Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
5ce78af4 BP |
2 | * IDE ATAPI streaming tape driver. |
3 | * | |
59bca8cc BZ |
4 | * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> |
5 | * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz | |
1da177e4 | 6 | * |
1da177e4 LT |
7 | * This driver was constructed as a student project in the software laboratory |
8 | * of the faculty of electrical engineering in the Technion - Israel's | |
9 | * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. | |
10 | * | |
11 | * It is hereby placed under the terms of the GNU general public license. | |
12 | * (See linux/COPYING). | |
1da177e4 | 13 | * |
5ce78af4 BP |
14 | * For a historical changelog see |
15 | * Documentation/ide/ChangeLog.ide-tape.1995-2002 | |
1da177e4 LT |
16 | */ |
17 | ||
51509eec BZ |
18 | #define DRV_NAME "ide-tape" |
19 | ||
dfe79936 | 20 | #define IDETAPE_VERSION "1.20" |
1da177e4 | 21 | |
1da177e4 LT |
22 | #include <linux/module.h> |
23 | #include <linux/types.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/timer.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/interrupt.h> | |
9bae1ff3 | 30 | #include <linux/jiffies.h> |
1da177e4 | 31 | #include <linux/major.h> |
1da177e4 LT |
32 | #include <linux/errno.h> |
33 | #include <linux/genhd.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/pci.h> | |
36 | #include <linux/ide.h> | |
37 | #include <linux/smp_lock.h> | |
38 | #include <linux/completion.h> | |
39 | #include <linux/bitops.h> | |
cf8b8975 | 40 | #include <linux/mutex.h> |
90699ce2 | 41 | #include <scsi/scsi.h> |
1da177e4 LT |
42 | |
43 | #include <asm/byteorder.h> | |
c837cfa5 BP |
44 | #include <linux/irq.h> |
45 | #include <linux/uaccess.h> | |
46 | #include <linux/io.h> | |
1da177e4 | 47 | #include <asm/unaligned.h> |
1da177e4 LT |
48 | #include <linux/mtio.h> |
49 | ||
8004a8c9 | 50 | /* define to see debug info */ |
e972d702 | 51 | #undef IDETAPE_DEBUG_LOG |
8004a8c9 | 52 | |
e972d702 BP |
53 | #ifdef IDETAPE_DEBUG_LOG |
54 | #define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, ## args) | |
8004a8c9 | 55 | #else |
e972d702 | 56 | #define ide_debug_log(lvl, fmt, args...) do {} while (0) |
8004a8c9 BP |
57 | #endif |
58 | ||
1da177e4 | 59 | /**************************** Tunable parameters *****************************/ |
1da177e4 | 60 | /* |
3c98bf34 BP |
61 | * After each failed packet command we issue a request sense command and retry |
62 | * the packet command IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 63 | * |
3c98bf34 | 64 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
1da177e4 LT |
65 | */ |
66 | #define IDETAPE_MAX_PC_RETRIES 3 | |
67 | ||
1da177e4 | 68 | /* |
3c98bf34 BP |
69 | * The following parameter is used to select the point in the internal tape fifo |
70 | * in which we will start to refill the buffer. Decreasing the following | |
71 | * parameter will improve the system's latency and interactive response, while | |
72 | * using a high value might improve system throughput. | |
1da177e4 | 73 | */ |
3c98bf34 | 74 | #define IDETAPE_FIFO_THRESHOLD 2 |
1da177e4 LT |
75 | |
76 | /* | |
3c98bf34 | 77 | * DSC polling parameters. |
1da177e4 | 78 | * |
3c98bf34 BP |
79 | * Polling for DSC (a single bit in the status register) is a very important |
80 | * function in ide-tape. There are two cases in which we poll for DSC: | |
1da177e4 | 81 | * |
3c98bf34 BP |
82 | * 1. Before a read/write packet command, to ensure that we can transfer data |
83 | * from/to the tape's data buffers, without causing an actual media access. | |
84 | * In case the tape is not ready yet, we take out our request from the device | |
85 | * request queue, so that ide.c could service requests from the other device | |
86 | * on the same interface in the meantime. | |
1da177e4 | 87 | * |
3c98bf34 BP |
88 | * 2. After the successful initialization of a "media access packet command", |
89 | * which is a command that can take a long time to complete (the interval can | |
90 | * range from several seconds to even an hour). Again, we postpone our request | |
91 | * in the middle to free the bus for the other device. The polling frequency | |
92 | * here should be lower than the read/write frequency since those media access | |
93 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST | |
94 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD | |
95 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). | |
1da177e4 | 96 | * |
3c98bf34 BP |
97 | * We also set a timeout for the timer, in case something goes wrong. The |
98 | * timeout should be longer then the maximum execution time of a tape operation. | |
1da177e4 | 99 | */ |
3c98bf34 BP |
100 | |
101 | /* DSC timings. */ | |
1da177e4 LT |
102 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
103 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ | |
104 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ | |
105 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ | |
106 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ | |
107 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ | |
108 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ | |
109 | ||
110 | /*************************** End of tunable parameters ***********************/ | |
111 | ||
54abf37e BP |
112 | /* tape directions */ |
113 | enum { | |
114 | IDETAPE_DIR_NONE = (1 << 0), | |
115 | IDETAPE_DIR_READ = (1 << 1), | |
116 | IDETAPE_DIR_WRITE = (1 << 2), | |
117 | }; | |
1da177e4 | 118 | |
03056b90 BP |
119 | /* Tape door status */ |
120 | #define DOOR_UNLOCKED 0 | |
121 | #define DOOR_LOCKED 1 | |
122 | #define DOOR_EXPLICITLY_LOCKED 2 | |
123 | ||
124 | /* Some defines for the SPACE command */ | |
125 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
126 | #define IDETAPE_SPACE_TO_EOD 3 | |
127 | ||
128 | /* Some defines for the LOAD UNLOAD command */ | |
129 | #define IDETAPE_LU_LOAD_MASK 1 | |
130 | #define IDETAPE_LU_RETENSION_MASK 2 | |
131 | #define IDETAPE_LU_EOT_MASK 4 | |
132 | ||
03056b90 BP |
133 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ |
134 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
135 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
136 | ||
1da177e4 | 137 | /* |
3c98bf34 BP |
138 | * Most of our global data which we need to save even as we leave the driver due |
139 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
140 | */ |
141 | typedef struct ide_tape_obj { | |
7f3c868b BZ |
142 | ide_drive_t *drive; |
143 | struct ide_driver *driver; | |
144 | struct gendisk *disk; | |
8fed4368 | 145 | struct device dev; |
1da177e4 | 146 | |
2e8a6f89 BZ |
147 | /* used by REQ_IDETAPE_{READ,WRITE} requests */ |
148 | struct ide_atapi_pc queued_pc; | |
394a4c21 | 149 | |
1da177e4 | 150 | /* |
3c98bf34 | 151 | * DSC polling variables. |
1da177e4 | 152 | * |
3c98bf34 BP |
153 | * While polling for DSC we use postponed_rq to postpone the current |
154 | * request so that ide.c will be able to service pending requests on the | |
155 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 156 | * data transfer) request in the device request queue. |
1da177e4 | 157 | */ |
6f3848ac BP |
158 | bool postponed_rq; |
159 | ||
1da177e4 LT |
160 | /* The time in which we started polling for DSC */ |
161 | unsigned long dsc_polling_start; | |
162 | /* Timer used to poll for dsc */ | |
163 | struct timer_list dsc_timer; | |
164 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
165 | unsigned long best_dsc_rw_freq; |
166 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
167 | unsigned long dsc_timeout; |
168 | ||
3c98bf34 | 169 | /* Read position information */ |
1da177e4 LT |
170 | u8 partition; |
171 | /* Current block */ | |
54bb2074 | 172 | unsigned int first_frame; |
1da177e4 | 173 | |
3c98bf34 | 174 | /* Last error information */ |
1da177e4 LT |
175 | u8 sense_key, asc, ascq; |
176 | ||
3c98bf34 | 177 | /* Character device operation */ |
1da177e4 LT |
178 | unsigned int minor; |
179 | /* device name */ | |
180 | char name[4]; | |
181 | /* Current character device data transfer direction */ | |
54abf37e | 182 | u8 chrdev_dir; |
1da177e4 | 183 | |
54bb2074 BP |
184 | /* tape block size, usually 512 or 1024 bytes */ |
185 | unsigned short blk_size; | |
1da177e4 | 186 | int user_bs_factor; |
b6422013 | 187 | |
1da177e4 | 188 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 189 | u8 caps[20]; |
1da177e4 LT |
190 | |
191 | /* | |
3c98bf34 | 192 | * Active data transfer request parameters. |
1da177e4 | 193 | * |
3c98bf34 BP |
194 | * At most, there is only one ide-tape originated data transfer request |
195 | * in the device request queue. This allows ide.c to easily service | |
196 | * requests from the other device when we postpone our active request. | |
1da177e4 | 197 | */ |
83042b24 | 198 | |
3c98bf34 | 199 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 200 | int buffer_size; |
963da55c TH |
201 | /* Staging buffer of buffer_size bytes */ |
202 | void *buf; | |
203 | /* The read/write cursor */ | |
204 | void *cur; | |
205 | /* The number of valid bytes in buf */ | |
206 | size_t valid; | |
3c98bf34 | 207 | |
3c98bf34 | 208 | /* Measures average tape speed */ |
1da177e4 LT |
209 | unsigned long avg_time; |
210 | int avg_size; | |
211 | int avg_speed; | |
212 | ||
1da177e4 LT |
213 | /* the door is currently locked */ |
214 | int door_locked; | |
215 | /* the tape hardware is write protected */ | |
216 | char drv_write_prot; | |
217 | /* the tape is write protected (hardware or opened as read-only) */ | |
218 | char write_prot; | |
1da177e4 LT |
219 | } idetape_tape_t; |
220 | ||
cf8b8975 | 221 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 222 | |
d5dee80a WD |
223 | static struct class *idetape_sysfs_class; |
224 | ||
8fed4368 | 225 | static void ide_tape_release(struct device *); |
08da591e | 226 | |
9d01e4cd BP |
227 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
228 | ||
229 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev, | |
230 | unsigned int i) | |
1da177e4 LT |
231 | { |
232 | struct ide_tape_obj *tape = NULL; | |
233 | ||
cf8b8975 | 234 | mutex_lock(&idetape_ref_mutex); |
9d01e4cd BP |
235 | |
236 | if (cdev) | |
237 | tape = idetape_devs[i]; | |
238 | else | |
