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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 | |
1da177e4 LT |
243 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
244 | { | |
245 | struct ide_tape_obj *tape = NULL; | |
246 | ||
cf8b8975 | 247 | mutex_lock(&idetape_ref_mutex); |
5aeddf90 | 248 | tape = ide_drv_g(disk, ide_tape_obj); |
08da591e | 249 | if (tape) { |
d3e33ff5 | 250 | if (ide_device_get(tape->drive)) |
08da591e | 251 | tape = NULL; |
d3e33ff5 | 252 | else |
8fed4368 | 253 | get_device(&tape->dev); |
08da591e | 254 | } |
cf8b8975 | 255 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
256 | return tape; |
257 | } | |
258 | ||
1da177e4 LT |
259 | static void ide_tape_put(struct ide_tape_obj *tape) |
260 | { | |
d3e33ff5 BZ |
261 | ide_drive_t *drive = tape->drive; |
262 | ||
cf8b8975 | 263 | mutex_lock(&idetape_ref_mutex); |
8fed4368 | 264 | put_device(&tape->dev); |
d3e33ff5 | 265 | ide_device_put(drive); |
cf8b8975 | 266 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
267 | } |
268 | ||
1da177e4 | 269 | /* |
3c98bf34 BP |
270 | * The variables below are used for the character device interface. Additional |
271 | * state variables are defined in our ide_drive_t structure. | |
1da177e4 | 272 | */ |
5a04cfa9 | 273 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
1da177e4 | 274 | |
1da177e4 LT |
275 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) |
276 | { | |
277 | struct ide_tape_obj *tape = NULL; | |
278 | ||
cf8b8975 | 279 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
280 | tape = idetape_devs[i]; |
281 | if (tape) | |
8fed4368 | 282 | get_device(&tape->dev); |
cf8b8975 | 283 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
284 | return tape; |
285 | } | |
286 | ||
1da177e4 | 287 | /* |
1b5db434 BP |
288 | * called on each failed packet command retry to analyze the request sense. We |
289 | * currently do not utilize this information. | |
1da177e4 | 290 | */ |
1b5db434 | 291 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
292 | { |
293 | idetape_tape_t *tape = drive->driver_data; | |
5e2040fd | 294 | struct ide_atapi_pc *pc = drive->failed_pc; |
1da177e4 | 295 | |
1b5db434 BP |
296 | tape->sense_key = sense[2] & 0xF; |
297 | tape->asc = sense[12]; | |
298 | tape->ascq = sense[13]; | |
8004a8c9 BP |
299 | |
300 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
301 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 302 | |
d236d74c | 303 | /* Correct pc->xferred by asking the tape. */ |
21d9c5d2 | 304 | if (pc->flags & PC_FLAG_DMA_ERROR) |
d236d74c | 305 | pc->xferred = pc->req_xfer - |
54bb2074 | 306 | tape->blk_size * |
5d0cc8ae | 307 | get_unaligned_be32(&sense[3]); |
1da177e4 LT |
308 | |
309 | /* | |
310 | * If error was the result of a zero-length read or write command, | |
311 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
312 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
313 | */ | |
90699ce2 | 314 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
315 | /* length == 0 */ |
316 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
317 | if (tape->sense_key == 5) { | |
1da177e4 LT |
318 | /* don't report an error, everything's ok */ |
319 | pc->error = 0; | |
320 | /* don't retry read/write */ | |
346331f8 | 321 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
322 | } |
323 | } | |
90699ce2 | 324 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
c152cc1a | 325 | pc->error = IDE_DRV_ERROR_FILEMARK; |
346331f8 | 326 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 327 | } |
90699ce2 | 328 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
329 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
330 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
c152cc1a | 331 | pc->error = IDE_DRV_ERROR_EOD; |
346331f8 | 332 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
333 | } |
334 | } | |
90699ce2 | 335 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 336 | if (tape->sense_key == 8) { |
c152cc1a | 337 | pc->error = IDE_DRV_ERROR_EOD; |
346331f8 | 338 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 339 | } |
346331f8 | 340 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 341 | pc->xferred) |
1da177e4 LT |
342 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
343 | } | |
344 | } | |
345 | ||
b14c7212 BZ |
346 | static void ide_tape_handle_dsc(ide_drive_t *); |
347 | ||
03a2faae | 348 | static int ide_tape_callback(ide_drive_t *drive, int dsc) |
1da177e4 LT |
349 | { |
350 | idetape_tape_t *tape = drive->driver_data; | |
2b9efba4 | 351 | struct ide_atapi_pc *pc = drive->pc; |
313afea7 | 352 | struct request *rq = drive->hwif->rq; |
5985e6ab | 353 | int uptodate = pc->error ? 0 : 1; |
313afea7 | 354 | int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; |
1da177e4 | 355 | |
8004a8c9 BP |
356 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
357 | ||
b14c7212 BZ |
358 | if (dsc) |
359 | ide_tape_handle_dsc(drive); | |
360 | ||
5e2040fd BZ |
361 | if (drive->failed_pc == pc) |
362 | drive->failed_pc = NULL; | |
dd2e9a03 | 363 | |
5985e6ab BZ |
364 | if (pc->c[0] == REQUEST_SENSE) { |
365 | if (uptodate) | |
366 | idetape_analyze_error(drive, pc->buf); | |
367 | else | |
368 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
369 | "itself - Aborting request!\n"); | |
370 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
5985e6ab BZ |
371 | int blocks = pc->xferred / tape->blk_size; |
372 | ||
373 | tape->avg_size += blocks * tape->blk_size; | |
374 | ||
375 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
376 | tape->avg_speed = tape->avg_size * HZ / | |
377 | (jiffies - tape->avg_time) / 1024; | |
378 | tape->avg_size = 0; | |
379 | tape->avg_time = jiffies; | |
380 | } | |
381 | ||
382 | tape->first_frame += blocks; | |
21d9c5d2 | 383 | rq->data_len -= blocks * tape->blk_size; |
5985e6ab | 384 | |
313afea7 BZ |
385 | if (pc->error) { |
386 | uptodate = 0; | |
387 | err = pc->error; | |
388 | } | |
5985e6ab | 389 | } else if (pc->c[0] == READ_POSITION && uptodate) { |
2b9efba4 | 390 | u8 *readpos = pc->buf; |
5985e6ab BZ |
391 | |
392 | debug_log(DBG_SENSE, "BOP - %s\n", | |
393 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
394 | debug_log(DBG_SENSE, "EOP - %s\n", | |
395 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
396 | ||
397 | if (readpos[0] & 0x4) { | |
398 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
399 | "to the tape\n"); | |
f2e3ab52 | 400 | clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 401 | uptodate = 0; |
313afea7 | 402 | err = IDE_DRV_ERROR_GENERAL; |
5985e6ab BZ |
403 | } else { |
404 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
cd740ab0 | 405 | be32_to_cpup((__be32 *)&readpos[4])); |
5985e6ab BZ |
406 | |
407 | tape->partition = readpos[1]; | |
cd740ab0 | 408 | tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); |
f2e3ab52 | 409 | set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 410 | } |
1da177e4 | 411 | } |
5985e6ab | 412 | |
313afea7 BZ |
413 | rq->errors = err; |
414 | ||
03a2faae | 415 | return uptodate; |
1da177e4 LT |
416 | } |
417 | ||
1da177e4 | 418 | /* |
3c98bf34 | 419 | * Postpone the current request so that ide.c will be able to service requests |
b65fac32 | 420 | * from another device on the same port while we are polling for DSC. |
1da177e4 | 421 | */ |
5a04cfa9 | 422 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
423 | { |
424 | idetape_tape_t *tape = drive->driver_data; | |
425 | ||
8004a8c9 BP |
426 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
427 | ||
b65fac32 BZ |
428 | tape->postponed_rq = drive->hwif->rq; |
429 | ||
54bb2074 | 430 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
431 | } |
432 | ||
74e63e74 BZ |
433 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
434 | { | |
435 | idetape_tape_t *tape = drive->driver_data; | |
436 | ||
437 | /* Media access command */ | |
438 | tape->dsc_polling_start = jiffies; | |
439 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
440 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
441 | /* Allow ide.c to handle other requests */ | |
442 | idetape_postpone_request(drive); | |
443 | } | |
444 | ||
1da177e4 | 445 | /* |
3c98bf34 | 446 | * Packet Command Interface |
1da177e4 | 447 | * |
2b9efba4 | 448 | * The current Packet Command is available in drive->pc, and will not change |
3c98bf34 BP |
449 | * until we finish handling it. Each packet command is associated with a |
450 | * callback function that will be called when the command is finished. | |
1da177e4 | 451 | * |
3c98bf34 | 452 | * The handling will be done in three stages: |
1da177e4 | 453 | * |
b788ee9c | 454 | * 1. ide_tape_issue_pc will send the packet command to the drive, and will set |
aa5d2de7 | 455 | * the interrupt handler to ide_pc_intr. |
1da177e4 | 456 | * |
aa5d2de7 | 457 | * 2. On each interrupt, ide_pc_intr will be called. This step will be |
3c98bf34 | 458 | * repeated until the device signals us that no more interrupts will be issued. |
1da177e4 | 459 | * |
3c98bf34 BP |
460 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
461 | * process. In case of a successful initiation of a media access packet command, | |
462 | * the DSC bit will be set when the actual execution of the command is finished. | |
463 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
464 | * event. In this case, we define the request as "low priority request" by | |
465 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
466 | * exit the driver. | |
