Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
5ce78af4 BP |
2 | * IDE ATAPI streaming tape driver. |
3 | * | |
59bca8cc BZ |
4 | * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> |
5 | * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz | |
1da177e4 | 6 | * |
1da177e4 LT |
7 | * This driver was constructed as a student project in the software laboratory |
8 | * of the faculty of electrical engineering in the Technion - Israel's | |
9 | * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. | |
10 | * | |
11 | * It is hereby placed under the terms of the GNU general public license. | |
12 | * (See linux/COPYING). | |
1da177e4 | 13 | * |
5ce78af4 BP |
14 | * For a historical changelog see |
15 | * Documentation/ide/ChangeLog.ide-tape.1995-2002 | |
1da177e4 LT |
16 | */ |
17 | ||
51509eec BZ |
18 | #define DRV_NAME "ide-tape" |
19 | ||
dfe79936 | 20 | #define IDETAPE_VERSION "1.20" |
1da177e4 | 21 | |
1da177e4 LT |
22 | #include <linux/module.h> |
23 | #include <linux/types.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/timer.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/interrupt.h> | |
9bae1ff3 | 30 | #include <linux/jiffies.h> |
1da177e4 | 31 | #include <linux/major.h> |
1da177e4 LT |
32 | #include <linux/errno.h> |
33 | #include <linux/genhd.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/pci.h> | |
36 | #include <linux/ide.h> | |
37 | #include <linux/smp_lock.h> | |
38 | #include <linux/completion.h> | |
39 | #include <linux/bitops.h> | |
cf8b8975 | 40 | #include <linux/mutex.h> |
90699ce2 | 41 | #include <scsi/scsi.h> |
1da177e4 LT |
42 | |
43 | #include <asm/byteorder.h> | |
c837cfa5 BP |
44 | #include <linux/irq.h> |
45 | #include <linux/uaccess.h> | |
46 | #include <linux/io.h> | |
1da177e4 | 47 | #include <asm/unaligned.h> |
1da177e4 LT |
48 | #include <linux/mtio.h> |
49 | ||
8004a8c9 BP |
50 | enum { |
51 | /* output errors only */ | |
52 | DBG_ERR = (1 << 0), | |
53 | /* output all sense key/asc */ | |
54 | DBG_SENSE = (1 << 1), | |
55 | /* info regarding all chrdev-related procedures */ | |
56 | DBG_CHRDEV = (1 << 2), | |
57 | /* all remaining procedures */ | |
58 | DBG_PROCS = (1 << 3), | |
8004a8c9 BP |
59 | }; |
60 | ||
61 | /* define to see debug info */ | |
62 | #define IDETAPE_DEBUG_LOG 0 | |
63 | ||
64 | #if IDETAPE_DEBUG_LOG | |
65 | #define debug_log(lvl, fmt, args...) \ | |
66 | { \ | |
67 | if (tape->debug_mask & lvl) \ | |
68 | printk(KERN_INFO "ide-tape: " fmt, ## args); \ | |
69 | } | |
70 | #else | |
71 | #define debug_log(lvl, fmt, args...) do {} while (0) | |
72 | #endif | |
73 | ||
1da177e4 | 74 | /**************************** Tunable parameters *****************************/ |
1da177e4 | 75 | /* |
3c98bf34 BP |
76 | * After each failed packet command we issue a request sense command and retry |
77 | * the packet command IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 78 | * |
3c98bf34 | 79 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
1da177e4 LT |
80 | */ |
81 | #define IDETAPE_MAX_PC_RETRIES 3 | |
82 | ||
1da177e4 | 83 | /* |
3c98bf34 BP |
84 | * The following parameter is used to select the point in the internal tape fifo |
85 | * in which we will start to refill the buffer. Decreasing the following | |
86 | * parameter will improve the system's latency and interactive response, while | |
87 | * using a high value might improve system throughput. | |
1da177e4 | 88 | */ |
3c98bf34 | 89 | #define IDETAPE_FIFO_THRESHOLD 2 |
1da177e4 LT |
90 | |
91 | /* | |
3c98bf34 | 92 | * DSC polling parameters. |
1da177e4 | 93 | * |
3c98bf34 BP |
94 | * Polling for DSC (a single bit in the status register) is a very important |
95 | * function in ide-tape. There are two cases in which we poll for DSC: | |
1da177e4 | 96 | * |
3c98bf34 BP |
97 | * 1. Before a read/write packet command, to ensure that we can transfer data |
98 | * from/to the tape's data buffers, without causing an actual media access. | |
99 | * In case the tape is not ready yet, we take out our request from the device | |
100 | * request queue, so that ide.c could service requests from the other device | |
101 | * on the same interface in the meantime. | |
1da177e4 | 102 | * |
3c98bf34 BP |
103 | * 2. After the successful initialization of a "media access packet command", |
104 | * which is a command that can take a long time to complete (the interval can | |
105 | * range from several seconds to even an hour). Again, we postpone our request | |
106 | * in the middle to free the bus for the other device. The polling frequency | |
107 | * here should be lower than the read/write frequency since those media access | |
108 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST | |
109 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD | |
110 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). | |
1da177e4 | 111 | * |
3c98bf34 BP |
112 | * We also set a timeout for the timer, in case something goes wrong. The |
113 | * timeout should be longer then the maximum execution time of a tape operation. | |
1da177e4 | 114 | */ |
3c98bf34 BP |
115 | |
116 | /* DSC timings. */ | |
1da177e4 LT |
117 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
118 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ | |
119 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ | |
120 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ | |
121 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ | |
122 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ | |
123 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ | |
124 | ||
125 | /*************************** End of tunable parameters ***********************/ | |
126 | ||
54abf37e BP |
127 | /* tape directions */ |
128 | enum { | |
129 | IDETAPE_DIR_NONE = (1 << 0), | |
130 | IDETAPE_DIR_READ = (1 << 1), | |
131 | IDETAPE_DIR_WRITE = (1 << 2), | |
132 | }; | |
1da177e4 LT |
133 | |
134 | struct idetape_bh { | |
ab057968 | 135 | u32 b_size; |
1da177e4 LT |
136 | atomic_t b_count; |
137 | struct idetape_bh *b_reqnext; | |
138 | char *b_data; | |
139 | }; | |
140 | ||
03056b90 BP |
141 | /* Tape door status */ |
142 | #define DOOR_UNLOCKED 0 | |
143 | #define DOOR_LOCKED 1 | |
144 | #define DOOR_EXPLICITLY_LOCKED 2 | |
145 | ||
146 | /* Some defines for the SPACE command */ | |
147 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
148 | #define IDETAPE_SPACE_TO_EOD 3 | |
149 | ||
150 | /* Some defines for the LOAD UNLOAD command */ | |
151 | #define IDETAPE_LU_LOAD_MASK 1 | |
152 | #define IDETAPE_LU_RETENSION_MASK 2 | |
153 | #define IDETAPE_LU_EOT_MASK 4 | |
154 | ||
03056b90 BP |
155 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ |
156 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
157 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
158 | ||
1da177e4 | 159 | /* |
3c98bf34 BP |
160 | * Most of our global data which we need to save even as we leave the driver due |
161 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
162 | */ |
163 | typedef struct ide_tape_obj { | |
7f3c868b BZ |
164 | ide_drive_t *drive; |
165 | struct ide_driver *driver; | |
166 | struct gendisk *disk; | |
8fed4368 | 167 | struct device dev; |
1da177e4 | 168 | |
2e8a6f89 BZ |
169 | /* used by REQ_IDETAPE_{READ,WRITE} requests */ |
170 | struct ide_atapi_pc queued_pc; | |
394a4c21 | 171 | |
1da177e4 | 172 | /* |
3c98bf34 | 173 | * DSC polling variables. |
1da177e4 | 174 | * |
3c98bf34 BP |
175 | * While polling for DSC we use postponed_rq to postpone the current |
176 | * request so that ide.c will be able to service pending requests on the | |
177 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 178 | * data transfer) request in the device request queue. |
1da177e4 LT |
179 | */ |
180 | struct request *postponed_rq; | |
181 | /* The time in which we started polling for DSC */ | |
182 | unsigned long dsc_polling_start; | |
183 | /* Timer used to poll for dsc */ | |
184 | struct timer_list dsc_timer; | |
185 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
186 | unsigned long best_dsc_rw_freq; |
187 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
188 | unsigned long dsc_timeout; |
189 | ||
3c98bf34 | 190 | /* Read position information */ |
1da177e4 LT |
191 | u8 partition; |
192 | /* Current block */ | |
54bb2074 | 193 | unsigned int first_frame; |
1da177e4 | 194 | |
3c98bf34 | 195 | /* Last error information */ |
1da177e4 LT |
196 | u8 sense_key, asc, ascq; |
197 | ||
3c98bf34 | 198 | /* Character device operation */ |
1da177e4 LT |
199 | unsigned int minor; |
200 | /* device name */ | |
201 | char name[4]; | |
202 | /* Current character device data transfer direction */ | |
54abf37e | 203 | u8 chrdev_dir; |
1da177e4 | 204 | |
54bb2074 BP |
205 | /* tape block size, usually 512 or 1024 bytes */ |
206 | unsigned short blk_size; | |
1da177e4 | 207 | int user_bs_factor; |
b6422013 | 208 | |
1da177e4 | 209 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 210 | u8 caps[20]; |
1da177e4 LT |
211 | |
212 | /* | |
3c98bf34 | 213 | * Active data transfer request parameters. |
1da177e4 | 214 | * |
3c98bf34 BP |
215 | * At most, there is only one ide-tape originated data transfer request |
216 | * in the device request queue. This allows ide.c to easily service | |
217 | * requests from the other device when we postpone our active request. | |
1da177e4 | 218 | */ |
83042b24 | 219 | |
3c98bf34 | 220 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 221 | int buffer_size; |
077e3bdb BP |
222 | /* merge buffer */ |
223 | struct idetape_bh *merge_bh; | |
01a63aeb BP |
224 | /* size of the merge buffer */ |
225 | int merge_bh_size; | |
077e3bdb | 226 | /* pointer to current buffer head within the merge buffer */ |
1da177e4 LT |
227 | struct idetape_bh *bh; |
228 | char *b_data; | |
229 | int b_count; | |
3c98bf34 | 230 | |
a997a435 | 231 | int pages_per_buffer; |
1da177e4 LT |
232 | /* Wasted space in each stage */ |
233 | int excess_bh_size; | |
234 | ||
3c98bf34 | 235 | /* Measures average tape speed */ |
1da177e4 LT |
236 | unsigned long avg_time; |
237 | int avg_size; | |
238 | int avg_speed; | |
239 | ||
1da177e4 LT |
240 | /* the door is currently locked */ |
241 | int door_locked; | |
242 | /* the tape hardware is write protected */ | |
243 | char drv_write_prot; | |
244 | /* the tape is write protected (hardware or opened as read-only) */ | |
245 | char write_prot; | |
246 | ||
8004a8c9 | 247 | u32 debug_mask; |
1da177e4 LT |
248 | } idetape_tape_t; |
249 | ||
cf8b8975 | 250 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 251 | |
d5dee80a WD |
252 | static struct class *idetape_sysfs_class; |
253 | ||
8fed4368 | 254 | static void ide_tape_release(struct device *); |
08da591e | 255 | |
1da177e4 LT |
256 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
257 | { | |
258 | struct ide_tape_obj *tape = NULL; | |
259 | ||
cf8b8975 | 260 | mutex_lock(&idetape_ref_mutex); |
5aeddf90 | 261 | tape = ide_drv_g(disk, ide_tape_obj); |
08da591e | 262 | if (tape) { |
d3e33ff5 | 263 | if (ide_device_get(tape->drive)) |
08da591e | 264 | tape = NULL; |
d3e33ff5 | 265 | else |
8fed4368 | 266 | get_device(&tape->dev); |
08da591e | 267 | } |
cf8b8975 | 268 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
269 | return tape; |
270 | } | |
271 | ||
1da177e4 LT |
272 | static void ide_tape_put(struct ide_tape_obj *tape) |
273 | { | |
d3e33ff5 BZ |
274 | ide_drive_t *drive = tape->drive; |
275 | ||
cf8b8975 | 276 | mutex_lock(&idetape_ref_mutex); |
8fed4368 | 277 | put_device(&tape->dev); |
d3e33ff5 | 278 | ide_device_put(drive); |
cf8b8975 | 279 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
280 | } |
281 | ||
1da177e4 | 282 | /* |
3c98bf34 BP |
283 | * The variables below are used for the character device interface. Additional |
284 | * state variables are defined in our ide_drive_t structure. | |
1da177e4 | 285 | */ |
5a04cfa9 | 286 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
1da177e4 | 287 | |
1da177e4 LT |
288 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) |
289 | { | |
290 | struct ide_tape_obj *tape = NULL; | |
291 | ||
cf8b8975 | 292 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
293 | tape = idetape_devs[i]; |
294 | if (tape) | |
8fed4368 | 295 | get_device(&tape->dev); |
cf8b8975 | 296 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
297 | return tape; |