239 | tape = ide_drv_g(disk, ide_tape_obj); | |
240 | ||
08da591e | 241 | if (tape) { |
d3e33ff5 | 242 | if (ide_device_get(tape->drive)) |
08da591e | 243 | tape = NULL; |
d3e33ff5 | 244 | else |
8fed4368 | 245 | get_device(&tape->dev); |
08da591e | 246 | } |
9d01e4cd | 247 | |
cf8b8975 | 248 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
249 | return tape; |
250 | } | |
251 | ||
1da177e4 LT |
252 | static void ide_tape_put(struct ide_tape_obj *tape) |
253 | { | |
d3e33ff5 BZ |
254 | ide_drive_t *drive = tape->drive; |
255 | ||
cf8b8975 | 256 | mutex_lock(&idetape_ref_mutex); |
8fed4368 | 257 | put_device(&tape->dev); |
d3e33ff5 | 258 | ide_device_put(drive); |
cf8b8975 | 259 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
260 | } |
261 | ||
1da177e4 | 262 | /* |
1b5db434 BP |
263 | * called on each failed packet command retry to analyze the request sense. We |
264 | * currently do not utilize this information. | |
1da177e4 | 265 | */ |
ae3a8387 | 266 | static void idetape_analyze_error(ide_drive_t *drive) |
1da177e4 LT |
267 | { |
268 | idetape_tape_t *tape = drive->driver_data; | |
5e2040fd | 269 | struct ide_atapi_pc *pc = drive->failed_pc; |
dfb7e621 | 270 | struct request *rq = drive->hwif->rq; |
ae3a8387 | 271 | u8 *sense = bio_data(rq->bio); |
1da177e4 | 272 | |
1b5db434 BP |
273 | tape->sense_key = sense[2] & 0xF; |
274 | tape->asc = sense[12]; | |
275 | tape->ascq = sense[13]; | |
8004a8c9 | 276 | |
e972d702 BP |
277 | ide_debug_log(IDE_DBG_FUNC, |
278 | "cmd: 0x%x, sense key = %x, asc = %x, ascq = %x", | |
279 | rq->cmd[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 280 | |
077e6dba | 281 | /* correct remaining bytes to transfer */ |
21d9c5d2 | 282 | if (pc->flags & PC_FLAG_DMA_ERROR) |
077e6dba | 283 | rq->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]); |
1da177e4 LT |
284 | |
285 | /* | |
286 | * If error was the result of a zero-length read or write command, | |
287 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
288 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
289 | */ | |
90699ce2 | 290 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
291 | /* length == 0 */ |
292 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
293 | if (tape->sense_key == 5) { | |
1da177e4 LT |
294 | /* don't report an error, everything's ok */ |
295 | pc->error = 0; | |
296 | /* don't retry read/write */ | |
346331f8 | 297 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
298 | } |
299 | } | |
90699ce2 | 300 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
c152cc1a | 301 | pc->error = IDE_DRV_ERROR_FILEMARK; |
346331f8 | 302 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 303 | } |
90699ce2 | 304 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
305 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
306 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
c152cc1a | 307 | pc->error = IDE_DRV_ERROR_EOD; |
346331f8 | 308 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
309 | } |
310 | } | |
90699ce2 | 311 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 312 | if (tape->sense_key == 8) { |
c152cc1a | 313 | pc->error = IDE_DRV_ERROR_EOD; |
346331f8 | 314 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 315 | } |
346331f8 | 316 | if (!(pc->flags & PC_FLAG_ABORT) && |
077e6dba | 317 | (blk_rq_bytes(rq) - rq->resid_len)) |
1da177e4 LT |
318 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
319 | } | |
320 | } | |
321 | ||
b14c7212 BZ |
322 | static void ide_tape_handle_dsc(ide_drive_t *); |
323 | ||
03a2faae | 324 | static int ide_tape_callback(ide_drive_t *drive, int dsc) |
1da177e4 LT |
325 | { |
326 | idetape_tape_t *tape = drive->driver_data; | |
2b9efba4 | 327 | struct ide_atapi_pc *pc = drive->pc; |
313afea7 | 328 | struct request *rq = drive->hwif->rq; |
5985e6ab | 329 | int uptodate = pc->error ? 0 : 1; |
313afea7 | 330 | int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; |
1da177e4 | 331 | |
e972d702 BP |
332 | ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc: %d, err: %d", rq->cmd[0], |
333 | dsc, err); | |
8004a8c9 | 334 | |
b14c7212 BZ |
335 | if (dsc) |
336 | ide_tape_handle_dsc(drive); | |
337 | ||
5e2040fd BZ |
338 | if (drive->failed_pc == pc) |
339 | drive->failed_pc = NULL; | |
dd2e9a03 | 340 | |
5985e6ab BZ |
341 | if (pc->c[0] == REQUEST_SENSE) { |
342 | if (uptodate) | |
ae3a8387 | 343 | idetape_analyze_error(drive); |
5985e6ab BZ |
344 | else |
345 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
346 | "itself - Aborting request!\n"); | |
347 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
077e6dba BP |
348 | unsigned int blocks = |
349 | (blk_rq_bytes(rq) - rq->resid_len) / tape->blk_size; | |
5985e6ab BZ |
350 | |
351 | tape->avg_size += blocks * tape->blk_size; | |
352 | ||
353 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
354 | tape->avg_speed = tape->avg_size * HZ / | |
355 | (jiffies - tape->avg_time) / 1024; | |
356 | tape->avg_size = 0; | |
357 | tape->avg_time = jiffies; | |
358 | } | |
359 | ||
360 | tape->first_frame += blocks; | |
5985e6ab | 361 | |
313afea7 BZ |
362 | if (pc->error) { |
363 | uptodate = 0; | |
364 | err = pc->error; | |
365 | } | |
1da177e4 | 366 | } |
313afea7 BZ |
367 | rq->errors = err; |
368 | ||
03a2faae | 369 | return uptodate; |
1da177e4 LT |
370 | } |
371 | ||
1da177e4 | 372 | /* |
3c98bf34 | 373 | * Postpone the current request so that ide.c will be able to service requests |
b65fac32 | 374 | * from another device on the same port while we are polling for DSC. |
1da177e4 | 375 | */ |
6f3848ac | 376 | static void ide_tape_stall_queue(ide_drive_t *drive) |
1da177e4 LT |
377 | { |
378 | idetape_tape_t *tape = drive->driver_data; | |
379 | ||
e972d702 | 380 | ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc_poll_freq: %lu", |
6f3848ac | 381 | drive->hwif->rq->cmd[0], tape->dsc_poll_freq); |
8004a8c9 | 382 | |
6f3848ac | 383 | tape->postponed_rq = true; |
b65fac32 | 384 | |
54bb2074 | 385 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
386 | } |
387 | ||
74e63e74 BZ |
388 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
389 | { | |
390 | idetape_tape_t *tape = drive->driver_data; | |
391 | ||
392 | /* Media access command */ | |
393 | tape->dsc_polling_start = jiffies; | |
394 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
395 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
396 | /* Allow ide.c to handle other requests */ | |
6f3848ac | 397 | ide_tape_stall_queue(drive); |
74e63e74 BZ |
398 | } |
399 | ||
1da177e4 | 400 | /* |
3c98bf34 | 401 | * Packet Command Interface |
1da177e4 | 402 | * |
2b9efba4 | 403 | * The current Packet Command is available in drive->pc, and will not change |
3c98bf34 BP |
404 | * until we finish handling it. Each packet command is associated with a |
405 | * callback function that will be called when the command is finished. | |
1da177e4 | 406 | * |
3c98bf34 | 407 | * The handling will be done in three stages: |
1da177e4 | 408 | * |
b788ee9c | 409 | * 1. ide_tape_issue_pc will send the packet command to the drive, and will set |
aa5d2de7 | 410 | * the interrupt handler to ide_pc_intr. |
1da177e4 | 411 | * |
aa5d2de7 | 412 | * 2. On each interrupt, ide_pc_intr will be called. This step will be |
3c98bf34 | 413 | * repeated until the device signals us that no more interrupts will be issued. |
1da177e4 | 414 | * |
3c98bf34 BP |
415 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
416 | * process. In case of a successful initiation of a media access packet command, | |
417 | * the DSC bit will be set when the actual execution of the command is finished. | |
418 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
419 | * event. In this case, we define the request as "low priority request" by | |
420 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
421 | * exit the driver. | |
1da177e4 | 422 | * |
3c98bf34 BP |
423 | * ide.c will then give higher priority to requests which originate from the |
424 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 425 | * |
3c98bf34 | 426 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 427 | * |
3c98bf34 BP |
428 | * 5. In case an error was found, we queue a request sense packet command in |
429 | * front of the request queue and retry the operation up to | |
430 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 431 | * |
3c98bf34 BP |
432 | * 6. In case no error was found, or we decided to give up and not to retry |
433 | * again, the callback function will be called and then we will handle the next | |
434 | * request. | |
1da177e4 | 435 | */ |
1da177e4 | 436 | |
b788ee9c BZ |
437 | static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, |
438 | struct ide_cmd *cmd, | |
439 | struct ide_atapi_pc *pc) | |
1da177e4 | 440 | { |
1da177e4 | 441 | idetape_tape_t *tape = drive->driver_data; |
dfb7e621 | 442 | struct request *rq = drive->hwif->rq; |
1da177e4 | 443 | |
5e2040fd BZ |
444 | if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
445 | drive->failed_pc = pc; | |
2b9efba4 | 446 | |
1da177e4 | 447 | /* Set the current packet command */ |
2b9efba4 | 448 | drive->pc = pc; |
1da177e4 LT |
449 | |
450 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 451 | (pc->flags & PC_FLAG_ABORT)) { |
b3071d19 | 452 | |
1da177e4 | 453 | /* |
3c98bf34 BP |
454 | * We will "abort" retrying a packet command in case legitimate |
455 | * error code was received (crossing a filemark, or end of the | |
456 | * media, for example). | |
1da177e4 | 457 | */ |
346331f8 | 458 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 459 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
460 | tape->sense_key == 2 && tape->asc == 4 && |
461 | (tape->ascq == 1 || tape->ascq == 8))) { | |
462 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
463 | "pc = %2x, key = %2x, " | |
464 | "asc = %2x, ascq = %2x\n", | |
465 | tape->name, pc->c[0], | |
466 | tape->sense_key, tape->asc, | |
467 | tape->ascq); | |
468 | } | |
469 | /* Giving up */ | |
c152cc1a | 470 | pc->error = IDE_DRV_ERROR_GENERAL; |
1da177e4 | 471 | } |
b3071d19 | 472 | |
5e2040fd | 473 | drive->failed_pc = NULL; |
b14c7212 | 474 | drive->pc_callback(drive, 0); |
dfb7e621 | 475 | ide_complete_rq(drive, -EIO, blk_rq_bytes(rq)); |
92f5daff | 476 | return ide_stopped; |
