591e BZ |
289 | static void ide_tape_release(struct kref *); |
290 | ||
1da177e4 LT |
291 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
292 | { | |
293 | struct ide_tape_obj *tape = NULL; | |
294 | ||
cf8b8975 | 295 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 296 | tape = ide_tape_g(disk); |
08da591e | 297 | if (tape) { |
d3e33ff5 | 298 | if (ide_device_get(tape->drive)) |
08da591e | 299 | tape = NULL; |
d3e33ff5 BZ |
300 | else |
301 | kref_get(&tape->kref); | |
08da591e | 302 | } |
cf8b8975 | 303 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
304 | return tape; |
305 | } | |
306 | ||
1da177e4 LT |
307 | static void ide_tape_put(struct ide_tape_obj *tape) |
308 | { | |
d3e33ff5 BZ |
309 | ide_drive_t *drive = tape->drive; |
310 | ||
cf8b8975 | 311 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 312 | kref_put(&tape->kref, ide_tape_release); |
d3e33ff5 | 313 | ide_device_put(drive); |
cf8b8975 | 314 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
315 | } |
316 | ||
1da177e4 | 317 | /* |
3c98bf34 BP |
318 | * The variables below are used for the character device interface. Additional |
319 | * state variables are defined in our ide_drive_t structure. | |
1da177e4 | 320 | */ |
5a04cfa9 | 321 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
1da177e4 LT |
322 | |
323 | #define ide_tape_f(file) ((file)->private_data) | |
324 | ||
325 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) | |
326 | { | |
327 | struct ide_tape_obj *tape = NULL; | |
328 | ||
cf8b8975 | 329 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
330 | tape = idetape_devs[i]; |
331 | if (tape) | |
332 | kref_get(&tape->kref); | |
cf8b8975 | 333 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
334 | return tape; |
335 | } | |
336 | ||
d236d74c | 337 | static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 338 | unsigned int bcount) |
1da177e4 LT |
339 | { |
340 | struct idetape_bh *bh = pc->bh; | |
341 | int count; | |
342 | ||
343 | while (bcount) { | |
1da177e4 LT |
344 | if (bh == NULL) { |
345 | printk(KERN_ERR "ide-tape: bh == NULL in " | |
346 | "idetape_input_buffers\n"); | |
9f87abe8 | 347 | ide_pad_transfer(drive, 0, bcount); |
1da177e4 LT |
348 | return; |
349 | } | |
5a04cfa9 BP |
350 | count = min( |
351 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
352 | bcount); | |
374e042c | 353 | drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data + |
5a04cfa9 | 354 | atomic_read(&bh->b_count), count); |
1da177e4 LT |
355 | bcount -= count; |
356 | atomic_add(count, &bh->b_count); | |
357 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
358 | bh = bh->b_reqnext; | |
359 | if (bh) | |
360 | atomic_set(&bh->b_count, 0); | |
361 | } | |
362 | } | |
363 | pc->bh = bh; | |
364 | } | |
365 | ||
d236d74c | 366 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 367 | unsigned int bcount) |
1da177e4 LT |
368 | { |
369 | struct idetape_bh *bh = pc->bh; | |
370 | int count; | |
371 | ||
372 | while (bcount) { | |
1da177e4 | 373 | if (bh == NULL) { |
5a04cfa9 BP |
374 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
375 | __func__); | |
1da177e4 LT |
376 | return; |
377 | } | |
1da177e4 | 378 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
374e042c | 379 | drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); |
1da177e4 LT |
380 | bcount -= count; |
381 | pc->b_data += count; | |
382 | pc->b_count -= count; | |
383 | if (!pc->b_count) { | |
5a04cfa9 BP |
384 | bh = bh->b_reqnext; |
385 | pc->bh = bh; | |
1da177e4 LT |
386 | if (bh) { |
387 | pc->b_data = bh->b_data; | |
388 | pc->b_count = atomic_read(&bh->b_count); | |
389 | } | |
390 | } | |
391 | } | |
392 | } | |
393 | ||
646c0cb6 | 394 | static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
395 | { |
396 | struct idetape_bh *bh = pc->bh; | |
397 | int count; | |
d236d74c | 398 | unsigned int bcount = pc->xferred; |
1da177e4 | 399 | |
346331f8 | 400 | if (pc->flags & PC_FLAG_WRITING) |
1da177e4 LT |
401 | return; |
402 | while (bcount) { | |
1da177e4 | 403 | if (bh == NULL) { |
5a04cfa9 BP |
404 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
405 | __func__); | |
1da177e4 LT |
406 | return; |
407 | } | |
1da177e4 LT |
408 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
409 | atomic_set(&bh->b_count, count); | |
410 | if (atomic_read(&bh->b_count) == bh->b_size) | |
411 | bh = bh->b_reqnext; | |
412 | bcount -= count; | |
413 | } | |
414 | pc->bh = bh; | |
415 | } | |
416 | ||
1da177e4 | 417 | /* |
1b5db434 BP |
418 | * called on each failed packet command retry to analyze the request sense. We |
419 | * currently do not utilize this information. | |
1da177e4 | 420 | */ |
1b5db434 | 421 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
422 | { |
423 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 424 | struct ide_atapi_pc *pc = tape->failed_pc; |
1da177e4 | 425 | |
1b5db434 BP |
426 | tape->sense_key = sense[2] & 0xF; |
427 | tape->asc = sense[12]; | |
428 | tape->ascq = sense[13]; | |
8004a8c9 BP |
429 | |
430 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
431 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 432 | |
d236d74c | 433 | /* Correct pc->xferred by asking the tape. */ |
346331f8 | 434 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
d236d74c | 435 | pc->xferred = pc->req_xfer - |
54bb2074 | 436 | tape->blk_size * |
5d0cc8ae | 437 | get_unaligned_be32(&sense[3]); |
646c0cb6 | 438 | idetape_update_buffers(drive, pc); |
1da177e4 LT |
439 | } |
440 | ||
441 | /* | |
442 | * If error was the result of a zero-length read or write command, | |
443 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
444 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
445 | */ | |
90699ce2 | 446 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
447 | /* length == 0 */ |
448 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
449 | if (tape->sense_key == 5) { | |
1da177e4 LT |
450 | /* don't report an error, everything's ok */ |
451 | pc->error = 0; | |
452 | /* don't retry read/write */ | |
346331f8 | 453 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
454 | } |
455 | } | |
90699ce2 | 456 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
1da177e4 | 457 | pc->error = IDETAPE_ERROR_FILEMARK; |
346331f8 | 458 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 459 | } |
90699ce2 | 460 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
461 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
462 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
1da177e4 | 463 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 464 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
465 | } |
466 | } | |
90699ce2 | 467 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 468 | if (tape->sense_key == 8) { |
1da177e4 | 469 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 470 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 471 | } |
346331f8 | 472 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 473 | pc->xferred) |
1da177e4 LT |
474 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
475 | } | |
476 | } | |
477 | ||
d01dbc3b | 478 | /* Free data buffers completely. */ |
077e3bdb | 479 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) |
1da177e4 | 480 | { |
077e3bdb | 481 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; |
d01dbc3b BP |
482 | |
483 | while (bh) { | |
484 | u32 size = bh->b_size; | |
485 | ||
486 | while (size) { | |
487 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
488 | ||
489 | if (bh->b_data) | |
490 | free_pages((unsigned long)bh->b_data, order); | |
491 | ||
492 | size &= (order-1); | |
493 | bh->b_data += (1 << order) * PAGE_SIZE; | |
1da177e4 LT |
494 | } |
495 | prev_bh = bh; | |
496 | bh = bh->b_reqnext; | |
497 | kfree(prev_bh); | |
498 | } | |
1da177e4 LT |
499 | } |
500 | ||
1da177e4 LT |
501 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
502 | { | |
503 | struct request *rq = HWGROUP(drive)->rq; | |
504 | idetape_tape_t *tape = drive->driver_data; | |
505 | unsigned long flags; | |
506 | int error; | |
1da177e4 | 507 | |
8004a8c9 | 508 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
509 | |
510 | switch (uptodate) { | |
5a04cfa9 BP |
511 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
512 | case 1: error = 0; break; | |
513 | default: error = uptodate; | |
1da177e4 LT |
514 | } |
515 | rq->errors = error; | |
516 | if (error) | |
517 | tape->failed_pc = NULL; | |
518 | ||
3687221f BZ |
519 | if (!blk_special_request(rq)) { |
520 | ide_end_request(drive, uptodate, nr_sects); | |
521 | return 0; | |
522 | } | |
523 | ||
54bb2074 | 524 | spin_lock_irqsave(&tape->lock, flags); |
1da177e4 | 525 | |
1da177e4 | 526 | ide_end_drive_cmd(drive, 0, 0); |
1da177e4 | 527 | |
54bb2074 | 528 | spin_unlock_irqrestore(&tape->lock, flags); |
1da177e4 LT |
529 | return 0; |
530 | } | |
531 | ||
92f5daff | 532 | static void ide_tape_callback(ide_drive_t *drive) |
1da177e4 LT |
533 | { |
534 | idetape_tape_t *tape = drive->driver_data; | |
5985e6ab BZ |
535 | struct ide_atapi_pc *pc = tape->pc; |
536 | int uptodate = pc->error ? 0 : 1; | |
1da177e4 | 537 | |
8004a8c9 BP |
538 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
539 | ||
dd2e9a03 BZ |
540 | if (tape->failed_pc == pc) |
541 | tape->failed_pc = NULL; | |
542 | ||
5985e6ab BZ |
543 | if (pc->c[0] == REQUEST_SENSE) { |
544 | if (uptodate) | |
545 | idetape_analyze_error(drive, pc->buf); | |
546 | else | |
547 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
548 | "itself - Aborting request!\n"); | |
549 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
550 | struct request *rq = drive->hwif->hwgroup->rq; | |
551 | int blocks = pc->xferred / tape->blk_size; | |
552 | ||
553 | tape->avg_size += blocks * tape->blk_size; | |
554 | ||
555 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
556 | tape->avg_speed = tape->avg_size * HZ / | |
557 | (jiffies - tape->avg_time) / 1024; | |
558 | tape->avg_size = 0; | |
559 | tape->avg_time = jiffies; | |
560 | } | |
561 | ||
562 | tape->first_frame += blocks; | |
563 | rq->current_nr_sectors -= blocks; | |
564 | ||
565 | if (pc->error) | |
566 | uptodate = pc->error; | |
567 | } else if (pc->c[0] == READ_POSITION && uptodate) { | |
568 | u8 *readpos = tape->pc->buf; | |
569 | ||
570 | debug_log(DBG_SENSE, "BOP - %s\n", | |
571 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
572 | debug_log(DBG_SENSE, "EOP - %s\n", | |
573 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
574 | ||
575 | if (readpos[0] & 0x4) { | |
576 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
577 | "to the tape\n"); | |
f2e3ab52 | 578 | clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab BZ |
579 | uptodate = 0; |
580 | } else { | |
581 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
cd740ab0 | 582 | be32_to_cpup((__be32 *)&readpos[4])); |
5985e6ab BZ |
583 | |
584 | tape->partition = readpos[1]; | |
cd740ab0 | 585 | tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); |
f2e3ab52 | 586 | set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 587 | } |
1da177e4 | 588 | } |
5985e6ab BZ |
589 | |
590 | idetape_end_request(drive, uptodate, 0); | |
1da177e4 LT |
591 | } |
592 | ||
d236d74c | 593 | static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 594 | { |
7bf7420a | 595 | ide_init_pc(pc); |
90699ce2 | 596 | pc->c[0] = REQUEST_SENSE; |
