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 | ||
d236d74c | 300 | static void 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) { | |
1da177e4 LT |
307 | if (bh == NULL) { |
308 | printk(KERN_ERR "ide-tape: bh == NULL in " | |
309 | "idetape_input_buffers\n"); | |
9f87abe8 | 310 | ide_pad_transfer(drive, 0, bcount); |
1da177e4 LT |
311 | return; |
312 | } | |
5a04cfa9 BP |
313 | count = min( |
314 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
315 | bcount); | |
374e042c | 316 | drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data + |
5a04cfa9 | 317 | atomic_read(&bh->b_count), count); |
1da177e4 LT |
318 | bcount -= count; |
319 | atomic_add(count, &bh->b_count); | |
320 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
321 | bh = bh->b_reqnext; | |
322 | if (bh) | |
323 | atomic_set(&bh->b_count, 0); | |
324 | } | |
325 | } | |
326 | pc->bh = bh; | |
327 | } | |
328 | ||
d236d74c | 329 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 330 | unsigned int bcount) |
1da177e4 LT |
331 | { |
332 | struct idetape_bh *bh = pc->bh; | |
333 | int count; | |
334 | ||
335 | while (bcount) { | |
1da177e4 | 336 | if (bh == NULL) { |
5a04cfa9 BP |
337 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
338 | __func__); | |
1da177e4 LT |
339 | return; |
340 | } | |
1da177e4 | 341 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
374e042c | 342 | drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); |
1da177e4 LT |
343 | bcount -= count; |
344 | pc->b_data += count; | |
345 | pc->b_count -= count; | |
346 | if (!pc->b_count) { | |
5a04cfa9 BP |
347 | bh = bh->b_reqnext; |
348 | pc->bh = bh; | |
1da177e4 LT |
349 | if (bh) { |
350 | pc->b_data = bh->b_data; | |
351 | pc->b_count = atomic_read(&bh->b_count); | |
352 | } | |
353 | } | |
354 | } | |
355 | } | |
356 | ||
646c0cb6 | 357 | static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
358 | { |
359 | struct idetape_bh *bh = pc->bh; | |
360 | int count; | |
d236d74c | 361 | unsigned int bcount = pc->xferred; |
1da177e4 | 362 | |
346331f8 | 363 | if (pc->flags & PC_FLAG_WRITING) |
1da177e4 LT |
364 | return; |
365 | while (bcount) { | |
1da177e4 | 366 | if (bh == NULL) { |
5a04cfa9 BP |
367 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
368 | __func__); | |
1da177e4 LT |
369 | return; |
370 | } | |
1da177e4 LT |
371 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
372 | atomic_set(&bh->b_count, count); | |
373 | if (atomic_read(&bh->b_count) == bh->b_size) | |
374 | bh = bh->b_reqnext; | |
375 | bcount -= count; | |
376 | } | |
377 | pc->bh = bh; | |
378 | } | |
379 | ||
1da177e4 | 380 | /* |
1b5db434 BP |
381 | * called on each failed packet command retry to analyze the request sense. We |
382 | * currently do not utilize this information. | |
1da177e4 | 383 | */ |
1b5db434 | 384 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
385 | { |
386 | idetape_tape_t *tape = drive->driver_data; | |
5e2040fd | 387 | struct ide_atapi_pc *pc = drive->failed_pc; |
1da177e4 | 388 | |
1b5db434 BP |
389 | tape->sense_key = sense[2] & 0xF; |
390 | tape->asc = sense[12]; | |
391 | tape->ascq = sense[13]; | |
8004a8c9 BP |
392 | |
393 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
394 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 395 | |
d236d74c | 396 | /* Correct pc->xferred by asking the tape. */ |
346331f8 | 397 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
d236d74c | 398 | pc->xferred = pc->req_xfer - |
54bb2074 | 399 | tape->blk_size * |
5d0cc8ae | 400 | get_unaligned_be32(&sense[3]); |
646c0cb6 | 401 | idetape_update_buffers(drive, pc); |
1da177e4 LT |
402 | } |
403 | ||
404 | /* | |
405 | * If error was the result of a zero-length read or write command, | |
406 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
407 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
408 | */ | |
90699ce2 | 409 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
410 | /* length == 0 */ |
411 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
412 | if (tape->sense_key == 5) { | |
1da177e4 LT |
413 | /* don't report an error, everything's ok */ |
414 | pc->error = 0; | |
415 | /* don't retry read/write */ | |
346331f8 | 416 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
417 | } |
418 | } | |
90699ce2 | 419 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
c152cc1a | 420 | pc->error = IDE_DRV_ERROR_FILEMARK; |
346331f8 | 421 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 422 | } |
90699ce2 | 423 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
424 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
425 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
c152cc1a | 426 | pc->error = IDE_DRV_ERROR_EOD; |
346331f8 | 427 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
428 | } |
429 | } | |
90699ce2 | 430 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 431 | if (tape->sense_key == 8) { |
c152cc1a | 432 | pc->error = IDE_DRV_ERROR_EOD; |
346331f8 | 433 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 434 | } |
346331f8 | 435 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 436 | pc->xferred) |
1da177e4 LT |
437 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
438 | } | |
439 | } | |
440 | ||
d01dbc3b | 441 | /* Free data buffers completely. */ |
077e3bdb | 442 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) |
1da177e4 | 443 | { |
077e3bdb | 444 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; |
d01dbc3b BP |
445 | |
446 | while (bh) { | |
447 | u32 size = bh->b_size; | |
448 | ||
449 | while (size) { | |
450 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
451 | ||
452 | if (bh->b_data) | |
453 | free_pages((unsigned long)bh->b_data, order); | |
454 | ||
455 | size &= (order-1); | |
456 | bh->b_data += (1 << order) * PAGE_SIZE; | |
1da177e4 LT |
457 | } |
458 | prev_bh = bh; | |
459 | bh = bh->b_reqnext; | |
460 | kfree(prev_bh); | |
461 | } | |
1da177e4 LT |
462 | } |
463 | ||
b14c7212 BZ |
464 | static void ide_tape_handle_dsc(ide_drive_t *); |
465 | ||
03a2faae | 466 | static int ide_tape_callback(ide_drive_t *drive, int dsc) |
1da177e4 LT |
467 | { |
468 | idetape_tape_t *tape = drive->driver_data; | |
2b9efba4 | 469 | struct ide_atapi_pc *pc = drive->pc; |
313afea7 | 470 | struct request *rq = drive->hwif->rq; |
5985e6ab | 471 | int uptodate = pc->error ? 0 : 1; |
313afea7 | 472 | int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; |