1da177e4 | 477 | } |
e972d702 BP |
478 | ide_debug_log(IDE_DBG_SENSE, "retry #%d, cmd: 0x%02x", pc->retries, |
479 | pc->c[0]); | |
1da177e4 LT |
480 | |
481 | pc->retries++; | |
1da177e4 | 482 | |
b788ee9c | 483 | return ide_issue_pc(drive, cmd); |
1da177e4 LT |
484 | } |
485 | ||
3c98bf34 | 486 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 487 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 | 488 | { |
7bf7420a | 489 | ide_init_pc(pc); |
90699ce2 | 490 | pc->c[0] = MODE_SENSE; |
1da177e4 | 491 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
492 | /* DBD = 1 - Don't return block descriptors */ |
493 | pc->c[1] = 8; | |
1da177e4 LT |
494 | pc->c[2] = page_code; |
495 | /* | |
496 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
497 | * | |
498 | * For SCSI this byte is defined as subpage instead of high byte | |
499 | * of length and some IDE drives seem to interpret it this way | |
500 | * and return an error when 255 is used. | |
501 | */ | |
502 | pc->c[3] = 0; | |
3c98bf34 BP |
503 | /* We will just discard data in that case */ |
504 | pc->c[4] = 255; | |
1da177e4 | 505 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 506 | pc->req_xfer = 12; |
1da177e4 | 507 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 508 | pc->req_xfer = 24; |
1da177e4 | 509 | else |
d236d74c | 510 | pc->req_xfer = 50; |
1da177e4 LT |
511 | } |
512 | ||
5a04cfa9 | 513 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 514 | { |
b73c7ee2 | 515 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 516 | idetape_tape_t *tape = drive->driver_data; |
2b9efba4 | 517 | struct ide_atapi_pc *pc = drive->pc; |
22c525b9 | 518 | u8 stat; |
1da177e4 | 519 | |
374e042c | 520 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 521 | |
3a7d2484 BZ |
522 | if (stat & ATA_DSC) { |
523 | if (stat & ATA_ERR) { | |
1da177e4 | 524 | /* Error detected */ |
90699ce2 | 525 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
526 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
527 | tape->name); | |
528 | /* Retry operation */ | |
6b544fcc | 529 | ide_retry_pc(drive); |
258ec411 | 530 | return ide_stopped; |
1da177e4 LT |
531 | } |
532 | pc->error = 0; | |
1da177e4 | 533 | } else { |
c152cc1a | 534 | pc->error = IDE_DRV_ERROR_GENERAL; |
5e2040fd | 535 | drive->failed_pc = NULL; |
1da177e4 | 536 | } |
b14c7212 | 537 | drive->pc_callback(drive, 0); |
1da177e4 LT |
538 | return ide_stopped; |
539 | } | |
540 | ||
cd2abbfe | 541 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
542 | struct ide_atapi_pc *pc, struct request *rq, |
543 | u8 opcode) | |
1da177e4 | 544 | { |
10c0b343 | 545 | unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9); |
0014c75b | 546 | |
7bf7420a | 547 | ide_init_pc(pc); |
860ff5ec | 548 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 549 | pc->c[1] = 1; |
19f52a78 BP |
550 | |
551 | if (blk_rq_bytes(rq) == tape->buffer_size) | |
5e331095 | 552 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 553 | |
963da55c | 554 | if (opcode == READ_6) |
cd2abbfe | 555 | pc->c[0] = READ_6; |
963da55c | 556 | else if (opcode == WRITE_6) { |
cd2abbfe BP |
557 | pc->c[0] = WRITE_6; |
558 | pc->flags |= PC_FLAG_WRITING; | |
cd2abbfe | 559 | } |
0014c75b BP |
560 | |
561 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
562 | } |
563 | ||
1da177e4 LT |
564 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
565 | struct request *rq, sector_t block) | |
566 | { | |
b73c7ee2 | 567 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 568 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 569 | struct ide_atapi_pc *pc = NULL; |
b788ee9c | 570 | struct ide_cmd cmd; |
22c525b9 | 571 | u8 stat; |
1da177e4 | 572 | |
e972d702 BP |
573 | ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, sector: %llu, nr_sectors: %u", |
574 | rq->cmd[0], (unsigned long long)blk_rq_pos(rq), | |
575 | blk_rq_sectors(rq)); | |
1da177e4 | 576 | |
2c7eaa43 | 577 | BUG_ON(!(blk_special_request(rq) || blk_sense_request(rq))); |
1da177e4 | 578 | |
3c98bf34 | 579 | /* Retry a failed packet command */ |
5e2040fd BZ |
580 | if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { |
581 | pc = drive->failed_pc; | |
28c7214b BZ |
582 | goto out; |
583 | } | |
5a04cfa9 | 584 | |
1da177e4 LT |
585 | /* |
586 | * If the tape is still busy, postpone our request and service | |
587 | * the other device meanwhile. | |
588 | */ | |
374e042c | 589 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 590 | |
97100fc8 BZ |
591 | if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && |
592 | (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) | |
626542ca | 593 | drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; |
1da177e4 | 594 | |
97100fc8 | 595 | if (drive->dev_flags & IDE_DFLAG_POST_RESET) { |
626542ca | 596 | drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; |
97100fc8 | 597 | drive->dev_flags &= ~IDE_DFLAG_POST_RESET; |
1da177e4 LT |
598 | } |
599 | ||
626542ca BP |
600 | if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) && |
601 | !(stat & ATA_DSC)) { | |
6f3848ac | 602 | if (!tape->postponed_rq) { |
1da177e4 | 603 | tape->dsc_polling_start = jiffies; |
54bb2074 | 604 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
605 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
606 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
607 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
608 | tape->name); | |
83dd5735 | 609 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
610 | idetape_media_access_finished(drive); |
611 | return ide_stopped; | |
612 | } else { | |
613 | return ide_do_reset(drive); | |
614 | } | |
5a04cfa9 BP |
615 | } else if (time_after(jiffies, |
616 | tape->dsc_polling_start + | |
617 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 618 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
6f3848ac | 619 | ide_tape_stall_queue(drive); |
1da177e4 | 620 | return ide_stopped; |
6f3848ac | 621 | } else { |
626542ca | 622 | drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC; |
6f3848ac BP |
623 | tape->postponed_rq = false; |
624 | } | |
626542ca | 625 | |
83dd5735 | 626 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
2e8a6f89 | 627 | pc = &tape->queued_pc; |
0014c75b | 628 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
629 | goto out; |
630 | } | |
83dd5735 | 631 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
2e8a6f89 | 632 | pc = &tape->queued_pc; |
0014c75b | 633 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
634 | goto out; |
635 | } | |
83dd5735 | 636 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
c267cc1c | 637 | pc = (struct ide_atapi_pc *)rq->special; |
83dd5735 BP |
638 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
639 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
640 | goto out; |
641 | } | |
83dd5735 | 642 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
643 | idetape_media_access_finished(drive); |
644 | return ide_stopped; | |
645 | } | |
646 | BUG(); | |
28c7214b | 647 | |
f2e3ab52 | 648 | out: |
6b544fcc BP |
649 | /* prepare sense request for this command */ |
650 | ide_prep_sense(drive, rq); | |
651 | ||
b788ee9c BZ |
652 | memset(&cmd, 0, sizeof(cmd)); |
653 | ||
654 | if (rq_data_dir(rq)) | |
655 | cmd.tf_flags |= IDE_TFLAG_WRITE; | |
656 | ||
657 | cmd.rq = rq; | |
658 | ||
dfb7e621 | 659 | ide_init_sg_cmd(&cmd, blk_rq_bytes(rq)); |
5c4be572 TH |
660 | ide_map_sg(drive, &cmd); |
661 | ||
b788ee9c | 662 | return ide_tape_issue_pc(drive, &cmd, pc); |
1da177e4 LT |
663 | } |
664 | ||
1da177e4 | 665 | /* |
3c98bf34 BP |
666 | * Write a filemark if write_filemark=1. Flush the device buffers without |
667 | * writing a filemark otherwise. | |
1da177e4 | 668 | */ |
5a04cfa9 | 669 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 670 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 | 671 | { |
7bf7420a | 672 | ide_init_pc(pc); |
90699ce2 | 673 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 674 | pc->c[4] = write_filemark; |
346331f8 | 675 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
676 | } |
677 | ||
1da177e4 LT |
678 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
679 | { | |
680 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 681 | struct gendisk *disk = tape->disk; |
1da177e4 LT |
682 | int load_attempted = 0; |
683 | ||
3c98bf34 | 684 | /* Wait for the tape to become ready */ |
49d8078a | 685 | set_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), &drive->atapi_flags); |
1da177e4 LT |
686 | timeout += jiffies; |
687 | while (time_before(jiffies, timeout)) { | |
de699ad5 | 688 | if (ide_do_test_unit_ready(drive, disk) == 0) |
1da177e4 LT |
689 | return 0; |
690 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
691 | || (tape->asc == 0x3A)) { |
692 | /* no media */ | |
1da177e4 LT |
693 | if (load_attempted) |
694 | return -ENOMEDIUM; | |
0c8a6c7a | 695 | ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
1da177e4 LT |
696 | load_attempted = 1; |
697 | /* not about to be ready */ | |
698 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
699 | (tape->ascq == 1 || tape->ascq == 8))) | |
700 | return -EIO; | |
80ce45fd | 701 | msleep(100); |
1da177e4 LT |
702 | } |
703 | return -EIO; | |
704 | } | |
705 | ||
5a04cfa9 | 706 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 707 | { |
2ac07d92 | 708 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 709 | struct ide_atapi_pc pc; |
1da177e4 LT |
710 | int rc; |
711 | ||
712 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
b13345f3 | 713 | rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0); |
5a04cfa9 | 714 | if (rc) |
1da177e4 LT |
715 | return rc; |
716 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
717 | return 0; | |
718 | } | |
719 | ||
55ce3a12 | 720 | static int ide_tape_read_position(ide_drive_t *drive) |
1da177e4 LT |
721 | { |
722 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 723 | struct ide_atapi_pc pc; |
55ce3a12 | 724 | u8 buf[20]; |
1da177e4 | 725 | |
e972d702 | 726 | ide_debug_log(IDE_DBG_FUNC, "enter"); |
1da177e4 | 727 | |
55ce3a12 BP |
728 | /* prep cmd */ |
729 | ide_init_pc(&pc); | |
730 | pc.c[0] = READ_POSITION; | |
731 | pc.req_xfer = 20; | |
732 | ||