1da177e4 | 597 | pc->c[4] = 20; |
d236d74c | 598 | pc->req_xfer = 20; |
1da177e4 LT |
599 | } |
600 | ||
1da177e4 LT |
601 | /* |
602 | * idetape_retry_pc is called when an error was detected during the | |
603 | * last packet command. We queue a request sense packet command in | |
604 | * the head of the request list. | |
605 | */ | |
258ec411 | 606 | static void idetape_retry_pc(ide_drive_t *drive) |
1da177e4 | 607 | { |
394a4c21 BZ |
608 | struct ide_tape_obj *tape = drive->driver_data; |
609 | struct request *rq = &tape->request_sense_rq; | |
2e8a6f89 | 610 | struct ide_atapi_pc *pc = &tape->request_sense_pc; |
1da177e4 | 611 | |
64a57fe4 | 612 | (void)ide_read_error(drive); |
1da177e4 | 613 | idetape_create_request_sense_cmd(pc); |
f2e3ab52 | 614 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
7645c151 | 615 | ide_queue_pc_head(drive, tape->disk, pc, rq); |
1da177e4 LT |
616 | } |
617 | ||
618 | /* | |
3c98bf34 BP |
619 | * Postpone the current request so that ide.c will be able to service requests |
620 | * from another device on the same hwgroup while we are polling for DSC. | |
1da177e4 | 621 | */ |
5a04cfa9 | 622 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
623 | { |
624 | idetape_tape_t *tape = drive->driver_data; | |
625 | ||
8004a8c9 BP |
626 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
627 | ||
1da177e4 | 628 | tape->postponed_rq = HWGROUP(drive)->rq; |
54bb2074 | 629 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
630 | } |
631 | ||
74e63e74 BZ |
632 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
633 | { | |
634 | idetape_tape_t *tape = drive->driver_data; | |
635 | ||
636 | /* Media access command */ | |
637 | tape->dsc_polling_start = jiffies; | |
638 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
639 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
640 | /* Allow ide.c to handle other requests */ | |
641 | idetape_postpone_request(drive); | |
642 | } | |
643 | ||
acaa0f5f | 644 | static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
08424ac2 BZ |
645 | unsigned int bcount, int write) |
646 | { | |
647 | if (write) | |
648 | idetape_output_buffers(drive, pc, bcount); | |
649 | else | |
650 | idetape_input_buffers(drive, pc, bcount); | |
acaa0f5f BZ |
651 | |
652 | return bcount; | |
08424ac2 | 653 | } |
a1efc85f | 654 | |
1da177e4 | 655 | /* |
a1efc85f BP |
656 | * This is the usual interrupt handler which will be called during a packet |
657 | * command. We will transfer some of the data (as requested by the drive) and | |
658 | * will re-point interrupt handler to us. When data transfer is finished, we | |
659 | * will act according to the algorithm described before | |
8d06bfad | 660 | * idetape_issue_pc. |
1da177e4 | 661 | */ |
a1efc85f | 662 | static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) |
1da177e4 | 663 | { |
1da177e4 | 664 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 665 | |
646c0cb6 BZ |
666 | return ide_pc_intr(drive, tape->pc, idetape_pc_intr, IDETAPE_WAIT_CMD, |
667 | NULL, idetape_update_buffers, idetape_retry_pc, | |
668 | ide_tape_handle_dsc, ide_tape_io_buffers); | |
1da177e4 LT |
669 | } |
670 | ||
671 | /* | |
3c98bf34 | 672 | * Packet Command Interface |
1da177e4 | 673 | * |
3c98bf34 BP |
674 | * The current Packet Command is available in tape->pc, and will not change |
675 | * until we finish handling it. Each packet command is associated with a | |
676 | * callback function that will be called when the command is finished. | |
1da177e4 | 677 | * |
3c98bf34 | 678 | * The handling will be done in three stages: |
1da177e4 | 679 | * |
3c98bf34 BP |
680 | * 1. idetape_issue_pc will send the packet command to the drive, and will set |
681 | * the interrupt handler to idetape_pc_intr. | |
1da177e4 | 682 | * |
3c98bf34 BP |
683 | * 2. On each interrupt, idetape_pc_intr will be called. This step will be |
684 | * repeated until the device signals us that no more interrupts will be issued. | |
1da177e4 | 685 | * |
3c98bf34 BP |
686 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
687 | * process. In case of a successful initiation of a media access packet command, | |
688 | * the DSC bit will be set when the actual execution of the command is finished. | |
689 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
690 | * event. In this case, we define the request as "low priority request" by | |
691 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
692 | * exit the driver. | |
1da177e4 | 693 | * |
3c98bf34 BP |
694 | * ide.c will then give higher priority to requests which originate from the |
695 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 696 | * |
3c98bf34 | 697 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 698 | * |
3c98bf34 BP |
699 | * 5. In case an error was found, we queue a request sense packet command in |
700 | * front of the request queue and retry the operation up to | |
701 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 702 | * |
3c98bf34 BP |
703 | * 6. In case no error was found, or we decided to give up and not to retry |
704 | * again, the callback function will be called and then we will handle the next | |
705 | * request. | |
1da177e4 LT |
706 | */ |
707 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) | |
708 | { | |
1da177e4 | 709 | idetape_tape_t *tape = drive->driver_data; |
9567b349 | 710 | |
594c16d8 BZ |
711 | return ide_transfer_pc(drive, tape->pc, idetape_pc_intr, |
712 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
713 | } |
714 | ||
d236d74c BP |
715 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
716 | struct ide_atapi_pc *pc) | |
1da177e4 | 717 | { |
1da177e4 | 718 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 719 | |
90699ce2 BP |
720 | if (tape->pc->c[0] == REQUEST_SENSE && |
721 | pc->c[0] == REQUEST_SENSE) { | |
1da177e4 LT |
722 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
723 | "Two request sense in serial were issued\n"); | |
724 | } | |
1da177e4 | 725 | |
90699ce2 | 726 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
1da177e4 LT |
727 | tape->failed_pc = pc; |
728 | /* Set the current packet command */ | |
729 | tape->pc = pc; | |
730 | ||
731 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 732 | (pc->flags & PC_FLAG_ABORT)) { |
1da177e4 | 733 | /* |
3c98bf34 BP |
734 | * We will "abort" retrying a packet command in case legitimate |
735 | * error code was received (crossing a filemark, or end of the | |
736 | * media, for example). | |
1da177e4 | 737 | */ |
346331f8 | 738 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 739 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
740 | tape->sense_key == 2 && tape->asc == 4 && |
741 | (tape->ascq == 1 || tape->ascq == 8))) { | |
742 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
743 | "pc = %2x, key = %2x, " | |
744 | "asc = %2x, ascq = %2x\n", | |
745 | tape->name, pc->c[0], | |
746 | tape->sense_key, tape->asc, | |
747 | tape->ascq); | |
748 | } | |
749 | /* Giving up */ | |
750 | pc->error = IDETAPE_ERROR_GENERAL; | |
751 | } | |
752 | tape->failed_pc = NULL; | |
776bb027 | 753 | drive->pc_callback(drive); |
92f5daff | 754 | return ide_stopped; |
1da177e4 | 755 | } |
8004a8c9 | 756 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
757 | |
758 | pc->retries++; | |
1da177e4 | 759 | |
6bf1641c BZ |
760 | return ide_issue_pc(drive, pc, idetape_transfer_pc, |
761 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
762 | } |
763 | ||
3c98bf34 | 764 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 765 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 | 766 | { |
7bf7420a | 767 | ide_init_pc(pc); |
90699ce2 | 768 | pc->c[0] = MODE_SENSE; |
1da177e4 | 769 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
770 | /* DBD = 1 - Don't return block descriptors */ |
771 | pc->c[1] = 8; | |
1da177e4 LT |
772 | pc->c[2] = page_code; |
773 | /* | |
774 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
775 | * | |
776 | * For SCSI this byte is defined as subpage instead of high byte | |
777 | * of length and some IDE drives seem to interpret it this way | |
778 | * and return an error when 255 is used. | |
779 | */ | |
780 | pc->c[3] = 0; | |
3c98bf34 BP |
781 | /* We will just discard data in that case */ |
782 | pc->c[4] = 255; | |
1da177e4 | 783 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 784 | pc->req_xfer = 12; |
1da177e4 | 785 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 786 | pc->req_xfer = 24; |
1da177e4 | 787 | else |
d236d74c | 788 | pc->req_xfer = 50; |
1da177e4 LT |
789 | } |
790 | ||
5a04cfa9 | 791 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 792 | { |
b73c7ee2 | 793 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 794 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 795 | struct ide_atapi_pc *pc = tape->pc; |
22c525b9 | 796 | u8 stat; |
1da177e4 | 797 | |
374e042c | 798 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 799 | |
3a7d2484 BZ |
800 | if (stat & ATA_DSC) { |
801 | if (stat & ATA_ERR) { | |
1da177e4 | 802 | /* Error detected */ |
90699ce2 | 803 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
804 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
805 | tape->name); | |
806 | /* Retry operation */ | |
258ec411 BZ |
807 | idetape_retry_pc(drive); |
808 | return ide_stopped; | |
1da177e4 LT |
809 | } |
810 | pc->error = 0; | |
1da177e4 LT |
811 | } else { |
812 | pc->error = IDETAPE_ERROR_GENERAL; | |
813 | tape->failed_pc = NULL; | |
814 | } | |
776bb027 | 815 | drive->pc_callback(drive); |
1da177e4 LT |
816 | return ide_stopped; |
817 | } | |
818 | ||
cd2abbfe | 819 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
820 | struct ide_atapi_pc *pc, struct request *rq, |
821 | u8 opcode) | |
1da177e4 | 822 | { |
0014c75b BP |
823 | struct idetape_bh *bh = (struct idetape_bh *)rq->special; |
824 | unsigned int length = rq->current_nr_sectors; | |
825 | ||
7bf7420a | 826 | ide_init_pc(pc); |
860ff5ec | 827 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 828 | pc->c[1] = 1; |
1da177e4 | 829 | pc->bh = bh; |
d236d74c BP |
830 | pc->buf = NULL; |
831 | pc->buf_size = length * tape->blk_size; | |
832 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 833 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 834 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 835 | |
cd2abbfe BP |
836 | if (opcode == READ_6) { |
837 | pc->c[0] = READ_6; | |
838 | atomic_set(&bh->b_count, 0); | |
839 | } else if (opcode == WRITE_6) { | |
840 | pc->c[0] = WRITE_6; | |
841 | pc->flags |= PC_FLAG_WRITING; | |
842 | pc->b_data = bh->b_data; | |
843 | pc->b_count = atomic_read(&bh->b_count); | |
844 | } | |
0014c75b BP |
845 | |
846 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
847 | } |
848 | ||
1da177e4 LT |
849 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
850 | struct request *rq, sector_t block) | |
851 | { | |
b73c7ee2 | 852 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 853 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 854 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 855 | struct request *postponed_rq = tape->postponed_rq; |
22c525b9 | 856 | u8 stat; |
1da177e4 | 857 | |
730616b2 MW |
858 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu," |
859 | " current_nr_sectors: %u\n", | |
860 | (unsigned long long)rq->sector, rq->nr_sectors, | |
861 | rq->current_nr_sectors); | |
