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 { | |
7f3c868b BZ |
169 | ide_drive_t *drive; |
170 | struct ide_driver *driver; | |
171 | struct gendisk *disk; | |
8fed4368 | 172 | struct device dev; |
1da177e4 | 173 | |
2e8a6f89 BZ |
174 | /* used by REQ_IDETAPE_{READ,WRITE} requests */ |
175 | struct ide_atapi_pc queued_pc; | |
394a4c21 | 176 | |
1da177e4 | 177 | /* |
3c98bf34 | 178 | * DSC polling variables. |
1da177e4 | 179 | * |
3c98bf34 BP |
180 | * While polling for DSC we use postponed_rq to postpone the current |
181 | * request so that ide.c will be able to service pending requests on the | |
182 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 183 | * data transfer) request in the device request queue. |
1da177e4 LT |
184 | */ |
185 | struct request *postponed_rq; | |
186 | /* The time in which we started polling for DSC */ | |
187 | unsigned long dsc_polling_start; | |
188 | /* Timer used to poll for dsc */ | |
189 | struct timer_list dsc_timer; | |
190 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
191 | unsigned long best_dsc_rw_freq; |
192 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
193 | unsigned long dsc_timeout; |
194 | ||
3c98bf34 | 195 | /* Read position information */ |
1da177e4 LT |
196 | u8 partition; |
197 | /* Current block */ | |
54bb2074 | 198 | unsigned int first_frame; |
1da177e4 | 199 | |
3c98bf34 | 200 | /* Last error information */ |
1da177e4 LT |
201 | u8 sense_key, asc, ascq; |
202 | ||
3c98bf34 | 203 | /* Character device operation */ |
1da177e4 LT |
204 | unsigned int minor; |
205 | /* device name */ | |
206 | char name[4]; | |
207 | /* Current character device data transfer direction */ | |
54abf37e | 208 | u8 chrdev_dir; |
1da177e4 | 209 | |
54bb2074 BP |
210 | /* tape block size, usually 512 or 1024 bytes */ |
211 | unsigned short blk_size; | |
1da177e4 | 212 | int user_bs_factor; |
b6422013 | 213 | |
1da177e4 | 214 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 215 | u8 caps[20]; |
1da177e4 LT |
216 | |
217 | /* | |
3c98bf34 | 218 | * Active data transfer request parameters. |
1da177e4 | 219 | * |
3c98bf34 BP |
220 | * At most, there is only one ide-tape originated data transfer request |
221 | * in the device request queue. This allows ide.c to easily service | |
222 | * requests from the other device when we postpone our active request. | |
1da177e4 | 223 | */ |
83042b24 | 224 | |
3c98bf34 | 225 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 226 | int buffer_size; |
077e3bdb BP |
227 | /* merge buffer */ |
228 | struct idetape_bh *merge_bh; | |
01a63aeb BP |
229 | /* size of the merge buffer */ |
230 | int merge_bh_size; | |
077e3bdb | 231 | /* pointer to current buffer head within the merge buffer */ |
1da177e4 LT |
232 | struct idetape_bh *bh; |
233 | char *b_data; | |
234 | int b_count; | |
3c98bf34 | 235 | |
a997a435 | 236 | int pages_per_buffer; |
1da177e4 LT |
237 | /* Wasted space in each stage */ |
238 | int excess_bh_size; | |
239 | ||
3c98bf34 | 240 | /* Measures average tape speed */ |
1da177e4 LT |
241 | unsigned long avg_time; |
242 | int avg_size; | |
243 | int avg_speed; | |
244 | ||
1da177e4 LT |
245 | /* the door is currently locked */ |
246 | int door_locked; | |
247 | /* the tape hardware is write protected */ | |
248 | char drv_write_prot; | |
249 | /* the tape is write protected (hardware or opened as read-only) */ | |
250 | char write_prot; | |
251 | ||
8004a8c9 | 252 | u32 debug_mask; |
1da177e4 LT |
253 | } idetape_tape_t; |
254 | ||
cf8b8975 | 255 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 256 | |
d5dee80a WD |
257 | static struct class *idetape_sysfs_class; |
258 | ||
8fed4368 | 259 | static void ide_tape_release(struct device *); |
08da591e | 260 | |
1da177e4 LT |
261 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
262 | { | |
263 | struct ide_tape_obj *tape = NULL; | |
264 | ||
cf8b8975 | 265 | mutex_lock(&idetape_ref_mutex); |
5aeddf90 | 266 | tape = ide_drv_g(disk, ide_tape_obj); |
08da591e | 267 | if (tape) { |
d3e33ff5 | 268 | if (ide_device_get(tape->drive)) |
08da591e | 269 | tape = NULL; |
d3e33ff5 | 270 | else |
8fed4368 | 271 | get_device(&tape->dev); |
08da591e | 272 | } |
cf8b8975 | 273 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
274 | return tape; |
275 | } | |
276 | ||
1da177e4 LT |
277 | static void ide_tape_put(struct ide_tape_obj *tape) |
278 | { | |
d3e33ff5 BZ |
279 | ide_drive_t *drive = tape->drive; |
280 | ||
cf8b8975 | 281 | mutex_lock(&idetape_ref_mutex); |
8fed4368 | 282 | put_device(&tape->dev); |
d3e33ff5 | 283 | ide_device_put(drive); |
cf8b8975 | 284 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
285 | } |
286 | ||
1da177e4 | 287 | /* |
3c98bf34 BP |
288 | * The variables below are used for the character device interface. Additional |
289 | * state variables are defined in our ide_drive_t structure. | |
1da177e4 | 290 | */ |
5a04cfa9 | 291 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
1da177e4 | 292 | |
1da177e4 LT |
293 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) |
294 | { | |
295 | struct ide_tape_obj *tape = NULL; | |
296 | ||
cf8b8975 | 297 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
298 | tape = idetape_devs[i]; |
299 | if (tape) | |
8fed4368 | 300 | get_device(&tape->dev); |
cf8b8975 | 301 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
302 | return tape; |
303 | } | |
304 | ||
d236d74c | 305 | static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 306 | unsigned int bcount) |
1da177e4 LT |
307 | { |
308 | struct idetape_bh *bh = pc->bh; | |
309 | int count; | |
310 | ||
311 | while (bcount) { | |
1da177e4 LT |
312 | if (bh == NULL) { |
313 | printk(KERN_ERR "ide-tape: bh == NULL in " | |
314 | "idetape_input_buffers\n"); | |
9f87abe8 | 315 | ide_pad_transfer(drive, 0, bcount); |
1da177e4 LT |
316 | return; |
317 | } | |
5a04cfa9 BP |
318 | count = min( |
319 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
320 | bcount); | |
374e042c | 321 | drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data + |
5a04cfa9 | 322 | atomic_read(&bh->b_count), count); |
1da177e4 LT |
323 | bcount -= count; |
324 | atomic_add(count, &bh->b_count); | |
325 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
326 | bh = bh->b_reqnext; | |
327 | if (bh) | |
328 | atomic_set(&bh->b_count, 0); | |
329 | } | |
330 | } | |
331 | pc->bh = bh; | |
332 | } | |
333 | ||
d236d74c | 334 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 335 | unsigned int bcount) |
1da177e4 LT |
336 | { |
337 | struct idetape_bh *bh = pc->bh; | |
338 | int count; | |
339 | ||
340 | while (bcount) { | |
1da177e4 | 341 | if (bh == NULL) { |
5a04cfa9 BP |
342 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
343 | __func__); | |
1da177e4 LT |
344 | return; |
345 | } | |
1da177e4 | 346 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
374e042c | 347 | drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); |
1da177e4 LT |
348 | bcount -= count; |
349 | pc->b_data += count; | |
350 | pc->b_count -= count; | |
351 | if (!pc->b_count) { | |
5a04cfa9 BP |
352 | bh = bh->b_reqnext; |
353 | pc->bh = bh; | |
1da177e4 LT |
354 | if (bh) { |
355 | pc->b_data = bh->b_data; | |
356 | pc->b_count = atomic_read(&bh->b_count); | |
357 | } | |
358 | } | |
359 | } | |
360 | } | |
361 | ||
646c0cb6 | 362 | static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
363 | { |
364 | struct idetape_bh *bh = pc->bh; | |
365 | int count; | |
d236d74c | 366 | unsigned int bcount = pc->xferred; |
1da177e4 | 367 | |
346331f8 | 368 | if (pc->flags & PC_FLAG_WRITING) |
1da177e4 LT |
369 | return; |
370 | while (bcount) { | |
1da177e4 | 371 | if (bh == NULL) { |
5a04cfa9 BP |
372 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
373 | __func__); | |
1da177e4 LT |
374 | return; |
375 | } | |
1da177e4 LT |
376 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
377 | atomic_set(&bh->b_count, count); | |
378 | if (atomic_read(&bh->b_count) == bh->b_size) | |
379 | bh = bh->b_reqnext; | |
380 | bcount -= count; | |
381 | } | |
382 | pc->bh = bh; | |
383 | } | |
384 | ||
1da177e4 | 385 | /* |
1b5db434 BP |
386 | * called on each failed packet command retry to analyze the request sense. We |
387 | * currently do not utilize this information. | |
1da177e4 | 388 | */ |
1b5db434 | 389 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
390 | { |
391 | idetape_tape_t *tape = drive->driver_data; | |
5e2040fd | 392 | struct ide_atapi_pc *pc = drive->failed_pc; |
1da177e4 | 393 | |
1b5db434 BP |
394 | tape->sense_key = sense[2] & 0xF; |
395 | tape->asc = sense[12]; | |
396 | tape->ascq = sense[13]; | |
8004a8c9 BP |
397 | |
398 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
399 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 400 | |
d236d74c | 401 | /* Correct pc->xferred by asking the tape. */ |
346331f8 | 402 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
d236d74c | 403 | pc->xferred = pc->req_xfer - |
54bb2074 | 404 | tape->blk_size * |
5d0cc8ae | 405 | get_unaligned_be32(&sense[3]); |
646c0cb6 | 406 | idetape_update_buffers(drive, pc); |
1da177e4 LT |
407 | } |
408 | ||
409 | /* | |
410 | * If error was the result of a zero-length read or write command, | |
411 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
412 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
413 | */ | |
90699ce2 | 414 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
415 | /* length == 0 */ |
416 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
417 | if (tape->sense_key == 5) { | |
1da177e4 LT |
418 | /* don't report an error, everything's ok */ |
419 | pc->error = 0; | |
420 | /* don't retry read/write */ | |
346331f8 | 421 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
422 | } |
423 | } | |
90699ce2 | 424 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
1da177e4 | 425 | pc->error = IDETAPE_ERROR_FILEMARK; |
346331f8 | 426 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 427 | } |
90699ce2 | 428 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
429 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
430 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
1da177e4 | 431 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 432 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
433 | } |
434 | } | |
90699ce2 | 435 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 436 | if (tape->sense_key == 8) { |
1da177e4 | 437 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 438 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 439 | } |
346331f8 | 440 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 441 | pc->xferred) |
1da177e4 LT |
442 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
443 | } | |
444 | } | |
445 | ||
d01dbc3b | 446 | /* Free data buffers completely. */ |
077e3bdb | 447 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) |
1da177e4 | 448 | { |
077e3bdb | 449 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; |
d01dbc3b BP |
450 | |
451 | while (bh) { | |
452 | u32 size = bh->b_size; | |
453 | ||
454 | while (size) { | |
455 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
456 | ||
457 | if (bh->b_data) | |
458 | free_pages((unsigned long)bh->b_data, order); | |
459 | ||
460 | size &= (order-1); | |
461 | bh->b_data += (1 << order) * PAGE_SIZE; | |
1da177e4 LT |
462 | } |
463 | prev_bh = bh; | |
464 | bh = bh->b_reqnext; | |
465 | kfree(prev_bh); | |
466 | } | |
1da177e4 LT |
467 | } |
468 | ||
1da177e4 LT |