1da177e4 | 467 | * |
3c98bf34 BP |
468 | * ide.c will then give higher priority to requests which originate from the |
469 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 470 | * |
3c98bf34 | 471 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 472 | * |
3c98bf34 BP |
473 | * 5. In case an error was found, we queue a request sense packet command in |
474 | * front of the request queue and retry the operation up to | |
475 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 476 | * |
3c98bf34 BP |
477 | * 6. In case no error was found, or we decided to give up and not to retry |
478 | * again, the callback function will be called and then we will handle the next | |
479 | * request. | |
1da177e4 | 480 | */ |
1da177e4 | 481 | |
b788ee9c BZ |
482 | static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, |
483 | struct ide_cmd *cmd, | |
484 | struct ide_atapi_pc *pc) | |
1da177e4 | 485 | { |
1da177e4 | 486 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 487 | |
5e2040fd BZ |
488 | if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
489 | drive->failed_pc = pc; | |
2b9efba4 | 490 | |
1da177e4 | 491 | /* Set the current packet command */ |
2b9efba4 | 492 | drive->pc = pc; |
1da177e4 LT |
493 | |
494 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 495 | (pc->flags & PC_FLAG_ABORT)) { |
b3071d19 TH |
496 | unsigned int done = blk_rq_bytes(drive->hwif->rq); |
497 | ||
1da177e4 | 498 | /* |
3c98bf34 BP |
499 | * We will "abort" retrying a packet command in case legitimate |
500 | * error code was received (crossing a filemark, or end of the | |
501 | * media, for example). | |
1da177e4 | 502 | */ |
346331f8 | 503 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 504 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
505 | tape->sense_key == 2 && tape->asc == 4 && |
506 | (tape->ascq == 1 || tape->ascq == 8))) { | |
507 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
508 | "pc = %2x, key = %2x, " | |
509 | "asc = %2x, ascq = %2x\n", | |
510 | tape->name, pc->c[0], | |
511 | tape->sense_key, tape->asc, | |
512 | tape->ascq); | |
513 | } | |
514 | /* Giving up */ | |
c152cc1a | 515 | pc->error = IDE_DRV_ERROR_GENERAL; |
1da177e4 | 516 | } |
b3071d19 | 517 | |
5e2040fd | 518 | drive->failed_pc = NULL; |
b14c7212 | 519 | drive->pc_callback(drive, 0); |
b3071d19 | 520 | ide_complete_rq(drive, -EIO, done); |
92f5daff | 521 | return ide_stopped; |
1da177e4 | 522 | } |
8004a8c9 | 523 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
524 | |
525 | pc->retries++; | |
1da177e4 | 526 | |
b788ee9c | 527 | return ide_issue_pc(drive, cmd); |
1da177e4 LT |
528 | } |
529 | ||
3c98bf34 | 530 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 531 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 | 532 | { |
7bf7420a | 533 | ide_init_pc(pc); |
90699ce2 | 534 | pc->c[0] = MODE_SENSE; |
1da177e4 | 535 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
536 | /* DBD = 1 - Don't return block descriptors */ |
537 | pc->c[1] = 8; | |
1da177e4 LT |
538 | pc->c[2] = page_code; |
539 | /* | |
540 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
541 | * | |
542 | * For SCSI this byte is defined as subpage instead of high byte | |
543 | * of length and some IDE drives seem to interpret it this way | |
544 | * and return an error when 255 is used. | |
545 | */ | |
546 | pc->c[3] = 0; | |
3c98bf34 BP |
547 | /* We will just discard data in that case */ |
548 | pc->c[4] = 255; | |
1da177e4 | 549 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 550 | pc->req_xfer = 12; |
1da177e4 | 551 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 552 | pc->req_xfer = 24; |
1da177e4 | 553 | else |
d236d74c | 554 | pc->req_xfer = 50; |
1da177e4 LT |
555 | } |
556 | ||
5a04cfa9 | 557 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 558 | { |
b73c7ee2 | 559 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 560 | idetape_tape_t *tape = drive->driver_data; |
2b9efba4 | 561 | struct ide_atapi_pc *pc = drive->pc; |
22c525b9 | 562 | u8 stat; |
1da177e4 | 563 | |
374e042c | 564 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 565 | |
3a7d2484 BZ |
566 | if (stat & ATA_DSC) { |
567 | if (stat & ATA_ERR) { | |
1da177e4 | 568 | /* Error detected */ |
90699ce2 | 569 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
570 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
571 | tape->name); | |
572 | /* Retry operation */ | |
6b544fcc | 573 | ide_retry_pc(drive); |
258ec411 | 574 | return ide_stopped; |
1da177e4 LT |
575 | } |
576 | pc->error = 0; | |
1da177e4 | 577 | } else { |
c152cc1a | 578 | pc->error = IDE_DRV_ERROR_GENERAL; |
5e2040fd | 579 | drive->failed_pc = NULL; |
1da177e4 | 580 | } |
b14c7212 | 581 | drive->pc_callback(drive, 0); |
1da177e4 LT |
582 | return ide_stopped; |
583 | } | |
584 | ||
cd2abbfe | 585 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
586 | struct ide_atapi_pc *pc, struct request *rq, |
587 | u8 opcode) | |
1da177e4 | 588 | { |
963da55c | 589 | unsigned int length = rq->nr_sectors; |
0014c75b | 590 | |
7bf7420a | 591 | ide_init_pc(pc); |
860ff5ec | 592 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 593 | pc->c[1] = 1; |
21d9c5d2 | 594 | pc->bh = NULL; |
d236d74c BP |
595 | pc->buf = NULL; |
596 | pc->buf_size = length * tape->blk_size; | |
597 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 598 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 599 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 600 | |
963da55c | 601 | if (opcode == READ_6) |
cd2abbfe | 602 | pc->c[0] = READ_6; |
963da55c | 603 | else if (opcode == WRITE_6) { |
cd2abbfe BP |
604 | pc->c[0] = WRITE_6; |
605 | pc->flags |= PC_FLAG_WRITING; | |
cd2abbfe | 606 | } |
0014c75b BP |
607 | |
608 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
609 | } |
610 | ||
1da177e4 LT |
611 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
612 | struct request *rq, sector_t block) | |
613 | { | |
b73c7ee2 | 614 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 615 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 616 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 617 | struct request *postponed_rq = tape->postponed_rq; |
b788ee9c | 618 | struct ide_cmd cmd; |
22c525b9 | 619 | u8 stat; |
1da177e4 | 620 | |
963da55c TH |
621 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu\n" |
622 | (unsigned long long)rq->sector, rq->nr_sectors); | |
1da177e4 | 623 | |
6b544fcc | 624 | if (!(blk_special_request(rq) || blk_sense_request(rq))) { |
3c98bf34 | 625 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 626 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 627 | "request queue (%d)\n", drive->name, rq->cmd_type); |
89f78b32 BZ |
628 | if (blk_fs_request(rq) == 0 && rq->errors == 0) |
629 | rq->errors = -EIO; | |
130e8867 | 630 | ide_complete_rq(drive, -EIO, ide_rq_bytes(rq)); |
1da177e4 LT |
631 | return ide_stopped; |
632 | } | |
633 | ||
3c98bf34 | 634 | /* Retry a failed packet command */ |
5e2040fd BZ |
635 | if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { |
636 | pc = drive->failed_pc; | |
28c7214b BZ |
637 | goto out; |
638 | } | |
5a04cfa9 | 639 | |
1da177e4 LT |
640 | if (postponed_rq != NULL) |
641 | if (rq != postponed_rq) { | |
642 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
643 | "Two DSC requests were queued\n"); | |
313afea7 | 644 | drive->failed_pc = NULL; |
6902a533 | 645 | rq->errors = 0; |
f974b196 | 646 | ide_complete_rq(drive, 0, blk_rq_bytes(rq)); |
1da177e4 LT |
647 | return ide_stopped; |
648 | } | |
1da177e4 LT |
649 | |
650 | tape->postponed_rq = NULL; | |
651 | ||
652 | /* | |
653 | * If the tape is still busy, postpone our request and service | |
654 | * the other device meanwhile. | |
655 | */ | |
374e042c | 656 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 657 | |
97100fc8 BZ |
658 | if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && |
659 | (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) | |
f2e3ab52 | 660 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 | 661 | |
97100fc8 | 662 | if (drive->dev_flags & IDE_DFLAG_POST_RESET) { |
f2e3ab52 | 663 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
97100fc8 | 664 | drive->dev_flags &= ~IDE_DFLAG_POST_RESET; |
1da177e4 LT |
665 | } |
666 | ||
f2e3ab52 | 667 | if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && |
3a7d2484 | 668 | (stat & ATA_DSC) == 0) { |
1da177e4 LT |
669 | if (postponed_rq == NULL) { |
670 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 671 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
672 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
673 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
674 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
675 | tape->name); | |
83dd5735 | 676 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
677 | idetape_media_access_finished(drive); |
678 | return ide_stopped; | |
679 | } else { | |
680 | return ide_do_reset(drive); | |
681 | } | |
5a04cfa9 BP |
682 | } else if (time_after(jiffies, |
683 | tape->dsc_polling_start + | |
684 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 685 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
686 | idetape_postpone_request(drive); |
687 | return ide_stopped; | |
688 | } | |
83dd5735 | 689 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
2e8a6f89 | 690 | pc = &tape->queued_pc; |
0014c75b | 691 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
692 | goto out; |
693 | } | |