1da177e4 | 862 | |
4aff5e23 | 863 | if (!blk_special_request(rq)) { |
3c98bf34 | 864 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 865 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 866 | "request queue (%d)\n", drive->name, rq->cmd_type); |
1da177e4 LT |
867 | ide_end_request(drive, 0, 0); |
868 | return ide_stopped; | |
869 | } | |
870 | ||
3c98bf34 | 871 | /* Retry a failed packet command */ |
28c7214b BZ |
872 | if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) { |
873 | pc = tape->failed_pc; | |
874 | goto out; | |
875 | } | |
5a04cfa9 | 876 | |
1da177e4 LT |
877 | if (postponed_rq != NULL) |
878 | if (rq != postponed_rq) { | |
879 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
880 | "Two DSC requests were queued\n"); | |
881 | idetape_end_request(drive, 0, 0); | |
882 | return ide_stopped; | |
883 | } | |
1da177e4 LT |
884 | |
885 | tape->postponed_rq = NULL; | |
886 | ||
887 | /* | |
888 | * If the tape is still busy, postpone our request and service | |
889 | * the other device meanwhile. | |
890 | */ | |
374e042c | 891 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 892 | |
83dd5735 | 893 | if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2)) |
f2e3ab52 | 894 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 LT |
895 | |
896 | if (drive->post_reset == 1) { | |
f2e3ab52 | 897 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 LT |
898 | drive->post_reset = 0; |
899 | } | |
900 | ||
f2e3ab52 | 901 | if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && |
3a7d2484 | 902 | (stat & ATA_DSC) == 0) { |
1da177e4 LT |
903 | if (postponed_rq == NULL) { |
904 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 905 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
906 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
907 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
908 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
909 | tape->name); | |
83dd5735 | 910 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
911 | idetape_media_access_finished(drive); |
912 | return ide_stopped; | |
913 | } else { | |
914 | return ide_do_reset(drive); | |
915 | } | |
5a04cfa9 BP |
916 | } else if (time_after(jiffies, |
917 | tape->dsc_polling_start + | |
918 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 919 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
920 | idetape_postpone_request(drive); |
921 | return ide_stopped; | |
922 | } | |
83dd5735 | 923 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
2e8a6f89 | 924 | pc = &tape->queued_pc; |
0014c75b | 925 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
926 | goto out; |
927 | } | |
83dd5735 | 928 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
2e8a6f89 | 929 | pc = &tape->queued_pc; |
0014c75b | 930 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
931 | goto out; |
932 | } | |
83dd5735 | 933 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
d236d74c | 934 | pc = (struct ide_atapi_pc *) rq->buffer; |
83dd5735 BP |
935 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
936 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
937 | goto out; |
938 | } | |
83dd5735 | 939 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
940 | idetape_media_access_finished(drive); |
941 | return ide_stopped; | |
942 | } | |
943 | BUG(); | |
28c7214b | 944 | |
f2e3ab52 | 945 | out: |
8d06bfad | 946 | return idetape_issue_pc(drive, pc); |
1da177e4 LT |
947 | } |
948 | ||
1da177e4 | 949 | /* |
41aa1706 | 950 | * The function below uses __get_free_pages to allocate a data buffer of size |
f73850a3 | 951 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
3c98bf34 | 952 | * much as possible. |
1da177e4 | 953 | * |
41aa1706 BP |
954 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
955 | * failure. | |
1da177e4 | 956 | */ |
077e3bdb BP |
957 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, |
958 | int full, int clear) | |
1da177e4 | 959 | { |
077e3bdb | 960 | struct idetape_bh *prev_bh, *bh, *merge_bh; |
a997a435 | 961 | int pages = tape->pages_per_buffer; |
41aa1706 | 962 | unsigned int order, b_allocd; |
1da177e4 LT |
963 | char *b_data = NULL; |
964 | ||
077e3bdb BP |
965 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
966 | bh = merge_bh; | |
1da177e4 LT |
967 | if (bh == NULL) |
968 | goto abort; | |
41aa1706 BP |
969 | |
970 | order = fls(pages) - 1; | |
971 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 972 | if (!bh->b_data) |
1da177e4 | 973 | goto abort; |
41aa1706 BP |
974 | b_allocd = (1 << order) * PAGE_SIZE; |
975 | pages &= (order-1); | |
976 | ||
1da177e4 | 977 | if (clear) |
41aa1706 BP |
978 | memset(bh->b_data, 0, b_allocd); |
979 | bh->b_reqnext = NULL; | |
980 | bh->b_size = b_allocd; | |
1da177e4 LT |
981 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
982 | ||
41aa1706 BP |
983 | while (pages) { |
984 | order = fls(pages) - 1; | |
985 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 986 | if (!b_data) |
1da177e4 | 987 | goto abort; |
41aa1706 BP |
988 | b_allocd = (1 << order) * PAGE_SIZE; |
989 | ||
1da177e4 | 990 | if (clear) |
41aa1706 BP |
991 | memset(b_data, 0, b_allocd); |
992 | ||
993 | /* newly allocated page frames below buffer header or ...*/ | |
994 | if (bh->b_data == b_data + b_allocd) { | |
995 | bh->b_size += b_allocd; | |
996 | bh->b_data -= b_allocd; | |
1da177e4 | 997 | if (full) |
41aa1706 | 998 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
999 | continue; |
1000 | } | |
41aa1706 | 1001 | /* they are above the header */ |
1da177e4 | 1002 | if (b_data == bh->b_data + bh->b_size) { |
41aa1706 | 1003 | bh->b_size += b_allocd; |
1da177e4 | 1004 | if (full) |
41aa1706 | 1005 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1006 | continue; |
1007 | } | |
1008 | prev_bh = bh; | |
5a04cfa9 BP |
1009 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1010 | if (!bh) { | |
41aa1706 | 1011 | free_pages((unsigned long) b_data, order); |
1da177e4 LT |
1012 | goto abort; |
1013 | } | |
1014 | bh->b_reqnext = NULL; | |
1015 | bh->b_data = b_data; | |
41aa1706 | 1016 | bh->b_size = b_allocd; |
1da177e4 LT |
1017 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1018 | prev_bh->b_reqnext = bh; | |
41aa1706 BP |
1019 | |
1020 | pages &= (order-1); | |
1da177e4 | 1021 | } |
41aa1706 | 1022 | |
1da177e4 LT |
1023 | bh->b_size -= tape->excess_bh_size; |
1024 | if (full) | |
1025 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
077e3bdb | 1026 | return merge_bh; |
1da177e4 | 1027 | abort: |
077e3bdb | 1028 | ide_tape_kfree_buffer(tape); |
1da177e4 LT |
1029 | return NULL; |
1030 | } | |
1031 | ||
5a04cfa9 | 1032 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
8646c88f | 1033 | const char __user *buf, int n) |
1da177e4 LT |
1034 | { |
1035 | struct idetape_bh *bh = tape->bh; | |
1036 | int count; | |
dcd96379 | 1037 | int ret = 0; |
1da177e4 LT |
1038 | |
1039 | while (n) { | |
1da177e4 | 1040 | if (bh == NULL) { |
5a04cfa9 BP |
1041 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1042 | __func__); | |
dcd96379 | 1043 | return 1; |
1da177e4 | 1044 | } |
5a04cfa9 BP |
1045 | count = min((unsigned int) |
1046 | (bh->b_size - atomic_read(&bh->b_count)), | |
1047 | (unsigned int)n); | |
1048 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
1049 | count)) | |
dcd96379 | 1050 | ret = 1; |
1da177e4 LT |
1051 | n -= count; |
1052 | atomic_add(count, &bh->b_count); | |
1053 | buf += count; | |
1054 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
1055 | bh = bh->b_reqnext; | |
1056 | if (bh) | |
1057 | atomic_set(&bh->b_count, 0); | |
1058 | } | |
1059 | } | |
1060 | tape->bh = bh; | |
dcd96379 | 1061 | return ret; |
1da177e4 LT |
1062 | } |
1063 | ||
5a04cfa9 | 1064 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
99d74e61 | 1065 | int n) |
1da177e4 LT |
1066 | { |
1067 | struct idetape_bh *bh = tape->bh; | |
1068 | int count; | |
dcd96379 | 1069 | int ret = 0; |
1da177e4 LT |
1070 | |
1071 | while (n) { | |
1da177e4 | 1072 | if (bh == NULL) { |
5a04cfa9 BP |
1073 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1074 | __func__); | |
dcd96379 | 1075 | return 1; |
1da177e4 | 1076 | } |
1da177e4 | 1077 | count = min(tape->b_count, n); |
dcd96379 DW |
1078 | if (copy_to_user(buf, tape->b_data, count)) |
1079 | ret = 1; | |
1da177e4 LT |
1080 | n -= count; |
1081 | tape->b_data += count; | |
1082 | tape->b_count -= count; | |
1083 | buf += count; | |
1084 | if (!tape->b_count) { | |
5a04cfa9 BP |
1085 | bh = bh->b_reqnext; |
1086 | tape->bh = bh; | |
1da177e4 LT |
1087 | if (bh) { |
1088 | tape->b_data = bh->b_data; | |
1089 | tape->b_count = atomic_read(&bh->b_count); | |
1090 | } | |
1091 | } | |
1092 | } | |
dcd96379 | 1093 | return ret; |
1da177e4 LT |
1094 | } |
1095 | ||
077e3bdb | 1096 | static void idetape_init_merge_buffer(idetape_tape_t *tape) |
1da177e4 | 1097 | { |
077e3bdb BP |
1098 | struct idetape_bh *bh = tape->merge_bh; |
1099 | tape->bh = tape->merge_bh; | |
5a04cfa9 | 1100 | |
54abf37e | 1101 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 LT |
1102 | atomic_set(&bh->b_count, 0); |
1103 | else { | |
1104 | tape->b_data = bh->b_data; | |
1105 | tape->b_count = atomic_read(&bh->b_count); | |
1106 | } | |
1107 | } | |
1108 | ||
1da177e4 | 1109 | /* |
3c98bf34 BP |
1110 | * Write a filemark if write_filemark=1. Flush the device buffers without |
1111 | * writing a filemark otherwise. | |
1da177e4 | 1112 | */ |
5a04cfa9 | 1113 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 1114 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 | 1115 | { |
7bf7420a | 1116 | ide_init_pc(pc); |
90699ce2 | 1117 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 1118 | pc->c[4] = write_filemark; |
346331f8 | 1119 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1120 | } |
1121 | ||
d236d74c | 1122 | static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1123 | { |
7bf7420a | 1124 | ide_init_pc(pc); |
90699ce2 | 1125 | pc->c[0] = TEST_UNIT_READY; |
1da177e4 LT |
1126 | } |
1127 | ||
1128 | /* | |
3c98bf34 | 1129 | * We add a special packet command request to the tail of the request queue, and |
394a4c21 | 1130 | * wait for it to be serviced. |
1da177e4 | 1131 | */ |
ea1ab3d3 | 1132 | static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
1133 | { |
1134 | struct ide_tape_obj *tape = drive->driver_data; | |
64ea1b4a FT |
1135 | struct request *rq; |
1136 | int error; | |
1da177e4 | 1137 | |
64ea1b4a FT |
1138 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1139 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1140 | rq->cmd[13] = REQ_IDETAPE_PC1; |
64ea1b4a | 1141 | rq->buffer = (char *)pc; |
0014c75b | 1142 | memcpy(rq->cmd, pc->c, 12); |
64ea1b4a FT |
1143 | error = blk_execute_rq(drive->queue, tape->disk, rq, 0); |
1144 | blk_put_request(rq); | |
1145 | return error; | |
1da177e4 LT |
1146 | } |
1147 | ||
d236d74c BP |
1148 | static void idetape_create_load_unload_cmd(ide_drive_t *drive, |
1149 | struct ide_atapi_pc *pc, int cmd) | |
1da177e4 | 1150 | { |
7bf7420a | 1151 | ide_init_pc(pc); |
90699ce2 | 1152 | pc->c[0] = START_STOP; |
1da177e4 | 1153 | pc->c[4] = cmd; |
346331f8 | 1154 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1155 | } |
1156 | ||
1157 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) | |
1158 | { | |
1159 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1160 | struct ide_atapi_pc pc; |