1da177e4 | 473 | |
8004a8c9 BP |
474 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
475 | ||
b14c7212 BZ |
476 | if (dsc) |
477 | ide_tape_handle_dsc(drive); | |
478 | ||
5e2040fd BZ |
479 | if (drive->failed_pc == pc) |
480 | drive->failed_pc = NULL; | |
dd2e9a03 | 481 | |
5985e6ab BZ |
482 | if (pc->c[0] == REQUEST_SENSE) { |
483 | if (uptodate) | |
484 | idetape_analyze_error(drive, pc->buf); | |
485 | else | |
486 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
487 | "itself - Aborting request!\n"); | |
488 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
5985e6ab BZ |
489 | int blocks = pc->xferred / tape->blk_size; |
490 | ||
491 | tape->avg_size += blocks * tape->blk_size; | |
492 | ||
493 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
494 | tape->avg_speed = tape->avg_size * HZ / | |
495 | (jiffies - tape->avg_time) / 1024; | |
496 | tape->avg_size = 0; | |
497 | tape->avg_time = jiffies; | |
498 | } | |
499 | ||
500 | tape->first_frame += blocks; | |
501 | rq->current_nr_sectors -= blocks; | |
502 | ||
313afea7 BZ |
503 | if (pc->error) { |
504 | uptodate = 0; | |
505 | err = pc->error; | |
506 | } | |
5985e6ab | 507 | } else if (pc->c[0] == READ_POSITION && uptodate) { |
2b9efba4 | 508 | u8 *readpos = pc->buf; |
5985e6ab BZ |
509 | |
510 | debug_log(DBG_SENSE, "BOP - %s\n", | |
511 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
512 | debug_log(DBG_SENSE, "EOP - %s\n", | |
513 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
514 | ||
515 | if (readpos[0] & 0x4) { | |
516 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
517 | "to the tape\n"); | |
f2e3ab52 | 518 | clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 519 | uptodate = 0; |
313afea7 | 520 | err = IDE_DRV_ERROR_GENERAL; |
5985e6ab BZ |
521 | } else { |
522 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
cd740ab0 | 523 | be32_to_cpup((__be32 *)&readpos[4])); |
5985e6ab BZ |
524 | |
525 | tape->partition = readpos[1]; | |
cd740ab0 | 526 | tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); |
f2e3ab52 | 527 | set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 528 | } |
1da177e4 | 529 | } |
5985e6ab | 530 | |
313afea7 BZ |
531 | rq->errors = err; |
532 | ||
03a2faae | 533 | return uptodate; |
1da177e4 LT |
534 | } |
535 | ||
1da177e4 | 536 | /* |
3c98bf34 | 537 | * Postpone the current request so that ide.c will be able to service requests |
b65fac32 | 538 | * from another device on the same port while we are polling for DSC. |
1da177e4 | 539 | */ |
5a04cfa9 | 540 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
541 | { |
542 | idetape_tape_t *tape = drive->driver_data; | |
543 | ||
8004a8c9 BP |
544 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
545 | ||
b65fac32 BZ |
546 | tape->postponed_rq = drive->hwif->rq; |
547 | ||
54bb2074 | 548 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
549 | } |
550 | ||
74e63e74 BZ |
551 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
552 | { | |
553 | idetape_tape_t *tape = drive->driver_data; | |
554 | ||
555 | /* Media access command */ | |
556 | tape->dsc_polling_start = jiffies; | |
557 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
558 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
559 | /* Allow ide.c to handle other requests */ | |
560 | idetape_postpone_request(drive); | |
561 | } | |
562 | ||
acaa0f5f | 563 | static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
08424ac2 BZ |
564 | unsigned int bcount, int write) |
565 | { | |
566 | if (write) | |
567 | idetape_output_buffers(drive, pc, bcount); | |
568 | else | |
569 | idetape_input_buffers(drive, pc, bcount); | |
acaa0f5f BZ |
570 | |
571 | return bcount; | |
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 | * |
3c98bf34 | 583 | * 1. idetape_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 | |
d236d74c BP |
611 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
612 | struct ide_atapi_pc *pc) | |
1da177e4 | 613 | { |
1da177e4 | 614 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 615 | |
2b9efba4 | 616 | if (drive->pc->c[0] == REQUEST_SENSE && |
90699ce2 | 617 | pc->c[0] == REQUEST_SENSE) { |
1da177e4 LT |
618 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
619 | "Two request sense in serial were issued\n"); | |
620 | } | |
1da177e4 | 621 | |
5e2040fd BZ |
622 | if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
623 | drive->failed_pc = pc; | |
2b9efba4 | 624 | |
1da177e4 | 625 | /* Set the current packet command */ |
2b9efba4 | 626 | drive->pc = pc; |
1da177e4 LT |
627 | |
628 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 629 | (pc->flags & PC_FLAG_ABORT)) { |
1da177e4 | 630 | /* |
3c98bf34 BP |
631 | * We will "abort" retrying a packet command in case legitimate |
632 | * error code was received (crossing a filemark, or end of the | |
633 | * media, for example). | |
1da177e4 | 634 | */ |
346331f8 | 635 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 636 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
637 | tape->sense_key == 2 && tape->asc == 4 && |
638 | (tape->ascq == 1 || tape->ascq == 8))) { | |
639 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
640 | "pc = %2x, key = %2x, " | |
641 | "asc = %2x, ascq = %2x\n", | |
642 | tape->name, pc->c[0], | |
643 | tape->sense_key, tape->asc, | |
644 | tape->ascq); | |
645 | } | |
646 | /* Giving up */ | |
c152cc1a | 647 | pc->error = IDE_DRV_ERROR_GENERAL; |
1da177e4 | 648 | } |
5e2040fd | 649 | drive->failed_pc = NULL; |
b14c7212 | 650 | drive->pc_callback(drive, 0); |
92f5daff | 651 | return ide_stopped; |
1da177e4 | 652 | } |
8004a8c9 | 653 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
654 | |
655 | pc->retries++; | |
1da177e4 | 656 | |
28ad91db | 657 | return ide_issue_pc(drive); |
1da177e4 LT |
658 | } |
659 | ||
3c98bf34 | 660 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 661 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 | 662 | { |
7bf7420a | 663 | ide_init_pc(pc); |
90699ce2 | 664 | pc->c[0] = MODE_SENSE; |
1da177e4 | 665 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
666 | /* DBD = 1 - Don't return block descriptors */ |
667 | pc->c[1] = 8; | |
1da177e4 LT |
668 | pc->c[2] = page_code; |
669 | /* | |
670 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
671 | * | |
672 | * For SCSI this byte is defined as subpage instead of high byte | |
673 | * of length and some IDE drives seem to interpret it this way | |