298 | } | |
299 | ||
d93bc452 | 300 | static int idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 301 | unsigned int bcount) |
1da177e4 LT |
302 | { |
303 | struct idetape_bh *bh = pc->bh; | |
304 | int count; | |
305 | ||
306 | while (bcount) { | |
d93bc452 BZ |
307 | if (bh == NULL) |
308 | break; | |
5a04cfa9 BP |
309 | count = min( |
310 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
311 | bcount); | |
374e042c | 312 | drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data + |
5a04cfa9 | 313 | atomic_read(&bh->b_count), count); |
1da177e4 LT |
314 | bcount -= count; |
315 | atomic_add(count, &bh->b_count); | |
316 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
317 | bh = bh->b_reqnext; | |
318 | if (bh) | |
319 | atomic_set(&bh->b_count, 0); | |
320 | } | |
321 | } | |
d93bc452 | 322 | |
1da177e4 | 323 | pc->bh = bh; |
d93bc452 BZ |
324 | |
325 | return bcount; | |
1da177e4 LT |
326 | } |
327 | ||
d93bc452 | 328 | static int idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 329 | unsigned int bcount) |
1da177e4 LT |
330 | { |
331 | struct idetape_bh *bh = pc->bh; | |
332 | int count; | |
333 | ||
334 | while (bcount) { | |
d93bc452 BZ |
335 | if (bh == NULL) |
336 | break; | |
1da177e4 | 337 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
374e042c | 338 | drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); |
1da177e4 LT |
339 | bcount -= count; |
340 | pc->b_data += count; | |
341 | pc->b_count -= count; | |
342 | if (!pc->b_count) { | |
5a04cfa9 BP |
343 | bh = bh->b_reqnext; |
344 | pc->bh = bh; | |
1da177e4 LT |
345 | if (bh) { |
346 | pc->b_data = bh->b_data; | |
347 | pc->b_count = atomic_read(&bh->b_count); | |
348 | } | |
349 | } | |
350 | } | |
d93bc452 BZ |
351 | |
352 | return bcount; | |
1da177e4 LT |
353 | } |
354 | ||
646c0cb6 | 355 | static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
356 | { |
357 | struct idetape_bh *bh = pc->bh; | |
358 | int count; | |
d236d74c | 359 | unsigned int bcount = pc->xferred; |
1da177e4 | 360 | |
346331f8 | 361 | if (pc->flags & PC_FLAG_WRITING) |
1da177e4 LT |
362 | return; |
363 | while (bcount) { | |
1da177e4 | 364 | if (bh == NULL) { |
5a04cfa9 BP |
365 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
366 | __func__); | |
1da177e4 LT |
367 | return; |
368 | } | |
1da177e4 LT |
369 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
370 | atomic_set(&bh->b_count, count); | |
371 | if (atomic_read(&bh->b_count) == bh->b_size) | |
372 | bh = bh->b_reqnext; | |
373 | bcount -= count; | |
374 | } | |
375 | pc->bh = bh; | |
376 | } | |
377 | ||
1da177e4 | 378 | /* |
1b5db434 BP |
379 | * called on each failed packet command retry to analyze the request sense. We |
380 | * currently do not utilize this information. | |
1da177e4 | 381 | */ |
1b5db434 | 382 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
383 | { |
384 | idetape_tape_t *tape = drive->driver_data; | |
5e2040fd | 385 | struct ide_atapi_pc *pc = drive->failed_pc; |
1da177e4 | 386 | |
1b5db434 BP |
387 | tape->sense_key = sense[2] & 0xF; |
388 | tape->asc = sense[12]; | |
389 | tape->ascq = sense[13]; | |
8004a8c9 BP |
390 | |
391 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
392 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 393 | |
d236d74c | 394 | /* Correct pc->xferred by asking the tape. */ |
346331f8 | 395 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
d236d74c | 396 | pc->xferred = pc->req_xfer - |
54bb2074 | 397 | tape->blk_size * |
5d0cc8ae | 398 | get_unaligned_be32(&sense[3]); |
646c0cb6 | 399 | idetape_update_buffers(drive, pc); |
1da177e4 LT |
400 | } |
401 | ||
402 | /* | |
403 | * If error was the result of a zero-length read or write command, | |
404 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
405 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
406 | */ | |
90699ce2 | 407 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
408 | /* length == 0 */ |
409 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
410 | if (tape->sense_key == 5) { | |
1da177e4 LT |
411 | /* don't report an error, everything's ok */ |
412 | pc->error = 0; | |
413 | /* don't retry read/write */ | |
346331f8 | 414 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
415 | } |
416 | } | |
90699ce2 | 417 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
c152cc1a | 418 | pc->error = IDE_DRV_ERROR_FILEMARK; |
346331f8 | 419 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 420 | } |
90699ce2 | 421 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
422 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
423 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
c152cc1a | 424 | pc->error = IDE_DRV_ERROR_EOD; |
346331f8 | 425 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
426 | } |
427 | } | |
90699ce2 | 428 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 429 | if (tape->sense_key == 8) { |
c152cc1a | 430 | pc->error = IDE_DRV_ERROR_EOD; |
346331f8 | 431 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 432 | } |
346331f8 | 433 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 434 | pc->xferred) |
1da177e4 LT |
435 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
436 | } | |
437 | } | |
438 | ||
d01dbc3b | 439 | /* Free data buffers completely. */ |
077e3bdb | 440 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) |
1da177e4 | 441 | { |
077e3bdb | 442 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; |
d01dbc3b BP |
443 | |
444 | while (bh) { | |
445 | u32 size = bh->b_size; | |
446 | ||
447 | while (size) { | |
448 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
449 | ||
450 | if (bh->b_data) | |
451 | free_pages((unsigned long)bh->b_data, order); | |
452 | ||
453 | size &= (order-1); | |
454 | bh->b_data += (1 << order) * PAGE_SIZE; | |
1da177e4 LT |
455 | } |
456 | prev_bh = bh; | |
457 | bh = bh->b_reqnext; | |
458 | kfree(prev_bh); | |
459 | } | |
1da177e4 LT |
460 | } |
461 | ||
b14c7212 BZ |
462 | static void ide_tape_handle_dsc(ide_drive_t *); |
463 | ||
03a2faae | 464 | static int ide_tape_callback(ide_drive_t *drive, int dsc) |
1da177e4 LT |
465 | { |
466 | idetape_tape_t *tape = drive->driver_data; | |
2b9efba4 | 467 | struct ide_atapi_pc *pc = drive->pc; |
313afea7 | 468 | struct request *rq = drive->hwif->rq; |
5985e6ab | 469 | int uptodate = pc->error ? 0 : 1; |
313afea7 | 470 | int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; |
1da177e4 | 471 | |
8004a8c9 BP |
472 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
473 | ||
b14c7212 BZ |
474 | if (dsc) |
475 | ide_tape_handle_dsc(drive); | |
476 | ||
5e2040fd BZ |
477 | if (drive->failed_pc == pc) |
478 | drive->failed_pc = NULL; | |
dd2e9a03 | 479 | |
5985e6ab BZ |
480 | if (pc->c[0] == REQUEST_SENSE) { |
481 | if (uptodate) | |
482 | idetape_analyze_error(drive, pc->buf); | |
483 | else | |
484 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
485 | "itself - Aborting request!\n"); | |
486 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
5985e6ab BZ |
487 | int blocks = pc->xferred / tape->blk_size; |
488 | ||
489 | tape->avg_size += blocks * tape->blk_size; | |
490 | ||
491 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
492 | tape->avg_speed = tape->avg_size * HZ / | |
493 | (jiffies - tape->avg_time) / 1024; | |
494 | tape->avg_size = 0; | |
495 | tape->avg_time = jiffies; | |
496 | } | |
497 | ||
498 | tape->first_frame += blocks; | |
499 | rq->current_nr_sectors -= blocks; | |
500 | ||
313afea7 BZ |
501 | if (pc->error) { |
502 | uptodate = 0; | |
503 | err = pc->error; | |
504 | } | |
5985e6ab | 505 | } else if (pc->c[0] == READ_POSITION && uptodate) { |
2b9efba4 | 506 | u8 *readpos = pc->buf; |
5985e6ab BZ |
507 | |
508 | debug_log(DBG_SENSE, "BOP - %s\n", | |
509 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
510 | debug_log(DBG_SENSE, "EOP - %s\n", | |
511 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
512 | ||
513 | if (readpos[0] & 0x4) { | |
514 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
515 | "to the tape\n"); | |
f2e3ab52 | 516 | clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 517 | uptodate = 0; |
313afea7 | 518 | err = IDE_DRV_ERROR_GENERAL; |
5985e6ab BZ |
519 | } else { |
520 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
cd740ab0 | 521 | be32_to_cpup((__be32 *)&readpos[4])); |
5985e6ab BZ |
522 | |
523 | tape->partition = readpos[1]; | |
cd740ab0 | 524 | tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); |
f2e3ab52 | 525 | set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 526 | } |
1da177e4 | 527 | } |
5985e6ab | 528 | |
313afea7 BZ |
529 | rq->errors = err; |
530 | ||
03a2faae | 531 | return uptodate; |
1da177e4 LT |
532 | } |
533 | ||
1da177e4 | 534 | /* |
3c98bf34 | 535 | * Postpone the current request so that ide.c will be able to service requests |
b65fac32 | 536 | * from another device on the same port while we are polling for DSC. |
1da177e4 | 537 | */ |
5a04cfa9 | 538 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
539 | { |
540 | idetape_tape_t *tape = drive->driver_data; | |
541 | ||
8004a8c9 BP |
542 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
543 | ||
b65fac32 BZ |
544 | tape->postponed_rq = drive->hwif->rq; |
545 | ||
54bb2074 | 546 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
547 | } |
548 | ||
74e63e74 BZ |
549 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
550 | { | |
551 | idetape_tape_t *tape = drive->driver_data; | |
552 | ||
553 | /* Media access command */ | |
554 | tape->dsc_polling_start = jiffies; | |
555 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
556 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
557 | /* Allow ide.c to handle other requests */ | |
558 | idetape_postpone_request(drive); | |
559 | } | |
560 | ||
acaa0f5f | 561 | static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
08424ac2 BZ |
562 | unsigned int bcount, int write) |
563 | { | |
d93bc452 BZ |
564 | unsigned int bleft; |
565 | ||
08424ac2 | 566 | if (write) |
d93bc452 | 567 | bleft = idetape_output_buffers(drive, pc, bcount); |
08424ac2 | 568 | else |
d93bc452 | 569 | bleft = idetape_input_buffers(drive, pc, bcount); |
acaa0f5f | 570 | |
d93bc452 | 571 | return bcount - bleft; |
08424ac2 | 572 | } |
a1efc85f | 573 | |
1da177e4 | 574 | /* |
3c98bf34 | 575 | * Packet Command Interface |
1da177e4 | 576 | * |
2b9efba4 | 577 | * The current Packet Command is available in drive->pc, and will not change |
3c98bf34 BP |
578 | * until we finish handling it. Each packet command is associated with a |
579 | * callback function that will be called when the command is finished. | |
1da177e4 | 580 | * |
3c98bf34 | 581 | * The handling will be done in three stages: |
1da177e4 | 582 | * |
b788ee9c | 583 | * 1. ide_tape_issue_pc will send the packet command to the drive, and will set |
aa5d2de7 | 584 | * the interrupt handler to ide_pc_intr. |
1da177e4 | 585 | * |
aa5d2de7 | 586 | * 2. On each interrupt, ide_pc_intr will be called. This step will be |
3c98bf34 | 587 | * repeated until the device signals us that no more interrupts will be issued. |
1da177e4 | 588 | * |
3c98bf34 BP |
589 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
590 | * process. In case of a successful initiation of a media access packet command, | |
591 | * the DSC bit will be set when the actual execution of the command is finished. | |
592 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
593 | * event. In this case, we define the request as "low priority request" by | |
594 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
595 | * exit the driver. | |
1da177e4 | 596 | * |
3c98bf34 BP |
597 | * ide.c will then give higher priority to requests which originate from the |
598 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 599 | * |
3c98bf34 | 600 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 601 | * |
3c98bf34 BP |
602 | * 5. In case an error was found, we queue a request sense packet command in |
603 | * front of the request queue and retry the operation up to | |
604 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 605 | * |
3c98bf34 BP |
606 | * 6. In case no error was found, or we decided to give up and not to retry |
607 | * again, the callback function will be called and then we will handle the next | |
608 | * request. | |