1da177e4 LT |
1161 | int load_attempted = 0; |
1162 | ||
3c98bf34 | 1163 | /* Wait for the tape to become ready */ |
f2e3ab52 | 1164 | set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
1da177e4 LT |
1165 | timeout += jiffies; |
1166 | while (time_before(jiffies, timeout)) { | |
1167 | idetape_create_test_unit_ready_cmd(&pc); | |
ea1ab3d3 | 1168 | if (!idetape_queue_pc_tail(drive, &pc)) |
1da177e4 LT |
1169 | return 0; |
1170 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
1171 | || (tape->asc == 0x3A)) { |
1172 | /* no media */ | |
1da177e4 LT |
1173 | if (load_attempted) |
1174 | return -ENOMEDIUM; | |
5a04cfa9 BP |
1175 | idetape_create_load_unload_cmd(drive, &pc, |
1176 | IDETAPE_LU_LOAD_MASK); | |
ea1ab3d3 | 1177 | idetape_queue_pc_tail(drive, &pc); |
1da177e4 LT |
1178 | load_attempted = 1; |
1179 | /* not about to be ready */ | |
1180 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1181 | (tape->ascq == 1 || tape->ascq == 8))) | |
1182 | return -EIO; | |
80ce45fd | 1183 | msleep(100); |
1da177e4 LT |
1184 | } |
1185 | return -EIO; | |
1186 | } | |
1187 | ||
5a04cfa9 | 1188 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 1189 | { |
d236d74c | 1190 | struct ide_atapi_pc pc; |
1da177e4 LT |
1191 | int rc; |
1192 | ||
1193 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
5a04cfa9 BP |
1194 | rc = idetape_queue_pc_tail(drive, &pc); |
1195 | if (rc) | |
1da177e4 LT |
1196 | return rc; |
1197 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1198 | return 0; | |
1199 | } | |
1200 | ||
d236d74c | 1201 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1202 | { |
7bf7420a | 1203 | ide_init_pc(pc); |
90699ce2 | 1204 | pc->c[0] = READ_POSITION; |
d236d74c | 1205 | pc->req_xfer = 20; |
1da177e4 LT |
1206 | } |
1207 | ||
5a04cfa9 | 1208 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
1209 | { |
1210 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1211 | struct ide_atapi_pc pc; |
1da177e4 LT |
1212 | int position; |
1213 | ||
8004a8c9 | 1214 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
1215 | |
1216 | idetape_create_read_position_cmd(&pc); | |
1217 | if (idetape_queue_pc_tail(drive, &pc)) | |
1218 | return -1; | |
54bb2074 | 1219 | position = tape->first_frame; |
1da177e4 LT |
1220 | return position; |
1221 | } | |
1222 | ||
d236d74c BP |
1223 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
1224 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1225 | unsigned int block, u8 partition, int skip) |
1da177e4 | 1226 | { |
7bf7420a | 1227 | ide_init_pc(pc); |
90699ce2 | 1228 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 1229 | pc->c[1] = 2; |
860ff5ec | 1230 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 1231 | pc->c[8] = partition; |
346331f8 | 1232 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1233 | } |
1234 | ||
d236d74c BP |
1235 | static int idetape_create_prevent_cmd(ide_drive_t *drive, |
1236 | struct ide_atapi_pc *pc, int prevent) | |
1da177e4 LT |
1237 | { |
1238 | idetape_tape_t *tape = drive->driver_data; | |
1239 | ||
b6422013 BP |
1240 | /* device supports locking according to capabilities page */ |
1241 | if (!(tape->caps[6] & 0x01)) | |
1da177e4 LT |
1242 | return 0; |
1243 | ||
7bf7420a | 1244 | ide_init_pc(pc); |
90699ce2 | 1245 | pc->c[0] = ALLOW_MEDIUM_REMOVAL; |
1da177e4 | 1246 | pc->c[4] = prevent; |
1da177e4 LT |
1247 | return 1; |
1248 | } | |
1249 | ||
385a4b87 BZ |
1250 | static int ide_tape_set_media_lock(ide_drive_t *drive, int on) |
1251 | { | |
1252 | struct ide_atapi_pc pc; | |
1253 | ||
1254 | if (!idetape_create_prevent_cmd(drive, &pc, on)) | |
1255 | return 0; | |
1256 | ||
1257 | return idetape_queue_pc_tail(drive, &pc); | |
1258 | } | |
1259 | ||
ec0fdb01 | 1260 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1261 | { |
1262 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1263 | |
54abf37e | 1264 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 1265 | return; |
1da177e4 | 1266 | |
f2e3ab52 | 1267 | clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); |
01a63aeb | 1268 | tape->merge_bh_size = 0; |
077e3bdb BP |
1269 | if (tape->merge_bh != NULL) { |
1270 | ide_tape_kfree_buffer(tape); | |
1271 | tape->merge_bh = NULL; | |
1da177e4 LT |
1272 | } |
1273 | ||
54abf37e | 1274 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1275 | } |
1276 | ||
1277 | /* | |
3c98bf34 BP |
1278 | * Position the tape to the requested block using the LOCATE packet command. |
1279 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1280 | * all higher level operations, we queue the commands at the tail of the request | |
1281 | * queue and wait for their completion. | |
1da177e4 | 1282 | */ |
5a04cfa9 BP |
1283 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
1284 | u8 partition, int skip) | |
1da177e4 LT |
1285 | { |
1286 | idetape_tape_t *tape = drive->driver_data; | |
1287 | int retval; | |
d236d74c | 1288 | struct ide_atapi_pc pc; |
1da177e4 | 1289 | |
54abf37e | 1290 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 1291 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1292 | idetape_wait_ready(drive, 60 * 5 * HZ); |
1293 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
1294 | retval = idetape_queue_pc_tail(drive, &pc); | |
1295 | if (retval) | |
1296 | return (retval); | |
1297 | ||
1298 | idetape_create_read_position_cmd(&pc); | |
1299 | return (idetape_queue_pc_tail(drive, &pc)); | |
1300 | } | |
1301 | ||
ec0fdb01 | 1302 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 1303 | int restore_position) |
1da177e4 LT |
1304 | { |
1305 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1306 | int seek, position; |
1307 | ||
ec0fdb01 | 1308 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1309 | if (restore_position) { |
1310 | position = idetape_read_position(drive); | |
9798630a | 1311 | seek = position > 0 ? position : 0; |
1da177e4 | 1312 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 1313 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 1314 | " %s\n", tape->name, __func__); |
1da177e4 LT |
1315 | return; |
1316 | } | |
1317 | } | |
1318 | } | |
1319 | ||
1320 | /* | |
3c98bf34 BP |
1321 | * Generate a read/write request for the block device interface and wait for it |
1322 | * to be serviced. | |
1da177e4 | 1323 | */ |
5a04cfa9 BP |
1324 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
1325 | struct idetape_bh *bh) | |
1da177e4 LT |
1326 | { |
1327 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a FT |
1328 | struct request *rq; |
1329 | int ret, errors; | |
1da177e4 | 1330 | |
8004a8c9 BP |
1331 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
1332 | ||
64ea1b4a FT |
1333 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1334 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1335 | rq->cmd[13] = cmd; |
64ea1b4a FT |
1336 | rq->rq_disk = tape->disk; |
1337 | rq->special = (void *)bh; | |
1338 | rq->sector = tape->first_frame; | |
1339 | rq->nr_sectors = blocks; | |
1340 | rq->current_nr_sectors = blocks; | |
1341 | blk_execute_rq(drive->queue, tape->disk, rq, 0); | |
1342 | ||
1343 | errors = rq->errors; | |
1344 | ret = tape->blk_size * (blocks - rq->current_nr_sectors); | |
1345 | blk_put_request(rq); | |
1da177e4 LT |
1346 | |
1347 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1348 | return 0; | |
1349 | ||
077e3bdb BP |
1350 | if (tape->merge_bh) |
1351 | idetape_init_merge_buffer(tape); | |
64ea1b4a | 1352 | if (errors == IDETAPE_ERROR_GENERAL) |
1da177e4 | 1353 | return -EIO; |
64ea1b4a | 1354 | return ret; |
1da177e4 LT |
1355 | } |
1356 | ||
d236d74c | 1357 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1358 | { |
7bf7420a | 1359 | ide_init_pc(pc); |
90699ce2 | 1360 | pc->c[0] = INQUIRY; |
5a04cfa9 | 1361 | pc->c[4] = 254; |
d236d74c | 1362 | pc->req_xfer = 254; |
1da177e4 LT |
1363 | } |
1364 | ||
d236d74c BP |
1365 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
1366 | struct ide_atapi_pc *pc) | |
1da177e4 | 1367 | { |
7bf7420a | 1368 | ide_init_pc(pc); |
90699ce2 | 1369 | pc->c[0] = REZERO_UNIT; |
346331f8 | 1370 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1371 | } |
1372 | ||
d236d74c | 1373 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1374 | { |
7bf7420a | 1375 | ide_init_pc(pc); |
90699ce2 | 1376 | pc->c[0] = ERASE; |
1da177e4 | 1377 | pc->c[1] = 1; |
346331f8 | 1378 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1379 | } |
1380 | ||
d236d74c | 1381 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 | 1382 | { |
7bf7420a | 1383 | ide_init_pc(pc); |
90699ce2 | 1384 | pc->c[0] = SPACE; |
860ff5ec | 1385 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 1386 | pc->c[1] = cmd; |
346331f8 | 1387 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1388 | } |
1389 | ||
97c566ce | 1390 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 1391 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1392 | { |
1393 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1394 | |
8004a8c9 | 1395 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 1396 | |
0aa4b01e | 1397 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
077e3bdb | 1398 | blocks, tape->merge_bh); |
1da177e4 LT |
1399 | } |
1400 | ||
d9df937a | 1401 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1402 | { |
1403 | idetape_tape_t *tape = drive->driver_data; | |
1404 | int blocks, min; | |
1405 | struct idetape_bh *bh; | |
55a5d291 | 1406 | |
54abf37e | 1407 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 1408 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 1409 | " but we are not writing.\n"); |
1da177e4 LT |
1410 | return; |
1411 | } | |
01a63aeb | 1412 | if (tape->merge_bh_size > tape->buffer_size) { |
1da177e4 | 1413 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
01a63aeb | 1414 | tape->merge_bh_size = tape->buffer_size; |
1da177e4 | 1415 | } |
01a63aeb BP |
1416 | if (tape->merge_bh_size) { |
1417 | blocks = tape->merge_bh_size / tape->blk_size; | |
1418 | if (tape->merge_bh_size % tape->blk_size) { | |
1da177e4 LT |
1419 | unsigned int i; |
1420 | ||
1421 | blocks++; | |
01a63aeb | 1422 | i = tape->blk_size - tape->merge_bh_size % |
54bb2074 | 1423 | tape->blk_size; |
1da177e4 LT |
1424 | bh = tape->bh->b_reqnext; |
1425 | while (bh) { | |
1426 | atomic_set(&bh->b_count, 0); | |
1427 | bh = bh->b_reqnext; | |
1428 | } | |
1429 | bh = tape->bh; | |
1430 | while (i) { | |
1431 | if (bh == NULL) { | |
5a04cfa9 BP |
1432 | printk(KERN_INFO "ide-tape: bug," |
1433 | " bh NULL\n"); | |
1da177e4 LT |
1434 | break; |
1435 | } | |
5a04cfa9 BP |
1436 | min = min(i, (unsigned int)(bh->b_size - |
1437 | atomic_read(&bh->b_count))); | |
1438 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1439 | 0, min); | |
1da177e4 LT |
1440 | atomic_add(min, &bh->b_count); |
1441 | i -= min; | |
1442 | bh = bh->b_reqnext; | |
1443 | } | |
1444 | } | |
1445 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
01a63aeb | 1446 | tape->merge_bh_size = 0; |
1da177e4 | 1447 | } |
077e3bdb BP |
1448 | if (tape->merge_bh != NULL) { |
1449 | ide_tape_kfree_buffer(tape); | |
1450 | tape->merge_bh = NULL; | |
1da177e4 | 1451 | } |
54abf37e | 1452 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1453 | } |
1454 | ||
83042b24 | 1455 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
1456 | { |
1457 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1458 | int bytes_read; |