674 | * and return an error when 255 is used. | |
675 | */ | |
676 | pc->c[3] = 0; | |
3c98bf34 BP |
677 | /* We will just discard data in that case */ |
678 | pc->c[4] = 255; | |
1da177e4 | 679 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 680 | pc->req_xfer = 12; |
1da177e4 | 681 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 682 | pc->req_xfer = 24; |
1da177e4 | 683 | else |
d236d74c | 684 | pc->req_xfer = 50; |
1da177e4 LT |
685 | } |
686 | ||
5a04cfa9 | 687 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 688 | { |
b73c7ee2 | 689 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 690 | idetape_tape_t *tape = drive->driver_data; |
2b9efba4 | 691 | struct ide_atapi_pc *pc = drive->pc; |
22c525b9 | 692 | u8 stat; |
1da177e4 | 693 | |
374e042c | 694 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 695 | |
3a7d2484 BZ |
696 | if (stat & ATA_DSC) { |
697 | if (stat & ATA_ERR) { | |
1da177e4 | 698 | /* Error detected */ |
90699ce2 | 699 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
700 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
701 | tape->name); | |
702 | /* Retry operation */ | |
6b0da28b | 703 | ide_retry_pc(drive, tape->disk); |
258ec411 | 704 | return ide_stopped; |
1da177e4 LT |
705 | } |
706 | pc->error = 0; | |
1da177e4 | 707 | } else { |
c152cc1a | 708 | pc->error = IDE_DRV_ERROR_GENERAL; |
5e2040fd | 709 | drive->failed_pc = NULL; |
1da177e4 | 710 | } |
b14c7212 | 711 | drive->pc_callback(drive, 0); |
1da177e4 LT |
712 | return ide_stopped; |
713 | } | |
714 | ||
cd2abbfe | 715 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
716 | struct ide_atapi_pc *pc, struct request *rq, |
717 | u8 opcode) | |
1da177e4 | 718 | { |
0014c75b BP |
719 | struct idetape_bh *bh = (struct idetape_bh *)rq->special; |
720 | unsigned int length = rq->current_nr_sectors; | |
721 | ||
7bf7420a | 722 | ide_init_pc(pc); |
860ff5ec | 723 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 724 | pc->c[1] = 1; |
1da177e4 | 725 | pc->bh = bh; |
d236d74c BP |
726 | pc->buf = NULL; |
727 | pc->buf_size = length * tape->blk_size; | |
728 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 729 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 730 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 731 | |
cd2abbfe BP |
732 | if (opcode == READ_6) { |
733 | pc->c[0] = READ_6; | |
734 | atomic_set(&bh->b_count, 0); | |
735 | } else if (opcode == WRITE_6) { | |
736 | pc->c[0] = WRITE_6; | |
737 | pc->flags |= PC_FLAG_WRITING; | |
738 | pc->b_data = bh->b_data; | |
739 | pc->b_count = atomic_read(&bh->b_count); | |
740 | } | |
0014c75b BP |
741 | |
742 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
743 | } |
744 | ||
1da177e4 LT |
745 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
746 | struct request *rq, sector_t block) | |
747 | { | |
b73c7ee2 | 748 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 749 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 750 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 751 | struct request *postponed_rq = tape->postponed_rq; |
22c525b9 | 752 | u8 stat; |
1da177e4 | 753 | |
730616b2 MW |
754 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu," |
755 | " current_nr_sectors: %u\n", | |
756 | (unsigned long long)rq->sector, rq->nr_sectors, | |
757 | rq->current_nr_sectors); | |
1da177e4 | 758 | |
4aff5e23 | 759 | if (!blk_special_request(rq)) { |
3c98bf34 | 760 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 761 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 762 | "request queue (%d)\n", drive->name, rq->cmd_type); |
89f78b32 BZ |
763 | if (blk_fs_request(rq) == 0 && rq->errors == 0) |
764 | rq->errors = -EIO; | |
1da177e4 LT |
765 | ide_end_request(drive, 0, 0); |
766 | return ide_stopped; | |
767 | } | |
768 | ||
3c98bf34 | 769 | /* Retry a failed packet command */ |
5e2040fd BZ |
770 | if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { |
771 | pc = drive->failed_pc; | |
28c7214b BZ |
772 | goto out; |
773 | } | |
5a04cfa9 | 774 | |
1da177e4 LT |
775 | if (postponed_rq != NULL) |
776 | if (rq != postponed_rq) { | |
777 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
778 | "Two DSC requests were queued\n"); | |
313afea7 | 779 | drive->failed_pc = NULL; |
6902a533 | 780 | rq->errors = 0; |
f974b196 | 781 | ide_complete_rq(drive, 0, blk_rq_bytes(rq)); |
1da177e4 LT |
782 | return ide_stopped; |
783 | } | |
1da177e4 LT |
784 | |
785 | tape->postponed_rq = NULL; | |
786 | ||
787 | /* | |
788 | * If the tape is still busy, postpone our request and service | |
789 | * the other device meanwhile. | |
790 | */ | |
374e042c | 791 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 792 | |
97100fc8 BZ |
793 | if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && |
794 | (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) | |
f2e3ab52 | 795 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 | 796 | |
97100fc8 | 797 | if (drive->dev_flags & IDE_DFLAG_POST_RESET) { |
f2e3ab52 | 798 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
97100fc8 | 799 | drive->dev_flags &= ~IDE_DFLAG_POST_RESET; |
1da177e4 LT |
800 | } |
801 | ||
f2e3ab52 | 802 | if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && |
3a7d2484 | 803 | (stat & ATA_DSC) == 0) { |
1da177e4 LT |
804 | if (postponed_rq == NULL) { |
805 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 806 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
807 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
808 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
809 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
810 | tape->name); | |
83dd5735 | 811 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
812 | idetape_media_access_finished(drive); |
813 | return ide_stopped; | |
814 | } else { | |
815 | return ide_do_reset(drive); | |
816 | } | |
5a04cfa9 BP |
817 | } else if (time_after(jiffies, |
818 | tape->dsc_polling_start + | |
819 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 820 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
821 | idetape_postpone_request(drive); |
822 | return ide_stopped; | |
823 | } | |
83dd5735 | 824 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
2e8a6f89 | 825 | pc = &tape->queued_pc; |
0014c75b | 826 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
827 | goto out; |
828 | } | |
83dd5735 | 829 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
2e8a6f89 | 830 | pc = &tape->queued_pc; |