1da177e4 | 609 | */ |
1da177e4 | 610 | |
b788ee9c BZ |
611 | static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, |
612 | struct ide_cmd *cmd, | |
613 | struct ide_atapi_pc *pc) | |
1da177e4 | 614 | { |
1da177e4 | 615 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 616 | |
5e2040fd BZ |
617 | if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
618 | drive->failed_pc = pc; | |
2b9efba4 | 619 | |
1da177e4 | 620 | /* Set the current packet command */ |
2b9efba4 | 621 | drive->pc = pc; |
1da177e4 LT |
622 | |
623 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 624 | (pc->flags & PC_FLAG_ABORT)) { |
1da177e4 | 625 | /* |
3c98bf34 BP |
626 | * We will "abort" retrying a packet command in case legitimate |
627 | * error code was received (crossing a filemark, or end of the | |
628 | * media, for example). | |
1da177e4 | 629 | */ |
346331f8 | 630 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 631 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
632 | tape->sense_key == 2 && tape->asc == 4 && |
633 | (tape->ascq == 1 || tape->ascq == 8))) { | |
634 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
635 | "pc = %2x, key = %2x, " | |
636 | "asc = %2x, ascq = %2x\n", | |
637 | tape->name, pc->c[0], | |
638 | tape->sense_key, tape->asc, | |
639 | tape->ascq); | |
640 | } | |
641 | /* Giving up */ | |
c152cc1a | 642 | pc->error = IDE_DRV_ERROR_GENERAL; |
1da177e4 | 643 | } |
5e2040fd | 644 | drive->failed_pc = NULL; |
b14c7212 | 645 | drive->pc_callback(drive, 0); |
92f5daff | 646 | return ide_stopped; |
1da177e4 | 647 | } |
8004a8c9 | 648 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
649 | |
650 | pc->retries++; | |
1da177e4 | 651 | |
b788ee9c | 652 | return ide_issue_pc(drive, cmd); |
1da177e4 LT |
653 | } |
654 | ||
3c98bf34 | 655 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 656 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 | 657 | { |
7bf7420a | 658 | ide_init_pc(pc); |
90699ce2 | 659 | pc->c[0] = MODE_SENSE; |
1da177e4 | 660 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
661 | /* DBD = 1 - Don't return block descriptors */ |
662 | pc->c[1] = 8; | |
1da177e4 LT |
663 | pc->c[2] = page_code; |
664 | /* | |
665 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
666 | * | |
667 | * For SCSI this byte is defined as subpage instead of high byte | |
668 | * of length and some IDE drives seem to interpret it this way | |
669 | * and return an error when 255 is used. | |
670 | */ | |
671 | pc->c[3] = 0; | |
3c98bf34 BP |
672 | /* We will just discard data in that case */ |
673 | pc->c[4] = 255; | |
1da177e4 | 674 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 675 | pc->req_xfer = 12; |
1da177e4 | 676 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 677 | pc->req_xfer = 24; |
1da177e4 | 678 | else |
d236d74c | 679 | pc->req_xfer = 50; |
1da177e4 LT |
680 | } |
681 | ||
5a04cfa9 | 682 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 683 | { |
b73c7ee2 | 684 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 685 | idetape_tape_t *tape = drive->driver_data; |
2b9efba4 | 686 | struct ide_atapi_pc *pc = drive->pc; |
22c525b9 | 687 | u8 stat; |
1da177e4 | 688 | |
374e042c | 689 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 690 | |
3a7d2484 BZ |
691 | if (stat & ATA_DSC) { |
692 | if (stat & ATA_ERR) { | |
1da177e4 | 693 | /* Error detected */ |
90699ce2 | 694 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
695 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
696 | tape->name); | |
697 | /* Retry operation */ | |
6b544fcc | 698 | ide_retry_pc(drive); |
258ec411 | 699 | return ide_stopped; |
1da177e4 LT |
700 | } |
701 | pc->error = 0; | |
1da177e4 | 702 | } else { |
c152cc1a | 703 | pc->error = IDE_DRV_ERROR_GENERAL; |
5e2040fd | 704 | drive->failed_pc = NULL; |
1da177e4 | 705 | } |
b14c7212 | 706 | drive->pc_callback(drive, 0); |
1da177e4 LT |
707 | return ide_stopped; |
708 | } | |
709 | ||
cd2abbfe | 710 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
711 | struct ide_atapi_pc *pc, struct request *rq, |
712 | u8 opcode) | |
1da177e4 | 713 | { |
0014c75b BP |
714 | struct idetape_bh *bh = (struct idetape_bh *)rq->special; |
715 | unsigned int length = rq->current_nr_sectors; | |
716 | ||
7bf7420a | 717 | ide_init_pc(pc); |
860ff5ec | 718 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 719 | pc->c[1] = 1; |
1da177e4 | 720 | pc->bh = bh; |
d236d74c BP |
721 | pc->buf = NULL; |
722 | pc->buf_size = length * tape->blk_size; | |
723 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 724 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 725 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 726 | |
cd2abbfe BP |
727 | if (opcode == READ_6) { |
728 | pc->c[0] = READ_6; | |
729 | atomic_set(&bh->b_count, 0); | |
730 | } else if (opcode == WRITE_6) { | |
731 | pc->c[0] = WRITE_6; | |
732 | pc->flags |= PC_FLAG_WRITING; | |
733 | pc->b_data = bh->b_data; | |
734 | pc->b_count = atomic_read(&bh->b_count); | |
735 | } | |
0014c75b BP |
736 | |
737 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
738 | } |
739 | ||
1da177e4 LT |
740 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
741 | struct request *rq, sector_t block) | |
742 | { | |
b73c7ee2 | 743 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 744 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 745 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 746 | struct request *postponed_rq = tape->postponed_rq; |
b788ee9c | 747 | struct ide_cmd cmd; |
22c525b9 | 748 | u8 stat; |
1da177e4 | 749 | |
730616b2 MW |
750 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu," |
751 | " current_nr_sectors: %u\n", | |
752 | (unsigned long long)rq->sector, rq->nr_sectors, | |
753 | rq->current_nr_sectors); | |
1da177e4 | 754 | |
6b544fcc | 755 | if (!(blk_special_request(rq) || blk_sense_request(rq))) { |
3c98bf34 | 756 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 757 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 758 | "request queue (%d)\n", drive->name, rq->cmd_type); |
89f78b32 BZ |
759 | if (blk_fs_request(rq) == 0 && rq->errors == 0) |
760 | rq->errors = -EIO; | |
130e8867 | 761 | ide_complete_rq(drive, -EIO, ide_rq_bytes(rq)); |
1da177e4 LT |
762 | return ide_stopped; |
763 | } | |
764 | ||
3c98bf34 | 765 | /* Retry a failed packet command */ |
5e2040fd BZ |
766 | if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { |
767 | pc = drive->failed_pc; | |
28c7214b BZ |
768 | goto out; |
769 | } | |
5a04cfa9 | 770 | |
1da177e4 LT |
771 | if (postponed_rq != NULL) |
772 | if (rq != postponed_rq) { | |
773 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
774 | "Two DSC requests were queued\n"); | |
313afea7 | 775 | drive->failed_pc = NULL; |
6902a533 | 776 | rq->errors = 0; |
f974b196 | 777 | ide_complete_rq(drive, 0, blk_rq_bytes(rq)); |
1da177e4 LT |
778 | return ide_stopped; |
779 | } | |
1da177e4 LT |
780 | |
781 | tape->postponed_rq = NULL; | |
782 | ||
783 | /* | |
784 | * If the tape is still busy, postpone our request and service | |
785 | * the other device meanwhile. | |
786 | */ | |
374e042c | 787 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 788 | |
97100fc8 BZ |
789 | if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && |
790 | (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) | |
f2e3ab52 | 791 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 | 792 | |
97100fc8 | 793 | if (drive->dev_flags & IDE_DFLAG_POST_RESET) { |
f2e3ab52 | 794 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
97100fc8 | 795 | drive->dev_flags &= ~IDE_DFLAG_POST_RESET; |
1da177e4 LT |
796 | } |
797 | ||
f2e3ab52 | 798 | if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && |
3a7d2484 | 799 | (stat & ATA_DSC) == 0) { |
1da177e4 LT |
800 | if (postponed_rq == NULL) { |
801 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 802 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
803 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
804 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
805 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
806 | tape->name); | |
83dd5735 | 807 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
808 | idetape_media_access_finished(drive); |
809 | return ide_stopped; | |
810 | } else { | |
811 | return ide_do_reset(drive); | |
812 | } | |
5a04cfa9 BP |
813 | } else if (time_after(jiffies, |
814 | tape->dsc_polling_start + | |
815 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 816 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
817 | idetape_postpone_request(drive); |
818 | return ide_stopped; | |
819 | } | |
83dd5735 | 820 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
2e8a6f89 | 821 | pc = &tape->queued_pc; |
0014c75b | 822 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
823 | goto out; |
824 | } | |
83dd5735 | 825 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
2e8a6f89 | 826 | pc = &tape->queued_pc; |
0014c75b | 827 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
828 | goto out; |
829 | } | |
83dd5735 | 830 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
c267cc1c | 831 | pc = (struct ide_atapi_pc *)rq->special; |
83dd5735 BP |
832 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
833 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
834 | goto out; |
835 | } | |
83dd5735 | 836 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
837 | idetape_media_access_finished(drive); |
838 | return ide_stopped; | |
839 | } | |
840 | BUG(); | |
28c7214b | 841 | |
f2e3ab52 | 842 | out: |
6b544fcc BP |
843 | /* prepare sense request for this command */ |
844 | ide_prep_sense(drive, rq); | |
845 | ||
b788ee9c BZ |
846 | memset(&cmd, 0, sizeof(cmd)); |
847 | ||
848 | if (rq_data_dir(rq)) | |
849 | cmd.tf_flags |= IDE_TFLAG_WRITE; | |
850 | ||
851 | cmd.rq = rq; | |
852 | ||
853 | return ide_tape_issue_pc(drive, &cmd, pc); | |
1da177e4 LT |
854 | } |
855 | ||
1da177e4 | 856 | /* |
41aa1706 | 857 | * The function below uses __get_free_pages to allocate a data buffer of size |
f73850a3 | 858 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
3c98bf34 | 859 | * much as possible. |
1da177e4 | 860 | * |
41aa1706 BP |
861 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
862 | * failure. | |
1da177e4 | 863 | */ |
077e3bdb BP |
864 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, |
865 | int full, int clear) | |
1da177e4 | 866 | { |
077e3bdb | 867 | struct idetape_bh *prev_bh, *bh, *merge_bh; |
a997a435 | 868 | int pages = tape->pages_per_buffer; |
41aa1706 | 869 | unsigned int order, b_allocd; |
1da177e4 LT |
870 | char *b_data = NULL; |
871 | ||
077e3bdb BP |
872 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
873 | bh = merge_bh; | |
1da177e4 LT |
874 | if (bh == NULL) |
875 | goto abort; | |
41aa1706 BP |
876 | |
877 | order = fls(pages) - 1; | |
878 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 879 | if (!bh->b_data) |
1da177e4 | 880 | goto abort; |
41aa1706 BP |
881 | b_allocd = (1 << order) * PAGE_SIZE; |
882 | pages &= (order-1); | |
883 | ||
1da177e4 | 884 | if (clear) |
41aa1706 BP |
885 | memset(bh->b_data, 0, b_allocd); |
886 | bh->b_reqnext = NULL; | |
887 | bh->b_size = b_allocd; | |
1da177e4 LT |
888 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
889 | ||
41aa1706 BP |
890 | while (pages) { |
891 | order = fls(pages) - 1; | |
892 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 893 | if (!b_data) |
1da177e4 | 894 | goto abort; |
41aa1706 BP |
895 | b_allocd = (1 << order) * PAGE_SIZE; |
896 | ||
1da177e4 | 897 | if (clear) |
41aa1706 BP |
898 | memset(b_data, 0, b_allocd); |
899 | ||
900 | /* newly allocated page frames below buffer header or ...*/ | |
901 | if (bh->b_data == b_data + b_allocd) { | |
902 | bh->b_size += b_allocd; | |
903 | bh->b_data -= b_allocd; | |
1da177e4 | 904 | if (full) |
41aa1706 | 905 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
906 | continue; |
907 | } | |
41aa1706 | 908 | /* they are above the header */ |
1da177e4 | 909 | if (b_data == bh->b_data + bh->b_size) { |
41aa1706 | 910 | bh->b_size += b_allocd; |
1da177e4 | 911 | if (full) |
41aa1706 | 912 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
913 | continue; |
914 | } | |
915 | prev_bh = bh; | |
5a04cfa9 BP |