1da177e4 LT |
1459 | |
1460 | /* Initialize read operation */ | |
54abf37e BP |
1461 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1462 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
d9df937a | 1463 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1464 | idetape_flush_tape_buffers(drive); |
1465 | } | |
077e3bdb | 1466 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1467 | printk(KERN_ERR "ide-tape: merge_bh_size should be" |
5a04cfa9 | 1468 | " 0 now\n"); |
01a63aeb | 1469 | tape->merge_bh_size = 0; |
1da177e4 | 1470 | } |
077e3bdb BP |
1471 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1472 | if (!tape->merge_bh) | |
1da177e4 | 1473 | return -ENOMEM; |
54abf37e | 1474 | tape->chrdev_dir = IDETAPE_DIR_READ; |
1da177e4 LT |
1475 | |
1476 | /* | |
3c98bf34 BP |
1477 | * Issue a read 0 command to ensure that DSC handshake is |
1478 | * switched from completion mode to buffer available mode. | |
1479 | * No point in issuing this if DSC overlap isn't supported, some | |
1480 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1481 | */ |
1482 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1483 | bytes_read = idetape_queue_rw_tail(drive, |
1484 | REQ_IDETAPE_READ, 0, | |
077e3bdb | 1485 | tape->merge_bh); |
1da177e4 | 1486 | if (bytes_read < 0) { |
077e3bdb BP |
1487 | ide_tape_kfree_buffer(tape); |
1488 | tape->merge_bh = NULL; | |
54abf37e | 1489 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1490 | return bytes_read; |
1491 | } | |
1492 | } | |
1493 | } | |
5e69bd95 | 1494 | |
1da177e4 LT |
1495 | return 0; |
1496 | } | |
1497 | ||
5bd50dc6 | 1498 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1499 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1500 | { |
1501 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1502 | |
8004a8c9 | 1503 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1504 | |
3c98bf34 | 1505 | /* If we are at a filemark, return a read length of 0 */ |
f2e3ab52 | 1506 | if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 LT |
1507 | return 0; |
1508 | ||
83042b24 | 1509 | idetape_init_read(drive); |
5e69bd95 | 1510 | |
5e69bd95 | 1511 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
077e3bdb | 1512 | tape->merge_bh); |
1da177e4 LT |
1513 | } |
1514 | ||
5a04cfa9 | 1515 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1516 | { |
1517 | idetape_tape_t *tape = drive->driver_data; | |
1518 | struct idetape_bh *bh; | |
1519 | int blocks; | |
3c98bf34 | 1520 | |
1da177e4 LT |
1521 | while (bcount) { |
1522 | unsigned int count; | |
1523 | ||
077e3bdb | 1524 | bh = tape->merge_bh; |
f73850a3 | 1525 | count = min(tape->buffer_size, bcount); |
1da177e4 | 1526 | bcount -= count; |
54bb2074 | 1527 | blocks = count / tape->blk_size; |
1da177e4 | 1528 | while (count) { |
5a04cfa9 BP |
1529 | atomic_set(&bh->b_count, |
1530 | min(count, (unsigned int)bh->b_size)); | |
1da177e4 LT |
1531 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
1532 | count -= atomic_read(&bh->b_count); | |
1533 | bh = bh->b_reqnext; | |
1534 | } | |
5a04cfa9 | 1535 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
077e3bdb | 1536 | tape->merge_bh); |
1da177e4 LT |
1537 | } |
1538 | } | |
1539 | ||
1da177e4 | 1540 | /* |
3c98bf34 BP |
1541 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1542 | * currently support only one partition. | |
1543 | */ | |
5a04cfa9 | 1544 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 LT |
1545 | { |
1546 | int retval; | |
d236d74c | 1547 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1548 | idetape_tape_t *tape; |
1549 | tape = drive->driver_data; | |
1550 | ||
1551 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1552 | ||
1da177e4 LT |
1553 | idetape_create_rewind_cmd(drive, &pc); |
1554 | retval = idetape_queue_pc_tail(drive, &pc); | |
1555 | if (retval) | |
1556 | return retval; | |
1557 | ||
1558 | idetape_create_read_position_cmd(&pc); | |
1559 | retval = idetape_queue_pc_tail(drive, &pc); | |
1560 | if (retval) | |
1561 | return retval; | |
1562 | return 0; | |
1563 | } | |
1564 | ||
3c98bf34 | 1565 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1566 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1567 | unsigned long arg) | |
1da177e4 LT |
1568 | { |
1569 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1570 | void __user *argp = (void __user *)arg; |
1571 | ||
d59823fa BP |
1572 | struct idetape_config { |
1573 | int dsc_rw_frequency; | |
1574 | int dsc_media_access_frequency; | |
1575 | int nr_stages; | |
1576 | } config; | |
1577 | ||
8004a8c9 BP |
1578 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1579 | ||
1da177e4 | 1580 | switch (cmd) { |
5a04cfa9 BP |
1581 | case 0x0340: |
1582 | if (copy_from_user(&config, argp, sizeof(config))) | |
1583 | return -EFAULT; | |
1584 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1585 | break; |
1586 | case 0x0350: | |
1587 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1588 | config.nr_stages = 1; |
5a04cfa9 BP |
1589 | if (copy_to_user(argp, &config, sizeof(config))) |
1590 | return -EFAULT; | |
1591 | break; | |
1592 | default: | |
1593 | return -EIO; | |
1da177e4 LT |
1594 | } |
1595 | return 0; | |
1596 | } | |
1597 | ||
5a04cfa9 BP |
1598 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1599 | int mt_count) | |
1da177e4 LT |
1600 | { |
1601 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1602 | struct ide_atapi_pc pc; |
5a04cfa9 | 1603 | int retval, count = 0; |
b6422013 | 1604 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1605 | |
1606 | if (mt_count == 0) | |
1607 | return 0; | |
1608 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1609 | if (!sprev) |
1da177e4 | 1610 | return -EIO; |
5a04cfa9 | 1611 | mt_count = -mt_count; |
1da177e4 LT |
1612 | } |
1613 | ||
54abf37e | 1614 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
01a63aeb | 1615 | tape->merge_bh_size = 0; |
f2e3ab52 | 1616 | if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 | 1617 | ++count; |
ec0fdb01 | 1618 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1619 | } |
1620 | ||
1da177e4 | 1621 | switch (mt_op) { |
5a04cfa9 BP |
1622 | case MTFSF: |
1623 | case MTBSF: | |
1624 | idetape_create_space_cmd(&pc, mt_count - count, | |
1625 | IDETAPE_SPACE_OVER_FILEMARK); | |
1626 | return idetape_queue_pc_tail(drive, &pc); | |
1627 | case MTFSFM: | |
1628 | case MTBSFM: | |
1629 | if (!sprev) | |
1630 | return -EIO; | |
1631 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1632 | mt_count - count); | |
1633 | if (retval) | |
1634 | return retval; | |
1635 | count = (MTBSFM == mt_op ? 1 : -1); | |
1636 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1637 | default: | |
1638 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1639 | mt_op); | |
1640 | return -EIO; | |
1da177e4 LT |
1641 | } |
1642 | } | |
1643 | ||
1da177e4 | 1644 | /* |
3c98bf34 | 1645 | * Our character device read / write functions. |
1da177e4 | 1646 | * |
3c98bf34 BP |
1647 | * The tape is optimized to maximize throughput when it is transferring an |
1648 | * integral number of the "continuous transfer limit", which is a parameter of | |
1649 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1650 | * |
3c98bf34 BP |
1651 | * As of version 1.3 of the driver, the character device provides an abstract |
1652 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1653 | * same backup/restore procedure is supported. The driver will internally | |
1654 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1655 | * between the user's block size to the recommended size will only result in a | |
1656 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1657 | * This is not applicable to Onstream. | |
1da177e4 | 1658 | */ |
5a04cfa9 BP |
1659 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1660 | size_t count, loff_t *ppos) | |
1da177e4 LT |
1661 | { |
1662 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1663 | ide_drive_t *drive = tape->drive; | |
5a04cfa9 | 1664 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 1665 | ssize_t ret = 0; |
b6422013 | 1666 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 1667 | |
8004a8c9 | 1668 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1669 | |
54abf37e | 1670 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
f2e3ab52 | 1671 | if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) |
54bb2074 BP |
1672 | if (count > tape->blk_size && |
1673 | (count % tape->blk_size) == 0) | |
1674 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1675 | } |
83042b24 | 1676 | rc = idetape_init_read(drive); |
8d06bfad | 1677 | if (rc < 0) |
1da177e4 LT |
1678 | return rc; |
1679 | if (count == 0) | |
1680 | return (0); | |
01a63aeb BP |
1681 | if (tape->merge_bh_size) { |
1682 | actually_read = min((unsigned int)(tape->merge_bh_size), | |
5a04cfa9 | 1683 | (unsigned int)count); |
99d74e61 | 1684 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
dcd96379 | 1685 | ret = -EFAULT; |
1da177e4 | 1686 | buf += actually_read; |
01a63aeb | 1687 | tape->merge_bh_size -= actually_read; |
1da177e4 LT |
1688 | count -= actually_read; |
1689 | } | |
f73850a3 | 1690 | while (count >= tape->buffer_size) { |
b6422013 | 1691 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1692 | if (bytes_read <= 0) |
1693 | goto finish; | |
99d74e61 | 1694 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
dcd96379 | 1695 | ret = -EFAULT; |
1da177e4 LT |
1696 | buf += bytes_read; |
1697 | count -= bytes_read; | |
1698 | actually_read += bytes_read; | |
1699 | } | |
1700 | if (count) { | |
b6422013 | 1701 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1702 | if (bytes_read <= 0) |
1703 | goto finish; | |
1704 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
99d74e61 | 1705 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
dcd96379 | 1706 | ret = -EFAULT; |
1da177e4 | 1707 | actually_read += temp; |
01a63aeb | 1708 | tape->merge_bh_size = bytes_read-temp; |
1da177e4 LT |
1709 | } |
1710 | finish: | |
f2e3ab52 | 1711 | if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { |
8004a8c9 BP |
1712 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1713 | ||
1da177e4 LT |
1714 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1715 | return 0; | |
1716 | } | |
dcd96379 | 1717 | |
5a04cfa9 | 1718 | return ret ? ret : actually_read; |
1da177e4 LT |
1719 | } |
1720 | ||
5a04cfa9 | 1721 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1722 | size_t count, loff_t *ppos) |
1723 | { | |
1724 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1725 | ide_drive_t *drive = tape->drive; | |
dcd96379 DW |
1726 | ssize_t actually_written = 0; |
1727 | ssize_t ret = 0; | |
b6422013 | 1728 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
1729 | |
1730 | /* The drive is write protected. */ | |
1731 | if (tape->write_prot) | |
1732 | return -EACCES; | |
1733 | ||
8004a8c9 | 1734 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1735 | |
1736 | /* Initialize write operation */ | |
54abf37e BP |
1737 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
1738 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1739 | ide_tape_discard_merge_buffer(drive, 1); |
077e3bdb | 1740 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1741 | printk(KERN_ERR "ide-tape: merge_bh_size " |
1da177e4 | 1742 | "should be 0 now\n"); |
01a63aeb | 1743 | tape->merge_bh_size = 0; |