83dd5735 | 694 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
2e8a6f89 | 695 | pc = &tape->queued_pc; |
0014c75b | 696 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
697 | goto out; |
698 | } | |
83dd5735 | 699 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
c267cc1c | 700 | pc = (struct ide_atapi_pc *)rq->special; |
83dd5735 BP |
701 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
702 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
703 | goto out; |
704 | } | |
83dd5735 | 705 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
706 | idetape_media_access_finished(drive); |
707 | return ide_stopped; | |
708 | } | |
709 | BUG(); | |
28c7214b | 710 | |
f2e3ab52 | 711 | out: |
6b544fcc BP |
712 | /* prepare sense request for this command */ |
713 | ide_prep_sense(drive, rq); | |
714 | ||
b788ee9c BZ |
715 | memset(&cmd, 0, sizeof(cmd)); |
716 | ||
717 | if (rq_data_dir(rq)) | |
718 | cmd.tf_flags |= IDE_TFLAG_WRITE; | |
719 | ||
720 | cmd.rq = rq; | |
721 | ||
5c4be572 TH |
722 | ide_init_sg_cmd(&cmd, pc->req_xfer); |
723 | ide_map_sg(drive, &cmd); | |
724 | ||
b788ee9c | 725 | return ide_tape_issue_pc(drive, &cmd, pc); |
1da177e4 LT |
726 | } |
727 | ||
1da177e4 | 728 | /* |
3c98bf34 BP |
729 | * Write a filemark if write_filemark=1. Flush the device buffers without |
730 | * writing a filemark otherwise. | |
1da177e4 | 731 | */ |
5a04cfa9 | 732 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 733 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 | 734 | { |
7bf7420a | 735 | ide_init_pc(pc); |
90699ce2 | 736 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 737 | pc->c[4] = write_filemark; |
346331f8 | 738 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
739 | } |
740 | ||
1da177e4 LT |
741 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
742 | { | |
743 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 744 | struct gendisk *disk = tape->disk; |
1da177e4 LT |
745 | int load_attempted = 0; |
746 | ||
3c98bf34 | 747 | /* Wait for the tape to become ready */ |
f2e3ab52 | 748 | set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
1da177e4 LT |
749 | timeout += jiffies; |
750 | while (time_before(jiffies, timeout)) { | |
de699ad5 | 751 | if (ide_do_test_unit_ready(drive, disk) == 0) |
1da177e4 LT |
752 | return 0; |
753 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
754 | || (tape->asc == 0x3A)) { |
755 | /* no media */ | |
1da177e4 LT |
756 | if (load_attempted) |
757 | return -ENOMEDIUM; | |
0c8a6c7a | 758 | ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
1da177e4 LT |
759 | load_attempted = 1; |
760 | /* not about to be ready */ | |
761 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
762 | (tape->ascq == 1 || tape->ascq == 8))) | |
763 | return -EIO; | |
80ce45fd | 764 | msleep(100); |
1da177e4 LT |
765 | } |
766 | return -EIO; | |
767 | } | |
768 | ||
5a04cfa9 | 769 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 770 | { |
2ac07d92 | 771 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 772 | struct ide_atapi_pc pc; |
1da177e4 LT |
773 | int rc; |
774 | ||
775 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
2ac07d92 | 776 | rc = ide_queue_pc_tail(drive, tape->disk, &pc); |
5a04cfa9 | 777 | if (rc) |
1da177e4 LT |
778 | return rc; |
779 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
780 | return 0; | |
781 | } | |
782 | ||
d236d74c | 783 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 784 | { |
7bf7420a | 785 | ide_init_pc(pc); |
90699ce2 | 786 | pc->c[0] = READ_POSITION; |
d236d74c | 787 | pc->req_xfer = 20; |
1da177e4 LT |
788 | } |
789 | ||
5a04cfa9 | 790 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
791 | { |
792 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 793 | struct ide_atapi_pc pc; |
1da177e4 LT |
794 | int position; |
795 | ||
8004a8c9 | 796 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
797 | |
798 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 799 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) |
1da177e4 | 800 | return -1; |
54bb2074 | 801 | position = tape->first_frame; |
1da177e4 LT |
802 | return position; |
803 | } | |
804 | ||
d236d74c BP |
805 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
806 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 807 | unsigned int block, u8 partition, int skip) |
1da177e4 | 808 | { |
7bf7420a | 809 | ide_init_pc(pc); |
90699ce2 | 810 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 811 | pc->c[1] = 2; |
860ff5ec | 812 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 813 | pc->c[8] = partition; |
346331f8 | 814 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
815 | } |
816 | ||
ec0fdb01 | 817 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
818 | { |
819 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 820 | |
54abf37e | 821 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 822 | return; |
1da177e4 | 823 | |
f2e3ab52 | 824 | clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); |
963da55c TH |
825 | tape->valid = 0; |
826 | if (tape->buf != NULL) { | |
827 | kfree(tape->buf); | |
828 | tape->buf = NULL; | |
1da177e4 LT |
829 | } |
830 | ||
54abf37e | 831 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
832 | } |
833 | ||
834 | /* | |
3c98bf34 BP |
835 | * Position the tape to the requested block using the LOCATE packet command. |
836 | * A READ POSITION command is then issued to check where we are positioned. Like | |
837 | * all higher level operations, we queue the commands at the tail of the request | |
838 | * queue and wait for their completion. | |
1da177e4 | 839 | */ |
5a04cfa9 BP |
840 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
841 | u8 partition, int skip) | |
1da177e4 LT |
842 | { |
843 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 844 | struct gendisk *disk = tape->disk; |
1da177e4 | 845 | int retval; |
d236d74c | 846 | struct ide_atapi_pc pc; |
1da177e4 | 847 | |
54abf37e | 848 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 849 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
850 | idetape_wait_ready(drive, 60 * 5 * HZ); |
851 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
2ac07d92 | 852 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
853 | if (retval) |
854 | return (retval); | |
855 | ||
856 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 857 | return ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
858 | } |
859 | ||
ec0fdb01 | 860 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 861 | int restore_position) |
1da177e4 LT |
862 | { |
863 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
864 | int seek, position; |
865 | ||
ec0fdb01 | 866 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
867 | if (restore_position) { |
868 | position = idetape_read_position(drive); | |
9798630a | 869 | seek = position > 0 ? position : 0; |
1da177e4 | 870 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 871 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 872 | " %s\n", tape->name, __func__); |
1da177e4 LT |
873 | return; |
874 | } | |
875 | } | |
876 | } | |
877 | ||
878 | /* | |
3c98bf34 BP |
879 | * Generate a read/write request for the block device interface and wait for it |
880 | * to be serviced. | |
1da177e4 | 881 | */ |
963da55c | 882 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks) |
1da177e4 LT |
883 | { |
884 | idetape_tape_t *tape = drive->driver_data; | |
21d9c5d2 | 885 | size_t size = blocks * tape->blk_size; |
64ea1b4a | 886 | struct request *rq; |
21d9c5d2 | 887 | int ret; |
1da177e4 | 888 | |
8004a8c9 | 889 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
21d9c5d2 | 890 | BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); |
8004a8c9 | 891 | |
64ea1b4a FT |
892 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
893 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 894 | rq->cmd[13] = cmd; |
64ea1b4a | 895 | rq->rq_disk = tape->disk; |
64ea1b4a | 896 | rq->sector = tape->first_frame; |
21d9c5d2 TH |
897 | |
898 | if (size) { | |
963da55c | 899 | ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, |
21d9c5d2 TH |
900 | __GFP_WAIT); |
901 | if (ret) | |
902 | goto out_put; | |
903 | } | |
904 | ||
64ea1b4a FT |
905 | blk_execute_rq(drive->queue, tape->disk, rq, 0); |
906 | ||
963da55c | 907 | /* calculate the number of transferred bytes and update buffer state */ |
21d9c5d2 | 908 | size -= rq->data_len; |
963da55c | 909 | tape->cur = tape->buf; |
21d9c5d2 | 910 | if (cmd == REQ_IDETAPE_READ) |
963da55c TH |
911 | tape->valid = size; |
912 | else | |
913 | tape->valid = 0; | |
1da177e4 | 914 | |
21d9c5d2 TH |
915 | ret = size; |
916 | if (rq->errors == IDE_DRV_ERROR_GENERAL) | |
917 | ret = -EIO; | |
21d9c5d2 TH |
918 | out_put: |
919 | blk_put_request(rq); | |
64ea1b4a | 920 | return ret; |
1da177e4 LT |
921 | } |
922 | ||
d236d74c | 923 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 924 | { |
7bf7420a | 925 | ide_init_pc(pc); |
90699ce2 | 926 | pc->c[0] = INQUIRY; |
5a04cfa9 | 927 | pc->c[4] = 254; |
d236d74c | 928 | pc->req_xfer = 254; |
1da177e4 LT |
929 | } |
930 | ||
d236d74c BP |
931 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
932 | struct ide_atapi_pc *pc) | |
1da177e4 | 933 | { |
7bf7420a | 934 | ide_init_pc(pc); |
90699ce2 | 935 | pc->c[0] = REZERO_UNIT; |
346331f8 | 936 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
937 | } |
938 | ||
d236d74c | 939 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 940 | { |
7bf7420a | 941 | ide_init_pc(pc); |
90699ce2 | 942 | pc->c[0] = ERASE; |
