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Commit | Line | Data |
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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 | 133 | |
03056b90 BP |
134 | /* Tape door status */ |
135 | #define DOOR_UNLOCKED 0 | |
136 | #define DOOR_LOCKED 1 | |
137 | #define DOOR_EXPLICITLY_LOCKED 2 | |
138 | ||
139 | /* Some defines for the SPACE command */ | |
140 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
141 | #define IDETAPE_SPACE_TO_EOD 3 | |
142 | ||
143 | /* Some defines for the LOAD UNLOAD command */ | |
144 | #define IDETAPE_LU_LOAD_MASK 1 | |
145 | #define IDETAPE_LU_RETENSION_MASK 2 | |
146 | #define IDETAPE_LU_EOT_MASK 4 | |
147 | ||
03056b90 BP |
148 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ |
149 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
150 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
151 | ||
1da177e4 | 152 | /* |
3c98bf34 BP |
153 | * Most of our global data which we need to save even as we leave the driver due |
154 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
155 | */ |
156 | typedef struct ide_tape_obj { | |
7f3c868b BZ |
157 | ide_drive_t *drive; |
158 | struct ide_driver *driver; | |
159 | struct gendisk *disk; | |
8fed4368 | 160 | struct device dev; |
1da177e4 | 161 | |
2e8a6f89 BZ |
162 | /* used by REQ_IDETAPE_{READ,WRITE} requests */ |
163 | struct ide_atapi_pc queued_pc; | |
394a4c21 | 164 | |
1da177e4 | 165 | /* |
3c98bf34 | 166 | * DSC polling variables. |
1da177e4 | 167 | * |
3c98bf34 BP |
168 | * While polling for DSC we use postponed_rq to postpone the current |
169 | * request so that ide.c will be able to service pending requests on the | |
170 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 171 | * data transfer) request in the device request queue. |
1da177e4 LT |
172 | */ |
173 | struct request *postponed_rq; | |
174 | /* The time in which we started polling for DSC */ | |
175 | unsigned long dsc_polling_start; | |
176 | /* Timer used to poll for dsc */ | |
177 | struct timer_list dsc_timer; | |
178 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
179 | unsigned long best_dsc_rw_freq; |
180 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
181 | unsigned long dsc_timeout; |
182 | ||
3c98bf34 | 183 | /* Read position information */ |
1da177e4 LT |
184 | u8 partition; |
185 | /* Current block */ | |
54bb2074 | 186 | unsigned int first_frame; |
1da177e4 | 187 | |
3c98bf34 | 188 | /* Last error information */ |
1da177e4 LT |
189 | u8 sense_key, asc, ascq; |
190 | ||
3c98bf34 | 191 | /* Character device operation */ |
1da177e4 LT |
192 | unsigned int minor; |
193 | /* device name */ | |
194 | char name[4]; | |
195 | /* Current character device data transfer direction */ | |
54abf37e | 196 | u8 chrdev_dir; |
1da177e4 | 197 | |
54bb2074 BP |
198 | /* tape block size, usually 512 or 1024 bytes */ |
199 | unsigned short blk_size; | |
1da177e4 | 200 | int user_bs_factor; |
b6422013 | 201 | |
1da177e4 | 202 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 203 | u8 caps[20]; |
1da177e4 LT |
204 | |
205 | /* | |
3c98bf34 | 206 | * Active data transfer request parameters. |
1da177e4 | 207 | * |
3c98bf34 BP |
208 | * At most, there is only one ide-tape originated data transfer request |
209 | * in the device request queue. This allows ide.c to easily service | |
210 | * requests from the other device when we postpone our active request. | |
1da177e4 | 211 | */ |
83042b24 | 212 | |
3c98bf34 | 213 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 214 | int buffer_size; |
963da55c TH |
215 | /* Staging buffer of buffer_size bytes */ |
216 | void *buf; | |
217 | /* The read/write cursor */ | |
218 | void *cur; | |
219 | /* The number of valid bytes in buf */ | |
220 | size_t valid; | |
3c98bf34 | 221 | |
3c98bf34 | 222 | /* Measures average tape speed */ |
1da177e4 LT |
223 | unsigned long avg_time; |
224 | int avg_size; | |
225 | int avg_speed; | |
226 | ||
1da177e4 LT |
227 | /* the door is currently locked */ |
228 | int door_locked; | |
229 | /* the tape hardware is write protected */ | |
230 | char drv_write_prot; | |
231 | /* the tape is write protected (hardware or opened as read-only) */ | |
232 | char write_prot; | |
233 | ||
8004a8c9 | 234 | u32 debug_mask; |
1da177e4 LT |
235 | } idetape_tape_t; |
236 | ||
cf8b8975 | 237 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 238 | |
d5dee80a WD |
239 | static struct class *idetape_sysfs_class; |
240 | ||
8fed4368 | 241 | static void ide_tape_release(struct device *); |
08da591e | 242 | |
9d01e4cd BP |
243 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
244 | ||
245 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev, | |
246 | unsigned int i) | |
1da177e4 LT |
247 | { |
248 | struct ide_tape_obj *tape = NULL; | |
249 | ||
cf8b8975 | 250 | mutex_lock(&idetape_ref_mutex); |
9d01e4cd BP |
251 | |
252 | if (cdev) | |
253 | tape = idetape_devs[i]; | |
254 | else | |
255 | tape = ide_drv_g(disk, ide_tape_obj); | |
256 | ||
08da591e | 257 | if (tape) { |
d3e33ff5 | 258 | if (ide_device_get(tape->drive)) |
08da591e | 259 | tape = NULL; |
d3e33ff5 | 260 | else |
8fed4368 | 261 | get_device(&tape->dev); |
08da591e | 262 | } |
9d01e4cd | 263 | |
cf8b8975 | 264 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
265 | return tape; |
266 | } | |
267 | ||
1da177e4 LT |
268 | static void ide_tape_put(struct ide_tape_obj *tape) |
269 | { | |
d3e33ff5 BZ |
270 | ide_drive_t *drive = tape->drive; |
271 | ||
cf8b8975 | 272 | mutex_lock(&idetape_ref_mutex); |
8fed4368 | 273 | put_device(&tape->dev); |
d3e33ff5 | 274 | ide_device_put(drive); |
cf8b8975 | 275 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
276 | } |
277 | ||
1da177e4 | 278 | /* |
1b5db434 BP |
279 | * called on each failed packet command retry to analyze the request sense. We |
280 | * currently do not utilize this information. | |
1da177e4 | 281 | */ |
1b5db434 | 282 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
283 | { |
284 | idetape_tape_t *tape = drive->driver_data; | |
5e2040fd | 285 | struct ide_atapi_pc *pc = drive->failed_pc; |
1da177e4 | 286 | |
1b5db434 BP |
287 | tape->sense_key = sense[2] & 0xF; |
288 | tape->asc = sense[12]; | |
289 | tape->ascq = sense[13]; | |
8004a8c9 BP |
290 | |
291 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
292 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 293 | |
d236d74c | 294 | /* Correct pc->xferred by asking the tape. */ |
21d9c5d2 | 295 | if (pc->flags & PC_FLAG_DMA_ERROR) |
d236d74c | 296 | pc->xferred = pc->req_xfer - |
54bb2074 | 297 | tape->blk_size * |
5d0cc8ae | 298 | get_unaligned_be32(&sense[3]); |
1da177e4 LT |
299 | |
300 | /* | |
301 | * If error was the result of a zero-length read or write command, | |
302 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
303 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
304 | */ | |
90699ce2 | 305 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
306 | /* length == 0 */ |
307 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
308 | if (tape->sense_key == 5) { | |
1da177e4 LT |
309 | /* don't report an error, everything's ok */ |
310 | pc->error = 0; | |
311 | /* don't retry read/write */ | |
346331f8 | 312 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
313 | } |
314 | } | |
90699ce2 | 315 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
c152cc1a | 316 | pc->error = IDE_DRV_ERROR_FILEMARK; |
346331f8 | 317 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 318 | } |
90699ce2 | 319 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
320 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
321 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
c152cc1a | 322 | pc->error = IDE_DRV_ERROR_EOD; |
346331f8 | 323 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
324 | } |
325 | } | |
90699ce2 | 326 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 327 | if (tape->sense_key == 8) { |
c152cc1a | 328 | pc->error = IDE_DRV_ERROR_EOD; |
346331f8 | 329 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 330 | } |
346331f8 | 331 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 332 | pc->xferred) |
1da177e4 LT |
333 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
334 | } | |
335 | } | |
336 | ||
b14c7212 BZ |
337 | static void ide_tape_handle_dsc(ide_drive_t *); |
338 | ||
03a2faae | 339 | static int ide_tape_callback(ide_drive_t *drive, int dsc) |
1da177e4 LT |
340 | { |
341 | idetape_tape_t *tape = drive->driver_data; | |
2b9efba4 | 342 | struct ide_atapi_pc *pc = drive->pc; |
313afea7 | 343 | struct request *rq = drive->hwif->rq; |
5985e6ab | 344 | int uptodate = pc->error ? 0 : 1; |
313afea7 | 345 | int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; |
1da177e4 | 346 | |
8004a8c9 BP |
347 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
348 | ||
b14c7212 BZ |
349 | if (dsc) |
350 | ide_tape_handle_dsc(drive); | |
351 | ||
5e2040fd BZ |
352 | if (drive->failed_pc == pc) |
353 | drive->failed_pc = NULL; | |
dd2e9a03 | 354 | |
5985e6ab BZ |
355 | if (pc->c[0] == REQUEST_SENSE) { |
356 | if (uptodate) | |
357 | idetape_analyze_error(drive, pc->buf); | |
358 | else | |
359 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
360 | "itself - Aborting request!\n"); | |
361 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
5985e6ab BZ |
362 | int blocks = pc->xferred / tape->blk_size; |
363 | ||
364 | tape->avg_size += blocks * tape->blk_size; | |
365 | ||
366 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
367 | tape->avg_speed = tape->avg_size * HZ / | |
368 | (jiffies - tape->avg_time) / 1024; | |
