Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
5ce78af4 BP |
2 | * IDE ATAPI streaming tape driver. |
3 | * | |
59bca8cc BZ |
4 | * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> |
5 | * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz | |
1da177e4 | 6 | * |
1da177e4 LT |
7 | * This driver was constructed as a student project in the software laboratory |
8 | * of the faculty of electrical engineering in the Technion - Israel's | |
9 | * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. | |
10 | * | |
11 | * It is hereby placed under the terms of the GNU general public license. | |
12 | * (See linux/COPYING). | |
1da177e4 | 13 | * |
5ce78af4 BP |
14 | * For a historical changelog see |
15 | * Documentation/ide/ChangeLog.ide-tape.1995-2002 | |
1da177e4 LT |
16 | */ |
17 | ||
51509eec BZ |
18 | #define DRV_NAME "ide-tape" |
19 | ||
dfe79936 | 20 | #define IDETAPE_VERSION "1.20" |
1da177e4 | 21 | |
1da177e4 LT |
22 | #include <linux/module.h> |
23 | #include <linux/types.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/timer.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/interrupt.h> | |
9bae1ff3 | 30 | #include <linux/jiffies.h> |
1da177e4 | 31 | #include <linux/major.h> |
1da177e4 LT |
32 | #include <linux/errno.h> |
33 | #include <linux/genhd.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/pci.h> | |
36 | #include <linux/ide.h> | |
37 | #include <linux/smp_lock.h> | |
38 | #include <linux/completion.h> | |
39 | #include <linux/bitops.h> | |
cf8b8975 | 40 | #include <linux/mutex.h> |
90699ce2 | 41 | #include <scsi/scsi.h> |
1da177e4 LT |
42 | |
43 | #include <asm/byteorder.h> | |
c837cfa5 BP |
44 | #include <linux/irq.h> |
45 | #include <linux/uaccess.h> | |
46 | #include <linux/io.h> | |
1da177e4 | 47 | #include <asm/unaligned.h> |
1da177e4 LT |
48 | #include <linux/mtio.h> |
49 | ||
8004a8c9 BP |
50 | enum { |
51 | /* output errors only */ | |
52 | DBG_ERR = (1 << 0), | |
53 | /* output all sense key/asc */ | |
54 | DBG_SENSE = (1 << 1), | |
55 | /* info regarding all chrdev-related procedures */ | |
56 | DBG_CHRDEV = (1 << 2), | |
57 | /* all remaining procedures */ | |
58 | DBG_PROCS = (1 << 3), | |
8004a8c9 BP |
59 | }; |
60 | ||
61 | /* define to see debug info */ | |
62 | #define IDETAPE_DEBUG_LOG 0 | |
63 | ||
64 | #if IDETAPE_DEBUG_LOG | |
65 | #define debug_log(lvl, fmt, args...) \ | |
66 | { \ | |
67 | if (tape->debug_mask & lvl) \ | |
68 | printk(KERN_INFO "ide-tape: " fmt, ## args); \ | |
69 | } | |
70 | #else | |
71 | #define debug_log(lvl, fmt, args...) do {} while (0) | |
72 | #endif | |
73 | ||
1da177e4 | 74 | /**************************** Tunable parameters *****************************/ |
1da177e4 | 75 | /* |
3c98bf34 BP |
76 | * After each failed packet command we issue a request sense command and retry |
77 | * the packet command IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 78 | * |
3c98bf34 | 79 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
1da177e4 LT |
80 | */ |
81 | #define IDETAPE_MAX_PC_RETRIES 3 | |
82 | ||
1da177e4 | 83 | /* |
3c98bf34 BP |
84 | * The following parameter is used to select the point in the internal tape fifo |
85 | * in which we will start to refill the buffer. Decreasing the following | |
86 | * parameter will improve the system's latency and interactive response, while | |
87 | * using a high value might improve system throughput. | |
1da177e4 | 88 | */ |
3c98bf34 | 89 | #define IDETAPE_FIFO_THRESHOLD 2 |
1da177e4 LT |
90 | |
91 | /* | |
3c98bf34 | 92 | * DSC polling parameters. |
1da177e4 | 93 | * |
3c98bf34 BP |
94 | * Polling for DSC (a single bit in the status register) is a very important |
95 | * function in ide-tape. There are two cases in which we poll for DSC: | |
1da177e4 | 96 | * |
3c98bf34 BP |
97 | * 1. Before a read/write packet command, to ensure that we can transfer data |
98 | * from/to the tape's data buffers, without causing an actual media access. | |
99 | * In case the tape is not ready yet, we take out our request from the device | |
100 | * request queue, so that ide.c could service requests from the other device | |
101 | * on the same interface in the meantime. | |
1da177e4 | 102 | * |
3c98bf34 BP |
103 | * 2. After the successful initialization of a "media access packet command", |
104 | * which is a command that can take a long time to complete (the interval can | |
105 | * range from several seconds to even an hour). Again, we postpone our request | |
106 | * in the middle to free the bus for the other device. The polling frequency | |
107 | * here should be lower than the read/write frequency since those media access | |
108 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST | |
109 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD | |
110 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). | |
1da177e4 | 111 | * |
3c98bf34 BP |
112 | * We also set a timeout for the timer, in case something goes wrong. The |
113 | * timeout should be longer then the maximum execution time of a tape operation. | |
1da177e4 | 114 | */ |
3c98bf34 BP |
115 | |
116 | /* DSC timings. */ | |
1da177e4 LT |
117 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
118 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ | |
119 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ | |
120 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ | |
121 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ | |
122 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ | |
123 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ | |
124 | ||
125 | /*************************** End of tunable parameters ***********************/ | |
126 | ||
54abf37e BP |
127 | /* tape directions */ |
128 | enum { | |
129 | IDETAPE_DIR_NONE = (1 << 0), | |
130 | IDETAPE_DIR_READ = (1 << 1), | |
131 | IDETAPE_DIR_WRITE = (1 << 2), | |
132 | }; | |
1da177e4 LT |
133 | |
134 | struct idetape_bh { | |
ab057968 | 135 | u32 b_size; |
1da177e4 LT |
136 | atomic_t b_count; |
137 | struct idetape_bh *b_reqnext; | |
138 | char *b_data; | |
139 | }; | |
140 | ||
03056b90 BP |
141 | /* Tape door status */ |
142 | #define DOOR_UNLOCKED 0 | |
143 | #define DOOR_LOCKED 1 | |
144 | #define DOOR_EXPLICITLY_LOCKED 2 | |
145 | ||
146 | /* Some defines for the SPACE command */ | |
147 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
148 | #define IDETAPE_SPACE_TO_EOD 3 | |
149 | ||
150 | /* Some defines for the LOAD UNLOAD command */ | |
151 | #define IDETAPE_LU_LOAD_MASK 1 | |
152 | #define IDETAPE_LU_RETENSION_MASK 2 | |
153 | #define IDETAPE_LU_EOT_MASK 4 | |
154 | ||
03056b90 BP |
155 | /* Error codes returned in rq->errors to the higher part of the driver. */ |
156 | #define IDETAPE_ERROR_GENERAL 101 | |
157 | #define IDETAPE_ERROR_FILEMARK 102 | |
158 | #define IDETAPE_ERROR_EOD 103 | |
159 | ||
160 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ | |
161 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
162 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
163 | ||
1da177e4 | 164 | /* |
3c98bf34 BP |
165 | * Most of our global data which we need to save even as we leave the driver due |
166 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
167 | */ |
168 | typedef struct ide_tape_obj { | |
169 | ide_drive_t *drive; | |
170 | ide_driver_t *driver; | |
171 | struct gendisk *disk; | |
172 | struct kref kref; | |
173 | ||
174 | /* | |
1da177e4 LT |
175 | * failed_pc points to the last failed packet command, or contains |
176 | * NULL if we do not need to retry any packet command. This is | |
177 | * required since an additional packet command is needed before the | |
178 | * retry, to get detailed information on what went wrong. | |
179 | */ | |
1da177e4 | 180 | /* Last failed packet command */ |
d236d74c | 181 | struct ide_atapi_pc *failed_pc; |
2e8a6f89 BZ |
182 | /* used by REQ_IDETAPE_{READ,WRITE} requests */ |
183 | struct ide_atapi_pc queued_pc; | |
394a4c21 | 184 | |
2e8a6f89 | 185 | struct ide_atapi_pc request_sense_pc; |
394a4c21 | 186 | struct request request_sense_rq; |
1da177e4 LT |
187 | |
188 | /* | |
3c98bf34 | 189 | * DSC polling variables. |
1da177e4 | 190 | * |
3c98bf34 BP |
191 | * While polling for DSC we use postponed_rq to postpone the current |
192 | * request so that ide.c will be able to service pending requests on the | |
193 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 194 | * data transfer) request in the device request queue. |
1da177e4 LT |
195 | */ |
196 | struct request *postponed_rq; | |
197 | /* The time in which we started polling for DSC */ | |
198 | unsigned long dsc_polling_start; | |
199 | /* Timer used to poll for dsc */ | |
200 | struct timer_list dsc_timer; | |
201 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
202 | unsigned long best_dsc_rw_freq; |
203 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
204 | unsigned long dsc_timeout; |
205 | ||
3c98bf34 | 206 | /* Read position information */ |
1da177e4 LT |
207 | u8 partition; |
208 | /* Current block */ | |
54bb2074 | 209 | unsigned int first_frame; |
1da177e4 | 210 | |
3c98bf34 | 211 | /* Last error information */ |
1da177e4 LT |
212 | u8 sense_key, asc, ascq; |
213 | ||
3c98bf34 | 214 | /* Character device operation */ |
1da177e4 LT |
215 | unsigned int minor; |
216 | /* device name */ | |
217 | char name[4]; | |
218 | /* Current character device data transfer direction */ | |
54abf37e | 219 | u8 chrdev_dir; |
1da177e4 | 220 | |
54bb2074 BP |
221 | /* tape block size, usually 512 or 1024 bytes */ |
222 | unsigned short blk_size; | |
1da177e4 | 223 | int user_bs_factor; |
b6422013 | 224 | |
1da177e4 | 225 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 226 | u8 caps[20]; |
1da177e4 LT |
227 | |
228 | /* | |
3c98bf34 | 229 | * Active data transfer request parameters. |
1da177e4 | 230 | * |
3c98bf34 BP |
231 | * At most, there is only one ide-tape originated data transfer request |
232 | * in the device request queue. This allows ide.c to easily service | |
233 | * requests from the other device when we postpone our active request. | |
1da177e4 | 234 | */ |
83042b24 | 235 | |
3c98bf34 | 236 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 237 | int buffer_size; |
077e3bdb BP |
238 | /* merge buffer */ |
239 | struct idetape_bh *merge_bh; | |
01a63aeb BP |
240 | /* size of the merge buffer */ |
241 | int merge_bh_size; | |
077e3bdb | 242 | /* pointer to current buffer head within the merge buffer */ |
1da177e4 LT |
243 | struct idetape_bh *bh; |
244 | char *b_data; | |
245 | int b_count; | |
3c98bf34 | 246 | |
a997a435 | 247 | int pages_per_buffer; |
1da177e4 LT |
248 | /* Wasted space in each stage */ |
249 | int excess_bh_size; | |
250 | ||
1da177e4 | 251 | /* protects the ide-tape queue */ |
54bb2074 | 252 | spinlock_t lock; |
1da177e4 | 253 | |
3c98bf34 | 254 | /* Measures average tape speed */ |
1da177e4 LT |
255 | unsigned long avg_time; |
256 | int avg_size; | |
257 | int avg_speed; | |
258 | ||
1da177e4 LT |
259 | /* the door is currently locked */ |
260 | int door_locked; | |
261 | /* the tape hardware is write protected */ | |
262 | char drv_write_prot; | |
263 | /* the tape is write protected (hardware or opened as read-only) */ | |
264 | char write_prot; | |
265 | ||
8004a8c9 | 266 | u32 debug_mask; |
1da177e4 LT |
267 | } idetape_tape_t; |
268 | ||
cf8b8975 | 269 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 270 | |
d5dee80a WD |
271 | static struct class *idetape_sysfs_class; |
272 | ||
1da177e4 LT |
273 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
274 | ||
275 | #define ide_tape_g(disk) \ | |
276 | container_of((disk)->private_data, struct ide_tape_obj, driver) | |
277 | ||
08da591e BZ |
278 | static void ide_tape_release(struct kref *); |
279 | ||
1da177e4 LT |
280 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
281 | { | |
282 | struct ide_tape_obj *tape = NULL; | |
283 | ||
cf8b8975 | 284 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 285 | tape = ide_tape_g(disk); |
08da591e | 286 | if (tape) { |
d3e33ff5 | 287 | if (ide_device_get(tape->drive)) |
08da591e | 288 | tape = NULL; |
d3e33ff5 BZ |
289 | else |
290 | kref_get(&tape->kref); | |
08da591e | 291 | } |
cf8b8975 | 292 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
293 | return tape; |
294 | } | |
295 | ||
1da177e4 LT |
296 | static void ide_tape_put(struct ide_tape_obj *tape) |
297 | { | |
d3e33ff5 BZ |
298 | ide_drive_t *drive = tape->drive; |
299 | ||
cf8b8975 | 300 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 301 | kref_put(&tape->kref, ide_tape_release); |
d3e33ff5 | 302 | ide_device_put(drive); |