0014c75b | 831 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
832 | goto out; |
833 | } | |
83dd5735 | 834 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
d236d74c | 835 | pc = (struct ide_atapi_pc *) rq->buffer; |
83dd5735 BP |
836 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
837 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
838 | goto out; |
839 | } | |
83dd5735 | 840 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
841 | idetape_media_access_finished(drive); |
842 | return ide_stopped; | |
843 | } | |
844 | BUG(); | |
28c7214b | 845 | |
f2e3ab52 | 846 | out: |
8d06bfad | 847 | return idetape_issue_pc(drive, pc); |
1da177e4 LT |
848 | } |
849 | ||
1da177e4 | 850 | /* |
41aa1706 | 851 | * The function below uses __get_free_pages to allocate a data buffer of size |
f73850a3 | 852 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
3c98bf34 | 853 | * much as possible. |
1da177e4 | 854 | * |
41aa1706 BP |
855 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
856 | * failure. | |
1da177e4 | 857 | */ |
077e3bdb BP |
858 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, |
859 | int full, int clear) | |
1da177e4 | 860 | { |
077e3bdb | 861 | struct idetape_bh *prev_bh, *bh, *merge_bh; |
a997a435 | 862 | int pages = tape->pages_per_buffer; |
41aa1706 | 863 | unsigned int order, b_allocd; |
1da177e4 LT |
864 | char *b_data = NULL; |
865 | ||
077e3bdb BP |
866 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
867 | bh = merge_bh; | |
1da177e4 LT |
868 | if (bh == NULL) |
869 | goto abort; | |
41aa1706 BP |
870 | |
871 | order = fls(pages) - 1; | |
872 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 873 | if (!bh->b_data) |
1da177e4 | 874 | goto abort; |
41aa1706 BP |
875 | b_allocd = (1 << order) * PAGE_SIZE; |
876 | pages &= (order-1); | |
877 | ||
1da177e4 | 878 | if (clear) |
41aa1706 BP |
879 | memset(bh->b_data, 0, b_allocd); |
880 | bh->b_reqnext = NULL; | |
881 | bh->b_size = b_allocd; | |
1da177e4 LT |
882 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
883 | ||
41aa1706 BP |
884 | while (pages) { |
885 | order = fls(pages) - 1; | |
886 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 887 | if (!b_data) |
1da177e4 | 888 | goto abort; |
41aa1706 BP |
889 | b_allocd = (1 << order) * PAGE_SIZE; |
890 | ||
1da177e4 | 891 | if (clear) |
41aa1706 BP |
892 | memset(b_data, 0, b_allocd); |
893 | ||
894 | /* newly allocated page frames below buffer header or ...*/ | |
895 | if (bh->b_data == b_data + b_allocd) { | |
896 | bh->b_size += b_allocd; | |
897 | bh->b_data -= b_allocd; | |
1da177e4 | 898 | if (full) |
41aa1706 | 899 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
900 | continue; |
901 | } | |
41aa1706 | 902 | /* they are above the header */ |
1da177e4 | 903 | if (b_data == bh->b_data + bh->b_size) { |
41aa1706 | 904 | bh->b_size += b_allocd; |
1da177e4 | 905 | if (full) |
41aa1706 | 906 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
907 | continue; |
908 | } | |
909 | prev_bh = bh; | |
5a04cfa9 BP |
910 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
911 | if (!bh) { | |
41aa1706 | 912 | free_pages((unsigned long) b_data, order); |
1da177e4 LT |
913 | goto abort; |
914 | } | |
915 | bh->b_reqnext = NULL; | |
916 | bh->b_data = b_data; | |
41aa1706 | 917 | bh->b_size = b_allocd; |
1da177e4 LT |
918 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
919 | prev_bh->b_reqnext = bh; | |
41aa1706 BP |
920 | |
921 | pages &= (order-1); | |
1da177e4 | 922 | } |
41aa1706 | 923 | |
1da177e4 LT |
924 | bh->b_size -= tape->excess_bh_size; |
925 | if (full) | |
926 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
077e3bdb | 927 | return merge_bh; |
1da177e4 | 928 | abort: |
077e3bdb | 929 | ide_tape_kfree_buffer(tape); |
1da177e4 LT |
930 | return NULL; |
931 | } | |
932 | ||
5a04cfa9 | 933 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
8646c88f | 934 | const char __user *buf, int n) |
1da177e4 LT |
935 | { |
936 | struct idetape_bh *bh = tape->bh; | |
937 | int count; | |
dcd96379 | 938 | int ret = 0; |
1da177e4 LT |
939 | |
940 | while (n) { | |
1da177e4 | 941 | if (bh == NULL) { |
5a04cfa9 BP |
942 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
943 | __func__); | |
dcd96379 | 944 | return 1; |
1da177e4 | 945 | } |
5a04cfa9 BP |
946 | count = min((unsigned int) |
947 | (bh->b_size - atomic_read(&bh->b_count)), | |
948 | (unsigned int)n); | |
949 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
950 | count)) | |
dcd96379 | 951 | ret = 1; |
1da177e4 LT |
952 | n -= count; |
953 | atomic_add(count, &bh->b_count); | |
954 | buf += count; | |
955 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
956 | bh = bh->b_reqnext; | |
957 | if (bh) | |
958 | atomic_set(&bh->b_count, 0); | |
959 | } | |
960 | } | |
961 | tape->bh = bh; | |
dcd96379 | 962 | return ret; |
1da177e4 LT |
963 | } |
964 | ||
5a04cfa9 | 965 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
99d74e61 | 966 | int n) |
1da177e4 LT |
967 | { |
968 | struct idetape_bh *bh = tape->bh; | |
969 | int count; | |
dcd96379 | 970 | int ret = 0; |
1da177e4 LT |
971 | |
972 | while (n) { | |
1da177e4 | 973 | if (bh == NULL) { |
5a04cfa9 BP |
974 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
975 | __func__); | |
dcd96379 | 976 | return 1; |
1da177e4 | 977 | } |
1da177e4 | 978 | count = min(tape->b_count, n); |
dcd96379 DW |
979 | if (copy_to_user(buf, tape->b_data, count)) |
980 | ret = 1; | |
1da177e4 LT |
981 | n -= count; |
982 | tape->b_data += count; | |
983 | tape->b_count -= count; | |
984 | buf += count; | |
985 | if (!tape->b_count) { | |
5a04cfa9 BP |
986 | bh = bh->b_reqnext; |
987 | tape->bh = bh; | |
1da177e4 LT |
988 | if (bh) { |
989 | tape->b_data = bh->b_data; | |
990 | tape->b_count = atomic_read(&bh->b_count); | |
991 | } | |
992 | } | |
993 | } | |
dcd96379 | 994 | return ret; |
1da177e4 LT |
995 | } |
996 | ||
077e3bdb | 997 | static void idetape_init_merge_buffer(idetape_tape_t *tape) |
1da177e4 | 998 | { |
077e3bdb BP |
999 | struct idetape_bh *bh = tape->merge_bh; |
1000 | tape->bh = tape->merge_bh; | |
5a04cfa9 | 1001 | |
54abf37e | 1002 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 LT |
1003 | atomic_set(&bh->b_count, 0); |
1004 | else { | |
1005 | tape->b_data = bh->b_data; | |
1006 | tape->b_count = atomic_read(&bh->b_count); | |
1007 | } | |
1008 | } | |
1009 | ||
1da177e4 | 1010 | /* |
3c98bf34 BP |