916 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
917 | if (!bh) { | |
41aa1706 | 918 | free_pages((unsigned long) b_data, order); |
1da177e4 LT |
919 | goto abort; |
920 | } | |
921 | bh->b_reqnext = NULL; | |
922 | bh->b_data = b_data; | |
41aa1706 | 923 | bh->b_size = b_allocd; |
1da177e4 LT |
924 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
925 | prev_bh->b_reqnext = bh; | |
41aa1706 BP |
926 | |
927 | pages &= (order-1); | |
1da177e4 | 928 | } |
41aa1706 | 929 | |
1da177e4 LT |
930 | bh->b_size -= tape->excess_bh_size; |
931 | if (full) | |
932 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
077e3bdb | 933 | return merge_bh; |
1da177e4 | 934 | abort: |
077e3bdb | 935 | ide_tape_kfree_buffer(tape); |
1da177e4 LT |
936 | return NULL; |
937 | } | |
938 | ||
5a04cfa9 | 939 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
8646c88f | 940 | const char __user *buf, int n) |
1da177e4 LT |
941 | { |
942 | struct idetape_bh *bh = tape->bh; | |
943 | int count; | |
dcd96379 | 944 | int ret = 0; |
1da177e4 LT |
945 | |
946 | while (n) { | |
1da177e4 | 947 | if (bh == NULL) { |
5a04cfa9 BP |
948 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
949 | __func__); | |
dcd96379 | 950 | return 1; |
1da177e4 | 951 | } |
5a04cfa9 BP |
952 | count = min((unsigned int) |
953 | (bh->b_size - atomic_read(&bh->b_count)), | |
954 | (unsigned int)n); | |
955 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
956 | count)) | |
dcd96379 | 957 | ret = 1; |
1da177e4 LT |
958 | n -= count; |
959 | atomic_add(count, &bh->b_count); | |
960 | buf += count; | |
961 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
962 | bh = bh->b_reqnext; | |
963 | if (bh) | |
964 | atomic_set(&bh->b_count, 0); | |
965 | } | |
966 | } | |
967 | tape->bh = bh; | |
dcd96379 | 968 | return ret; |
1da177e4 LT |
969 | } |
970 | ||
5a04cfa9 | 971 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
99d74e61 | 972 | int n) |
1da177e4 LT |
973 | { |
974 | struct idetape_bh *bh = tape->bh; | |
975 | int count; | |
dcd96379 | 976 | int ret = 0; |
1da177e4 LT |
977 | |
978 | while (n) { | |
1da177e4 | 979 | if (bh == NULL) { |
5a04cfa9 BP |
980 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
981 | __func__); | |
dcd96379 | 982 | return 1; |
1da177e4 | 983 | } |
1da177e4 | 984 | count = min(tape->b_count, n); |
dcd96379 DW |
985 | if (copy_to_user(buf, tape->b_data, count)) |
986 | ret = 1; | |
1da177e4 LT |
987 | n -= count; |
988 | tape->b_data += count; | |
989 | tape->b_count -= count; | |
990 | buf += count; | |
991 | if (!tape->b_count) { | |
5a04cfa9 BP |
992 | bh = bh->b_reqnext; |
993 | tape->bh = bh; | |
1da177e4 LT |
994 | if (bh) { |
995 | tape->b_data = bh->b_data; | |
996 | tape->b_count = atomic_read(&bh->b_count); | |
997 | } | |
998 | } | |
999 | } | |
dcd96379 | 1000 | return ret; |
1da177e4 LT |
1001 | } |
1002 | ||
077e3bdb | 1003 | static void idetape_init_merge_buffer(idetape_tape_t *tape) |
1da177e4 | 1004 | { |
077e3bdb BP |
1005 | struct idetape_bh *bh = tape->merge_bh; |
1006 | tape->bh = tape->merge_bh; | |
5a04cfa9 | 1007 | |
54abf37e | 1008 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 LT |
1009 | atomic_set(&bh->b_count, 0); |
1010 | else { | |
1011 | tape->b_data = bh->b_data; | |
1012 | tape->b_count = atomic_read(&bh->b_count); | |
1013 | } | |
1014 | } | |
1015 | ||
1da177e4 | 1016 | /* |
3c98bf34 BP |
1017 | * Write a filemark if write_filemark=1. Flush the device buffers without |
1018 | * writing a filemark otherwise. | |
1da177e4 | 1019 | */ |
5a04cfa9 | 1020 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 1021 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 | 1022 | { |
7bf7420a | 1023 | ide_init_pc(pc); |
90699ce2 | 1024 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 1025 | pc->c[4] = write_filemark; |
346331f8 | 1026 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1027 | } |
1028 | ||
1da177e4 LT |
1029 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
1030 | { | |
1031 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1032 | struct gendisk *disk = tape->disk; |
1da177e4 LT |
1033 | int load_attempted = 0; |
1034 | ||
3c98bf34 | 1035 | /* Wait for the tape to become ready */ |
f2e3ab52 | 1036 | set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
1da177e4 LT |
1037 | timeout += jiffies; |
1038 | while (time_before(jiffies, timeout)) { | |
de699ad5 | 1039 | if (ide_do_test_unit_ready(drive, disk) == 0) |
1da177e4 LT |
1040 | return 0; |
1041 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
1042 | || (tape->asc == 0x3A)) { |
1043 | /* no media */ | |
1da177e4 LT |
1044 | if (load_attempted) |
1045 | return -ENOMEDIUM; | |
0c8a6c7a | 1046 | ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
1da177e4 LT |
1047 | load_attempted = 1; |
1048 | /* not about to be ready */ | |
1049 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1050 | (tape->ascq == 1 || tape->ascq == 8))) | |
1051 | return -EIO; | |
80ce45fd | 1052 | msleep(100); |
1da177e4 LT |
1053 | } |
1054 | return -EIO; | |
1055 | } | |
1056 | ||
5a04cfa9 | 1057 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 1058 | { |
2ac07d92 | 1059 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1060 | struct ide_atapi_pc pc; |
1da177e4 LT |
1061 | int rc; |
1062 | ||
1063 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
2ac07d92 | 1064 | rc = ide_queue_pc_tail(drive, tape->disk, &pc); |
5a04cfa9 | 1065 | if (rc) |
1da177e4 LT |
1066 | return rc; |
1067 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1068 | return 0; | |
1069 | } | |
1070 | ||
d236d74c | 1071 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1072 | { |
7bf7420a | 1073 | ide_init_pc(pc); |
90699ce2 | 1074 | pc->c[0] = READ_POSITION; |
d236d74c | 1075 | pc->req_xfer = 20; |
1da177e4 LT |
1076 | } |
1077 | ||
5a04cfa9 | 1078 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
1079 | { |
1080 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1081 | struct ide_atapi_pc pc; |
1da177e4 LT |
1082 | int position; |
1083 | ||
8004a8c9 | 1084 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
1085 | |
1086 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1087 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) |
1da177e4 | 1088 | return -1; |
54bb2074 | 1089 | position = tape->first_frame; |
1da177e4 LT |
1090 | return position; |
1091 | } | |
1092 | ||
d236d74c BP |
1093 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
1094 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1095 | unsigned int block, u8 partition, int skip) |
1da177e4 | 1096 | { |
7bf7420a | 1097 | ide_init_pc(pc); |
90699ce2 | 1098 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 1099 | pc->c[1] = 2; |
860ff5ec | 1100 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 1101 | pc->c[8] = partition; |
346331f8 | 1102 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1103 | } |
1104 | ||
ec0fdb01 | 1105 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1106 | { |
1107 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1108 | |
54abf37e | 1109 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 1110 | return; |
1da177e4 | 1111 | |
f2e3ab52 | 1112 | clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); |
01a63aeb | 1113 | tape->merge_bh_size = 0; |
077e3bdb BP |
1114 | if (tape->merge_bh != NULL) { |
1115 | ide_tape_kfree_buffer(tape); | |
1116 | tape->merge_bh = NULL; | |
1da177e4 LT |
1117 | } |
1118 | ||
54abf37e | 1119 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1120 | } |
1121 | ||
1122 | /* | |
3c98bf34 BP |
1123 | * Position the tape to the requested block using the LOCATE packet command. |
1124 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1125 | * all higher level operations, we queue the commands at the tail of the request | |
1126 | * queue and wait for their completion. | |
1da177e4 | 1127 | */ |
5a04cfa9 BP |
1128 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
1129 | u8 partition, int skip) | |
1da177e4 LT |
1130 | { |
1131 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1132 | struct gendisk *disk = tape->disk; |
1da177e4 | 1133 | int retval; |
d236d74c | 1134 | struct ide_atapi_pc pc; |
1da177e4 | 1135 | |
54abf37e | 1136 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 1137 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1138 | idetape_wait_ready(drive, 60 * 5 * HZ); |
1139 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
2ac07d92 | 1140 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1141 | if (retval) |
1142 | return (retval); | |
1143 | ||
1144 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1145 | return ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1146 | } |
1147 | ||
ec0fdb01 | 1148 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 1149 | int restore_position) |
1da177e4 LT |
1150 | { |
1151 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1152 | int seek, position; |
1153 | ||
ec0fdb01 | 1154 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1155 | if (restore_position) { |
1156 | position = idetape_read_position(drive); | |
9798630a | 1157 | seek = position > 0 ? position : 0; |
1da177e4 | 1158 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 1159 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 1160 | " %s\n", tape->name, __func__); |
1da177e4 LT |
1161 | return; |
1162 | } | |
1163 | } | |
1164 | } | |
1165 | ||
1166 | /* | |
3c98bf34 BP |
1167 | * Generate a read/write request for the block device interface and wait for it |
1168 | * to be serviced. | |
1da177e4 | 1169 | */ |
5a04cfa9 BP |
1170 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
1171 | struct idetape_bh *bh) | |
1da177e4 LT |
1172 | { |
1173 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a FT |
1174 | struct request *rq; |
1175 | int ret, errors; | |
1da177e4 | 1176 | |
8004a8c9 BP |
1177 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
1178 | ||
64ea1b4a FT |
1179 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1180 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1181 | rq->cmd[13] = cmd; |
64ea1b4a FT |
1182 | rq->rq_disk = tape->disk; |
1183 | rq->special = (void *)bh; | |
1184 | rq->sector = tape->first_frame; | |
1185 | rq->nr_sectors = blocks; | |
1186 | rq->current_nr_sectors = blocks; | |
1187 | blk_execute_rq(drive->queue, tape->disk, rq, 0); | |
1188 | ||
1189 | errors = rq->errors; | |
1190 | ret = tape->blk_size * (blocks - rq->current_nr_sectors); | |
1191 | blk_put_request(rq); | |
1da177e4 LT |
1192 | |
1193 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1194 | return 0; | |
1195 | ||
077e3bdb BP |
1196 | if (tape->merge_bh) |
1197 | idetape_init_merge_buffer(tape); | |
c152cc1a | 1198 | if (errors == IDE_DRV_ERROR_GENERAL) |
1da177e4 | 1199 | return -EIO; |
64ea1b4a | 1200 | return ret; |
1da177e4 LT |
1201 | } |
1202 | ||
d236d74c | 1203 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1204 | { |
7bf7420a | 1205 | ide_init_pc(pc); |
90699ce2 | 1206 | pc->c[0] = INQUIRY; |
5a04cfa9 | 1207 | pc->c[4] = 254; |
d236d74c | 1208 | pc->req_xfer = 254; |
1da177e4 LT |
1209 | } |
1210 | ||
d236d74c BP |
1211 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
1212 | struct ide_atapi_pc *pc) | |
1da177e4 | 1213 | { |
7bf7420a | 1214 | ide_init_pc(pc); |
90699ce2 | 1215 | pc->c[0] = REZERO_UNIT; |
346331f8 | 1216 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1217 | } |
1218 | ||
d236d74c | 1219 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1220 | { |
7bf7420a | 1221 | ide_init_pc(pc); |
90699ce2 | 1222 | pc->c[0] = ERASE; |
1da177e4 | 1223 | pc->c[1] = 1; |
346331f8 | 1224 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1225 | } |
1226 | ||
d236d74c | 1227 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 | 1228 | { |
7bf7420a | 1229 | ide_init_pc(pc); |
90699ce2 | 1230 | pc->c[0] = SPACE; |
860ff5ec | 1231 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 1232 | pc->c[1] = cmd; |
346331f8 | 1233 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1234 | } |
1235 | ||
97c566ce | 1236 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 1237 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1238 | { |
1239 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1240 | |
8004a8c9 | 1241 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 1242 | |