369 | tape->avg_size = 0; | |
370 | tape->avg_time = jiffies; | |
371 | } | |
372 | ||
373 | tape->first_frame += blocks; | |
21d9c5d2 | 374 | rq->data_len -= blocks * tape->blk_size; |
5985e6ab | 375 | |
313afea7 BZ |
376 | if (pc->error) { |
377 | uptodate = 0; | |
378 | err = pc->error; | |
379 | } | |
5985e6ab | 380 | } else if (pc->c[0] == READ_POSITION && uptodate) { |
2b9efba4 | 381 | u8 *readpos = pc->buf; |
5985e6ab BZ |
382 | |
383 | debug_log(DBG_SENSE, "BOP - %s\n", | |
384 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
385 | debug_log(DBG_SENSE, "EOP - %s\n", | |
386 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
387 | ||
388 | if (readpos[0] & 0x4) { | |
389 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
390 | "to the tape\n"); | |
49d8078a BP |
391 | clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), |
392 | &drive->atapi_flags); | |
5985e6ab | 393 | uptodate = 0; |
313afea7 | 394 | err = IDE_DRV_ERROR_GENERAL; |
5985e6ab BZ |
395 | } else { |
396 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
cd740ab0 | 397 | be32_to_cpup((__be32 *)&readpos[4])); |
5985e6ab BZ |
398 | |
399 | tape->partition = readpos[1]; | |
cd740ab0 | 400 | tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); |
49d8078a BP |
401 | set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), |
402 | &drive->atapi_flags); | |
5985e6ab | 403 | } |
1da177e4 | 404 | } |
5985e6ab | 405 | |
313afea7 BZ |
406 | rq->errors = err; |
407 | ||
03a2faae | 408 | return uptodate; |
1da177e4 LT |
409 | } |
410 | ||
1da177e4 | 411 | /* |
3c98bf34 | 412 | * Postpone the current request so that ide.c will be able to service requests |
b65fac32 | 413 | * from another device on the same port while we are polling for DSC. |
1da177e4 | 414 | */ |
5a04cfa9 | 415 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
416 | { |
417 | idetape_tape_t *tape = drive->driver_data; | |
418 | ||
8004a8c9 BP |
419 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
420 | ||
b65fac32 BZ |
421 | tape->postponed_rq = drive->hwif->rq; |
422 | ||
54bb2074 | 423 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
424 | } |
425 | ||
74e63e74 BZ |
426 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
427 | { | |
428 | idetape_tape_t *tape = drive->driver_data; | |
429 | ||
430 | /* Media access command */ | |
431 | tape->dsc_polling_start = jiffies; | |
432 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
433 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
434 | /* Allow ide.c to handle other requests */ | |
435 | idetape_postpone_request(drive); | |
436 | } | |
437 | ||
1da177e4 | 438 | /* |
3c98bf34 | 439 | * Packet Command Interface |
1da177e4 | 440 | * |
2b9efba4 | 441 | * The current Packet Command is available in drive->pc, and will not change |
3c98bf34 BP |
442 | * until we finish handling it. Each packet command is associated with a |
443 | * callback function that will be called when the command is finished. | |
1da177e4 | 444 | * |
3c98bf34 | 445 | * The handling will be done in three stages: |
1da177e4 | 446 | * |
b788ee9c | 447 | * 1. ide_tape_issue_pc will send the packet command to the drive, and will set |
aa5d2de7 | 448 | * the interrupt handler to ide_pc_intr. |
1da177e4 | 449 | * |
aa5d2de7 | 450 | * 2. On each interrupt, ide_pc_intr will be called. This step will be |
3c98bf34 | 451 | * repeated until the device signals us that no more interrupts will be issued. |
1da177e4 | 452 | * |
3c98bf34 BP |
453 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
454 | * process. In case of a successful initiation of a media access packet command, | |
455 | * the DSC bit will be set when the actual execution of the command is finished. | |
456 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
457 | * event. In this case, we define the request as "low priority request" by | |
458 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
459 | * exit the driver. | |
1da177e4 | 460 | * |
3c98bf34 BP |
461 | * ide.c will then give higher priority to requests which originate from the |
462 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 463 | * |
3c98bf34 | 464 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 465 | * |
3c98bf34 BP |
466 | * 5. In case an error was found, we queue a request sense packet command in |
467 | * front of the request queue and retry the operation up to | |
468 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 469 | * |
3c98bf34 BP |
470 | * 6. In case no error was found, or we decided to give up and not to retry |
471 | * again, the callback function will be called and then we will handle the next | |
472 | * request. | |
1da177e4 | 473 | */ |
1da177e4 | 474 | |
b788ee9c BZ |
475 | static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, |
476 | struct ide_cmd *cmd, | |
477 | struct ide_atapi_pc *pc) | |
1da177e4 | 478 | { |
1da177e4 | 479 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 480 | |
5e2040fd BZ |
481 | if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
482 | drive->failed_pc = pc; | |
2b9efba4 | 483 | |
1da177e4 | 484 | /* Set the current packet command */ |
2b9efba4 | 485 | drive->pc = pc; |
1da177e4 LT |
486 | |
487 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 488 | (pc->flags & PC_FLAG_ABORT)) { |
b3071d19 TH |
489 | unsigned int done = blk_rq_bytes(drive->hwif->rq); |
490 | ||
1da177e4 | 491 | /* |
3c98bf34 BP |
492 | * We will "abort" retrying a packet command in case legitimate |
493 | * error code was received (crossing a filemark, or end of the | |
494 | * media, for example). | |
1da177e4 | 495 | */ |
346331f8 | 496 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 497 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
498 | tape->sense_key == 2 && tape->asc == 4 && |
499 | (tape->ascq == 1 || tape->ascq == 8))) { | |
500 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
501 | "pc = %2x, key = %2x, " | |
502 | "asc = %2x, ascq = %2x\n", | |
503 | tape->name, pc->c[0], | |
504 | tape->sense_key, tape->asc, | |
505 | tape->ascq); | |
506 | } | |
507 | /* Giving up */ | |
c152cc1a | 508 | pc->error = IDE_DRV_ERROR_GENERAL; |
1da177e4 | 509 | } |
b3071d19 | 510 | |
5e2040fd | 511 | drive->failed_pc = NULL; |
b14c7212 | 512 | drive->pc_callback(drive, 0); |
b3071d19 | 513 | ide_complete_rq(drive, -EIO, done); |
92f5daff | 514 | return ide_stopped; |
1da177e4 | 515 | } |
8004a8c9 | 516 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
517 | |
518 | pc->retries++; | |
1da177e4 | 519 | |
b788ee9c | 520 | return ide_issue_pc(drive, cmd); |
1da177e4 LT |
521 | } |
522 | ||
3c98bf34 | 523 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 524 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 | 525 | { |
7bf7420a | 526 | ide_init_pc(pc); |
90699ce2 | 527 | pc->c[0] = MODE_SENSE; |
1da177e4 | 528 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
529 | /* DBD = 1 - Don't return block descriptors */ |
530 | pc->c[1] = 8; | |
1da177e4 LT |
531 | pc->c[2] = page_code; |
532 | /* | |
533 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
534 | * | |
535 | * For SCSI this byte is defined as subpage instead of high byte | |
536 | * of length and some IDE drives seem to interpret it this way | |
537 | * and return an error when 255 is used. | |
538 | */ | |
539 | pc->c[3] = 0; | |
3c98bf34 BP |
540 | /* We will just discard data in that case */ |
541 | pc->c[4] = 255; | |
1da177e4 | 542 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 543 | pc->req_xfer = 12; |
1da177e4 | 544 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 545 | pc->req_xfer = 24; |
1da177e4 | 546 | else |
d236d74c | 547 | pc->req_xfer = 50; |
1da177e4 LT |
548 | } |
549 | ||
5a04cfa9 | 550 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 551 | { |
b73c7ee2 | 552 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 553 | idetape_tape_t *tape = drive->driver_data; |
2b9efba4 | 554 | struct ide_atapi_pc *pc = drive->pc; |
22c525b9 | 555 | u8 stat; |
1da177e4 | 556 | |
374e042c | 557 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 558 | |
3a7d2484 BZ |
559 | if (stat & ATA_DSC) { |
560 | if (stat & ATA_ERR) { | |
1da177e4 | 561 | /* Error detected */ |
90699ce2 | 562 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
563 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
564 | tape->name); | |
565 | /* Retry operation */ | |
6b544fcc | 566 | ide_retry_pc(drive); |
258ec411 | 567 | return ide_stopped; |
1da177e4 LT |
568 | } |
569 | pc->error = 0; | |
1da177e4 | 570 | } else { |
c152cc1a | 571 | pc->error = IDE_DRV_ERROR_GENERAL; |
5e2040fd | 572 | drive->failed_pc = NULL; |
1da177e4 | 573 | } |
b14c7212 | 574 | drive->pc_callback(drive, 0); |
1da177e4 LT |
575 | return ide_stopped; |
576 | } | |
577 | ||
cd2abbfe | 578 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
579 | struct ide_atapi_pc *pc, struct request *rq, |
580 | u8 opcode) | |
1da177e4 | 581 | { |
963da55c | 582 | unsigned int length = rq->nr_sectors; |
0014c75b | 583 | |
7bf7420a | 584 | ide_init_pc(pc); |
860ff5ec | 585 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 586 | pc->c[1] = 1; |
d236d74c BP |
587 | pc->buf = NULL; |
588 | pc->buf_size = length * tape->blk_size; | |
589 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 590 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 591 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 592 | |
963da55c | 593 | if (opcode == READ_6) |
cd2abbfe | 594 | pc->c[0] = READ_6; |
963da55c | 595 | else if (opcode == WRITE_6) { |
cd2abbfe BP |
596 | pc->c[0] = WRITE_6; |
597 | pc->flags |= PC_FLAG_WRITING; | |