1da177e4 | 1744 | } |
077e3bdb BP |
1745 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1746 | if (!tape->merge_bh) | |
1da177e4 | 1747 | return -ENOMEM; |
54abf37e | 1748 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
077e3bdb | 1749 | idetape_init_merge_buffer(tape); |
1da177e4 LT |
1750 | |
1751 | /* | |
3c98bf34 BP |
1752 | * Issue a write 0 command to ensure that DSC handshake is |
1753 | * switched from completion mode to buffer available mode. No | |
1754 | * point in issuing this if DSC overlap isn't supported, some | |
1755 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1756 | */ |
1757 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1758 | ssize_t retval = idetape_queue_rw_tail(drive, |
1759 | REQ_IDETAPE_WRITE, 0, | |
077e3bdb | 1760 | tape->merge_bh); |
1da177e4 | 1761 | if (retval < 0) { |
077e3bdb BP |
1762 | ide_tape_kfree_buffer(tape); |
1763 | tape->merge_bh = NULL; | |
54abf37e | 1764 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1765 | return retval; |
1766 | } | |
1767 | } | |
1768 | } | |
1769 | if (count == 0) | |
1770 | return (0); | |
01a63aeb BP |
1771 | if (tape->merge_bh_size) { |
1772 | if (tape->merge_bh_size >= tape->buffer_size) { | |
5a04cfa9 | 1773 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
01a63aeb | 1774 | tape->merge_bh_size = 0; |
1da177e4 | 1775 | } |
5a04cfa9 | 1776 | actually_written = min((unsigned int) |
01a63aeb | 1777 | (tape->buffer_size - tape->merge_bh_size), |
5a04cfa9 | 1778 | (unsigned int)count); |
8646c88f | 1779 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
dcd96379 | 1780 | ret = -EFAULT; |
1da177e4 | 1781 | buf += actually_written; |
01a63aeb | 1782 | tape->merge_bh_size += actually_written; |
1da177e4 LT |
1783 | count -= actually_written; |
1784 | ||
01a63aeb | 1785 | if (tape->merge_bh_size == tape->buffer_size) { |
dcd96379 | 1786 | ssize_t retval; |
01a63aeb | 1787 | tape->merge_bh_size = 0; |
b6422013 | 1788 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
1789 | if (retval <= 0) |
1790 | return (retval); | |
1791 | } | |
1792 | } | |
f73850a3 | 1793 | while (count >= tape->buffer_size) { |
dcd96379 | 1794 | ssize_t retval; |
f73850a3 | 1795 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
dcd96379 | 1796 | ret = -EFAULT; |
f73850a3 BP |
1797 | buf += tape->buffer_size; |
1798 | count -= tape->buffer_size; | |
b6422013 | 1799 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 1800 | actually_written += tape->buffer_size; |
1da177e4 LT |
1801 | if (retval <= 0) |
1802 | return (retval); | |
1803 | } | |
1804 | if (count) { | |
1805 | actually_written += count; | |
8646c88f | 1806 | if (idetape_copy_stage_from_user(tape, buf, count)) |
dcd96379 | 1807 | ret = -EFAULT; |
01a63aeb | 1808 | tape->merge_bh_size += count; |
1da177e4 | 1809 | } |
5a04cfa9 | 1810 | return ret ? ret : actually_written; |
1da177e4 LT |
1811 | } |
1812 | ||
5a04cfa9 | 1813 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1814 | { |
d236d74c | 1815 | struct ide_atapi_pc pc; |
1da177e4 LT |
1816 | |
1817 | /* Write a filemark */ | |
1818 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
1819 | if (idetape_queue_pc_tail(drive, &pc)) { | |
1820 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); | |
1821 | return -EIO; | |
1822 | } | |
1823 | return 0; | |
1824 | } | |
1825 | ||
1826 | /* | |
d99c9da2 BP |
1827 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1828 | * requested. | |
1da177e4 | 1829 | * |
d99c9da2 BP |
1830 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1831 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1832 | * usually not supported. |
1da177e4 | 1833 | * |
d99c9da2 | 1834 | * The following commands are currently not supported: |
1da177e4 | 1835 | * |
d99c9da2 BP |
1836 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1837 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1838 | */ |
d99c9da2 | 1839 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1840 | { |
1841 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1842 | struct ide_atapi_pc pc; |
5a04cfa9 | 1843 | int i, retval; |
1da177e4 | 1844 | |
8004a8c9 BP |
1845 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
1846 | mt_op, mt_count); | |
5a04cfa9 | 1847 | |
1da177e4 | 1848 | switch (mt_op) { |
5a04cfa9 BP |
1849 | case MTFSF: |
1850 | case MTFSFM: | |
1851 | case MTBSF: | |
1852 | case MTBSFM: | |
1853 | if (!mt_count) | |
1854 | return 0; | |
1855 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1856 | default: | |
1857 | break; | |
1da177e4 | 1858 | } |
5a04cfa9 | 1859 | |
1da177e4 | 1860 | switch (mt_op) { |
5a04cfa9 BP |
1861 | case MTWEOF: |
1862 | if (tape->write_prot) | |
1863 | return -EACCES; | |
ec0fdb01 | 1864 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1865 | for (i = 0; i < mt_count; i++) { |
1866 | retval = idetape_write_filemark(drive); | |
1867 | if (retval) | |
1868 | return retval; | |
1869 | } | |
1870 | return 0; | |
1871 | case MTREW: | |
ec0fdb01 | 1872 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1873 | if (idetape_rewind_tape(drive)) |
1874 | return -EIO; | |
1875 | return 0; | |
1876 | case MTLOAD: | |
ec0fdb01 | 1877 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1878 | idetape_create_load_unload_cmd(drive, &pc, |
1879 | IDETAPE_LU_LOAD_MASK); | |
1880 | return idetape_queue_pc_tail(drive, &pc); | |
1881 | case MTUNLOAD: | |
1882 | case MTOFFL: | |
1883 | /* | |
1884 | * If door is locked, attempt to unlock before | |
1885 | * attempting to eject. | |
1886 | */ | |
1887 | if (tape->door_locked) { | |
385a4b87 BZ |
1888 | if (!ide_tape_set_media_lock(drive, 0)) |
1889 | tape->door_locked = DOOR_UNLOCKED; | |
5a04cfa9 | 1890 | } |
ec0fdb01 | 1891 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1892 | idetape_create_load_unload_cmd(drive, &pc, |
1893 | !IDETAPE_LU_LOAD_MASK); | |
1894 | retval = idetape_queue_pc_tail(drive, &pc); | |
1895 | if (!retval) | |
f2e3ab52 | 1896 | clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
5a04cfa9 BP |
1897 | return retval; |
1898 | case MTNOP: | |
ec0fdb01 | 1899 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1900 | return idetape_flush_tape_buffers(drive); |
1901 | case MTRETEN: | |
ec0fdb01 | 1902 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1903 | idetape_create_load_unload_cmd(drive, &pc, |
1904 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); | |
1905 | return idetape_queue_pc_tail(drive, &pc); | |
1906 | case MTEOM: | |
1907 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
1908 | return idetape_queue_pc_tail(drive, &pc); | |
1909 | case MTERASE: | |
1910 | (void)idetape_rewind_tape(drive); | |
1911 | idetape_create_erase_cmd(&pc); | |
1912 | return idetape_queue_pc_tail(drive, &pc); | |
1913 | case MTSETBLK: | |
1914 | if (mt_count) { | |
1915 | if (mt_count < tape->blk_size || | |
1916 | mt_count % tape->blk_size) | |
1da177e4 | 1917 | return -EIO; |
5a04cfa9 | 1918 | tape->user_bs_factor = mt_count / tape->blk_size; |
f2e3ab52 | 1919 | clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 | 1920 | } else |
f2e3ab52 | 1921 | set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 BP |
1922 | return 0; |
1923 | case MTSEEK: | |
ec0fdb01 | 1924 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1925 | return idetape_position_tape(drive, |
1926 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1927 | case MTSETPART: | |
ec0fdb01 | 1928 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1929 | return idetape_position_tape(drive, 0, mt_count, 0); |
1930 | case MTFSR: | |
1931 | case MTBSR: | |
1932 | case MTLOCK: | |
385a4b87 | 1933 | retval = ide_tape_set_media_lock(drive, 1); |
5a04cfa9 | 1934 | if (retval) |
1da177e4 | 1935 | return retval; |
5a04cfa9 BP |
1936 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1937 | return 0; | |
1938 | case MTUNLOCK: | |
385a4b87 | 1939 | retval = ide_tape_set_media_lock(drive, 0); |
5a04cfa9 BP |
1940 | if (retval) |
1941 | return retval; | |
1942 | tape->door_locked = DOOR_UNLOCKED; | |
1943 | return 0; | |
1944 | default: | |
1945 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1946 | mt_op); | |
1947 | return -EIO; | |
1da177e4 LT |
1948 | } |
1949 | } | |
1950 | ||
1951 | /* | |
d99c9da2 BP |
1952 | * Our character device ioctls. General mtio.h magnetic io commands are |
1953 | * supported here, and not in the corresponding block interface. Our own | |
1954 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 1955 | */ |
d99c9da2 BP |
1956 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
1957 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
1958 | { |
1959 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1960 | ide_drive_t *drive = tape->drive; | |
1961 | struct mtop mtop; | |
1962 | struct mtget mtget; | |
1963 | struct mtpos mtpos; | |
54bb2074 | 1964 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
1965 | void __user *argp = (void __user *)arg; |
1966 | ||
8004a8c9 | 1967 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 1968 | |
54abf37e | 1969 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 1970 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1971 | idetape_flush_tape_buffers(drive); |
1972 | } | |
1973 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
01a63aeb | 1974 | block_offset = tape->merge_bh_size / |
54bb2074 | 1975 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
1976 | position = idetape_read_position(drive); |
1977 | if (position < 0) | |
1da177e4 LT |
1978 | return -EIO; |
1979 | } | |
1980 | switch (cmd) { | |
5a04cfa9 BP |
1981 | case MTIOCTOP: |
1982 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
1983 | return -EFAULT; | |
1984 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
1985 | case MTIOCGET: | |
1986 | memset(&mtget, 0, sizeof(struct mtget)); | |
1987 | mtget.mt_type = MT_ISSCSI2; | |
1988 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1989 | mtget.mt_dsreg = | |
1990 | ((tape->blk_size * tape->user_bs_factor) | |
1991 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
1992 | ||
1993 | if (tape->drv_write_prot) | |
1994 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
1995 | ||
1996 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
1997 | return -EFAULT; | |
1998 | return 0; | |
1999 | case MTIOCPOS: | |
2000 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2001 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
2002 | return -EFAULT; | |
2003 | return 0; | |
2004 | default: | |
2005 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 2006 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 2007 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
2008 | } |
2009 | } | |
2010 | ||
3cffb9ce BP |
2011 | /* |
2012 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
2013 | * block size with the reported value. | |
2014 | */ | |
2015 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
2016 | { | |
2017 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2018 | struct ide_atapi_pc pc; |
3cffb9ce BP |
2019 | |
2020 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2021 | if (idetape_queue_pc_tail(drive, &pc)) { | |
2022 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); | |
54bb2074 | 2023 | if (tape->blk_size == 0) { |
3cffb9ce BP |
2024 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
2025 | "block size, assuming 32k\n"); | |