0aa4b01e | 1243 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
077e3bdb | 1244 | blocks, tape->merge_bh); |
1da177e4 LT |
1245 | } |
1246 | ||
d9df937a | 1247 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1248 | { |
1249 | idetape_tape_t *tape = drive->driver_data; | |
1250 | int blocks, min; | |
1251 | struct idetape_bh *bh; | |
55a5d291 | 1252 | |
54abf37e | 1253 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 1254 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 1255 | " but we are not writing.\n"); |
1da177e4 LT |
1256 | return; |
1257 | } | |
01a63aeb | 1258 | if (tape->merge_bh_size > tape->buffer_size) { |
1da177e4 | 1259 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
01a63aeb | 1260 | tape->merge_bh_size = tape->buffer_size; |
1da177e4 | 1261 | } |
01a63aeb BP |
1262 | if (tape->merge_bh_size) { |
1263 | blocks = tape->merge_bh_size / tape->blk_size; | |
1264 | if (tape->merge_bh_size % tape->blk_size) { | |
1da177e4 LT |
1265 | unsigned int i; |
1266 | ||
1267 | blocks++; | |
01a63aeb | 1268 | i = tape->blk_size - tape->merge_bh_size % |
54bb2074 | 1269 | tape->blk_size; |
1da177e4 LT |
1270 | bh = tape->bh->b_reqnext; |
1271 | while (bh) { | |
1272 | atomic_set(&bh->b_count, 0); | |
1273 | bh = bh->b_reqnext; | |
1274 | } | |
1275 | bh = tape->bh; | |
1276 | while (i) { | |
1277 | if (bh == NULL) { | |
5a04cfa9 BP |
1278 | printk(KERN_INFO "ide-tape: bug," |
1279 | " bh NULL\n"); | |
1da177e4 LT |
1280 | break; |
1281 | } | |
5a04cfa9 BP |
1282 | min = min(i, (unsigned int)(bh->b_size - |
1283 | atomic_read(&bh->b_count))); | |
1284 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1285 | 0, min); | |
1da177e4 LT |
1286 | atomic_add(min, &bh->b_count); |
1287 | i -= min; | |
1288 | bh = bh->b_reqnext; | |
1289 | } | |
1290 | } | |
1291 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
01a63aeb | 1292 | tape->merge_bh_size = 0; |
1da177e4 | 1293 | } |
077e3bdb BP |
1294 | if (tape->merge_bh != NULL) { |
1295 | ide_tape_kfree_buffer(tape); | |
1296 | tape->merge_bh = NULL; | |
1da177e4 | 1297 | } |
54abf37e | 1298 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1299 | } |
1300 | ||
83042b24 | 1301 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
1302 | { |
1303 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1304 | int bytes_read; |
1da177e4 LT |
1305 | |
1306 | /* Initialize read operation */ | |
54abf37e BP |
1307 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1308 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
d9df937a | 1309 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1310 | idetape_flush_tape_buffers(drive); |
1311 | } | |
077e3bdb | 1312 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1313 | printk(KERN_ERR "ide-tape: merge_bh_size should be" |
5a04cfa9 | 1314 | " 0 now\n"); |
01a63aeb | 1315 | tape->merge_bh_size = 0; |
1da177e4 | 1316 | } |
077e3bdb BP |
1317 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1318 | if (!tape->merge_bh) | |
1da177e4 | 1319 | return -ENOMEM; |
54abf37e | 1320 | tape->chrdev_dir = IDETAPE_DIR_READ; |
1da177e4 LT |
1321 | |
1322 | /* | |
3c98bf34 BP |
1323 | * Issue a read 0 command to ensure that DSC handshake is |
1324 | * switched from completion mode to buffer available mode. | |
1325 | * No point in issuing this if DSC overlap isn't supported, some | |
1326 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 | 1327 | */ |
97100fc8 | 1328 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { |
5a04cfa9 BP |
1329 | bytes_read = idetape_queue_rw_tail(drive, |
1330 | REQ_IDETAPE_READ, 0, | |
077e3bdb | 1331 | tape->merge_bh); |
1da177e4 | 1332 | if (bytes_read < 0) { |
077e3bdb BP |
1333 | ide_tape_kfree_buffer(tape); |
1334 | tape->merge_bh = NULL; | |
54abf37e | 1335 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1336 | return bytes_read; |
1337 | } | |
1338 | } | |
1339 | } | |
5e69bd95 | 1340 | |
1da177e4 LT |
1341 | return 0; |
1342 | } | |
1343 | ||
5bd50dc6 | 1344 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1345 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1346 | { |
1347 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1348 | |
8004a8c9 | 1349 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1350 | |
3c98bf34 | 1351 | /* If we are at a filemark, return a read length of 0 */ |
f2e3ab52 | 1352 | if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 LT |
1353 | return 0; |
1354 | ||
83042b24 | 1355 | idetape_init_read(drive); |
5e69bd95 | 1356 | |
5e69bd95 | 1357 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
077e3bdb | 1358 | tape->merge_bh); |
1da177e4 LT |
1359 | } |
1360 | ||
5a04cfa9 | 1361 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1362 | { |
1363 | idetape_tape_t *tape = drive->driver_data; | |
1364 | struct idetape_bh *bh; | |
1365 | int blocks; | |
3c98bf34 | 1366 | |
1da177e4 LT |
1367 | while (bcount) { |
1368 | unsigned int count; | |
1369 | ||
077e3bdb | 1370 | bh = tape->merge_bh; |
f73850a3 | 1371 | count = min(tape->buffer_size, bcount); |
1da177e4 | 1372 | bcount -= count; |
54bb2074 | 1373 | blocks = count / tape->blk_size; |
1da177e4 | 1374 | while (count) { |
5a04cfa9 BP |
1375 | atomic_set(&bh->b_count, |
1376 | min(count, (unsigned int)bh->b_size)); | |
1da177e4 LT |
1377 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
1378 | count -= atomic_read(&bh->b_count); | |
1379 | bh = bh->b_reqnext; | |
1380 | } | |
5a04cfa9 | 1381 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
077e3bdb | 1382 | tape->merge_bh); |
1da177e4 LT |
1383 | } |
1384 | } | |
1385 | ||
1da177e4 | 1386 | /* |
3c98bf34 BP |
1387 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1388 | * currently support only one partition. | |
1389 | */ | |
5a04cfa9 | 1390 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 | 1391 | { |
2ac07d92 BZ |
1392 | struct ide_tape_obj *tape = drive->driver_data; |
1393 | struct gendisk *disk = tape->disk; | |
1da177e4 | 1394 | int retval; |
d236d74c | 1395 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1396 | |
1397 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1398 | ||
1da177e4 | 1399 | idetape_create_rewind_cmd(drive, &pc); |
2ac07d92 | 1400 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1401 | if (retval) |
1402 | return retval; | |
1403 | ||
1404 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1405 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1406 | if (retval) |
1407 | return retval; | |
1408 | return 0; | |
1409 | } | |
1410 | ||
3c98bf34 | 1411 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1412 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1413 | unsigned long arg) | |
1da177e4 LT |
1414 | { |
1415 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1416 | void __user *argp = (void __user *)arg; |
1417 | ||
d59823fa BP |
1418 | struct idetape_config { |
1419 | int dsc_rw_frequency; | |
1420 | int dsc_media_access_frequency; | |
1421 | int nr_stages; | |
1422 | } config; | |
1423 | ||
8004a8c9 BP |
1424 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1425 | ||
1da177e4 | 1426 | switch (cmd) { |
5a04cfa9 BP |
1427 | case 0x0340: |
1428 | if (copy_from_user(&config, argp, sizeof(config))) | |
1429 | return -EFAULT; | |
1430 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1431 | break; |
1432 | case 0x0350: | |
1433 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1434 | config.nr_stages = 1; |
5a04cfa9 BP |
1435 | if (copy_to_user(argp, &config, sizeof(config))) |
1436 | return -EFAULT; | |
1437 | break; | |
1438 | default: | |
1439 | return -EIO; | |
1da177e4 LT |
1440 | } |
1441 | return 0; | |
1442 | } | |
1443 | ||
5a04cfa9 BP |
1444 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1445 | int mt_count) | |
1da177e4 LT |
1446 | { |
1447 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1448 | struct gendisk *disk = tape->disk; |
d236d74c | 1449 | struct ide_atapi_pc pc; |
5a04cfa9 | 1450 | int retval, count = 0; |
b6422013 | 1451 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1452 | |
1453 | if (mt_count == 0) | |
1454 | return 0; | |
1455 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1456 | if (!sprev) |
1da177e4 | 1457 | return -EIO; |
5a04cfa9 | 1458 | mt_count = -mt_count; |
1da177e4 LT |
1459 | } |
1460 | ||
54abf37e | 1461 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
01a63aeb | 1462 | tape->merge_bh_size = 0; |
f2e3ab52 | 1463 | if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 | 1464 | ++count; |
ec0fdb01 | 1465 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1466 | } |
1467 | ||
1da177e4 | 1468 | switch (mt_op) { |
5a04cfa9 BP |
1469 | case MTFSF: |
1470 | case MTBSF: | |
1471 | idetape_create_space_cmd(&pc, mt_count - count, | |
1472 | IDETAPE_SPACE_OVER_FILEMARK); | |
2ac07d92 | 1473 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1474 | case MTFSFM: |
1475 | case MTBSFM: | |
1476 | if (!sprev) | |
1477 | return -EIO; | |
1478 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1479 | mt_count - count); | |
1480 | if (retval) | |
1481 | return retval; | |
1482 | count = (MTBSFM == mt_op ? 1 : -1); | |
1483 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1484 | default: | |
1485 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1486 | mt_op); | |
1487 | return -EIO; | |
1da177e4 LT |
1488 | } |
1489 | } | |
1490 | ||
1da177e4 | 1491 | /* |
3c98bf34 | 1492 | * Our character device read / write functions. |
1da177e4 | 1493 | * |
3c98bf34 BP |
1494 | * The tape is optimized to maximize throughput when it is transferring an |
1495 | * integral number of the "continuous transfer limit", which is a parameter of | |
1496 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1497 | * |
3c98bf34 BP |
1498 | * As of version 1.3 of the driver, the character device provides an abstract |
1499 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1500 | * same backup/restore procedure is supported. The driver will internally | |
1501 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1502 | * between the user's block size to the recommended size will only result in a | |
1503 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1504 | * This is not applicable to Onstream. | |
1da177e4 | 1505 | */ |
5a04cfa9 BP |
1506 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1507 | size_t count, loff_t *ppos) | |
1da177e4 | 1508 | { |
5aeddf90 | 1509 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1510 | ide_drive_t *drive = tape->drive; |
5a04cfa9 | 1511 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 1512 | ssize_t ret = 0; |
b6422013 | 1513 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 1514 | |
8004a8c9 | 1515 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1516 | |
54abf37e | 1517 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
f2e3ab52 | 1518 | if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) |
54bb2074 BP |
1519 | if (count > tape->blk_size && |
1520 | (count % tape->blk_size) == 0) | |
1521 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1522 | } |
83042b24 | 1523 | rc = idetape_init_read(drive); |
8d06bfad | 1524 | if (rc < 0) |
1da177e4 LT |
1525 | return rc; |
1526 | if (count == 0) | |
1527 | return (0); | |
01a63aeb BP |
1528 | if (tape->merge_bh_size) { |
1529 | actually_read = min((unsigned int)(tape->merge_bh_size), | |
5a04cfa9 | 1530 | (unsigned int)count); |
99d74e61 | 1531 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
dcd96379 | 1532 | ret = -EFAULT; |
1da177e4 | 1533 | buf += actually_read; |
01a63aeb | 1534 | tape->merge_bh_size -= actually_read; |
1da177e4 LT |
1535 | count -= actually_read; |
1536 | } | |
f73850a3 | 1537 | while (count >= tape->buffer_size) { |
b6422013 | 1538 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1539 | if (bytes_read <= 0) |
1540 | goto finish; | |
99d74e61 | 1541 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
dcd96379 | 1542 | ret = -EFAULT; |
1da177e4 LT |
1543 | buf += bytes_read; |
1544 | count -= bytes_read; | |
1545 | actually_read += bytes_read; | |
1546 | } | |
1547 | if (count) { | |
b6422013 | 1548 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1549 | if (bytes_read <= 0) |
1550 | goto finish; | |
1551 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
99d74e61 | 1552 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