1011 | * Write a filemark if write_filemark=1. Flush the device buffers without |
1012 | * writing a filemark otherwise. | |
1da177e4 | 1013 | */ |
5a04cfa9 | 1014 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 1015 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 | 1016 | { |
7bf7420a | 1017 | ide_init_pc(pc); |
90699ce2 | 1018 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 1019 | pc->c[4] = write_filemark; |
346331f8 | 1020 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1021 | } |
1022 | ||
1da177e4 LT |
1023 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
1024 | { | |
1025 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1026 | struct gendisk *disk = tape->disk; |
1da177e4 LT |
1027 | int load_attempted = 0; |
1028 | ||
3c98bf34 | 1029 | /* Wait for the tape to become ready */ |
f2e3ab52 | 1030 | set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
1da177e4 LT |
1031 | timeout += jiffies; |
1032 | while (time_before(jiffies, timeout)) { | |
de699ad5 | 1033 | if (ide_do_test_unit_ready(drive, disk) == 0) |
1da177e4 LT |
1034 | return 0; |
1035 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
1036 | || (tape->asc == 0x3A)) { |
1037 | /* no media */ | |
1da177e4 LT |
1038 | if (load_attempted) |
1039 | return -ENOMEDIUM; | |
0c8a6c7a | 1040 | ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
1da177e4 LT |
1041 | load_attempted = 1; |
1042 | /* not about to be ready */ | |
1043 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1044 | (tape->ascq == 1 || tape->ascq == 8))) | |
1045 | return -EIO; | |
80ce45fd | 1046 | msleep(100); |
1da177e4 LT |
1047 | } |
1048 | return -EIO; | |
1049 | } | |
1050 | ||
5a04cfa9 | 1051 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 1052 | { |
2ac07d92 | 1053 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1054 | struct ide_atapi_pc pc; |
1da177e4 LT |
1055 | int rc; |
1056 | ||
1057 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
2ac07d92 | 1058 | rc = ide_queue_pc_tail(drive, tape->disk, &pc); |
5a04cfa9 | 1059 | if (rc) |
1da177e4 LT |
1060 | return rc; |
1061 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1062 | return 0; | |
1063 | } | |
1064 | ||
d236d74c | 1065 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1066 | { |
7bf7420a | 1067 | ide_init_pc(pc); |
90699ce2 | 1068 | pc->c[0] = READ_POSITION; |
d236d74c | 1069 | pc->req_xfer = 20; |
1da177e4 LT |
1070 | } |
1071 | ||
5a04cfa9 | 1072 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
1073 | { |
1074 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1075 | struct ide_atapi_pc pc; |
1da177e4 LT |
1076 | int position; |
1077 | ||
8004a8c9 | 1078 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
1079 | |
1080 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1081 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) |
1da177e4 | 1082 | return -1; |
54bb2074 | 1083 | position = tape->first_frame; |
1da177e4 LT |
1084 | return position; |
1085 | } | |
1086 | ||
d236d74c BP |
1087 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
1088 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1089 | unsigned int block, u8 partition, int skip) |
1da177e4 | 1090 | { |
7bf7420a | 1091 | ide_init_pc(pc); |
90699ce2 | 1092 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 1093 | pc->c[1] = 2; |
860ff5ec | 1094 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 1095 | pc->c[8] = partition; |
346331f8 | 1096 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1097 | } |
1098 | ||
ec0fdb01 | 1099 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1100 | { |
1101 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1102 | |
54abf37e | 1103 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 1104 | return; |
1da177e4 | 1105 | |
f2e3ab52 | 1106 | clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); |
01a63aeb | 1107 | tape->merge_bh_size = 0; |
077e3bdb BP |
1108 | if (tape->merge_bh != NULL) { |
1109 | ide_tape_kfree_buffer(tape); | |
1110 | tape->merge_bh = NULL; | |
1da177e4 LT |
1111 | } |
1112 | ||
54abf37e | 1113 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1114 | } |
1115 | ||
1116 | /* | |
3c98bf34 BP |
1117 | * Position the tape to the requested block using the LOCATE packet command. |
1118 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1119 | * all higher level operations, we queue the commands at the tail of the request | |
1120 | * queue and wait for their completion. | |
1da177e4 | 1121 | */ |
5a04cfa9 BP |
1122 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
1123 | u8 partition, int skip) | |
1da177e4 LT |
1124 | { |
1125 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1126 | struct gendisk *disk = tape->disk; |
1da177e4 | 1127 | int retval; |
d236d74c | 1128 | struct ide_atapi_pc pc; |
1da177e4 | 1129 | |
54abf37e | 1130 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 1131 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1132 | idetape_wait_ready(drive, 60 * 5 * HZ); |
1133 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
2ac07d92 | 1134 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1135 | if (retval) |
1136 | return (retval); | |
1137 | ||
1138 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1139 | return ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1140 | } |
1141 | ||
ec0fdb01 | 1142 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 1143 | int restore_position) |
1da177e4 LT |
1144 | { |
1145 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1146 | int seek, position; |
1147 | ||
ec0fdb01 | 1148 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1149 | if (restore_position) { |
1150 | position = idetape_read_position(drive); | |
9798630a | 1151 | seek = position > 0 ? position : 0; |
1da177e4 | 1152 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 1153 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 1154 | " %s\n", tape->name, __func__); |
1da177e4 LT |
1155 | return; |
1156 | } | |
1157 | } | |
1158 | } | |
1159 | ||
1160 | /* | |
3c98bf34 BP |
1161 | * Generate a read/write request for the block device interface and wait for it |
1162 | * to be serviced. | |
1da177e4 | 1163 | */ |
5a04cfa9 BP |
1164 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
1165 | struct idetape_bh *bh) | |
1da177e4 LT |
1166 | { |
1167 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a FT |
1168 | struct request *rq; |
1169 | int ret, errors; | |
