Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
5ce78af4 BP |
2 | * IDE ATAPI streaming tape driver. |
3 | * | |
59bca8cc BZ |
4 | * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> |
5 | * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz | |
1da177e4 | 6 | * |
1da177e4 LT |
7 | * This driver was constructed as a student project in the software laboratory |
8 | * of the faculty of electrical engineering in the Technion - Israel's | |
9 | * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. | |
10 | * | |
11 | * It is hereby placed under the terms of the GNU general public license. | |
12 | * (See linux/COPYING). | |
1da177e4 | 13 | * |
5ce78af4 BP |
14 | * For a historical changelog see |
15 | * Documentation/ide/ChangeLog.ide-tape.1995-2002 | |
1da177e4 LT |
16 | */ |
17 | ||
51509eec BZ |
18 | #define DRV_NAME "ide-tape" |
19 | ||
dfe79936 | 20 | #define IDETAPE_VERSION "1.20" |
1da177e4 | 21 | |
1da177e4 LT |
22 | #include <linux/module.h> |
23 | #include <linux/types.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/timer.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/interrupt.h> | |
9bae1ff3 | 30 | #include <linux/jiffies.h> |
1da177e4 | 31 | #include <linux/major.h> |
1da177e4 LT |
32 | #include <linux/errno.h> |
33 | #include <linux/genhd.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/pci.h> | |
36 | #include <linux/ide.h> | |
37 | #include <linux/smp_lock.h> | |
38 | #include <linux/completion.h> | |
39 | #include <linux/bitops.h> | |
cf8b8975 | 40 | #include <linux/mutex.h> |
90699ce2 | 41 | #include <scsi/scsi.h> |
1da177e4 LT |
42 | |
43 | #include <asm/byteorder.h> | |
c837cfa5 BP |
44 | #include <linux/irq.h> |
45 | #include <linux/uaccess.h> | |
46 | #include <linux/io.h> | |
1da177e4 | 47 | #include <asm/unaligned.h> |
1da177e4 LT |
48 | #include <linux/mtio.h> |
49 | ||
8004a8c9 BP |
50 | enum { |
51 | /* output errors only */ | |
52 | DBG_ERR = (1 << 0), | |
53 | /* output all sense key/asc */ | |
54 | DBG_SENSE = (1 << 1), | |
55 | /* info regarding all chrdev-related procedures */ | |
56 | DBG_CHRDEV = (1 << 2), | |
57 | /* all remaining procedures */ | |
58 | DBG_PROCS = (1 << 3), | |
8004a8c9 BP |
59 | }; |
60 | ||
61 | /* define to see debug info */ | |
62 | #define IDETAPE_DEBUG_LOG 0 | |
63 | ||
64 | #if IDETAPE_DEBUG_LOG | |
65 | #define debug_log(lvl, fmt, args...) \ | |
66 | { \ | |
67 | if (tape->debug_mask & lvl) \ | |
68 | printk(KERN_INFO "ide-tape: " fmt, ## args); \ | |
69 | } | |
70 | #else | |
71 | #define debug_log(lvl, fmt, args...) do {} while (0) | |
72 | #endif | |
73 | ||
1da177e4 | 74 | /**************************** Tunable parameters *****************************/ |
1da177e4 | 75 | /* |
3c98bf34 BP |
76 | * After each failed packet command we issue a request sense command and retry |
77 | * the packet command IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 78 | * |
3c98bf34 | 79 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
1da177e4 LT |
80 | */ |
81 | #define IDETAPE_MAX_PC_RETRIES 3 | |
82 | ||
1da177e4 | 83 | /* |
3c98bf34 BP |
84 | * The following parameter is used to select the point in the internal tape fifo |
85 | * in which we will start to refill the buffer. Decreasing the following | |
86 | * parameter will improve the system's latency and interactive response, while | |
87 | * using a high value might improve system throughput. | |
1da177e4 | 88 | */ |
3c98bf34 | 89 | #define IDETAPE_FIFO_THRESHOLD 2 |
1da177e4 LT |
90 | |
91 | /* | |
3c98bf34 | 92 | * DSC polling parameters. |
1da177e4 | 93 | * |
3c98bf34 BP |
94 | * Polling for DSC (a single bit in the status register) is a very important |
95 | * function in ide-tape. There are two cases in which we poll for DSC: | |
1da177e4 | 96 | * |
3c98bf34 BP |
97 | * 1. Before a read/write packet command, to ensure that we can transfer data |
98 | * from/to the tape's data buffers, without causing an actual media access. | |
99 | * In case the tape is not ready yet, we take out our request from the device | |
100 | * request queue, so that ide.c could service requests from the other device | |
101 | * on the same interface in the meantime. | |
1da177e4 | 102 | * |
3c98bf34 BP |
103 | * 2. After the successful initialization of a "media access packet command", |
104 | * which is a command that can take a long time to complete (the interval can | |
105 | * range from several seconds to even an hour). Again, we postpone our request | |
106 | * in the middle to free the bus for the other device. The polling frequency | |
107 | * here should be lower than the read/write frequency since those media access | |
108 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST | |
109 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD | |
110 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). | |
1da177e4 | 111 | * |
3c98bf34 BP |
112 | * We also set a timeout for the timer, in case something goes wrong. The |
113 | * timeout should be longer then the maximum execution time of a tape operation. | |
1da177e4 | 114 | */ |
3c98bf34 BP |
115 | |
116 | /* DSC timings. */ | |
1da177e4 LT |
117 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
118 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ | |
119 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ | |
120 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ | |
121 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ | |
122 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ | |
123 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ | |
124 | ||
125 | /*************************** End of tunable parameters ***********************/ | |
126 | ||
54abf37e BP |
127 | /* tape directions */ |
128 | enum { | |
129 | IDETAPE_DIR_NONE = (1 << 0), | |
130 | IDETAPE_DIR_READ = (1 << 1), | |
131 | IDETAPE_DIR_WRITE = (1 << 2), | |
132 | }; | |
1da177e4 | 133 | |
03056b90 BP |
134 | /* Tape door status */ |
135 | #define DOOR_UNLOCKED 0 | |
136 | #define DOOR_LOCKED 1 | |
137 | #define DOOR_EXPLICITLY_LOCKED 2 | |
138 | ||
139 | /* Some defines for the SPACE command */ | |
140 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
141 | #define IDETAPE_SPACE_TO_EOD 3 | |
142 | ||
143 | /* Some defines for the LOAD UNLOAD command */ | |
144 | #define IDETAPE_LU_LOAD_MASK 1 | |
145 | #define IDETAPE_LU_RETENSION_MASK 2 | |
146 | #define IDETAPE_LU_EOT_MASK 4 | |
147 | ||
03056b90 BP |
148 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ |
149 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
150 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
151 | ||
1da177e4 | 152 | /* |
3c98bf34 BP |
153 | * Most of our global data which we need to save even as we leave the driver due |
154 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
155 | */ |
156 | typedef struct ide_tape_obj { | |
7f3c868b BZ |
157 | ide_drive_t *drive; |
158 | struct ide_driver *driver; | |
159 | struct gendisk *disk; | |
8fed4368 | 160 | struct device dev; |
1da177e4 | 161 | |
2e8a6f89 BZ |
162 | /* used by REQ_IDETAPE_{READ,WRITE} requests */ |
163 | struct ide_atapi_pc queued_pc; | |
394a4c21 | 164 | |
1da177e4 | 165 | /* |
3c98bf34 | 166 | * DSC polling variables. |
1da177e4 | 167 | * |
3c98bf34 BP |
168 | * While polling for DSC we use postponed_rq to postpone the current |
169 | * request so that ide.c will be able to service pending requests on the | |
170 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 171 | * data transfer) request in the device request queue. |
1da177e4 LT |
172 | */ |
173 | struct request *postponed_rq; | |
174 | /* The time in which we started polling for DSC */ | |
175 | unsigned long dsc_polling_start; | |
176 | /* Timer used to poll for dsc */ | |
177 | struct timer_list dsc_timer; | |
178 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
179 | unsigned long best_dsc_rw_freq; |
180 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
181 | unsigned long dsc_timeout; |
182 | ||
3c98bf34 | 183 | /* Read position information */ |
1da177e4 LT |
184 | u8 partition; |
185 | /* Current block */ | |
54bb2074 | 186 | unsigned int first_frame; |
1da177e4 | 187 | |
3c98bf34 | 188 | /* Last error information */ |
1da177e4 LT |
189 | u8 sense_key, asc, ascq; |
190 | ||
3c98bf34 | 191 | /* Character device operation */ |
1da177e4 LT |
192 | unsigned int minor; |
193 | /* device name */ | |
194 | char name[4]; | |
195 | /* Current character device data transfer direction */ | |
54abf37e | 196 | u8 chrdev_dir; |
1da177e4 | 197 | |
54bb2074 BP |
198 | /* tape block size, usually 512 or 1024 bytes */ |
199 | unsigned short blk_size; | |
1da177e4 | 200 | int user_bs_factor; |
b6422013 | 201 | |
1da177e4 | 202 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 203 | u8 caps[20]; |
1da177e4 LT |
204 | |
205 | /* | |
3c98bf34 | 206 | * Active data transfer request parameters. |
1da177e4 | 207 | * |
3c98bf34 BP |
208 | * At most, there is only one ide-tape originated data transfer request |
209 | * in the device request queue. This allows ide.c to easily service | |
210 | * requests from the other device when we postpone our active request. | |
1da177e4 | 211 | */ |
83042b24 | 212 | |
3c98bf34 | 213 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 214 | int buffer_size; |
963da55c TH |
215 | /* Staging buffer of buffer_size bytes */ |
216 | void *buf; | |
217 | /* The read/write cursor */ | |
218 | void *cur; | |
219 | /* The number of valid bytes in buf */ | |
220 | size_t valid; | |
3c98bf34 | 221 | |
3c98bf34 | 222 | /* Measures average tape speed */ |
1da177e4 LT |
223 | unsigned long avg_time; |
224 | int avg_size; | |
225 | int avg_speed; | |
226 | ||
1da177e4 LT |
227 | /* the door is currently locked */ |
228 | int door_locked; | |
229 | /* the tape hardware is write protected */ | |
230 | char drv_write_prot; | |
231 | /* the tape is write protected (hardware or opened as read-only) */ | |
232 | char write_prot; | |
233 | ||
8004a8c9 | 234 | u32 debug_mask; |
1da177e4 LT |
235 | } idetape_tape_t; |
236 | ||
cf8b8975 | 237 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 238 | |
d5dee80a WD |
239 | static struct class *idetape_sysfs_class; |
240 | ||
8fed4368 | 241 | static void ide_tape_release(struct device *); |
08da591e | 242 | |