cd2abbfe | 598 | } |
0014c75b BP |
599 | |
600 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
601 | } |
602 | ||
1da177e4 LT |
603 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
604 | struct request *rq, sector_t block) | |
605 | { | |
b73c7ee2 | 606 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 607 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 608 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 609 | struct request *postponed_rq = tape->postponed_rq; |
b788ee9c | 610 | struct ide_cmd cmd; |
22c525b9 | 611 | u8 stat; |
1da177e4 | 612 | |
e8e7526c | 613 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu\n", |
963da55c | 614 | (unsigned long long)rq->sector, rq->nr_sectors); |
1da177e4 | 615 | |
6b544fcc | 616 | if (!(blk_special_request(rq) || blk_sense_request(rq))) { |
3c98bf34 | 617 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 618 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 619 | "request queue (%d)\n", drive->name, rq->cmd_type); |
89f78b32 BZ |
620 | if (blk_fs_request(rq) == 0 && rq->errors == 0) |
621 | rq->errors = -EIO; | |
130e8867 | 622 | ide_complete_rq(drive, -EIO, ide_rq_bytes(rq)); |
1da177e4 LT |
623 | return ide_stopped; |
624 | } | |
625 | ||
3c98bf34 | 626 | /* Retry a failed packet command */ |
5e2040fd BZ |
627 | if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { |
628 | pc = drive->failed_pc; | |
28c7214b BZ |
629 | goto out; |
630 | } | |
5a04cfa9 | 631 | |
1da177e4 LT |
632 | if (postponed_rq != NULL) |
633 | if (rq != postponed_rq) { | |
634 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
635 | "Two DSC requests were queued\n"); | |
313afea7 | 636 | drive->failed_pc = NULL; |
6902a533 | 637 | rq->errors = 0; |
f974b196 | 638 | ide_complete_rq(drive, 0, blk_rq_bytes(rq)); |
1da177e4 LT |
639 | return ide_stopped; |
640 | } | |
1da177e4 LT |
641 | |
642 | tape->postponed_rq = NULL; | |
643 | ||
644 | /* | |
645 | * If the tape is still busy, postpone our request and service | |
646 | * the other device meanwhile. | |
647 | */ | |
374e042c | 648 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 649 | |
97100fc8 BZ |
650 | if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && |
651 | (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) | |
626542ca | 652 | drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; |
1da177e4 | 653 | |
97100fc8 | 654 | if (drive->dev_flags & IDE_DFLAG_POST_RESET) { |
626542ca | 655 | drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; |
97100fc8 | 656 | drive->dev_flags &= ~IDE_DFLAG_POST_RESET; |
1da177e4 LT |
657 | } |
658 | ||
626542ca BP |
659 | if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) && |
660 | !(stat & ATA_DSC)) { | |
1da177e4 LT |
661 | if (postponed_rq == NULL) { |
662 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 663 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
664 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
665 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
666 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
667 | tape->name); | |
83dd5735 | 668 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
669 | idetape_media_access_finished(drive); |
670 | return ide_stopped; | |
671 | } else { | |
672 | return ide_do_reset(drive); | |
673 | } | |
5a04cfa9 BP |
674 | } else if (time_after(jiffies, |
675 | tape->dsc_polling_start + | |
676 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 677 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
678 | idetape_postpone_request(drive); |
679 | return ide_stopped; | |
626542ca BP |
680 | } else |
681 | drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC; | |
682 | ||
83dd5735 | 683 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
2e8a6f89 | 684 | pc = &tape->queued_pc; |
0014c75b | 685 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
686 | goto out; |
687 | } | |
83dd5735 | 688 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
2e8a6f89 | 689 | pc = &tape->queued_pc; |
0014c75b | 690 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
691 | goto out; |
692 | } | |
83dd5735 | 693 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
c267cc1c | 694 | pc = (struct ide_atapi_pc *)rq->special; |
83dd5735 BP |
695 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
696 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
697 | goto out; |
698 | } | |
83dd5735 | 699 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
700 | idetape_media_access_finished(drive); |
701 | return ide_stopped; | |
702 | } | |
703 | BUG(); | |
28c7214b | 704 | |
f2e3ab52 | 705 | out: |
6b544fcc BP |
706 | /* prepare sense request for this command */ |
707 | ide_prep_sense(drive, rq); | |
708 | ||
b788ee9c BZ |
709 | memset(&cmd, 0, sizeof(cmd)); |
710 | ||
711 | if (rq_data_dir(rq)) | |
712 | cmd.tf_flags |= IDE_TFLAG_WRITE; | |
713 | ||
714 | cmd.rq = rq; | |
715 | ||
5c4be572 TH |
716 | ide_init_sg_cmd(&cmd, pc->req_xfer); |
717 | ide_map_sg(drive, &cmd); | |
718 | ||
b788ee9c | 719 | return ide_tape_issue_pc(drive, &cmd, pc); |
1da177e4 LT |
720 | } |
721 | ||
1da177e4 | 722 | /* |
3c98bf34 BP |
723 | * Write a filemark if write_filemark=1. Flush the device buffers without |
724 | * writing a filemark otherwise. | |
1da177e4 | 725 | */ |
5a04cfa9 | 726 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 727 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 | 728 | { |
7bf7420a | 729 | ide_init_pc(pc); |
90699ce2 | 730 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 731 | pc->c[4] = write_filemark; |
346331f8 | 732 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
733 | } |
734 | ||
1da177e4 LT |
735 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
736 | { | |
737 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 738 | struct gendisk *disk = tape->disk; |
1da177e4 LT |
739 | int load_attempted = 0; |
740 | ||
3c98bf34 | 741 | /* Wait for the tape to become ready */ |
49d8078a | 742 | set_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), &drive->atapi_flags); |
1da177e4 LT |
743 | timeout += jiffies; |
744 | while (time_before(jiffies, timeout)) { | |
de699ad5 | 745 | if (ide_do_test_unit_ready(drive, disk) == 0) |
1da177e4 LT |
746 | return 0; |
747 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
748 | || (tape->asc == 0x3A)) { |
749 | /* no media */ | |
1da177e4 LT |
750 | if (load_attempted) |
751 | return -ENOMEDIUM; | |
0c8a6c7a | 752 | ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
1da177e4 LT |
753 | load_attempted = 1; |
754 | /* not about to be ready */ | |
755 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
756 | (tape->ascq == 1 || tape->ascq == 8))) | |
757 | return -EIO; | |
80ce45fd | 758 | msleep(100); |
1da177e4 LT |
759 | } |
760 | return -EIO; | |
761 | } | |
762 | ||
5a04cfa9 | 763 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 764 | { |
2ac07d92 | 765 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 766 | struct ide_atapi_pc pc; |
1da177e4 LT |
767 | int rc; |
768 | ||
769 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
2ac07d92 | 770 | rc = ide_queue_pc_tail(drive, tape->disk, &pc); |
5a04cfa9 | 771 | if (rc) |
1da177e4 LT |
772 | return rc; |
773 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
774 | return 0; | |
775 | } | |
776 | ||
d236d74c | 777 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 778 | { |
7bf7420a | 779 | ide_init_pc(pc); |
90699ce2 | 780 | pc->c[0] = READ_POSITION; |
d236d74c | 781 | pc->req_xfer = 20; |
1da177e4 LT |
782 | } |
783 | ||
5a04cfa9 | 784 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
785 | { |
786 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 787 | struct ide_atapi_pc pc; |
1da177e4 LT |
788 | int position; |
789 | ||
8004a8c9 | 790 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
791 | |
792 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 793 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) |
1da177e4 | 794 | return -1; |
54bb2074 | 795 | position = tape->first_frame; |
1da177e4 LT |
796 | return position; |
797 | } | |
798 | ||
d236d74c BP |
799 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
800 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 801 | unsigned int block, u8 partition, int skip) |
1da177e4 | 802 | { |
7bf7420a | 803 | ide_init_pc(pc); |
90699ce2 | 804 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 805 | pc->c[1] = 2; |
860ff5ec | 806 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 807 | pc->c[8] = partition; |
346331f8 | 808 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
809 | } |
810 | ||
ec0fdb01 | 811 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
812 | { |
813 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 814 | |
54abf37e | 815 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 816 | return; |
1da177e4 | 817 | |
49d8078a | 818 | clear_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags); |
963da55c TH |
819 | tape->valid = 0; |
820 | if (tape->buf != NULL) { | |
821 | kfree(tape->buf); | |
822 | tape->buf = NULL; | |
1da177e4 LT |
823 | } |
824 | ||
54abf37e | 825 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
826 | } |
827 | ||
828 | /* | |
3c98bf34 BP |
829 | * Position the tape to the requested block using the LOCATE packet command. |
830 | * A READ POSITION command is then issued to check where we are positioned. Like | |
831 | * all higher level operations, we queue the commands at the tail of the request | |
832 | * queue and wait for their completion. | |
1da177e4 | 833 | */ |
5a04cfa9 BP |
834 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