469 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
470 | { | |
b65fac32 | 471 | struct request *rq = drive->hwif->rq; |
1da177e4 | 472 | int error; |
1da177e4 | 473 | |
8004a8c9 | 474 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
475 | |
476 | switch (uptodate) { | |
5a04cfa9 BP |
477 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
478 | case 1: error = 0; break; | |
479 | default: error = uptodate; | |
1da177e4 LT |
480 | } |
481 | rq->errors = error; | |
482 | if (error) | |
5e2040fd | 483 | drive->failed_pc = NULL; |
1da177e4 | 484 | |
3687221f BZ |
485 | if (!blk_special_request(rq)) { |
486 | ide_end_request(drive, uptodate, nr_sects); | |
487 | return 0; | |
488 | } | |
489 | ||
a09485df | 490 | ide_complete_rq(drive, 0); |
1da177e4 | 491 | |
1da177e4 LT |
492 | return 0; |
493 | } | |
494 | ||
b14c7212 BZ |
495 | static void ide_tape_handle_dsc(ide_drive_t *); |
496 | ||
497 | static void ide_tape_callback(ide_drive_t *drive, int dsc) | |
1da177e4 LT |
498 | { |
499 | idetape_tape_t *tape = drive->driver_data; | |
2b9efba4 | 500 | struct ide_atapi_pc *pc = drive->pc; |
5985e6ab | 501 | int uptodate = pc->error ? 0 : 1; |
1da177e4 | 502 | |
8004a8c9 BP |
503 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
504 | ||
b14c7212 BZ |
505 | if (dsc) |
506 | ide_tape_handle_dsc(drive); | |
507 | ||
5e2040fd BZ |
508 | if (drive->failed_pc == pc) |
509 | drive->failed_pc = NULL; | |
dd2e9a03 | 510 | |
5985e6ab BZ |
511 | if (pc->c[0] == REQUEST_SENSE) { |
512 | if (uptodate) | |
513 | idetape_analyze_error(drive, pc->buf); | |
514 | else | |
515 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
516 | "itself - Aborting request!\n"); | |
517 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
b65fac32 | 518 | struct request *rq = drive->hwif->rq; |
5985e6ab BZ |
519 | int blocks = pc->xferred / tape->blk_size; |
520 | ||
521 | tape->avg_size += blocks * tape->blk_size; | |
522 | ||
523 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
524 | tape->avg_speed = tape->avg_size * HZ / | |
525 | (jiffies - tape->avg_time) / 1024; | |
526 | tape->avg_size = 0; | |
527 | tape->avg_time = jiffies; | |
528 | } | |
529 | ||
530 | tape->first_frame += blocks; | |
531 | rq->current_nr_sectors -= blocks; | |
532 | ||
533 | if (pc->error) | |
534 | uptodate = pc->error; | |
535 | } else if (pc->c[0] == READ_POSITION && uptodate) { | |
2b9efba4 | 536 | u8 *readpos = pc->buf; |
5985e6ab BZ |
537 | |
538 | debug_log(DBG_SENSE, "BOP - %s\n", | |
539 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
540 | debug_log(DBG_SENSE, "EOP - %s\n", | |
541 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
542 | ||
543 | if (readpos[0] & 0x4) { | |
544 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
545 | "to the tape\n"); | |
f2e3ab52 | 546 | clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab BZ |
547 | uptodate = 0; |
548 | } else { | |
549 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
cd740ab0 | 550 | be32_to_cpup((__be32 *)&readpos[4])); |
5985e6ab BZ |
551 | |
552 | tape->partition = readpos[1]; | |
cd740ab0 | 553 | tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); |
f2e3ab52 | 554 | set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 555 | } |
1da177e4 | 556 | } |
5985e6ab BZ |
557 | |
558 | idetape_end_request(drive, uptodate, 0); | |
1da177e4 LT |
559 | } |
560 | ||
1da177e4 | 561 | /* |
3c98bf34 | 562 | * Postpone the current request so that ide.c will be able to service requests |
b65fac32 | 563 | * from another device on the same port while we are polling for DSC. |
1da177e4 | 564 | */ |
5a04cfa9 | 565 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
566 | { |
567 | idetape_tape_t *tape = drive->driver_data; | |
568 | ||
8004a8c9 BP |
569 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
570 | ||
b65fac32 BZ |
571 | tape->postponed_rq = drive->hwif->rq; |
572 | ||
54bb2074 | 573 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
574 | } |
575 | ||
74e63e74 BZ |
576 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
577 | { | |
578 | idetape_tape_t *tape = drive->driver_data; | |
579 | ||
580 | /* Media access command */ | |
581 | tape->dsc_polling_start = jiffies; | |
582 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
583 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
584 | /* Allow ide.c to handle other requests */ | |
585 | idetape_postpone_request(drive); | |
586 | } | |
587 | ||
acaa0f5f | 588 | static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
08424ac2 BZ |
589 | unsigned int bcount, int write) |
590 | { | |
591 | if (write) | |
592 | idetape_output_buffers(drive, pc, bcount); | |
593 | else | |
594 | idetape_input_buffers(drive, pc, bcount); | |
acaa0f5f BZ |
595 | |
596 | return bcount; | |
08424ac2 | 597 | } |
a1efc85f | 598 | |
1da177e4 | 599 | /* |
3c98bf34 | 600 | * Packet Command Interface |
1da177e4 | 601 | * |
2b9efba4 | 602 | * The current Packet Command is available in drive->pc, and will not change |
3c98bf34 BP |
603 | * until we finish handling it. Each packet command is associated with a |
604 | * callback function that will be called when the command is finished. | |
1da177e4 | 605 | * |
3c98bf34 | 606 | * The handling will be done in three stages: |
1da177e4 | 607 | * |
3c98bf34 | 608 | * 1. idetape_issue_pc will send the packet command to the drive, and will set |
aa5d2de7 | 609 | * the interrupt handler to ide_pc_intr. |
1da177e4 | 610 | * |
aa5d2de7 | 611 | * 2. On each interrupt, ide_pc_intr will be called. This step will be |
3c98bf34 | 612 | * repeated until the device signals us that no more interrupts will be issued. |
1da177e4 | 613 | * |
3c98bf34 BP |
614 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
615 | * process. In case of a successful initiation of a media access packet command, | |
616 | * the DSC bit will be set when the actual execution of the command is finished. | |
617 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
618 | * event. In this case, we define the request as "low priority request" by | |
619 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
620 | * exit the driver. | |
1da177e4 | 621 | * |
3c98bf34 BP |
622 | * ide.c will then give higher priority to requests which originate from the |
623 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 624 | * |
3c98bf34 | 625 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 626 | * |
3c98bf34 BP |
627 | * 5. In case an error was found, we queue a request sense packet command in |
628 | * front of the request queue and retry the operation up to | |
629 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 630 | * |
3c98bf34 BP |
631 | * 6. In case no error was found, or we decided to give up and not to retry |
632 | * again, the callback function will be called and then we will handle the next | |
633 | * request. | |
1da177e4 | 634 | */ |
1da177e4 | 635 | |
d236d74c BP |
636 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
637 | struct ide_atapi_pc *pc) | |
1da177e4 | 638 | { |
1da177e4 | 639 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 640 | |
2b9efba4 | 641 | if (drive->pc->c[0] == REQUEST_SENSE && |
90699ce2 | 642 | pc->c[0] == REQUEST_SENSE) { |
1da177e4 LT |
643 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
644 | "Two request sense in serial were issued\n"); | |
645 | } | |
1da177e4 | 646 | |
5e2040fd BZ |
647 | if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
648 | drive->failed_pc = pc; | |
2b9efba4 | 649 | |
1da177e4 | 650 | /* Set the current packet command */ |
2b9efba4 | 651 | drive->pc = pc; |
1da177e4 LT |
652 | |
653 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 654 | (pc->flags & PC_FLAG_ABORT)) { |
1da177e4 | 655 | /* |
3c98bf34 BP |
656 | * We will "abort" retrying a packet command in case legitimate |
657 | * error code was received (crossing a filemark, or end of the | |
658 | * media, for example). | |
1da177e4 | 659 | */ |
346331f8 | 660 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 661 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
662 | tape->sense_key == 2 && tape->asc == 4 && |
663 | (tape->ascq == 1 || tape->ascq == 8))) { | |
664 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
665 | "pc = %2x, key = %2x, " | |
666 | "asc = %2x, ascq = %2x\n", | |
667 | tape->name, pc->c[0], | |
668 | tape->sense_key, tape->asc, | |
669 | tape->ascq); | |
670 | } | |
671 | /* Giving up */ | |
672 | pc->error = IDETAPE_ERROR_GENERAL; | |
673 | } | |
5e2040fd | 674 | drive->failed_pc = NULL; |
b14c7212 | 675 | drive->pc_callback(drive, 0); |
92f5daff | 676 | return ide_stopped; |
1da177e4 | 677 | } |
8004a8c9 | 678 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
679 | |
680 | pc->retries++; | |
1da177e4 | 681 | |
28ad91db | 682 | return ide_issue_pc(drive); |
1da177e4 LT |
683 | } |
684 | ||
3c98bf34 | 685 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 686 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 | 687 | { |
7bf7420a | 688 | ide_init_pc(pc); |
90699ce2 | 689 | pc->c[0] = MODE_SENSE; |
1da177e4 | 690 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
691 | /* DBD = 1 - Don't return block descriptors */ |
692 | pc->c[1] = 8; | |
1da177e4 LT |
693 | pc->c[2] = page_code; |
694 | /* | |
695 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
696 | * | |
697 | * For SCSI this byte is defined as subpage instead of high byte | |
698 | * of length and some IDE drives seem to interpret it this way | |
699 | * and return an error when 255 is used. | |
700 | */ | |
701 | pc->c[3] = 0; | |
3c98bf34 BP |
702 | /* We will just discard data in that case */ |
703 | pc->c[4] = 255; | |
1da177e4 | 704 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 705 | pc->req_xfer = 12; |
1da177e4 | 706 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 707 | pc->req_xfer = 24; |
1da177e4 | 708 | else |
d236d74c | 709 | pc->req_xfer = 50; |
1da177e4 LT |
710 | } |
711 | ||
5a04cfa9 | 712 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 713 | { |
b73c7ee2 | 714 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 715 | idetape_tape_t *tape = drive->driver_data; |
2b9efba4 | 716 | struct ide_atapi_pc *pc = drive->pc; |
22c525b9 | 717 | u8 stat; |
1da177e4 | 718 | |
374e042c | 719 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 720 | |
3a7d2484 BZ |
721 | if (stat & ATA_DSC) { |
722 | if (stat & ATA_ERR) { | |
1da177e4 | 723 | /* Error detected */ |
90699ce2 | 724 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
725 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
726 | tape->name); | |
727 | /* Retry operation */ | |
6b0da28b | 728 | ide_retry_pc(drive, tape->disk); |
258ec411 | 729 | return ide_stopped; |
1da177e4 LT |
730 | } |
731 | pc->error = 0; | |
1da177e4 LT |
732 | } else { |
733 | pc->error = IDETAPE_ERROR_GENERAL; | |
5e2040fd | 734 | drive->failed_pc = NULL; |
1da177e4 | 735 | } |
b14c7212 | 736 | drive->pc_callback(drive, 0); |
1da177e4 LT |
737 | return ide_stopped; |
738 | } | |
739 | ||
cd2abbfe | 740 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
741 | struct ide_atapi_pc *pc, struct request *rq, |
742 | u8 opcode) | |
1da177e4 | 743 | { |
0014c75b BP |
744 | struct idetape_bh *bh = (struct idetape_bh *)rq->special; |
745 | unsigned int length = rq->current_nr_sectors; | |
746 | ||
7bf7420a | 747 | ide_init_pc(pc); |
860ff5ec | 748 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 749 | pc->c[1] = 1; |
1da177e4 | 750 | pc->bh = bh; |