9d01e4cd BP |
243 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
244 | ||
245 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev, | |
246 | unsigned int i) | |
1da177e4 LT |
247 | { |
248 | struct ide_tape_obj *tape = NULL; | |
249 | ||
cf8b8975 | 250 | mutex_lock(&idetape_ref_mutex); |
9d01e4cd BP |
251 | |
252 | if (cdev) | |
253 | tape = idetape_devs[i]; | |
254 | else | |
255 | tape = ide_drv_g(disk, ide_tape_obj); | |
256 | ||
08da591e | 257 | if (tape) { |
d3e33ff5 | 258 | if (ide_device_get(tape->drive)) |
08da591e | 259 | tape = NULL; |
d3e33ff5 | 260 | else |
8fed4368 | 261 | get_device(&tape->dev); |
08da591e | 262 | } |
9d01e4cd | 263 | |
cf8b8975 | 264 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
265 | return tape; |
266 | } | |
267 | ||
1da177e4 LT |
268 | static void ide_tape_put(struct ide_tape_obj *tape) |
269 | { | |
d3e33ff5 BZ |
270 | ide_drive_t *drive = tape->drive; |
271 | ||
cf8b8975 | 272 | mutex_lock(&idetape_ref_mutex); |
8fed4368 | 273 | put_device(&tape->dev); |
d3e33ff5 | 274 | ide_device_put(drive); |
cf8b8975 | 275 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
276 | } |
277 | ||
1da177e4 | 278 | /* |
1b5db434 BP |
279 | * called on each failed packet command retry to analyze the request sense. We |
280 | * currently do not utilize this information. | |
1da177e4 | 281 | */ |
ae3a8387 | 282 | static void idetape_analyze_error(ide_drive_t *drive) |
1da177e4 LT |
283 | { |
284 | idetape_tape_t *tape = drive->driver_data; | |
5e2040fd | 285 | struct ide_atapi_pc *pc = drive->failed_pc; |
dfb7e621 | 286 | struct request *rq = drive->hwif->rq; |
ae3a8387 | 287 | u8 *sense = bio_data(rq->bio); |
1da177e4 | 288 | |
1b5db434 BP |
289 | tape->sense_key = sense[2] & 0xF; |
290 | tape->asc = sense[12]; | |
291 | tape->ascq = sense[13]; | |
8004a8c9 BP |
292 | |
293 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
294 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 295 | |
077e6dba | 296 | /* correct remaining bytes to transfer */ |
21d9c5d2 | 297 | if (pc->flags & PC_FLAG_DMA_ERROR) |
077e6dba | 298 | rq->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]); |
1da177e4 LT |
299 | |
300 | /* | |
301 | * If error was the result of a zero-length read or write command, | |
302 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
303 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
304 | */ | |
90699ce2 | 305 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
306 | /* length == 0 */ |
307 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
308 | if (tape->sense_key == 5) { | |
1da177e4 LT |
309 | /* don't report an error, everything's ok */ |
310 | pc->error = 0; | |
311 | /* don't retry read/write */ | |
346331f8 | 312 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
313 | } |
314 | } | |
90699ce2 | 315 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
c152cc1a | 316 | pc->error = IDE_DRV_ERROR_FILEMARK; |
346331f8 | 317 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 318 | } |
90699ce2 | 319 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
320 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
321 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
c152cc1a | 322 | pc->error = IDE_DRV_ERROR_EOD; |
346331f8 | 323 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
324 | } |
325 | } | |
90699ce2 | 326 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 327 | if (tape->sense_key == 8) { |
c152cc1a | 328 | pc->error = IDE_DRV_ERROR_EOD; |
346331f8 | 329 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 330 | } |
346331f8 | 331 | if (!(pc->flags & PC_FLAG_ABORT) && |
077e6dba | 332 | (blk_rq_bytes(rq) - rq->resid_len)) |
1da177e4 LT |
333 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
334 | } | |
335 | } | |
336 | ||
b14c7212 BZ |
337 | static void ide_tape_handle_dsc(ide_drive_t *); |
338 | ||
03a2faae | 339 | static int ide_tape_callback(ide_drive_t *drive, int dsc) |
1da177e4 LT |
340 | { |
341 | idetape_tape_t *tape = drive->driver_data; | |
2b9efba4 | 342 | struct ide_atapi_pc *pc = drive->pc; |
313afea7 | 343 | struct request *rq = drive->hwif->rq; |
5985e6ab | 344 | int uptodate = pc->error ? 0 : 1; |
313afea7 | 345 | int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; |
1da177e4 | 346 | |
8004a8c9 BP |
347 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
348 | ||
b14c7212 BZ |
349 | if (dsc) |
350 | ide_tape_handle_dsc(drive); | |
351 | ||
5e2040fd BZ |
352 | if (drive->failed_pc == pc) |
353 | drive->failed_pc = NULL; | |
dd2e9a03 | 354 | |
5985e6ab BZ |
355 | if (pc->c[0] == REQUEST_SENSE) { |
356 | if (uptodate) | |
ae3a8387 | 357 | idetape_analyze_error(drive); |
5985e6ab BZ |
358 | else |
359 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
360 | "itself - Aborting request!\n"); | |
361 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
077e6dba BP |
362 | unsigned int blocks = |
363 | (blk_rq_bytes(rq) - rq->resid_len) / tape->blk_size; | |
5985e6ab BZ |
364 | |
365 | tape->avg_size += blocks * tape->blk_size; | |
366 | ||
367 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
368 | tape->avg_speed = tape->avg_size * HZ / | |
369 | (jiffies - tape->avg_time) / 1024; | |
370 | tape->avg_size = 0; | |
371 | tape->avg_time = jiffies; | |
372 | } | |
373 | ||
374 | tape->first_frame += blocks; | |
5985e6ab | 375 | |
313afea7 BZ |
376 | if (pc->error) { |
377 | uptodate = 0; | |
378 | err = pc->error; | |
379 | } | |
1da177e4 | 380 | } |
313afea7 BZ |
381 | rq->errors = err; |
382 | ||
03a2faae | 383 | return uptodate; |
1da177e4 LT |
384 | } |
385 | ||
1da177e4 | 386 | /* |
3c98bf34 | 387 | * Postpone the current request so that ide.c will be able to service requests |
b65fac32 | 388 | * from another device on the same port while we are polling for DSC. |
1da177e4 | 389 | */ |
5a04cfa9 | 390 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
391 | { |
392 | idetape_tape_t *tape = drive->driver_data; | |
393 | ||
8004a8c9 BP |
394 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
395 | ||
b65fac32 BZ |
396 | tape->postponed_rq = drive->hwif->rq; |
397 | ||
54bb2074 | 398 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
399 | } |
400 | ||
74e63e74 BZ |
401 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
402 | { | |
403 | idetape_tape_t *tape = drive->driver_data; | |
404 | ||
405 | /* Media access command */ | |
406 | tape->dsc_polling_start = jiffies; | |
407 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
408 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
409 | /* Allow ide.c to handle other requests */ | |
410 | idetape_postpone_request(drive); | |
411 | } | |
412 | ||
1da177e4 | 413 | /* |
3c98bf34 | 414 | * Packet Command Interface |
1da177e4 | 415 | * |
2b9efba4 | 416 | * The current Packet Command is available in drive->pc, and will not change |
3c98bf34 BP |
417 | * until we finish handling it. Each packet command is associated with a |
418 | * callback function that will be called when the command is finished. | |
1da177e4 | 419 | * |
3c98bf34 | 420 | * The handling will be done in three stages: |
1da177e4 | 421 | * |
b788ee9c | 422 | * 1. ide_tape_issue_pc will send the packet command to the drive, and will set |
aa5d2de7 | 423 | * the interrupt handler to ide_pc_intr. |
1da177e4 | 424 | * |
aa5d2de7 | 425 | * 2. On each interrupt, ide_pc_intr will be called. This step will be |
3c98bf34 | 426 | * repeated until the device signals us that no more interrupts will be issued. |
1da177e4 | 427 | * |
3c98bf34 BP |
428 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
429 | * process. In case of a successful initiation of a media access packet command, | |
430 | * the DSC bit will be set when the actual execution of the command is finished. | |
431 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
432 | * event. In this case, we define the request as "low priority request" by | |
433 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
434 | * exit the driver. | |
1da177e4 | 435 | * |
3c98bf34 BP |
436 | * ide.c will then give higher priority to requests which originate from the |
437 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 438 | * |
3c98bf34 | 439 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 440 | * |
3c98bf34 BP |
441 | * 5. In case an error was found, we queue a request sense packet command in |
442 | * front of the request queue and retry the operation up to | |
443 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 444 | * |
3c98bf34 BP |
445 | * 6. In case no error was found, or we decided to give up and not to retry |
446 | * again, the callback function will be called and then we will handle the next | |
447 | * request. | |
1da177e4 | 448 | */ |
1da177e4 | 449 | |
b788ee9c BZ |
450 | static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, |
451 | struct ide_cmd *cmd, | |
452 | struct ide_atapi_pc *pc) | |
1da177e4 | 453 | { |
1da177e4 | 454 | idetape_tape_t *tape = drive->driver_data; |
dfb7e621 | 455 | struct request *rq = drive->hwif->rq; |
1da177e4 | 456 | |
5e2040fd BZ |
457 | if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
458 | drive->failed_pc = pc; | |
2b9efba4 | 459 | |
1da177e4 | 460 | /* Set the current packet command */ |
2b9efba4 | 461 | drive->pc = pc; |
1da177e4 LT |
462 | |
463 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 464 | (pc->flags & PC_FLAG_ABORT)) { |
b3071d19 | 465 | |
1da177e4 | 466 | /* |
3c98bf34 BP |
467 | * We will "abort" retrying a packet command in case legitimate |
468 | * error code was received (crossing a filemark, or end of the | |
469 | * media, for example). | |
1da177e4 | 470 | */ |
346331f8 | 471 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 472 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
473 | tape->sense_key == 2 && tape->asc == 4 && |
474 | (tape->ascq == 1 || tape->ascq == 8))) { | |
475 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
476 | "pc = %2x, key = %2x, " | |
477 | "asc = %2x, ascq = %2x\n", | |
478 | tape->name, pc->c[0], | |
479 | tape->sense_key, tape->asc, | |
480 | tape->ascq); | |
481 | } | |
482 | /* Giving up */ | |
c152cc1a | 483 | pc->error = IDE_DRV_ERROR_GENERAL; |
1da177e4 | 484 | } |
b3071d19 | 485 | |
5e2040fd | 486 | drive->failed_pc = NULL; |