835 | u8 partition, int skip) | |
1da177e4 LT |
836 | { |
837 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 838 | struct gendisk *disk = tape->disk; |
1da177e4 | 839 | int retval; |
d236d74c | 840 | struct ide_atapi_pc pc; |
1da177e4 | 841 | |
54abf37e | 842 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 843 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
844 | idetape_wait_ready(drive, 60 * 5 * HZ); |
845 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
2ac07d92 | 846 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
847 | if (retval) |
848 | return (retval); | |
849 | ||
850 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 851 | return ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
852 | } |
853 | ||
ec0fdb01 | 854 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 855 | int restore_position) |
1da177e4 LT |
856 | { |
857 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
858 | int seek, position; |
859 | ||
ec0fdb01 | 860 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
861 | if (restore_position) { |
862 | position = idetape_read_position(drive); | |
9798630a | 863 | seek = position > 0 ? position : 0; |
1da177e4 | 864 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 865 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 866 | " %s\n", tape->name, __func__); |
1da177e4 LT |
867 | return; |
868 | } | |
869 | } | |
870 | } | |
871 | ||
872 | /* | |
3c98bf34 BP |
873 | * Generate a read/write request for the block device interface and wait for it |
874 | * to be serviced. | |
1da177e4 | 875 | */ |
6bb11dd1 | 876 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) |
1da177e4 LT |
877 | { |
878 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a | 879 | struct request *rq; |
21d9c5d2 | 880 | int ret; |
1da177e4 | 881 | |
8004a8c9 | 882 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
21d9c5d2 | 883 | BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); |
6bb11dd1 | 884 | BUG_ON(size < 0 || size % tape->blk_size); |
8004a8c9 | 885 | |
64ea1b4a FT |
886 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
887 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 888 | rq->cmd[13] = cmd; |
64ea1b4a | 889 | rq->rq_disk = tape->disk; |
64ea1b4a | 890 | rq->sector = tape->first_frame; |
21d9c5d2 TH |
891 | |
892 | if (size) { | |
963da55c | 893 | ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, |
21d9c5d2 TH |
894 | __GFP_WAIT); |
895 | if (ret) | |
896 | goto out_put; | |
897 | } | |
898 | ||
64ea1b4a FT |
899 | blk_execute_rq(drive->queue, tape->disk, rq, 0); |
900 | ||
963da55c | 901 | /* calculate the number of transferred bytes and update buffer state */ |
21d9c5d2 | 902 | size -= rq->data_len; |
963da55c | 903 | tape->cur = tape->buf; |
21d9c5d2 | 904 | if (cmd == REQ_IDETAPE_READ) |
963da55c TH |
905 | tape->valid = size; |
906 | else | |
907 | tape->valid = 0; | |
1da177e4 | 908 | |
21d9c5d2 TH |
909 | ret = size; |
910 | if (rq->errors == IDE_DRV_ERROR_GENERAL) | |
911 | ret = -EIO; | |
21d9c5d2 TH |
912 | out_put: |
913 | blk_put_request(rq); | |
64ea1b4a | 914 | return ret; |
1da177e4 LT |
915 | } |
916 | ||
d236d74c | 917 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 918 | { |
7bf7420a | 919 | ide_init_pc(pc); |
90699ce2 | 920 | pc->c[0] = INQUIRY; |
5a04cfa9 | 921 | pc->c[4] = 254; |
d236d74c | 922 | pc->req_xfer = 254; |
1da177e4 LT |
923 | } |
924 | ||
d236d74c BP |
925 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
926 | struct ide_atapi_pc *pc) | |
1da177e4 | 927 | { |
7bf7420a | 928 | ide_init_pc(pc); |
90699ce2 | 929 | pc->c[0] = REZERO_UNIT; |
346331f8 | 930 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
931 | } |
932 | ||
d236d74c | 933 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 934 | { |
7bf7420a | 935 | ide_init_pc(pc); |
90699ce2 | 936 | pc->c[0] = ERASE; |
1da177e4 | 937 | pc->c[1] = 1; |
346331f8 | 938 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
939 | } |
940 | ||
d236d74c | 941 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 | 942 | { |
7bf7420a | 943 | ide_init_pc(pc); |
90699ce2 | 944 | pc->c[0] = SPACE; |
860ff5ec | 945 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 946 | pc->c[1] = cmd; |
346331f8 | 947 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
948 | } |
949 | ||
d9df937a | 950 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
951 | { |
952 | idetape_tape_t *tape = drive->driver_data; | |
55a5d291 | 953 | |
54abf37e | 954 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 955 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 956 | " but we are not writing.\n"); |
1da177e4 LT |
957 | return; |
958 | } | |
963da55c | 959 | if (tape->buf) { |
6bb11dd1 TH |
960 | size_t aligned = roundup(tape->valid, tape->blk_size); |
961 | ||
962 | memset(tape->cur, 0, aligned - tape->valid); | |
07bd9686 | 963 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned); |
963da55c TH |
964 | kfree(tape->buf); |
965 | tape->buf = NULL; | |
1da177e4 | 966 | } |
54abf37e | 967 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
968 | } |
969 | ||
88f1b941 | 970 | static int idetape_init_rw(ide_drive_t *drive, int dir) |
1da177e4 LT |
971 | { |
972 | idetape_tape_t *tape = drive->driver_data; | |
88f1b941 | 973 | int rc; |
1da177e4 | 974 | |
88f1b941 | 975 | BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); |
1da177e4 | 976 | |
88f1b941 TH |
977 | if (tape->chrdev_dir == dir) |
978 | return 0; | |
979 | ||
980 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
981 | ide_tape_discard_merge_buffer(drive, 1); | |
982 | else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
983 | ide_tape_flush_merge_buffer(drive); | |
984 | idetape_flush_tape_buffers(drive); | |
985 | } | |
986 | ||
987 | if (tape->buf || tape->valid) { | |
988 | printk(KERN_ERR "ide-tape: valid should be 0 now\n"); | |
989 | tape->valid = 0; | |
990 | } | |
991 | ||
992 | tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); | |
993 | if (!tape->buf) | |
994 | return -ENOMEM; | |
995 | tape->chrdev_dir = dir; | |
996 | tape->cur = tape->buf; | |
997 | ||
998 | /* | |
999 | * Issue a 0 rw command to ensure that DSC handshake is | |
1000 | * switched from completion mode to buffer available mode. No | |
1001 | * point in issuing this if DSC overlap isn't supported, some | |
1002 | * drives (Seagate STT3401A) will return an error. | |
1003 | */ | |
1004 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { | |
1005 | int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ | |
1006 | : REQ_IDETAPE_WRITE; | |
1007 | ||
1008 | rc = idetape_queue_rw_tail(drive, cmd, 0); | |
1009 | if (rc < 0) { | |
1010 | kfree(tape->buf); | |
1011 | tape->buf = NULL; | |
1012 | tape->chrdev_dir = IDETAPE_DIR_NONE; | |
1013 | return rc; | |
1da177e4 LT |
1014 | } |
1015 | } | |
5e69bd95 | 1016 | |
1da177e4 LT |
1017 | return 0; |
1018 | } | |
1019 | ||
5a04cfa9 | 1020 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1021 | { |
1022 | idetape_tape_t *tape = drive->driver_data; | |
963da55c TH |
1023 | |
1024 | memset(tape->buf, 0, tape->buffer_size); | |
3c98bf34 | 1025 | |
1da177e4 | 1026 | while (bcount) { |
963da55c | 1027 | unsigned int count = min(tape->buffer_size, bcount); |
1da177e4 | 1028 | |
6bb11dd1 | 1029 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); |
1da177e4 | 1030 | bcount -= count; |
1da177e4 LT |
1031 | } |
1032 | } | |
1033 | ||
1da177e4 | 1034 | /* |
3c98bf34 BP |
1035 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1036 | * currently support only one partition. | |
1037 | */ | |
5a04cfa9 | 1038 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 | 1039 | { |
2ac07d92 BZ |
1040 | struct ide_tape_obj *tape = drive->driver_data; |
1041 | struct gendisk *disk = tape->disk; | |
1da177e4 | 1042 | int retval; |
d236d74c | 1043 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1044 | |
1045 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1046 | ||
1da177e4 | 1047 | idetape_create_rewind_cmd(drive, &pc); |
2ac07d92 | 1048 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1049 | if (retval) |
1050 | return retval; | |
1051 | ||
1052 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1053 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1054 | if (retval) |
1055 | return retval; | |
1056 | return 0; | |
1057 | } | |
1058 | ||
3c98bf34 | 1059 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1060 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1061 | unsigned long arg) | |
1da177e4 LT |
1062 | { |
1063 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1064 | void __user *argp = (void __user *)arg; |
1065 | ||
d59823fa BP |
1066 | struct idetape_config { |
1067 | int dsc_rw_frequency; | |
1068 | int dsc_media_access_frequency; | |
1069 | int nr_stages; | |
1070 | } config; | |
1071 | ||
8004a8c9 BP |
1072 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1073 | ||
1da177e4 | 1074 | switch (cmd) { |
5a04cfa9 BP |
1075 | case 0x0340: |
1076 | if (copy_from_user(&config, argp, sizeof(config))) | |
1077 | return -EFAULT; | |
1078 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1079 | break; |
1080 | case 0x0350: | |
1081 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1082 | config.nr_stages = 1; |
5a04cfa9 BP |
1083 | if (copy_to_user(argp, &config, sizeof(config))) |
1084 | return -EFAULT; | |
1085 | break; | |
1086 | default: | |
1087 | return -EIO; | |
1da177e4 LT |
1088 | } |
1089 | return 0; | |
1090 | } | |
1091 | ||
5a04cfa9 BP |
1092 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1093 | int mt_count) | |
1da177e4 LT |
1094 | { |