cf8b8975 | 303 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
304 | } |
305 | ||
1da177e4 | 306 | /* |
3c98bf34 BP |
307 | * The variables below are used for the character device interface. Additional |
308 | * state variables are defined in our ide_drive_t structure. | |
1da177e4 | 309 | */ |
5a04cfa9 | 310 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
1da177e4 LT |
311 | |
312 | #define ide_tape_f(file) ((file)->private_data) | |
313 | ||
314 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) | |
315 | { | |
316 | struct ide_tape_obj *tape = NULL; | |
317 | ||
cf8b8975 | 318 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
319 | tape = idetape_devs[i]; |
320 | if (tape) | |
321 | kref_get(&tape->kref); | |
cf8b8975 | 322 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
323 | return tape; |
324 | } | |
325 | ||
d236d74c | 326 | static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 327 | unsigned int bcount) |
1da177e4 LT |
328 | { |
329 | struct idetape_bh *bh = pc->bh; | |
330 | int count; | |
331 | ||
332 | while (bcount) { | |
1da177e4 LT |
333 | if (bh == NULL) { |
334 | printk(KERN_ERR "ide-tape: bh == NULL in " | |
335 | "idetape_input_buffers\n"); | |
9f87abe8 | 336 | ide_pad_transfer(drive, 0, bcount); |
1da177e4 LT |
337 | return; |
338 | } | |
5a04cfa9 BP |
339 | count = min( |
340 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
341 | bcount); | |
374e042c | 342 | drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data + |
5a04cfa9 | 343 | atomic_read(&bh->b_count), count); |
1da177e4 LT |
344 | bcount -= count; |
345 | atomic_add(count, &bh->b_count); | |
346 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
347 | bh = bh->b_reqnext; | |
348 | if (bh) | |
349 | atomic_set(&bh->b_count, 0); | |
350 | } | |
351 | } | |
352 | pc->bh = bh; | |
353 | } | |
354 | ||
d236d74c | 355 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 356 | unsigned int bcount) |
1da177e4 LT |
357 | { |
358 | struct idetape_bh *bh = pc->bh; | |
359 | int count; | |
360 | ||
361 | while (bcount) { | |
1da177e4 | 362 | if (bh == NULL) { |
5a04cfa9 BP |
363 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
364 | __func__); | |
1da177e4 LT |
365 | return; |
366 | } | |
1da177e4 | 367 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
374e042c | 368 | drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); |
1da177e4 LT |
369 | bcount -= count; |
370 | pc->b_data += count; | |
371 | pc->b_count -= count; | |
372 | if (!pc->b_count) { | |
5a04cfa9 BP |
373 | bh = bh->b_reqnext; |
374 | pc->bh = bh; | |
1da177e4 LT |
375 | if (bh) { |
376 | pc->b_data = bh->b_data; | |
377 | pc->b_count = atomic_read(&bh->b_count); | |
378 | } | |
379 | } | |
380 | } | |
381 | } | |
382 | ||
646c0cb6 | 383 | static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
384 | { |
385 | struct idetape_bh *bh = pc->bh; | |
386 | int count; | |
d236d74c | 387 | unsigned int bcount = pc->xferred; |
1da177e4 | 388 | |
346331f8 | 389 | if (pc->flags & PC_FLAG_WRITING) |
1da177e4 LT |
390 | return; |
391 | while (bcount) { | |
1da177e4 | 392 | if (bh == NULL) { |
5a04cfa9 BP |
393 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
394 | __func__); | |
1da177e4 LT |
395 | return; |
396 | } | |
1da177e4 LT |
397 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
398 | atomic_set(&bh->b_count, count); | |
399 | if (atomic_read(&bh->b_count) == bh->b_size) | |
400 | bh = bh->b_reqnext; | |
401 | bcount -= count; | |
402 | } | |
403 | pc->bh = bh; | |
404 | } | |
405 | ||
1da177e4 | 406 | /* |
1b5db434 BP |
407 | * called on each failed packet command retry to analyze the request sense. We |
408 | * currently do not utilize this information. | |
1da177e4 | 409 | */ |
1b5db434 | 410 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
411 | { |
412 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 413 | struct ide_atapi_pc *pc = tape->failed_pc; |
1da177e4 | 414 | |
1b5db434 BP |
415 | tape->sense_key = sense[2] & 0xF; |
416 | tape->asc = sense[12]; | |
417 | tape->ascq = sense[13]; | |
8004a8c9 BP |
418 | |
419 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
420 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 421 | |
d236d74c | 422 | /* Correct pc->xferred by asking the tape. */ |
346331f8 | 423 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
d236d74c | 424 | pc->xferred = pc->req_xfer - |
54bb2074 | 425 | tape->blk_size * |
5d0cc8ae | 426 | get_unaligned_be32(&sense[3]); |
646c0cb6 | 427 | idetape_update_buffers(drive, pc); |
1da177e4 LT |
428 | } |
429 | ||
430 | /* | |
431 | * If error was the result of a zero-length read or write command, | |
432 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
433 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
434 | */ | |
90699ce2 | 435 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
436 | /* length == 0 */ |
437 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
438 | if (tape->sense_key == 5) { | |
1da177e4 LT |
439 | /* don't report an error, everything's ok */ |
440 | pc->error = 0; | |
441 | /* don't retry read/write */ | |
346331f8 | 442 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
443 | } |
444 | } | |
90699ce2 | 445 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
1da177e4 | 446 | pc->error = IDETAPE_ERROR_FILEMARK; |
346331f8 | 447 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 448 | } |
90699ce2 | 449 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
450 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
451 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
1da177e4 | 452 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 453 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
454 | } |
455 | } | |
90699ce2 | 456 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 457 | if (tape->sense_key == 8) { |
1da177e4 | 458 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 459 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 460 | } |
346331f8 | 461 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 462 | pc->xferred) |
1da177e4 LT |
463 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
464 | } | |
465 | } | |
466 | ||
d01dbc3b | 467 | /* Free data buffers completely. */ |
077e3bdb | 468 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) |
1da177e4 | 469 | { |
077e3bdb | 470 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; |
d01dbc3b BP |
471 | |
472 | while (bh) { | |
473 | u32 size = bh->b_size; | |
474 | ||
475 | while (size) { | |
476 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
477 | ||
478 | if (bh->b_data) | |
479 | free_pages((unsigned long)bh->b_data, order); | |
480 | ||
481 | size &= (order-1); | |
482 | bh->b_data += (1 << order) * PAGE_SIZE; | |
1da177e4 LT |
483 | } |
484 | prev_bh = bh; | |
485 | bh = bh->b_reqnext; | |
486 | kfree(prev_bh); | |
487 | } | |
1da177e4 LT |
488 | } |
489 | ||
1da177e4 LT |
490 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
491 | { | |
492 | struct request *rq = HWGROUP(drive)->rq; | |
493 | idetape_tape_t *tape = drive->driver_data; | |
494 | unsigned long flags; | |
495 | int error; | |
1da177e4 | 496 | |
8004a8c9 | 497 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
498 | |
499 | switch (uptodate) { | |
5a04cfa9 BP |
500 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
501 | case 1: error = 0; break; | |
502 | default: error = uptodate; | |
1da177e4 LT |
503 | } |
504 | rq->errors = error; | |
505 | if (error) | |
506 | tape->failed_pc = NULL; | |
507 | ||
3687221f BZ |
508 | if (!blk_special_request(rq)) { |
509 | ide_end_request(drive, uptodate, nr_sects); | |
510 | return 0; | |
511 | } | |
512 | ||
54bb2074 | 513 | spin_lock_irqsave(&tape->lock, flags); |
1da177e4 | 514 | |
1da177e4 | 515 | ide_end_drive_cmd(drive, 0, 0); |
1da177e4 | 516 | |
54bb2074 | 517 | spin_unlock_irqrestore(&tape->lock, flags); |
1da177e4 LT |
518 | return 0; |
519 | } | |
520 | ||
b14c7212 BZ |
521 | static void ide_tape_handle_dsc(ide_drive_t *); |
522 | ||
523 | static void ide_tape_callback(ide_drive_t *drive, int dsc) | |
1da177e4 LT |
524 | { |
525 | idetape_tape_t *tape = drive->driver_data; | |
2b9efba4 | 526 | struct ide_atapi_pc *pc = drive->pc; |
5985e6ab | 527 | int uptodate = pc->error ? 0 : 1; |
1da177e4 | 528 | |
8004a8c9 BP |
529 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
530 | ||
b14c7212 BZ |
531 | if (dsc) |
532 | ide_tape_handle_dsc(drive); | |
533 | ||
dd2e9a03 BZ |
534 | if (tape->failed_pc == pc) |
535 | tape->failed_pc = NULL; | |
536 | ||
5985e6ab BZ |
537 | if (pc->c[0] == REQUEST_SENSE) { |
538 | if (uptodate) | |
539 | idetape_analyze_error(drive, pc->buf); | |
540 | else | |
541 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
542 | "itself - Aborting request!\n"); | |
543 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
544 | struct request *rq = drive->hwif->hwgroup->rq; | |
545 | int blocks = pc->xferred / tape->blk_size; | |
546 | ||
547 | tape->avg_size += blocks * tape->blk_size; | |
548 | ||
549 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
550 | tape->avg_speed = tape->avg_size * HZ / | |
551 | (jiffies - tape->avg_time) / 1024; | |
552 | tape->avg_size = 0; | |
553 | tape->avg_time = jiffies; | |
554 | } | |
555 | ||
556 | tape->first_frame += blocks; | |
557 | rq->current_nr_sectors -= blocks; | |
558 | ||
559 | if (pc->error) | |
560 | uptodate = pc->error; | |
561 | } else if (pc->c[0] == READ_POSITION && uptodate) { | |
2b9efba4 | 562 | u8 *readpos = pc->buf; |
5985e6ab BZ |
563 | |
564 | debug_log(DBG_SENSE, "BOP - %s\n", | |
565 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
566 | debug_log(DBG_SENSE, "EOP - %s\n", | |
567 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
568 | ||
569 | if (readpos[0] & 0x4) { | |
570 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
571 | "to the tape\n"); | |
f2e3ab52 | 572 | clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab BZ |
573 | uptodate = 0; |
574 | } else { | |
575 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
cd740ab0 | 576 | be32_to_cpup((__be32 *)&readpos[4])); |
5985e6ab BZ |
577 | |
578 | tape->partition = readpos[1]; | |
cd740ab0 | 579 | tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); |
f2e3ab52 | 580 | set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 581 | } |
1da177e4 | 582 | } |
5985e6ab BZ |
583 | |
584 | idetape_end_request(drive, uptodate, 0); | |
1da177e4 LT |
585 | } |
586 | ||
d236d74c | 587 | static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 588 | { |
7bf7420a | 589 | ide_init_pc(pc); |
90699ce2 | 590 | pc->c[0] = REQUEST_SENSE; |
1da177e4 | 591 | pc->c[4] = 20; |
d236d74c | 592 | pc->req_xfer = 20; |
1da177e4 LT |
593 | } |
594 | ||
1da177e4 LT |
595 | /* |
596 | * idetape_retry_pc is called when an error was detected during the | |
597 | * last packet command. We queue a request sense packet command in | |
598 | * the head of the request list. | |
599 | */ | |
258ec411 | 600 | static void idetape_retry_pc(ide_drive_t *drive) |
1da177e4 | 601 | { |
394a4c21 BZ |
602 | struct ide_tape_obj *tape = drive->driver_data; |
603 | struct request *rq = &tape->request_sense_rq; | |
2e8a6f89 | 604 | struct ide_atapi_pc *pc = &tape->request_sense_pc; |
1da177e4 | 605 | |
64a57fe4 | 606 | (void)ide_read_error(drive); |
1da177e4 | 607 | idetape_create_request_sense_cmd(pc); |
f2e3ab52 | 608 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
7645c151 | 609 | ide_queue_pc_head(drive, tape->disk, pc, rq); |
1da177e4 LT |
610 | } |
611 | ||
612 | /* | |
3c98bf34 BP |
613 | * Postpone the current request so that ide.c will be able to service requests |
614 | * from another device on the same hwgroup while we are polling for DSC. | |
1da177e4 | 615 | */ |
5a04cfa9 | 616 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
617 | { |
618 | idetape_tape_t *tape = drive->driver_data; | |
619 | ||
8004a8c9 BP |
620 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
621 | ||
1da177e4 | 622 | tape->postponed_rq = HWGROUP(drive)->rq; |
54bb2074 | 623 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
624 | } |
625 | ||
74e63e74 BZ |
626 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
627 | { | |
628 | idetape_tape_t *tape = drive->driver_data; | |
629 | ||
630 | /* Media access command */ | |
631 | tape->dsc_polling_start = jiffies; | |
632 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
633 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
634 | /* Allow ide.c to handle other requests */ | |
635 | idetape_postpone_request(drive); | |
636 | } | |
637 | ||
acaa0f5f | 638 | static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