dcd96379 | 1553 | ret = -EFAULT; |
1da177e4 | 1554 | actually_read += temp; |
01a63aeb | 1555 | tape->merge_bh_size = bytes_read-temp; |
1da177e4 LT |
1556 | } |
1557 | finish: | |
f2e3ab52 | 1558 | if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { |
8004a8c9 BP |
1559 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1560 | ||
1da177e4 LT |
1561 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1562 | return 0; | |
1563 | } | |
dcd96379 | 1564 | |
5a04cfa9 | 1565 | return ret ? ret : actually_read; |
1da177e4 LT |
1566 | } |
1567 | ||
5a04cfa9 | 1568 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1569 | size_t count, loff_t *ppos) |
1570 | { | |
5aeddf90 | 1571 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1572 | ide_drive_t *drive = tape->drive; |
dcd96379 DW |
1573 | ssize_t actually_written = 0; |
1574 | ssize_t ret = 0; | |
b6422013 | 1575 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
1576 | |
1577 | /* The drive is write protected. */ | |
1578 | if (tape->write_prot) | |
1579 | return -EACCES; | |
1580 | ||
8004a8c9 | 1581 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1582 | |
1583 | /* Initialize write operation */ | |
54abf37e BP |
1584 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
1585 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1586 | ide_tape_discard_merge_buffer(drive, 1); |
077e3bdb | 1587 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1588 | printk(KERN_ERR "ide-tape: merge_bh_size " |
1da177e4 | 1589 | "should be 0 now\n"); |
01a63aeb | 1590 | tape->merge_bh_size = 0; |
1da177e4 | 1591 | } |
077e3bdb BP |
1592 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1593 | if (!tape->merge_bh) | |
1da177e4 | 1594 | return -ENOMEM; |
54abf37e | 1595 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
077e3bdb | 1596 | idetape_init_merge_buffer(tape); |
1da177e4 LT |
1597 | |
1598 | /* | |
3c98bf34 BP |
1599 | * Issue a write 0 command to ensure that DSC handshake is |
1600 | * switched from completion mode to buffer available mode. No | |
1601 | * point in issuing this if DSC overlap isn't supported, some | |
1602 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 | 1603 | */ |
97100fc8 | 1604 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { |
5a04cfa9 BP |
1605 | ssize_t retval = idetape_queue_rw_tail(drive, |
1606 | REQ_IDETAPE_WRITE, 0, | |
077e3bdb | 1607 | tape->merge_bh); |
1da177e4 | 1608 | if (retval < 0) { |
077e3bdb BP |
1609 | ide_tape_kfree_buffer(tape); |
1610 | tape->merge_bh = NULL; | |
54abf37e | 1611 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1612 | return retval; |
1613 | } | |
1614 | } | |
1615 | } | |
1616 | if (count == 0) | |
1617 | return (0); | |
01a63aeb BP |
1618 | if (tape->merge_bh_size) { |
1619 | if (tape->merge_bh_size >= tape->buffer_size) { | |
5a04cfa9 | 1620 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
01a63aeb | 1621 | tape->merge_bh_size = 0; |
1da177e4 | 1622 | } |
5a04cfa9 | 1623 | actually_written = min((unsigned int) |
01a63aeb | 1624 | (tape->buffer_size - tape->merge_bh_size), |
5a04cfa9 | 1625 | (unsigned int)count); |
8646c88f | 1626 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
dcd96379 | 1627 | ret = -EFAULT; |
1da177e4 | 1628 | buf += actually_written; |
01a63aeb | 1629 | tape->merge_bh_size += actually_written; |
1da177e4 LT |
1630 | count -= actually_written; |
1631 | ||
01a63aeb | 1632 | if (tape->merge_bh_size == tape->buffer_size) { |
dcd96379 | 1633 | ssize_t retval; |
01a63aeb | 1634 | tape->merge_bh_size = 0; |
b6422013 | 1635 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
1636 | if (retval <= 0) |
1637 | return (retval); | |
1638 | } | |
1639 | } | |
f73850a3 | 1640 | while (count >= tape->buffer_size) { |
dcd96379 | 1641 | ssize_t retval; |
f73850a3 | 1642 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
dcd96379 | 1643 | ret = -EFAULT; |
f73850a3 BP |
1644 | buf += tape->buffer_size; |
1645 | count -= tape->buffer_size; | |
b6422013 | 1646 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 1647 | actually_written += tape->buffer_size; |
1da177e4 LT |
1648 | if (retval <= 0) |
1649 | return (retval); | |
1650 | } | |
1651 | if (count) { | |
1652 | actually_written += count; | |
8646c88f | 1653 | if (idetape_copy_stage_from_user(tape, buf, count)) |
dcd96379 | 1654 | ret = -EFAULT; |
01a63aeb | 1655 | tape->merge_bh_size += count; |
1da177e4 | 1656 | } |
5a04cfa9 | 1657 | return ret ? ret : actually_written; |
1da177e4 LT |
1658 | } |
1659 | ||
5a04cfa9 | 1660 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1661 | { |
2ac07d92 | 1662 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1663 | struct ide_atapi_pc pc; |
1da177e4 LT |
1664 | |
1665 | /* Write a filemark */ | |
1666 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
2ac07d92 | 1667 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
1da177e4 LT |
1668 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
1669 | return -EIO; | |
1670 | } | |
1671 | return 0; | |
1672 | } | |
1673 | ||
1674 | /* | |
d99c9da2 BP |
1675 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1676 | * requested. | |
1da177e4 | 1677 | * |
d99c9da2 BP |
1678 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1679 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1680 | * usually not supported. |
1da177e4 | 1681 | * |
d99c9da2 | 1682 | * The following commands are currently not supported: |
1da177e4 | 1683 | * |
d99c9da2 BP |
1684 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1685 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1686 | */ |
d99c9da2 | 1687 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1688 | { |
1689 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1690 | struct gendisk *disk = tape->disk; |
d236d74c | 1691 | struct ide_atapi_pc pc; |
5a04cfa9 | 1692 | int i, retval; |
1da177e4 | 1693 | |
8004a8c9 BP |
1694 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
1695 | mt_op, mt_count); | |
5a04cfa9 | 1696 | |
1da177e4 | 1697 | switch (mt_op) { |
5a04cfa9 BP |
1698 | case MTFSF: |
1699 | case MTFSFM: | |
1700 | case MTBSF: | |
1701 | case MTBSFM: | |
1702 | if (!mt_count) | |
1703 | return 0; | |
1704 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1705 | default: | |
1706 | break; | |
1da177e4 | 1707 | } |
5a04cfa9 | 1708 | |
1da177e4 | 1709 | switch (mt_op) { |
5a04cfa9 BP |
1710 | case MTWEOF: |
1711 | if (tape->write_prot) | |
1712 | return -EACCES; | |
ec0fdb01 | 1713 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1714 | for (i = 0; i < mt_count; i++) { |
1715 | retval = idetape_write_filemark(drive); | |
1716 | if (retval) | |
1717 | return retval; | |
1718 | } | |
1719 | return 0; | |
1720 | case MTREW: | |
ec0fdb01 | 1721 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1722 | if (idetape_rewind_tape(drive)) |
1723 | return -EIO; | |
1724 | return 0; | |
1725 | case MTLOAD: | |
ec0fdb01 | 1726 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1727 | return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1728 | case MTUNLOAD: |
1729 | case MTOFFL: | |
1730 | /* | |
1731 | * If door is locked, attempt to unlock before | |
1732 | * attempting to eject. | |
1733 | */ | |
1734 | if (tape->door_locked) { | |
0578042d | 1735 | if (!ide_set_media_lock(drive, disk, 0)) |
385a4b87 | 1736 | tape->door_locked = DOOR_UNLOCKED; |
5a04cfa9 | 1737 | } |
ec0fdb01 | 1738 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1739 | retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); |
5a04cfa9 | 1740 | if (!retval) |
f2e3ab52 | 1741 | clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
5a04cfa9 BP |
1742 | return retval; |
1743 | case MTNOP: | |
ec0fdb01 | 1744 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1745 | return idetape_flush_tape_buffers(drive); |
1746 | case MTRETEN: | |
ec0fdb01 | 1747 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1748 | return ide_do_start_stop(drive, disk, |
5a04cfa9 | 1749 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1750 | case MTEOM: |
1751 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
2ac07d92 | 1752 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1753 | case MTERASE: |
1754 | (void)idetape_rewind_tape(drive); | |
1755 | idetape_create_erase_cmd(&pc); | |
2ac07d92 | 1756 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1757 | case MTSETBLK: |
1758 | if (mt_count) { | |
1759 | if (mt_count < tape->blk_size || | |
1760 | mt_count % tape->blk_size) | |
1da177e4 | 1761 | return -EIO; |
5a04cfa9 | 1762 | tape->user_bs_factor = mt_count / tape->blk_size; |
f2e3ab52 | 1763 | clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 | 1764 | } else |
f2e3ab52 | 1765 | set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 BP |
1766 | return 0; |
1767 | case MTSEEK: | |
ec0fdb01 | 1768 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1769 | return idetape_position_tape(drive, |
1770 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1771 | case MTSETPART: | |
ec0fdb01 | 1772 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1773 | return idetape_position_tape(drive, 0, mt_count, 0); |
1774 | case MTFSR: | |
1775 | case MTBSR: | |
1776 | case MTLOCK: | |
0578042d | 1777 | retval = ide_set_media_lock(drive, disk, 1); |
5a04cfa9 | 1778 | if (retval) |
1da177e4 | 1779 | return retval; |
5a04cfa9 BP |
1780 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1781 | return 0; | |
1782 | case MTUNLOCK: | |
0578042d | 1783 | retval = ide_set_media_lock(drive, disk, 0); |
5a04cfa9 BP |
1784 | if (retval) |
1785 | return retval; | |
1786 | tape->door_locked = DOOR_UNLOCKED; | |
1787 | return 0; | |
1788 | default: | |
1789 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1790 | mt_op); | |
1791 | return -EIO; | |
1da177e4 LT |
1792 | } |
1793 | } | |
1794 | ||
1795 | /* | |
d99c9da2 BP |
1796 | * Our character device ioctls. General mtio.h magnetic io commands are |
1797 | * supported here, and not in the corresponding block interface. Our own | |
1798 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 1799 | */ |
d99c9da2 BP |
1800 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
1801 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1802 | { |
5aeddf90 | 1803 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 LT |
1804 | ide_drive_t *drive = tape->drive; |
1805 | struct mtop mtop; | |
1806 | struct mtget mtget; | |
1807 | struct mtpos mtpos; | |
54bb2074 | 1808 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
1809 | void __user *argp = (void __user *)arg; |
1810 | ||
8004a8c9 | 1811 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 1812 | |
54abf37e | 1813 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 1814 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1815 | idetape_flush_tape_buffers(drive); |
1816 | } | |
1817 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
01a63aeb | 1818 | block_offset = tape->merge_bh_size / |
54bb2074 | 1819 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
1820 | position = idetape_read_position(drive); |
1821 | if (position < 0) | |
1da177e4 LT |
1822 | return -EIO; |
1823 | } | |
1824 | switch (cmd) { | |
5a04cfa9 BP |
1825 | case MTIOCTOP: |
1826 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
1827 | return -EFAULT; | |
1828 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
1829 | case MTIOCGET: | |
1830 | memset(&mtget, 0, sizeof(struct mtget)); | |
1831 | mtget.mt_type = MT_ISSCSI2; | |
1832 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1833 | mtget.mt_dsreg = | |
1834 | ((tape->blk_size * tape->user_bs_factor) | |
1835 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
1836 | ||
1837 | if (tape->drv_write_prot) | |
1838 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
1839 | ||
1840 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
1841 | return -EFAULT; | |
1842 | return 0; | |
1843 | case MTIOCPOS: | |
1844 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1845 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
1846 | return -EFAULT; | |
1847 | return 0; | |
1848 | default: | |
1849 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1850 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 1851 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
1852 | } |
1853 | } | |
1854 | ||
3cffb9ce BP |