1095 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1096 | struct gendisk *disk = tape->disk; |
d236d74c | 1097 | struct ide_atapi_pc pc; |
5a04cfa9 | 1098 | int retval, count = 0; |
b6422013 | 1099 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1100 | |
1101 | if (mt_count == 0) | |
1102 | return 0; | |
1103 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1104 | if (!sprev) |
1da177e4 | 1105 | return -EIO; |
5a04cfa9 | 1106 | mt_count = -mt_count; |
1da177e4 LT |
1107 | } |
1108 | ||
54abf37e | 1109 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
963da55c | 1110 | tape->valid = 0; |
49d8078a BP |
1111 | if (test_and_clear_bit(ilog2(IDE_AFLAG_FILEMARK), |
1112 | &drive->atapi_flags)) | |
1da177e4 | 1113 | ++count; |
ec0fdb01 | 1114 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1115 | } |
1116 | ||
1da177e4 | 1117 | switch (mt_op) { |
5a04cfa9 BP |
1118 | case MTFSF: |
1119 | case MTBSF: | |
1120 | idetape_create_space_cmd(&pc, mt_count - count, | |
1121 | IDETAPE_SPACE_OVER_FILEMARK); | |
2ac07d92 | 1122 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1123 | case MTFSFM: |
1124 | case MTBSFM: | |
1125 | if (!sprev) | |
1126 | return -EIO; | |
1127 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1128 | mt_count - count); | |
1129 | if (retval) | |
1130 | return retval; | |
1131 | count = (MTBSFM == mt_op ? 1 : -1); | |
1132 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1133 | default: | |
1134 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1135 | mt_op); | |
1136 | return -EIO; | |
1da177e4 LT |
1137 | } |
1138 | } | |
1139 | ||
1da177e4 | 1140 | /* |
3c98bf34 | 1141 | * Our character device read / write functions. |
1da177e4 | 1142 | * |
3c98bf34 BP |
1143 | * The tape is optimized to maximize throughput when it is transferring an |
1144 | * integral number of the "continuous transfer limit", which is a parameter of | |
1145 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1146 | * |
3c98bf34 BP |
1147 | * As of version 1.3 of the driver, the character device provides an abstract |
1148 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1149 | * same backup/restore procedure is supported. The driver will internally | |
1150 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1151 | * between the user's block size to the recommended size will only result in a | |
1152 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1153 | * This is not applicable to Onstream. | |
1da177e4 | 1154 | */ |
5a04cfa9 BP |
1155 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1156 | size_t count, loff_t *ppos) | |
1da177e4 | 1157 | { |
5aeddf90 | 1158 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1159 | ide_drive_t *drive = tape->drive; |
07bd9686 | 1160 | size_t done = 0; |
dcd96379 | 1161 | ssize_t ret = 0; |
07bd9686 | 1162 | int rc; |
1da177e4 | 1163 | |
8004a8c9 | 1164 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1165 | |
54abf37e | 1166 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
49d8078a | 1167 | if (test_bit(ilog2(IDE_AFLAG_DETECT_BS), &drive->atapi_flags)) |
54bb2074 BP |
1168 | if (count > tape->blk_size && |
1169 | (count % tape->blk_size) == 0) | |
1170 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1171 | } |
07bd9686 | 1172 | |
88f1b941 | 1173 | rc = idetape_init_rw(drive, IDETAPE_DIR_READ); |
8d06bfad | 1174 | if (rc < 0) |
1da177e4 | 1175 | return rc; |
07bd9686 TH |
1176 | |
1177 | while (done < count) { | |
1178 | size_t todo; | |
1179 | ||
1180 | /* refill if staging buffer is empty */ | |
1181 | if (!tape->valid) { | |
1182 | /* If we are at a filemark, nothing more to read */ | |
49d8078a BP |
1183 | if (test_bit(ilog2(IDE_AFLAG_FILEMARK), |
1184 | &drive->atapi_flags)) | |
07bd9686 TH |
1185 | break; |
1186 | /* read */ | |
1187 | if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, | |
1188 | tape->buffer_size) <= 0) | |
1189 | break; | |
1190 | } | |
1191 | ||
1192 | /* copy out */ | |
1193 | todo = min_t(size_t, count - done, tape->valid); | |
1194 | if (copy_to_user(buf + done, tape->cur, todo)) | |
dcd96379 | 1195 | ret = -EFAULT; |
07bd9686 TH |
1196 | |
1197 | tape->cur += todo; | |
1198 | tape->valid -= todo; | |
1199 | done += todo; | |
1da177e4 | 1200 | } |
07bd9686 | 1201 | |
49d8078a | 1202 | if (!done && test_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags)) { |
8004a8c9 BP |
1203 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1204 | ||
1da177e4 LT |
1205 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1206 | return 0; | |
1207 | } | |
dcd96379 | 1208 | |
07bd9686 | 1209 | return ret ? ret : done; |
1da177e4 LT |
1210 | } |
1211 | ||
5a04cfa9 | 1212 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1213 | size_t count, loff_t *ppos) |
1214 | { | |
5aeddf90 | 1215 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1216 | ide_drive_t *drive = tape->drive; |
07bd9686 | 1217 | size_t done = 0; |
dcd96379 | 1218 | ssize_t ret = 0; |
88f1b941 | 1219 | int rc; |
1da177e4 LT |
1220 | |
1221 | /* The drive is write protected. */ | |
1222 | if (tape->write_prot) | |
1223 | return -EACCES; | |
1224 | ||
8004a8c9 | 1225 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1226 | |
1227 | /* Initialize write operation */ | |
88f1b941 TH |
1228 | rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); |
1229 | if (rc < 0) | |
1230 | return rc; | |
07bd9686 TH |
1231 | |
1232 | while (done < count) { | |
1233 | size_t todo; | |
1234 | ||
1235 | /* flush if staging buffer is full */ | |
1236 | if (tape->valid == tape->buffer_size && | |
1237 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, | |
1238 | tape->buffer_size) <= 0) | |
1239 | return rc; | |
1240 | ||
1241 | /* copy in */ | |
1242 | todo = min_t(size_t, count - done, | |
1243 | tape->buffer_size - tape->valid); | |
1244 | if (copy_from_user(tape->cur, buf + done, todo)) | |
dcd96379 | 1245 | ret = -EFAULT; |
07bd9686 TH |
1246 | |
1247 | tape->cur += todo; | |
1248 | tape->valid += todo; | |
1249 | done += todo; | |
1da177e4 | 1250 | } |
07bd9686 TH |
1251 | |
1252 | return ret ? ret : done; | |
1da177e4 LT |
1253 | } |
1254 | ||
5a04cfa9 | 1255 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1256 | { |
2ac07d92 | 1257 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1258 | struct ide_atapi_pc pc; |
1da177e4 LT |
1259 | |
1260 | /* Write a filemark */ | |
1261 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
2ac07d92 | 1262 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
1da177e4 LT |
1263 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
1264 | return -EIO; | |
1265 | } | |
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | /* | |
d99c9da2 BP |
1270 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1271 | * requested. | |
1da177e4 | 1272 | * |
d99c9da2 BP |
1273 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1274 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1275 | * usually not supported. |
1da177e4 | 1276 | * |
d99c9da2 | 1277 | * The following commands are currently not supported: |
1da177e4 | 1278 | * |
d99c9da2 BP |
1279 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1280 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1281 | */ |
d99c9da2 | 1282 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1283 | { |
1284 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1285 | struct gendisk *disk = tape->disk; |
d236d74c | 1286 | struct ide_atapi_pc pc; |
5a04cfa9 | 1287 | int i, retval; |
1da177e4 | 1288 | |
8004a8c9 BP |
1289 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
1290 | mt_op, mt_count); | |
5a04cfa9 | 1291 | |
1da177e4 | 1292 | switch (mt_op) { |
5a04cfa9 BP |
1293 | case MTFSF: |
1294 | case MTFSFM: | |
1295 | case MTBSF: | |
1296 | case MTBSFM: | |
1297 | if (!mt_count) | |
1298 | return 0; | |
1299 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1300 | default: | |
1301 | break; | |
1da177e4 | 1302 | } |
5a04cfa9 | 1303 | |
1da177e4 | 1304 | switch (mt_op) { |
5a04cfa9 BP |
1305 | case MTWEOF: |
1306 | if (tape->write_prot) | |
1307 | return -EACCES; | |
ec0fdb01 | 1308 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1309 | for (i = 0; i < mt_count; i++) { |
1310 | retval = idetape_write_filemark(drive); | |
1311 | if (retval) | |
1312 | return retval; | |
1313 | } | |
1314 | return 0; | |
1315 | case MTREW: | |
ec0fdb01 | 1316 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1317 | if (idetape_rewind_tape(drive)) |
1318 | return -EIO; | |
1319 | return 0; | |
1320 | case MTLOAD: | |
ec0fdb01 | 1321 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1322 | return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1323 | case MTUNLOAD: |
1324 | case MTOFFL: | |
1325 | /* | |
1326 | * If door is locked, attempt to unlock before | |
1327 | * attempting to eject. | |
1328 | */ | |
1329 | if (tape->door_locked) { | |
0578042d | 1330 | if (!ide_set_media_lock(drive, disk, 0)) |
385a4b87 | 1331 | tape->door_locked = DOOR_UNLOCKED; |
5a04cfa9 | 1332 | } |
ec0fdb01 | 1333 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1334 | retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); |
5a04cfa9 | 1335 | if (!retval) |
49d8078a BP |
1336 | clear_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), |
1337 | &drive->atapi_flags); | |
5a04cfa9 BP |
1338 | return retval; |
1339 | case MTNOP: | |
ec0fdb01 | 1340 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1341 | return idetape_flush_tape_buffers(drive); |
1342 | case MTRETEN: | |
ec0fdb01 | 1343 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1344 | return ide_do_start_stop(drive, disk, |