08424ac2 BZ |
639 | unsigned int bcount, int write) |
640 | { | |
641 | if (write) | |
642 | idetape_output_buffers(drive, pc, bcount); | |
643 | else | |
644 | idetape_input_buffers(drive, pc, bcount); | |
acaa0f5f BZ |
645 | |
646 | return bcount; | |
08424ac2 | 647 | } |
a1efc85f | 648 | |
1da177e4 | 649 | /* |
a1efc85f BP |
650 | * This is the usual interrupt handler which will be called during a packet |
651 | * command. We will transfer some of the data (as requested by the drive) and | |
652 | * will re-point interrupt handler to us. When data transfer is finished, we | |
653 | * will act according to the algorithm described before | |
8d06bfad | 654 | * idetape_issue_pc. |
1da177e4 | 655 | */ |
a1efc85f | 656 | static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) |
1da177e4 | 657 | { |
844b9468 BZ |
658 | return ide_pc_intr(drive, idetape_pc_intr, idetape_update_buffers, |
659 | idetape_retry_pc, ide_tape_io_buffers); | |
1da177e4 LT |
660 | } |
661 | ||
662 | /* | |
3c98bf34 | 663 | * Packet Command Interface |
1da177e4 | 664 | * |
2b9efba4 | 665 | * The current Packet Command is available in drive->pc, and will not change |
3c98bf34 BP |
666 | * until we finish handling it. Each packet command is associated with a |
667 | * callback function that will be called when the command is finished. | |
1da177e4 | 668 | * |
3c98bf34 | 669 | * The handling will be done in three stages: |
1da177e4 | 670 | * |
3c98bf34 BP |
671 | * 1. idetape_issue_pc will send the packet command to the drive, and will set |
672 | * the interrupt handler to idetape_pc_intr. | |
1da177e4 | 673 | * |
3c98bf34 BP |
674 | * 2. On each interrupt, idetape_pc_intr will be called. This step will be |
675 | * repeated until the device signals us that no more interrupts will be issued. | |
1da177e4 | 676 | * |
3c98bf34 BP |
677 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
678 | * process. In case of a successful initiation of a media access packet command, | |
679 | * the DSC bit will be set when the actual execution of the command is finished. | |
680 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
681 | * event. In this case, we define the request as "low priority request" by | |
682 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
683 | * exit the driver. | |
1da177e4 | 684 | * |
3c98bf34 BP |
685 | * ide.c will then give higher priority to requests which originate from the |
686 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 687 | * |
3c98bf34 | 688 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 689 | * |
3c98bf34 BP |
690 | * 5. In case an error was found, we queue a request sense packet command in |
691 | * front of the request queue and retry the operation up to | |
692 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 693 | * |
3c98bf34 BP |
694 | * 6. In case no error was found, or we decided to give up and not to retry |
695 | * again, the callback function will be called and then we will handle the next | |
696 | * request. | |
1da177e4 LT |
697 | */ |
698 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) | |
699 | { | |
2b9efba4 | 700 | return ide_transfer_pc(drive, idetape_pc_intr, WAIT_TAPE_CMD, NULL); |
1da177e4 LT |
701 | } |
702 | ||
d236d74c BP |
703 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
704 | struct ide_atapi_pc *pc) | |
1da177e4 | 705 | { |
1da177e4 | 706 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 707 | |
2b9efba4 | 708 | if (drive->pc->c[0] == REQUEST_SENSE && |
90699ce2 | 709 | pc->c[0] == REQUEST_SENSE) { |
1da177e4 LT |
710 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
711 | "Two request sense in serial were issued\n"); | |
712 | } | |
1da177e4 | 713 | |
90699ce2 | 714 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
1da177e4 | 715 | tape->failed_pc = pc; |
2b9efba4 | 716 | |
1da177e4 | 717 | /* Set the current packet command */ |
2b9efba4 | 718 | drive->pc = pc; |
1da177e4 LT |
719 | |
720 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 721 | (pc->flags & PC_FLAG_ABORT)) { |
1da177e4 | 722 | /* |
3c98bf34 BP |
723 | * We will "abort" retrying a packet command in case legitimate |
724 | * error code was received (crossing a filemark, or end of the | |
725 | * media, for example). | |
1da177e4 | 726 | */ |
346331f8 | 727 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 728 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
729 | tape->sense_key == 2 && tape->asc == 4 && |
730 | (tape->ascq == 1 || tape->ascq == 8))) { | |
731 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
732 | "pc = %2x, key = %2x, " | |
733 | "asc = %2x, ascq = %2x\n", | |
734 | tape->name, pc->c[0], | |
735 | tape->sense_key, tape->asc, | |
736 | tape->ascq); | |
737 | } | |
738 | /* Giving up */ | |
739 | pc->error = IDETAPE_ERROR_GENERAL; | |
740 | } | |
741 | tape->failed_pc = NULL; | |
b14c7212 | 742 | drive->pc_callback(drive, 0); |
92f5daff | 743 | return ide_stopped; |
1da177e4 | 744 | } |
8004a8c9 | 745 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
746 | |
747 | pc->retries++; | |
1da177e4 | 748 | |
2b9efba4 | 749 | return ide_issue_pc(drive, idetape_transfer_pc, WAIT_TAPE_CMD, NULL); |
1da177e4 LT |
750 | } |
751 | ||
3c98bf34 | 752 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 753 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 | 754 | { |
7bf7420a | 755 | ide_init_pc(pc); |
90699ce2 | 756 | pc->c[0] = MODE_SENSE; |
1da177e4 | 757 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
758 | /* DBD = 1 - Don't return block descriptors */ |
759 | pc->c[1] = 8; | |
1da177e4 LT |
760 | pc->c[2] = page_code; |
761 | /* | |
762 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
763 | * | |
764 | * For SCSI this byte is defined as subpage instead of high byte | |
765 | * of length and some IDE drives seem to interpret it this way | |
766 | * and return an error when 255 is used. | |
767 | */ | |
768 | pc->c[3] = 0; | |
3c98bf34 BP |
769 | /* We will just discard data in that case */ |
770 | pc->c[4] = 255; | |
1da177e4 | 771 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 772 | pc->req_xfer = 12; |
1da177e4 | 773 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 774 | pc->req_xfer = 24; |
1da177e4 | 775 | else |
d236d74c | 776 | pc->req_xfer = 50; |
1da177e4 LT |
777 | } |
778 | ||
5a04cfa9 | 779 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 780 | { |
b73c7ee2 | 781 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 782 | idetape_tape_t *tape = drive->driver_data; |
2b9efba4 | 783 | struct ide_atapi_pc *pc = drive->pc; |
22c525b9 | 784 | u8 stat; |
1da177e4 | 785 | |
374e042c | 786 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 787 | |
3a7d2484 BZ |
788 | if (stat & ATA_DSC) { |
789 | if (stat & ATA_ERR) { | |
1da177e4 | 790 | /* Error detected */ |
90699ce2 | 791 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
792 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
793 | tape->name); | |
794 | /* Retry operation */ | |
258ec411 BZ |
795 | idetape_retry_pc(drive); |
796 | return ide_stopped; | |
1da177e4 LT |
797 | } |
798 | pc->error = 0; | |
1da177e4 LT |
799 | } else { |
800 | pc->error = IDETAPE_ERROR_GENERAL; | |
801 | tape->failed_pc = NULL; | |
802 | } | |
b14c7212 | 803 | drive->pc_callback(drive, 0); |
1da177e4 LT |
804 | return ide_stopped; |
805 | } | |
806 | ||
cd2abbfe | 807 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
808 | struct ide_atapi_pc *pc, struct request *rq, |
809 | u8 opcode) | |
1da177e4 | 810 | { |
0014c75b BP |
811 | struct idetape_bh *bh = (struct idetape_bh *)rq->special; |
812 | unsigned int length = rq->current_nr_sectors; | |
813 | ||
7bf7420a | 814 | ide_init_pc(pc); |
860ff5ec | 815 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 816 | pc->c[1] = 1; |
1da177e4 | 817 | pc->bh = bh; |
d236d74c BP |
818 | pc->buf = NULL; |
819 | pc->buf_size = length * tape->blk_size; | |
820 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 821 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 822 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 823 | |
cd2abbfe BP |
824 | if (opcode == READ_6) { |
825 | pc->c[0] = READ_6; | |
826 | atomic_set(&bh->b_count, 0); | |
827 | } else if (opcode == WRITE_6) { | |
828 | pc->c[0] = WRITE_6; | |
829 | pc->flags |= PC_FLAG_WRITING; | |
830 | pc->b_data = bh->b_data; | |
831 | pc->b_count = atomic_read(&bh->b_count); | |
832 | } | |
0014c75b BP |
833 | |
834 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
835 | } |
836 | ||
1da177e4 LT |
837 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
838 | struct request *rq, sector_t block) | |
839 | { | |
b73c7ee2 | 840 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 841 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 842 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 843 | struct request *postponed_rq = tape->postponed_rq; |
22c525b9 | 844 | u8 stat; |
1da177e4 | 845 | |
730616b2 MW |
846 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu," |
847 | " current_nr_sectors: %u\n", | |
848 | (unsigned long long)rq->sector, rq->nr_sectors, | |
849 | rq->current_nr_sectors); | |
1da177e4 | 850 | |
4aff5e23 | 851 | if (!blk_special_request(rq)) { |
3c98bf34 | 852 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 853 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 854 | "request queue (%d)\n", drive->name, rq->cmd_type); |
1da177e4 LT |
855 | ide_end_request(drive, 0, 0); |
856 | return ide_stopped; | |
857 | } | |
858 | ||
3c98bf34 | 859 | /* Retry a failed packet command */ |
2b9efba4 | 860 | if (tape->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { |
28c7214b BZ |
861 | pc = tape->failed_pc; |
862 | goto out; | |
863 | } | |
5a04cfa9 | 864 | |
1da177e4 LT |
865 | if (postponed_rq != NULL) |
866 | if (rq != postponed_rq) { | |
867 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
868 | "Two DSC requests were queued\n"); | |
869 | idetape_end_request(drive, 0, 0); | |
870 | return ide_stopped; | |
871 | } | |
1da177e4 LT |
872 | |
873 | tape->postponed_rq = NULL; | |
874 | ||
875 | /* | |
876 | * If the tape is still busy, postpone our request and service | |
877 | * the other device meanwhile. | |
878 | */ | |
374e042c | 879 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 880 | |
83dd5735 | 881 | if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2)) |
f2e3ab52 | 882 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 LT |
883 | |
884 | if (drive->post_reset == 1) { | |
f2e3ab52 | 885 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 LT |
886 | drive->post_reset = 0; |
887 | } | |
888 | ||
f2e3ab52 | 889 | if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && |
3a7d2484 | 890 | (stat & ATA_DSC) == 0) { |
1da177e4 LT |
891 | if (postponed_rq == NULL) { |
892 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 893 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
894 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
895 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
896 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
897 | tape->name); | |
83dd5735 | 898 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
899 | idetape_media_access_finished(drive); |
900 | return ide_stopped; | |
901 | } else { | |
902 | return ide_do_reset(drive); | |
903 | } | |
5a04cfa9 BP |
904 | } else if (time_after(jiffies, |
905 | tape->dsc_polling_start + | |
906 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 907 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
908 | idetape_postpone_request(drive); |
909 | return ide_stopped; | |
910 | } | |
83dd5735 | 911 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
2e8a6f89 | 912 | pc = &tape->queued_pc; |
0014c75b | 913 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
914 | goto out; |
915 | } | |
83dd5735 | 916 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
2e8a6f89 | 917 | pc = &tape->queued_pc; |
0014c75b | 918 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
919 | goto out; |
920 | } | |
83dd5735 | 921 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
d236d74c | 922 | pc = (struct ide_atapi_pc *) rq->buffer; |
83dd5735 BP |
923 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
924 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
925 | goto out; |
926 | } | |
83dd5735 | 927 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
928 | idetape_media_access_finished(drive); |
929 | return ide_stopped; | |
930 | } | |
931 | BUG(); | |
28c7214b | 932 | |
f2e3ab52 | 933 | out: |
8d06bfad | 934 | return idetape_issue_pc(drive, pc); |
1da177e4 LT |