733 | if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) | |
1da177e4 | 734 | return -1; |
55ce3a12 BP |
735 | |
736 | if (!pc.error) { | |
e972d702 | 737 | ide_debug_log(IDE_DBG_FUNC, "BOP - %s", |
55ce3a12 | 738 | (buf[0] & 0x80) ? "Yes" : "No"); |
e972d702 | 739 | ide_debug_log(IDE_DBG_FUNC, "EOP - %s", |
55ce3a12 BP |
740 | (buf[0] & 0x40) ? "Yes" : "No"); |
741 | ||
742 | if (buf[0] & 0x4) { | |
743 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
744 | "to the tape\n"); | |
8dcce408 BZ |
745 | clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), |
746 | &drive->atapi_flags); | |
55ce3a12 BP |
747 | return -1; |
748 | } else { | |
e972d702 BP |
749 | ide_debug_log(IDE_DBG_FUNC, "Block Location: %u", |
750 | be32_to_cpup((__be32 *)&buf[4])); | |
55ce3a12 BP |
751 | |
752 | tape->partition = buf[1]; | |
753 | tape->first_frame = be32_to_cpup((__be32 *)&buf[4]); | |
8dcce408 BZ |
754 | set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), |
755 | &drive->atapi_flags); | |
55ce3a12 BP |
756 | } |
757 | } | |
758 | ||
759 | return tape->first_frame; | |
1da177e4 LT |
760 | } |
761 | ||
d236d74c BP |
762 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
763 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 764 | unsigned int block, u8 partition, int skip) |
1da177e4 | 765 | { |
7bf7420a | 766 | ide_init_pc(pc); |
90699ce2 | 767 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 768 | pc->c[1] = 2; |
860ff5ec | 769 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 770 | pc->c[8] = partition; |
346331f8 | 771 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
772 | } |
773 | ||
ec0fdb01 | 774 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
775 | { |
776 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 777 | |
54abf37e | 778 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 779 | return; |
1da177e4 | 780 | |
49d8078a | 781 | clear_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags); |
963da55c TH |
782 | tape->valid = 0; |
783 | if (tape->buf != NULL) { | |
784 | kfree(tape->buf); | |
785 | tape->buf = NULL; | |
1da177e4 LT |
786 | } |
787 | ||
54abf37e | 788 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
789 | } |
790 | ||
791 | /* | |
3c98bf34 BP |
792 | * Position the tape to the requested block using the LOCATE packet command. |
793 | * A READ POSITION command is then issued to check where we are positioned. Like | |
794 | * all higher level operations, we queue the commands at the tail of the request | |
795 | * queue and wait for their completion. | |
1da177e4 | 796 | */ |
5a04cfa9 BP |
797 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
798 | u8 partition, int skip) | |
1da177e4 LT |
799 | { |
800 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 801 | struct gendisk *disk = tape->disk; |
55ce3a12 | 802 | int ret; |
d236d74c | 803 | struct ide_atapi_pc pc; |
1da177e4 | 804 | |
54abf37e | 805 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 806 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
807 | idetape_wait_ready(drive, 60 * 5 * HZ); |
808 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
55ce3a12 BP |
809 | ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
810 | if (ret) | |
811 | return ret; | |
1da177e4 | 812 | |
55ce3a12 BP |
813 | ret = ide_tape_read_position(drive); |
814 | if (ret < 0) | |
815 | return ret; | |
816 | return 0; | |
1da177e4 LT |
817 | } |
818 | ||
ec0fdb01 | 819 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 820 | int restore_position) |
1da177e4 LT |
821 | { |
822 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
823 | int seek, position; |
824 | ||
ec0fdb01 | 825 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 | 826 | if (restore_position) { |
55ce3a12 | 827 | position = ide_tape_read_position(drive); |
9798630a | 828 | seek = position > 0 ? position : 0; |
1da177e4 | 829 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 830 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 831 | " %s\n", tape->name, __func__); |
1da177e4 LT |
832 | return; |
833 | } | |
834 | } | |
835 | } | |
836 | ||
837 | /* | |
3c98bf34 BP |
838 | * Generate a read/write request for the block device interface and wait for it |
839 | * to be serviced. | |
1da177e4 | 840 | */ |
6bb11dd1 | 841 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) |
1da177e4 LT |
842 | { |
843 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a | 844 | struct request *rq; |
21d9c5d2 | 845 | int ret; |
1da177e4 | 846 | |
e972d702 BP |
847 | ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, size: %d", cmd, size); |
848 | ||
21d9c5d2 | 849 | BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); |
6bb11dd1 | 850 | BUG_ON(size < 0 || size % tape->blk_size); |
8004a8c9 | 851 | |
64ea1b4a FT |
852 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
853 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 854 | rq->cmd[13] = cmd; |
64ea1b4a | 855 | rq->rq_disk = tape->disk; |
c9059598 | 856 | rq->__sector = tape->first_frame; |
21d9c5d2 TH |
857 | |
858 | if (size) { | |
963da55c | 859 | ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, |
21d9c5d2 TH |
860 | __GFP_WAIT); |
861 | if (ret) | |
862 | goto out_put; | |
863 | } | |
864 | ||
64ea1b4a FT |
865 | blk_execute_rq(drive->queue, tape->disk, rq, 0); |
866 | ||
963da55c | 867 | /* calculate the number of transferred bytes and update buffer state */ |
c3a4d78c | 868 | size -= rq->resid_len; |
963da55c | 869 | tape->cur = tape->buf; |
21d9c5d2 | 870 | if (cmd == REQ_IDETAPE_READ) |
963da55c TH |
871 | tape->valid = size; |
872 | else | |
873 | tape->valid = 0; | |
1da177e4 | 874 | |
21d9c5d2 TH |
875 | ret = size; |
876 | if (rq->errors == IDE_DRV_ERROR_GENERAL) | |
877 | ret = -EIO; | |
21d9c5d2 TH |
878 | out_put: |
879 | blk_put_request(rq); | |
64ea1b4a | 880 | return ret; |
1da177e4 LT |
881 | } |
882 | ||
d236d74c | 883 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 884 | { |
7bf7420a | 885 | ide_init_pc(pc); |
90699ce2 | 886 | pc->c[0] = INQUIRY; |
5a04cfa9 | 887 | pc->c[4] = 254; |
d236d74c | 888 | pc->req_xfer = 254; |
1da177e4 LT |
889 | } |
890 | ||
d236d74c BP |
891 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
892 | struct ide_atapi_pc *pc) | |
1da177e4 | 893 | { |
7bf7420a | 894 | ide_init_pc(pc); |
90699ce2 | 895 | pc->c[0] = REZERO_UNIT; |
346331f8 | 896 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
897 | } |
898 | ||
d236d74c | 899 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 900 | { |
7bf7420a | 901 | ide_init_pc(pc); |
90699ce2 | 902 | pc->c[0] = ERASE; |
1da177e4 | 903 | pc->c[1] = 1; |
346331f8 | 904 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
905 | } |
906 | ||
d236d74c | 907 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 | 908 | { |
7bf7420a | 909 | ide_init_pc(pc); |
90699ce2 | 910 | pc->c[0] = SPACE; |
860ff5ec | 911 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 912 | pc->c[1] = cmd; |
346331f8 | 913 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
914 | } |
915 | ||
d9df937a | 916 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
917 | { |
918 | idetape_tape_t *tape = drive->driver_data; | |
55a5d291 | 919 | |
54abf37e | 920 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 921 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 922 | " but we are not writing.\n"); |
1da177e4 LT |
923 | return; |
924 | } | |
963da55c | 925 | if (tape->buf) { |
6bb11dd1 TH |
926 | size_t aligned = roundup(tape->valid, tape->blk_size); |
927 | ||
928 | memset(tape->cur, 0, aligned - tape->valid); | |
07bd9686 | 929 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned); |
963da55c TH |
930 | kfree(tape->buf); |
931 | tape->buf = NULL; | |
1da177e4 | 932 | } |
54abf37e | 933 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
934 | } |
935 | ||
88f1b941 | 936 | static int idetape_init_rw(ide_drive_t *drive, int dir) |
1da177e4 LT |
937 | { |
938 | idetape_tape_t *tape = drive->driver_data; | |
88f1b941 | 939 | int rc; |
1da177e4 | 940 | |
88f1b941 | 941 | BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); |
1da177e4 | 942 | |
88f1b941 TH |
943 | if (tape->chrdev_dir == dir) |
944 | return 0; | |
945 | ||
946 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
947 | ide_tape_discard_merge_buffer(drive, 1); | |
948 | else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
949 | ide_tape_flush_merge_buffer(drive); | |
950 | idetape_flush_tape_buffers(drive); | |
951 | } | |
952 | ||
953 | if (tape->buf || tape->valid) { | |
954 | printk(KERN_ERR "ide-tape: valid should be 0 now\n"); | |
955 | tape->valid = 0; | |
956 | } | |
957 | ||
958 | tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); | |
959 | if (!tape->buf) | |
960 | return -ENOMEM; | |
961 | tape->chrdev_dir = dir; | |
962 | tape->cur = tape->buf; | |
963 | ||
964 | /* | |
965 | * Issue a 0 rw command to ensure that DSC handshake is | |
966 | * switched from completion mode to buffer available mode. No | |
967 | * point in issuing this if DSC overlap isn't supported, some | |
968 | * drives (Seagate STT3401A) will return an error. | |
969 | */ | |
970 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { | |
971 | int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ | |
972 | : REQ_IDETAPE_WRITE; | |
973 | ||
974 | rc = idetape_queue_rw_tail(drive, cmd, 0); | |
975 | if (rc < 0) { | |
976 | kfree(tape->buf); | |
977 | tape->buf = NULL; | |
978 | tape->chrdev_dir = IDETAPE_DIR_NONE; | |
979 | return rc; | |
1da177e4 LT |
980 | } |
981 | } | |
5e69bd95 | 982 | |
1da177e4 LT |
983 | return 0; |
984 | } | |
985 | ||
5a04cfa9 | 986 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
987 | { |
988 | idetape_tape_t *tape = drive->driver_data; | |
963da55c TH |
989 | |
990 | memset(tape->buf, 0, tape->buffer_size); | |
3c98bf34 | 991 | |
1da177e4 | 992 | while (bcount) { |
963da55c | 993 | unsigned int count = min(tape->buffer_size, bcount); |
1da177e4 | 994 | |
6bb11dd1 | 995 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); |
1da177e4 | 996 | bcount -= count; |
1da177e4 LT |
997 | } |
998 | } | |
999 | ||
1da177e4 | 1000 | /* |
3c98bf34 BP |
1001 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1002 | * currently support only one partition. | |