1855 | /* |
1856 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
1857 | * block size with the reported value. | |
1858 | */ | |
1859 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
1860 | { | |
1861 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1862 | struct ide_atapi_pc pc; |
3cffb9ce BP |
1863 | |
1864 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2ac07d92 | 1865 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
3cffb9ce | 1866 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
54bb2074 | 1867 | if (tape->blk_size == 0) { |
3cffb9ce BP |
1868 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
1869 | "block size, assuming 32k\n"); | |
54bb2074 | 1870 | tape->blk_size = 32768; |
3cffb9ce BP |
1871 | } |
1872 | return; | |
1873 | } | |
d236d74c BP |
1874 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
1875 | (pc.buf[4 + 6] << 8) + | |
1876 | pc.buf[4 + 7]; | |
1877 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 1878 | } |
1da177e4 | 1879 | |
5a04cfa9 | 1880 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
1881 | { |
1882 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
1883 | ide_drive_t *drive; | |
1884 | idetape_tape_t *tape; | |
1da177e4 LT |
1885 | int retval; |
1886 | ||
8004a8c9 BP |
1887 | if (i >= MAX_HWIFS * MAX_DRIVES) |
1888 | return -ENXIO; | |
1889 | ||
04f4ac9d | 1890 | lock_kernel(); |
8004a8c9 | 1891 | tape = ide_tape_chrdev_get(i); |
04f4ac9d JC |
1892 | if (!tape) { |
1893 | unlock_kernel(); | |
8004a8c9 | 1894 | return -ENXIO; |
04f4ac9d | 1895 | } |
8004a8c9 BP |
1896 | |
1897 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1898 | ||
1da177e4 LT |
1899 | /* |
1900 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1901 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1902 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1903 | */ | |
1904 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1905 | ||
1da177e4 LT |
1906 | drive = tape->drive; |
1907 | ||
1908 | filp->private_data = tape; | |
1909 | ||
f2e3ab52 | 1910 | if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { |
1da177e4 LT |
1911 | retval = -EBUSY; |
1912 | goto out_put_tape; | |
1913 | } | |
1914 | ||
1915 | retval = idetape_wait_ready(drive, 60 * HZ); | |
1916 | if (retval) { | |
f2e3ab52 | 1917 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1918 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
1919 | goto out_put_tape; | |
1920 | } | |
1921 | ||
1922 | idetape_read_position(drive); | |
f2e3ab52 | 1923 | if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) |
1da177e4 LT |
1924 | (void)idetape_rewind_tape(drive); |
1925 | ||
1da177e4 | 1926 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 1927 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
1928 | |
1929 | /* Set write protect flag if device is opened as read-only. */ | |
1930 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
1931 | tape->write_prot = 1; | |
1932 | else | |
1933 | tape->write_prot = tape->drv_write_prot; | |
1934 | ||
1935 | /* Make sure drive isn't write protected if user wants to write. */ | |
1936 | if (tape->write_prot) { | |
1937 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
1938 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
f2e3ab52 | 1939 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1940 | retval = -EROFS; |
1941 | goto out_put_tape; | |
1942 | } | |
1943 | } | |
1944 | ||
3c98bf34 | 1945 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 1946 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
0578042d | 1947 | if (!ide_set_media_lock(drive, tape->disk, 1)) { |
385a4b87 BZ |
1948 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
1949 | tape->door_locked = DOOR_LOCKED; | |
1da177e4 LT |
1950 | } |
1951 | } | |
04f4ac9d | 1952 | unlock_kernel(); |
1da177e4 LT |
1953 | return 0; |
1954 | ||
1955 | out_put_tape: | |
1956 | ide_tape_put(tape); | |
04f4ac9d | 1957 | unlock_kernel(); |
1da177e4 LT |
1958 | return retval; |
1959 | } | |
1960 | ||
5a04cfa9 | 1961 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
1962 | { |
1963 | idetape_tape_t *tape = drive->driver_data; | |
1964 | ||
d9df937a | 1965 | ide_tape_flush_merge_buffer(drive); |
077e3bdb BP |
1966 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); |
1967 | if (tape->merge_bh != NULL) { | |
54bb2074 BP |
1968 | idetape_pad_zeros(drive, tape->blk_size * |
1969 | (tape->user_bs_factor - 1)); | |
077e3bdb BP |
1970 | ide_tape_kfree_buffer(tape); |
1971 | tape->merge_bh = NULL; | |
1da177e4 LT |
1972 | } |
1973 | idetape_write_filemark(drive); | |
1974 | idetape_flush_tape_buffers(drive); | |
1975 | idetape_flush_tape_buffers(drive); | |
1976 | } | |
1977 | ||
5a04cfa9 | 1978 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 | 1979 | { |
5aeddf90 | 1980 | struct ide_tape_obj *tape = filp->private_data; |
1da177e4 | 1981 | ide_drive_t *drive = tape->drive; |
1da177e4 LT |
1982 | unsigned int minor = iminor(inode); |
1983 | ||
1984 | lock_kernel(); | |
1985 | tape = drive->driver_data; | |
8004a8c9 BP |
1986 | |
1987 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 1988 | |
54abf37e | 1989 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 1990 | idetape_write_release(drive, minor); |
54abf37e | 1991 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 1992 | if (minor < 128) |
ec0fdb01 | 1993 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 1994 | } |
f64eee7b | 1995 | |
f2e3ab52 | 1996 | if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) |
1da177e4 | 1997 | (void) idetape_rewind_tape(drive); |
54abf37e | 1998 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 | 1999 | if (tape->door_locked == DOOR_LOCKED) { |
0578042d | 2000 | if (!ide_set_media_lock(drive, tape->disk, 0)) |
385a4b87 | 2001 | tape->door_locked = DOOR_UNLOCKED; |
1da177e4 LT |
2002 | } |
2003 | } | |
f2e3ab52 | 2004 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2005 | ide_tape_put(tape); |
2006 | unlock_kernel(); | |
2007 | return 0; | |
2008 | } | |
2009 | ||
6d29c8f0 | 2010 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 2011 | { |
1da177e4 | 2012 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 2013 | struct ide_atapi_pc pc; |
41fa9f86 | 2014 | u8 pc_buf[256]; |
801bd32e | 2015 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 2016 | |
1da177e4 | 2017 | idetape_create_inquiry_cmd(&pc); |
41fa9f86 BZ |
2018 | pc.buf = &pc_buf[0]; |
2019 | pc.buf_size = sizeof(pc_buf); | |
2020 | ||
2ac07d92 | 2021 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
6d29c8f0 BP |
2022 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
2023 | tape->name); | |
1da177e4 LT |
2024 | return; |
2025 | } | |
d236d74c BP |
2026 | memcpy(vendor_id, &pc.buf[8], 8); |
2027 | memcpy(product_id, &pc.buf[16], 16); | |
2028 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 | 2029 | |
801bd32e BP |
2030 | ide_fixstring(vendor_id, 8, 0); |
2031 | ide_fixstring(product_id, 16, 0); | |
2032 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 2033 | |
801bd32e | 2034 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 2035 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
2036 | } |
2037 | ||
2038 | /* | |
b6422013 BP |
2039 | * Ask the tape about its various parameters. In particular, we will adjust our |
2040 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 2041 | */ |
5a04cfa9 | 2042 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
2043 | { |
2044 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2045 | struct ide_atapi_pc pc; |
b6422013 BP |
2046 | u8 *caps; |
2047 | u8 speed, max_speed; | |
47314fa4 | 2048 | |
1da177e4 | 2049 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2ac07d92 | 2050 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
b6422013 BP |
2051 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
2052 | " some default values\n"); | |
54bb2074 | 2053 | tape->blk_size = 512; |
b6422013 BP |
2054 | put_unaligned(52, (u16 *)&tape->caps[12]); |
2055 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2056 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
2057 | return; |
2058 | } | |
d236d74c | 2059 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
2060 | |
2061 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
2062 | speed = be16_to_cpup((__be16 *)&caps[14]); |
2063 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 2064 | |
cd740ab0 HH |
2065 | *(u16 *)&caps[8] = max_speed; |
2066 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
2067 | *(u16 *)&caps[14] = speed; | |
2068 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 2069 | |
b6422013 BP |
2070 | if (!speed) { |
2071 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2072 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2073 | *(u16 *)&caps[14] = 650; |
1da177e4 | 2074 | } |
b6422013 BP |
2075 | if (!max_speed) { |
2076 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2077 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2078 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
2079 | } |
2080 | ||
b6422013 | 2081 | memcpy(&tape->caps, caps, 20); |
0578042d BZ |
2082 | |
2083 | /* device lacks locking support according to capabilities page */ | |
2084 | if ((caps[6] & 1) == 0) | |
42619d35 | 2085 | drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; |
0578042d | 2086 | |
b6422013 | 2087 | if (caps[7] & 0x02) |
54bb2074 | 2088 | tape->blk_size = 512; |
b6422013 | 2089 | else if (caps[7] & 0x04) |
54bb2074 | 2090 | tape->blk_size = 1024; |
1da177e4 LT |
2091 | } |
2092 | ||
7662d046 | 2093 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
2094 | #define ide_tape_devset_get(name, field) \ |
2095 | static int get_##name(ide_drive_t *drive) \ | |
2096 | { \ | |
2097 | idetape_tape_t *tape = drive->driver_data; \ | |
2098 | return tape->field; \ | |
2099 | } | |
2100 | ||
2101 | #define ide_tape_devset_set(name, field) \ | |
2102 | static int set_##name(ide_drive_t *drive, int arg) \ | |
2103 | { \ | |
2104 | idetape_tape_t *tape = drive->driver_data; \ | |
2105 | tape->field = arg; \ | |
2106 | return 0; \ | |
2107 | } | |
2108 | ||
92f1f8fd | 2109 | #define ide_tape_devset_rw_field(_name, _field) \ |
8185d5aa BZ |
2110 | ide_tape_devset_get(_name, _field) \ |
2111 | ide_tape_devset_set(_name, _field) \ | |
92f1f8fd | 2112 | IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) |
8185d5aa | 2113 | |
92f1f8fd | 2114 | #define ide_tape_devset_r_field(_name, _field) \ |
8185d5aa | 2115 | ide_tape_devset_get(_name, _field) \ |
92f1f8fd | 2116 | IDE_DEVSET(_name, 0, get_##_name, NULL) |
8185d5aa BZ |
2117 | |
2118 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
2119 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
2120 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
2121 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
2122 | ||
97100fc8 | 2123 | ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); |
92f1f8fd EO |
2124 | |
2125 | ide_tape_devset_rw_field(debug_mask, debug_mask); | |
2126 | ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); | |
2127 | ||
2128 | ide_tape_devset_r_field(avg_speed, avg_speed); | |
2129 | ide_tape_devset_r_field(speed, caps[14]); | |
2130 | ide_tape_devset_r_field(buffer, caps[16]); | |
2131 | ide_tape_devset_r_field(buffer_size, buffer_size); | |
2132 | ||
2133 | static const struct ide_proc_devset idetape_settings[] = { | |
2134 | __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), | |
2135 | __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), | |
2136 | __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), | |
2137 | __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), | |
2138 | __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), | |
2139 | __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), | |
2140 | __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
2141 | mulf_tdsc, divf_tdsc), | |
71bfc7a7 | 2142 | { NULL }, |
8185d5aa | 2143 | }; |
7662d046 | 2144 | #endif |
1da177e4 LT |
2145 | |
2146 | /* | |
3c98bf34 | 2147 | * The function below is called to: |
1da177e4 | 2148 | * |
3c98bf34 BP |
2149 | * 1. Initialize our various state variables. |
2150 | * 2. Ask the tape for its capabilities. | |
2151 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2152 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 2153 | * |