935 | } |
936 | ||
1da177e4 | 937 | /* |
41aa1706 | 938 | * The function below uses __get_free_pages to allocate a data buffer of size |
f73850a3 | 939 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
3c98bf34 | 940 | * much as possible. |
1da177e4 | 941 | * |
41aa1706 BP |
942 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
943 | * failure. | |
1da177e4 | 944 | */ |
077e3bdb BP |
945 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, |
946 | int full, int clear) | |
1da177e4 | 947 | { |
077e3bdb | 948 | struct idetape_bh *prev_bh, *bh, *merge_bh; |
a997a435 | 949 | int pages = tape->pages_per_buffer; |
41aa1706 | 950 | unsigned int order, b_allocd; |
1da177e4 LT |
951 | char *b_data = NULL; |
952 | ||
077e3bdb BP |
953 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
954 | bh = merge_bh; | |
1da177e4 LT |
955 | if (bh == NULL) |
956 | goto abort; | |
41aa1706 BP |
957 | |
958 | order = fls(pages) - 1; | |
959 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 960 | if (!bh->b_data) |
1da177e4 | 961 | goto abort; |
41aa1706 BP |
962 | b_allocd = (1 << order) * PAGE_SIZE; |
963 | pages &= (order-1); | |
964 | ||
1da177e4 | 965 | if (clear) |
41aa1706 BP |
966 | memset(bh->b_data, 0, b_allocd); |
967 | bh->b_reqnext = NULL; | |
968 | bh->b_size = b_allocd; | |
1da177e4 LT |
969 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
970 | ||
41aa1706 BP |
971 | while (pages) { |
972 | order = fls(pages) - 1; | |
973 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 974 | if (!b_data) |
1da177e4 | 975 | goto abort; |
41aa1706 BP |
976 | b_allocd = (1 << order) * PAGE_SIZE; |
977 | ||
1da177e4 | 978 | if (clear) |
41aa1706 BP |
979 | memset(b_data, 0, b_allocd); |
980 | ||
981 | /* newly allocated page frames below buffer header or ...*/ | |
982 | if (bh->b_data == b_data + b_allocd) { | |
983 | bh->b_size += b_allocd; | |
984 | bh->b_data -= b_allocd; | |
1da177e4 | 985 | if (full) |
41aa1706 | 986 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
987 | continue; |
988 | } | |
41aa1706 | 989 | /* they are above the header */ |
1da177e4 | 990 | if (b_data == bh->b_data + bh->b_size) { |
41aa1706 | 991 | bh->b_size += b_allocd; |
1da177e4 | 992 | if (full) |
41aa1706 | 993 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
994 | continue; |
995 | } | |
996 | prev_bh = bh; | |
5a04cfa9 BP |
997 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
998 | if (!bh) { | |
41aa1706 | 999 | free_pages((unsigned long) b_data, order); |
1da177e4 LT |
1000 | goto abort; |
1001 | } | |
1002 | bh->b_reqnext = NULL; | |
1003 | bh->b_data = b_data; | |
41aa1706 | 1004 | bh->b_size = b_allocd; |
1da177e4 LT |
1005 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1006 | prev_bh->b_reqnext = bh; | |
41aa1706 BP |
1007 | |
1008 | pages &= (order-1); | |
1da177e4 | 1009 | } |
41aa1706 | 1010 | |
1da177e4 LT |
1011 | bh->b_size -= tape->excess_bh_size; |
1012 | if (full) | |
1013 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
077e3bdb | 1014 | return merge_bh; |
1da177e4 | 1015 | abort: |
077e3bdb | 1016 | ide_tape_kfree_buffer(tape); |
1da177e4 LT |
1017 | return NULL; |
1018 | } | |
1019 | ||
5a04cfa9 | 1020 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
8646c88f | 1021 | const char __user *buf, int n) |
1da177e4 LT |
1022 | { |
1023 | struct idetape_bh *bh = tape->bh; | |
1024 | int count; | |
dcd96379 | 1025 | int ret = 0; |
1da177e4 LT |
1026 | |
1027 | while (n) { | |
1da177e4 | 1028 | if (bh == NULL) { |
5a04cfa9 BP |
1029 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1030 | __func__); | |
dcd96379 | 1031 | return 1; |
1da177e4 | 1032 | } |
5a04cfa9 BP |
1033 | count = min((unsigned int) |
1034 | (bh->b_size - atomic_read(&bh->b_count)), | |
1035 | (unsigned int)n); | |
1036 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
1037 | count)) | |
dcd96379 | 1038 | ret = 1; |
1da177e4 LT |
1039 | n -= count; |
1040 | atomic_add(count, &bh->b_count); | |
1041 | buf += count; | |
1042 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
1043 | bh = bh->b_reqnext; | |
1044 | if (bh) | |
1045 | atomic_set(&bh->b_count, 0); | |
1046 | } | |
1047 | } | |
1048 | tape->bh = bh; | |
dcd96379 | 1049 | return ret; |
1da177e4 LT |
1050 | } |
1051 | ||
5a04cfa9 | 1052 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
99d74e61 | 1053 | int n) |
1da177e4 LT |
1054 | { |
1055 | struct idetape_bh *bh = tape->bh; | |
1056 | int count; | |
dcd96379 | 1057 | int ret = 0; |
1da177e4 LT |
1058 | |
1059 | while (n) { | |
1da177e4 | 1060 | if (bh == NULL) { |
5a04cfa9 BP |
1061 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1062 | __func__); | |
dcd96379 | 1063 | return 1; |
1da177e4 | 1064 | } |
1da177e4 | 1065 | count = min(tape->b_count, n); |
dcd96379 DW |
1066 | if (copy_to_user(buf, tape->b_data, count)) |
1067 | ret = 1; | |
1da177e4 LT |
1068 | n -= count; |
1069 | tape->b_data += count; | |
1070 | tape->b_count -= count; | |
1071 | buf += count; | |
1072 | if (!tape->b_count) { | |
5a04cfa9 BP |
1073 | bh = bh->b_reqnext; |
1074 | tape->bh = bh; | |
1da177e4 LT |
1075 | if (bh) { |
1076 | tape->b_data = bh->b_data; | |
1077 | tape->b_count = atomic_read(&bh->b_count); | |
1078 | } | |
1079 | } | |
1080 | } | |
dcd96379 | 1081 | return ret; |
1da177e4 LT |
1082 | } |
1083 | ||
077e3bdb | 1084 | static void idetape_init_merge_buffer(idetape_tape_t *tape) |
1da177e4 | 1085 | { |
077e3bdb BP |
1086 | struct idetape_bh *bh = tape->merge_bh; |
1087 | tape->bh = tape->merge_bh; | |
5a04cfa9 | 1088 | |
54abf37e | 1089 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 LT |
1090 | atomic_set(&bh->b_count, 0); |
1091 | else { | |
1092 | tape->b_data = bh->b_data; | |
1093 | tape->b_count = atomic_read(&bh->b_count); | |
1094 | } | |
1095 | } | |
1096 | ||
1da177e4 | 1097 | /* |
3c98bf34 BP |
1098 | * Write a filemark if write_filemark=1. Flush the device buffers without |
1099 | * writing a filemark otherwise. | |
1da177e4 | 1100 | */ |
5a04cfa9 | 1101 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 1102 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 | 1103 | { |
7bf7420a | 1104 | ide_init_pc(pc); |
90699ce2 | 1105 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 1106 | pc->c[4] = write_filemark; |
346331f8 | 1107 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1108 | } |
1109 | ||
1da177e4 LT |
1110 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
1111 | { | |
1112 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1113 | struct gendisk *disk = tape->disk; |
1da177e4 LT |
1114 | int load_attempted = 0; |
1115 | ||
3c98bf34 | 1116 | /* Wait for the tape to become ready */ |
f2e3ab52 | 1117 | set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
1da177e4 LT |
1118 | timeout += jiffies; |
1119 | while (time_before(jiffies, timeout)) { | |
de699ad5 | 1120 | if (ide_do_test_unit_ready(drive, disk) == 0) |
1da177e4 LT |
1121 | return 0; |
1122 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
1123 | || (tape->asc == 0x3A)) { |
1124 | /* no media */ | |
1da177e4 LT |
1125 | if (load_attempted) |
1126 | return -ENOMEDIUM; | |
0c8a6c7a | 1127 | ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
1da177e4 LT |
1128 | load_attempted = 1; |
1129 | /* not about to be ready */ | |
1130 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1131 | (tape->ascq == 1 || tape->ascq == 8))) | |
1132 | return -EIO; | |
80ce45fd | 1133 | msleep(100); |
1da177e4 LT |
1134 | } |
1135 | return -EIO; | |
1136 | } | |
1137 | ||
5a04cfa9 | 1138 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 1139 | { |
2ac07d92 | 1140 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1141 | struct ide_atapi_pc pc; |
1da177e4 LT |
1142 | int rc; |
1143 | ||
1144 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
2ac07d92 | 1145 | rc = ide_queue_pc_tail(drive, tape->disk, &pc); |
5a04cfa9 | 1146 | if (rc) |
1da177e4 LT |
1147 | return rc; |
1148 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1149 | return 0; | |
1150 | } | |
1151 | ||
d236d74c | 1152 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1153 | { |
7bf7420a | 1154 | ide_init_pc(pc); |
90699ce2 | 1155 | pc->c[0] = READ_POSITION; |
d236d74c | 1156 | pc->req_xfer = 20; |
1da177e4 LT |
1157 | } |
1158 | ||
5a04cfa9 | 1159 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
1160 | { |
1161 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1162 | struct ide_atapi_pc pc; |
1da177e4 LT |
1163 | int position; |
1164 | ||
8004a8c9 | 1165 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
1166 | |
1167 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1168 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) |
1da177e4 | 1169 | return -1; |
54bb2074 | 1170 | position = tape->first_frame; |
1da177e4 LT |
1171 | return position; |
1172 | } | |
1173 | ||
d236d74c BP |
1174 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
1175 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1176 | unsigned int block, u8 partition, int skip) |
1da177e4 | 1177 | { |
7bf7420a | 1178 | ide_init_pc(pc); |
90699ce2 | 1179 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 1180 | pc->c[1] = 2; |
860ff5ec | 1181 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 1182 | pc->c[8] = partition; |
346331f8 | 1183 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1184 | } |
1185 | ||
ec0fdb01 | 1186 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1187 | { |
1188 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1189 | |
54abf37e | 1190 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 1191 | return; |
1da177e4 | 1192 | |
f2e3ab52 | 1193 | clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); |
01a63aeb | 1194 | tape->merge_bh_size = 0; |
077e3bdb BP |
1195 | if (tape->merge_bh != NULL) { |
1196 | ide_tape_kfree_buffer(tape); | |
1197 | tape->merge_bh = NULL; | |
1da177e4 LT |
1198 | } |
1199 | ||
54abf37e | 1200 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1201 | } |
1202 | ||
1203 | /* | |
3c98bf34 BP |
1204 | * Position the tape to the requested block using the LOCATE packet command. |
1205 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1206 | * all higher level operations, we queue the commands at the tail of the request | |
1207 | * queue and wait for their completion. | |
1da177e4 | 1208 | */ |
5a04cfa9 BP |
1209 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
1210 | u8 partition, int skip) | |
1da177e4 LT |
1211 | { |
1212 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1213 | struct gendisk *disk = tape->disk; |
1da177e4 | 1214 | int retval; |
d236d74c | 1215 | struct ide_atapi_pc pc; |
1da177e4 | 1216 | |
54abf37e | 1217 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 1218 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1219 | idetape_wait_ready(drive, 60 * 5 * HZ); |
1220 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
2ac07d92 | 1221 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1222 | if (retval) |
1223 | return (retval); | |
1224 | ||
1225 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1226 | return ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1227 | } |
1228 | ||
ec0fdb01 | 1229 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 1230 | int restore_position) |
1da177e4 LT |
1231 | { |
1232 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1233 | int seek, position; |
1234 | ||
ec0fdb01 | 1235 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1236 | if (restore_position) { |
1237 | position = idetape_read_position(drive); | |
9798630a | 1238 | seek = position > 0 ? position : 0; |
1da177e4 | 1239 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 1240 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 1241 | " %s\n", tape->name, __func__); |
1da177e4 LT |
1242 | return; |
1243 | } | |
1244 | } | |
1245 | } | |
1246 | ||
1247 | /* | |
3c98bf34 BP |
1248 | * Generate a read/write request for the block device interface and wait for it |
1249 | * to be serviced. | |
1da177e4 | 1250 | */ |
5a04cfa9 BP |
1251 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
1252 | struct idetape_bh *bh) | |
1da177e4 LT |
1253 | { |
1254 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a FT |
1255 | struct request *rq; |
1256 | int ret, errors; | |
1da177e4 | 1257 | |
8004a8c9 BP |
1258 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
1259 | ||
64ea1b4a FT |
1260 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1261 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1262 | rq->cmd[13] = cmd; |
64ea1b4a FT |
1263 | rq->rq_disk = tape->disk; |
1264 | rq->special = (void *)bh; | |