1003 | */ | |
5a04cfa9 | 1004 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 | 1005 | { |
2ac07d92 BZ |
1006 | struct ide_tape_obj *tape = drive->driver_data; |
1007 | struct gendisk *disk = tape->disk; | |
d236d74c | 1008 | struct ide_atapi_pc pc; |
55ce3a12 | 1009 | int ret; |
8004a8c9 | 1010 | |
e972d702 | 1011 | ide_debug_log(IDE_DBG_FUNC, "enter"); |
8004a8c9 | 1012 | |
1da177e4 | 1013 | idetape_create_rewind_cmd(drive, &pc); |
55ce3a12 BP |
1014 | ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
1015 | if (ret) | |
1016 | return ret; | |
1da177e4 | 1017 | |
55ce3a12 BP |
1018 | ret = ide_tape_read_position(drive); |
1019 | if (ret < 0) | |
1020 | return ret; | |
1da177e4 LT |
1021 | return 0; |
1022 | } | |
1023 | ||
3c98bf34 | 1024 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1025 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1026 | unsigned long arg) | |
1da177e4 LT |
1027 | { |
1028 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1029 | void __user *argp = (void __user *)arg; |
1030 | ||
d59823fa BP |
1031 | struct idetape_config { |
1032 | int dsc_rw_frequency; | |
1033 | int dsc_media_access_frequency; | |
1034 | int nr_stages; | |
1035 | } config; | |
1036 | ||
e972d702 | 1037 | ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%04x", cmd); |
8004a8c9 | 1038 | |
1da177e4 | 1039 | switch (cmd) { |
5a04cfa9 BP |
1040 | case 0x0340: |
1041 | if (copy_from_user(&config, argp, sizeof(config))) | |
1042 | return -EFAULT; | |
1043 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1044 | break; |
1045 | case 0x0350: | |
2fc2111c | 1046 | memset(&config, 0, sizeof(config)); |
5a04cfa9 | 1047 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; |
83042b24 | 1048 | config.nr_stages = 1; |
5a04cfa9 BP |
1049 | if (copy_to_user(argp, &config, sizeof(config))) |
1050 | return -EFAULT; | |
1051 | break; | |
1052 | default: | |
1053 | return -EIO; | |
1da177e4 LT |
1054 | } |
1055 | return 0; | |
1056 | } | |
1057 | ||
5a04cfa9 BP |
1058 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1059 | int mt_count) | |
1da177e4 LT |
1060 | { |
1061 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1062 | struct gendisk *disk = tape->disk; |
d236d74c | 1063 | struct ide_atapi_pc pc; |
5a04cfa9 | 1064 | int retval, count = 0; |
b6422013 | 1065 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 | 1066 | |
e972d702 BP |
1067 | |
1068 | ide_debug_log(IDE_DBG_FUNC, "mt_op: %d, mt_count: %d", mt_op, mt_count); | |
1069 | ||
1da177e4 LT |
1070 | if (mt_count == 0) |
1071 | return 0; | |
1072 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1073 | if (!sprev) |
1da177e4 | 1074 | return -EIO; |
5a04cfa9 | 1075 | mt_count = -mt_count; |
1da177e4 LT |
1076 | } |
1077 | ||
54abf37e | 1078 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
963da55c | 1079 | tape->valid = 0; |
49d8078a BP |
1080 | if (test_and_clear_bit(ilog2(IDE_AFLAG_FILEMARK), |
1081 | &drive->atapi_flags)) | |
1da177e4 | 1082 | ++count; |
ec0fdb01 | 1083 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1084 | } |
1085 | ||
1da177e4 | 1086 | switch (mt_op) { |
5a04cfa9 BP |
1087 | case MTFSF: |
1088 | case MTBSF: | |
1089 | idetape_create_space_cmd(&pc, mt_count - count, | |
1090 | IDETAPE_SPACE_OVER_FILEMARK); | |
b13345f3 | 1091 | return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
5a04cfa9 BP |
1092 | case MTFSFM: |
1093 | case MTBSFM: | |
1094 | if (!sprev) | |
1095 | return -EIO; | |
1096 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1097 | mt_count - count); | |
1098 | if (retval) | |
1099 | return retval; | |
1100 | count = (MTBSFM == mt_op ? 1 : -1); | |
1101 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1102 | default: | |
1103 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1104 | mt_op); | |
1105 | return -EIO; | |
1da177e4 LT |
1106 | } |
1107 | } | |
1108 | ||
1da177e4 | 1109 | /* |
3c98bf34 | 1110 | * Our character device read / write functions. |
1da177e4 | 1111 | * |
3c98bf34 BP |
1112 | * The tape is optimized to maximize throughput when it is transferring an |
1113 | * integral number of the "continuous transfer limit", which is a parameter of | |
1114 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1115 | * |
3c98bf34 BP |
1116 | * As of version 1.3 of the driver, the character device provides an abstract |
1117 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1118 | * same backup/restore procedure is supported. The driver will internally | |
1119 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1120 | * between the user's block size to the recommended size will only result in a | |
1121 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1122 | * This is not applicable to Onstream. | |
1da177e4 | 1123 | */ |
5a04cfa9 BP |
1124 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1125 | size_t count, loff_t *ppos) | |
1da177e4 | 1126 | { |
5aeddf90 | 1127 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1128 | ide_drive_t *drive = tape->drive; |
07bd9686 | 1129 | size_t done = 0; |
dcd96379 | 1130 | ssize_t ret = 0; |
07bd9686 | 1131 | int rc; |
1da177e4 | 1132 | |
e972d702 | 1133 | ide_debug_log(IDE_DBG_FUNC, "count %Zd", count); |
1da177e4 | 1134 | |
54abf37e | 1135 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
49d8078a | 1136 | if (test_bit(ilog2(IDE_AFLAG_DETECT_BS), &drive->atapi_flags)) |
54bb2074 BP |
1137 | if (count > tape->blk_size && |
1138 | (count % tape->blk_size) == 0) | |
1139 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1140 | } |
07bd9686 | 1141 | |
88f1b941 | 1142 | rc = idetape_init_rw(drive, IDETAPE_DIR_READ); |
8d06bfad | 1143 | if (rc < 0) |
1da177e4 | 1144 | return rc; |
07bd9686 TH |
1145 | |
1146 | while (done < count) { | |
1147 | size_t todo; | |
1148 | ||
1149 | /* refill if staging buffer is empty */ | |
1150 | if (!tape->valid) { | |
1151 | /* If we are at a filemark, nothing more to read */ | |
49d8078a BP |
1152 | if (test_bit(ilog2(IDE_AFLAG_FILEMARK), |
1153 | &drive->atapi_flags)) | |
07bd9686 TH |
1154 | break; |
1155 | /* read */ | |
1156 | if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, | |
1157 | tape->buffer_size) <= 0) | |
1158 | break; | |
1159 | } | |
1160 | ||
1161 | /* copy out */ | |
1162 | todo = min_t(size_t, count - done, tape->valid); | |
1163 | if (copy_to_user(buf + done, tape->cur, todo)) | |
dcd96379 | 1164 | ret = -EFAULT; |
07bd9686 TH |
1165 | |
1166 | tape->cur += todo; | |
1167 | tape->valid -= todo; | |
1168 | done += todo; | |
1da177e4 | 1169 | } |
07bd9686 | 1170 | |
49d8078a | 1171 | if (!done && test_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags)) { |
1da177e4 LT |
1172 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1173 | return 0; | |
1174 | } | |
dcd96379 | 1175 | |
07bd9686 | 1176 | return ret ? ret : done; |
1da177e4 LT |
1177 | } |
1178 | ||
5a04cfa9 | 1179 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1180 | size_t count, loff_t *ppos) |
1181 | { | |
5aeddf90 | 1182 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1183 | ide_drive_t *drive = tape->drive; |
07bd9686 | 1184 | size_t done = 0; |
dcd96379 | 1185 | ssize_t ret = 0; |
88f1b941 | 1186 | int rc; |
1da177e4 LT |
1187 | |
1188 | /* The drive is write protected. */ | |
1189 | if (tape->write_prot) | |
1190 | return -EACCES; | |
1191 | ||
e972d702 | 1192 | ide_debug_log(IDE_DBG_FUNC, "count %Zd", count); |
1da177e4 LT |
1193 | |
1194 | /* Initialize write operation */ | |
88f1b941 TH |
1195 | rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); |
1196 | if (rc < 0) | |
1197 | return rc; | |
07bd9686 TH |
1198 | |
1199 | while (done < count) { | |
1200 | size_t todo; | |
1201 | ||
1202 | /* flush if staging buffer is full */ | |
1203 | if (tape->valid == tape->buffer_size && | |
1204 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, | |
1205 | tape->buffer_size) <= 0) | |
1206 | return rc; | |
1207 | ||
1208 | /* copy in */ | |
1209 | todo = min_t(size_t, count - done, | |
1210 | tape->buffer_size - tape->valid); | |
1211 | if (copy_from_user(tape->cur, buf + done, todo)) | |
dcd96379 | 1212 | ret = -EFAULT; |
07bd9686 TH |
1213 | |
1214 | tape->cur += todo; | |
1215 | tape->valid += todo; | |
1216 | done += todo; | |
1da177e4 | 1217 | } |
07bd9686 TH |
1218 | |
1219 | return ret ? ret : done; | |
1da177e4 LT |
1220 | } |
1221 | ||
5a04cfa9 | 1222 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1223 | { |
2ac07d92 | 1224 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1225 | struct ide_atapi_pc pc; |
1da177e4 LT |
1226 | |
1227 | /* Write a filemark */ | |
1228 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
b13345f3 | 1229 | if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) { |
1da177e4 LT |
1230 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
1231 | return -EIO; | |
1232 | } | |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | /* | |
d99c9da2 BP |
1237 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1238 | * requested. | |
1da177e4 | 1239 | * |
d99c9da2 BP |
1240 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1241 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1242 | * usually not supported. |
1da177e4 | 1243 | * |
d99c9da2 | 1244 | * The following commands are currently not supported: |
1da177e4 | 1245 | * |
d99c9da2 BP |
1246 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1247 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1248 | */ |
d99c9da2 | 1249 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1250 | { |
1251 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1252 | struct gendisk *disk = tape->disk; |
d236d74c | 1253 | struct ide_atapi_pc pc; |
5a04cfa9 | 1254 | int i, retval; |
1da177e4 | 1255 | |
e972d702 BP |
1256 | ide_debug_log(IDE_DBG_FUNC, "MTIOCTOP ioctl: mt_op: %d, mt_count: %d", |
1257 | mt_op, mt_count); | |
5a04cfa9 | 1258 | |
1da177e4 | 1259 | switch (mt_op) { |
5a04cfa9 BP |
1260 | case MTFSF: |
1261 | case MTFSFM: | |
1262 | case MTBSF: | |
1263 | case MTBSFM: | |
1264 | if (!mt_count) | |
1265 | return 0; | |
1266 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1267 | default: | |
1268 | break; | |
1da177e4 | 1269 | } |
5a04cfa9 | 1270 | |
1da177e4 | 1271 | switch (mt_op) { |
5a04cfa9 BP |