54bb2074 | 2026 | tape->blk_size = 32768; |
3cffb9ce BP |
2027 | } |
2028 | return; | |
2029 | } | |
d236d74c BP |
2030 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
2031 | (pc.buf[4 + 6] << 8) + | |
2032 | pc.buf[4 + 7]; | |
2033 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 2034 | } |
1da177e4 | 2035 | |
5a04cfa9 | 2036 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
2037 | { |
2038 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
2039 | ide_drive_t *drive; | |
2040 | idetape_tape_t *tape; | |
1da177e4 LT |
2041 | int retval; |
2042 | ||
8004a8c9 BP |
2043 | if (i >= MAX_HWIFS * MAX_DRIVES) |
2044 | return -ENXIO; | |
2045 | ||
04f4ac9d | 2046 | lock_kernel(); |
8004a8c9 | 2047 | tape = ide_tape_chrdev_get(i); |
04f4ac9d JC |
2048 | if (!tape) { |
2049 | unlock_kernel(); | |
8004a8c9 | 2050 | return -ENXIO; |
04f4ac9d | 2051 | } |
8004a8c9 BP |
2052 | |
2053 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
2054 | ||
1da177e4 LT |
2055 | /* |
2056 | * We really want to do nonseekable_open(inode, filp); here, but some | |
2057 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
2058 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
2059 | */ | |
2060 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
2061 | ||
1da177e4 LT |
2062 | drive = tape->drive; |
2063 | ||
2064 | filp->private_data = tape; | |
2065 | ||
f2e3ab52 | 2066 | if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { |
1da177e4 LT |
2067 | retval = -EBUSY; |
2068 | goto out_put_tape; | |
2069 | } | |
2070 | ||
2071 | retval = idetape_wait_ready(drive, 60 * HZ); | |
2072 | if (retval) { | |
f2e3ab52 | 2073 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2074 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
2075 | goto out_put_tape; | |
2076 | } | |
2077 | ||
2078 | idetape_read_position(drive); | |
f2e3ab52 | 2079 | if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) |
1da177e4 LT |
2080 | (void)idetape_rewind_tape(drive); |
2081 | ||
1da177e4 | 2082 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 2083 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
2084 | |
2085 | /* Set write protect flag if device is opened as read-only. */ | |
2086 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
2087 | tape->write_prot = 1; | |
2088 | else | |
2089 | tape->write_prot = tape->drv_write_prot; | |
2090 | ||
2091 | /* Make sure drive isn't write protected if user wants to write. */ | |
2092 | if (tape->write_prot) { | |
2093 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
2094 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
f2e3ab52 | 2095 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2096 | retval = -EROFS; |
2097 | goto out_put_tape; | |
2098 | } | |
2099 | } | |
2100 | ||
3c98bf34 | 2101 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 2102 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
385a4b87 BZ |
2103 | if (!ide_tape_set_media_lock(drive, 1)) { |
2104 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) | |
2105 | tape->door_locked = DOOR_LOCKED; | |
1da177e4 LT |
2106 | } |
2107 | } | |
04f4ac9d | 2108 | unlock_kernel(); |
1da177e4 LT |
2109 | return 0; |
2110 | ||
2111 | out_put_tape: | |
2112 | ide_tape_put(tape); | |
04f4ac9d | 2113 | unlock_kernel(); |
1da177e4 LT |
2114 | return retval; |
2115 | } | |
2116 | ||
5a04cfa9 | 2117 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
2118 | { |
2119 | idetape_tape_t *tape = drive->driver_data; | |
2120 | ||
d9df937a | 2121 | ide_tape_flush_merge_buffer(drive); |
077e3bdb BP |
2122 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); |
2123 | if (tape->merge_bh != NULL) { | |
54bb2074 BP |
2124 | idetape_pad_zeros(drive, tape->blk_size * |
2125 | (tape->user_bs_factor - 1)); | |
077e3bdb BP |
2126 | ide_tape_kfree_buffer(tape); |
2127 | tape->merge_bh = NULL; | |
1da177e4 LT |
2128 | } |
2129 | idetape_write_filemark(drive); | |
2130 | idetape_flush_tape_buffers(drive); | |
2131 | idetape_flush_tape_buffers(drive); | |
2132 | } | |
2133 | ||
5a04cfa9 | 2134 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 LT |
2135 | { |
2136 | struct ide_tape_obj *tape = ide_tape_f(filp); | |
2137 | ide_drive_t *drive = tape->drive; | |
1da177e4 LT |
2138 | unsigned int minor = iminor(inode); |
2139 | ||
2140 | lock_kernel(); | |
2141 | tape = drive->driver_data; | |
8004a8c9 BP |
2142 | |
2143 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 2144 | |
54abf37e | 2145 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 2146 | idetape_write_release(drive, minor); |
54abf37e | 2147 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 2148 | if (minor < 128) |
ec0fdb01 | 2149 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 2150 | } |
f64eee7b | 2151 | |
f2e3ab52 | 2152 | if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) |
1da177e4 | 2153 | (void) idetape_rewind_tape(drive); |
54abf37e | 2154 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 | 2155 | if (tape->door_locked == DOOR_LOCKED) { |
385a4b87 BZ |
2156 | if (!ide_tape_set_media_lock(drive, 0)) |
2157 | tape->door_locked = DOOR_UNLOCKED; | |
1da177e4 LT |
2158 | } |
2159 | } | |
f2e3ab52 | 2160 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2161 | ide_tape_put(tape); |
2162 | unlock_kernel(); | |
2163 | return 0; | |
2164 | } | |
2165 | ||
6d29c8f0 | 2166 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 2167 | { |
1da177e4 | 2168 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 2169 | struct ide_atapi_pc pc; |
801bd32e | 2170 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 2171 | |
1da177e4 LT |
2172 | idetape_create_inquiry_cmd(&pc); |
2173 | if (idetape_queue_pc_tail(drive, &pc)) { | |
6d29c8f0 BP |
2174 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
2175 | tape->name); | |
1da177e4 LT |
2176 | return; |
2177 | } | |
d236d74c BP |
2178 | memcpy(vendor_id, &pc.buf[8], 8); |
2179 | memcpy(product_id, &pc.buf[16], 16); | |
2180 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 | 2181 | |
801bd32e BP |
2182 | ide_fixstring(vendor_id, 8, 0); |
2183 | ide_fixstring(product_id, 16, 0); | |
2184 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 2185 | |
801bd32e | 2186 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 2187 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
2188 | } |
2189 | ||
2190 | /* | |
b6422013 BP |
2191 | * Ask the tape about its various parameters. In particular, we will adjust our |
2192 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 2193 | */ |
5a04cfa9 | 2194 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
2195 | { |
2196 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2197 | struct ide_atapi_pc pc; |
b6422013 BP |
2198 | u8 *caps; |
2199 | u8 speed, max_speed; | |
47314fa4 | 2200 | |
1da177e4 LT |
2201 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2202 | if (idetape_queue_pc_tail(drive, &pc)) { | |
b6422013 BP |
2203 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
2204 | " some default values\n"); | |
54bb2074 | 2205 | tape->blk_size = 512; |
b6422013 BP |
2206 | put_unaligned(52, (u16 *)&tape->caps[12]); |
2207 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2208 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
2209 | return; |
2210 | } | |
d236d74c | 2211 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
2212 | |
2213 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
2214 | speed = be16_to_cpup((__be16 *)&caps[14]); |
2215 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 2216 | |
cd740ab0 HH |
2217 | *(u16 *)&caps[8] = max_speed; |
2218 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
2219 | *(u16 *)&caps[14] = speed; | |
2220 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 2221 | |
b6422013 BP |
2222 | if (!speed) { |
2223 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2224 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2225 | *(u16 *)&caps[14] = 650; |
1da177e4 | 2226 | } |
b6422013 BP |
2227 | if (!max_speed) { |
2228 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2229 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2230 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
2231 | } |
2232 | ||
b6422013 BP |
2233 | memcpy(&tape->caps, caps, 20); |
2234 | if (caps[7] & 0x02) | |
54bb2074 | 2235 | tape->blk_size = 512; |
b6422013 | 2236 | else if (caps[7] & 0x04) |
54bb2074 | 2237 | tape->blk_size = 1024; |
1da177e4 LT |
2238 | } |
2239 | ||
7662d046 | 2240 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
2241 | #define ide_tape_devset_get(name, field) \ |
2242 | static int get_##name(ide_drive_t *drive) \ | |
2243 | { \ | |
2244 | idetape_tape_t *tape = drive->driver_data; \ | |
2245 | return tape->field; \ | |
2246 | } | |
2247 | ||
2248 | #define ide_tape_devset_set(name, field) \ | |
2249 | static int set_##name(ide_drive_t *drive, int arg) \ | |
2250 | { \ | |
2251 | idetape_tape_t *tape = drive->driver_data; \ | |
2252 | tape->field = arg; \ | |
2253 | return 0; \ | |
2254 | } | |
2255 | ||
2256 | #define ide_tape_devset_rw(_name, _min, _max, _field, _mulf, _divf) \ | |
2257 | ide_tape_devset_get(_name, _field) \ | |
2258 | ide_tape_devset_set(_name, _field) \ | |
2259 | __IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name, _mulf, _divf) | |
2260 | ||
2261 | #define ide_tape_devset_r(_name, _min, _max, _field, _mulf, _divf) \ | |
2262 | ide_tape_devset_get(_name, _field) \ | |
2263 | __IDE_DEVSET(_name, S_READ, _min, _max, get_##_name, NULL, _mulf, _divf) | |
2264 | ||
2265 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
2266 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
2267 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
2268 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
2269 | ||
2270 | ide_devset_rw(dsc_overlap, 0, 1, dsc_overlap); | |
2271 | ||
2272 | ide_tape_devset_rw(debug_mask, 0, 0xffff, debug_mask, NULL, NULL); | |
2273 | ide_tape_devset_rw(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
2274 | best_dsc_rw_freq, mulf_tdsc, divf_tdsc); | |
2275 | ||
2276 | ide_tape_devset_r(avg_speed, 0, 0xffff, avg_speed, NULL, NULL); | |
2277 | ide_tape_devset_r(speed, 0, 0xffff, caps[14], NULL, NULL); | |
2278 | ide_tape_devset_r(buffer, 0, 0xffff, caps[16], NULL, divf_buffer); | |
2279 | ide_tape_devset_r(buffer_size, 0, 0xffff, buffer_size, NULL, divf_buffer_size); | |
2280 | ||
2281 | static const struct ide_devset *idetape_settings[] = { | |
2282 | &ide_devset_avg_speed, | |
2283 | &ide_devset_buffer, | |
2284 | &ide_devset_buffer_size, | |
2285 | &ide_devset_debug_mask, | |
2286 | &ide_devset_dsc_overlap, | |
2287 | &ide_devset_speed, | |
2288 | &ide_devset_tdsc, | |
2289 | NULL | |
2290 | }; | |
7662d046 | 2291 | #endif |
1da177e4 LT |
2292 | |
2293 | /* | |
3c98bf34 | 2294 | * The function below is called to: |
1da177e4 | 2295 | * |
3c98bf34 BP |
2296 | * 1. Initialize our various state variables. |
2297 | * 2. Ask the tape for its capabilities. | |
2298 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2299 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 2300 | * |
3c98bf34 BP |
2301 | * Note that at this point ide.c already assigned us an irq, so that we can |
2302 | * queue requests here and wait for their completion. | |
1da177e4 | 2303 | */ |
5a04cfa9 | 2304 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 2305 | { |
83042b24 | 2306 | unsigned long t; |