1da177e4 | 1170 | |
8004a8c9 BP |
1171 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
1172 | ||
64ea1b4a FT |
1173 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1174 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1175 | rq->cmd[13] = cmd; |
64ea1b4a FT |
1176 | rq->rq_disk = tape->disk; |
1177 | rq->special = (void *)bh; | |
1178 | rq->sector = tape->first_frame; | |
1179 | rq->nr_sectors = blocks; | |
1180 | rq->current_nr_sectors = blocks; | |
1181 | blk_execute_rq(drive->queue, tape->disk, rq, 0); | |
1182 | ||
1183 | errors = rq->errors; | |
1184 | ret = tape->blk_size * (blocks - rq->current_nr_sectors); | |
1185 | blk_put_request(rq); | |
1da177e4 LT |
1186 | |
1187 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1188 | return 0; | |
1189 | ||
077e3bdb BP |
1190 | if (tape->merge_bh) |
1191 | idetape_init_merge_buffer(tape); | |
c152cc1a | 1192 | if (errors == IDE_DRV_ERROR_GENERAL) |
1da177e4 | 1193 | return -EIO; |
64ea1b4a | 1194 | return ret; |
1da177e4 LT |
1195 | } |
1196 | ||
d236d74c | 1197 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1198 | { |
7bf7420a | 1199 | ide_init_pc(pc); |
90699ce2 | 1200 | pc->c[0] = INQUIRY; |
5a04cfa9 | 1201 | pc->c[4] = 254; |
d236d74c | 1202 | pc->req_xfer = 254; |
1da177e4 LT |
1203 | } |
1204 | ||
d236d74c BP |
1205 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
1206 | struct ide_atapi_pc *pc) | |
1da177e4 | 1207 | { |
7bf7420a | 1208 | ide_init_pc(pc); |
90699ce2 | 1209 | pc->c[0] = REZERO_UNIT; |
346331f8 | 1210 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1211 | } |
1212 | ||
d236d74c | 1213 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1214 | { |
7bf7420a | 1215 | ide_init_pc(pc); |
90699ce2 | 1216 | pc->c[0] = ERASE; |
1da177e4 | 1217 | pc->c[1] = 1; |
346331f8 | 1218 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1219 | } |
1220 | ||
d236d74c | 1221 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 | 1222 | { |
7bf7420a | 1223 | ide_init_pc(pc); |
90699ce2 | 1224 | pc->c[0] = SPACE; |
860ff5ec | 1225 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 1226 | pc->c[1] = cmd; |
346331f8 | 1227 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1228 | } |
1229 | ||
97c566ce | 1230 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 1231 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1232 | { |
1233 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1234 | |
8004a8c9 | 1235 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 1236 | |
0aa4b01e | 1237 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
077e3bdb | 1238 | blocks, tape->merge_bh); |
1da177e4 LT |
1239 | } |
1240 | ||
d9df937a | 1241 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1242 | { |
1243 | idetape_tape_t *tape = drive->driver_data; | |
1244 | int blocks, min; | |
1245 | struct idetape_bh *bh; | |
55a5d291 | 1246 | |
54abf37e | 1247 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 1248 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 1249 | " but we are not writing.\n"); |
1da177e4 LT |
1250 | return; |
1251 | } | |
01a63aeb | 1252 | if (tape->merge_bh_size > tape->buffer_size) { |
1da177e4 | 1253 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
01a63aeb | 1254 | tape->merge_bh_size = tape->buffer_size; |
1da177e4 | 1255 | } |
01a63aeb BP |
1256 | if (tape->merge_bh_size) { |
1257 | blocks = tape->merge_bh_size / tape->blk_size; | |
1258 | if (tape->merge_bh_size % tape->blk_size) { | |
1da177e4 LT |
1259 | unsigned int i; |
1260 | ||
1261 | blocks++; | |
01a63aeb | 1262 | i = tape->blk_size - tape->merge_bh_size % |
54bb2074 | 1263 | tape->blk_size; |
1da177e4 LT |
1264 | bh = tape->bh->b_reqnext; |
1265 | while (bh) { | |
1266 | atomic_set(&bh->b_count, 0); | |
1267 | bh = bh->b_reqnext; | |
1268 | } | |
1269 | bh = tape->bh; | |
1270 | while (i) { | |
1271 | if (bh == NULL) { | |
5a04cfa9 BP |
1272 | printk(KERN_INFO "ide-tape: bug," |
1273 | " bh NULL\n"); | |
1da177e4 LT |
1274 | break; |
1275 | } | |
5a04cfa9 BP |
1276 | min = min(i, (unsigned int)(bh->b_size - |
1277 | atomic_read(&bh->b_count))); | |
1278 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1279 | 0, min); | |
1da177e4 LT |
1280 | atomic_add(min, &bh->b_count); |
1281 | i -= min; | |
1282 | bh = bh->b_reqnext; | |
1283 | } | |
1284 | } | |
1285 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
01a63aeb | 1286 | tape->merge_bh_size = 0; |
1da177e4 | 1287 | } |
077e3bdb BP |
1288 | if (tape->merge_bh != NULL) { |
1289 | ide_tape_kfree_buffer(tape); | |
1290 | tape->merge_bh = NULL; | |
1da177e4 | 1291 | } |
54abf37e | 1292 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1293 | } |
1294 | ||
83042b24 | 1295 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
1296 | { |
1297 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1298 | int bytes_read; |
1da177e4 LT |
1299 | |
1300 | /* Initialize read operation */ | |
54abf37e BP |
1301 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1302 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
d9df937a | 1303 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1304 | idetape_flush_tape_buffers(drive); |
1305 | } | |
077e3bdb | 1306 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1307 | printk(KERN_ERR "ide-tape: merge_bh_size should be" |
5a04cfa9 | 1308 | " 0 now\n"); |
01a63aeb | 1309 | tape->merge_bh_size = 0; |
1da177e4 | 1310 | } |
077e3bdb BP |
1311 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1312 | if (!tape->merge_bh) | |
1da177e4 | 1313 | return -ENOMEM; |
54abf37e | 1314 | tape->chrdev_dir = IDETAPE_DIR_READ; |
1da177e4 LT |
1315 | |
1316 | /* | |
3c98bf34 BP |
1317 | * Issue a read 0 command to ensure that DSC handshake is |
1318 | * switched from completion mode to buffer available mode. | |
1319 | * No point in issuing this if DSC overlap isn't supported, some | |
1320 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 | 1321 | */ |
97100fc8 | 1322 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { |
5a04cfa9 BP |
1323 | bytes_read = idetape_queue_rw_tail(drive, |
1324 | REQ_IDETAPE_READ, 0, | |
077e3bdb | 1325 | tape->merge_bh); |
1da177e4 | 1326 | if (bytes_read < 0) { |
077e3bdb BP |
1327 | ide_tape_kfree_buffer(tape); |
1328 | tape->merge_bh = NULL; | |
54abf37e | 1329 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1330 | return bytes_read; |
1331 | } | |
1332 | } | |
1333 | } | |
5e69bd95 | 1334 | |
1da177e4 LT |
1335 | return 0; |