1272 | case MTWEOF: |
1273 | if (tape->write_prot) | |
1274 | return -EACCES; | |
ec0fdb01 | 1275 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1276 | for (i = 0; i < mt_count; i++) { |
1277 | retval = idetape_write_filemark(drive); | |
1278 | if (retval) | |
1279 | return retval; | |
1280 | } | |
1281 | return 0; | |
1282 | case MTREW: | |
ec0fdb01 | 1283 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1284 | if (idetape_rewind_tape(drive)) |
1285 | return -EIO; | |
1286 | return 0; | |
1287 | case MTLOAD: | |
ec0fdb01 | 1288 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1289 | return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1290 | case MTUNLOAD: |
1291 | case MTOFFL: | |
1292 | /* | |
1293 | * If door is locked, attempt to unlock before | |
1294 | * attempting to eject. | |
1295 | */ | |
1296 | if (tape->door_locked) { | |
0578042d | 1297 | if (!ide_set_media_lock(drive, disk, 0)) |
385a4b87 | 1298 | tape->door_locked = DOOR_UNLOCKED; |
5a04cfa9 | 1299 | } |
ec0fdb01 | 1300 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1301 | retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); |
5a04cfa9 | 1302 | if (!retval) |
49d8078a BP |
1303 | clear_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), |
1304 | &drive->atapi_flags); | |
5a04cfa9 BP |
1305 | return retval; |
1306 | case MTNOP: | |
ec0fdb01 | 1307 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1308 | return idetape_flush_tape_buffers(drive); |
1309 | case MTRETEN: | |
ec0fdb01 | 1310 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1311 | return ide_do_start_stop(drive, disk, |
5a04cfa9 | 1312 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1313 | case MTEOM: |
1314 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
b13345f3 | 1315 | return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
5a04cfa9 BP |
1316 | case MTERASE: |
1317 | (void)idetape_rewind_tape(drive); | |
1318 | idetape_create_erase_cmd(&pc); | |
b13345f3 | 1319 | return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
5a04cfa9 BP |
1320 | case MTSETBLK: |
1321 | if (mt_count) { | |
1322 | if (mt_count < tape->blk_size || | |
1323 | mt_count % tape->blk_size) | |
1da177e4 | 1324 | return -EIO; |
5a04cfa9 | 1325 | tape->user_bs_factor = mt_count / tape->blk_size; |
49d8078a BP |
1326 | clear_bit(ilog2(IDE_AFLAG_DETECT_BS), |
1327 | &drive->atapi_flags); | |
5a04cfa9 | 1328 | } else |
49d8078a BP |
1329 | set_bit(ilog2(IDE_AFLAG_DETECT_BS), |
1330 | &drive->atapi_flags); | |
5a04cfa9 BP |
1331 | return 0; |
1332 | case MTSEEK: | |
ec0fdb01 | 1333 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1334 | return idetape_position_tape(drive, |
1335 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1336 | case MTSETPART: | |
ec0fdb01 | 1337 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1338 | return idetape_position_tape(drive, 0, mt_count, 0); |
1339 | case MTFSR: | |
1340 | case MTBSR: | |
1341 | case MTLOCK: | |
0578042d | 1342 | retval = ide_set_media_lock(drive, disk, 1); |
5a04cfa9 | 1343 | if (retval) |
1da177e4 | 1344 | return retval; |
5a04cfa9 BP |
1345 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1346 | return 0; | |
1347 | case MTUNLOCK: | |
0578042d | 1348 | retval = ide_set_media_lock(drive, disk, 0); |
5a04cfa9 BP |
1349 | if (retval) |
1350 | return retval; | |
1351 | tape->door_locked = DOOR_UNLOCKED; | |
1352 | return 0; | |
1353 | default: | |
1354 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1355 | mt_op); | |
1356 | return -EIO; | |
1da177e4 LT |
1357 | } |
1358 | } | |
1359 | ||
1360 | /* | |
d99c9da2 BP |
1361 | * Our character device ioctls. General mtio.h magnetic io commands are |
1362 | * supported here, and not in the corresponding block interface. Our own | |
1363 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 1364 | */ |
d99c9da2 BP |
1365 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
1366 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1367 | { |
5aeddf90 | 1368 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 LT |
1369 | ide_drive_t *drive = tape->drive; |
1370 | struct mtop mtop; | |
1371 | struct mtget mtget; | |
1372 | struct mtpos mtpos; | |
54bb2074 | 1373 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
1374 | void __user *argp = (void __user *)arg; |
1375 | ||
e972d702 | 1376 | ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x", cmd); |
1da177e4 | 1377 | |
54abf37e | 1378 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 1379 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1380 | idetape_flush_tape_buffers(drive); |
1381 | } | |
1382 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
963da55c | 1383 | block_offset = tape->valid / |
54bb2074 | 1384 | (tape->blk_size * tape->user_bs_factor); |
55ce3a12 | 1385 | position = ide_tape_read_position(drive); |
5a04cfa9 | 1386 | if (position < 0) |
1da177e4 LT |
1387 | return -EIO; |
1388 | } | |
1389 | switch (cmd) { | |
5a04cfa9 BP |
1390 | case MTIOCTOP: |
1391 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
1392 | return -EFAULT; | |
1393 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
1394 | case MTIOCGET: | |
1395 | memset(&mtget, 0, sizeof(struct mtget)); | |
1396 | mtget.mt_type = MT_ISSCSI2; | |
1397 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1398 | mtget.mt_dsreg = | |
1399 | ((tape->blk_size * tape->user_bs_factor) | |
1400 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
1401 | ||
1402 | if (tape->drv_write_prot) | |
1403 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
1404 | ||
1405 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
1406 | return -EFAULT; | |
1407 | return 0; | |
1408 | case MTIOCPOS: | |
1409 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1410 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
1411 | return -EFAULT; | |
1412 | return 0; | |
1413 | default: | |
1414 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1415 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 1416 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
1417 | } |
1418 | } | |
1419 | ||
3cffb9ce BP |
1420 | /* |
1421 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
1422 | * block size with the reported value. | |
1423 | */ | |
1424 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
1425 | { | |
1426 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1427 | struct ide_atapi_pc pc; |
837272b4 | 1428 | u8 buf[12]; |
3cffb9ce BP |
1429 | |
1430 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
837272b4 | 1431 | if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { |
3cffb9ce | 1432 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
54bb2074 | 1433 | if (tape->blk_size == 0) { |
3cffb9ce BP |
1434 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
1435 | "block size, assuming 32k\n"); | |
54bb2074 | 1436 | tape->blk_size = 32768; |
3cffb9ce BP |
1437 | } |
1438 | return; | |
1439 | } | |
837272b4 BP |
1440 | tape->blk_size = (buf[4 + 5] << 16) + |
1441 | (buf[4 + 6] << 8) + | |
1442 | buf[4 + 7]; | |
1443 | tape->drv_write_prot = (buf[2] & 0x80) >> 7; | |
e972d702 BP |
1444 | |
1445 | ide_debug_log(IDE_DBG_FUNC, "blk_size: %d, write_prot: %d", | |
1446 | tape->blk_size, tape->drv_write_prot); | |
3cffb9ce | 1447 | } |
1da177e4 | 1448 | |
5a04cfa9 | 1449 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
1450 | { |
1451 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
1452 | ide_drive_t *drive; | |
1453 | idetape_tape_t *tape; | |
1da177e4 LT |
1454 | int retval; |
1455 | ||
8004a8c9 BP |
1456 | if (i >= MAX_HWIFS * MAX_DRIVES) |
1457 | return -ENXIO; | |
1458 | ||
04f4ac9d | 1459 | lock_kernel(); |
9d01e4cd | 1460 | tape = ide_tape_get(NULL, true, i); |
04f4ac9d JC |
1461 | if (!tape) { |
1462 | unlock_kernel(); | |
8004a8c9 | 1463 | return -ENXIO; |
04f4ac9d | 1464 | } |
8004a8c9 | 1465 | |
e972d702 BP |
1466 | drive = tape->drive; |
1467 | filp->private_data = tape; | |
1468 | ||
1469 | ide_debug_log(IDE_DBG_FUNC, "enter"); | |
8004a8c9 | 1470 | |
1da177e4 LT |
1471 | /* |
1472 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1473 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1474 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1475 | */ | |
1476 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1477 | ||
1da177e4 | 1478 | |
49d8078a | 1479 | if (test_and_set_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags)) { |
1da177e4 LT |
1480 | retval = -EBUSY; |
1481 | goto out_put_tape; | |
1482 | } | |
1483 | ||
1484 | retval = idetape_wait_ready(drive, 60 * HZ); | |
1485 | if (retval) { | |
49d8078a | 1486 | clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); |
1da177e4 LT |
1487 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
1488 | goto out_put_tape; | |
1489 | } | |
1490 | ||
79ca743f | 1491 | ide_tape_read_position(drive); |
49d8078a | 1492 | if (!test_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), &drive->atapi_flags)) |
1da177e4 LT |
1493 | (void)idetape_rewind_tape(drive); |
1494 | ||
1da177e4 | 1495 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 1496 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
1497 | |
1498 | /* Set write protect flag if device is opened as read-only. */ | |
1499 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
1500 | tape->write_prot = 1; | |
1501 | else | |
1502 | tape->write_prot = tape->drv_write_prot; | |
1503 | ||
1504 | /* Make sure drive isn't write protected if user wants to write. */ | |
1505 | if (tape->write_prot) { | |
1506 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
1507 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
49d8078a | 1508 | clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); |
1da177e4 LT |
1509 | retval = -EROFS; |
1510 | goto out_put_tape; | |
1511 | } | |
1512 | } | |
1513 | ||
3c98bf34 | 1514 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 1515 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
0578042d | 1516 | if (!ide_set_media_lock(drive, tape->disk, 1)) { |
385a4b87 BZ |
1517 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
1518 | tape->door_locked = DOOR_LOCKED; | |
1da177e4 LT |
1519 | } |
1520 | } | |
04f4ac9d | 1521 | unlock_kernel(); |
1da177e4 LT |
1522 | return 0; |