3c98bf34 BP |
2154 | * Note that at this point ide.c already assigned us an irq, so that we can |
2155 | * queue requests here and wait for their completion. | |
1da177e4 | 2156 | */ |
5a04cfa9 | 2157 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 2158 | { |
83042b24 | 2159 | unsigned long t; |
1da177e4 | 2160 | int speed; |
f73850a3 | 2161 | int buffer_size; |
b6422013 | 2162 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 2163 | |
85e39035 BZ |
2164 | drive->pc_callback = ide_tape_callback; |
2165 | drive->pc_update_buffers = idetape_update_buffers; | |
2166 | drive->pc_io_buffers = ide_tape_io_buffers; | |
776bb027 | 2167 | |
97100fc8 BZ |
2168 | drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; |
2169 | ||
4166c199 BZ |
2170 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
2171 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2172 | tape->name); | |
97100fc8 | 2173 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 2174 | } |
97100fc8 | 2175 | |
1da177e4 | 2176 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 2177 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
97100fc8 BZ |
2178 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
2179 | ||
1da177e4 LT |
2180 | tape->minor = minor; |
2181 | tape->name[0] = 'h'; | |
2182 | tape->name[1] = 't'; | |
2183 | tape->name[2] = '0' + minor; | |
54abf37e | 2184 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
4dde4492 | 2185 | |
1da177e4 LT |
2186 | idetape_get_inquiry_results(drive); |
2187 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 2188 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 2189 | tape->user_bs_factor = 1; |
f73850a3 BP |
2190 | tape->buffer_size = *ctl * tape->blk_size; |
2191 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 2192 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 2193 | *ctl /= 2; |
f73850a3 | 2194 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 2195 | } |
f73850a3 | 2196 | buffer_size = tape->buffer_size; |
a997a435 | 2197 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
f73850a3 | 2198 | if (buffer_size % PAGE_SIZE) { |
a997a435 | 2199 | tape->pages_per_buffer++; |
f73850a3 | 2200 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
1da177e4 LT |
2201 | } |
2202 | ||
83042b24 | 2203 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 2204 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 2205 | |
f73850a3 | 2206 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
2207 | |
2208 | /* | |
3c98bf34 BP |
2209 | * Ensure that the number we got makes sense; limit it within |
2210 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 2211 | */ |
a792bd5a HH |
2212 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
2213 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 2214 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 2215 | "%lums tDSC%s\n", |
b6422013 | 2216 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
2217 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
2218 | tape->buffer_size / 1024, | |
54bb2074 | 2219 | tape->best_dsc_rw_freq * 1000 / HZ, |
97100fc8 | 2220 | (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); |
1da177e4 | 2221 | |
1e874f44 | 2222 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
2223 | } |
2224 | ||
4031bbe4 | 2225 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
2226 | { |
2227 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 2228 | |
7662d046 | 2229 | ide_proc_unregister_driver(drive, tape->driver); |
8fed4368 | 2230 | device_del(&tape->dev); |
1da177e4 LT |
2231 | ide_unregister_region(tape->disk); |
2232 | ||
8fed4368 BZ |
2233 | mutex_lock(&idetape_ref_mutex); |
2234 | put_device(&tape->dev); | |
2235 | mutex_unlock(&idetape_ref_mutex); | |
1da177e4 LT |
2236 | } |
2237 | ||
8fed4368 | 2238 | static void ide_tape_release(struct device *dev) |
1da177e4 | 2239 | { |
8fed4368 | 2240 | struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); |
1da177e4 LT |
2241 | ide_drive_t *drive = tape->drive; |
2242 | struct gendisk *g = tape->disk; | |
2243 | ||
01a63aeb | 2244 | BUG_ON(tape->merge_bh_size); |
8604affd | 2245 | |
97100fc8 | 2246 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 2247 | drive->driver_data = NULL; |
dbc1272e | 2248 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
2249 | device_destroy(idetape_sysfs_class, |
2250 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
2251 | idetape_devs[tape->minor] = NULL; |
2252 | g->private_data = NULL; | |
2253 | put_disk(g); | |
2254 | kfree(tape); | |
2255 | } | |
2256 | ||
ecfd80e4 | 2257 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
2258 | static int proc_idetape_read_name |
2259 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2260 | { | |
2261 | ide_drive_t *drive = (ide_drive_t *) data; | |
2262 | idetape_tape_t *tape = drive->driver_data; | |
2263 | char *out = page; | |
2264 | int len; | |
2265 | ||
2266 | len = sprintf(out, "%s\n", tape->name); | |
2267 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2268 | } | |
2269 | ||
2270 | static ide_proc_entry_t idetape_proc[] = { | |
2271 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2272 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2273 | { NULL, 0, NULL, NULL } | |
2274 | }; | |
79cb3803 BZ |
2275 | |
2276 | static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) | |
2277 | { | |
2278 | return idetape_proc; | |
2279 | } | |
2280 | ||
2281 | static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) | |
2282 | { | |
2283 | return idetape_settings; | |
2284 | } | |
1da177e4 LT |
2285 | #endif |
2286 | ||
4031bbe4 | 2287 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 2288 | |
7f3c868b | 2289 | static struct ide_driver idetape_driver = { |
8604affd | 2290 | .gen_driver = { |
4ef3b8f4 | 2291 | .owner = THIS_MODULE, |
8604affd BZ |
2292 | .name = "ide-tape", |
2293 | .bus = &ide_bus_type, | |
8604affd | 2294 | }, |
4031bbe4 RK |
2295 | .probe = ide_tape_probe, |
2296 | .remove = ide_tape_remove, | |
1da177e4 | 2297 | .version = IDETAPE_VERSION, |
1da177e4 | 2298 | .do_request = idetape_do_request, |
7662d046 | 2299 | #ifdef CONFIG_IDE_PROC_FS |
79cb3803 BZ |
2300 | .proc_entries = ide_tape_proc_entries, |
2301 | .proc_devsets = ide_tape_proc_devsets, | |
7662d046 | 2302 | #endif |
1da177e4 LT |
2303 | }; |
2304 | ||
3c98bf34 | 2305 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 2306 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
2307 | .owner = THIS_MODULE, |
2308 | .read = idetape_chrdev_read, | |
2309 | .write = idetape_chrdev_write, | |
2310 | .ioctl = idetape_chrdev_ioctl, | |
2311 | .open = idetape_chrdev_open, | |
2312 | .release = idetape_chrdev_release, | |
2313 | }; | |
2314 | ||
a4600f81 | 2315 | static int idetape_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 2316 | { |
a4600f81 | 2317 | struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk); |
1da177e4 | 2318 | |
5a04cfa9 | 2319 | if (!tape) |
1da177e4 LT |
2320 | return -ENXIO; |
2321 | ||
1da177e4 LT |
2322 | return 0; |
2323 | } | |
2324 | ||
a4600f81 | 2325 | static int idetape_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2326 | { |
5aeddf90 | 2327 | struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); |
1da177e4 LT |
2328 | |
2329 | ide_tape_put(tape); | |
1da177e4 LT |
2330 | return 0; |
2331 | } | |
2332 | ||
a4600f81 | 2333 | static int idetape_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
2334 | unsigned int cmd, unsigned long arg) |
2335 | { | |
5aeddf90 | 2336 | struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); |
1da177e4 | 2337 | ide_drive_t *drive = tape->drive; |
1bddd9e6 | 2338 | int err = generic_ide_ioctl(drive, bdev, cmd, arg); |
1da177e4 LT |
2339 | if (err == -EINVAL) |
2340 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2341 | return err; | |
2342 | } | |
2343 | ||
2344 | static struct block_device_operations idetape_block_ops = { | |
2345 | .owner = THIS_MODULE, | |
a4600f81 AV |
2346 | .open = idetape_open, |
2347 | .release = idetape_release, | |
2348 | .locked_ioctl = idetape_ioctl, | |
1da177e4 LT |
2349 | }; |
2350 | ||
4031bbe4 | 2351 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2352 | { |
2353 | idetape_tape_t *tape; | |
2354 | struct gendisk *g; | |
2355 | int minor; | |
2356 | ||
2357 | if (!strstr("ide-tape", drive->driver_req)) | |
2358 | goto failed; | |
2a924662 | 2359 | |
1da177e4 LT |
2360 | if (drive->media != ide_tape) |
2361 | goto failed; | |
2a924662 | 2362 | |
97100fc8 BZ |
2363 | if ((drive->dev_flags & IDE_DFLAG_ID_READ) && |
2364 | ide_check_atapi_device(drive, DRV_NAME) == 0) { | |
5a04cfa9 BP |
2365 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
2366 | " the driver\n", drive->name); | |
1da177e4 LT |
2367 | goto failed; |
2368 | } | |
5a04cfa9 | 2369 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2370 | if (tape == NULL) { |
5a04cfa9 BP |
2371 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2372 | drive->name); | |
1da177e4 LT |
2373 | goto failed; |
2374 | } | |
2375 | ||
2376 | g = alloc_disk(1 << PARTN_BITS); | |
2377 | if (!g) | |
2378 | goto out_free_tape; | |
2379 | ||
2380 | ide_init_disk(g, drive); | |
2381 | ||
8fed4368 BZ |
2382 | tape->dev.parent = &drive->gendev; |
2383 | tape->dev.release = ide_tape_release; | |
2384 | dev_set_name(&tape->dev, dev_name(&drive->gendev)); | |
2385 | ||
2386 | if (device_register(&tape->dev)) | |
2387 | goto out_free_disk; | |
1da177e4 LT |
2388 | |
2389 | tape->drive = drive; | |
2390 | tape->driver = &idetape_driver; | |
2391 | tape->disk = g; | |
2392 | ||
2393 | g->private_data = &tape->driver; | |
2394 | ||
2395 | drive->driver_data = tape; | |
2396 | ||
cf8b8975 | 2397 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2398 | for (minor = 0; idetape_devs[minor]; minor++) |
2399 | ; | |
2400 | idetape_devs[minor] = tape; | |
cf8b8975 | 2401 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2402 | |
2403 | idetape_setup(drive, tape, minor); | |
2404 | ||
3ee074bf GKH |
2405 | device_create(idetape_sysfs_class, &drive->gendev, |
2406 | MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); | |
2407 | device_create(idetape_sysfs_class, &drive->gendev, | |
2408 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
2409 | "n%s", tape->name); | |
d5dee80a | 2410 | |
1da177e4 LT |
2411 | g->fops = &idetape_block_ops; |
2412 | ide_register_region(g); | |
2413 | ||
2414 | return 0; | |
8604affd | 2415 | |
8fed4368 BZ |
2416 | out_free_disk: |
2417 | put_disk(g); | |
1da177e4 LT |
2418 | out_free_tape: |
2419 | kfree(tape); | |
2420 | failed: | |
8604affd | 2421 | return -ENODEV; |
1da177e4 LT |
2422 | } |
2423 | ||
5a04cfa9 | 2424 | static void __exit idetape_exit(void) |
1da177e4 | 2425 | { |
8604affd | 2426 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2427 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2428 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2429 | } | |
2430 | ||
17514e8a | 2431 | static int __init idetape_init(void) |
1da177e4 | 2432 | { |
d5dee80a WD |
2433 | int error = 1; |
2434 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2435 | if (IS_ERR(idetape_sysfs_class)) { | |
2436 | idetape_sysfs_class = NULL; | |
2437 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2438 | error = -EBUSY; | |
2439 | goto out; | |
2440 | } | |
2441 | ||
1da177e4 | 2442 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2443 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2444 | " interface\n"); | |
d5dee80a WD |
2445 | error = -EBUSY; |
2446 | goto out_free_class; | |
1da177e4 | 2447 | } |
d5dee80a WD |
2448 | |
2449 | error = driver_register(&idetape_driver.gen_driver); | |
2450 | if (error) | |
2451 | goto out_free_driver; | |
2452 | ||
2453 | return 0; | |
2454 | ||
2455 | out_free_driver: | |
2456 | driver_unregister(&idetape_driver.gen_driver); | |
2457 | out_free_class: | |
2458 | class_destroy(idetape_sysfs_class); | |
2459 | out: | |
2460 | return error; | |
1da177e4 LT |
2461 | } |
2462 | ||
263756ec | 2463 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2464 | module_init(idetape_init); |
2465 | module_exit(idetape_exit); | |
2466 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2467 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2468 | MODULE_LICENSE("GPL"); |