1336 | } | |
1337 | ||
5bd50dc6 | 1338 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1339 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1340 | { |
1341 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1342 | |
8004a8c9 | 1343 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1344 | |
3c98bf34 | 1345 | /* If we are at a filemark, return a read length of 0 */ |
f2e3ab52 | 1346 | if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 LT |
1347 | return 0; |
1348 | ||
83042b24 | 1349 | idetape_init_read(drive); |
5e69bd95 | 1350 | |
5e69bd95 | 1351 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
077e3bdb | 1352 | tape->merge_bh); |
1da177e4 LT |
1353 | } |
1354 | ||
5a04cfa9 | 1355 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1356 | { |
1357 | idetape_tape_t *tape = drive->driver_data; | |
1358 | struct idetape_bh *bh; | |
1359 | int blocks; | |
3c98bf34 | 1360 | |
1da177e4 LT |
1361 | while (bcount) { |
1362 | unsigned int count; | |
1363 | ||
077e3bdb | 1364 | bh = tape->merge_bh; |
f73850a3 | 1365 | count = min(tape->buffer_size, bcount); |
1da177e4 | 1366 | bcount -= count; |
54bb2074 | 1367 | blocks = count / tape->blk_size; |
1da177e4 | 1368 | while (count) { |
5a04cfa9 BP |
1369 | atomic_set(&bh->b_count, |
1370 | min(count, (unsigned int)bh->b_size)); | |
1da177e4 LT |
1371 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
1372 | count -= atomic_read(&bh->b_count); | |
1373 | bh = bh->b_reqnext; | |
1374 | } | |
5a04cfa9 | 1375 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
077e3bdb | 1376 | tape->merge_bh); |
1da177e4 LT |
1377 | } |
1378 | } | |
1379 | ||
1da177e4 | 1380 | /* |
3c98bf34 BP |
1381 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1382 | * currently support only one partition. | |
1383 | */ | |
5a04cfa9 | 1384 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 | 1385 | { |
2ac07d92 BZ |
1386 | struct ide_tape_obj *tape = drive->driver_data; |
1387 | struct gendisk *disk = tape->disk; | |
1da177e4 | 1388 | int retval; |
d236d74c | 1389 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1390 | |
1391 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1392 | ||
1da177e4 | 1393 | idetape_create_rewind_cmd(drive, &pc); |
2ac07d92 | 1394 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1395 | if (retval) |
1396 | return retval; | |
1397 | ||
1398 | idetape_create_read_position_cmd(&pc); | |
2ac07d92 | 1399 | retval = ide_queue_pc_tail(drive, disk, &pc); |
1da177e4 LT |
1400 | if (retval) |
1401 | return retval; | |
1402 | return 0; | |
1403 | } | |
1404 | ||
3c98bf34 | 1405 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1406 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1407 | unsigned long arg) | |
1da177e4 LT |
1408 | { |
1409 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1410 | void __user *argp = (void __user *)arg; |
1411 | ||
d59823fa BP |
1412 | struct idetape_config { |
1413 | int dsc_rw_frequency; | |
1414 | int dsc_media_access_frequency; | |
1415 | int nr_stages; | |
1416 | } config; | |
1417 | ||
8004a8c9 BP |
1418 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1419 | ||
1da177e4 | 1420 | switch (cmd) { |
5a04cfa9 BP |
1421 | case 0x0340: |
1422 | if (copy_from_user(&config, argp, sizeof(config))) | |
1423 | return -EFAULT; | |
1424 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1425 | break; |
1426 | case 0x0350: | |
1427 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1428 | config.nr_stages = 1; |
5a04cfa9 BP |
1429 | if (copy_to_user(argp, &config, sizeof(config))) |
1430 | return -EFAULT; | |
1431 | break; | |
1432 | default: | |
1433 | return -EIO; | |
1da177e4 LT |
1434 | } |
1435 | return 0; | |
1436 | } | |
1437 | ||
5a04cfa9 BP |
1438 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1439 | int mt_count) | |
1da177e4 LT |
1440 | { |
1441 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1442 | struct gendisk *disk = tape->disk; |
d236d74c | 1443 | struct ide_atapi_pc pc; |
5a04cfa9 | 1444 | int retval, count = 0; |
b6422013 | 1445 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1446 | |
1447 | if (mt_count == 0) | |
1448 | return 0; | |
1449 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1450 | if (!sprev) |
1da177e4 | 1451 | return -EIO; |
5a04cfa9 | 1452 | mt_count = -mt_count; |
1da177e4 LT |
1453 | } |
1454 | ||
54abf37e | 1455 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
01a63aeb | 1456 | tape->merge_bh_size = 0; |
f2e3ab52 | 1457 | if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 | 1458 | ++count; |
ec0fdb01 | 1459 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1460 | } |
1461 | ||
1da177e4 | 1462 | switch (mt_op) { |
5a04cfa9 BP |
1463 | case MTFSF: |
1464 | case MTBSF: | |
1465 | idetape_create_space_cmd(&pc, mt_count - count, | |
1466 | IDETAPE_SPACE_OVER_FILEMARK); | |
2ac07d92 | 1467 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1468 | case MTFSFM: |
1469 | case MTBSFM: | |
1470 | if (!sprev) | |
1471 | return -EIO; | |
1472 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1473 | mt_count - count); | |
1474 | if (retval) | |
1475 | return retval; | |
1476 | count = (MTBSFM == mt_op ? 1 : -1); | |
1477 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1478 | default: | |
1479 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1480 | mt_op); | |
1481 | return -EIO; | |
1da177e4 LT |
1482 | } |
1483 | } | |
1484 | ||
1da177e4 | 1485 | /* |
3c98bf34 | 1486 | * Our character device read / write functions. |
1da177e4 | 1487 | * |
3c98bf34 BP |
1488 | * The tape is optimized to maximize throughput when it is transferring an |
1489 | * integral number of the "continuous transfer limit", which is a parameter of | |
1490 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1491 | * |
3c98bf34 BP |
1492 | * As of version 1.3 of the driver, the character device provides an abstract |
1493 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1494 | * same backup/restore procedure is supported. The driver will internally | |
1495 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1496 | * between the user's block size to the recommended size will only result in a | |
1497 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1498 | * This is not applicable to Onstream. | |
1da177e4 | 1499 | */ |
5a04cfa9 BP |
1500 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1501 | size_t count, loff_t *ppos) | |
1da177e4 | 1502 | { |