1523 | ||
1524 | out_put_tape: | |
1525 | ide_tape_put(tape); | |
04f4ac9d | 1526 | unlock_kernel(); |
1da177e4 LT |
1527 | return retval; |
1528 | } | |
1529 | ||
5a04cfa9 | 1530 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
1531 | { |
1532 | idetape_tape_t *tape = drive->driver_data; | |
1533 | ||
d9df937a | 1534 | ide_tape_flush_merge_buffer(drive); |
963da55c TH |
1535 | tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); |
1536 | if (tape->buf != NULL) { | |
54bb2074 BP |
1537 | idetape_pad_zeros(drive, tape->blk_size * |
1538 | (tape->user_bs_factor - 1)); | |
963da55c TH |
1539 | kfree(tape->buf); |
1540 | tape->buf = NULL; | |
1da177e4 LT |
1541 | } |
1542 | idetape_write_filemark(drive); | |
1543 | idetape_flush_tape_buffers(drive); | |
1544 | idetape_flush_tape_buffers(drive); | |
1545 | } | |
1546 | ||
5a04cfa9 | 1547 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 | 1548 | { |
5aeddf90 | 1549 | struct ide_tape_obj *tape = filp->private_data; |
1da177e4 | 1550 | ide_drive_t *drive = tape->drive; |
1da177e4 LT |
1551 | unsigned int minor = iminor(inode); |
1552 | ||
1553 | lock_kernel(); | |
1554 | tape = drive->driver_data; | |
8004a8c9 | 1555 | |
e972d702 | 1556 | ide_debug_log(IDE_DBG_FUNC, "enter"); |
1da177e4 | 1557 | |
54abf37e | 1558 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 1559 | idetape_write_release(drive, minor); |
54abf37e | 1560 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 1561 | if (minor < 128) |
ec0fdb01 | 1562 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 1563 | } |
f64eee7b | 1564 | |
49d8078a BP |
1565 | if (minor < 128 && test_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), |
1566 | &drive->atapi_flags)) | |
1da177e4 | 1567 | (void) idetape_rewind_tape(drive); |
49d8078a | 1568 | |
54abf37e | 1569 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 | 1570 | if (tape->door_locked == DOOR_LOCKED) { |
0578042d | 1571 | if (!ide_set_media_lock(drive, tape->disk, 0)) |
385a4b87 | 1572 | tape->door_locked = DOOR_UNLOCKED; |
1da177e4 LT |
1573 | } |
1574 | } | |
49d8078a | 1575 | clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); |
1da177e4 LT |
1576 | ide_tape_put(tape); |
1577 | unlock_kernel(); | |
1578 | return 0; | |
1579 | } | |
1580 | ||
6d29c8f0 | 1581 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 1582 | { |
1da177e4 | 1583 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 1584 | struct ide_atapi_pc pc; |
41fa9f86 | 1585 | u8 pc_buf[256]; |
801bd32e | 1586 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 1587 | |
1da177e4 | 1588 | idetape_create_inquiry_cmd(&pc); |
b13345f3 | 1589 | if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) { |
6d29c8f0 BP |
1590 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
1591 | tape->name); | |
1da177e4 LT |
1592 | return; |
1593 | } | |
b13345f3 BP |
1594 | memcpy(vendor_id, &pc_buf[8], 8); |
1595 | memcpy(product_id, &pc_buf[16], 16); | |
1596 | memcpy(fw_rev, &pc_buf[32], 4); | |
41f81d54 | 1597 | |
801bd32e BP |
1598 | ide_fixstring(vendor_id, 8, 0); |
1599 | ide_fixstring(product_id, 16, 0); | |
1600 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 1601 | |
801bd32e | 1602 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 1603 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
1604 | } |
1605 | ||
1606 | /* | |
b6422013 BP |
1607 | * Ask the tape about its various parameters. In particular, we will adjust our |
1608 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 1609 | */ |
5a04cfa9 | 1610 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
1611 | { |
1612 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1613 | struct ide_atapi_pc pc; |
b13345f3 | 1614 | u8 buf[24], *caps; |
b6422013 | 1615 | u8 speed, max_speed; |
47314fa4 | 1616 | |
1da177e4 | 1617 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
b13345f3 | 1618 | if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { |
b6422013 BP |
1619 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
1620 | " some default values\n"); | |
54bb2074 | 1621 | tape->blk_size = 512; |
b6422013 BP |
1622 | put_unaligned(52, (u16 *)&tape->caps[12]); |
1623 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
1624 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
1625 | return; |
1626 | } | |
b13345f3 | 1627 | caps = buf + 4 + buf[3]; |
b6422013 BP |
1628 | |
1629 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
1630 | speed = be16_to_cpup((__be16 *)&caps[14]); |
1631 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 1632 | |
cd740ab0 HH |
1633 | *(u16 *)&caps[8] = max_speed; |
1634 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
1635 | *(u16 *)&caps[14] = speed; | |
1636 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 1637 | |
b6422013 BP |
1638 | if (!speed) { |
1639 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
1640 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 1641 | *(u16 *)&caps[14] = 650; |
1da177e4 | 1642 | } |
b6422013 BP |
1643 | if (!max_speed) { |
1644 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
1645 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 1646 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
1647 | } |
1648 | ||
b6422013 | 1649 | memcpy(&tape->caps, caps, 20); |
0578042d BZ |
1650 | |
1651 | /* device lacks locking support according to capabilities page */ | |
1652 | if ((caps[6] & 1) == 0) | |
42619d35 | 1653 | drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; |
0578042d | 1654 | |
b6422013 | 1655 | if (caps[7] & 0x02) |
54bb2074 | 1656 | tape->blk_size = 512; |
b6422013 | 1657 | else if (caps[7] & 0x04) |
54bb2074 | 1658 | tape->blk_size = 1024; |
1da177e4 LT |
1659 | } |
1660 | ||
7662d046 | 1661 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
1662 | #define ide_tape_devset_get(name, field) \ |
1663 | static int get_##name(ide_drive_t *drive) \ | |
1664 | { \ | |
1665 | idetape_tape_t *tape = drive->driver_data; \ | |
1666 | return tape->field; \ | |
1667 | } | |
1668 | ||
1669 | #define ide_tape_devset_set(name, field) \ | |
1670 | static int set_##name(ide_drive_t *drive, int arg) \ | |
1671 | { \ | |
1672 | idetape_tape_t *tape = drive->driver_data; \ | |
1673 | tape->field = arg; \ | |
1674 | return 0; \ | |
1675 | } | |
1676 | ||
92f1f8fd | 1677 | #define ide_tape_devset_rw_field(_name, _field) \ |
8185d5aa BZ |
1678 | ide_tape_devset_get(_name, _field) \ |
1679 | ide_tape_devset_set(_name, _field) \ | |
92f1f8fd | 1680 | IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) |
8185d5aa | 1681 | |
92f1f8fd | 1682 | #define ide_tape_devset_r_field(_name, _field) \ |
8185d5aa | 1683 | ide_tape_devset_get(_name, _field) \ |
92f1f8fd | 1684 | IDE_DEVSET(_name, 0, get_##_name, NULL) |
8185d5aa BZ |
1685 | |
1686 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
1687 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
1688 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
1689 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
1690 | ||
97100fc8 | 1691 | ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); |
92f1f8fd | 1692 | |
92f1f8fd EO |
1693 | ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); |
1694 | ||
1695 | ide_tape_devset_r_field(avg_speed, avg_speed); | |
1696 | ide_tape_devset_r_field(speed, caps[14]); | |
1697 | ide_tape_devset_r_field(buffer, caps[16]); | |
1698 | ide_tape_devset_r_field(buffer_size, buffer_size); | |
1699 | ||
1700 | static const struct ide_proc_devset idetape_settings[] = { | |
1701 | __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), | |
1702 | __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), | |
1703 | __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), | |
92f1f8fd EO |
1704 | __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), |
1705 | __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), | |
1706 | __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
1707 | mulf_tdsc, divf_tdsc), | |
71bfc7a7 | 1708 | { NULL }, |
8185d5aa | 1709 | }; |
7662d046 | 1710 | #endif |
1da177e4 LT |
1711 | |
1712 | /* | |
3c98bf34 | 1713 | * The function below is called to: |
1da177e4 | 1714 | * |
3c98bf34 BP |
1715 | * 1. Initialize our various state variables. |
1716 | * 2. Ask the tape for its capabilities. | |
1717 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
1718 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 1719 | * |
3c98bf34 BP |
1720 | * Note that at this point ide.c already assigned us an irq, so that we can |
1721 | * queue requests here and wait for their completion. | |
1da177e4 | 1722 | */ |
5a04cfa9 | 1723 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 1724 | { |
83042b24 | 1725 | unsigned long t; |
1da177e4 | 1726 | int speed; |
f73850a3 | 1727 | int buffer_size; |
b6422013 | 1728 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 1729 | |
e972d702 BP |
1730 | ide_debug_log(IDE_DBG_FUNC, "minor: %d", minor); |
1731 | ||
1732 | drive->pc_callback = ide_tape_callback; | |
776bb027 | 1733 | |
97100fc8 BZ |
1734 | drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; |
1735 | ||
4166c199 BZ |
1736 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
1737 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
1738 | tape->name); | |
97100fc8 | 1739 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 1740 | } |
97100fc8 | 1741 | |
1da177e4 | 1742 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 1743 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
97100fc8 BZ |
1744 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1745 | ||
1da177e4 LT |
1746 | tape->minor = minor; |
1747 | tape->name[0] = 'h'; | |
1748 | tape->name[1] = 't'; | |
1749 | tape->name[2] = '0' + minor; | |
54abf37e | 1750 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
4dde4492 | 1751 | |
1da177e4 LT |
1752 | idetape_get_inquiry_results(drive); |
1753 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 1754 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 1755 | tape->user_bs_factor = 1; |
f73850a3 BP |
1756 | tape->buffer_size = *ctl * tape->blk_size; |
1757 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 1758 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 1759 | *ctl /= 2; |