d236d74c BP |
751 | pc->buf = NULL; |
752 | pc->buf_size = length * tape->blk_size; | |
753 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 754 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 755 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 756 | |
cd2abbfe BP |
757 | if (opcode == READ_6) { |
758 | pc->c[0] = READ_6; | |
759 | atomic_set(&bh->b_count, 0); | |
760 | } else if (opcode == WRITE_6) { | |
761 | pc->c[0] = WRITE_6; | |
762 | pc->flags |= PC_FLAG_WRITING; | |
763 | pc->b_data = bh->b_data; | |
764 | pc->b_count = atomic_read(&bh->b_count); | |
765 | } | |
0014c75b BP |
766 | |
767 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
768 | } |
769 | ||
1da177e4 LT |
770 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
771 | struct request *rq, sector_t block) | |
772 | { | |
b73c7ee2 | 773 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 774 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 775 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 776 | struct request *postponed_rq = tape->postponed_rq; |
22c525b9 | 777 | u8 stat; |
1da177e4 | 778 | |
730616b2 MW |
779 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu," |
780 | " current_nr_sectors: %u\n", | |
781 | (unsigned long long)rq->sector, rq->nr_sectors, | |
782 | rq->current_nr_sectors); | |
1da177e4 | 783 | |
4aff5e23 | 784 | if (!blk_special_request(rq)) { |
3c98bf34 | 785 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 786 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 787 | "request queue (%d)\n", drive->name, rq->cmd_type); |
1da177e4 LT |
788 | ide_end_request(drive, 0, 0); |
789 | return ide_stopped; | |
790 | } | |
791 | ||
3c98bf34 | 792 | /* Retry a failed packet command */ |
5e2040fd BZ |
793 | if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { |
794 | pc = drive->failed_pc; | |
28c7214b BZ |
795 | goto out; |
796 | } | |
5a04cfa9 | 797 | |
1da177e4 LT |
798 | if (postponed_rq != NULL) |
799 | if (rq != postponed_rq) { | |
800 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
801 | "Two DSC requests were queued\n"); | |
802 | idetape_end_request(drive, 0, 0); | |
803 | return ide_stopped; | |
804 | } | |
1da177e4 LT |
805 | |
806 | tape->postponed_rq = NULL; | |
807 | ||
808 | /* | |
809 | * If the tape is still busy, postpone our request and service | |
810 | * the other device meanwhile. | |
811 | */ | |
374e042c | 812 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 813 | |
97100fc8 BZ |
814 | if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && |
815 | (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) | |
f2e3ab52 | 816 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 | 817 | |
97100fc8 | 818 | if (drive->dev_flags & IDE_DFLAG_POST_RESET) { |
f2e3ab52 | 819 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
97100fc8 | 820 | drive->dev_flags &= ~IDE_DFLAG_POST_RESET; |
1da177e4 LT |
821 | } |
822 | ||
f2e3ab52 | 823 | if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && |
3a7d2484 | 824 | (stat & ATA_DSC) == 0) { |
1da177e4 LT |
825 | if (postponed_rq == NULL) { |
826 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 827 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
828 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
829 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
830 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
831 | tape->name); | |
83dd5735 | 832 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
833 | idetape_media_access_finished(drive); |
834 | return ide_stopped; | |
835 | } else { | |
836 | return ide_do_reset(drive); | |
837 | } | |
5a04cfa9 BP |
838 | } else if (time_after(jiffies, |
839 | tape->dsc_polling_start + | |
840 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 841 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
842 | idetape_postpone_request(drive); |
843 | return ide_stopped; | |
844 | } | |
83dd5735 | 845 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
2e8a6f89 | 846 | pc = &tape->queued_pc; |
0014c75b | 847 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
848 | goto out; |
849 | } | |
83dd5735 | 850 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
2e8a6f89 | 851 | pc = &tape->queued_pc; |
0014c75b | 852 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
853 | goto out; |
854 | } | |
83dd5735 | 855 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
d236d74c | 856 | pc = (struct ide_atapi_pc *) rq->buffer; |
83dd5735 BP |
857 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
858 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
859 | goto out; |
860 | } | |
83dd5735 | 861 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
862 | idetape_media_access_finished(drive); |
863 | return ide_stopped; | |
864 | } | |
865 | BUG(); | |
28c7214b | 866 | |
f2e3ab52 | 867 | out: |
8d06bfad | 868 | return idetape_issue_pc(drive, pc); |
1da177e4 LT |
869 | } |
870 | ||
1da177e4 | 871 | /* |
41aa1706 | 872 | * The function below uses __get_free_pages to allocate a data buffer of size |
f73850a3 | 873 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
3c98bf34 | 874 | * much as possible. |
1da177e4 | 875 | * |
41aa1706 BP |
876 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
877 | * failure. | |
1da177e4 | 878 | */ |
077e3bdb BP |
879 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, |
880 | int full, int clear) | |
1da177e4 | 881 | { |
077e3bdb | 882 | struct idetape_bh *prev_bh, *bh, *merge_bh; |
a997a435 | 883 | int pages = tape->pages_per_buffer; |
41aa1706 | 884 | unsigned int order, b_allocd; |
1da177e4 LT |
885 | char *b_data = NULL; |
886 | ||
077e3bdb BP |
887 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
888 | bh = merge_bh; | |
1da177e4 LT |
889 | if (bh == NULL) |
890 | goto abort; | |
41aa1706 BP |
891 | |
892 | order = fls(pages) - 1; | |
893 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 894 | if (!bh->b_data) |
1da177e4 | 895 | goto abort; |
41aa1706 BP |
896 | b_allocd = (1 << order) * PAGE_SIZE; |
897 | pages &= (order-1); | |
898 | ||
1da177e4 | 899 | if (clear) |
41aa1706 BP |
900 | memset(bh->b_data, 0, b_allocd); |
901 | bh->b_reqnext = NULL; | |
902 | bh->b_size = b_allocd; | |
1da177e4 LT |
903 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
904 | ||
41aa1706 BP |
905 | while (pages) { |
906 | order = fls(pages) - 1; | |
907 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 908 | if (!b_data) |
1da177e4 | 909 | goto abort; |
41aa1706 BP |
910 | b_allocd = (1 << order) * PAGE_SIZE; |
911 | ||
1da177e4 | 912 | if (clear) |
41aa1706 BP |
913 | memset(b_data, 0, b_allocd); |
914 | ||
915 | /* newly allocated page frames below buffer header or ...*/ | |
916 | if (bh->b_data == b_data + b_allocd) { | |
917 | bh->b_size += b_allocd; | |
918 | bh->b_data -= b_allocd; | |
1da177e4 | 919 | if (full) |
41aa1706 | 920 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
921 | continue; |
922 | } | |
41aa1706 | 923 | /* they are above the header */ |
1da177e4 | 924 | if (b_data == bh->b_data + bh->b_size) { |
41aa1706 | 925 | bh->b_size += b_allocd; |
1da177e4 | 926 | if (full) |
41aa1706 | 927 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
928 | continue; |
929 | } | |
930 | prev_bh = bh; | |
5a04cfa9 BP |
931 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
932 | if (!bh) { | |
41aa1706 | 933 | free_pages((unsigned long) b_data, order); |
1da177e4 LT |
934 | goto abort; |
935 | } | |
936 | bh->b_reqnext = NULL; | |
937 | bh->b_data = b_data; | |
41aa1706 | 938 | bh->b_size = b_allocd; |
1da177e4 LT |
939 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
940 | prev_bh->b_reqnext = bh; | |
41aa1706 BP |
941 | |
942 | pages &= (order-1); | |
1da177e4 | 943 | } |
41aa1706 | 944 | |
1da177e4 LT |
945 | bh->b_size -= tape->excess_bh_size; |
946 | if (full) | |
947 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
077e3bdb | 948 | return merge_bh; |
1da177e4 | 949 | abort: |
077e3bdb | 950 | ide_tape_kfree_buffer(tape); |
1da177e4 LT |
951 | return NULL; |
952 | } | |
953 | ||
5a04cfa9 | 954 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
8646c88f | 955 | const char __user *buf, int n) |
1da177e4 LT |
956 | { |
957 | struct idetape_bh *bh = tape->bh; | |
958 | int count; | |
dcd96379 | 959 | int ret = 0; |
1da177e4 LT |
960 | |
961 | while (n) { | |
1da177e4 | 962 | if (bh == NULL) { |
5a04cfa9 BP |
963 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
964 | __func__); | |
dcd96379 | 965 | return 1; |
1da177e4 | 966 | } |
5a04cfa9 BP |
967 | count = min((unsigned int) |
968 | (bh->b_size - atomic_read(&bh->b_count)), | |
969 | (unsigned int)n); | |
970 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
971 | count)) | |
dcd96379 | 972 | ret = 1; |
1da177e4 LT |
973 | n -= count; |
974 | atomic_add(count, &bh->b_count); | |
975 | buf += count; | |
976 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
977 | bh = bh->b_reqnext; | |
978 | if (bh) | |
979 | atomic_set(&bh->b_count, 0); | |
980 | } | |
981 | } | |
982 | tape->bh = bh; | |
dcd96379 | 983 | return ret; |
1da177e4 LT |
984 | } |
985 | ||
5a04cfa9 | 986 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
99d74e61 | 987 | int n) |
1da177e4 LT |
988 | { |
989 | struct idetape_bh *bh = tape->bh; | |
990 | int count; | |
dcd96379 | 991 | int ret = 0; |
1da177e4 LT |
992 | |
993 | while (n) { | |
1da177e4 | 994 | if (bh == NULL) { |
5a04cfa9 BP |
995 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
996 | __func__); | |
dcd96379 | 997 | return 1; |
1da177e4 | 998 | } |
1da177e4 | 999 | count = min(tape->b_count, n); |
dcd96379 DW |
1000 | if (copy_to_user(buf, tape->b_data, count)) |
1001 | ret = 1; | |
1da177e4 LT |
1002 | n -= count; |
1003 | tape->b_data += count; | |
1004 | tape->b_count -= count; | |
1005 | buf += count; | |
1006 | if (!tape->b_count) { | |
5a04cfa9 BP |
1007 | bh = bh->b_reqnext; |
1008 | tape->bh = bh; | |
1da177e4 LT |
1009 | if (bh) { |
1010 | tape->b_data = bh->b_data; | |
1011 | tape->b_count = atomic_read(&bh->b_count); | |
1012 | } | |
1013 | } | |
1014 | } | |
dcd96379 | 1015 | return ret; |
1da177e4 LT |
1016 | } |
1017 | ||
077e3bdb | 1018 | static void idetape_init_merge_buffer(idetape_tape_t *tape) |
1da177e4 | 1019 | { |
077e3bdb BP |
1020 | struct idetape_bh *bh = tape->merge_bh; |
1021 | tape->bh = tape->merge_bh; | |
5a04cfa9 | 1022 | |
54abf37e | 1023 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 LT |
1024 | atomic_set(&bh->b_count, 0); |
1025 | else { | |
1026 | tape->b_data = bh->b_data; | |
1027 | tape->b_count = atomic_read(&bh->b_count); | |
1028 | } | |
1029 | } | |
1030 | ||
1da177e4 | 1031 | /* |
3c98bf34 BP |
1032 | * Write a filemark if write_filemark=1. Flush the device buffers without |
1033 | * writing a filemark otherwise. | |
1da177e4 | 1034 | */ |
5a04cfa9 | 1035 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 1036 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 | 1037 | { |
7bf7420a | 1038 | ide_init_pc(pc); |
90699ce2 | 1039 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 1040 | pc->c[4] = write_filemark; |
346331f8 | 1041 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1042 | } |
1043 | ||
1da177e4 LT |
1044 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
1045 | { | |
1046 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1047 | struct gendisk *disk = tape->disk; |
1da177e4 LT |
1048 | int load_attempted = 0; |
1049 | ||