1da177e4 | 943 | pc->c[1] = 1; |
346331f8 | 944 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
945 | } |
946 | ||
d236d74c | 947 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 | 948 | { |
7bf7420a | 949 | ide_init_pc(pc); |
90699ce2 | 950 | pc->c[0] = SPACE; |
860ff5ec | 951 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 952 | pc->c[1] = cmd; |
346331f8 | 953 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
954 | } |
955 | ||
97c566ce | 956 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 957 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 | 958 | { |
8004a8c9 | 959 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 960 | |
963da55c | 961 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks); |
1da177e4 LT |
962 | } |
963 | ||
d9df937a | 964 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
965 | { |
966 | idetape_tape_t *tape = drive->driver_data; | |
35ab8d32 | 967 | int blocks; |
55a5d291 | 968 | |
54abf37e | 969 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 970 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 971 | " but we are not writing.\n"); |
1da177e4 LT |
972 | return; |
973 | } | |
963da55c TH |
974 | if (tape->buf) { |
975 | blocks = tape->valid / tape->blk_size; | |
976 | if (tape->valid % tape->blk_size) { | |
1da177e4 | 977 | blocks++; |
963da55c TH |
978 | memset(tape->buf + tape->valid, 0, |
979 | tape->blk_size - tape->valid % tape->blk_size); | |
1da177e4 LT |
980 | } |
981 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
1da177e4 | 982 | } |
963da55c TH |
983 | if (tape->buf != NULL) { |
984 | kfree(tape->buf); | |
985 | tape->buf = NULL; | |
1da177e4 | 986 | } |
54abf37e | 987 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
988 | } |
989 | ||
83042b24 | 990 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
991 | { |
992 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 993 | int bytes_read; |
1da177e4 LT |
994 | |
995 | /* Initialize read operation */ | |
54abf37e BP |
996 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
997 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
d9df937a | 998 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
999 | idetape_flush_tape_buffers(drive); |
1000 | } | |
963da55c TH |
1001 | if (tape->buf || tape->valid) { |
1002 | printk(KERN_ERR "ide-tape: valid should be 0 now\n"); | |
1003 | tape->valid = 0; | |
1da177e4 | 1004 | } |
963da55c TH |
1005 | tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); |
1006 | if (!tape->buf) | |
1da177e4 | 1007 | return -ENOMEM; |
54abf37e | 1008 | tape->chrdev_dir = IDETAPE_DIR_READ; |
963da55c | 1009 | tape->cur = tape->buf; |
1da177e4 LT |
1010 | |
1011 | /* | |
3c98bf34 BP |
1012 | * Issue a read 0 command to ensure that DSC handshake is |
1013 | * switched from completion mode to buffer available mode. | |
1014 | * No point in issuing this if DSC overlap isn't supported, some | |
1015 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 | 1016 | */ |
97100fc8 | 1017 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { |
5a04cfa9 | 1018 | bytes_read = idetape_queue_rw_tail(drive, |
963da55c | 1019 | REQ_IDETAPE_READ, 0); |
1da177e4 | 1020 | if (bytes_read < 0) { |
963da55c TH |
1021 | kfree(tape->buf); |
1022 | tape->buf = NULL; | |
54abf37e | 1023 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1024 | return bytes_read; |
1025 | } | |
1026 | } | |
1027 | } | |
5e69bd95 | 1028 | |
1da177e4 LT |
1029 | return 0; |
1030 | } | |
1031 | ||
5bd50dc6 | 1032 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1033 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 | 1034 | { |
8004a8c9 | 1035 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1036 | |
3c98bf34 | 1037 | /* If we are at a filemark, return a read length of 0 */ |
f2e3ab52 | 1038 | if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 LT |
1039 | return 0; |
1040 | ||
83042b24 | 1041 | idetape_init_read(drive); |
5e69bd95 | 1042 | |
963da55c | 1043 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks); |
1da177e4 LT |
1044 | } |
1045 | ||
5a04cfa9 | 1046 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1047 | { |
1048 | idetape_tape_t *tape = drive->driver_data; | |
963da55c TH |
1049 | |
1050 | memset(tape->buf, 0, tape->buffer_size); | |
3c98bf34 | 1051 | |
1da177e4 | 1052 | while (bcount) { |
963da55c | 1053 | unsigned int count = min(tape->buffer_size, bcount); |
1da177e4 | 1054 | |
963da55c TH |
1055 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
1056 | count / tape->blk_size); | |
1da177e4 | 1057 | bcount -= count; |
1da177e4 LT |
1058 | } |
1059 | } | |
1060 | ||
1da177e4 | 1061 | /* |
3c98bf34 BP |
1062 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1063 | * currently support only one partition. | |
1064 | */ | |
5a04cfa9 | 1065 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 | 1066 | { |
2ac07d92 BZ |
1067 | struct ide_tape_obj *tape = drive->driver_data; |
1068 | struct gendisk *disk = tape->disk; | |
1da177e4 | 1069 | int retval; |
d236d74c | 1070 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1071 | |
1072 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1073 | ||
1da177e4 | 1074 | idetape_create_rewind_cmd(drive, &pc); |
2ac07d92 | 1075 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1076 | if (retval) |
1077 | return retval; | |
1078 | ||
1079 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1080 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1081 | if (retval) |
1082 | return retval; | |
1083 | return 0; | |
1084 | } | |
1085 | ||
3c98bf34 | 1086 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1087 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1088 | unsigned long arg) | |
1da177e4 LT |
1089 | { |
1090 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1091 | void __user *argp = (void __user *)arg; |
1092 | ||
d59823fa BP |
1093 | struct idetape_config { |
1094 | int dsc_rw_frequency; | |
1095 | int dsc_media_access_frequency; | |
1096 | int nr_stages; | |
1097 | } config; | |
1098 | ||
8004a8c9 BP |
1099 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1100 | ||
1da177e4 | 1101 | switch (cmd) { |
5a04cfa9 BP |
1102 | case 0x0340: |
1103 | if (copy_from_user(&config, argp, sizeof(config))) | |
1104 | return -EFAULT; | |
1105 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1106 | break; |
1107 | case 0x0350: | |
1108 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1109 | config.nr_stages = 1; |
5a04cfa9 BP |
1110 | if (copy_to_user(argp, &config, sizeof(config))) |
1111 | return -EFAULT; | |
1112 | break; | |
1113 | default: | |
1114 | return -EIO; | |
1da177e4 LT |
1115 | } |
1116 | return 0; | |
1117 | } | |
1118 | ||
5a04cfa9 BP |
1119 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1120 | int mt_count) | |
1da177e4 LT |
1121 | { |
1122 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1123 | struct gendisk *disk = tape->disk; |
d236d74c | 1124 | struct ide_atapi_pc pc; |
5a04cfa9 | 1125 | int retval, count = 0; |
b6422013 | 1126 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1127 | |
1128 | if (mt_count == 0) | |
1129 | return 0; | |
1130 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1131 | if (!sprev) |
1da177e4 | 1132 | return -EIO; |
5a04cfa9 | 1133 | mt_count = -mt_count; |
1da177e4 LT |
1134 | } |
1135 | ||
54abf37e | 1136 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
963da55c | 1137 | tape->valid = 0; |
f2e3ab52 | 1138 | if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 | 1139 | ++count; |
ec0fdb01 | 1140 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1141 | } |
1142 | ||
1da177e4 | 1143 | switch (mt_op) { |
5a04cfa9 BP |
1144 | case MTFSF: |
1145 | case MTBSF: | |
1146 | idetape_create_space_cmd(&pc, mt_count - count, | |
1147 | IDETAPE_SPACE_OVER_FILEMARK); | |
2ac07d92 | 1148 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1149 | case MTFSFM: |
1150 | case MTBSFM: | |
1151 | if (!sprev) | |
1152 | return -EIO; | |
1153 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1154 | mt_count - count); | |
1155 | if (retval) | |
1156 | return retval; | |
1157 | count = (MTBSFM == mt_op ? 1 : -1); | |
1158 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1159 | default: | |
1160 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1161 | mt_op); | |
1162 | return -EIO; | |
1da177e4 LT |
1163 | } |
1164 | } | |
1165 | ||
1da177e4 | 1166 | /* |
3c98bf34 | 1167 | * Our character device read / write functions. |
1da177e4 | 1168 | * |
3c98bf34 BP |
1169 | * The tape is optimized to maximize throughput when it is transferring an |
1170 | * integral number of the "continuous transfer limit", which is a parameter of | |
1171 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1172 | * |
3c98bf34 BP |
1173 | * As of version 1.3 of the driver, the character device provides an abstract |
1174 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1175 | * same backup/restore procedure is supported. The driver will internally | |
1176 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1177 | * between the user's block size to the recommended size will only result in a | |
1178 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1179 | * This is not applicable to Onstream. | |
1da177e4 | 1180 | */ |
5a04cfa9 BP |
1181 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1182 | size_t count, loff_t *ppos) | |
1da177e4 | 1183 | { |
5aeddf90 | 1184 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1185 | ide_drive_t *drive = tape->drive; |