1da177e4 | 2307 | int speed; |
f73850a3 | 2308 | int buffer_size; |
71071b8e | 2309 | u8 gcw[2]; |
b6422013 | 2310 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 2311 | |
776bb027 BP |
2312 | drive->pc_callback = ide_tape_callback; |
2313 | ||
54bb2074 | 2314 | spin_lock_init(&tape->lock); |
1da177e4 | 2315 | drive->dsc_overlap = 1; |
4166c199 BZ |
2316 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
2317 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2318 | tape->name); | |
2319 | drive->dsc_overlap = 0; | |
1da177e4 | 2320 | } |
1da177e4 | 2321 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 2322 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
1da177e4 LT |
2323 | drive->dsc_overlap = 0; |
2324 | tape->minor = minor; | |
2325 | tape->name[0] = 'h'; | |
2326 | tape->name[1] = 't'; | |
2327 | tape->name[2] = '0' + minor; | |
54abf37e | 2328 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
4dde4492 BZ |
2329 | |
2330 | *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG]; | |
71071b8e BP |
2331 | |
2332 | /* Command packet DRQ type */ | |
2333 | if (((gcw[0] & 0x60) >> 5) == 1) | |
f2e3ab52 | 2334 | set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags); |
1da177e4 | 2335 | |
1da177e4 LT |
2336 | idetape_get_inquiry_results(drive); |
2337 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 2338 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 2339 | tape->user_bs_factor = 1; |
f73850a3 BP |
2340 | tape->buffer_size = *ctl * tape->blk_size; |
2341 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 2342 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 2343 | *ctl /= 2; |
f73850a3 | 2344 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 2345 | } |
f73850a3 | 2346 | buffer_size = tape->buffer_size; |
a997a435 | 2347 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
f73850a3 | 2348 | if (buffer_size % PAGE_SIZE) { |
a997a435 | 2349 | tape->pages_per_buffer++; |
f73850a3 | 2350 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
1da177e4 LT |
2351 | } |
2352 | ||
83042b24 | 2353 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 2354 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 2355 | |
f73850a3 | 2356 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
2357 | |
2358 | /* | |
3c98bf34 BP |
2359 | * Ensure that the number we got makes sense; limit it within |
2360 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 2361 | */ |
a792bd5a HH |
2362 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
2363 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 2364 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 2365 | "%lums tDSC%s\n", |
b6422013 | 2366 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
2367 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
2368 | tape->buffer_size / 1024, | |
54bb2074 | 2369 | tape->best_dsc_rw_freq * 1000 / HZ, |
1da177e4 LT |
2370 | drive->using_dma ? ", DMA":""); |
2371 | ||
1e874f44 | 2372 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
2373 | } |
2374 | ||
4031bbe4 | 2375 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
2376 | { |
2377 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 2378 | |
7662d046 | 2379 | ide_proc_unregister_driver(drive, tape->driver); |
1da177e4 LT |
2380 | |
2381 | ide_unregister_region(tape->disk); | |
2382 | ||
2383 | ide_tape_put(tape); | |
1da177e4 LT |
2384 | } |
2385 | ||
2386 | static void ide_tape_release(struct kref *kref) | |
2387 | { | |
2388 | struct ide_tape_obj *tape = to_ide_tape(kref); | |
2389 | ide_drive_t *drive = tape->drive; | |
2390 | struct gendisk *g = tape->disk; | |
2391 | ||
01a63aeb | 2392 | BUG_ON(tape->merge_bh_size); |
8604affd | 2393 | |
1da177e4 LT |
2394 | drive->dsc_overlap = 0; |
2395 | drive->driver_data = NULL; | |
dbc1272e | 2396 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
2397 | device_destroy(idetape_sysfs_class, |
2398 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
2399 | idetape_devs[tape->minor] = NULL; |
2400 | g->private_data = NULL; | |
2401 | put_disk(g); | |
2402 | kfree(tape); | |
2403 | } | |
2404 | ||
ecfd80e4 | 2405 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
2406 | static int proc_idetape_read_name |
2407 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2408 | { | |
2409 | ide_drive_t *drive = (ide_drive_t *) data; | |
2410 | idetape_tape_t *tape = drive->driver_data; | |
2411 | char *out = page; | |
2412 | int len; | |
2413 | ||
2414 | len = sprintf(out, "%s\n", tape->name); | |
2415 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2416 | } | |
2417 | ||
2418 | static ide_proc_entry_t idetape_proc[] = { | |
2419 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2420 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2421 | { NULL, 0, NULL, NULL } | |
2422 | }; | |
1da177e4 LT |
2423 | #endif |
2424 | ||
4031bbe4 | 2425 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 2426 | |
1da177e4 | 2427 | static ide_driver_t idetape_driver = { |
8604affd | 2428 | .gen_driver = { |
4ef3b8f4 | 2429 | .owner = THIS_MODULE, |
8604affd BZ |
2430 | .name = "ide-tape", |
2431 | .bus = &ide_bus_type, | |
8604affd | 2432 | }, |
4031bbe4 RK |
2433 | .probe = ide_tape_probe, |
2434 | .remove = ide_tape_remove, | |
1da177e4 LT |
2435 | .version = IDETAPE_VERSION, |
2436 | .media = ide_tape, | |
1da177e4 LT |
2437 | .do_request = idetape_do_request, |
2438 | .end_request = idetape_end_request, | |
2439 | .error = __ide_error, | |
7662d046 | 2440 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 | 2441 | .proc = idetape_proc, |
8185d5aa | 2442 | .settings = idetape_settings, |
7662d046 | 2443 | #endif |
1da177e4 LT |
2444 | }; |
2445 | ||
3c98bf34 | 2446 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 2447 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
2448 | .owner = THIS_MODULE, |
2449 | .read = idetape_chrdev_read, | |
2450 | .write = idetape_chrdev_write, | |
2451 | .ioctl = idetape_chrdev_ioctl, | |
2452 | .open = idetape_chrdev_open, | |
2453 | .release = idetape_chrdev_release, | |
2454 | }; | |
2455 | ||
2456 | static int idetape_open(struct inode *inode, struct file *filp) | |
2457 | { | |
2458 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2459 | struct ide_tape_obj *tape; | |
1da177e4 | 2460 | |
5a04cfa9 BP |
2461 | tape = ide_tape_get(disk); |
2462 | if (!tape) | |
1da177e4 LT |
2463 | return -ENXIO; |
2464 | ||
1da177e4 LT |
2465 | return 0; |
2466 | } | |
2467 | ||
2468 | static int idetape_release(struct inode *inode, struct file *filp) | |
2469 | { | |
2470 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2471 | struct ide_tape_obj *tape = ide_tape_g(disk); | |
1da177e4 LT |
2472 | |
2473 | ide_tape_put(tape); | |
2474 | ||
2475 | return 0; | |
2476 | } | |
2477 | ||
2478 | static int idetape_ioctl(struct inode *inode, struct file *file, | |
2479 | unsigned int cmd, unsigned long arg) | |
2480 | { | |
2481 | struct block_device *bdev = inode->i_bdev; | |
2482 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); | |
2483 | ide_drive_t *drive = tape->drive; | |
2484 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); | |
2485 | if (err == -EINVAL) | |
2486 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2487 | return err; | |
2488 | } | |
2489 | ||
2490 | static struct block_device_operations idetape_block_ops = { | |
2491 | .owner = THIS_MODULE, | |
2492 | .open = idetape_open, | |
2493 | .release = idetape_release, | |
2494 | .ioctl = idetape_ioctl, | |
2495 | }; | |
2496 | ||
4031bbe4 | 2497 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2498 | { |
2499 | idetape_tape_t *tape; | |
2500 | struct gendisk *g; | |
2501 | int minor; | |
2502 | ||
2503 | if (!strstr("ide-tape", drive->driver_req)) | |
2504 | goto failed; | |
2a924662 | 2505 | |
1da177e4 LT |
2506 | if (drive->media != ide_tape) |
2507 | goto failed; | |
2a924662 | 2508 | |
51509eec | 2509 | if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) { |
5a04cfa9 BP |
2510 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
2511 | " the driver\n", drive->name); | |
1da177e4 LT |
2512 | goto failed; |
2513 | } | |
5a04cfa9 | 2514 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2515 | if (tape == NULL) { |
5a04cfa9 BP |
2516 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2517 | drive->name); | |
1da177e4 LT |
2518 | goto failed; |
2519 | } | |
2520 | ||
2521 | g = alloc_disk(1 << PARTN_BITS); | |
2522 | if (!g) | |
2523 | goto out_free_tape; | |
2524 | ||
2525 | ide_init_disk(g, drive); | |
2526 | ||
1da177e4 LT |
2527 | kref_init(&tape->kref); |
2528 | ||
2529 | tape->drive = drive; | |
2530 | tape->driver = &idetape_driver; | |
2531 | tape->disk = g; | |
2532 | ||
2533 | g->private_data = &tape->driver; | |
2534 | ||
2535 | drive->driver_data = tape; | |
2536 | ||
cf8b8975 | 2537 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2538 | for (minor = 0; idetape_devs[minor]; minor++) |
2539 | ; | |
2540 | idetape_devs[minor] = tape; | |
cf8b8975 | 2541 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2542 | |
2543 | idetape_setup(drive, tape, minor); | |
2544 | ||
6ecaaf94 GKH |
2545 | device_create_drvdata(idetape_sysfs_class, &drive->gendev, |
2546 | MKDEV(IDETAPE_MAJOR, minor), NULL, | |
2547 | "%s", tape->name); | |
2548 | device_create_drvdata(idetape_sysfs_class, &drive->gendev, | |
2549 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
2550 | "n%s", tape->name); | |
d5dee80a | 2551 | |
1da177e4 LT |
2552 | g->fops = &idetape_block_ops; |
2553 | ide_register_region(g); | |
2554 | ||
2555 | return 0; | |
8604affd | 2556 | |
1da177e4 LT |
2557 | out_free_tape: |
2558 | kfree(tape); | |
2559 | failed: | |
8604affd | 2560 | return -ENODEV; |
1da177e4 LT |
2561 | } |
2562 | ||
5a04cfa9 | 2563 | static void __exit idetape_exit(void) |
1da177e4 | 2564 | { |
8604affd | 2565 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2566 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2567 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2568 | } | |
2569 | ||
17514e8a | 2570 | static int __init idetape_init(void) |
1da177e4 | 2571 | { |
d5dee80a WD |
2572 | int error = 1; |
2573 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2574 | if (IS_ERR(idetape_sysfs_class)) { | |
2575 | idetape_sysfs_class = NULL; | |
2576 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2577 | error = -EBUSY; | |
2578 | goto out; | |
2579 | } | |
2580 | ||
1da177e4 | 2581 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2582 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2583 | " interface\n"); | |
d5dee80a WD |
2584 | error = -EBUSY; |
2585 | goto out_free_class; | |
1da177e4 | 2586 | } |
d5dee80a WD |
2587 | |
2588 | error = driver_register(&idetape_driver.gen_driver); | |
2589 | if (error) | |
2590 | goto out_free_driver; | |
2591 | ||
2592 | return 0; | |
2593 | ||
2594 | out_free_driver: | |
2595 | driver_unregister(&idetape_driver.gen_driver); | |
2596 | out_free_class: | |
2597 | class_destroy(idetape_sysfs_class); | |
2598 | out: | |
2599 | return error; | |
1da177e4 LT |
2600 | } |
2601 | ||
263756ec | 2602 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2603 | module_init(idetape_init); |
2604 | module_exit(idetape_exit); | |
2605 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2606 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2607 | MODULE_LICENSE("GPL"); |