b14c7212 | 487 | drive->pc_callback(drive, 0); |
dfb7e621 | 488 | ide_complete_rq(drive, -EIO, blk_rq_bytes(rq)); |
92f5daff | 489 | return ide_stopped; |
1da177e4 | 490 | } |
8004a8c9 | 491 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
492 | |
493 | pc->retries++; | |
1da177e4 | 494 | |
b788ee9c | 495 | return ide_issue_pc(drive, cmd); |
1da177e4 LT |
496 | } |
497 | ||
3c98bf34 | 498 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 499 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 | 500 | { |
7bf7420a | 501 | ide_init_pc(pc); |
90699ce2 | 502 | pc->c[0] = MODE_SENSE; |
1da177e4 | 503 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
504 | /* DBD = 1 - Don't return block descriptors */ |
505 | pc->c[1] = 8; | |
1da177e4 LT |
506 | pc->c[2] = page_code; |
507 | /* | |
508 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
509 | * | |
510 | * For SCSI this byte is defined as subpage instead of high byte | |
511 | * of length and some IDE drives seem to interpret it this way | |
512 | * and return an error when 255 is used. | |
513 | */ | |
514 | pc->c[3] = 0; | |
3c98bf34 BP |
515 | /* We will just discard data in that case */ |
516 | pc->c[4] = 255; | |
1da177e4 | 517 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 518 | pc->req_xfer = 12; |
1da177e4 | 519 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 520 | pc->req_xfer = 24; |
1da177e4 | 521 | else |
d236d74c | 522 | pc->req_xfer = 50; |
1da177e4 LT |
523 | } |
524 | ||
5a04cfa9 | 525 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 526 | { |
b73c7ee2 | 527 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 528 | idetape_tape_t *tape = drive->driver_data; |
2b9efba4 | 529 | struct ide_atapi_pc *pc = drive->pc; |
22c525b9 | 530 | u8 stat; |
1da177e4 | 531 | |
374e042c | 532 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 533 | |
3a7d2484 BZ |
534 | if (stat & ATA_DSC) { |
535 | if (stat & ATA_ERR) { | |
1da177e4 | 536 | /* Error detected */ |
90699ce2 | 537 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
538 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
539 | tape->name); | |
540 | /* Retry operation */ | |
6b544fcc | 541 | ide_retry_pc(drive); |
258ec411 | 542 | return ide_stopped; |
1da177e4 LT |
543 | } |
544 | pc->error = 0; | |
1da177e4 | 545 | } else { |
c152cc1a | 546 | pc->error = IDE_DRV_ERROR_GENERAL; |
5e2040fd | 547 | drive->failed_pc = NULL; |
1da177e4 | 548 | } |
b14c7212 | 549 | drive->pc_callback(drive, 0); |
1da177e4 LT |
550 | return ide_stopped; |
551 | } | |
552 | ||
cd2abbfe | 553 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
554 | struct ide_atapi_pc *pc, struct request *rq, |
555 | u8 opcode) | |
1da177e4 | 556 | { |
10c0b343 | 557 | unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9); |
0014c75b | 558 | |
7bf7420a | 559 | ide_init_pc(pc); |
860ff5ec | 560 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 561 | pc->c[1] = 1; |
19f52a78 BP |
562 | |
563 | if (blk_rq_bytes(rq) == tape->buffer_size) | |
5e331095 | 564 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 565 | |
963da55c | 566 | if (opcode == READ_6) |
cd2abbfe | 567 | pc->c[0] = READ_6; |
963da55c | 568 | else if (opcode == WRITE_6) { |
cd2abbfe BP |
569 | pc->c[0] = WRITE_6; |
570 | pc->flags |= PC_FLAG_WRITING; | |
cd2abbfe | 571 | } |
0014c75b BP |
572 | |
573 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
574 | } |
575 | ||
1da177e4 LT |
576 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
577 | struct request *rq, sector_t block) | |
578 | { | |
b73c7ee2 | 579 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 580 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 581 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 582 | struct request *postponed_rq = tape->postponed_rq; |
b788ee9c | 583 | struct ide_cmd cmd; |
22c525b9 | 584 | u8 stat; |
1da177e4 | 585 | |
9780e2dd TH |
586 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %u\n" |
587 | (unsigned long long)blk_rq_pos(rq), blk_rq_sectors(rq)); | |
1da177e4 | 588 | |
2c7eaa43 | 589 | BUG_ON(!(blk_special_request(rq) || blk_sense_request(rq))); |
1da177e4 | 590 | |
3c98bf34 | 591 | /* Retry a failed packet command */ |
5e2040fd BZ |
592 | if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { |
593 | pc = drive->failed_pc; | |
28c7214b BZ |
594 | goto out; |
595 | } | |
5a04cfa9 | 596 | |
1da177e4 LT |
597 | if (postponed_rq != NULL) |
598 | if (rq != postponed_rq) { | |
599 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
600 | "Two DSC requests were queued\n"); | |
313afea7 | 601 | drive->failed_pc = NULL; |
6902a533 | 602 | rq->errors = 0; |
f974b196 | 603 | ide_complete_rq(drive, 0, blk_rq_bytes(rq)); |
1da177e4 LT |
604 | return ide_stopped; |
605 | } | |
1da177e4 LT |
606 | |
607 | tape->postponed_rq = NULL; | |
608 | ||
609 | /* | |
610 | * If the tape is still busy, postpone our request and service | |
611 | * the other device meanwhile. | |
612 | */ | |
374e042c | 613 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 614 | |
97100fc8 BZ |
615 | if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && |
616 | (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) | |
626542ca | 617 | drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; |
1da177e4 | 618 | |
97100fc8 | 619 | if (drive->dev_flags & IDE_DFLAG_POST_RESET) { |
626542ca | 620 | drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; |
97100fc8 | 621 | drive->dev_flags &= ~IDE_DFLAG_POST_RESET; |
1da177e4 LT |
622 | } |
623 | ||
626542ca BP |
624 | if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) && |
625 | !(stat & ATA_DSC)) { | |
1da177e4 LT |
626 | if (postponed_rq == NULL) { |
627 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 628 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
629 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
630 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
631 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
632 | tape->name); | |
83dd5735 | 633 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
634 | idetape_media_access_finished(drive); |
635 | return ide_stopped; | |
636 | } else { | |
637 | return ide_do_reset(drive); | |
638 | } | |
5a04cfa9 BP |
639 | } else if (time_after(jiffies, |
640 | tape->dsc_polling_start + | |
641 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 642 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
643 | idetape_postpone_request(drive); |
644 | return ide_stopped; | |
626542ca BP |
645 | } else |
646 | drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC; | |
647 | ||
83dd5735 | 648 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
2e8a6f89 | 649 | pc = &tape->queued_pc; |
0014c75b | 650 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
651 | goto out; |
652 | } | |
83dd5735 | 653 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
2e8a6f89 | 654 | pc = &tape->queued_pc; |
0014c75b | 655 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
656 | goto out; |
657 | } | |
83dd5735 | 658 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
c267cc1c | 659 | pc = (struct ide_atapi_pc *)rq->special; |
83dd5735 BP |
660 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
661 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
662 | goto out; |
663 | } | |
83dd5735 | 664 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
665 | idetape_media_access_finished(drive); |
666 | return ide_stopped; | |
667 | } | |
668 | BUG(); | |
28c7214b | 669 | |
f2e3ab52 | 670 | out: |
6b544fcc BP |
671 | /* prepare sense request for this command */ |
672 | ide_prep_sense(drive, rq); | |
673 | ||
b788ee9c BZ |
674 | memset(&cmd, 0, sizeof(cmd)); |
675 | ||
676 | if (rq_data_dir(rq)) | |
677 | cmd.tf_flags |= IDE_TFLAG_WRITE; | |
678 | ||
679 | cmd.rq = rq; | |
680 | ||
dfb7e621 | 681 | ide_init_sg_cmd(&cmd, blk_rq_bytes(rq)); |
5c4be572 TH |
682 | ide_map_sg(drive, &cmd); |
683 | ||
b788ee9c | 684 | return ide_tape_issue_pc(drive, &cmd, pc); |
1da177e4 LT |
685 | } |
686 | ||
1da177e4 | 687 | /* |
3c98bf34 BP |
688 | * Write a filemark if write_filemark=1. Flush the device buffers without |
689 | * writing a filemark otherwise. | |
1da177e4 | 690 | */ |
5a04cfa9 | 691 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 692 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 | 693 | { |
7bf7420a | 694 | ide_init_pc(pc); |
90699ce2 | 695 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 696 | pc->c[4] = write_filemark; |
346331f8 | 697 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
698 | } |
699 | ||
1da177e4 LT |
700 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
701 | { | |
702 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 703 | struct gendisk *disk = tape->disk; |
1da177e4 LT |
704 | int load_attempted = 0; |
705 | ||
3c98bf34 | 706 | /* Wait for the tape to become ready */ |
49d8078a | 707 | set_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), &drive->atapi_flags); |
1da177e4 LT |
708 | timeout += jiffies; |
709 | while (time_before(jiffies, timeout)) { | |
de699ad5 | 710 | if (ide_do_test_unit_ready(drive, disk) == 0) |
1da177e4 LT |
711 | return 0; |
712 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
713 | || (tape->asc == 0x3A)) { |
714 | /* no media */ | |
1da177e4 LT |
715 | if (load_attempted) |
716 | return -ENOMEDIUM; | |
0c8a6c7a | 717 | ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
1da177e4 LT |
718 | load_attempted = 1; |
719 | /* not about to be ready */ | |
720 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
721 | (tape->ascq == 1 || tape->ascq == 8))) | |
722 | return -EIO; | |
80ce45fd | 723 | msleep(100); |
1da177e4 LT |
724 | } |
725 | return -EIO; | |
726 | } | |
727 | ||
5a04cfa9 | 728 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 729 | { |
2ac07d92 | 730 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 731 | struct ide_atapi_pc pc; |
1da177e4 LT |
732 | int rc; |
733 | ||
734 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
b13345f3 | 735 | rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0); |
5a04cfa9 | 736 | if (rc) |
1da177e4 LT |
737 | return rc; |
738 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
739 | return 0; | |
740 | } | |