5a04cfa9 | 1186 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 1187 | ssize_t ret = 0; |
b6422013 | 1188 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 1189 | |
8004a8c9 | 1190 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1191 | |
54abf37e | 1192 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
f2e3ab52 | 1193 | if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) |
54bb2074 BP |
1194 | if (count > tape->blk_size && |
1195 | (count % tape->blk_size) == 0) | |
1196 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1197 | } |
83042b24 | 1198 | rc = idetape_init_read(drive); |
8d06bfad | 1199 | if (rc < 0) |
1da177e4 LT |
1200 | return rc; |
1201 | if (count == 0) | |
1202 | return (0); | |
963da55c TH |
1203 | if (tape->valid) { |
1204 | actually_read = min_t(unsigned int, tape->valid, count); | |
1205 | if (copy_to_user(buf, tape->cur, actually_read)) | |
dcd96379 | 1206 | ret = -EFAULT; |
1da177e4 | 1207 | buf += actually_read; |
1da177e4 | 1208 | count -= actually_read; |
963da55c TH |
1209 | tape->cur += actually_read; |
1210 | tape->valid -= actually_read; | |
1da177e4 | 1211 | } |
f73850a3 | 1212 | while (count >= tape->buffer_size) { |
b6422013 | 1213 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1214 | if (bytes_read <= 0) |
1215 | goto finish; | |
963da55c | 1216 | if (copy_to_user(buf, tape->cur, bytes_read)) |
dcd96379 | 1217 | ret = -EFAULT; |
1da177e4 LT |
1218 | buf += bytes_read; |
1219 | count -= bytes_read; | |
1220 | actually_read += bytes_read; | |
1221 | } | |
1222 | if (count) { | |
b6422013 | 1223 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1224 | if (bytes_read <= 0) |
1225 | goto finish; | |
1226 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
963da55c | 1227 | if (copy_to_user(buf, tape->cur, temp)) |
dcd96379 | 1228 | ret = -EFAULT; |
1da177e4 | 1229 | actually_read += temp; |
963da55c TH |
1230 | tape->cur += temp; |
1231 | tape->valid -= temp; | |
1da177e4 LT |
1232 | } |
1233 | finish: | |
f2e3ab52 | 1234 | if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { |
8004a8c9 BP |
1235 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1236 | ||
1da177e4 LT |
1237 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1238 | return 0; | |
1239 | } | |
dcd96379 | 1240 | |
5a04cfa9 | 1241 | return ret ? ret : actually_read; |
1da177e4 LT |
1242 | } |
1243 | ||
5a04cfa9 | 1244 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1245 | size_t count, loff_t *ppos) |
1246 | { | |
5aeddf90 | 1247 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1248 | ide_drive_t *drive = tape->drive; |
dcd96379 DW |
1249 | ssize_t actually_written = 0; |
1250 | ssize_t ret = 0; | |
b6422013 | 1251 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
1252 | |
1253 | /* The drive is write protected. */ | |
1254 | if (tape->write_prot) | |
1255 | return -EACCES; | |
1256 | ||
8004a8c9 | 1257 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1258 | |
1259 | /* Initialize write operation */ | |
54abf37e BP |
1260 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
1261 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1262 | ide_tape_discard_merge_buffer(drive, 1); |
963da55c TH |
1263 | if (tape->buf || tape->valid) { |
1264 | printk(KERN_ERR "ide-tape: valid should be 0 now\n"); | |
1265 | tape->valid = 0; | |
1da177e4 | 1266 | } |
963da55c TH |
1267 | tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); |
1268 | if (!tape->buf) | |
1da177e4 | 1269 | return -ENOMEM; |
54abf37e | 1270 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
963da55c | 1271 | tape->cur = tape->buf; |
1da177e4 LT |
1272 | |
1273 | /* | |
3c98bf34 BP |
1274 | * Issue a write 0 command to ensure that DSC handshake is |
1275 | * switched from completion mode to buffer available mode. No | |
1276 | * point in issuing this if DSC overlap isn't supported, some | |
1277 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 | 1278 | */ |
97100fc8 | 1279 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { |
5a04cfa9 | 1280 | ssize_t retval = idetape_queue_rw_tail(drive, |
963da55c | 1281 | REQ_IDETAPE_WRITE, 0); |
1da177e4 | 1282 | if (retval < 0) { |
963da55c TH |
1283 | kfree(tape->buf); |
1284 | tape->buf = NULL; | |
54abf37e | 1285 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1286 | return retval; |
1287 | } | |
1288 | } | |
1289 | } | |
1290 | if (count == 0) | |
1291 | return (0); | |
963da55c TH |
1292 | if (tape->valid < tape->buffer_size) { |
1293 | actually_written = min_t(unsigned int, | |
1294 | tape->buffer_size - tape->valid, | |
1295 | count); | |
1296 | if (copy_from_user(tape->cur, buf, actually_written)) | |
1297 | ret = -EFAULT; | |
1da177e4 | 1298 | buf += actually_written; |
1da177e4 | 1299 | count -= actually_written; |
963da55c TH |
1300 | tape->cur += actually_written; |
1301 | tape->valid += actually_written; | |
1da177e4 | 1302 | |
963da55c | 1303 | if (tape->valid == tape->buffer_size) { |
dcd96379 | 1304 | ssize_t retval; |
b6422013 | 1305 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
1306 | if (retval <= 0) |
1307 | return (retval); | |
1308 | } | |
1309 | } | |
f73850a3 | 1310 | while (count >= tape->buffer_size) { |
dcd96379 | 1311 | ssize_t retval; |
963da55c | 1312 | if (copy_from_user(tape->cur, buf, tape->buffer_size)) |
dcd96379 | 1313 | ret = -EFAULT; |
f73850a3 BP |
1314 | buf += tape->buffer_size; |
1315 | count -= tape->buffer_size; | |
b6422013 | 1316 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 1317 | actually_written += tape->buffer_size; |
1da177e4 LT |
1318 | if (retval <= 0) |
1319 | return (retval); | |
1320 | } | |
1321 | if (count) { | |
1322 | actually_written += count; | |
963da55c | 1323 | if (copy_from_user(tape->cur, buf, count)) |
dcd96379 | 1324 | ret = -EFAULT; |
963da55c TH |
1325 | tape->cur += count; |
1326 | tape->valid += count; | |
1da177e4 | 1327 | } |
5a04cfa9 | 1328 | return ret ? ret : actually_written; |
1da177e4 LT |
1329 | } |
1330 | ||
5a04cfa9 | 1331 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1332 | { |
2ac07d92 | 1333 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1334 | struct ide_atapi_pc pc; |
1da177e4 LT |
1335 | |
1336 | /* Write a filemark */ | |
1337 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
2ac07d92 | 1338 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
1da177e4 LT |
1339 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
1340 | return -EIO; | |
1341 | } | |
1342 | return 0; | |
1343 | } | |
1344 | ||
1345 | /* | |
d99c9da2 BP |
1346 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1347 | * requested. | |
1da177e4 | 1348 | * |
d99c9da2 BP |
1349 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1350 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1351 | * usually not supported. |
1da177e4 | 1352 | * |
d99c9da2 | 1353 | * The following commands are currently not supported: |
1da177e4 | 1354 | * |
d99c9da2 BP |
1355 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1356 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1357 | */ |
d99c9da2 | 1358 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1359 | { |
1360 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1361 | struct gendisk *disk = tape->disk; |
d236d74c | 1362 | struct ide_atapi_pc pc; |
5a04cfa9 | 1363 | int i, retval; |
1da177e4 | 1364 | |
8004a8c9 BP |
1365 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
1366 | mt_op, mt_count); | |
5a04cfa9 | 1367 | |
1da177e4 | 1368 | switch (mt_op) { |
5a04cfa9 BP |
1369 | case MTFSF: |
1370 | case MTFSFM: | |
1371 | case MTBSF: | |
1372 | case MTBSFM: | |
1373 | if (!mt_count) | |
1374 | return 0; | |
1375 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1376 | default: | |
1377 | break; | |
1da177e4 | 1378 | } |
5a04cfa9 | 1379 | |
1da177e4 | 1380 | switch (mt_op) { |
5a04cfa9 BP |
1381 | case MTWEOF: |
1382 | if (tape->write_prot) | |
1383 | return -EACCES; | |
ec0fdb01 | 1384 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1385 | for (i = 0; i < mt_count; i++) { |
1386 | retval = idetape_write_filemark(drive); | |
1387 | if (retval) | |
1388 | return retval; | |
1389 | } | |
1390 | return 0; | |
1391 | case MTREW: | |
ec0fdb01 | 1392 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1393 | if (idetape_rewind_tape(drive)) |
1394 | return -EIO; | |
1395 | return 0; | |
1396 | case MTLOAD: | |
ec0fdb01 | 1397 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1398 | return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1399 | case MTUNLOAD: |
1400 | case MTOFFL: | |
1401 | /* | |
1402 | * If door is locked, attempt to unlock before | |
1403 | * attempting to eject. | |
1404 | */ | |
1405 | if (tape->door_locked) { | |
0578042d | 1406 | if (!ide_set_media_lock(drive, disk, 0)) |
385a4b87 | 1407 | tape->door_locked = DOOR_UNLOCKED; |
5a04cfa9 | 1408 | } |
ec0fdb01 | 1409 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1410 | retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); |
5a04cfa9 | 1411 | if (!retval) |
f2e3ab52 | 1412 | clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
5a04cfa9 BP |
1413 | return retval; |
1414 | case MTNOP: | |
ec0fdb01 | 1415 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1416 | return idetape_flush_tape_buffers(drive); |
1417 | case MTRETEN: | |
ec0fdb01 | 1418 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1419 | return ide_do_start_stop(drive, disk, |
5a04cfa9 | 1420 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1421 | case MTEOM: |