1265 | rq->sector = tape->first_frame; | |
1266 | rq->nr_sectors = blocks; | |
1267 | rq->current_nr_sectors = blocks; | |
1268 | blk_execute_rq(drive->queue, tape->disk, rq, 0); | |
1269 | ||
1270 | errors = rq->errors; | |
1271 | ret = tape->blk_size * (blocks - rq->current_nr_sectors); | |
1272 | blk_put_request(rq); | |
1da177e4 LT |
1273 | |
1274 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1275 | return 0; | |
1276 | ||
077e3bdb BP |
1277 | if (tape->merge_bh) |
1278 | idetape_init_merge_buffer(tape); | |
64ea1b4a | 1279 | if (errors == IDETAPE_ERROR_GENERAL) |
1da177e4 | 1280 | return -EIO; |
64ea1b4a | 1281 | return ret; |
1da177e4 LT |
1282 | } |
1283 | ||
d236d74c | 1284 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1285 | { |
7bf7420a | 1286 | ide_init_pc(pc); |
90699ce2 | 1287 | pc->c[0] = INQUIRY; |
5a04cfa9 | 1288 | pc->c[4] = 254; |
d236d74c | 1289 | pc->req_xfer = 254; |
1da177e4 LT |
1290 | } |
1291 | ||
d236d74c BP |
1292 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
1293 | struct ide_atapi_pc *pc) | |
1da177e4 | 1294 | { |
7bf7420a | 1295 | ide_init_pc(pc); |
90699ce2 | 1296 | pc->c[0] = REZERO_UNIT; |
346331f8 | 1297 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1298 | } |
1299 | ||
d236d74c | 1300 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1301 | { |
7bf7420a | 1302 | ide_init_pc(pc); |
90699ce2 | 1303 | pc->c[0] = ERASE; |
1da177e4 | 1304 | pc->c[1] = 1; |
346331f8 | 1305 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1306 | } |
1307 | ||
d236d74c | 1308 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 | 1309 | { |
7bf7420a | 1310 | ide_init_pc(pc); |
90699ce2 | 1311 | pc->c[0] = SPACE; |
860ff5ec | 1312 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 1313 | pc->c[1] = cmd; |
346331f8 | 1314 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1315 | } |
1316 | ||
97c566ce | 1317 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 1318 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1319 | { |
1320 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1321 | |
8004a8c9 | 1322 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 1323 | |
0aa4b01e | 1324 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
077e3bdb | 1325 | blocks, tape->merge_bh); |
1da177e4 LT |
1326 | } |
1327 | ||
d9df937a | 1328 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1329 | { |
1330 | idetape_tape_t *tape = drive->driver_data; | |
1331 | int blocks, min; | |
1332 | struct idetape_bh *bh; | |
55a5d291 | 1333 | |
54abf37e | 1334 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 1335 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 1336 | " but we are not writing.\n"); |
1da177e4 LT |
1337 | return; |
1338 | } | |
01a63aeb | 1339 | if (tape->merge_bh_size > tape->buffer_size) { |
1da177e4 | 1340 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
01a63aeb | 1341 | tape->merge_bh_size = tape->buffer_size; |
1da177e4 | 1342 | } |
01a63aeb BP |
1343 | if (tape->merge_bh_size) { |
1344 | blocks = tape->merge_bh_size / tape->blk_size; | |
1345 | if (tape->merge_bh_size % tape->blk_size) { | |
1da177e4 LT |
1346 | unsigned int i; |
1347 | ||
1348 | blocks++; | |
01a63aeb | 1349 | i = tape->blk_size - tape->merge_bh_size % |
54bb2074 | 1350 | tape->blk_size; |
1da177e4 LT |
1351 | bh = tape->bh->b_reqnext; |
1352 | while (bh) { | |
1353 | atomic_set(&bh->b_count, 0); | |
1354 | bh = bh->b_reqnext; | |
1355 | } | |
1356 | bh = tape->bh; | |
1357 | while (i) { | |
1358 | if (bh == NULL) { | |
5a04cfa9 BP |
1359 | printk(KERN_INFO "ide-tape: bug," |
1360 | " bh NULL\n"); | |
1da177e4 LT |
1361 | break; |
1362 | } | |
5a04cfa9 BP |
1363 | min = min(i, (unsigned int)(bh->b_size - |
1364 | atomic_read(&bh->b_count))); | |
1365 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1366 | 0, min); | |
1da177e4 LT |
1367 | atomic_add(min, &bh->b_count); |
1368 | i -= min; | |
1369 | bh = bh->b_reqnext; | |
1370 | } | |
1371 | } | |
1372 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
01a63aeb | 1373 | tape->merge_bh_size = 0; |
1da177e4 | 1374 | } |
077e3bdb BP |
1375 | if (tape->merge_bh != NULL) { |
1376 | ide_tape_kfree_buffer(tape); | |
1377 | tape->merge_bh = NULL; | |
1da177e4 | 1378 | } |
54abf37e | 1379 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1380 | } |
1381 | ||
83042b24 | 1382 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
1383 | { |
1384 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1385 | int bytes_read; |
1da177e4 LT |
1386 | |
1387 | /* Initialize read operation */ | |
54abf37e BP |
1388 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1389 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
d9df937a | 1390 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1391 | idetape_flush_tape_buffers(drive); |
1392 | } | |
077e3bdb | 1393 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1394 | printk(KERN_ERR "ide-tape: merge_bh_size should be" |
5a04cfa9 | 1395 | " 0 now\n"); |
01a63aeb | 1396 | tape->merge_bh_size = 0; |
1da177e4 | 1397 | } |
077e3bdb BP |
1398 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1399 | if (!tape->merge_bh) | |
1da177e4 | 1400 | return -ENOMEM; |
54abf37e | 1401 | tape->chrdev_dir = IDETAPE_DIR_READ; |
1da177e4 LT |
1402 | |
1403 | /* | |
3c98bf34 BP |
1404 | * Issue a read 0 command to ensure that DSC handshake is |
1405 | * switched from completion mode to buffer available mode. | |
1406 | * No point in issuing this if DSC overlap isn't supported, some | |
1407 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1408 | */ |
1409 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1410 | bytes_read = idetape_queue_rw_tail(drive, |
1411 | REQ_IDETAPE_READ, 0, | |
077e3bdb | 1412 | tape->merge_bh); |
1da177e4 | 1413 | if (bytes_read < 0) { |
077e3bdb BP |
1414 | ide_tape_kfree_buffer(tape); |
1415 | tape->merge_bh = NULL; | |
54abf37e | 1416 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1417 | return bytes_read; |
1418 | } | |
1419 | } | |
1420 | } | |
5e69bd95 | 1421 | |
1da177e4 LT |
1422 | return 0; |
1423 | } | |
1424 | ||
5bd50dc6 | 1425 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1426 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1427 | { |
1428 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1429 | |
8004a8c9 | 1430 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1431 | |
3c98bf34 | 1432 | /* If we are at a filemark, return a read length of 0 */ |
f2e3ab52 | 1433 | if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 LT |
1434 | return 0; |
1435 | ||
83042b24 | 1436 | idetape_init_read(drive); |
5e69bd95 | 1437 | |
5e69bd95 | 1438 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
077e3bdb | 1439 | tape->merge_bh); |
1da177e4 LT |
1440 | } |
1441 | ||
5a04cfa9 | 1442 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1443 | { |
1444 | idetape_tape_t *tape = drive->driver_data; | |
1445 | struct idetape_bh *bh; | |
1446 | int blocks; | |
3c98bf34 | 1447 | |
1da177e4 LT |
1448 | while (bcount) { |
1449 | unsigned int count; | |
1450 | ||
077e3bdb | 1451 | bh = tape->merge_bh; |
f73850a3 | 1452 | count = min(tape->buffer_size, bcount); |
1da177e4 | 1453 | bcount -= count; |
54bb2074 | 1454 | blocks = count / tape->blk_size; |
1da177e4 | 1455 | while (count) { |
5a04cfa9 BP |
1456 | atomic_set(&bh->b_count, |
1457 | min(count, (unsigned int)bh->b_size)); | |
1da177e4 LT |
1458 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
1459 | count -= atomic_read(&bh->b_count); | |
1460 | bh = bh->b_reqnext; | |
1461 | } | |
5a04cfa9 | 1462 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
077e3bdb | 1463 | tape->merge_bh); |
1da177e4 LT |
1464 | } |
1465 | } | |
1466 | ||
1da177e4 | 1467 | /* |
3c98bf34 BP |
1468 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1469 | * currently support only one partition. | |
1470 | */ | |
5a04cfa9 | 1471 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 | 1472 | { |
2ac07d92 BZ |
1473 | struct ide_tape_obj *tape = drive->driver_data; |
1474 | struct gendisk *disk = tape->disk; | |
1da177e4 | 1475 | int retval; |
d236d74c | 1476 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1477 | |
1478 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1479 | ||
1da177e4 | 1480 | idetape_create_rewind_cmd(drive, &pc); |
2ac07d92 | 1481 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1482 | if (retval) |
1483 | return retval; | |
1484 | ||
1485 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1486 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1487 | if (retval) |
1488 | return retval; | |
1489 | return 0; | |
1490 | } | |
1491 | ||
3c98bf34 | 1492 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1493 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1494 | unsigned long arg) | |
1da177e4 LT |
1495 | { |
1496 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1497 | void __user *argp = (void __user *)arg; |
1498 | ||
d59823fa BP |
1499 | struct idetape_config { |
1500 | int dsc_rw_frequency; | |
1501 | int dsc_media_access_frequency; | |
1502 | int nr_stages; | |
1503 | } config; | |
1504 | ||
8004a8c9 BP |
1505 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1506 | ||
1da177e4 | 1507 | switch (cmd) { |
5a04cfa9 BP |
1508 | case 0x0340: |
1509 | if (copy_from_user(&config, argp, sizeof(config))) | |
1510 | return -EFAULT; | |
1511 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1512 | break; |
1513 | case 0x0350: | |
1514 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1515 | config.nr_stages = 1; |
5a04cfa9 BP |
1516 | if (copy_to_user(argp, &config, sizeof(config))) |
1517 | return -EFAULT; | |
1518 | break; | |
1519 | default: | |
1520 | return -EIO; | |
1da177e4 LT |
1521 | } |
1522 | return 0; | |
1523 | } | |
1524 | ||
5a04cfa9 BP |
1525 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1526 | int mt_count) | |
1da177e4 LT |
1527 | { |
1528 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1529 | struct gendisk *disk = tape->disk; |
d236d74c | 1530 | struct ide_atapi_pc pc; |
5a04cfa9 | 1531 | int retval, count = 0; |
b6422013 | 1532 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1533 | |
1534 | if (mt_count == 0) | |
1535 | return 0; | |
1536 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1537 | if (!sprev) |
1da177e4 | 1538 | return -EIO; |
5a04cfa9 | 1539 | mt_count = -mt_count; |
1da177e4 LT |
1540 | } |
1541 | ||
54abf37e | 1542 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
01a63aeb | 1543 | tape->merge_bh_size = 0; |
f2e3ab52 | 1544 | if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 | 1545 | ++count; |
ec0fdb01 | 1546 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1547 | } |
1548 | ||
1da177e4 | 1549 | switch (mt_op) { |
5a04cfa9 BP |
1550 | case MTFSF: |
1551 | case MTBSF: | |
1552 | idetape_create_space_cmd(&pc, mt_count - count, | |
1553 | IDETAPE_SPACE_OVER_FILEMARK); | |
2ac07d92 | 1554 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1555 | case MTFSFM: |
1556 | case MTBSFM: | |
1557 | if (!sprev) | |
1558 | return -EIO; | |
1559 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1560 | mt_count - count); | |
1561 | if (retval) | |
1562 | return retval; | |
1563 | count = (MTBSFM == mt_op ? 1 : -1); | |
1564 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1565 | default: | |
1566 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1567 | mt_op); | |
1568 | return -EIO; | |
1da177e4 LT |
1569 | } |
1570 | } | |
1571 | ||
1da177e4 | 1572 | /* |
3c98bf34 | 1573 | * Our character device read / write functions. |
1da177e4 | 1574 | * |
3c98bf34 BP |
1575 | * The tape is optimized to maximize throughput when it is transferring an |
1576 | * integral number of the "continuous transfer limit", which is a parameter of | |
1577 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1578 | * |
3c98bf34 BP |
1579 | * As of version 1.3 of the driver, the character device provides an abstract |
1580 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1581 | * same backup/restore procedure is supported. The driver will internally | |
1582 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1583 | * between the user's block size to the recommended size will only result in a | |
1584 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1585 | * This is not applicable to Onstream. | |
1da177e4 | 1586 | */ |
5a04cfa9 BP |
1587 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1588 | size_t count, loff_t *ppos) | |
1da177e4 LT |
1589 | { |
1590 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1591 | ide_drive_t *drive = tape->drive; | |