5a04cfa9 | 1345 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1346 | case MTEOM: |
1347 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
2ac07d92 | 1348 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1349 | case MTERASE: |
1350 | (void)idetape_rewind_tape(drive); | |
1351 | idetape_create_erase_cmd(&pc); | |
2ac07d92 | 1352 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1353 | case MTSETBLK: |
1354 | if (mt_count) { | |
1355 | if (mt_count < tape->blk_size || | |
1356 | mt_count % tape->blk_size) | |
1da177e4 | 1357 | return -EIO; |
5a04cfa9 | 1358 | tape->user_bs_factor = mt_count / tape->blk_size; |
49d8078a BP |
1359 | clear_bit(ilog2(IDE_AFLAG_DETECT_BS), |
1360 | &drive->atapi_flags); | |
5a04cfa9 | 1361 | } else |
49d8078a BP |
1362 | set_bit(ilog2(IDE_AFLAG_DETECT_BS), |
1363 | &drive->atapi_flags); | |
5a04cfa9 BP |
1364 | return 0; |
1365 | case MTSEEK: | |
ec0fdb01 | 1366 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1367 | return idetape_position_tape(drive, |
1368 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1369 | case MTSETPART: | |
ec0fdb01 | 1370 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1371 | return idetape_position_tape(drive, 0, mt_count, 0); |
1372 | case MTFSR: | |
1373 | case MTBSR: | |
1374 | case MTLOCK: | |
0578042d | 1375 | retval = ide_set_media_lock(drive, disk, 1); |
5a04cfa9 | 1376 | if (retval) |
1da177e4 | 1377 | return retval; |
5a04cfa9 BP |
1378 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1379 | return 0; | |
1380 | case MTUNLOCK: | |
0578042d | 1381 | retval = ide_set_media_lock(drive, disk, 0); |
5a04cfa9 BP |
1382 | if (retval) |
1383 | return retval; | |
1384 | tape->door_locked = DOOR_UNLOCKED; | |
1385 | return 0; | |
1386 | default: | |
1387 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1388 | mt_op); | |
1389 | return -EIO; | |
1da177e4 LT |
1390 | } |
1391 | } | |
1392 | ||
1393 | /* | |
d99c9da2 BP |
1394 | * Our character device ioctls. General mtio.h magnetic io commands are |
1395 | * supported here, and not in the corresponding block interface. Our own | |
1396 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 1397 | */ |
d99c9da2 BP |
1398 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
1399 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1400 | { |
5aeddf90 | 1401 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 LT |
1402 | ide_drive_t *drive = tape->drive; |
1403 | struct mtop mtop; | |
1404 | struct mtget mtget; | |
1405 | struct mtpos mtpos; | |
54bb2074 | 1406 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
1407 | void __user *argp = (void __user *)arg; |
1408 | ||
8004a8c9 | 1409 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 1410 | |
54abf37e | 1411 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 1412 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1413 | idetape_flush_tape_buffers(drive); |
1414 | } | |
1415 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
963da55c | 1416 | block_offset = tape->valid / |
54bb2074 | 1417 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
1418 | position = idetape_read_position(drive); |
1419 | if (position < 0) | |
1da177e4 LT |
1420 | return -EIO; |
1421 | } | |
1422 | switch (cmd) { | |
5a04cfa9 BP |
1423 | case MTIOCTOP: |
1424 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
1425 | return -EFAULT; | |
1426 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
1427 | case MTIOCGET: | |
1428 | memset(&mtget, 0, sizeof(struct mtget)); | |
1429 | mtget.mt_type = MT_ISSCSI2; | |
1430 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1431 | mtget.mt_dsreg = | |
1432 | ((tape->blk_size * tape->user_bs_factor) | |
1433 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
1434 | ||
1435 | if (tape->drv_write_prot) | |
1436 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
1437 | ||
1438 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
1439 | return -EFAULT; | |
1440 | return 0; | |
1441 | case MTIOCPOS: | |
1442 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1443 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
1444 | return -EFAULT; | |
1445 | return 0; | |
1446 | default: | |
1447 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1448 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 1449 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
1450 | } |
1451 | } | |
1452 | ||
3cffb9ce BP |
1453 | /* |
1454 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
1455 | * block size with the reported value. | |
1456 | */ | |
1457 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
1458 | { | |
1459 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1460 | struct ide_atapi_pc pc; |
3cffb9ce BP |
1461 | |
1462 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2ac07d92 | 1463 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
3cffb9ce | 1464 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
54bb2074 | 1465 | if (tape->blk_size == 0) { |
3cffb9ce BP |
1466 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
1467 | "block size, assuming 32k\n"); | |
54bb2074 | 1468 | tape->blk_size = 32768; |
3cffb9ce BP |
1469 | } |
1470 | return; | |
1471 | } | |
d236d74c BP |
1472 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
1473 | (pc.buf[4 + 6] << 8) + | |
1474 | pc.buf[4 + 7]; | |
1475 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 1476 | } |
1da177e4 | 1477 | |
5a04cfa9 | 1478 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
1479 | { |
1480 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
1481 | ide_drive_t *drive; | |
1482 | idetape_tape_t *tape; | |
1da177e4 LT |
1483 | int retval; |
1484 | ||
8004a8c9 BP |
1485 | if (i >= MAX_HWIFS * MAX_DRIVES) |
1486 | return -ENXIO; | |
1487 | ||
04f4ac9d | 1488 | lock_kernel(); |
9d01e4cd | 1489 | tape = ide_tape_get(NULL, true, i); |
04f4ac9d JC |
1490 | if (!tape) { |
1491 | unlock_kernel(); | |
8004a8c9 | 1492 | return -ENXIO; |
04f4ac9d | 1493 | } |
8004a8c9 BP |
1494 | |
1495 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1496 | ||
1da177e4 LT |
1497 | /* |
1498 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1499 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1500 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1501 | */ | |
1502 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1503 | ||
1da177e4 LT |
1504 | drive = tape->drive; |
1505 | ||
1506 | filp->private_data = tape; | |
1507 | ||
49d8078a | 1508 | if (test_and_set_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags)) { |
1da177e4 LT |
1509 | retval = -EBUSY; |
1510 | goto out_put_tape; | |
1511 | } | |
1512 | ||
1513 | retval = idetape_wait_ready(drive, 60 * HZ); | |
1514 | if (retval) { | |
49d8078a | 1515 | clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); |
1da177e4 LT |
1516 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
1517 | goto out_put_tape; | |
1518 | } | |
1519 | ||
1520 | idetape_read_position(drive); | |
49d8078a | 1521 | if (!test_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), &drive->atapi_flags)) |
1da177e4 LT |
1522 | (void)idetape_rewind_tape(drive); |
1523 | ||
1da177e4 | 1524 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 1525 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
1526 | |
1527 | /* Set write protect flag if device is opened as read-only. */ | |
1528 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
1529 | tape->write_prot = 1; | |
1530 | else | |
1531 | tape->write_prot = tape->drv_write_prot; | |
1532 | ||
1533 | /* Make sure drive isn't write protected if user wants to write. */ | |
1534 | if (tape->write_prot) { | |
1535 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
1536 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
49d8078a | 1537 | clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); |
1da177e4 LT |
1538 | retval = -EROFS; |
1539 | goto out_put_tape; | |
1540 | } | |
1541 | } | |
1542 | ||
3c98bf34 | 1543 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 1544 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
0578042d | 1545 | if (!ide_set_media_lock(drive, tape->disk, 1)) { |
385a4b87 BZ |
1546 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
1547 | tape->door_locked = DOOR_LOCKED; | |
1da177e4 LT |
1548 | } |
1549 | } | |
04f4ac9d | 1550 | unlock_kernel(); |
1da177e4 LT |
1551 | return 0; |
1552 | ||
1553 | out_put_tape: | |
1554 | ide_tape_put(tape); | |
04f4ac9d | 1555 | unlock_kernel(); |
1da177e4 LT |
1556 | return retval; |
1557 | } | |
1558 | ||
5a04cfa9 | 1559 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
1560 | { |
1561 | idetape_tape_t *tape = drive->driver_data; | |
1562 | ||
d9df937a | 1563 | ide_tape_flush_merge_buffer(drive); |
963da55c TH |
1564 | tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); |
1565 | if (tape->buf != NULL) { | |
54bb2074 BP |
1566 | idetape_pad_zeros(drive, tape->blk_size * |
1567 | (tape->user_bs_factor - 1)); | |
963da55c TH |
1568 | kfree(tape->buf); |
1569 | tape->buf = NULL; | |
1da177e4 LT |
1570 | } |
1571 | idetape_write_filemark(drive); | |
1572 | idetape_flush_tape_buffers(drive); | |
1573 | idetape_flush_tape_buffers(drive); | |
1574 | } | |
1575 | ||
5a04cfa9 | 1576 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 | 1577 | { |
5aeddf90 | 1578 | struct ide_tape_obj *tape = filp->private_data; |
1da177e4 | 1579 | ide_drive_t *drive = tape->drive; |
1da177e4 LT |
1580 | unsigned int minor = iminor(inode); |
1581 | ||
1582 | lock_kernel(); | |
1583 | tape = drive->driver_data; | |
8004a8c9 BP |
1584 | |
1585 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 1586 | |