1422 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
2ac07d92 | 1423 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1424 | case MTERASE: |
1425 | (void)idetape_rewind_tape(drive); | |
1426 | idetape_create_erase_cmd(&pc); | |
2ac07d92 | 1427 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1428 | case MTSETBLK: |
1429 | if (mt_count) { | |
1430 | if (mt_count < tape->blk_size || | |
1431 | mt_count % tape->blk_size) | |
1da177e4 | 1432 | return -EIO; |
5a04cfa9 | 1433 | tape->user_bs_factor = mt_count / tape->blk_size; |
f2e3ab52 | 1434 | clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 | 1435 | } else |
f2e3ab52 | 1436 | set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 BP |
1437 | return 0; |
1438 | case MTSEEK: | |
ec0fdb01 | 1439 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1440 | return idetape_position_tape(drive, |
1441 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1442 | case MTSETPART: | |
ec0fdb01 | 1443 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1444 | return idetape_position_tape(drive, 0, mt_count, 0); |
1445 | case MTFSR: | |
1446 | case MTBSR: | |
1447 | case MTLOCK: | |
0578042d | 1448 | retval = ide_set_media_lock(drive, disk, 1); |
5a04cfa9 | 1449 | if (retval) |
1da177e4 | 1450 | return retval; |
5a04cfa9 BP |
1451 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1452 | return 0; | |
1453 | case MTUNLOCK: | |
0578042d | 1454 | retval = ide_set_media_lock(drive, disk, 0); |
5a04cfa9 BP |
1455 | if (retval) |
1456 | return retval; | |
1457 | tape->door_locked = DOOR_UNLOCKED; | |
1458 | return 0; | |
1459 | default: | |
1460 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1461 | mt_op); | |
1462 | return -EIO; | |
1da177e4 LT |
1463 | } |
1464 | } | |
1465 | ||
1466 | /* | |
d99c9da2 BP |
1467 | * Our character device ioctls. General mtio.h magnetic io commands are |
1468 | * supported here, and not in the corresponding block interface. Our own | |
1469 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 1470 | */ |
d99c9da2 BP |
1471 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
1472 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1473 | { |
5aeddf90 | 1474 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 LT |
1475 | ide_drive_t *drive = tape->drive; |
1476 | struct mtop mtop; | |
1477 | struct mtget mtget; | |
1478 | struct mtpos mtpos; | |
54bb2074 | 1479 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
1480 | void __user *argp = (void __user *)arg; |
1481 | ||
8004a8c9 | 1482 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 1483 | |
54abf37e | 1484 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 1485 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1486 | idetape_flush_tape_buffers(drive); |
1487 | } | |
1488 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
963da55c | 1489 | block_offset = tape->valid / |
54bb2074 | 1490 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
1491 | position = idetape_read_position(drive); |
1492 | if (position < 0) | |
1da177e4 LT |
1493 | return -EIO; |
1494 | } | |
1495 | switch (cmd) { | |
5a04cfa9 BP |
1496 | case MTIOCTOP: |
1497 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
1498 | return -EFAULT; | |
1499 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
1500 | case MTIOCGET: | |
1501 | memset(&mtget, 0, sizeof(struct mtget)); | |
1502 | mtget.mt_type = MT_ISSCSI2; | |
1503 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1504 | mtget.mt_dsreg = | |
1505 | ((tape->blk_size * tape->user_bs_factor) | |
1506 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
1507 | ||
1508 | if (tape->drv_write_prot) | |
1509 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
1510 | ||
1511 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
1512 | return -EFAULT; | |
1513 | return 0; | |
1514 | case MTIOCPOS: | |
1515 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1516 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
1517 | return -EFAULT; | |
1518 | return 0; | |
1519 | default: | |
1520 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1521 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 1522 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
1523 | } |
1524 | } | |
1525 | ||
3cffb9ce BP |
1526 | /* |
1527 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
1528 | * block size with the reported value. | |
1529 | */ | |
1530 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
1531 | { | |
1532 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1533 | struct ide_atapi_pc pc; |
3cffb9ce BP |
1534 | |
1535 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2ac07d92 | 1536 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
3cffb9ce | 1537 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
54bb2074 | 1538 | if (tape->blk_size == 0) { |
3cffb9ce BP |
1539 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
1540 | "block size, assuming 32k\n"); | |
54bb2074 | 1541 | tape->blk_size = 32768; |
3cffb9ce BP |
1542 | } |
1543 | return; | |
1544 | } | |
d236d74c BP |
1545 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
1546 | (pc.buf[4 + 6] << 8) + | |
1547 | pc.buf[4 + 7]; | |
1548 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 1549 | } |
1da177e4 | 1550 | |
5a04cfa9 | 1551 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
1552 | { |
1553 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
1554 | ide_drive_t *drive; | |
1555 | idetape_tape_t *tape; | |
1da177e4 LT |
1556 | int retval; |
1557 | ||
8004a8c9 BP |
1558 | if (i >= MAX_HWIFS * MAX_DRIVES) |
1559 | return -ENXIO; | |
1560 | ||
04f4ac9d | 1561 | lock_kernel(); |
8004a8c9 | 1562 | tape = ide_tape_chrdev_get(i); |
04f4ac9d JC |
1563 | if (!tape) { |
1564 | unlock_kernel(); | |
8004a8c9 | 1565 | return -ENXIO; |
04f4ac9d | 1566 | } |
8004a8c9 BP |
1567 | |
1568 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1569 | ||
1da177e4 LT |
1570 | /* |
1571 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1572 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1573 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1574 | */ | |
1575 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1576 | ||
1da177e4 LT |
1577 | drive = tape->drive; |
1578 | ||
1579 | filp->private_data = tape; | |
1580 | ||
f2e3ab52 | 1581 | if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { |
1da177e4 LT |
1582 | retval = -EBUSY; |
1583 | goto out_put_tape; | |
1584 | } | |
1585 | ||
1586 | retval = idetape_wait_ready(drive, 60 * HZ); | |
1587 | if (retval) { | |
f2e3ab52 | 1588 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1589 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
1590 | goto out_put_tape; | |
1591 | } | |
1592 | ||
1593 | idetape_read_position(drive); | |
f2e3ab52 | 1594 | if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) |
1da177e4 LT |
1595 | (void)idetape_rewind_tape(drive); |
1596 | ||
1da177e4 | 1597 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 1598 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
1599 | |
1600 | /* Set write protect flag if device is opened as read-only. */ | |
1601 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
1602 | tape->write_prot = 1; | |
1603 | else | |
1604 | tape->write_prot = tape->drv_write_prot; | |
1605 | ||
1606 | /* Make sure drive isn't write protected if user wants to write. */ | |
1607 | if (tape->write_prot) { | |
1608 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
1609 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
f2e3ab52 | 1610 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1611 | retval = -EROFS; |
1612 | goto out_put_tape; | |
1613 | } | |
1614 | } | |
1615 | ||
3c98bf34 | 1616 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 1617 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
0578042d | 1618 | if (!ide_set_media_lock(drive, tape->disk, 1)) { |
385a4b87 BZ |
1619 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
1620 | tape->door_locked = DOOR_LOCKED; | |
1da177e4 LT |
1621 | } |
1622 | } | |
04f4ac9d | 1623 | unlock_kernel(); |
1da177e4 LT |
1624 | return 0; |
1625 | ||
1626 | out_put_tape: | |
1627 | ide_tape_put(tape); | |
04f4ac9d | 1628 | unlock_kernel(); |
1da177e4 LT |
1629 | return retval; |
1630 | } | |
1631 | ||
5a04cfa9 | 1632 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
1633 | { |
1634 | idetape_tape_t *tape = drive->driver_data; | |
1635 | ||
d9df937a | 1636 | ide_tape_flush_merge_buffer(drive); |
963da55c TH |
1637 | tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); |
1638 | if (tape->buf != NULL) { | |
54bb2074 BP |
1639 | idetape_pad_zeros(drive, tape->blk_size * |
1640 | (tape->user_bs_factor - 1)); | |
963da55c TH |
1641 | kfree(tape->buf); |
1642 | tape->buf = NULL; | |
1da177e4 LT |
1643 | } |
1644 | idetape_write_filemark(drive); | |
1645 | idetape_flush_tape_buffers(drive); | |
1646 | idetape_flush_tape_buffers(drive); | |
1647 | } | |
1648 | ||
5a04cfa9 | 1649 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 | 1650 | { |
5aeddf90 | 1651 | struct ide_tape_obj *tape = filp->private_data; |
1da177e4 | 1652 | ide_drive_t *drive = tape->drive; |
1da177e4 LT |
1653 | unsigned int minor = iminor(inode); |
1654 | ||
1655 | lock_kernel(); | |
1656 | tape = drive->driver_data; | |
8004a8c9 BP |
1657 | |
1658 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 1659 | |
54abf37e | 1660 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 1661 | idetape_write_release(drive, minor); |