741 | ||
55ce3a12 | 742 | static int ide_tape_read_position(ide_drive_t *drive) |
1da177e4 LT |
743 | { |
744 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 745 | struct ide_atapi_pc pc; |
55ce3a12 | 746 | u8 buf[20]; |
1da177e4 | 747 | |
8004a8c9 | 748 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 | 749 | |
55ce3a12 BP |
750 | /* prep cmd */ |
751 | ide_init_pc(&pc); | |
752 | pc.c[0] = READ_POSITION; | |
753 | pc.req_xfer = 20; | |
754 | ||
755 | if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) | |
1da177e4 | 756 | return -1; |
55ce3a12 BP |
757 | |
758 | if (!pc.error) { | |
759 | debug_log(DBG_SENSE, "BOP - %s\n", | |
760 | (buf[0] & 0x80) ? "Yes" : "No"); | |
761 | debug_log(DBG_SENSE, "EOP - %s\n", | |
762 | (buf[0] & 0x40) ? "Yes" : "No"); | |
763 | ||
764 | if (buf[0] & 0x4) { | |
765 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
766 | "to the tape\n"); | |
8dcce408 BZ |
767 | clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), |
768 | &drive->atapi_flags); | |
55ce3a12 BP |
769 | return -1; |
770 | } else { | |
771 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
772 | be32_to_cpup((__be32 *)&buf[4])); | |
773 | ||
774 | tape->partition = buf[1]; | |
775 | tape->first_frame = be32_to_cpup((__be32 *)&buf[4]); | |
8dcce408 BZ |
776 | set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), |
777 | &drive->atapi_flags); | |
55ce3a12 BP |
778 | } |
779 | } | |
780 | ||
781 | return tape->first_frame; | |
1da177e4 LT |
782 | } |
783 | ||
d236d74c BP |
784 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
785 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 786 | unsigned int block, u8 partition, int skip) |
1da177e4 | 787 | { |
7bf7420a | 788 | ide_init_pc(pc); |
90699ce2 | 789 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 790 | pc->c[1] = 2; |
860ff5ec | 791 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 792 | pc->c[8] = partition; |
346331f8 | 793 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
794 | } |
795 | ||
ec0fdb01 | 796 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
797 | { |
798 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 799 | |
54abf37e | 800 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 801 | return; |
1da177e4 | 802 | |
49d8078a | 803 | clear_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags); |
963da55c TH |
804 | tape->valid = 0; |
805 | if (tape->buf != NULL) { | |
806 | kfree(tape->buf); | |
807 | tape->buf = NULL; | |
1da177e4 LT |
808 | } |
809 | ||
54abf37e | 810 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
811 | } |
812 | ||
813 | /* | |
3c98bf34 BP |
814 | * Position the tape to the requested block using the LOCATE packet command. |
815 | * A READ POSITION command is then issued to check where we are positioned. Like | |
816 | * all higher level operations, we queue the commands at the tail of the request | |
817 | * queue and wait for their completion. | |
1da177e4 | 818 | */ |
5a04cfa9 BP |
819 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
820 | u8 partition, int skip) | |
1da177e4 LT |
821 | { |
822 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 823 | struct gendisk *disk = tape->disk; |
55ce3a12 | 824 | int ret; |
d236d74c | 825 | struct ide_atapi_pc pc; |
1da177e4 | 826 | |
54abf37e | 827 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 828 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
829 | idetape_wait_ready(drive, 60 * 5 * HZ); |
830 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
55ce3a12 BP |
831 | ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
832 | if (ret) | |
833 | return ret; | |
1da177e4 | 834 | |
55ce3a12 BP |
835 | ret = ide_tape_read_position(drive); |
836 | if (ret < 0) | |
837 | return ret; | |
838 | return 0; | |
1da177e4 LT |
839 | } |
840 | ||
ec0fdb01 | 841 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 842 | int restore_position) |
1da177e4 LT |
843 | { |
844 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
845 | int seek, position; |
846 | ||
ec0fdb01 | 847 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 | 848 | if (restore_position) { |
55ce3a12 | 849 | position = ide_tape_read_position(drive); |
9798630a | 850 | seek = position > 0 ? position : 0; |
1da177e4 | 851 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 852 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 853 | " %s\n", tape->name, __func__); |
1da177e4 LT |
854 | return; |
855 | } | |
856 | } | |
857 | } | |
858 | ||
859 | /* | |
3c98bf34 BP |
860 | * Generate a read/write request for the block device interface and wait for it |
861 | * to be serviced. | |
1da177e4 | 862 | */ |
6bb11dd1 | 863 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) |
1da177e4 LT |
864 | { |
865 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a | 866 | struct request *rq; |
21d9c5d2 | 867 | int ret; |
1da177e4 | 868 | |
8004a8c9 | 869 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
21d9c5d2 | 870 | BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); |
6bb11dd1 | 871 | BUG_ON(size < 0 || size % tape->blk_size); |
8004a8c9 | 872 | |
64ea1b4a FT |
873 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
874 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 875 | rq->cmd[13] = cmd; |
64ea1b4a | 876 | rq->rq_disk = tape->disk; |
c9059598 | 877 | rq->__sector = tape->first_frame; |
21d9c5d2 TH |
878 | |
879 | if (size) { | |
963da55c | 880 | ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, |
21d9c5d2 TH |
881 | __GFP_WAIT); |
882 | if (ret) | |
883 | goto out_put; | |
884 | } | |
885 | ||
64ea1b4a FT |
886 | blk_execute_rq(drive->queue, tape->disk, rq, 0); |
887 | ||
963da55c | 888 | /* calculate the number of transferred bytes and update buffer state */ |
c3a4d78c | 889 | size -= rq->resid_len; |
963da55c | 890 | tape->cur = tape->buf; |
21d9c5d2 | 891 | if (cmd == REQ_IDETAPE_READ) |
963da55c TH |
892 | tape->valid = size; |
893 | else | |
894 | tape->valid = 0; | |
1da177e4 | 895 | |
21d9c5d2 TH |
896 | ret = size; |
897 | if (rq->errors == IDE_DRV_ERROR_GENERAL) | |
898 | ret = -EIO; | |
21d9c5d2 TH |
899 | out_put: |
900 | blk_put_request(rq); | |
64ea1b4a | 901 | return ret; |
1da177e4 LT |
902 | } |
903 | ||
d236d74c | 904 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 905 | { |
7bf7420a | 906 | ide_init_pc(pc); |
90699ce2 | 907 | pc->c[0] = INQUIRY; |
5a04cfa9 | 908 | pc->c[4] = 254; |
d236d74c | 909 | pc->req_xfer = 254; |
1da177e4 LT |
910 | } |
911 | ||
d236d74c BP |
912 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
913 | struct ide_atapi_pc *pc) | |
1da177e4 | 914 | { |
7bf7420a | 915 | ide_init_pc(pc); |
90699ce2 | 916 | pc->c[0] = REZERO_UNIT; |
346331f8 | 917 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
918 | } |
919 | ||
d236d74c | 920 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 921 | { |
7bf7420a | 922 | ide_init_pc(pc); |
90699ce2 | 923 | pc->c[0] = ERASE; |
1da177e4 | 924 | pc->c[1] = 1; |
346331f8 | 925 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
926 | } |
927 | ||
d236d74c | 928 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 | 929 | { |
7bf7420a | 930 | ide_init_pc(pc); |
90699ce2 | 931 | pc->c[0] = SPACE; |
860ff5ec | 932 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 933 | pc->c[1] = cmd; |
346331f8 | 934 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
935 | } |
936 | ||
d9df937a | 937 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
938 | { |
939 | idetape_tape_t *tape = drive->driver_data; | |
55a5d291 | 940 | |
54abf37e | 941 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 942 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 943 | " but we are not writing.\n"); |
1da177e4 LT |
944 | return; |
945 | } | |
963da55c | 946 | if (tape->buf) { |
6bb11dd1 TH |
947 | size_t aligned = roundup(tape->valid, tape->blk_size); |
948 | ||
949 | memset(tape->cur, 0, aligned - tape->valid); | |
07bd9686 | 950 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned); |
963da55c TH |
951 | kfree(tape->buf); |
952 | tape->buf = NULL; | |
1da177e4 | 953 | } |
54abf37e | 954 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
955 | } |
956 | ||
88f1b941 | 957 | static int idetape_init_rw(ide_drive_t *drive, int dir) |
1da177e4 LT |
958 | { |
959 | idetape_tape_t *tape = drive->driver_data; | |
88f1b941 | 960 | int rc; |
1da177e4 | 961 | |
88f1b941 | 962 | BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); |
1da177e4 | 963 | |
88f1b941 TH |
964 | if (tape->chrdev_dir == dir) |
965 | return 0; | |
966 | ||
967 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
968 | ide_tape_discard_merge_buffer(drive, 1); | |
969 | else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
970 | ide_tape_flush_merge_buffer(drive); | |
971 | idetape_flush_tape_buffers(drive); | |
972 | } | |
973 | ||
974 | if (tape->buf || tape->valid) { | |
975 | printk(KERN_ERR "ide-tape: valid should be 0 now\n"); | |
976 | tape->valid = 0; | |
977 | } | |
978 | ||
979 | tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); | |
980 | if (!tape->buf) | |
981 | return -ENOMEM; | |
982 | tape->chrdev_dir = dir; | |
983 | tape->cur = tape->buf; | |
984 | ||
985 | /* | |
986 | * Issue a 0 rw command to ensure that DSC handshake is | |
987 | * switched from completion mode to buffer available mode. No | |
988 | * point in issuing this if DSC overlap isn't supported, some | |
989 | * drives (Seagate STT3401A) will return an error. | |
990 | */ | |
991 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { | |
992 | int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ | |
993 | : REQ_IDETAPE_WRITE; | |
994 | ||
995 | rc = idetape_queue_rw_tail(drive, cmd, 0); | |
996 | if (rc < 0) { | |
997 | kfree(tape->buf); | |
998 | tape->buf = NULL; | |
999 | tape->chrdev_dir = IDETAPE_DIR_NONE; | |
1000 | return rc; | |
1da177e4 LT |
1001 | } |
1002 | } | |
5e69bd95 | 1003 | |
1da177e4 LT |
1004 | return 0; |
1005 | } | |
1006 | ||
5a04cfa9 | 1007 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1008 | { |
1009 | idetape_tape_t *tape = drive->driver_data; | |
963da55c TH |
1010 | |
1011 | memset(tape->buf, 0, tape->buffer_size); | |
3c98bf34 | 1012 | |
1da177e4 | 1013 | while (bcount) { |