5a04cfa9 | 1592 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 1593 | ssize_t ret = 0; |
b6422013 | 1594 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 1595 | |
8004a8c9 | 1596 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1597 | |
54abf37e | 1598 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
f2e3ab52 | 1599 | if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) |
54bb2074 BP |
1600 | if (count > tape->blk_size && |
1601 | (count % tape->blk_size) == 0) | |
1602 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1603 | } |
83042b24 | 1604 | rc = idetape_init_read(drive); |
8d06bfad | 1605 | if (rc < 0) |
1da177e4 LT |
1606 | return rc; |
1607 | if (count == 0) | |
1608 | return (0); | |
01a63aeb BP |
1609 | if (tape->merge_bh_size) { |
1610 | actually_read = min((unsigned int)(tape->merge_bh_size), | |
5a04cfa9 | 1611 | (unsigned int)count); |
99d74e61 | 1612 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
dcd96379 | 1613 | ret = -EFAULT; |
1da177e4 | 1614 | buf += actually_read; |
01a63aeb | 1615 | tape->merge_bh_size -= actually_read; |
1da177e4 LT |
1616 | count -= actually_read; |
1617 | } | |
f73850a3 | 1618 | while (count >= tape->buffer_size) { |
b6422013 | 1619 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1620 | if (bytes_read <= 0) |
1621 | goto finish; | |
99d74e61 | 1622 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
dcd96379 | 1623 | ret = -EFAULT; |
1da177e4 LT |
1624 | buf += bytes_read; |
1625 | count -= bytes_read; | |
1626 | actually_read += bytes_read; | |
1627 | } | |
1628 | if (count) { | |
b6422013 | 1629 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1630 | if (bytes_read <= 0) |
1631 | goto finish; | |
1632 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
99d74e61 | 1633 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
dcd96379 | 1634 | ret = -EFAULT; |
1da177e4 | 1635 | actually_read += temp; |
01a63aeb | 1636 | tape->merge_bh_size = bytes_read-temp; |
1da177e4 LT |
1637 | } |
1638 | finish: | |
f2e3ab52 | 1639 | if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { |
8004a8c9 BP |
1640 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1641 | ||
1da177e4 LT |
1642 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1643 | return 0; | |
1644 | } | |
dcd96379 | 1645 | |
5a04cfa9 | 1646 | return ret ? ret : actually_read; |
1da177e4 LT |
1647 | } |
1648 | ||
5a04cfa9 | 1649 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1650 | size_t count, loff_t *ppos) |
1651 | { | |
1652 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1653 | ide_drive_t *drive = tape->drive; | |
dcd96379 DW |
1654 | ssize_t actually_written = 0; |
1655 | ssize_t ret = 0; | |
b6422013 | 1656 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
1657 | |
1658 | /* The drive is write protected. */ | |
1659 | if (tape->write_prot) | |
1660 | return -EACCES; | |
1661 | ||
8004a8c9 | 1662 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1663 | |
1664 | /* Initialize write operation */ | |
54abf37e BP |
1665 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
1666 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1667 | ide_tape_discard_merge_buffer(drive, 1); |
077e3bdb | 1668 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1669 | printk(KERN_ERR "ide-tape: merge_bh_size " |
1da177e4 | 1670 | "should be 0 now\n"); |
01a63aeb | 1671 | tape->merge_bh_size = 0; |
1da177e4 | 1672 | } |
077e3bdb BP |
1673 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1674 | if (!tape->merge_bh) | |
1da177e4 | 1675 | return -ENOMEM; |
54abf37e | 1676 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
077e3bdb | 1677 | idetape_init_merge_buffer(tape); |
1da177e4 LT |
1678 | |
1679 | /* | |
3c98bf34 BP |
1680 | * Issue a write 0 command to ensure that DSC handshake is |
1681 | * switched from completion mode to buffer available mode. No | |
1682 | * point in issuing this if DSC overlap isn't supported, some | |
1683 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1684 | */ |
1685 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1686 | ssize_t retval = idetape_queue_rw_tail(drive, |
1687 | REQ_IDETAPE_WRITE, 0, | |
077e3bdb | 1688 | tape->merge_bh); |
1da177e4 | 1689 | if (retval < 0) { |
077e3bdb BP |
1690 | ide_tape_kfree_buffer(tape); |
1691 | tape->merge_bh = NULL; | |
54abf37e | 1692 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1693 | return retval; |
1694 | } | |
1695 | } | |
1696 | } | |
1697 | if (count == 0) | |
1698 | return (0); | |
01a63aeb BP |
1699 | if (tape->merge_bh_size) { |
1700 | if (tape->merge_bh_size >= tape->buffer_size) { | |
5a04cfa9 | 1701 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
01a63aeb | 1702 | tape->merge_bh_size = 0; |
1da177e4 | 1703 | } |
5a04cfa9 | 1704 | actually_written = min((unsigned int) |
01a63aeb | 1705 | (tape->buffer_size - tape->merge_bh_size), |
5a04cfa9 | 1706 | (unsigned int)count); |
8646c88f | 1707 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
dcd96379 | 1708 | ret = -EFAULT; |
1da177e4 | 1709 | buf += actually_written; |
01a63aeb | 1710 | tape->merge_bh_size += actually_written; |
1da177e4 LT |
1711 | count -= actually_written; |
1712 | ||
01a63aeb | 1713 | if (tape->merge_bh_size == tape->buffer_size) { |
dcd96379 | 1714 | ssize_t retval; |
01a63aeb | 1715 | tape->merge_bh_size = 0; |
b6422013 | 1716 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
1717 | if (retval <= 0) |
1718 | return (retval); | |
1719 | } | |
1720 | } | |
f73850a3 | 1721 | while (count >= tape->buffer_size) { |
dcd96379 | 1722 | ssize_t retval; |
f73850a3 | 1723 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
dcd96379 | 1724 | ret = -EFAULT; |
f73850a3 BP |
1725 | buf += tape->buffer_size; |
1726 | count -= tape->buffer_size; | |
b6422013 | 1727 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 1728 | actually_written += tape->buffer_size; |
1da177e4 LT |
1729 | if (retval <= 0) |
1730 | return (retval); | |
1731 | } | |
1732 | if (count) { | |
1733 | actually_written += count; | |
8646c88f | 1734 | if (idetape_copy_stage_from_user(tape, buf, count)) |
dcd96379 | 1735 | ret = -EFAULT; |
01a63aeb | 1736 | tape->merge_bh_size += count; |
1da177e4 | 1737 | } |
5a04cfa9 | 1738 | return ret ? ret : actually_written; |
1da177e4 LT |
1739 | } |
1740 | ||
5a04cfa9 | 1741 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1742 | { |
2ac07d92 | 1743 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1744 | struct ide_atapi_pc pc; |
1da177e4 LT |
1745 | |
1746 | /* Write a filemark */ | |
1747 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
2ac07d92 | 1748 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
1da177e4 LT |
1749 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
1750 | return -EIO; | |
1751 | } | |
1752 | return 0; | |
1753 | } | |
1754 | ||
1755 | /* | |
d99c9da2 BP |
1756 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1757 | * requested. | |
1da177e4 | 1758 | * |
d99c9da2 BP |
1759 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1760 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1761 | * usually not supported. |
1da177e4 | 1762 | * |
d99c9da2 | 1763 | * The following commands are currently not supported: |
1da177e4 | 1764 | * |
d99c9da2 BP |
1765 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1766 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1767 | */ |
d99c9da2 | 1768 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1769 | { |
1770 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1771 | struct gendisk *disk = tape->disk; |
d236d74c | 1772 | struct ide_atapi_pc pc; |
5a04cfa9 | 1773 | int i, retval; |
1da177e4 | 1774 | |
8004a8c9 BP |
1775 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
1776 | mt_op, mt_count); | |
5a04cfa9 | 1777 | |
1da177e4 | 1778 | switch (mt_op) { |
5a04cfa9 BP |
1779 | case MTFSF: |
1780 | case MTFSFM: | |
1781 | case MTBSF: | |
1782 | case MTBSFM: | |
1783 | if (!mt_count) | |
1784 | return 0; | |
1785 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1786 | default: | |
1787 | break; | |
1da177e4 | 1788 | } |
5a04cfa9 | 1789 | |
1da177e4 | 1790 | switch (mt_op) { |
5a04cfa9 BP |
1791 | case MTWEOF: |
1792 | if (tape->write_prot) | |
1793 | return -EACCES; | |
ec0fdb01 | 1794 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1795 | for (i = 0; i < mt_count; i++) { |
1796 | retval = idetape_write_filemark(drive); | |
1797 | if (retval) | |
1798 | return retval; | |
1799 | } | |
1800 | return 0; | |
1801 | case MTREW: | |
ec0fdb01 | 1802 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1803 | if (idetape_rewind_tape(drive)) |
1804 | return -EIO; | |
1805 | return 0; | |
1806 | case MTLOAD: | |
ec0fdb01 | 1807 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1808 | return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1809 | case MTUNLOAD: |
1810 | case MTOFFL: | |
1811 | /* | |
1812 | * If door is locked, attempt to unlock before | |
1813 | * attempting to eject. | |
1814 | */ | |
1815 | if (tape->door_locked) { | |
0578042d | 1816 | if (!ide_set_media_lock(drive, disk, 0)) |
385a4b87 | 1817 | tape->door_locked = DOOR_UNLOCKED; |
5a04cfa9 | 1818 | } |
ec0fdb01 | 1819 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1820 | retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); |
5a04cfa9 | 1821 | if (!retval) |
f2e3ab52 | 1822 | clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
5a04cfa9 BP |
1823 | return retval; |
1824 | case MTNOP: | |
ec0fdb01 | 1825 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1826 | return idetape_flush_tape_buffers(drive); |
1827 | case MTRETEN: | |
ec0fdb01 | 1828 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1829 | return ide_do_start_stop(drive, disk, |
5a04cfa9 | 1830 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1831 | case MTEOM: |
1832 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
2ac07d92 | 1833 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1834 | case MTERASE: |
1835 | (void)idetape_rewind_tape(drive); | |
1836 | idetape_create_erase_cmd(&pc); | |
2ac07d92 | 1837 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1838 | case MTSETBLK: |
1839 | if (mt_count) { | |
1840 | if (mt_count < tape->blk_size || | |
1841 | mt_count % tape->blk_size) | |
1da177e4 | 1842 | return -EIO; |
5a04cfa9 | 1843 | tape->user_bs_factor = mt_count / tape->blk_size; |
f2e3ab52 | 1844 | clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 | 1845 | } else |
f2e3ab52 | 1846 | set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 BP |
1847 | return 0; |
1848 | case MTSEEK: | |
ec0fdb01 | 1849 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1850 | return idetape_position_tape(drive, |
1851 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1852 | case MTSETPART: | |
ec0fdb01 | 1853 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1854 | return idetape_position_tape(drive, 0, mt_count, 0); |
1855 | case MTFSR: | |
1856 | case MTBSR: | |
1857 | case MTLOCK: | |
0578042d | 1858 | retval = ide_set_media_lock(drive, disk, 1); |
5a04cfa9 | 1859 | if (retval) |
1da177e4 | 1860 | return retval; |
5a04cfa9 BP |
1861 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1862 | return 0; | |
1863 | case MTUNLOCK: | |
0578042d | 1864 | retval = ide_set_media_lock(drive, disk, 0); |
5a04cfa9 BP |
1865 | if (retval) |
1866 | return retval; | |
1867 | tape->door_locked = DOOR_UNLOCKED; | |
1868 | return 0; | |
1869 | default: | |
1870 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1871 | mt_op); | |
1872 | return -EIO; | |
1da177e4 LT |
1873 | } |
1874 | } | |
1875 | ||
1876 | /* | |
d99c9da2 BP |
1877 | * Our character device ioctls. General mtio.h magnetic io commands are |
1878 | * supported here, and not in the corresponding block interface. Our own | |
1879 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 1880 | */ |
d99c9da2 BP |
1881 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
1882 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
1883 | { |
1884 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1885 | ide_drive_t *drive = tape->drive; | |
1886 | struct mtop mtop; | |
1887 | struct mtget mtget; | |
1888 | struct mtpos mtpos; | |
54bb2074 | 1889 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
1890 | void __user *argp = (void __user *)arg; |
1891 | ||
8004a8c9 | 1892 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 1893 | |
54abf37e | 1894 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 1895 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1896 | idetape_flush_tape_buffers(drive); |
1897 | } | |
1898 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