54abf37e | 1662 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 1663 | if (minor < 128) |
ec0fdb01 | 1664 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 1665 | } |
f64eee7b | 1666 | |
f2e3ab52 | 1667 | if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) |
1da177e4 | 1668 | (void) idetape_rewind_tape(drive); |
54abf37e | 1669 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 | 1670 | if (tape->door_locked == DOOR_LOCKED) { |
0578042d | 1671 | if (!ide_set_media_lock(drive, tape->disk, 0)) |
385a4b87 | 1672 | tape->door_locked = DOOR_UNLOCKED; |
1da177e4 LT |
1673 | } |
1674 | } | |
f2e3ab52 | 1675 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1676 | ide_tape_put(tape); |
1677 | unlock_kernel(); | |
1678 | return 0; | |
1679 | } | |
1680 | ||
6d29c8f0 | 1681 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 1682 | { |
1da177e4 | 1683 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 1684 | struct ide_atapi_pc pc; |
41fa9f86 | 1685 | u8 pc_buf[256]; |
801bd32e | 1686 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 1687 | |
1da177e4 | 1688 | idetape_create_inquiry_cmd(&pc); |
41fa9f86 BZ |
1689 | pc.buf = &pc_buf[0]; |
1690 | pc.buf_size = sizeof(pc_buf); | |
1691 | ||
2ac07d92 | 1692 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
6d29c8f0 BP |
1693 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
1694 | tape->name); | |
1da177e4 LT |
1695 | return; |
1696 | } | |
d236d74c BP |
1697 | memcpy(vendor_id, &pc.buf[8], 8); |
1698 | memcpy(product_id, &pc.buf[16], 16); | |
1699 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 | 1700 | |
801bd32e BP |
1701 | ide_fixstring(vendor_id, 8, 0); |
1702 | ide_fixstring(product_id, 16, 0); | |
1703 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 1704 | |
801bd32e | 1705 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 1706 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
1707 | } |
1708 | ||
1709 | /* | |
b6422013 BP |
1710 | * Ask the tape about its various parameters. In particular, we will adjust our |
1711 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 1712 | */ |
5a04cfa9 | 1713 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
1714 | { |
1715 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1716 | struct ide_atapi_pc pc; |
b6422013 BP |
1717 | u8 *caps; |
1718 | u8 speed, max_speed; | |
47314fa4 | 1719 | |
1da177e4 | 1720 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2ac07d92 | 1721 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
b6422013 BP |
1722 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
1723 | " some default values\n"); | |
54bb2074 | 1724 | tape->blk_size = 512; |
b6422013 BP |
1725 | put_unaligned(52, (u16 *)&tape->caps[12]); |
1726 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
1727 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
1728 | return; |
1729 | } | |
d236d74c | 1730 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
1731 | |
1732 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
1733 | speed = be16_to_cpup((__be16 *)&caps[14]); |
1734 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 1735 | |
cd740ab0 HH |
1736 | *(u16 *)&caps[8] = max_speed; |
1737 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
1738 | *(u16 *)&caps[14] = speed; | |
1739 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 1740 | |
b6422013 BP |
1741 | if (!speed) { |
1742 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
1743 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 1744 | *(u16 *)&caps[14] = 650; |
1da177e4 | 1745 | } |
b6422013 BP |
1746 | if (!max_speed) { |
1747 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
1748 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 1749 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
1750 | } |
1751 | ||
b6422013 | 1752 | memcpy(&tape->caps, caps, 20); |
0578042d BZ |
1753 | |
1754 | /* device lacks locking support according to capabilities page */ | |
1755 | if ((caps[6] & 1) == 0) | |
42619d35 | 1756 | drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; |
0578042d | 1757 | |
b6422013 | 1758 | if (caps[7] & 0x02) |
54bb2074 | 1759 | tape->blk_size = 512; |
b6422013 | 1760 | else if (caps[7] & 0x04) |
54bb2074 | 1761 | tape->blk_size = 1024; |
1da177e4 LT |
1762 | } |
1763 | ||
7662d046 | 1764 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
1765 | #define ide_tape_devset_get(name, field) \ |
1766 | static int get_##name(ide_drive_t *drive) \ | |
1767 | { \ | |
1768 | idetape_tape_t *tape = drive->driver_data; \ | |
1769 | return tape->field; \ | |
1770 | } | |
1771 | ||
1772 | #define ide_tape_devset_set(name, field) \ | |
1773 | static int set_##name(ide_drive_t *drive, int arg) \ | |
1774 | { \ | |
1775 | idetape_tape_t *tape = drive->driver_data; \ | |
1776 | tape->field = arg; \ | |
1777 | return 0; \ | |
1778 | } | |
1779 | ||
92f1f8fd | 1780 | #define ide_tape_devset_rw_field(_name, _field) \ |
8185d5aa BZ |
1781 | ide_tape_devset_get(_name, _field) \ |
1782 | ide_tape_devset_set(_name, _field) \ | |
92f1f8fd | 1783 | IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) |
8185d5aa | 1784 | |
92f1f8fd | 1785 | #define ide_tape_devset_r_field(_name, _field) \ |
8185d5aa | 1786 | ide_tape_devset_get(_name, _field) \ |
92f1f8fd | 1787 | IDE_DEVSET(_name, 0, get_##_name, NULL) |
8185d5aa BZ |
1788 | |
1789 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
1790 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
1791 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
1792 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
1793 | ||
97100fc8 | 1794 | ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); |
92f1f8fd EO |
1795 | |
1796 | ide_tape_devset_rw_field(debug_mask, debug_mask); | |
1797 | ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); | |
1798 | ||
1799 | ide_tape_devset_r_field(avg_speed, avg_speed); | |
1800 | ide_tape_devset_r_field(speed, caps[14]); | |
1801 | ide_tape_devset_r_field(buffer, caps[16]); | |
1802 | ide_tape_devset_r_field(buffer_size, buffer_size); | |
1803 | ||
1804 | static const struct ide_proc_devset idetape_settings[] = { | |
1805 | __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), | |
1806 | __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), | |
1807 | __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), | |
1808 | __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), | |
1809 | __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), | |
1810 | __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), | |
1811 | __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
1812 | mulf_tdsc, divf_tdsc), | |
71bfc7a7 | 1813 | { NULL }, |
8185d5aa | 1814 | }; |
7662d046 | 1815 | #endif |
1da177e4 LT |
1816 | |
1817 | /* | |
3c98bf34 | 1818 | * The function below is called to: |
1da177e4 | 1819 | * |
3c98bf34 BP |
1820 | * 1. Initialize our various state variables. |
1821 | * 2. Ask the tape for its capabilities. | |
1822 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
1823 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 1824 | * |
3c98bf34 BP |
1825 | * Note that at this point ide.c already assigned us an irq, so that we can |
1826 | * queue requests here and wait for their completion. | |
1da177e4 | 1827 | */ |
5a04cfa9 | 1828 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 1829 | { |
83042b24 | 1830 | unsigned long t; |
1da177e4 | 1831 | int speed; |
f73850a3 | 1832 | int buffer_size; |
b6422013 | 1833 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 1834 | |
85e39035 | 1835 | drive->pc_callback = ide_tape_callback; |
776bb027 | 1836 | |
97100fc8 BZ |
1837 | drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; |
1838 | ||
4166c199 BZ |
1839 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
1840 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
1841 | tape->name); | |
97100fc8 | 1842 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 1843 | } |
97100fc8 | 1844 | |
1da177e4 | 1845 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 1846 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
97100fc8 BZ |
1847 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1848 | ||
1da177e4 LT |
1849 | tape->minor = minor; |
1850 | tape->name[0] = 'h'; | |
1851 | tape->name[1] = 't'; | |
1852 | tape->name[2] = '0' + minor; | |
54abf37e | 1853 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
4dde4492 | 1854 | |
1da177e4 LT |
1855 | idetape_get_inquiry_results(drive); |
1856 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 1857 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 1858 | tape->user_bs_factor = 1; |
f73850a3 BP |
1859 | tape->buffer_size = *ctl * tape->blk_size; |
1860 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 1861 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 1862 | *ctl /= 2; |
f73850a3 | 1863 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 1864 | } |
f73850a3 | 1865 | buffer_size = tape->buffer_size; |
1da177e4 | 1866 | |
83042b24 | 1867 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 1868 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 1869 | |
f73850a3 | 1870 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
1871 | |
1872 | /* | |
3c98bf34 BP |
1873 | * Ensure that the number we got makes sense; limit it within |
1874 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 1875 | */ |
a792bd5a HH |
1876 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