963da55c | 1014 | unsigned int count = min(tape->buffer_size, bcount); |
1da177e4 | 1015 | |
6bb11dd1 | 1016 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); |
1da177e4 | 1017 | bcount -= count; |
1da177e4 LT |
1018 | } |
1019 | } | |
1020 | ||
1da177e4 | 1021 | /* |
3c98bf34 BP |
1022 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1023 | * currently support only one partition. | |
1024 | */ | |
5a04cfa9 | 1025 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 | 1026 | { |
2ac07d92 BZ |
1027 | struct ide_tape_obj *tape = drive->driver_data; |
1028 | struct gendisk *disk = tape->disk; | |
d236d74c | 1029 | struct ide_atapi_pc pc; |
55ce3a12 | 1030 | int ret; |
8004a8c9 BP |
1031 | |
1032 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1033 | ||
1da177e4 | 1034 | idetape_create_rewind_cmd(drive, &pc); |
55ce3a12 BP |
1035 | ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
1036 | if (ret) | |
1037 | return ret; | |
1da177e4 | 1038 | |
55ce3a12 BP |
1039 | ret = ide_tape_read_position(drive); |
1040 | if (ret < 0) | |
1041 | return ret; | |
1da177e4 LT |
1042 | return 0; |
1043 | } | |
1044 | ||
3c98bf34 | 1045 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1046 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1047 | unsigned long arg) | |
1da177e4 LT |
1048 | { |
1049 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1050 | void __user *argp = (void __user *)arg; |
1051 | ||
d59823fa BP |
1052 | struct idetape_config { |
1053 | int dsc_rw_frequency; | |
1054 | int dsc_media_access_frequency; | |
1055 | int nr_stages; | |
1056 | } config; | |
1057 | ||
8004a8c9 BP |
1058 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1059 | ||
1da177e4 | 1060 | switch (cmd) { |
5a04cfa9 BP |
1061 | case 0x0340: |
1062 | if (copy_from_user(&config, argp, sizeof(config))) | |
1063 | return -EFAULT; | |
1064 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1065 | break; |
1066 | case 0x0350: | |
2fc2111c | 1067 | memset(&config, 0, sizeof(config)); |
5a04cfa9 | 1068 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; |
83042b24 | 1069 | config.nr_stages = 1; |
5a04cfa9 BP |
1070 | if (copy_to_user(argp, &config, sizeof(config))) |
1071 | return -EFAULT; | |
1072 | break; | |
1073 | default: | |
1074 | return -EIO; | |
1da177e4 LT |
1075 | } |
1076 | return 0; | |
1077 | } | |
1078 | ||
5a04cfa9 BP |
1079 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1080 | int mt_count) | |
1da177e4 LT |
1081 | { |
1082 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1083 | struct gendisk *disk = tape->disk; |
d236d74c | 1084 | struct ide_atapi_pc pc; |
5a04cfa9 | 1085 | int retval, count = 0; |
b6422013 | 1086 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1087 | |
1088 | if (mt_count == 0) | |
1089 | return 0; | |
1090 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1091 | if (!sprev) |
1da177e4 | 1092 | return -EIO; |
5a04cfa9 | 1093 | mt_count = -mt_count; |
1da177e4 LT |
1094 | } |
1095 | ||
54abf37e | 1096 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
963da55c | 1097 | tape->valid = 0; |
49d8078a BP |
1098 | if (test_and_clear_bit(ilog2(IDE_AFLAG_FILEMARK), |
1099 | &drive->atapi_flags)) | |
1da177e4 | 1100 | ++count; |
ec0fdb01 | 1101 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1102 | } |
1103 | ||
1da177e4 | 1104 | switch (mt_op) { |
5a04cfa9 BP |
1105 | case MTFSF: |
1106 | case MTBSF: | |
1107 | idetape_create_space_cmd(&pc, mt_count - count, | |
1108 | IDETAPE_SPACE_OVER_FILEMARK); | |
b13345f3 | 1109 | return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
5a04cfa9 BP |
1110 | case MTFSFM: |
1111 | case MTBSFM: | |
1112 | if (!sprev) | |
1113 | return -EIO; | |
1114 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1115 | mt_count - count); | |
1116 | if (retval) | |
1117 | return retval; | |
1118 | count = (MTBSFM == mt_op ? 1 : -1); | |
1119 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1120 | default: | |
1121 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1122 | mt_op); | |
1123 | return -EIO; | |
1da177e4 LT |
1124 | } |
1125 | } | |
1126 | ||
1da177e4 | 1127 | /* |
3c98bf34 | 1128 | * Our character device read / write functions. |
1da177e4 | 1129 | * |
3c98bf34 BP |
1130 | * The tape is optimized to maximize throughput when it is transferring an |
1131 | * integral number of the "continuous transfer limit", which is a parameter of | |
1132 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1133 | * |
3c98bf34 BP |
1134 | * As of version 1.3 of the driver, the character device provides an abstract |
1135 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1136 | * same backup/restore procedure is supported. The driver will internally | |
1137 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1138 | * between the user's block size to the recommended size will only result in a | |
1139 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1140 | * This is not applicable to Onstream. | |
1da177e4 | 1141 | */ |
5a04cfa9 BP |
1142 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1143 | size_t count, loff_t *ppos) | |
1da177e4 | 1144 | { |
5aeddf90 | 1145 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1146 | ide_drive_t *drive = tape->drive; |
07bd9686 | 1147 | size_t done = 0; |
dcd96379 | 1148 | ssize_t ret = 0; |
07bd9686 | 1149 | int rc; |
1da177e4 | 1150 | |
8004a8c9 | 1151 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1152 | |
54abf37e | 1153 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
49d8078a | 1154 | if (test_bit(ilog2(IDE_AFLAG_DETECT_BS), &drive->atapi_flags)) |
54bb2074 BP |
1155 | if (count > tape->blk_size && |
1156 | (count % tape->blk_size) == 0) | |
1157 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1158 | } |
07bd9686 | 1159 | |
88f1b941 | 1160 | rc = idetape_init_rw(drive, IDETAPE_DIR_READ); |
8d06bfad | 1161 | if (rc < 0) |
1da177e4 | 1162 | return rc; |
07bd9686 TH |
1163 | |
1164 | while (done < count) { | |
1165 | size_t todo; | |
1166 | ||
1167 | /* refill if staging buffer is empty */ | |
1168 | if (!tape->valid) { | |
1169 | /* If we are at a filemark, nothing more to read */ | |
49d8078a BP |
1170 | if (test_bit(ilog2(IDE_AFLAG_FILEMARK), |
1171 | &drive->atapi_flags)) | |
07bd9686 TH |
1172 | break; |
1173 | /* read */ | |
1174 | if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, | |
1175 | tape->buffer_size) <= 0) | |
1176 | break; | |
1177 | } | |
1178 | ||
1179 | /* copy out */ | |
1180 | todo = min_t(size_t, count - done, tape->valid); | |
1181 | if (copy_to_user(buf + done, tape->cur, todo)) | |
dcd96379 | 1182 | ret = -EFAULT; |
07bd9686 TH |
1183 | |
1184 | tape->cur += todo; | |
1185 | tape->valid -= todo; | |
1186 | done += todo; | |
1da177e4 | 1187 | } |
07bd9686 | 1188 | |
49d8078a | 1189 | if (!done && test_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags)) { |
8004a8c9 BP |
1190 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1191 | ||
1da177e4 LT |
1192 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1193 | return 0; | |
1194 | } | |
dcd96379 | 1195 | |
07bd9686 | 1196 | return ret ? ret : done; |
1da177e4 LT |
1197 | } |
1198 | ||
5a04cfa9 | 1199 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1200 | size_t count, loff_t *ppos) |
1201 | { | |
5aeddf90 | 1202 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1203 | ide_drive_t *drive = tape->drive; |
07bd9686 | 1204 | size_t done = 0; |
dcd96379 | 1205 | ssize_t ret = 0; |
88f1b941 | 1206 | int rc; |
1da177e4 LT |
1207 | |
1208 | /* The drive is write protected. */ | |
1209 | if (tape->write_prot) | |
1210 | return -EACCES; | |
1211 | ||
8004a8c9 | 1212 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1213 | |
1214 | /* Initialize write operation */ | |
88f1b941 TH |
1215 | rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); |
1216 | if (rc < 0) | |
1217 | return rc; | |
07bd9686 TH |
1218 | |
1219 | while (done < count) { | |
1220 | size_t todo; | |
1221 | ||
1222 | /* flush if staging buffer is full */ | |
1223 | if (tape->valid == tape->buffer_size && | |
1224 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, | |
1225 | tape->buffer_size) <= 0) | |
1226 | return rc; | |
1227 | ||
1228 | /* copy in */ | |
1229 | todo = min_t(size_t, count - done, | |
1230 | tape->buffer_size - tape->valid); | |
1231 | if (copy_from_user(tape->cur, buf + done, todo)) | |
dcd96379 | 1232 | ret = -EFAULT; |
07bd9686 TH |
1233 | |
1234 | tape->cur += todo; | |
1235 | tape->valid += todo; | |
1236 | done += todo; | |
1da177e4 | 1237 | } |
07bd9686 TH |
1238 | |
1239 | return ret ? ret : done; | |
1da177e4 LT |
1240 | } |
1241 | ||
5a04cfa9 | 1242 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1243 | { |
2ac07d92 | 1244 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1245 | struct ide_atapi_pc pc; |
1da177e4 LT |
1246 | |
1247 | /* Write a filemark */ | |
1248 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
b13345f3 | 1249 | if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) { |
1da177e4 LT |
1250 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
1251 | return -EIO; | |
1252 | } | |
1253 | return 0; | |
1254 | } | |
1255 | ||
1256 | /* | |
d99c9da2 BP |
1257 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1258 | * requested. | |
1da177e4 | 1259 | * |
d99c9da2 BP |
1260 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1261 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1262 | * usually not supported. |
1da177e4 | 1263 | * |
d99c9da2 | 1264 | * The following commands are currently not supported: |
1da177e4 | 1265 | * |
d99c9da2 BP |
1266 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1267 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1268 | */ |
d99c9da2 | 1269 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1270 | { |
1271 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1272 | struct gendisk *disk = tape->disk; |
d236d74c | 1273 | struct ide_atapi_pc pc; |
5a04cfa9 | 1274 | int i, retval; |
1da177e4 | 1275 | |
8004a8c9 BP |
1276 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
1277 | mt_op, mt_count); | |
5a04cfa9 | 1278 | |
1da177e4 | 1279 | switch (mt_op) { |
5a04cfa9 BP |
1280 | case MTFSF: |
1281 | case MTFSFM: | |
1282 | case MTBSF: | |
1283 | case MTBSFM: | |