3c98bf34 | 1050 | /* Wait for the tape to become ready */ |
f2e3ab52 | 1051 | set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
1da177e4 LT |
1052 | timeout += jiffies; |
1053 | while (time_before(jiffies, timeout)) { | |
de699ad5 | 1054 | if (ide_do_test_unit_ready(drive, disk) == 0) |
1da177e4 LT |
1055 | return 0; |
1056 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
1057 | || (tape->asc == 0x3A)) { |
1058 | /* no media */ | |
1da177e4 LT |
1059 | if (load_attempted) |
1060 | return -ENOMEDIUM; | |
0c8a6c7a | 1061 | ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
1da177e4 LT |
1062 | load_attempted = 1; |
1063 | /* not about to be ready */ | |
1064 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1065 | (tape->ascq == 1 || tape->ascq == 8))) | |
1066 | return -EIO; | |
80ce45fd | 1067 | msleep(100); |
1da177e4 LT |
1068 | } |
1069 | return -EIO; | |
1070 | } | |
1071 | ||
5a04cfa9 | 1072 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 1073 | { |
2ac07d92 | 1074 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1075 | struct ide_atapi_pc pc; |
1da177e4 LT |
1076 | int rc; |
1077 | ||
1078 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
2ac07d92 | 1079 | rc = ide_queue_pc_tail(drive, tape->disk, &pc); |
5a04cfa9 | 1080 | if (rc) |
1da177e4 LT |
1081 | return rc; |
1082 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1083 | return 0; | |
1084 | } | |
1085 | ||
d236d74c | 1086 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1087 | { |
7bf7420a | 1088 | ide_init_pc(pc); |
90699ce2 | 1089 | pc->c[0] = READ_POSITION; |
d236d74c | 1090 | pc->req_xfer = 20; |
1da177e4 LT |
1091 | } |
1092 | ||
5a04cfa9 | 1093 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
1094 | { |
1095 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1096 | struct ide_atapi_pc pc; |
1da177e4 LT |
1097 | int position; |
1098 | ||
8004a8c9 | 1099 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
1100 | |
1101 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1102 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) |
1da177e4 | 1103 | return -1; |
54bb2074 | 1104 | position = tape->first_frame; |
1da177e4 LT |
1105 | return position; |
1106 | } | |
1107 | ||
d236d74c BP |
1108 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
1109 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1110 | unsigned int block, u8 partition, int skip) |
1da177e4 | 1111 | { |
7bf7420a | 1112 | ide_init_pc(pc); |
90699ce2 | 1113 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 1114 | pc->c[1] = 2; |
860ff5ec | 1115 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 1116 | pc->c[8] = partition; |
346331f8 | 1117 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1118 | } |
1119 | ||
ec0fdb01 | 1120 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1121 | { |
1122 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1123 | |
54abf37e | 1124 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 1125 | return; |
1da177e4 | 1126 | |
f2e3ab52 | 1127 | clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); |
01a63aeb | 1128 | tape->merge_bh_size = 0; |
077e3bdb BP |
1129 | if (tape->merge_bh != NULL) { |
1130 | ide_tape_kfree_buffer(tape); | |
1131 | tape->merge_bh = NULL; | |
1da177e4 LT |
1132 | } |
1133 | ||
54abf37e | 1134 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1135 | } |
1136 | ||
1137 | /* | |
3c98bf34 BP |
1138 | * Position the tape to the requested block using the LOCATE packet command. |
1139 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1140 | * all higher level operations, we queue the commands at the tail of the request | |
1141 | * queue and wait for their completion. | |
1da177e4 | 1142 | */ |
5a04cfa9 BP |
1143 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
1144 | u8 partition, int skip) | |
1da177e4 LT |
1145 | { |
1146 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1147 | struct gendisk *disk = tape->disk; |
1da177e4 | 1148 | int retval; |
d236d74c | 1149 | struct ide_atapi_pc pc; |
1da177e4 | 1150 | |
54abf37e | 1151 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 1152 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1153 | idetape_wait_ready(drive, 60 * 5 * HZ); |
1154 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
2ac07d92 | 1155 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1156 | if (retval) |
1157 | return (retval); | |
1158 | ||
1159 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1160 | return ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1161 | } |
1162 | ||
ec0fdb01 | 1163 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 1164 | int restore_position) |
1da177e4 LT |
1165 | { |
1166 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1167 | int seek, position; |
1168 | ||
ec0fdb01 | 1169 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1170 | if (restore_position) { |
1171 | position = idetape_read_position(drive); | |
9798630a | 1172 | seek = position > 0 ? position : 0; |
1da177e4 | 1173 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 1174 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 1175 | " %s\n", tape->name, __func__); |
1da177e4 LT |
1176 | return; |
1177 | } | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | /* | |
3c98bf34 BP |
1182 | * Generate a read/write request for the block device interface and wait for it |
1183 | * to be serviced. | |
1da177e4 | 1184 | */ |
5a04cfa9 BP |
1185 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
1186 | struct idetape_bh *bh) | |
1da177e4 LT |
1187 | { |
1188 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a FT |
1189 | struct request *rq; |
1190 | int ret, errors; | |
1da177e4 | 1191 | |
8004a8c9 BP |
1192 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
1193 | ||
64ea1b4a FT |
1194 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1195 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1196 | rq->cmd[13] = cmd; |
64ea1b4a FT |
1197 | rq->rq_disk = tape->disk; |
1198 | rq->special = (void *)bh; | |
1199 | rq->sector = tape->first_frame; | |
1200 | rq->nr_sectors = blocks; | |
1201 | rq->current_nr_sectors = blocks; | |
1202 | blk_execute_rq(drive->queue, tape->disk, rq, 0); | |
1203 | ||
1204 | errors = rq->errors; | |
1205 | ret = tape->blk_size * (blocks - rq->current_nr_sectors); | |
1206 | blk_put_request(rq); | |
1da177e4 LT |
1207 | |
1208 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1209 | return 0; | |
1210 | ||
077e3bdb BP |
1211 | if (tape->merge_bh) |
1212 | idetape_init_merge_buffer(tape); | |
64ea1b4a | 1213 | if (errors == IDETAPE_ERROR_GENERAL) |
1da177e4 | 1214 | return -EIO; |
64ea1b4a | 1215 | return ret; |
1da177e4 LT |
1216 | } |
1217 | ||
d236d74c | 1218 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1219 | { |
7bf7420a | 1220 | ide_init_pc(pc); |
90699ce2 | 1221 | pc->c[0] = INQUIRY; |
5a04cfa9 | 1222 | pc->c[4] = 254; |
d236d74c | 1223 | pc->req_xfer = 254; |
1da177e4 LT |
1224 | } |
1225 | ||
d236d74c BP |
1226 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
1227 | struct ide_atapi_pc *pc) | |
1da177e4 | 1228 | { |
7bf7420a | 1229 | ide_init_pc(pc); |
90699ce2 | 1230 | pc->c[0] = REZERO_UNIT; |
346331f8 | 1231 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1232 | } |
1233 | ||
d236d74c | 1234 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1235 | { |
7bf7420a | 1236 | ide_init_pc(pc); |
90699ce2 | 1237 | pc->c[0] = ERASE; |
1da177e4 | 1238 | pc->c[1] = 1; |
346331f8 | 1239 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1240 | } |
1241 | ||
d236d74c | 1242 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 | 1243 | { |
7bf7420a | 1244 | ide_init_pc(pc); |
90699ce2 | 1245 | pc->c[0] = SPACE; |
860ff5ec | 1246 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 1247 | pc->c[1] = cmd; |
346331f8 | 1248 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1249 | } |
1250 | ||
97c566ce | 1251 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 1252 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1253 | { |
1254 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1255 | |
8004a8c9 | 1256 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 1257 | |
0aa4b01e | 1258 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
077e3bdb | 1259 | blocks, tape->merge_bh); |
1da177e4 LT |
1260 | } |
1261 | ||
d9df937a | 1262 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1263 | { |
1264 | idetape_tape_t *tape = drive->driver_data; | |
1265 | int blocks, min; | |
1266 | struct idetape_bh *bh; | |
55a5d291 | 1267 | |
54abf37e | 1268 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 1269 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 1270 | " but we are not writing.\n"); |
1da177e4 LT |
1271 | return; |
1272 | } | |
01a63aeb | 1273 | if (tape->merge_bh_size > tape->buffer_size) { |
1da177e4 | 1274 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
01a63aeb | 1275 | tape->merge_bh_size = tape->buffer_size; |
1da177e4 | 1276 | } |
01a63aeb BP |
1277 | if (tape->merge_bh_size) { |
1278 | blocks = tape->merge_bh_size / tape->blk_size; | |
1279 | if (tape->merge_bh_size % tape->blk_size) { | |
1da177e4 LT |
1280 | unsigned int i; |
1281 | ||
1282 | blocks++; | |
01a63aeb | 1283 | i = tape->blk_size - tape->merge_bh_size % |
54bb2074 | 1284 | tape->blk_size; |
1da177e4 LT |
1285 | bh = tape->bh->b_reqnext; |
1286 | while (bh) { | |
1287 | atomic_set(&bh->b_count, 0); | |
1288 | bh = bh->b_reqnext; | |
1289 | } | |
1290 | bh = tape->bh; | |
1291 | while (i) { | |
1292 | if (bh == NULL) { | |
5a04cfa9 BP |
1293 | printk(KERN_INFO "ide-tape: bug," |
1294 | " bh NULL\n"); | |
1da177e4 LT |
1295 | break; |
1296 | } | |
5a04cfa9 BP |
1297 | min = min(i, (unsigned int)(bh->b_size - |
1298 | atomic_read(&bh->b_count))); | |
1299 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1300 | 0, min); | |
1da177e4 LT |
1301 | atomic_add(min, &bh->b_count); |
1302 | i -= min; | |
1303 | bh = bh->b_reqnext; | |
1304 | } | |
1305 | } | |
1306 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
01a63aeb | 1307 | tape->merge_bh_size = 0; |
1da177e4 | 1308 | } |
077e3bdb BP |
1309 | if (tape->merge_bh != NULL) { |
1310 | ide_tape_kfree_buffer(tape); | |
1311 | tape->merge_bh = NULL; | |
1da177e4 | 1312 | } |
54abf37e | 1313 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1314 | } |
1315 | ||
83042b24 | 1316 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
1317 | { |
1318 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1319 | int bytes_read; |
1da177e4 LT |
1320 | |
1321 | /* Initialize read operation */ | |
54abf37e BP |
1322 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1323 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
d9df937a | 1324 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1325 | idetape_flush_tape_buffers(drive); |
1326 | } | |
077e3bdb | 1327 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1328 | printk(KERN_ERR "ide-tape: merge_bh_size should be" |
5a04cfa9 | 1329 | " 0 now\n"); |
01a63aeb | 1330 | tape->merge_bh_size = 0; |
1da177e4 | 1331 | } |
077e3bdb BP |
1332 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1333 | if (!tape->merge_bh) | |
1da177e4 | 1334 | return -ENOMEM; |
54abf37e | 1335 | tape->chrdev_dir = IDETAPE_DIR_READ; |
1da177e4 LT |
1336 | |
1337 | /* | |
3c98bf34 BP |
1338 | * Issue a read 0 command to ensure that DSC handshake is |
1339 | * switched from completion mode to buffer available mode. | |