54abf37e | 1587 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 1588 | idetape_write_release(drive, minor); |
54abf37e | 1589 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 1590 | if (minor < 128) |
ec0fdb01 | 1591 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 1592 | } |
f64eee7b | 1593 | |
49d8078a BP |
1594 | if (minor < 128 && test_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), |
1595 | &drive->atapi_flags)) | |
1da177e4 | 1596 | (void) idetape_rewind_tape(drive); |
49d8078a | 1597 | |
54abf37e | 1598 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 | 1599 | if (tape->door_locked == DOOR_LOCKED) { |
0578042d | 1600 | if (!ide_set_media_lock(drive, tape->disk, 0)) |
385a4b87 | 1601 | tape->door_locked = DOOR_UNLOCKED; |
1da177e4 LT |
1602 | } |
1603 | } | |
49d8078a | 1604 | clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); |
1da177e4 LT |
1605 | ide_tape_put(tape); |
1606 | unlock_kernel(); | |
1607 | return 0; | |
1608 | } | |
1609 | ||
6d29c8f0 | 1610 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 1611 | { |
1da177e4 | 1612 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 1613 | struct ide_atapi_pc pc; |
41fa9f86 | 1614 | u8 pc_buf[256]; |
801bd32e | 1615 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 1616 | |
1da177e4 | 1617 | idetape_create_inquiry_cmd(&pc); |
41fa9f86 BZ |
1618 | pc.buf = &pc_buf[0]; |
1619 | pc.buf_size = sizeof(pc_buf); | |
1620 | ||
2ac07d92 | 1621 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
6d29c8f0 BP |
1622 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
1623 | tape->name); | |
1da177e4 LT |
1624 | return; |
1625 | } | |
d236d74c BP |
1626 | memcpy(vendor_id, &pc.buf[8], 8); |
1627 | memcpy(product_id, &pc.buf[16], 16); | |
1628 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 | 1629 | |
801bd32e BP |
1630 | ide_fixstring(vendor_id, 8, 0); |
1631 | ide_fixstring(product_id, 16, 0); | |
1632 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 1633 | |
801bd32e | 1634 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 1635 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
1636 | } |
1637 | ||
1638 | /* | |
b6422013 BP |
1639 | * Ask the tape about its various parameters. In particular, we will adjust our |
1640 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 1641 | */ |
5a04cfa9 | 1642 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
1643 | { |
1644 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1645 | struct ide_atapi_pc pc; |
b6422013 BP |
1646 | u8 *caps; |
1647 | u8 speed, max_speed; | |
47314fa4 | 1648 | |
1da177e4 | 1649 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2ac07d92 | 1650 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
b6422013 BP |
1651 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
1652 | " some default values\n"); | |
54bb2074 | 1653 | tape->blk_size = 512; |
b6422013 BP |
1654 | put_unaligned(52, (u16 *)&tape->caps[12]); |
1655 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
1656 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
1657 | return; |
1658 | } | |
d236d74c | 1659 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
1660 | |
1661 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
1662 | speed = be16_to_cpup((__be16 *)&caps[14]); |
1663 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 1664 | |
cd740ab0 HH |
1665 | *(u16 *)&caps[8] = max_speed; |
1666 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
1667 | *(u16 *)&caps[14] = speed; | |
1668 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 1669 | |
b6422013 BP |
1670 | if (!speed) { |
1671 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
1672 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 1673 | *(u16 *)&caps[14] = 650; |
1da177e4 | 1674 | } |
b6422013 BP |
1675 | if (!max_speed) { |
1676 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
1677 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 1678 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
1679 | } |
1680 | ||
b6422013 | 1681 | memcpy(&tape->caps, caps, 20); |
0578042d BZ |
1682 | |
1683 | /* device lacks locking support according to capabilities page */ | |
1684 | if ((caps[6] & 1) == 0) | |
42619d35 | 1685 | drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; |
0578042d | 1686 | |
b6422013 | 1687 | if (caps[7] & 0x02) |
54bb2074 | 1688 | tape->blk_size = 512; |
b6422013 | 1689 | else if (caps[7] & 0x04) |
54bb2074 | 1690 | tape->blk_size = 1024; |
1da177e4 LT |
1691 | } |
1692 | ||
7662d046 | 1693 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
1694 | #define ide_tape_devset_get(name, field) \ |
1695 | static int get_##name(ide_drive_t *drive) \ | |
1696 | { \ | |
1697 | idetape_tape_t *tape = drive->driver_data; \ | |
1698 | return tape->field; \ | |
1699 | } | |
1700 | ||
1701 | #define ide_tape_devset_set(name, field) \ | |
1702 | static int set_##name(ide_drive_t *drive, int arg) \ | |
1703 | { \ | |
1704 | idetape_tape_t *tape = drive->driver_data; \ | |
1705 | tape->field = arg; \ | |
1706 | return 0; \ | |
1707 | } | |
1708 | ||
92f1f8fd | 1709 | #define ide_tape_devset_rw_field(_name, _field) \ |
8185d5aa BZ |
1710 | ide_tape_devset_get(_name, _field) \ |
1711 | ide_tape_devset_set(_name, _field) \ | |
92f1f8fd | 1712 | IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) |
8185d5aa | 1713 | |
92f1f8fd | 1714 | #define ide_tape_devset_r_field(_name, _field) \ |
8185d5aa | 1715 | ide_tape_devset_get(_name, _field) \ |
92f1f8fd | 1716 | IDE_DEVSET(_name, 0, get_##_name, NULL) |
8185d5aa BZ |
1717 | |
1718 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
1719 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
1720 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
1721 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
1722 | ||
97100fc8 | 1723 | ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); |
92f1f8fd EO |
1724 | |
1725 | ide_tape_devset_rw_field(debug_mask, debug_mask); | |
1726 | ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); | |
1727 | ||
1728 | ide_tape_devset_r_field(avg_speed, avg_speed); | |
1729 | ide_tape_devset_r_field(speed, caps[14]); | |
1730 | ide_tape_devset_r_field(buffer, caps[16]); | |
1731 | ide_tape_devset_r_field(buffer_size, buffer_size); | |
1732 | ||
1733 | static const struct ide_proc_devset idetape_settings[] = { | |
1734 | __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), | |
1735 | __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), | |
1736 | __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), | |
1737 | __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), | |
1738 | __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), | |
1739 | __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), | |
1740 | __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
1741 | mulf_tdsc, divf_tdsc), | |
71bfc7a7 | 1742 | { NULL }, |
8185d5aa | 1743 | }; |
7662d046 | 1744 | #endif |
1da177e4 LT |
1745 | |
1746 | /* | |
3c98bf34 | 1747 | * The function below is called to: |
1da177e4 | 1748 | * |
3c98bf34 BP |
1749 | * 1. Initialize our various state variables. |
1750 | * 2. Ask the tape for its capabilities. | |
1751 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
1752 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 1753 | * |
3c98bf34 BP |
1754 | * Note that at this point ide.c already assigned us an irq, so that we can |
1755 | * queue requests here and wait for their completion. | |
1da177e4 | 1756 | */ |
5a04cfa9 | 1757 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 1758 | { |
83042b24 | 1759 | unsigned long t; |
1da177e4 | 1760 | int speed; |
f73850a3 | 1761 | int buffer_size; |
b6422013 | 1762 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 1763 | |
85e39035 | 1764 | drive->pc_callback = ide_tape_callback; |
776bb027 | 1765 | |
97100fc8 BZ |
1766 | drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; |
1767 | ||
4166c199 BZ |
1768 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
1769 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
1770 | tape->name); | |
97100fc8 | 1771 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 1772 | } |
97100fc8 | 1773 | |
1da177e4 | 1774 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 1775 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
97100fc8 BZ |
1776 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1777 | ||
1da177e4 LT |
1778 | tape->minor = minor; |
1779 | tape->name[0] = 'h'; | |
1780 | tape->name[1] = 't'; | |
1781 | tape->name[2] = '0' + minor; | |
54abf37e | 1782 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
4dde4492 | 1783 | |
1da177e4 LT |
1784 | idetape_get_inquiry_results(drive); |
1785 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 1786 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 1787 | tape->user_bs_factor = 1; |
f73850a3 BP |
1788 | tape->buffer_size = *ctl * tape->blk_size; |
1789 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 1790 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 1791 | *ctl /= 2; |
f73850a3 | 1792 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 1793 | } |
f73850a3 | 1794 | buffer_size = tape->buffer_size; |
1da177e4 | 1795 | |
83042b24 | 1796 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 1797 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 1798 | |
f73850a3 | 1799 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
1800 | |
1801 | /* | |
3c98bf34 BP |
1802 | * Ensure that the number we got makes sense; limit it within |
1803 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 1804 | */ |
a792bd5a HH |