01a63aeb | 1899 | block_offset = tape->merge_bh_size / |
54bb2074 | 1900 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
1901 | position = idetape_read_position(drive); |
1902 | if (position < 0) | |
1da177e4 LT |
1903 | return -EIO; |
1904 | } | |
1905 | switch (cmd) { | |
5a04cfa9 BP |
1906 | case MTIOCTOP: |
1907 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
1908 | return -EFAULT; | |
1909 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
1910 | case MTIOCGET: | |
1911 | memset(&mtget, 0, sizeof(struct mtget)); | |
1912 | mtget.mt_type = MT_ISSCSI2; | |
1913 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1914 | mtget.mt_dsreg = | |
1915 | ((tape->blk_size * tape->user_bs_factor) | |
1916 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
1917 | ||
1918 | if (tape->drv_write_prot) | |
1919 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
1920 | ||
1921 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
1922 | return -EFAULT; | |
1923 | return 0; | |
1924 | case MTIOCPOS: | |
1925 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1926 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
1927 | return -EFAULT; | |
1928 | return 0; | |
1929 | default: | |
1930 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1931 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 1932 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
1933 | } |
1934 | } | |
1935 | ||
3cffb9ce BP |
1936 | /* |
1937 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
1938 | * block size with the reported value. | |
1939 | */ | |
1940 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
1941 | { | |
1942 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1943 | struct ide_atapi_pc pc; |
3cffb9ce BP |
1944 | |
1945 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2ac07d92 | 1946 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
3cffb9ce | 1947 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
54bb2074 | 1948 | if (tape->blk_size == 0) { |
3cffb9ce BP |
1949 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
1950 | "block size, assuming 32k\n"); | |
54bb2074 | 1951 | tape->blk_size = 32768; |
3cffb9ce BP |
1952 | } |
1953 | return; | |
1954 | } | |
d236d74c BP |
1955 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
1956 | (pc.buf[4 + 6] << 8) + | |
1957 | pc.buf[4 + 7]; | |
1958 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 1959 | } |
1da177e4 | 1960 | |
5a04cfa9 | 1961 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
1962 | { |
1963 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
1964 | ide_drive_t *drive; | |
1965 | idetape_tape_t *tape; | |
1da177e4 LT |
1966 | int retval; |
1967 | ||
8004a8c9 BP |
1968 | if (i >= MAX_HWIFS * MAX_DRIVES) |
1969 | return -ENXIO; | |
1970 | ||
04f4ac9d | 1971 | lock_kernel(); |
8004a8c9 | 1972 | tape = ide_tape_chrdev_get(i); |
04f4ac9d JC |
1973 | if (!tape) { |
1974 | unlock_kernel(); | |
8004a8c9 | 1975 | return -ENXIO; |
04f4ac9d | 1976 | } |
8004a8c9 BP |
1977 | |
1978 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1979 | ||
1da177e4 LT |
1980 | /* |
1981 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1982 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1983 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1984 | */ | |
1985 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1986 | ||
1da177e4 LT |
1987 | drive = tape->drive; |
1988 | ||
1989 | filp->private_data = tape; | |
1990 | ||
f2e3ab52 | 1991 | if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { |
1da177e4 LT |
1992 | retval = -EBUSY; |
1993 | goto out_put_tape; | |
1994 | } | |
1995 | ||
1996 | retval = idetape_wait_ready(drive, 60 * HZ); | |
1997 | if (retval) { | |
f2e3ab52 | 1998 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1999 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
2000 | goto out_put_tape; | |
2001 | } | |
2002 | ||
2003 | idetape_read_position(drive); | |
f2e3ab52 | 2004 | if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) |
1da177e4 LT |
2005 | (void)idetape_rewind_tape(drive); |
2006 | ||
1da177e4 | 2007 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 2008 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
2009 | |
2010 | /* Set write protect flag if device is opened as read-only. */ | |
2011 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
2012 | tape->write_prot = 1; | |
2013 | else | |
2014 | tape->write_prot = tape->drv_write_prot; | |
2015 | ||
2016 | /* Make sure drive isn't write protected if user wants to write. */ | |
2017 | if (tape->write_prot) { | |
2018 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
2019 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
f2e3ab52 | 2020 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2021 | retval = -EROFS; |
2022 | goto out_put_tape; | |
2023 | } | |
2024 | } | |
2025 | ||
3c98bf34 | 2026 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 2027 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
0578042d | 2028 | if (!ide_set_media_lock(drive, tape->disk, 1)) { |
385a4b87 BZ |
2029 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
2030 | tape->door_locked = DOOR_LOCKED; | |
1da177e4 LT |
2031 | } |
2032 | } | |
04f4ac9d | 2033 | unlock_kernel(); |
1da177e4 LT |
2034 | return 0; |
2035 | ||
2036 | out_put_tape: | |
2037 | ide_tape_put(tape); | |
04f4ac9d | 2038 | unlock_kernel(); |
1da177e4 LT |
2039 | return retval; |
2040 | } | |
2041 | ||
5a04cfa9 | 2042 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
2043 | { |
2044 | idetape_tape_t *tape = drive->driver_data; | |
2045 | ||
d9df937a | 2046 | ide_tape_flush_merge_buffer(drive); |
077e3bdb BP |
2047 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); |
2048 | if (tape->merge_bh != NULL) { | |
54bb2074 BP |
2049 | idetape_pad_zeros(drive, tape->blk_size * |
2050 | (tape->user_bs_factor - 1)); | |
077e3bdb BP |
2051 | ide_tape_kfree_buffer(tape); |
2052 | tape->merge_bh = NULL; | |
1da177e4 LT |
2053 | } |
2054 | idetape_write_filemark(drive); | |
2055 | idetape_flush_tape_buffers(drive); | |
2056 | idetape_flush_tape_buffers(drive); | |
2057 | } | |
2058 | ||
5a04cfa9 | 2059 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 LT |
2060 | { |
2061 | struct ide_tape_obj *tape = ide_tape_f(filp); | |
2062 | ide_drive_t *drive = tape->drive; | |
1da177e4 LT |
2063 | unsigned int minor = iminor(inode); |
2064 | ||
2065 | lock_kernel(); | |
2066 | tape = drive->driver_data; | |
8004a8c9 BP |
2067 | |
2068 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 2069 | |
54abf37e | 2070 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 2071 | idetape_write_release(drive, minor); |
54abf37e | 2072 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 2073 | if (minor < 128) |
ec0fdb01 | 2074 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 2075 | } |
f64eee7b | 2076 | |
f2e3ab52 | 2077 | if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) |
1da177e4 | 2078 | (void) idetape_rewind_tape(drive); |
54abf37e | 2079 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 | 2080 | if (tape->door_locked == DOOR_LOCKED) { |
0578042d | 2081 | if (!ide_set_media_lock(drive, tape->disk, 0)) |
385a4b87 | 2082 | tape->door_locked = DOOR_UNLOCKED; |
1da177e4 LT |
2083 | } |
2084 | } | |
f2e3ab52 | 2085 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2086 | ide_tape_put(tape); |
2087 | unlock_kernel(); | |
2088 | return 0; | |
2089 | } | |
2090 | ||
6d29c8f0 | 2091 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 2092 | { |
1da177e4 | 2093 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 2094 | struct ide_atapi_pc pc; |
801bd32e | 2095 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 2096 | |
1da177e4 | 2097 | idetape_create_inquiry_cmd(&pc); |
2ac07d92 | 2098 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
6d29c8f0 BP |
2099 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
2100 | tape->name); | |
1da177e4 LT |
2101 | return; |
2102 | } | |
d236d74c BP |
2103 | memcpy(vendor_id, &pc.buf[8], 8); |
2104 | memcpy(product_id, &pc.buf[16], 16); | |
2105 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 | 2106 | |
801bd32e BP |
2107 | ide_fixstring(vendor_id, 8, 0); |
2108 | ide_fixstring(product_id, 16, 0); | |
2109 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 2110 | |
801bd32e | 2111 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 2112 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
2113 | } |
2114 | ||
2115 | /* | |
b6422013 BP |
2116 | * Ask the tape about its various parameters. In particular, we will adjust our |
2117 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 2118 | */ |
5a04cfa9 | 2119 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
2120 | { |
2121 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2122 | struct ide_atapi_pc pc; |
b6422013 BP |
2123 | u8 *caps; |
2124 | u8 speed, max_speed; | |
47314fa4 | 2125 | |
1da177e4 | 2126 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2ac07d92 | 2127 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
b6422013 BP |
2128 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
2129 | " some default values\n"); | |
54bb2074 | 2130 | tape->blk_size = 512; |
b6422013 BP |
2131 | put_unaligned(52, (u16 *)&tape->caps[12]); |
2132 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2133 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
2134 | return; |
2135 | } | |
d236d74c | 2136 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
2137 | |
2138 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
2139 | speed = be16_to_cpup((__be16 *)&caps[14]); |
2140 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 2141 | |
cd740ab0 HH |
2142 | *(u16 *)&caps[8] = max_speed; |
2143 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
2144 | *(u16 *)&caps[14] = speed; | |
2145 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 2146 | |
b6422013 BP |
2147 | if (!speed) { |
2148 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2149 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2150 | *(u16 *)&caps[14] = 650; |
1da177e4 | 2151 | } |
b6422013 BP |
2152 | if (!max_speed) { |
2153 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2154 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2155 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
2156 | } |
2157 | ||
b6422013 | 2158 | memcpy(&tape->caps, caps, 20); |
0578042d BZ |
2159 | |
2160 | /* device lacks locking support according to capabilities page */ | |
2161 | if ((caps[6] & 1) == 0) | |
2162 | drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK; | |
2163 | ||
b6422013 | 2164 | if (caps[7] & 0x02) |
54bb2074 | 2165 | tape->blk_size = 512; |
b6422013 | 2166 | else if (caps[7] & 0x04) |
54bb2074 | 2167 | tape->blk_size = 1024; |
1da177e4 LT |
2168 | } |
2169 | ||
7662d046 | 2170 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
2171 | #define ide_tape_devset_get(name, field) \ |
2172 | static int get_##name(ide_drive_t *drive) \ | |
2173 | { \ | |
2174 | idetape_tape_t *tape = drive->driver_data; \ | |
2175 | return tape->field; \ | |
2176 | } | |
2177 | ||
2178 | #define ide_tape_devset_set(name, field) \ | |
2179 | static int set_##name(ide_drive_t *drive, int arg) \ | |
2180 | { \ | |
2181 | idetape_tape_t *tape = drive->driver_data; \ | |
2182 | tape->field = arg; \ | |
2183 | return 0; \ | |
2184 | } | |
2185 | ||
92f1f8fd | 2186 | #define ide_tape_devset_rw_field(_name, _field) \ |
8185d5aa BZ |
2187 | ide_tape_devset_get(_name, _field) \ |
2188 | ide_tape_devset_set(_name, _field) \ | |
92f1f8fd | 2189 | IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) |
8185d5aa | 2190 | |
92f1f8fd | 2191 | #define ide_tape_devset_r_field(_name, _field) \ |
8185d5aa | 2192 | ide_tape_devset_get(_name, _field) \ |
92f1f8fd | 2193 | IDE_DEVSET(_name, 0, get_##_name, NULL) |
8185d5aa BZ |
2194 | |
2195 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
2196 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
2197 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
2198 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
2199 | ||
92f1f8fd EO |
2200 | ide_devset_rw_field(dsc_overlap, dsc_overlap); |
2201 | ||
2202 | ide_tape_devset_rw_field(debug_mask, debug_mask); | |
2203 | ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); | |
2204 | ||
2205 | ide_tape_devset_r_field(avg_speed, avg_speed); | |
2206 | ide_tape_devset_r_field(speed, caps[14]); | |
2207 | ide_tape_devset_r_field(buffer, caps[16]); | |
2208 | ide_tape_devset_r_field(buffer_size, buffer_size); | |
2209 | ||
2210 | static const struct ide_proc_devset idetape_settings[] = { | |