1340 | * No point in issuing this if DSC overlap isn't supported, some | |
1341 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 | 1342 | */ |
97100fc8 | 1343 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { |
5a04cfa9 BP |
1344 | bytes_read = idetape_queue_rw_tail(drive, |
1345 | REQ_IDETAPE_READ, 0, | |
077e3bdb | 1346 | tape->merge_bh); |
1da177e4 | 1347 | if (bytes_read < 0) { |
077e3bdb BP |
1348 | ide_tape_kfree_buffer(tape); |
1349 | tape->merge_bh = NULL; | |
54abf37e | 1350 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1351 | return bytes_read; |
1352 | } | |
1353 | } | |
1354 | } | |
5e69bd95 | 1355 | |
1da177e4 LT |
1356 | return 0; |
1357 | } | |
1358 | ||
5bd50dc6 | 1359 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1360 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1361 | { |
1362 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1363 | |
8004a8c9 | 1364 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1365 | |
3c98bf34 | 1366 | /* If we are at a filemark, return a read length of 0 */ |
f2e3ab52 | 1367 | if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 LT |
1368 | return 0; |
1369 | ||
83042b24 | 1370 | idetape_init_read(drive); |
5e69bd95 | 1371 | |
5e69bd95 | 1372 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
077e3bdb | 1373 | tape->merge_bh); |
1da177e4 LT |
1374 | } |
1375 | ||
5a04cfa9 | 1376 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1377 | { |
1378 | idetape_tape_t *tape = drive->driver_data; | |
1379 | struct idetape_bh *bh; | |
1380 | int blocks; | |
3c98bf34 | 1381 | |
1da177e4 LT |
1382 | while (bcount) { |
1383 | unsigned int count; | |
1384 | ||
077e3bdb | 1385 | bh = tape->merge_bh; |
f73850a3 | 1386 | count = min(tape->buffer_size, bcount); |
1da177e4 | 1387 | bcount -= count; |
54bb2074 | 1388 | blocks = count / tape->blk_size; |
1da177e4 | 1389 | while (count) { |
5a04cfa9 BP |
1390 | atomic_set(&bh->b_count, |
1391 | min(count, (unsigned int)bh->b_size)); | |
1da177e4 LT |
1392 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
1393 | count -= atomic_read(&bh->b_count); | |
1394 | bh = bh->b_reqnext; | |
1395 | } | |
5a04cfa9 | 1396 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
077e3bdb | 1397 | tape->merge_bh); |
1da177e4 LT |
1398 | } |
1399 | } | |
1400 | ||
1da177e4 | 1401 | /* |
3c98bf34 BP |
1402 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1403 | * currently support only one partition. | |
1404 | */ | |
5a04cfa9 | 1405 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 | 1406 | { |
2ac07d92 BZ |
1407 | struct ide_tape_obj *tape = drive->driver_data; |
1408 | struct gendisk *disk = tape->disk; | |
1da177e4 | 1409 | int retval; |
d236d74c | 1410 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1411 | |
1412 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1413 | ||
1da177e4 | 1414 | idetape_create_rewind_cmd(drive, &pc); |
2ac07d92 | 1415 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1416 | if (retval) |
1417 | return retval; | |
1418 | ||
1419 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1420 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1421 | if (retval) |
1422 | return retval; | |
1423 | return 0; | |
1424 | } | |
1425 | ||
3c98bf34 | 1426 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1427 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1428 | unsigned long arg) | |
1da177e4 LT |
1429 | { |
1430 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1431 | void __user *argp = (void __user *)arg; |
1432 | ||
d59823fa BP |
1433 | struct idetape_config { |
1434 | int dsc_rw_frequency; | |
1435 | int dsc_media_access_frequency; | |
1436 | int nr_stages; | |
1437 | } config; | |
1438 | ||
8004a8c9 BP |
1439 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1440 | ||
1da177e4 | 1441 | switch (cmd) { |
5a04cfa9 BP |
1442 | case 0x0340: |
1443 | if (copy_from_user(&config, argp, sizeof(config))) | |
1444 | return -EFAULT; | |
1445 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1446 | break; |
1447 | case 0x0350: | |
1448 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1449 | config.nr_stages = 1; |
5a04cfa9 BP |
1450 | if (copy_to_user(argp, &config, sizeof(config))) |
1451 | return -EFAULT; | |
1452 | break; | |
1453 | default: | |
1454 | return -EIO; | |
1da177e4 LT |
1455 | } |
1456 | return 0; | |
1457 | } | |
1458 | ||
5a04cfa9 BP |
1459 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1460 | int mt_count) | |
1da177e4 LT |
1461 | { |
1462 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1463 | struct gendisk *disk = tape->disk; |
d236d74c | 1464 | struct ide_atapi_pc pc; |
5a04cfa9 | 1465 | int retval, count = 0; |
b6422013 | 1466 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1467 | |
1468 | if (mt_count == 0) | |
1469 | return 0; | |
1470 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1471 | if (!sprev) |
1da177e4 | 1472 | return -EIO; |
5a04cfa9 | 1473 | mt_count = -mt_count; |
1da177e4 LT |
1474 | } |
1475 | ||
54abf37e | 1476 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
01a63aeb | 1477 | tape->merge_bh_size = 0; |
f2e3ab52 | 1478 | if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 | 1479 | ++count; |
ec0fdb01 | 1480 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1481 | } |
1482 | ||
1da177e4 | 1483 | switch (mt_op) { |
5a04cfa9 BP |
1484 | case MTFSF: |
1485 | case MTBSF: | |
1486 | idetape_create_space_cmd(&pc, mt_count - count, | |
1487 | IDETAPE_SPACE_OVER_FILEMARK); | |
2ac07d92 | 1488 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1489 | case MTFSFM: |
1490 | case MTBSFM: | |
1491 | if (!sprev) | |
1492 | return -EIO; | |
1493 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1494 | mt_count - count); | |
1495 | if (retval) | |
1496 | return retval; | |
1497 | count = (MTBSFM == mt_op ? 1 : -1); | |
1498 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1499 | default: | |
1500 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1501 | mt_op); | |
1502 | return -EIO; | |
1da177e4 LT |
1503 | } |
1504 | } | |
1505 | ||
1da177e4 | 1506 | /* |
3c98bf34 | 1507 | * Our character device read / write functions. |
1da177e4 | 1508 | * |
3c98bf34 BP |
1509 | * The tape is optimized to maximize throughput when it is transferring an |
1510 | * integral number of the "continuous transfer limit", which is a parameter of | |
1511 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1512 | * |
3c98bf34 BP |
1513 | * As of version 1.3 of the driver, the character device provides an abstract |
1514 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1515 | * same backup/restore procedure is supported. The driver will internally | |
1516 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1517 | * between the user's block size to the recommended size will only result in a | |
1518 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1519 | * This is not applicable to Onstream. | |
1da177e4 | 1520 | */ |
5a04cfa9 BP |
1521 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1522 | size_t count, loff_t *ppos) | |
1da177e4 | 1523 | { |
5aeddf90 | 1524 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1525 | ide_drive_t *drive = tape->drive; |
5a04cfa9 | 1526 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 1527 | ssize_t ret = 0; |
b6422013 | 1528 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 1529 | |
8004a8c9 | 1530 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1531 | |
54abf37e | 1532 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
f2e3ab52 | 1533 | if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) |
54bb2074 BP |
1534 | if (count > tape->blk_size && |
1535 | (count % tape->blk_size) == 0) | |
1536 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1537 | } |
83042b24 | 1538 | rc = idetape_init_read(drive); |
8d06bfad | 1539 | if (rc < 0) |
1da177e4 LT |
1540 | return rc; |
1541 | if (count == 0) | |
1542 | return (0); | |
01a63aeb BP |
1543 | if (tape->merge_bh_size) { |
1544 | actually_read = min((unsigned int)(tape->merge_bh_size), | |
5a04cfa9 | 1545 | (unsigned int)count); |
99d74e61 | 1546 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
dcd96379 | 1547 | ret = -EFAULT; |
1da177e4 | 1548 | buf += actually_read; |
01a63aeb | 1549 | tape->merge_bh_size -= actually_read; |
1da177e4 LT |
1550 | count -= actually_read; |
1551 | } | |
f73850a3 | 1552 | while (count >= tape->buffer_size) { |
b6422013 | 1553 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1554 | if (bytes_read <= 0) |
1555 | goto finish; | |
99d74e61 | 1556 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
dcd96379 | 1557 | ret = -EFAULT; |
1da177e4 LT |
1558 | buf += bytes_read; |
1559 | count -= bytes_read; | |
1560 | actually_read += bytes_read; | |
1561 | } | |
1562 | if (count) { | |
b6422013 | 1563 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1564 | if (bytes_read <= 0) |
1565 | goto finish; | |
1566 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
99d74e61 | 1567 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
dcd96379 | 1568 | ret = -EFAULT; |
1da177e4 | 1569 | actually_read += temp; |
01a63aeb | 1570 | tape->merge_bh_size = bytes_read-temp; |
1da177e4 LT |
1571 | } |
1572 | finish: | |
f2e3ab52 | 1573 | if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { |
8004a8c9 BP |
1574 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1575 | ||
1da177e4 LT |
1576 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1577 | return 0; | |
1578 | } | |
dcd96379 | 1579 | |
5a04cfa9 | 1580 | return ret ? ret : actually_read; |
1da177e4 LT |
1581 | } |
1582 | ||
5a04cfa9 | 1583 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1584 | size_t count, loff_t *ppos) |
1585 | { | |
5aeddf90 | 1586 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1587 | ide_drive_t *drive = tape->drive; |
dcd96379 DW |
1588 | ssize_t actually_written = 0; |
1589 | ssize_t ret = 0; | |
b6422013 | 1590 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
1591 | |
1592 | /* The drive is write protected. */ | |
1593 | if (tape->write_prot) | |
1594 | return -EACCES; | |
1595 | ||
8004a8c9 | 1596 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1597 | |
1598 | /* Initialize write operation */ | |
54abf37e BP |
1599 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
1600 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1601 | ide_tape_discard_merge_buffer(drive, 1); |
077e3bdb | 1602 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1603 | printk(KERN_ERR "ide-tape: merge_bh_size " |
1da177e4 | 1604 | "should be 0 now\n"); |
01a63aeb | 1605 | tape->merge_bh_size = 0; |
1da177e4 | 1606 | } |
077e3bdb BP |
1607 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1608 | if (!tape->merge_bh) | |
1da177e4 | 1609 | return -ENOMEM; |
54abf37e | 1610 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
077e3bdb | 1611 | idetape_init_merge_buffer(tape); |
1da177e4 LT |
1612 | |
1613 | /* | |
3c98bf34 BP |
1614 | * Issue a write 0 command to ensure that DSC handshake is |
1615 | * switched from completion mode to buffer available mode. No | |
1616 | * point in issuing this if DSC overlap isn't supported, some | |
1617 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 | 1618 | */ |
97100fc8 | 1619 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { |
5a04cfa9 BP |
1620 | ssize_t retval = idetape_queue_rw_tail(drive, |
1621 | REQ_IDETAPE_WRITE, 0, | |
077e3bdb | 1622 | tape->merge_bh); |
1da177e4 | 1623 | if (retval < 0) { |