1805 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
1806 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 1807 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 1808 | "%lums tDSC%s\n", |
b6422013 | 1809 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
1810 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
1811 | tape->buffer_size / 1024, | |
54bb2074 | 1812 | tape->best_dsc_rw_freq * 1000 / HZ, |
97100fc8 | 1813 | (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); |
1da177e4 | 1814 | |
1e874f44 | 1815 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
1816 | } |
1817 | ||
4031bbe4 | 1818 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
1819 | { |
1820 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1821 | |
7662d046 | 1822 | ide_proc_unregister_driver(drive, tape->driver); |
8fed4368 | 1823 | device_del(&tape->dev); |
1da177e4 LT |
1824 | ide_unregister_region(tape->disk); |
1825 | ||
8fed4368 BZ |
1826 | mutex_lock(&idetape_ref_mutex); |
1827 | put_device(&tape->dev); | |
1828 | mutex_unlock(&idetape_ref_mutex); | |
1da177e4 LT |
1829 | } |
1830 | ||
8fed4368 | 1831 | static void ide_tape_release(struct device *dev) |
1da177e4 | 1832 | { |
8fed4368 | 1833 | struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); |
1da177e4 LT |
1834 | ide_drive_t *drive = tape->drive; |
1835 | struct gendisk *g = tape->disk; | |
1836 | ||
963da55c | 1837 | BUG_ON(tape->valid); |
8604affd | 1838 | |
97100fc8 | 1839 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 1840 | drive->driver_data = NULL; |
dbc1272e | 1841 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
1842 | device_destroy(idetape_sysfs_class, |
1843 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
1844 | idetape_devs[tape->minor] = NULL; |
1845 | g->private_data = NULL; | |
1846 | put_disk(g); | |
1847 | kfree(tape); | |
1848 | } | |
1849 | ||
ecfd80e4 | 1850 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
1851 | static int proc_idetape_read_name |
1852 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
1853 | { | |
1854 | ide_drive_t *drive = (ide_drive_t *) data; | |
1855 | idetape_tape_t *tape = drive->driver_data; | |
1856 | char *out = page; | |
1857 | int len; | |
1858 | ||
1859 | len = sprintf(out, "%s\n", tape->name); | |
1860 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
1861 | } | |
1862 | ||
1863 | static ide_proc_entry_t idetape_proc[] = { | |
1864 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
1865 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
1866 | { NULL, 0, NULL, NULL } | |
1867 | }; | |
79cb3803 BZ |
1868 | |
1869 | static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) | |
1870 | { | |
1871 | return idetape_proc; | |
1872 | } | |
1873 | ||
1874 | static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) | |
1875 | { | |
1876 | return idetape_settings; | |
1877 | } | |
1da177e4 LT |
1878 | #endif |
1879 | ||
4031bbe4 | 1880 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 1881 | |
7f3c868b | 1882 | static struct ide_driver idetape_driver = { |
8604affd | 1883 | .gen_driver = { |
4ef3b8f4 | 1884 | .owner = THIS_MODULE, |
8604affd BZ |
1885 | .name = "ide-tape", |
1886 | .bus = &ide_bus_type, | |
8604affd | 1887 | }, |
4031bbe4 RK |
1888 | .probe = ide_tape_probe, |
1889 | .remove = ide_tape_remove, | |
1da177e4 | 1890 | .version = IDETAPE_VERSION, |
1da177e4 | 1891 | .do_request = idetape_do_request, |
7662d046 | 1892 | #ifdef CONFIG_IDE_PROC_FS |
79cb3803 BZ |
1893 | .proc_entries = ide_tape_proc_entries, |
1894 | .proc_devsets = ide_tape_proc_devsets, | |
7662d046 | 1895 | #endif |
1da177e4 LT |
1896 | }; |
1897 | ||
3c98bf34 | 1898 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 1899 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
1900 | .owner = THIS_MODULE, |
1901 | .read = idetape_chrdev_read, | |
1902 | .write = idetape_chrdev_write, | |
1903 | .ioctl = idetape_chrdev_ioctl, | |
1904 | .open = idetape_chrdev_open, | |
1905 | .release = idetape_chrdev_release, | |
1906 | }; | |
1907 | ||
a4600f81 | 1908 | static int idetape_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 1909 | { |
9d01e4cd | 1910 | struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk, false, 0); |
1da177e4 | 1911 | |
5a04cfa9 | 1912 | if (!tape) |
1da177e4 LT |
1913 | return -ENXIO; |
1914 | ||
1da177e4 LT |
1915 | return 0; |
1916 | } | |
1917 | ||
a4600f81 | 1918 | static int idetape_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 1919 | { |
5aeddf90 | 1920 | struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); |
1da177e4 LT |
1921 | |
1922 | ide_tape_put(tape); | |
1da177e4 LT |
1923 | return 0; |
1924 | } | |
1925 | ||
a4600f81 | 1926 | static int idetape_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
1927 | unsigned int cmd, unsigned long arg) |
1928 | { | |
5aeddf90 | 1929 | struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); |
1da177e4 | 1930 | ide_drive_t *drive = tape->drive; |
1bddd9e6 | 1931 | int err = generic_ide_ioctl(drive, bdev, cmd, arg); |
1da177e4 LT |
1932 | if (err == -EINVAL) |
1933 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
1934 | return err; | |
1935 | } | |
1936 | ||
1937 | static struct block_device_operations idetape_block_ops = { | |
1938 | .owner = THIS_MODULE, | |
a4600f81 AV |
1939 | .open = idetape_open, |
1940 | .release = idetape_release, | |
1941 | .locked_ioctl = idetape_ioctl, | |
1da177e4 LT |
1942 | }; |
1943 | ||
4031bbe4 | 1944 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
1945 | { |
1946 | idetape_tape_t *tape; | |
1947 | struct gendisk *g; | |
1948 | int minor; | |
1949 | ||
1950 | if (!strstr("ide-tape", drive->driver_req)) | |
1951 | goto failed; | |
2a924662 | 1952 | |
1da177e4 LT |
1953 | if (drive->media != ide_tape) |
1954 | goto failed; | |
2a924662 | 1955 | |
97100fc8 BZ |
1956 | if ((drive->dev_flags & IDE_DFLAG_ID_READ) && |
1957 | ide_check_atapi_device(drive, DRV_NAME) == 0) { | |
5a04cfa9 BP |
1958 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
1959 | " the driver\n", drive->name); | |
1da177e4 LT |
1960 | goto failed; |
1961 | } | |
5a04cfa9 | 1962 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 1963 | if (tape == NULL) { |
5a04cfa9 BP |
1964 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
1965 | drive->name); | |
1da177e4 LT |
1966 | goto failed; |
1967 | } | |
1968 | ||
1969 | g = alloc_disk(1 << PARTN_BITS); | |
1970 | if (!g) | |
1971 | goto out_free_tape; | |
1972 | ||
1973 | ide_init_disk(g, drive); | |
1974 | ||
8fed4368 BZ |
1975 | tape->dev.parent = &drive->gendev; |
1976 | tape->dev.release = ide_tape_release; | |
1977 | dev_set_name(&tape->dev, dev_name(&drive->gendev)); | |
1978 | ||
1979 | if (device_register(&tape->dev)) | |
1980 | goto out_free_disk; | |
1da177e4 LT |
1981 | |
1982 | tape->drive = drive; | |
1983 | tape->driver = &idetape_driver; | |
1984 | tape->disk = g; | |
1985 | ||
1986 | g->private_data = &tape->driver; | |
1987 | ||
1988 | drive->driver_data = tape; | |
1989 | ||
cf8b8975 | 1990 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
1991 | for (minor = 0; idetape_devs[minor]; minor++) |
1992 | ; | |
1993 | idetape_devs[minor] = tape; | |
cf8b8975 | 1994 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
1995 | |
1996 | idetape_setup(drive, tape, minor); | |
1997 | ||
3ee074bf GKH |
1998 | device_create(idetape_sysfs_class, &drive->gendev, |
1999 | MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); | |
2000 | device_create(idetape_sysfs_class, &drive->gendev, | |
2001 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
2002 | "n%s", tape->name); | |
d5dee80a | 2003 | |
1da177e4 LT |
2004 | g->fops = &idetape_block_ops; |
2005 | ide_register_region(g); | |
2006 | ||
2007 | return 0; | |
8604affd | 2008 | |
8fed4368 BZ |
2009 | out_free_disk: |
2010 | put_disk(g); | |
1da177e4 LT |
2011 | out_free_tape: |
2012 | kfree(tape); | |
2013 | failed: | |
8604affd | 2014 | return -ENODEV; |
1da177e4 LT |
2015 | } |
2016 | ||
5a04cfa9 | 2017 | static void __exit idetape_exit(void) |
1da177e4 | 2018 | { |
8604affd | 2019 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2020 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2021 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2022 | } | |
2023 | ||
17514e8a | 2024 | static int __init idetape_init(void) |
1da177e4 | 2025 | { |
d5dee80a WD |
2026 | int error = 1; |
2027 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2028 | if (IS_ERR(idetape_sysfs_class)) { | |
2029 | idetape_sysfs_class = NULL; | |
2030 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2031 | error = -EBUSY; | |
2032 | goto out; | |
2033 | } | |
2034 | ||
1da177e4 | 2035 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2036 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2037 | " interface\n"); | |
d5dee80a WD |
2038 | error = -EBUSY; |
2039 | goto out_free_class; | |
1da177e4 | 2040 | } |
d5dee80a WD |
2041 | |
2042 | error = driver_register(&idetape_driver.gen_driver); | |
2043 | if (error) | |
2044 | goto out_free_driver; | |
2045 | ||
2046 | return 0; | |
2047 | ||
2048 | out_free_driver: | |
2049 | driver_unregister(&idetape_driver.gen_driver); | |
2050 | out_free_class: | |
2051 | class_destroy(idetape_sysfs_class); | |
2052 | out: | |
2053 | return error; | |
1da177e4 LT |
2054 | } |
2055 | ||
263756ec | 2056 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2057 | module_init(idetape_init); |
2058 | module_exit(idetape_exit); | |
2059 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2060 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2061 | MODULE_LICENSE("GPL"); |