1284 | if (!mt_count) | |
1285 | return 0; | |
1286 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1287 | default: | |
1288 | break; | |
1da177e4 | 1289 | } |
5a04cfa9 | 1290 | |
1da177e4 | 1291 | switch (mt_op) { |
5a04cfa9 BP |
1292 | case MTWEOF: |
1293 | if (tape->write_prot) | |
1294 | return -EACCES; | |
ec0fdb01 | 1295 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1296 | for (i = 0; i < mt_count; i++) { |
1297 | retval = idetape_write_filemark(drive); | |
1298 | if (retval) | |
1299 | return retval; | |
1300 | } | |
1301 | return 0; | |
1302 | case MTREW: | |
ec0fdb01 | 1303 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1304 | if (idetape_rewind_tape(drive)) |
1305 | return -EIO; | |
1306 | return 0; | |
1307 | case MTLOAD: | |
ec0fdb01 | 1308 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1309 | return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1310 | case MTUNLOAD: |
1311 | case MTOFFL: | |
1312 | /* | |
1313 | * If door is locked, attempt to unlock before | |
1314 | * attempting to eject. | |
1315 | */ | |
1316 | if (tape->door_locked) { | |
0578042d | 1317 | if (!ide_set_media_lock(drive, disk, 0)) |
385a4b87 | 1318 | tape->door_locked = DOOR_UNLOCKED; |
5a04cfa9 | 1319 | } |
ec0fdb01 | 1320 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1321 | retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); |
5a04cfa9 | 1322 | if (!retval) |
49d8078a BP |
1323 | clear_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), |
1324 | &drive->atapi_flags); | |
5a04cfa9 BP |
1325 | return retval; |
1326 | case MTNOP: | |
ec0fdb01 | 1327 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1328 | return idetape_flush_tape_buffers(drive); |
1329 | case MTRETEN: | |
ec0fdb01 | 1330 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1331 | return ide_do_start_stop(drive, disk, |
5a04cfa9 | 1332 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1333 | case MTEOM: |
1334 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
b13345f3 | 1335 | return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
5a04cfa9 BP |
1336 | case MTERASE: |
1337 | (void)idetape_rewind_tape(drive); | |
1338 | idetape_create_erase_cmd(&pc); | |
b13345f3 | 1339 | return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
5a04cfa9 BP |
1340 | case MTSETBLK: |
1341 | if (mt_count) { | |
1342 | if (mt_count < tape->blk_size || | |
1343 | mt_count % tape->blk_size) | |
1da177e4 | 1344 | return -EIO; |
5a04cfa9 | 1345 | tape->user_bs_factor = mt_count / tape->blk_size; |
49d8078a BP |
1346 | clear_bit(ilog2(IDE_AFLAG_DETECT_BS), |
1347 | &drive->atapi_flags); | |
5a04cfa9 | 1348 | } else |
49d8078a BP |
1349 | set_bit(ilog2(IDE_AFLAG_DETECT_BS), |
1350 | &drive->atapi_flags); | |
5a04cfa9 BP |
1351 | return 0; |
1352 | case MTSEEK: | |
ec0fdb01 | 1353 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1354 | return idetape_position_tape(drive, |
1355 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1356 | case MTSETPART: | |
ec0fdb01 | 1357 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1358 | return idetape_position_tape(drive, 0, mt_count, 0); |
1359 | case MTFSR: | |
1360 | case MTBSR: | |
1361 | case MTLOCK: | |
0578042d | 1362 | retval = ide_set_media_lock(drive, disk, 1); |
5a04cfa9 | 1363 | if (retval) |
1da177e4 | 1364 | return retval; |
5a04cfa9 BP |
1365 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1366 | return 0; | |
1367 | case MTUNLOCK: | |
0578042d | 1368 | retval = ide_set_media_lock(drive, disk, 0); |
5a04cfa9 BP |
1369 | if (retval) |
1370 | return retval; | |
1371 | tape->door_locked = DOOR_UNLOCKED; | |
1372 | return 0; | |
1373 | default: | |
1374 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1375 | mt_op); | |
1376 | return -EIO; | |
1da177e4 LT |
1377 | } |
1378 | } | |
1379 | ||
1380 | /* | |
d99c9da2 BP |
1381 | * Our character device ioctls. General mtio.h magnetic io commands are |
1382 | * supported here, and not in the corresponding block interface. Our own | |
1383 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 1384 | */ |
d99c9da2 BP |
1385 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
1386 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1387 | { |
5aeddf90 | 1388 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 LT |
1389 | ide_drive_t *drive = tape->drive; |
1390 | struct mtop mtop; | |
1391 | struct mtget mtget; | |
1392 | struct mtpos mtpos; | |
54bb2074 | 1393 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
1394 | void __user *argp = (void __user *)arg; |
1395 | ||
8004a8c9 | 1396 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 1397 | |
54abf37e | 1398 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 1399 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1400 | idetape_flush_tape_buffers(drive); |
1401 | } | |
1402 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
963da55c | 1403 | block_offset = tape->valid / |
54bb2074 | 1404 | (tape->blk_size * tape->user_bs_factor); |
55ce3a12 | 1405 | position = ide_tape_read_position(drive); |
5a04cfa9 | 1406 | if (position < 0) |
1da177e4 LT |
1407 | return -EIO; |
1408 | } | |
1409 | switch (cmd) { | |
5a04cfa9 BP |
1410 | case MTIOCTOP: |
1411 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
1412 | return -EFAULT; | |
1413 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
1414 | case MTIOCGET: | |
1415 | memset(&mtget, 0, sizeof(struct mtget)); | |
1416 | mtget.mt_type = MT_ISSCSI2; | |
1417 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1418 | mtget.mt_dsreg = | |
1419 | ((tape->blk_size * tape->user_bs_factor) | |
1420 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
1421 | ||
1422 | if (tape->drv_write_prot) | |
1423 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
1424 | ||
1425 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
1426 | return -EFAULT; | |
1427 | return 0; | |
1428 | case MTIOCPOS: | |
1429 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1430 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
1431 | return -EFAULT; | |
1432 | return 0; | |
1433 | default: | |
1434 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1435 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 1436 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
1437 | } |
1438 | } | |
1439 | ||
3cffb9ce BP |
1440 | /* |
1441 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
1442 | * block size with the reported value. | |
1443 | */ | |
1444 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
1445 | { | |
1446 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1447 | struct ide_atapi_pc pc; |
837272b4 | 1448 | u8 buf[12]; |
3cffb9ce BP |
1449 | |
1450 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
837272b4 | 1451 | if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { |
3cffb9ce | 1452 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
54bb2074 | 1453 | if (tape->blk_size == 0) { |
3cffb9ce BP |
1454 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
1455 | "block size, assuming 32k\n"); | |
54bb2074 | 1456 | tape->blk_size = 32768; |
3cffb9ce BP |
1457 | } |
1458 | return; | |
1459 | } | |
837272b4 BP |
1460 | tape->blk_size = (buf[4 + 5] << 16) + |
1461 | (buf[4 + 6] << 8) + | |
1462 | buf[4 + 7]; | |
1463 | tape->drv_write_prot = (buf[2] & 0x80) >> 7; | |
3cffb9ce | 1464 | } |
1da177e4 | 1465 | |
5a04cfa9 | 1466 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
1467 | { |
1468 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
1469 | ide_drive_t *drive; | |
1470 | idetape_tape_t *tape; | |
1da177e4 LT |
1471 | int retval; |
1472 | ||
8004a8c9 BP |
1473 | if (i >= MAX_HWIFS * MAX_DRIVES) |
1474 | return -ENXIO; | |
1475 | ||
04f4ac9d | 1476 | lock_kernel(); |
9d01e4cd | 1477 | tape = ide_tape_get(NULL, true, i); |
04f4ac9d JC |
1478 | if (!tape) { |
1479 | unlock_kernel(); | |
8004a8c9 | 1480 | return -ENXIO; |
04f4ac9d | 1481 | } |
8004a8c9 BP |
1482 | |
1483 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1484 | ||
1da177e4 LT |
1485 | /* |
1486 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1487 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1488 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1489 | */ | |
1490 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1491 | ||
1da177e4 LT |
1492 | drive = tape->drive; |
1493 | ||
1494 | filp->private_data = tape; | |
1495 | ||
49d8078a | 1496 | if (test_and_set_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags)) { |
1da177e4 LT |
1497 | retval = -EBUSY; |
1498 | goto out_put_tape; | |
1499 | } | |
1500 | ||
1501 | retval = idetape_wait_ready(drive, 60 * HZ); | |
1502 | if (retval) { | |
49d8078a | 1503 | clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); |
1da177e4 LT |
1504 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
1505 | goto out_put_tape; | |
1506 | } | |
1507 | ||
79ca743f | 1508 | ide_tape_read_position(drive); |
49d8078a | 1509 | if (!test_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), &drive->atapi_flags)) |
1da177e4 LT |
1510 | (void)idetape_rewind_tape(drive); |
1511 | ||
1da177e4 | 1512 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 1513 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
1514 | |
1515 | /* Set write protect flag if device is opened as read-only. */ | |
1516 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
1517 | tape->write_prot = 1; | |
1518 | else | |
1519 | tape->write_prot = tape->drv_write_prot; | |
1520 | ||
1521 | /* Make sure drive isn't write protected if user wants to write. */ | |
1522 | if (tape->write_prot) { | |
1523 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
1524 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
49d8078a | 1525 | clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); |
1da177e4 LT |
1526 | retval = -EROFS; |
1527 | goto out_put_tape; | |
1528 | } | |
1529 | } | |
1530 | ||
3c98bf34 | 1531 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 1532 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
0578042d | 1533 | if (!ide_set_media_lock(drive, tape->disk, 1)) { |
385a4b87 BZ |
1534 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
1535 | tape->door_locked = DOOR_LOCKED; | |
1da177e4 LT |
1536 | } |
1537 | } | |