077e3bdb BP |
1624 | ide_tape_kfree_buffer(tape); |
1625 | tape->merge_bh = NULL; | |
54abf37e | 1626 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1627 | return retval; |
1628 | } | |
1629 | } | |
1630 | } | |
1631 | if (count == 0) | |
1632 | return (0); | |
01a63aeb BP |
1633 | if (tape->merge_bh_size) { |
1634 | if (tape->merge_bh_size >= tape->buffer_size) { | |
5a04cfa9 | 1635 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
01a63aeb | 1636 | tape->merge_bh_size = 0; |
1da177e4 | 1637 | } |
5a04cfa9 | 1638 | actually_written = min((unsigned int) |
01a63aeb | 1639 | (tape->buffer_size - tape->merge_bh_size), |
5a04cfa9 | 1640 | (unsigned int)count); |
8646c88f | 1641 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
dcd96379 | 1642 | ret = -EFAULT; |
1da177e4 | 1643 | buf += actually_written; |
01a63aeb | 1644 | tape->merge_bh_size += actually_written; |
1da177e4 LT |
1645 | count -= actually_written; |
1646 | ||
01a63aeb | 1647 | if (tape->merge_bh_size == tape->buffer_size) { |
dcd96379 | 1648 | ssize_t retval; |
01a63aeb | 1649 | tape->merge_bh_size = 0; |
b6422013 | 1650 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
1651 | if (retval <= 0) |
1652 | return (retval); | |
1653 | } | |
1654 | } | |
f73850a3 | 1655 | while (count >= tape->buffer_size) { |
dcd96379 | 1656 | ssize_t retval; |
f73850a3 | 1657 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
dcd96379 | 1658 | ret = -EFAULT; |
f73850a3 BP |
1659 | buf += tape->buffer_size; |
1660 | count -= tape->buffer_size; | |
b6422013 | 1661 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 1662 | actually_written += tape->buffer_size; |
1da177e4 LT |
1663 | if (retval <= 0) |
1664 | return (retval); | |
1665 | } | |
1666 | if (count) { | |
1667 | actually_written += count; | |
8646c88f | 1668 | if (idetape_copy_stage_from_user(tape, buf, count)) |
dcd96379 | 1669 | ret = -EFAULT; |
01a63aeb | 1670 | tape->merge_bh_size += count; |
1da177e4 | 1671 | } |
5a04cfa9 | 1672 | return ret ? ret : actually_written; |
1da177e4 LT |
1673 | } |
1674 | ||
5a04cfa9 | 1675 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1676 | { |
2ac07d92 | 1677 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1678 | struct ide_atapi_pc pc; |
1da177e4 LT |
1679 | |
1680 | /* Write a filemark */ | |
1681 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
2ac07d92 | 1682 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
1da177e4 LT |
1683 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
1684 | return -EIO; | |
1685 | } | |
1686 | return 0; | |
1687 | } | |
1688 | ||
1689 | /* | |
d99c9da2 BP |
1690 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1691 | * requested. | |
1da177e4 | 1692 | * |
d99c9da2 BP |
1693 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1694 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1695 | * usually not supported. |
1da177e4 | 1696 | * |
d99c9da2 | 1697 | * The following commands are currently not supported: |
1da177e4 | 1698 | * |
d99c9da2 BP |
1699 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1700 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1701 | */ |
d99c9da2 | 1702 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1703 | { |
1704 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1705 | struct gendisk *disk = tape->disk; |
d236d74c | 1706 | struct ide_atapi_pc pc; |
5a04cfa9 | 1707 | int i, retval; |
1da177e4 | 1708 | |
8004a8c9 BP |
1709 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
1710 | mt_op, mt_count); | |
5a04cfa9 | 1711 | |
1da177e4 | 1712 | switch (mt_op) { |
5a04cfa9 BP |
1713 | case MTFSF: |
1714 | case MTFSFM: | |
1715 | case MTBSF: | |
1716 | case MTBSFM: | |
1717 | if (!mt_count) | |
1718 | return 0; | |
1719 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1720 | default: | |
1721 | break; | |
1da177e4 | 1722 | } |
5a04cfa9 | 1723 | |
1da177e4 | 1724 | switch (mt_op) { |
5a04cfa9 BP |
1725 | case MTWEOF: |
1726 | if (tape->write_prot) | |
1727 | return -EACCES; | |
ec0fdb01 | 1728 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1729 | for (i = 0; i < mt_count; i++) { |
1730 | retval = idetape_write_filemark(drive); | |
1731 | if (retval) | |
1732 | return retval; | |
1733 | } | |
1734 | return 0; | |
1735 | case MTREW: | |
ec0fdb01 | 1736 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1737 | if (idetape_rewind_tape(drive)) |
1738 | return -EIO; | |
1739 | return 0; | |
1740 | case MTLOAD: | |
ec0fdb01 | 1741 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1742 | return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1743 | case MTUNLOAD: |
1744 | case MTOFFL: | |
1745 | /* | |
1746 | * If door is locked, attempt to unlock before | |
1747 | * attempting to eject. | |
1748 | */ | |
1749 | if (tape->door_locked) { | |
0578042d | 1750 | if (!ide_set_media_lock(drive, disk, 0)) |
385a4b87 | 1751 | tape->door_locked = DOOR_UNLOCKED; |
5a04cfa9 | 1752 | } |
ec0fdb01 | 1753 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1754 | retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); |
5a04cfa9 | 1755 | if (!retval) |
f2e3ab52 | 1756 | clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
5a04cfa9 BP |
1757 | return retval; |
1758 | case MTNOP: | |
ec0fdb01 | 1759 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1760 | return idetape_flush_tape_buffers(drive); |
1761 | case MTRETEN: | |
ec0fdb01 | 1762 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1763 | return ide_do_start_stop(drive, disk, |
5a04cfa9 | 1764 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1765 | case MTEOM: |
1766 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
2ac07d92 | 1767 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1768 | case MTERASE: |
1769 | (void)idetape_rewind_tape(drive); | |
1770 | idetape_create_erase_cmd(&pc); | |
2ac07d92 | 1771 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1772 | case MTSETBLK: |
1773 | if (mt_count) { | |
1774 | if (mt_count < tape->blk_size || | |
1775 | mt_count % tape->blk_size) | |
1da177e4 | 1776 | return -EIO; |
5a04cfa9 | 1777 | tape->user_bs_factor = mt_count / tape->blk_size; |
f2e3ab52 | 1778 | clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 | 1779 | } else |
f2e3ab52 | 1780 | set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 BP |
1781 | return 0; |
1782 | case MTSEEK: | |
ec0fdb01 | 1783 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1784 | return idetape_position_tape(drive, |
1785 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1786 | case MTSETPART: | |
ec0fdb01 | 1787 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1788 | return idetape_position_tape(drive, 0, mt_count, 0); |
1789 | case MTFSR: | |
1790 | case MTBSR: | |
1791 | case MTLOCK: | |
0578042d | 1792 | retval = ide_set_media_lock(drive, disk, 1); |
5a04cfa9 | 1793 | if (retval) |
1da177e4 | 1794 | return retval; |
5a04cfa9 BP |
1795 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1796 | return 0; | |
1797 | case MTUNLOCK: | |
0578042d | 1798 | retval = ide_set_media_lock(drive, disk, 0); |
5a04cfa9 BP |
1799 | if (retval) |
1800 | return retval; | |
1801 | tape->door_locked = DOOR_UNLOCKED; | |
1802 | return 0; | |
1803 | default: | |
1804 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1805 | mt_op); | |
1806 | return -EIO; | |
1da177e4 LT |
1807 | } |
1808 | } | |
1809 | ||
1810 | /* | |
d99c9da2 BP |
1811 | * Our character device ioctls. General mtio.h magnetic io commands are |
1812 | * supported here, and not in the corresponding block interface. Our own | |
1813 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 1814 | */ |
d99c9da2 BP |
1815 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
1816 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1817 | { |
5aeddf90 | 1818 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 LT |
1819 | ide_drive_t *drive = tape->drive; |
1820 | struct mtop mtop; | |
1821 | struct mtget mtget; | |
1822 | struct mtpos mtpos; | |
54bb2074 | 1823 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
1824 | void __user *argp = (void __user *)arg; |
1825 | ||
8004a8c9 | 1826 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 1827 | |
54abf37e | 1828 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 1829 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1830 | idetape_flush_tape_buffers(drive); |
1831 | } | |
1832 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
01a63aeb | 1833 | block_offset = tape->merge_bh_size / |
54bb2074 | 1834 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
1835 | position = idetape_read_position(drive); |
1836 | if (position < 0) | |
1da177e4 LT |
1837 | return -EIO; |
1838 | } | |
1839 | switch (cmd) { | |
5a04cfa9 BP |
1840 | case MTIOCTOP: |
1841 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
1842 | return -EFAULT; | |
1843 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
1844 | case MTIOCGET: | |
1845 | memset(&mtget, 0, sizeof(struct mtget)); | |
1846 | mtget.mt_type = MT_ISSCSI2; | |
1847 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1848 | mtget.mt_dsreg = | |
1849 | ((tape->blk_size * tape->user_bs_factor) | |
1850 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
1851 | ||
1852 | if (tape->drv_write_prot) | |
1853 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
1854 | ||
1855 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
1856 | return -EFAULT; | |
1857 | return 0; | |
1858 | case MTIOCPOS: | |
1859 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1860 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
1861 | return -EFAULT; | |
1862 | return 0; | |
1863 | default: | |
1864 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1865 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 1866 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
1867 | } |
1868 | } | |
1869 | ||
3cffb9ce BP |
1870 | /* |
1871 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
1872 | * block size with the reported value. | |
1873 | */ | |
1874 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
1875 | { | |
1876 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1877 | struct ide_atapi_pc pc; |
3cffb9ce BP |
1878 | |
1879 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2ac07d92 | 1880 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
3cffb9ce | 1881 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
54bb2074 | 1882 | if (tape->blk_size == 0) { |
3cffb9ce BP |
1883 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
1884 | "block size, assuming 32k\n"); | |
54bb2074 | 1885 | tape->blk_size = 32768; |
3cffb9ce BP |
1886 | } |
1887 | return; | |
1888 | } | |
d236d74c BP |
1889 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
1890 | (pc.buf[4 + 6] << 8) + | |
1891 | pc.buf[4 + 7]; | |
1892 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 1893 | } |
1da177e4 | 1894 | |
5a04cfa9 | 1895 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
1896 | { |
1897 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
1898 | ide_drive_t *drive; | |
1899 | idetape_tape_t *tape; | |
1da177e4 LT |
1900 | int retval; |
1901 | ||
8004a8c9 BP |
1902 | if (i >= MAX_HWIFS * MAX_DRIVES) |
1903 | return -ENXIO; | |
1904 | ||
04f4ac9d | 1905 | lock_kernel(); |
8004a8c9 | 1906 | tape = ide_tape_chrdev_get(i); |
04f4ac9d JC |
1907 | if (!tape) { |
1908 | unlock_kernel(); | |
8004a8c9 | 1909 | return -ENXIO; |
04f4ac9d | 1910 | } |
8004a8c9 BP |
1911 | |
1912 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1913 | ||