2211 | __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), | |
2212 | __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), | |
2213 | __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), | |
2214 | __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), | |
2215 | __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), | |
2216 | __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), | |
2217 | __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
2218 | mulf_tdsc, divf_tdsc), | |
2219 | { 0 }, | |
8185d5aa | 2220 | }; |
7662d046 | 2221 | #endif |
1da177e4 LT |
2222 | |
2223 | /* | |
3c98bf34 | 2224 | * The function below is called to: |
1da177e4 | 2225 | * |
3c98bf34 BP |
2226 | * 1. Initialize our various state variables. |
2227 | * 2. Ask the tape for its capabilities. | |
2228 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2229 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 2230 | * |
3c98bf34 BP |
2231 | * Note that at this point ide.c already assigned us an irq, so that we can |
2232 | * queue requests here and wait for their completion. | |
1da177e4 | 2233 | */ |
5a04cfa9 | 2234 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 2235 | { |
83042b24 | 2236 | unsigned long t; |
1da177e4 | 2237 | int speed; |
f73850a3 | 2238 | int buffer_size; |
71071b8e | 2239 | u8 gcw[2]; |
b6422013 | 2240 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 2241 | |
776bb027 BP |
2242 | drive->pc_callback = ide_tape_callback; |
2243 | ||
54bb2074 | 2244 | spin_lock_init(&tape->lock); |
1da177e4 | 2245 | drive->dsc_overlap = 1; |
4166c199 BZ |
2246 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
2247 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2248 | tape->name); | |
2249 | drive->dsc_overlap = 0; | |
1da177e4 | 2250 | } |
1da177e4 | 2251 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 2252 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
1da177e4 LT |
2253 | drive->dsc_overlap = 0; |
2254 | tape->minor = minor; | |
2255 | tape->name[0] = 'h'; | |
2256 | tape->name[1] = 't'; | |
2257 | tape->name[2] = '0' + minor; | |
54abf37e | 2258 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
4dde4492 BZ |
2259 | |
2260 | *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG]; | |
71071b8e BP |
2261 | |
2262 | /* Command packet DRQ type */ | |
2263 | if (((gcw[0] & 0x60) >> 5) == 1) | |
f2e3ab52 | 2264 | set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags); |
1da177e4 | 2265 | |
1da177e4 LT |
2266 | idetape_get_inquiry_results(drive); |
2267 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 2268 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 2269 | tape->user_bs_factor = 1; |
f73850a3 BP |
2270 | tape->buffer_size = *ctl * tape->blk_size; |
2271 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 2272 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 2273 | *ctl /= 2; |
f73850a3 | 2274 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 2275 | } |
f73850a3 | 2276 | buffer_size = tape->buffer_size; |
a997a435 | 2277 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
f73850a3 | 2278 | if (buffer_size % PAGE_SIZE) { |
a997a435 | 2279 | tape->pages_per_buffer++; |
f73850a3 | 2280 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
1da177e4 LT |
2281 | } |
2282 | ||
83042b24 | 2283 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 2284 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 2285 | |
f73850a3 | 2286 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
2287 | |
2288 | /* | |
3c98bf34 BP |
2289 | * Ensure that the number we got makes sense; limit it within |
2290 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 2291 | */ |
a792bd5a HH |
2292 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
2293 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 2294 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 2295 | "%lums tDSC%s\n", |
b6422013 | 2296 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
2297 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
2298 | tape->buffer_size / 1024, | |
54bb2074 | 2299 | tape->best_dsc_rw_freq * 1000 / HZ, |
1da177e4 LT |
2300 | drive->using_dma ? ", DMA":""); |
2301 | ||
1e874f44 | 2302 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
2303 | } |
2304 | ||
4031bbe4 | 2305 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
2306 | { |
2307 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 2308 | |
7662d046 | 2309 | ide_proc_unregister_driver(drive, tape->driver); |
1da177e4 LT |
2310 | |
2311 | ide_unregister_region(tape->disk); | |
2312 | ||
2313 | ide_tape_put(tape); | |
1da177e4 LT |
2314 | } |
2315 | ||
2316 | static void ide_tape_release(struct kref *kref) | |
2317 | { | |
2318 | struct ide_tape_obj *tape = to_ide_tape(kref); | |
2319 | ide_drive_t *drive = tape->drive; | |
2320 | struct gendisk *g = tape->disk; | |
2321 | ||
01a63aeb | 2322 | BUG_ON(tape->merge_bh_size); |
8604affd | 2323 | |
1da177e4 LT |
2324 | drive->dsc_overlap = 0; |
2325 | drive->driver_data = NULL; | |
dbc1272e | 2326 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
2327 | device_destroy(idetape_sysfs_class, |
2328 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
2329 | idetape_devs[tape->minor] = NULL; |
2330 | g->private_data = NULL; | |
2331 | put_disk(g); | |
2332 | kfree(tape); | |
2333 | } | |
2334 | ||
ecfd80e4 | 2335 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
2336 | static int proc_idetape_read_name |
2337 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2338 | { | |
2339 | ide_drive_t *drive = (ide_drive_t *) data; | |
2340 | idetape_tape_t *tape = drive->driver_data; | |
2341 | char *out = page; | |
2342 | int len; | |
2343 | ||
2344 | len = sprintf(out, "%s\n", tape->name); | |
2345 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2346 | } | |
2347 | ||
2348 | static ide_proc_entry_t idetape_proc[] = { | |
2349 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2350 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2351 | { NULL, 0, NULL, NULL } | |
2352 | }; | |
1da177e4 LT |
2353 | #endif |
2354 | ||
4031bbe4 | 2355 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 2356 | |
1da177e4 | 2357 | static ide_driver_t idetape_driver = { |
8604affd | 2358 | .gen_driver = { |
4ef3b8f4 | 2359 | .owner = THIS_MODULE, |
8604affd BZ |
2360 | .name = "ide-tape", |
2361 | .bus = &ide_bus_type, | |
8604affd | 2362 | }, |
4031bbe4 RK |
2363 | .probe = ide_tape_probe, |
2364 | .remove = ide_tape_remove, | |
1da177e4 LT |
2365 | .version = IDETAPE_VERSION, |
2366 | .media = ide_tape, | |
1da177e4 LT |
2367 | .do_request = idetape_do_request, |
2368 | .end_request = idetape_end_request, | |
2369 | .error = __ide_error, | |
7662d046 | 2370 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 | 2371 | .proc = idetape_proc, |
8185d5aa | 2372 | .settings = idetape_settings, |
7662d046 | 2373 | #endif |
1da177e4 LT |
2374 | }; |
2375 | ||
3c98bf34 | 2376 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 2377 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
2378 | .owner = THIS_MODULE, |
2379 | .read = idetape_chrdev_read, | |
2380 | .write = idetape_chrdev_write, | |
2381 | .ioctl = idetape_chrdev_ioctl, | |
2382 | .open = idetape_chrdev_open, | |
2383 | .release = idetape_chrdev_release, | |
2384 | }; | |
2385 | ||
2386 | static int idetape_open(struct inode *inode, struct file *filp) | |
2387 | { | |
2388 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2389 | struct ide_tape_obj *tape; | |
1da177e4 | 2390 | |
5a04cfa9 BP |
2391 | tape = ide_tape_get(disk); |
2392 | if (!tape) | |
1da177e4 LT |
2393 | return -ENXIO; |
2394 | ||
1da177e4 LT |
2395 | return 0; |
2396 | } | |
2397 | ||
2398 | static int idetape_release(struct inode *inode, struct file *filp) | |
2399 | { | |
2400 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2401 | struct ide_tape_obj *tape = ide_tape_g(disk); | |
1da177e4 LT |
2402 | |
2403 | ide_tape_put(tape); | |
2404 | ||
2405 | return 0; | |
2406 | } | |
2407 | ||
2408 | static int idetape_ioctl(struct inode *inode, struct file *file, | |
2409 | unsigned int cmd, unsigned long arg) | |
2410 | { | |
2411 | struct block_device *bdev = inode->i_bdev; | |
2412 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); | |
2413 | ide_drive_t *drive = tape->drive; | |
2414 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); | |
2415 | if (err == -EINVAL) | |
2416 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2417 | return err; | |
2418 | } | |
2419 | ||
2420 | static struct block_device_operations idetape_block_ops = { | |
2421 | .owner = THIS_MODULE, | |
2422 | .open = idetape_open, | |
2423 | .release = idetape_release, | |
2424 | .ioctl = idetape_ioctl, | |
2425 | }; | |
2426 | ||
4031bbe4 | 2427 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2428 | { |
2429 | idetape_tape_t *tape; | |
2430 | struct gendisk *g; | |
2431 | int minor; | |
2432 | ||
2433 | if (!strstr("ide-tape", drive->driver_req)) | |
2434 | goto failed; | |
2a924662 | 2435 | |
1da177e4 LT |
2436 | if (drive->media != ide_tape) |
2437 | goto failed; | |
2a924662 | 2438 | |
51509eec | 2439 | if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) { |
5a04cfa9 BP |
2440 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
2441 | " the driver\n", drive->name); | |
1da177e4 LT |
2442 | goto failed; |
2443 | } | |
5a04cfa9 | 2444 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2445 | if (tape == NULL) { |
5a04cfa9 BP |
2446 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2447 | drive->name); | |
1da177e4 LT |
2448 | goto failed; |
2449 | } | |
2450 | ||
2451 | g = alloc_disk(1 << PARTN_BITS); | |
2452 | if (!g) | |
2453 | goto out_free_tape; | |
2454 | ||
2455 | ide_init_disk(g, drive); | |
2456 | ||
1da177e4 LT |
2457 | kref_init(&tape->kref); |
2458 | ||
2459 | tape->drive = drive; | |
2460 | tape->driver = &idetape_driver; | |
2461 | tape->disk = g; | |
2462 | ||
2463 | g->private_data = &tape->driver; | |
2464 | ||
2465 | drive->driver_data = tape; | |
2466 | ||
cf8b8975 | 2467 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2468 | for (minor = 0; idetape_devs[minor]; minor++) |
2469 | ; | |
2470 | idetape_devs[minor] = tape; | |
cf8b8975 | 2471 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2472 | |
2473 | idetape_setup(drive, tape, minor); | |
2474 | ||
6ecaaf94 GKH |
2475 | device_create_drvdata(idetape_sysfs_class, &drive->gendev, |
2476 | MKDEV(IDETAPE_MAJOR, minor), NULL, | |
2477 | "%s", tape->name); | |
2478 | device_create_drvdata(idetape_sysfs_class, &drive->gendev, | |
2479 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
2480 | "n%s", tape->name); | |
d5dee80a | 2481 | |
1da177e4 LT |
2482 | g->fops = &idetape_block_ops; |
2483 | ide_register_region(g); | |
2484 | ||
2485 | return 0; | |
8604affd | 2486 | |
1da177e4 LT |
2487 | out_free_tape: |
2488 | kfree(tape); | |
2489 | failed: | |
8604affd | 2490 | return -ENODEV; |
1da177e4 LT |
2491 | } |
2492 | ||
5a04cfa9 | 2493 | static void __exit idetape_exit(void) |
1da177e4 | 2494 | { |
8604affd | 2495 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2496 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2497 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2498 | } | |
2499 | ||
17514e8a | 2500 | static int __init idetape_init(void) |
1da177e4 | 2501 | { |
d5dee80a WD |
2502 | int error = 1; |
2503 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2504 | if (IS_ERR(idetape_sysfs_class)) { | |
2505 | idetape_sysfs_class = NULL; | |
2506 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2507 | error = -EBUSY; | |
2508 | goto out; | |
2509 | } | |
2510 | ||
1da177e4 | 2511 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2512 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2513 | " interface\n"); | |
d5dee80a WD |
2514 | error = -EBUSY; |
2515 | goto out_free_class; | |
1da177e4 | 2516 | } |
d5dee80a WD |
2517 | |
2518 | error = driver_register(&idetape_driver.gen_driver); | |
2519 | if (error) | |
2520 | goto out_free_driver; | |
2521 | ||
2522 | return 0; | |
2523 | ||
2524 | out_free_driver: | |
2525 | driver_unregister(&idetape_driver.gen_driver); | |
2526 | out_free_class: | |
2527 | class_destroy(idetape_sysfs_class); | |
2528 | out: | |
2529 | return error; | |
1da177e4 LT |
2530 | } |
2531 | ||
263756ec | 2532 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2533 | module_init(idetape_init); |
2534 | module_exit(idetape_exit); | |
2535 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2536 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2537 | MODULE_LICENSE("GPL"); |