04f4ac9d | 1538 | unlock_kernel(); |
1da177e4 LT |
1539 | return 0; |
1540 | ||
1541 | out_put_tape: | |
1542 | ide_tape_put(tape); | |
04f4ac9d | 1543 | unlock_kernel(); |
1da177e4 LT |
1544 | return retval; |
1545 | } | |
1546 | ||
5a04cfa9 | 1547 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
1548 | { |
1549 | idetape_tape_t *tape = drive->driver_data; | |
1550 | ||
d9df937a | 1551 | ide_tape_flush_merge_buffer(drive); |
963da55c TH |
1552 | tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); |
1553 | if (tape->buf != NULL) { | |
54bb2074 BP |
1554 | idetape_pad_zeros(drive, tape->blk_size * |
1555 | (tape->user_bs_factor - 1)); | |
963da55c TH |
1556 | kfree(tape->buf); |
1557 | tape->buf = NULL; | |
1da177e4 LT |
1558 | } |
1559 | idetape_write_filemark(drive); | |
1560 | idetape_flush_tape_buffers(drive); | |
1561 | idetape_flush_tape_buffers(drive); | |
1562 | } | |
1563 | ||
5a04cfa9 | 1564 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 | 1565 | { |
5aeddf90 | 1566 | struct ide_tape_obj *tape = filp->private_data; |
1da177e4 | 1567 | ide_drive_t *drive = tape->drive; |
1da177e4 LT |
1568 | unsigned int minor = iminor(inode); |
1569 | ||
1570 | lock_kernel(); | |
1571 | tape = drive->driver_data; | |
8004a8c9 BP |
1572 | |
1573 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 1574 | |
54abf37e | 1575 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 1576 | idetape_write_release(drive, minor); |
54abf37e | 1577 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 1578 | if (minor < 128) |
ec0fdb01 | 1579 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 1580 | } |
f64eee7b | 1581 | |
49d8078a BP |
1582 | if (minor < 128 && test_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), |
1583 | &drive->atapi_flags)) | |
1da177e4 | 1584 | (void) idetape_rewind_tape(drive); |
49d8078a | 1585 | |
54abf37e | 1586 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 | 1587 | if (tape->door_locked == DOOR_LOCKED) { |
0578042d | 1588 | if (!ide_set_media_lock(drive, tape->disk, 0)) |
385a4b87 | 1589 | tape->door_locked = DOOR_UNLOCKED; |
1da177e4 LT |
1590 | } |
1591 | } | |
49d8078a | 1592 | clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); |
1da177e4 LT |
1593 | ide_tape_put(tape); |
1594 | unlock_kernel(); | |
1595 | return 0; | |
1596 | } | |
1597 | ||
6d29c8f0 | 1598 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 1599 | { |
1da177e4 | 1600 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 1601 | struct ide_atapi_pc pc; |
41fa9f86 | 1602 | u8 pc_buf[256]; |
801bd32e | 1603 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 1604 | |
1da177e4 | 1605 | idetape_create_inquiry_cmd(&pc); |
b13345f3 | 1606 | if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) { |
6d29c8f0 BP |
1607 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
1608 | tape->name); | |
1da177e4 LT |
1609 | return; |
1610 | } | |
b13345f3 BP |
1611 | memcpy(vendor_id, &pc_buf[8], 8); |
1612 | memcpy(product_id, &pc_buf[16], 16); | |
1613 | memcpy(fw_rev, &pc_buf[32], 4); | |
41f81d54 | 1614 | |
801bd32e BP |
1615 | ide_fixstring(vendor_id, 8, 0); |
1616 | ide_fixstring(product_id, 16, 0); | |
1617 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 1618 | |
801bd32e | 1619 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 1620 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
1621 | } |
1622 | ||
1623 | /* | |
b6422013 BP |
1624 | * Ask the tape about its various parameters. In particular, we will adjust our |
1625 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 1626 | */ |
5a04cfa9 | 1627 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
1628 | { |
1629 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1630 | struct ide_atapi_pc pc; |
b13345f3 | 1631 | u8 buf[24], *caps; |
b6422013 | 1632 | u8 speed, max_speed; |
47314fa4 | 1633 | |
1da177e4 | 1634 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
b13345f3 | 1635 | if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { |
b6422013 BP |
1636 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
1637 | " some default values\n"); | |
54bb2074 | 1638 | tape->blk_size = 512; |
b6422013 BP |
1639 | put_unaligned(52, (u16 *)&tape->caps[12]); |
1640 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
1641 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
1642 | return; |
1643 | } | |
b13345f3 | 1644 | caps = buf + 4 + buf[3]; |
b6422013 BP |
1645 | |
1646 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
1647 | speed = be16_to_cpup((__be16 *)&caps[14]); |
1648 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 1649 | |
cd740ab0 HH |
1650 | *(u16 *)&caps[8] = max_speed; |
1651 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
1652 | *(u16 *)&caps[14] = speed; | |
1653 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 1654 | |
b6422013 BP |
1655 | if (!speed) { |
1656 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
1657 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 1658 | *(u16 *)&caps[14] = 650; |
1da177e4 | 1659 | } |
b6422013 BP |
1660 | if (!max_speed) { |
1661 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
1662 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 1663 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
1664 | } |
1665 | ||
b6422013 | 1666 | memcpy(&tape->caps, caps, 20); |
0578042d BZ |
1667 | |
1668 | /* device lacks locking support according to capabilities page */ | |
1669 | if ((caps[6] & 1) == 0) | |
42619d35 | 1670 | drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; |
0578042d | 1671 | |
b6422013 | 1672 | if (caps[7] & 0x02) |
54bb2074 | 1673 | tape->blk_size = 512; |
b6422013 | 1674 | else if (caps[7] & 0x04) |
54bb2074 | 1675 | tape->blk_size = 1024; |
1da177e4 LT |
1676 | } |
1677 | ||
7662d046 | 1678 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
1679 | #define ide_tape_devset_get(name, field) \ |
1680 | static int get_##name(ide_drive_t *drive) \ | |
1681 | { \ | |
1682 | idetape_tape_t *tape = drive->driver_data; \ | |
1683 | return tape->field; \ | |
1684 | } | |
1685 | ||
1686 | #define ide_tape_devset_set(name, field) \ | |
1687 | static int set_##name(ide_drive_t *drive, int arg) \ | |
1688 | { \ | |
1689 | idetape_tape_t *tape = drive->driver_data; \ | |
1690 | tape->field = arg; \ | |
1691 | return 0; \ | |
1692 | } | |
1693 | ||
92f1f8fd | 1694 | #define ide_tape_devset_rw_field(_name, _field) \ |
8185d5aa BZ |
1695 | ide_tape_devset_get(_name, _field) \ |
1696 | ide_tape_devset_set(_name, _field) \ | |
92f1f8fd | 1697 | IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) |
8185d5aa | 1698 | |
92f1f8fd | 1699 | #define ide_tape_devset_r_field(_name, _field) \ |
8185d5aa | 1700 | ide_tape_devset_get(_name, _field) \ |
92f1f8fd | 1701 | IDE_DEVSET(_name, 0, get_##_name, NULL) |
8185d5aa BZ |
1702 | |
1703 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
1704 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
1705 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
1706 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
1707 | ||
97100fc8 | 1708 | ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); |
92f1f8fd EO |
1709 | |
1710 | ide_tape_devset_rw_field(debug_mask, debug_mask); | |
1711 | ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); | |
1712 | ||
1713 | ide_tape_devset_r_field(avg_speed, avg_speed); | |
1714 | ide_tape_devset_r_field(speed, caps[14]); | |
1715 | ide_tape_devset_r_field(buffer, caps[16]); | |
1716 | ide_tape_devset_r_field(buffer_size, buffer_size); | |
1717 | ||
1718 | static const struct ide_proc_devset idetape_settings[] = { | |
1719 | __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), | |
1720 | __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), | |
1721 | __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), | |
1722 | __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), | |
1723 | __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), | |
1724 | __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), | |
1725 | __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
1726 | mulf_tdsc, divf_tdsc), | |
71bfc7a7 | 1727 | { NULL }, |
8185d5aa | 1728 | }; |
7662d046 | 1729 | #endif |
1da177e4 LT |
1730 | |
1731 | /* | |
3c98bf34 | 1732 | * The function below is called to: |
1da177e4 | 1733 | * |
3c98bf34 BP |
1734 | * 1. Initialize our various state variables. |
1735 | * 2. Ask the tape for its capabilities. | |
1736 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
1737 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 1738 | * |
3c98bf34 BP |
1739 | * Note that at this point ide.c already assigned us an irq, so that we can |
1740 | * queue requests here and wait for their completion. | |
1da177e4 | 1741 | */ |
5a04cfa9 | 1742 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 1743 | { |
83042b24 | 1744 | unsigned long t; |
1da177e4 | 1745 | int speed; |
f73850a3 | 1746 | int buffer_size; |
b6422013 | 1747 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 1748 | |
85e39035 | 1749 | drive->pc_callback = ide_tape_callback; |
776bb027 | 1750 | |
97100fc8 BZ |
1751 | drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; |
1752 | ||
4166c199 BZ |
1753 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
1754 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
1755 | tape->name); | |
97100fc8 | 1756 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 1757 | } |
97100fc8 | 1758 | |
1da177e4 | 1759 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 1760 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
97100fc8 BZ |
1761 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1762 | ||
1da177e4 LT |
1763 | tape->minor = minor; |
1764 | tape->name[0] = 'h'; | |
1765 | tape->name[1] = 't'; | |
1766 | tape->name[2] = '0' + minor; | |
54abf37e | 1767 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
4dde4492 | 1768 | |
1da177e4 LT |
1769 | idetape_get_inquiry_results(drive); |
1770 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 1771 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 1772 | tape->user_bs_factor = 1; |
f73850a3 BP |
1773 | tape->buffer_size = *ctl * tape->blk_size; |
1774 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 1775 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 1776 | *ctl /= 2; |