1877 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 1878 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 1879 | "%lums tDSC%s\n", |
b6422013 | 1880 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
1881 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
1882 | tape->buffer_size / 1024, | |
54bb2074 | 1883 | tape->best_dsc_rw_freq * 1000 / HZ, |
97100fc8 | 1884 | (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); |
1da177e4 | 1885 | |
1e874f44 | 1886 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
1887 | } |
1888 | ||
4031bbe4 | 1889 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
1890 | { |
1891 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1892 | |
7662d046 | 1893 | ide_proc_unregister_driver(drive, tape->driver); |
8fed4368 | 1894 | device_del(&tape->dev); |
1da177e4 LT |
1895 | ide_unregister_region(tape->disk); |
1896 | ||
8fed4368 BZ |
1897 | mutex_lock(&idetape_ref_mutex); |
1898 | put_device(&tape->dev); | |
1899 | mutex_unlock(&idetape_ref_mutex); | |
1da177e4 LT |
1900 | } |
1901 | ||
8fed4368 | 1902 | static void ide_tape_release(struct device *dev) |
1da177e4 | 1903 | { |
8fed4368 | 1904 | struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); |
1da177e4 LT |
1905 | ide_drive_t *drive = tape->drive; |
1906 | struct gendisk *g = tape->disk; | |
1907 | ||
963da55c | 1908 | BUG_ON(tape->valid); |
8604affd | 1909 | |
97100fc8 | 1910 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 1911 | drive->driver_data = NULL; |
dbc1272e | 1912 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
1913 | device_destroy(idetape_sysfs_class, |
1914 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
1915 | idetape_devs[tape->minor] = NULL; |
1916 | g->private_data = NULL; | |
1917 | put_disk(g); | |
1918 | kfree(tape); | |
1919 | } | |
1920 | ||
ecfd80e4 | 1921 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
1922 | static int proc_idetape_read_name |
1923 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
1924 | { | |
1925 | ide_drive_t *drive = (ide_drive_t *) data; | |
1926 | idetape_tape_t *tape = drive->driver_data; | |
1927 | char *out = page; | |
1928 | int len; | |
1929 | ||
1930 | len = sprintf(out, "%s\n", tape->name); | |
1931 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
1932 | } | |
1933 | ||
1934 | static ide_proc_entry_t idetape_proc[] = { | |
1935 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
1936 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
1937 | { NULL, 0, NULL, NULL } | |
1938 | }; | |
79cb3803 BZ |
1939 | |
1940 | static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) | |
1941 | { | |
1942 | return idetape_proc; | |
1943 | } | |
1944 | ||
1945 | static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) | |
1946 | { | |
1947 | return idetape_settings; | |
1948 | } | |
1da177e4 LT |
1949 | #endif |
1950 | ||
4031bbe4 | 1951 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 1952 | |
7f3c868b | 1953 | static struct ide_driver idetape_driver = { |
8604affd | 1954 | .gen_driver = { |
4ef3b8f4 | 1955 | .owner = THIS_MODULE, |
8604affd BZ |
1956 | .name = "ide-tape", |
1957 | .bus = &ide_bus_type, | |
8604affd | 1958 | }, |
4031bbe4 RK |
1959 | .probe = ide_tape_probe, |
1960 | .remove = ide_tape_remove, | |
1da177e4 | 1961 | .version = IDETAPE_VERSION, |
1da177e4 | 1962 | .do_request = idetape_do_request, |
7662d046 | 1963 | #ifdef CONFIG_IDE_PROC_FS |
79cb3803 BZ |
1964 | .proc_entries = ide_tape_proc_entries, |
1965 | .proc_devsets = ide_tape_proc_devsets, | |
7662d046 | 1966 | #endif |
1da177e4 LT |
1967 | }; |
1968 | ||
3c98bf34 | 1969 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 1970 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
1971 | .owner = THIS_MODULE, |
1972 | .read = idetape_chrdev_read, | |
1973 | .write = idetape_chrdev_write, | |
1974 | .ioctl = idetape_chrdev_ioctl, | |
1975 | .open = idetape_chrdev_open, | |
1976 | .release = idetape_chrdev_release, | |
1977 | }; | |
1978 | ||
a4600f81 | 1979 | static int idetape_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 1980 | { |
a4600f81 | 1981 | struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk); |
1da177e4 | 1982 | |
5a04cfa9 | 1983 | if (!tape) |
1da177e4 LT |
1984 | return -ENXIO; |
1985 | ||
1da177e4 LT |
1986 | return 0; |
1987 | } | |
1988 | ||
a4600f81 | 1989 | static int idetape_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 1990 | { |
5aeddf90 | 1991 | struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); |
1da177e4 LT |
1992 | |
1993 | ide_tape_put(tape); | |
1da177e4 LT |
1994 | return 0; |
1995 | } | |
1996 | ||
a4600f81 | 1997 | static int idetape_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
1998 | unsigned int cmd, unsigned long arg) |
1999 | { | |
5aeddf90 | 2000 | struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); |
1da177e4 | 2001 | ide_drive_t *drive = tape->drive; |
1bddd9e6 | 2002 | int err = generic_ide_ioctl(drive, bdev, cmd, arg); |
1da177e4 LT |
2003 | if (err == -EINVAL) |
2004 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2005 | return err; | |
2006 | } | |
2007 | ||
2008 | static struct block_device_operations idetape_block_ops = { | |
2009 | .owner = THIS_MODULE, | |
a4600f81 AV |
2010 | .open = idetape_open, |
2011 | .release = idetape_release, | |
2012 | .locked_ioctl = idetape_ioctl, | |
1da177e4 LT |
2013 | }; |
2014 | ||
4031bbe4 | 2015 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2016 | { |
2017 | idetape_tape_t *tape; | |
2018 | struct gendisk *g; | |
2019 | int minor; | |
2020 | ||
2021 | if (!strstr("ide-tape", drive->driver_req)) | |
2022 | goto failed; | |
2a924662 | 2023 | |
1da177e4 LT |
2024 | if (drive->media != ide_tape) |
2025 | goto failed; | |
2a924662 | 2026 | |
97100fc8 BZ |
2027 | if ((drive->dev_flags & IDE_DFLAG_ID_READ) && |
2028 | ide_check_atapi_device(drive, DRV_NAME) == 0) { | |
5a04cfa9 BP |
2029 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
2030 | " the driver\n", drive->name); | |
1da177e4 LT |
2031 | goto failed; |
2032 | } | |
5a04cfa9 | 2033 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2034 | if (tape == NULL) { |
5a04cfa9 BP |
2035 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2036 | drive->name); | |
1da177e4 LT |
2037 | goto failed; |
2038 | } | |
2039 | ||
2040 | g = alloc_disk(1 << PARTN_BITS); | |
2041 | if (!g) | |
2042 | goto out_free_tape; | |
2043 | ||
2044 | ide_init_disk(g, drive); | |
2045 | ||
8fed4368 BZ |
2046 | tape->dev.parent = &drive->gendev; |
2047 | tape->dev.release = ide_tape_release; | |
2048 | dev_set_name(&tape->dev, dev_name(&drive->gendev)); | |
2049 | ||
2050 | if (device_register(&tape->dev)) | |
2051 | goto out_free_disk; | |
1da177e4 LT |
2052 | |
2053 | tape->drive = drive; | |
2054 | tape->driver = &idetape_driver; | |
2055 | tape->disk = g; | |
2056 | ||
2057 | g->private_data = &tape->driver; | |
2058 | ||
2059 | drive->driver_data = tape; | |
2060 | ||
cf8b8975 | 2061 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2062 | for (minor = 0; idetape_devs[minor]; minor++) |
2063 | ; | |
2064 | idetape_devs[minor] = tape; | |
cf8b8975 | 2065 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2066 | |
2067 | idetape_setup(drive, tape, minor); | |
2068 | ||
3ee074bf GKH |
2069 | device_create(idetape_sysfs_class, &drive->gendev, |
2070 | MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); | |
2071 | device_create(idetape_sysfs_class, &drive->gendev, | |
2072 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
2073 | "n%s", tape->name); | |
d5dee80a | 2074 | |
1da177e4 LT |
2075 | g->fops = &idetape_block_ops; |
2076 | ide_register_region(g); | |
2077 | ||
2078 | return 0; | |
8604affd | 2079 | |
8fed4368 BZ |
2080 | out_free_disk: |
2081 | put_disk(g); | |
1da177e4 LT |
2082 | out_free_tape: |
2083 | kfree(tape); | |
2084 | failed: | |
8604affd | 2085 | return -ENODEV; |
1da177e4 LT |
2086 | } |
2087 | ||
5a04cfa9 | 2088 | static void __exit idetape_exit(void) |
1da177e4 | 2089 | { |
8604affd | 2090 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2091 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2092 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2093 | } | |
2094 | ||
17514e8a | 2095 | static int __init idetape_init(void) |
1da177e4 | 2096 | { |
d5dee80a WD |
2097 | int error = 1; |
2098 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2099 | if (IS_ERR(idetape_sysfs_class)) { | |
2100 | idetape_sysfs_class = NULL; | |
2101 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2102 | error = -EBUSY; | |
2103 | goto out; | |
2104 | } | |
2105 | ||
1da177e4 | 2106 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2107 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2108 | " interface\n"); | |
d5dee80a WD |
2109 | error = -EBUSY; |
2110 | goto out_free_class; | |
1da177e4 | 2111 | } |
d5dee80a WD |
2112 | |
2113 | error = driver_register(&idetape_driver.gen_driver); | |
2114 | if (error) | |
2115 | goto out_free_driver; | |
2116 | ||
2117 | return 0; | |
2118 | ||
2119 | out_free_driver: | |
2120 | driver_unregister(&idetape_driver.gen_driver); | |
2121 | out_free_class: | |
2122 | class_destroy(idetape_sysfs_class); | |
2123 | out: | |
2124 | return error; | |
1da177e4 LT |
2125 | } |
2126 | ||
263756ec | 2127 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2128 | module_init(idetape_init); |
2129 | module_exit(idetape_exit); | |
2130 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2131 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2132 | MODULE_LICENSE("GPL"); |