1da177e4 LT |
1914 | /* |
1915 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1916 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1917 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1918 | */ | |
1919 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1920 | ||
1da177e4 LT |
1921 | drive = tape->drive; |
1922 | ||
1923 | filp->private_data = tape; | |
1924 | ||
f2e3ab52 | 1925 | if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { |
1da177e4 LT |
1926 | retval = -EBUSY; |
1927 | goto out_put_tape; | |
1928 | } | |
1929 | ||
1930 | retval = idetape_wait_ready(drive, 60 * HZ); | |
1931 | if (retval) { | |
f2e3ab52 | 1932 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1933 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
1934 | goto out_put_tape; | |
1935 | } | |
1936 | ||
1937 | idetape_read_position(drive); | |
f2e3ab52 | 1938 | if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) |
1da177e4 LT |
1939 | (void)idetape_rewind_tape(drive); |
1940 | ||
1da177e4 | 1941 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 1942 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
1943 | |
1944 | /* Set write protect flag if device is opened as read-only. */ | |
1945 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
1946 | tape->write_prot = 1; | |
1947 | else | |
1948 | tape->write_prot = tape->drv_write_prot; | |
1949 | ||
1950 | /* Make sure drive isn't write protected if user wants to write. */ | |
1951 | if (tape->write_prot) { | |
1952 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
1953 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
f2e3ab52 | 1954 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1955 | retval = -EROFS; |
1956 | goto out_put_tape; | |
1957 | } | |
1958 | } | |
1959 | ||
3c98bf34 | 1960 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 1961 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
0578042d | 1962 | if (!ide_set_media_lock(drive, tape->disk, 1)) { |
385a4b87 BZ |
1963 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
1964 | tape->door_locked = DOOR_LOCKED; | |
1da177e4 LT |
1965 | } |
1966 | } | |
04f4ac9d | 1967 | unlock_kernel(); |
1da177e4 LT |
1968 | return 0; |
1969 | ||
1970 | out_put_tape: | |
1971 | ide_tape_put(tape); | |
04f4ac9d | 1972 | unlock_kernel(); |
1da177e4 LT |
1973 | return retval; |
1974 | } | |
1975 | ||
5a04cfa9 | 1976 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
1977 | { |
1978 | idetape_tape_t *tape = drive->driver_data; | |
1979 | ||
d9df937a | 1980 | ide_tape_flush_merge_buffer(drive); |
077e3bdb BP |
1981 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); |
1982 | if (tape->merge_bh != NULL) { | |
54bb2074 BP |
1983 | idetape_pad_zeros(drive, tape->blk_size * |
1984 | (tape->user_bs_factor - 1)); | |
077e3bdb BP |
1985 | ide_tape_kfree_buffer(tape); |
1986 | tape->merge_bh = NULL; | |
1da177e4 LT |
1987 | } |
1988 | idetape_write_filemark(drive); | |
1989 | idetape_flush_tape_buffers(drive); | |
1990 | idetape_flush_tape_buffers(drive); | |
1991 | } | |
1992 | ||
5a04cfa9 | 1993 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 | 1994 | { |
5aeddf90 | 1995 | struct ide_tape_obj *tape = filp->private_data; |
1da177e4 | 1996 | ide_drive_t *drive = tape->drive; |
1da177e4 LT |
1997 | unsigned int minor = iminor(inode); |
1998 | ||
1999 | lock_kernel(); | |
2000 | tape = drive->driver_data; | |
8004a8c9 BP |
2001 | |
2002 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 2003 | |
54abf37e | 2004 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 2005 | idetape_write_release(drive, minor); |
54abf37e | 2006 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 2007 | if (minor < 128) |
ec0fdb01 | 2008 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 2009 | } |
f64eee7b | 2010 | |
f2e3ab52 | 2011 | if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) |
1da177e4 | 2012 | (void) idetape_rewind_tape(drive); |
54abf37e | 2013 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 | 2014 | if (tape->door_locked == DOOR_LOCKED) { |
0578042d | 2015 | if (!ide_set_media_lock(drive, tape->disk, 0)) |
385a4b87 | 2016 | tape->door_locked = DOOR_UNLOCKED; |
1da177e4 LT |
2017 | } |
2018 | } | |
f2e3ab52 | 2019 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2020 | ide_tape_put(tape); |
2021 | unlock_kernel(); | |
2022 | return 0; | |
2023 | } | |
2024 | ||
6d29c8f0 | 2025 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 2026 | { |
1da177e4 | 2027 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 2028 | struct ide_atapi_pc pc; |
801bd32e | 2029 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 2030 | |
1da177e4 | 2031 | idetape_create_inquiry_cmd(&pc); |
2ac07d92 | 2032 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
6d29c8f0 BP |
2033 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
2034 | tape->name); | |
1da177e4 LT |
2035 | return; |
2036 | } | |
d236d74c BP |
2037 | memcpy(vendor_id, &pc.buf[8], 8); |
2038 | memcpy(product_id, &pc.buf[16], 16); | |
2039 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 | 2040 | |
801bd32e BP |
2041 | ide_fixstring(vendor_id, 8, 0); |
2042 | ide_fixstring(product_id, 16, 0); | |
2043 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 2044 | |
801bd32e | 2045 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 2046 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
2047 | } |
2048 | ||
2049 | /* | |
b6422013 BP |
2050 | * Ask the tape about its various parameters. In particular, we will adjust our |
2051 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 2052 | */ |
5a04cfa9 | 2053 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
2054 | { |
2055 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2056 | struct ide_atapi_pc pc; |
b6422013 BP |
2057 | u8 *caps; |
2058 | u8 speed, max_speed; | |
47314fa4 | 2059 | |
1da177e4 | 2060 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2ac07d92 | 2061 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
b6422013 BP |
2062 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
2063 | " some default values\n"); | |
54bb2074 | 2064 | tape->blk_size = 512; |
b6422013 BP |
2065 | put_unaligned(52, (u16 *)&tape->caps[12]); |
2066 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2067 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
2068 | return; |
2069 | } | |
d236d74c | 2070 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
2071 | |
2072 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
2073 | speed = be16_to_cpup((__be16 *)&caps[14]); |
2074 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 2075 | |
cd740ab0 HH |
2076 | *(u16 *)&caps[8] = max_speed; |
2077 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
2078 | *(u16 *)&caps[14] = speed; | |
2079 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 2080 | |
b6422013 BP |
2081 | if (!speed) { |
2082 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2083 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2084 | *(u16 *)&caps[14] = 650; |
1da177e4 | 2085 | } |
b6422013 BP |
2086 | if (!max_speed) { |
2087 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2088 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2089 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
2090 | } |
2091 | ||
b6422013 | 2092 | memcpy(&tape->caps, caps, 20); |
0578042d BZ |
2093 | |
2094 | /* device lacks locking support according to capabilities page */ | |
2095 | if ((caps[6] & 1) == 0) | |
42619d35 | 2096 | drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; |
0578042d | 2097 | |
b6422013 | 2098 | if (caps[7] & 0x02) |
54bb2074 | 2099 | tape->blk_size = 512; |
b6422013 | 2100 | else if (caps[7] & 0x04) |
54bb2074 | 2101 | tape->blk_size = 1024; |
1da177e4 LT |
2102 | } |
2103 | ||
7662d046 | 2104 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
2105 | #define ide_tape_devset_get(name, field) \ |
2106 | static int get_##name(ide_drive_t *drive) \ | |
2107 | { \ | |
2108 | idetape_tape_t *tape = drive->driver_data; \ | |
2109 | return tape->field; \ | |
2110 | } | |
2111 | ||
2112 | #define ide_tape_devset_set(name, field) \ | |
2113 | static int set_##name(ide_drive_t *drive, int arg) \ | |
2114 | { \ | |
2115 | idetape_tape_t *tape = drive->driver_data; \ | |
2116 | tape->field = arg; \ | |
2117 | return 0; \ | |
2118 | } | |
2119 | ||
92f1f8fd | 2120 | #define ide_tape_devset_rw_field(_name, _field) \ |
8185d5aa BZ |
2121 | ide_tape_devset_get(_name, _field) \ |
2122 | ide_tape_devset_set(_name, _field) \ | |
92f1f8fd | 2123 | IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) |
8185d5aa | 2124 | |
92f1f8fd | 2125 | #define ide_tape_devset_r_field(_name, _field) \ |
8185d5aa | 2126 | ide_tape_devset_get(_name, _field) \ |
92f1f8fd | 2127 | IDE_DEVSET(_name, 0, get_##_name, NULL) |
8185d5aa BZ |
2128 | |
2129 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
2130 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
2131 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
2132 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
2133 | ||
97100fc8 | 2134 | ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); |
92f1f8fd EO |
2135 | |
2136 | ide_tape_devset_rw_field(debug_mask, debug_mask); | |
2137 | ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); | |
2138 | ||
2139 | ide_tape_devset_r_field(avg_speed, avg_speed); | |
2140 | ide_tape_devset_r_field(speed, caps[14]); | |
2141 | ide_tape_devset_r_field(buffer, caps[16]); | |
2142 | ide_tape_devset_r_field(buffer_size, buffer_size); | |
2143 | ||
2144 | static const struct ide_proc_devset idetape_settings[] = { | |
2145 | __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), | |
2146 | __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), | |
2147 | __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), | |
2148 | __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), | |
2149 | __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), | |
2150 | __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), | |
2151 | __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
2152 | mulf_tdsc, divf_tdsc), | |
71bfc7a7 | 2153 | { NULL }, |
8185d5aa | 2154 | }; |
7662d046 | 2155 | #endif |
1da177e4 LT |
2156 | |
2157 | /* | |
3c98bf34 | 2158 | * The function below is called to: |
1da177e4 | 2159 | * |
3c98bf34 BP |
2160 | * 1. Initialize our various state variables. |
2161 | * 2. Ask the tape for its capabilities. | |
2162 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2163 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 2164 | * |
3c98bf34 BP |
2165 | * Note that at this point ide.c already assigned us an irq, so that we can |
2166 | * queue requests here and wait for their completion. | |
1da177e4 | 2167 | */ |
5a04cfa9 | 2168 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 2169 | { |
83042b24 | 2170 | unsigned long t; |
1da177e4 | 2171 | int speed; |
f73850a3 | 2172 | int buffer_size; |
b6422013 | 2173 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 2174 | |
85e39035 BZ |
2175 | drive->pc_callback = ide_tape_callback; |
2176 | drive->pc_update_buffers = idetape_update_buffers; | |
2177 | drive->pc_io_buffers = ide_tape_io_buffers; | |
776bb027 | 2178 | |
97100fc8 BZ |
2179 | drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; |
2180 | ||
4166c199 BZ |
2181 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
2182 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2183 | tape->name); | |