f73850a3 | 1777 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 1778 | } |
f73850a3 | 1779 | buffer_size = tape->buffer_size; |
1da177e4 | 1780 | |
83042b24 | 1781 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 1782 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 1783 | |
f73850a3 | 1784 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
1785 | |
1786 | /* | |
3c98bf34 BP |
1787 | * Ensure that the number we got makes sense; limit it within |
1788 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 1789 | */ |
a792bd5a HH |
1790 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
1791 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 1792 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 1793 | "%lums tDSC%s\n", |
b6422013 | 1794 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
1795 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
1796 | tape->buffer_size / 1024, | |
54bb2074 | 1797 | tape->best_dsc_rw_freq * 1000 / HZ, |
97100fc8 | 1798 | (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); |
1da177e4 | 1799 | |
1e874f44 | 1800 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
1801 | } |
1802 | ||
4031bbe4 | 1803 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
1804 | { |
1805 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1806 | |
7662d046 | 1807 | ide_proc_unregister_driver(drive, tape->driver); |
8fed4368 | 1808 | device_del(&tape->dev); |
1da177e4 LT |
1809 | ide_unregister_region(tape->disk); |
1810 | ||
8fed4368 BZ |
1811 | mutex_lock(&idetape_ref_mutex); |
1812 | put_device(&tape->dev); | |
1813 | mutex_unlock(&idetape_ref_mutex); | |
1da177e4 LT |
1814 | } |
1815 | ||
8fed4368 | 1816 | static void ide_tape_release(struct device *dev) |
1da177e4 | 1817 | { |
8fed4368 | 1818 | struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); |
1da177e4 LT |
1819 | ide_drive_t *drive = tape->drive; |
1820 | struct gendisk *g = tape->disk; | |
1821 | ||
963da55c | 1822 | BUG_ON(tape->valid); |
8604affd | 1823 | |
97100fc8 | 1824 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 1825 | drive->driver_data = NULL; |
dbc1272e | 1826 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
1827 | device_destroy(idetape_sysfs_class, |
1828 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
1829 | idetape_devs[tape->minor] = NULL; |
1830 | g->private_data = NULL; | |
1831 | put_disk(g); | |
1832 | kfree(tape); | |
1833 | } | |
1834 | ||
ecfd80e4 | 1835 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
1836 | static int proc_idetape_read_name |
1837 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
1838 | { | |
1839 | ide_drive_t *drive = (ide_drive_t *) data; | |
1840 | idetape_tape_t *tape = drive->driver_data; | |
1841 | char *out = page; | |
1842 | int len; | |
1843 | ||
1844 | len = sprintf(out, "%s\n", tape->name); | |
1845 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
1846 | } | |
1847 | ||
1848 | static ide_proc_entry_t idetape_proc[] = { | |
1849 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
1850 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
1851 | { NULL, 0, NULL, NULL } | |
1852 | }; | |
79cb3803 BZ |
1853 | |
1854 | static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) | |
1855 | { | |
1856 | return idetape_proc; | |
1857 | } | |
1858 | ||
1859 | static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) | |
1860 | { | |
1861 | return idetape_settings; | |
1862 | } | |
1da177e4 LT |
1863 | #endif |
1864 | ||
4031bbe4 | 1865 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 1866 | |
7f3c868b | 1867 | static struct ide_driver idetape_driver = { |
8604affd | 1868 | .gen_driver = { |
4ef3b8f4 | 1869 | .owner = THIS_MODULE, |
8604affd BZ |
1870 | .name = "ide-tape", |
1871 | .bus = &ide_bus_type, | |
8604affd | 1872 | }, |
4031bbe4 RK |
1873 | .probe = ide_tape_probe, |
1874 | .remove = ide_tape_remove, | |
1da177e4 | 1875 | .version = IDETAPE_VERSION, |
1da177e4 | 1876 | .do_request = idetape_do_request, |
7662d046 | 1877 | #ifdef CONFIG_IDE_PROC_FS |
79cb3803 BZ |
1878 | .proc_entries = ide_tape_proc_entries, |
1879 | .proc_devsets = ide_tape_proc_devsets, | |
7662d046 | 1880 | #endif |
1da177e4 LT |
1881 | }; |
1882 | ||
3c98bf34 | 1883 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 1884 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
1885 | .owner = THIS_MODULE, |
1886 | .read = idetape_chrdev_read, | |
1887 | .write = idetape_chrdev_write, | |
1888 | .ioctl = idetape_chrdev_ioctl, | |
1889 | .open = idetape_chrdev_open, | |
1890 | .release = idetape_chrdev_release, | |
1891 | }; | |
1892 | ||
a4600f81 | 1893 | static int idetape_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 1894 | { |
9d01e4cd | 1895 | struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk, false, 0); |
1da177e4 | 1896 | |
5a04cfa9 | 1897 | if (!tape) |
1da177e4 LT |
1898 | return -ENXIO; |
1899 | ||
1da177e4 LT |
1900 | return 0; |
1901 | } | |
1902 | ||
a4600f81 | 1903 | static int idetape_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 1904 | { |
5aeddf90 | 1905 | struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); |
1da177e4 LT |
1906 | |
1907 | ide_tape_put(tape); | |
1da177e4 LT |
1908 | return 0; |
1909 | } | |
1910 | ||
a4600f81 | 1911 | static int idetape_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
1912 | unsigned int cmd, unsigned long arg) |
1913 | { | |
5aeddf90 | 1914 | struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); |
1da177e4 | 1915 | ide_drive_t *drive = tape->drive; |
1bddd9e6 | 1916 | int err = generic_ide_ioctl(drive, bdev, cmd, arg); |
1da177e4 LT |
1917 | if (err == -EINVAL) |
1918 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
1919 | return err; | |
1920 | } | |
1921 | ||
1922 | static struct block_device_operations idetape_block_ops = { | |
1923 | .owner = THIS_MODULE, | |
a4600f81 AV |
1924 | .open = idetape_open, |
1925 | .release = idetape_release, | |
1926 | .locked_ioctl = idetape_ioctl, | |
1da177e4 LT |
1927 | }; |
1928 | ||
4031bbe4 | 1929 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
1930 | { |
1931 | idetape_tape_t *tape; | |
1932 | struct gendisk *g; | |
1933 | int minor; | |
1934 | ||
1935 | if (!strstr("ide-tape", drive->driver_req)) | |
1936 | goto failed; | |
2a924662 | 1937 | |
1da177e4 LT |
1938 | if (drive->media != ide_tape) |
1939 | goto failed; | |
2a924662 | 1940 | |
97100fc8 BZ |
1941 | if ((drive->dev_flags & IDE_DFLAG_ID_READ) && |
1942 | ide_check_atapi_device(drive, DRV_NAME) == 0) { | |
5a04cfa9 BP |
1943 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
1944 | " the driver\n", drive->name); | |
1da177e4 LT |
1945 | goto failed; |
1946 | } | |
5a04cfa9 | 1947 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 1948 | if (tape == NULL) { |
5a04cfa9 BP |
1949 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
1950 | drive->name); | |
1da177e4 LT |
1951 | goto failed; |
1952 | } | |
1953 | ||
1954 | g = alloc_disk(1 << PARTN_BITS); | |
1955 | if (!g) | |
1956 | goto out_free_tape; | |
1957 | ||
1958 | ide_init_disk(g, drive); | |
1959 | ||
8fed4368 BZ |
1960 | tape->dev.parent = &drive->gendev; |
1961 | tape->dev.release = ide_tape_release; | |
1962 | dev_set_name(&tape->dev, dev_name(&drive->gendev)); | |
1963 | ||
1964 | if (device_register(&tape->dev)) | |
1965 | goto out_free_disk; | |
1da177e4 LT |
1966 | |
1967 | tape->drive = drive; | |
1968 | tape->driver = &idetape_driver; | |
1969 | tape->disk = g; | |
1970 | ||
1971 | g->private_data = &tape->driver; | |
1972 | ||
1973 | drive->driver_data = tape; | |
1974 | ||
cf8b8975 | 1975 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
1976 | for (minor = 0; idetape_devs[minor]; minor++) |
1977 | ; | |
1978 | idetape_devs[minor] = tape; | |
cf8b8975 | 1979 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
1980 | |
1981 | idetape_setup(drive, tape, minor); | |
1982 | ||
3ee074bf GKH |
1983 | device_create(idetape_sysfs_class, &drive->gendev, |
1984 | MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); | |
1985 | device_create(idetape_sysfs_class, &drive->gendev, | |
1986 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
1987 | "n%s", tape->name); | |
d5dee80a | 1988 | |
1da177e4 LT |
1989 | g->fops = &idetape_block_ops; |
1990 | ide_register_region(g); | |
1991 | ||
1992 | return 0; | |
8604affd | 1993 | |
8fed4368 BZ |
1994 | out_free_disk: |
1995 | put_disk(g); | |
1da177e4 LT |
1996 | out_free_tape: |
1997 | kfree(tape); | |
1998 | failed: | |
8604affd | 1999 | return -ENODEV; |
1da177e4 LT |
2000 | } |
2001 | ||
5a04cfa9 | 2002 | static void __exit idetape_exit(void) |
1da177e4 | 2003 | { |
8604affd | 2004 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2005 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2006 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2007 | } | |
2008 | ||
17514e8a | 2009 | static int __init idetape_init(void) |
1da177e4 | 2010 | { |
d5dee80a WD |
2011 | int error = 1; |
2012 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2013 | if (IS_ERR(idetape_sysfs_class)) { | |
2014 | idetape_sysfs_class = NULL; | |
2015 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2016 | error = -EBUSY; | |
2017 | goto out; | |
2018 | } | |
2019 | ||
1da177e4 | 2020 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2021 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2022 | " interface\n"); | |
d5dee80a WD |
2023 | error = -EBUSY; |
2024 | goto out_free_class; | |
1da177e4 | 2025 | } |
d5dee80a WD |
2026 | |
2027 | error = driver_register(&idetape_driver.gen_driver); | |
2028 | if (error) | |
2029 | goto out_free_driver; | |
2030 | ||
2031 | return 0; | |
2032 | ||
2033 | out_free_driver: | |
2034 | driver_unregister(&idetape_driver.gen_driver); | |
2035 | out_free_class: | |
2036 | class_destroy(idetape_sysfs_class); | |
2037 | out: | |
2038 | return error; | |
1da177e4 LT |
2039 | } |
2040 | ||
263756ec | 2041 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2042 | module_init(idetape_init); |
2043 | module_exit(idetape_exit); | |
2044 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2045 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2046 | MODULE_LICENSE("GPL"); |