f73850a3 | 1760 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 1761 | } |
f73850a3 | 1762 | buffer_size = tape->buffer_size; |
1da177e4 | 1763 | |
83042b24 | 1764 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 1765 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 1766 | |
f73850a3 | 1767 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
1768 | |
1769 | /* | |
3c98bf34 BP |
1770 | * Ensure that the number we got makes sense; limit it within |
1771 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 1772 | */ |
a792bd5a HH |
1773 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
1774 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 1775 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 1776 | "%lums tDSC%s\n", |
b6422013 | 1777 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
1778 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
1779 | tape->buffer_size / 1024, | |
54bb2074 | 1780 | tape->best_dsc_rw_freq * 1000 / HZ, |
97100fc8 | 1781 | (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); |
1da177e4 | 1782 | |
1e874f44 | 1783 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
1784 | } |
1785 | ||
4031bbe4 | 1786 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
1787 | { |
1788 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1789 | |
7662d046 | 1790 | ide_proc_unregister_driver(drive, tape->driver); |
8fed4368 | 1791 | device_del(&tape->dev); |
1da177e4 LT |
1792 | ide_unregister_region(tape->disk); |
1793 | ||
8fed4368 BZ |
1794 | mutex_lock(&idetape_ref_mutex); |
1795 | put_device(&tape->dev); | |
1796 | mutex_unlock(&idetape_ref_mutex); | |
1da177e4 LT |
1797 | } |
1798 | ||
8fed4368 | 1799 | static void ide_tape_release(struct device *dev) |
1da177e4 | 1800 | { |
8fed4368 | 1801 | struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); |
1da177e4 LT |
1802 | ide_drive_t *drive = tape->drive; |
1803 | struct gendisk *g = tape->disk; | |
1804 | ||
963da55c | 1805 | BUG_ON(tape->valid); |
8604affd | 1806 | |
97100fc8 | 1807 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 1808 | drive->driver_data = NULL; |
dbc1272e | 1809 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
1810 | device_destroy(idetape_sysfs_class, |
1811 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
1812 | idetape_devs[tape->minor] = NULL; |
1813 | g->private_data = NULL; | |
1814 | put_disk(g); | |
1815 | kfree(tape); | |
1816 | } | |
1817 | ||
ecfd80e4 | 1818 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
1819 | static int proc_idetape_read_name |
1820 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
1821 | { | |
1822 | ide_drive_t *drive = (ide_drive_t *) data; | |
1823 | idetape_tape_t *tape = drive->driver_data; | |
1824 | char *out = page; | |
1825 | int len; | |
1826 | ||
1827 | len = sprintf(out, "%s\n", tape->name); | |
1828 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
1829 | } | |
1830 | ||
1831 | static ide_proc_entry_t idetape_proc[] = { | |
1832 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
1833 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
1834 | { NULL, 0, NULL, NULL } | |
1835 | }; | |
79cb3803 BZ |
1836 | |
1837 | static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) | |
1838 | { | |
1839 | return idetape_proc; | |
1840 | } | |
1841 | ||
1842 | static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) | |
1843 | { | |
1844 | return idetape_settings; | |
1845 | } | |
1da177e4 LT |
1846 | #endif |
1847 | ||
4031bbe4 | 1848 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 1849 | |
7f3c868b | 1850 | static struct ide_driver idetape_driver = { |
8604affd | 1851 | .gen_driver = { |
4ef3b8f4 | 1852 | .owner = THIS_MODULE, |
8604affd BZ |
1853 | .name = "ide-tape", |
1854 | .bus = &ide_bus_type, | |
8604affd | 1855 | }, |
4031bbe4 RK |
1856 | .probe = ide_tape_probe, |
1857 | .remove = ide_tape_remove, | |
1da177e4 | 1858 | .version = IDETAPE_VERSION, |
1da177e4 | 1859 | .do_request = idetape_do_request, |
7662d046 | 1860 | #ifdef CONFIG_IDE_PROC_FS |
79cb3803 BZ |
1861 | .proc_entries = ide_tape_proc_entries, |
1862 | .proc_devsets = ide_tape_proc_devsets, | |
7662d046 | 1863 | #endif |
1da177e4 LT |
1864 | }; |
1865 | ||
3c98bf34 | 1866 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 1867 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
1868 | .owner = THIS_MODULE, |
1869 | .read = idetape_chrdev_read, | |
1870 | .write = idetape_chrdev_write, | |
1871 | .ioctl = idetape_chrdev_ioctl, | |
1872 | .open = idetape_chrdev_open, | |
1873 | .release = idetape_chrdev_release, | |
1874 | }; | |
1875 | ||
a4600f81 | 1876 | static int idetape_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 1877 | { |
9d01e4cd | 1878 | struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk, false, 0); |
1da177e4 | 1879 | |
5a04cfa9 | 1880 | if (!tape) |
1da177e4 LT |
1881 | return -ENXIO; |
1882 | ||
1da177e4 LT |
1883 | return 0; |
1884 | } | |
1885 | ||
a4600f81 | 1886 | static int idetape_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 1887 | { |
5aeddf90 | 1888 | struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); |
1da177e4 LT |
1889 | |
1890 | ide_tape_put(tape); | |
1da177e4 LT |
1891 | return 0; |
1892 | } | |
1893 | ||
a4600f81 | 1894 | static int idetape_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
1895 | unsigned int cmd, unsigned long arg) |
1896 | { | |
5aeddf90 | 1897 | struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); |
1da177e4 | 1898 | ide_drive_t *drive = tape->drive; |
1bddd9e6 | 1899 | int err = generic_ide_ioctl(drive, bdev, cmd, arg); |
1da177e4 LT |
1900 | if (err == -EINVAL) |
1901 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
1902 | return err; | |
1903 | } | |
1904 | ||
1905 | static struct block_device_operations idetape_block_ops = { | |
1906 | .owner = THIS_MODULE, | |
a4600f81 AV |
1907 | .open = idetape_open, |
1908 | .release = idetape_release, | |
1909 | .locked_ioctl = idetape_ioctl, | |
1da177e4 LT |
1910 | }; |
1911 | ||
4031bbe4 | 1912 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
1913 | { |
1914 | idetape_tape_t *tape; | |
1915 | struct gendisk *g; | |
1916 | int minor; | |
1917 | ||
e972d702 BP |
1918 | ide_debug_log(IDE_DBG_FUNC, "enter"); |
1919 | ||
1920 | if (!strstr(DRV_NAME, drive->driver_req)) | |
1da177e4 | 1921 | goto failed; |
2a924662 | 1922 | |
1da177e4 LT |
1923 | if (drive->media != ide_tape) |
1924 | goto failed; | |
2a924662 | 1925 | |
97100fc8 BZ |
1926 | if ((drive->dev_flags & IDE_DFLAG_ID_READ) && |
1927 | ide_check_atapi_device(drive, DRV_NAME) == 0) { | |
5a04cfa9 BP |
1928 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
1929 | " the driver\n", drive->name); | |
1da177e4 LT |
1930 | goto failed; |
1931 | } | |
5a04cfa9 | 1932 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 1933 | if (tape == NULL) { |
5a04cfa9 BP |
1934 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
1935 | drive->name); | |
1da177e4 LT |
1936 | goto failed; |
1937 | } | |
1938 | ||
1939 | g = alloc_disk(1 << PARTN_BITS); | |
1940 | if (!g) | |
1941 | goto out_free_tape; | |
1942 | ||
1943 | ide_init_disk(g, drive); | |
1944 | ||
8fed4368 BZ |
1945 | tape->dev.parent = &drive->gendev; |
1946 | tape->dev.release = ide_tape_release; | |
1947 | dev_set_name(&tape->dev, dev_name(&drive->gendev)); | |
1948 | ||
1949 | if (device_register(&tape->dev)) | |
1950 | goto out_free_disk; | |
1da177e4 LT |
1951 | |
1952 | tape->drive = drive; | |
1953 | tape->driver = &idetape_driver; | |
1954 | tape->disk = g; | |
1955 | ||
1956 | g->private_data = &tape->driver; | |
1957 | ||
1958 | drive->driver_data = tape; | |
1959 | ||
cf8b8975 | 1960 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
1961 | for (minor = 0; idetape_devs[minor]; minor++) |
1962 | ; | |
1963 | idetape_devs[minor] = tape; | |
cf8b8975 | 1964 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
1965 | |
1966 | idetape_setup(drive, tape, minor); | |
1967 | ||
3ee074bf GKH |
1968 | device_create(idetape_sysfs_class, &drive->gendev, |
1969 | MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); | |
1970 | device_create(idetape_sysfs_class, &drive->gendev, | |
1971 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
1972 | "n%s", tape->name); | |
d5dee80a | 1973 | |
1da177e4 LT |
1974 | g->fops = &idetape_block_ops; |
1975 | ide_register_region(g); | |
1976 | ||
1977 | return 0; | |
8604affd | 1978 | |
8fed4368 BZ |
1979 | out_free_disk: |
1980 | put_disk(g); | |
1da177e4 LT |
1981 | out_free_tape: |
1982 | kfree(tape); | |
1983 | failed: | |
8604affd | 1984 | return -ENODEV; |
1da177e4 LT |
1985 | } |
1986 | ||
5a04cfa9 | 1987 | static void __exit idetape_exit(void) |
1da177e4 | 1988 | { |
8604affd | 1989 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 1990 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
1991 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
1992 | } | |
1993 | ||
17514e8a | 1994 | static int __init idetape_init(void) |
1da177e4 | 1995 | { |
d5dee80a WD |
1996 | int error = 1; |
1997 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
1998 | if (IS_ERR(idetape_sysfs_class)) { | |
1999 | idetape_sysfs_class = NULL; | |
2000 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2001 | error = -EBUSY; | |
2002 | goto out; | |
2003 | } | |
2004 | ||
1da177e4 | 2005 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2006 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2007 | " interface\n"); | |
d5dee80a WD |
2008 | error = -EBUSY; |
2009 | goto out_free_class; | |
1da177e4 | 2010 | } |
d5dee80a WD |
2011 | |
2012 | error = driver_register(&idetape_driver.gen_driver); | |
2013 | if (error) | |
2014 | goto out_free_driver; | |
2015 | ||
2016 | return 0; | |
2017 | ||
2018 | out_free_driver: | |
2019 | driver_unregister(&idetape_driver.gen_driver); | |
2020 | out_free_class: | |
2021 | class_destroy(idetape_sysfs_class); | |
2022 | out: | |
2023 | return error; | |
1da177e4 LT |
2024 | } |
2025 | ||
263756ec | 2026 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2027 | module_init(idetape_init); |
2028 | module_exit(idetape_exit); | |
2029 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2030 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2031 | MODULE_LICENSE("GPL"); |