97100fc8 | 2184 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 2185 | } |
97100fc8 | 2186 | |
1da177e4 | 2187 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 2188 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
97100fc8 BZ |
2189 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
2190 | ||
1da177e4 LT |
2191 | tape->minor = minor; |
2192 | tape->name[0] = 'h'; | |
2193 | tape->name[1] = 't'; | |
2194 | tape->name[2] = '0' + minor; | |
54abf37e | 2195 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
4dde4492 | 2196 | |
1da177e4 LT |
2197 | idetape_get_inquiry_results(drive); |
2198 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 2199 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 2200 | tape->user_bs_factor = 1; |
f73850a3 BP |
2201 | tape->buffer_size = *ctl * tape->blk_size; |
2202 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 2203 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 2204 | *ctl /= 2; |
f73850a3 | 2205 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 2206 | } |
f73850a3 | 2207 | buffer_size = tape->buffer_size; |
a997a435 | 2208 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
f73850a3 | 2209 | if (buffer_size % PAGE_SIZE) { |
a997a435 | 2210 | tape->pages_per_buffer++; |
f73850a3 | 2211 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
1da177e4 LT |
2212 | } |
2213 | ||
83042b24 | 2214 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 2215 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 2216 | |
f73850a3 | 2217 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
2218 | |
2219 | /* | |
3c98bf34 BP |
2220 | * Ensure that the number we got makes sense; limit it within |
2221 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 2222 | */ |
a792bd5a HH |
2223 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
2224 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 2225 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 2226 | "%lums tDSC%s\n", |
b6422013 | 2227 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
2228 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
2229 | tape->buffer_size / 1024, | |
54bb2074 | 2230 | tape->best_dsc_rw_freq * 1000 / HZ, |
97100fc8 | 2231 | (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); |
1da177e4 | 2232 | |
1e874f44 | 2233 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
2234 | } |
2235 | ||
4031bbe4 | 2236 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
2237 | { |
2238 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 2239 | |
7662d046 | 2240 | ide_proc_unregister_driver(drive, tape->driver); |
8fed4368 | 2241 | device_del(&tape->dev); |
1da177e4 LT |
2242 | ide_unregister_region(tape->disk); |
2243 | ||
8fed4368 BZ |
2244 | mutex_lock(&idetape_ref_mutex); |
2245 | put_device(&tape->dev); | |
2246 | mutex_unlock(&idetape_ref_mutex); | |
1da177e4 LT |
2247 | } |
2248 | ||
8fed4368 | 2249 | static void ide_tape_release(struct device *dev) |
1da177e4 | 2250 | { |
8fed4368 | 2251 | struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); |
1da177e4 LT |
2252 | ide_drive_t *drive = tape->drive; |
2253 | struct gendisk *g = tape->disk; | |
2254 | ||
01a63aeb | 2255 | BUG_ON(tape->merge_bh_size); |
8604affd | 2256 | |
97100fc8 | 2257 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 2258 | drive->driver_data = NULL; |
dbc1272e | 2259 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
2260 | device_destroy(idetape_sysfs_class, |
2261 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
2262 | idetape_devs[tape->minor] = NULL; |
2263 | g->private_data = NULL; | |
2264 | put_disk(g); | |
2265 | kfree(tape); | |
2266 | } | |
2267 | ||
ecfd80e4 | 2268 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
2269 | static int proc_idetape_read_name |
2270 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2271 | { | |
2272 | ide_drive_t *drive = (ide_drive_t *) data; | |
2273 | idetape_tape_t *tape = drive->driver_data; | |
2274 | char *out = page; | |
2275 | int len; | |
2276 | ||
2277 | len = sprintf(out, "%s\n", tape->name); | |
2278 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2279 | } | |
2280 | ||
2281 | static ide_proc_entry_t idetape_proc[] = { | |
2282 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2283 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2284 | { NULL, 0, NULL, NULL } | |
2285 | }; | |
79cb3803 BZ |
2286 | |
2287 | static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) | |
2288 | { | |
2289 | return idetape_proc; | |
2290 | } | |
2291 | ||
2292 | static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) | |
2293 | { | |
2294 | return idetape_settings; | |
2295 | } | |
1da177e4 LT |
2296 | #endif |
2297 | ||
4031bbe4 | 2298 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 2299 | |
7f3c868b | 2300 | static struct ide_driver idetape_driver = { |
8604affd | 2301 | .gen_driver = { |
4ef3b8f4 | 2302 | .owner = THIS_MODULE, |
8604affd BZ |
2303 | .name = "ide-tape", |
2304 | .bus = &ide_bus_type, | |
8604affd | 2305 | }, |
4031bbe4 RK |
2306 | .probe = ide_tape_probe, |
2307 | .remove = ide_tape_remove, | |
1da177e4 | 2308 | .version = IDETAPE_VERSION, |
1da177e4 LT |
2309 | .do_request = idetape_do_request, |
2310 | .end_request = idetape_end_request, | |
7662d046 | 2311 | #ifdef CONFIG_IDE_PROC_FS |
79cb3803 BZ |
2312 | .proc_entries = ide_tape_proc_entries, |
2313 | .proc_devsets = ide_tape_proc_devsets, | |
7662d046 | 2314 | #endif |
1da177e4 LT |
2315 | }; |
2316 | ||
3c98bf34 | 2317 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 2318 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
2319 | .owner = THIS_MODULE, |
2320 | .read = idetape_chrdev_read, | |
2321 | .write = idetape_chrdev_write, | |
2322 | .ioctl = idetape_chrdev_ioctl, | |
2323 | .open = idetape_chrdev_open, | |
2324 | .release = idetape_chrdev_release, | |
2325 | }; | |
2326 | ||
a4600f81 | 2327 | static int idetape_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 2328 | { |
a4600f81 | 2329 | struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk); |
1da177e4 | 2330 | |
5a04cfa9 | 2331 | if (!tape) |
1da177e4 LT |
2332 | return -ENXIO; |
2333 | ||
1da177e4 LT |
2334 | return 0; |
2335 | } | |
2336 | ||
a4600f81 | 2337 | static int idetape_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2338 | { |
5aeddf90 | 2339 | struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); |
1da177e4 LT |
2340 | |
2341 | ide_tape_put(tape); | |
1da177e4 LT |
2342 | return 0; |
2343 | } | |
2344 | ||
a4600f81 | 2345 | static int idetape_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
2346 | unsigned int cmd, unsigned long arg) |
2347 | { | |
5aeddf90 | 2348 | struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); |
1da177e4 | 2349 | ide_drive_t *drive = tape->drive; |
1bddd9e6 | 2350 | int err = generic_ide_ioctl(drive, bdev, cmd, arg); |
1da177e4 LT |
2351 | if (err == -EINVAL) |
2352 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2353 | return err; | |
2354 | } | |
2355 | ||
2356 | static struct block_device_operations idetape_block_ops = { | |
2357 | .owner = THIS_MODULE, | |
a4600f81 AV |
2358 | .open = idetape_open, |
2359 | .release = idetape_release, | |
2360 | .locked_ioctl = idetape_ioctl, | |
1da177e4 LT |
2361 | }; |
2362 | ||
4031bbe4 | 2363 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2364 | { |
2365 | idetape_tape_t *tape; | |
2366 | struct gendisk *g; | |
2367 | int minor; | |
2368 | ||
2369 | if (!strstr("ide-tape", drive->driver_req)) | |
2370 | goto failed; | |
2a924662 | 2371 | |
1da177e4 LT |
2372 | if (drive->media != ide_tape) |
2373 | goto failed; | |
2a924662 | 2374 | |
97100fc8 BZ |
2375 | if ((drive->dev_flags & IDE_DFLAG_ID_READ) && |
2376 | ide_check_atapi_device(drive, DRV_NAME) == 0) { | |
5a04cfa9 BP |
2377 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
2378 | " the driver\n", drive->name); | |
1da177e4 LT |
2379 | goto failed; |
2380 | } | |
5a04cfa9 | 2381 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2382 | if (tape == NULL) { |
5a04cfa9 BP |
2383 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2384 | drive->name); | |
1da177e4 LT |
2385 | goto failed; |
2386 | } | |
2387 | ||
2388 | g = alloc_disk(1 << PARTN_BITS); | |
2389 | if (!g) | |
2390 | goto out_free_tape; | |
2391 | ||
2392 | ide_init_disk(g, drive); | |
2393 | ||
8fed4368 BZ |
2394 | tape->dev.parent = &drive->gendev; |
2395 | tape->dev.release = ide_tape_release; | |
2396 | dev_set_name(&tape->dev, dev_name(&drive->gendev)); | |
2397 | ||
2398 | if (device_register(&tape->dev)) | |
2399 | goto out_free_disk; | |
1da177e4 LT |
2400 | |
2401 | tape->drive = drive; | |
2402 | tape->driver = &idetape_driver; | |
2403 | tape->disk = g; | |
2404 | ||
2405 | g->private_data = &tape->driver; | |
2406 | ||
2407 | drive->driver_data = tape; | |
2408 | ||
cf8b8975 | 2409 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2410 | for (minor = 0; idetape_devs[minor]; minor++) |
2411 | ; | |
2412 | idetape_devs[minor] = tape; | |
cf8b8975 | 2413 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2414 | |
2415 | idetape_setup(drive, tape, minor); | |
2416 | ||
3ee074bf GKH |
2417 | device_create(idetape_sysfs_class, &drive->gendev, |
2418 | MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); | |
2419 | device_create(idetape_sysfs_class, &drive->gendev, | |
2420 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
2421 | "n%s", tape->name); | |
d5dee80a | 2422 | |
1da177e4 LT |
2423 | g->fops = &idetape_block_ops; |
2424 | ide_register_region(g); | |
2425 | ||
2426 | return 0; | |
8604affd | 2427 | |
8fed4368 BZ |
2428 | out_free_disk: |
2429 | put_disk(g); | |
1da177e4 LT |
2430 | out_free_tape: |
2431 | kfree(tape); | |
2432 | failed: | |
8604affd | 2433 | return -ENODEV; |
1da177e4 LT |
2434 | } |
2435 | ||
5a04cfa9 | 2436 | static void __exit idetape_exit(void) |
1da177e4 | 2437 | { |
8604affd | 2438 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2439 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2440 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2441 | } | |
2442 | ||
17514e8a | 2443 | static int __init idetape_init(void) |
1da177e4 | 2444 | { |
d5dee80a WD |
2445 | int error = 1; |
2446 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2447 | if (IS_ERR(idetape_sysfs_class)) { | |
2448 | idetape_sysfs_class = NULL; | |
2449 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2450 | error = -EBUSY; | |
2451 | goto out; | |
2452 | } | |
2453 | ||
1da177e4 | 2454 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2455 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2456 | " interface\n"); | |
d5dee80a WD |
2457 | error = -EBUSY; |
2458 | goto out_free_class; | |
1da177e4 | 2459 | } |
d5dee80a WD |
2460 | |
2461 | error = driver_register(&idetape_driver.gen_driver); | |
2462 | if (error) | |
2463 | goto out_free_driver; | |
2464 | ||
2465 | return 0; | |
2466 | ||
2467 | out_free_driver: | |
2468 | driver_unregister(&idetape_driver.gen_driver); | |
2469 | out_free_class: | |
2470 | class_destroy(idetape_sysfs_class); | |
2471 | out: | |
2472 | return error; | |
1da177e4 LT |
2473 | } |
2474 | ||
263756ec | 2475 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2476 | module_init(idetape_init); |
2477 | module_exit(idetape_exit); | |
2478 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2479 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2480 | MODULE_LICENSE("GPL"); |