5aeddf90 | 1503 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1504 | ide_drive_t *drive = tape->drive; |
5a04cfa9 | 1505 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 1506 | ssize_t ret = 0; |
b6422013 | 1507 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 1508 | |
8004a8c9 | 1509 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1510 | |
54abf37e | 1511 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
f2e3ab52 | 1512 | if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) |
54bb2074 BP |
1513 | if (count > tape->blk_size && |
1514 | (count % tape->blk_size) == 0) | |
1515 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1516 | } |
83042b24 | 1517 | rc = idetape_init_read(drive); |
8d06bfad | 1518 | if (rc < 0) |
1da177e4 LT |
1519 | return rc; |
1520 | if (count == 0) | |
1521 | return (0); | |
01a63aeb BP |
1522 | if (tape->merge_bh_size) { |
1523 | actually_read = min((unsigned int)(tape->merge_bh_size), | |
5a04cfa9 | 1524 | (unsigned int)count); |
99d74e61 | 1525 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
dcd96379 | 1526 | ret = -EFAULT; |
1da177e4 | 1527 | buf += actually_read; |
01a63aeb | 1528 | tape->merge_bh_size -= actually_read; |
1da177e4 LT |
1529 | count -= actually_read; |
1530 | } | |
f73850a3 | 1531 | while (count >= tape->buffer_size) { |
b6422013 | 1532 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1533 | if (bytes_read <= 0) |
1534 | goto finish; | |
99d74e61 | 1535 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
dcd96379 | 1536 | ret = -EFAULT; |
1da177e4 LT |
1537 | buf += bytes_read; |
1538 | count -= bytes_read; | |
1539 | actually_read += bytes_read; | |
1540 | } | |
1541 | if (count) { | |
b6422013 | 1542 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1543 | if (bytes_read <= 0) |
1544 | goto finish; | |
1545 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
99d74e61 | 1546 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
dcd96379 | 1547 | ret = -EFAULT; |
1da177e4 | 1548 | actually_read += temp; |
01a63aeb | 1549 | tape->merge_bh_size = bytes_read-temp; |
1da177e4 LT |
1550 | } |
1551 | finish: | |
f2e3ab52 | 1552 | if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { |
8004a8c9 BP |
1553 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1554 | ||
1da177e4 LT |
1555 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1556 | return 0; | |
1557 | } | |
dcd96379 | 1558 | |
5a04cfa9 | 1559 | return ret ? ret : actually_read; |
1da177e4 LT |
1560 | } |
1561 | ||
5a04cfa9 | 1562 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1563 | size_t count, loff_t *ppos) |
1564 | { | |
5aeddf90 | 1565 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 | 1566 | ide_drive_t *drive = tape->drive; |
dcd96379 DW |
1567 | ssize_t actually_written = 0; |
1568 | ssize_t ret = 0; | |
b6422013 | 1569 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
1570 | |
1571 | /* The drive is write protected. */ | |
1572 | if (tape->write_prot) | |
1573 | return -EACCES; | |
1574 | ||
8004a8c9 | 1575 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1576 | |
1577 | /* Initialize write operation */ | |
54abf37e BP |
1578 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
1579 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1580 | ide_tape_discard_merge_buffer(drive, 1); |
077e3bdb | 1581 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1582 | printk(KERN_ERR "ide-tape: merge_bh_size " |
1da177e4 | 1583 | "should be 0 now\n"); |
01a63aeb | 1584 | tape->merge_bh_size = 0; |
1da177e4 | 1585 | } |
077e3bdb BP |
1586 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1587 | if (!tape->merge_bh) | |
1da177e4 | 1588 | return -ENOMEM; |
54abf37e | 1589 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
077e3bdb | 1590 | idetape_init_merge_buffer(tape); |
1da177e4 LT |
1591 | |
1592 | /* | |
3c98bf34 BP |
1593 | * Issue a write 0 command to ensure that DSC handshake is |
1594 | * switched from completion mode to buffer available mode. No | |
1595 | * point in issuing this if DSC overlap isn't supported, some | |
1596 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 | 1597 | */ |
97100fc8 | 1598 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { |
5a04cfa9 BP |
1599 | ssize_t retval = idetape_queue_rw_tail(drive, |
1600 | REQ_IDETAPE_WRITE, 0, | |
077e3bdb | 1601 | tape->merge_bh); |
1da177e4 | 1602 | if (retval < 0) { |
077e3bdb BP |
1603 | ide_tape_kfree_buffer(tape); |
1604 | tape->merge_bh = NULL; | |
54abf37e | 1605 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1606 | return retval; |
1607 | } | |
1608 | } | |
1609 | } | |
1610 | if (count == 0) | |
1611 | return (0); | |
01a63aeb BP |
1612 | if (tape->merge_bh_size) { |
1613 | if (tape->merge_bh_size >= tape->buffer_size) { | |
5a04cfa9 | 1614 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
01a63aeb | 1615 | tape->merge_bh_size = 0; |
1da177e4 | 1616 | } |
5a04cfa9 | 1617 | actually_written = min((unsigned int) |
01a63aeb | 1618 | (tape->buffer_size - tape->merge_bh_size), |
5a04cfa9 | 1619 | (unsigned int)count); |
8646c88f | 1620 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
dcd96379 | 1621 | ret = -EFAULT; |
1da177e4 | 1622 | buf += actually_written; |
01a63aeb | 1623 | tape->merge_bh_size += actually_written; |
1da177e4 LT |
1624 | count -= actually_written; |
1625 | ||
01a63aeb | 1626 | if (tape->merge_bh_size == tape->buffer_size) { |
dcd96379 | 1627 | ssize_t retval; |
01a63aeb | 1628 | tape->merge_bh_size = 0; |
b6422013 | 1629 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
1630 | if (retval <= 0) |
1631 | return (retval); | |
1632 | } | |
1633 | } | |
f73850a3 | 1634 | while (count >= tape->buffer_size) { |
dcd96379 | 1635 | ssize_t retval; |
f73850a3 | 1636 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
dcd96379 | 1637 | ret = -EFAULT; |
f73850a3 BP |
1638 | buf += tape->buffer_size; |
1639 | count -= tape->buffer_size; | |
b6422013 | 1640 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 1641 | actually_written += tape->buffer_size; |
1da177e4 LT |
1642 | if (retval <= 0) |
1643 | return (retval); | |
1644 | } | |
1645 | if (count) { | |
1646 | actually_written += count; | |
8646c88f | 1647 | if (idetape_copy_stage_from_user(tape, buf, count)) |
dcd96379 | 1648 | ret = -EFAULT; |
01a63aeb | 1649 | tape->merge_bh_size += count; |
1da177e4 | 1650 | } |
5a04cfa9 | 1651 | return ret ? ret : actually_written; |
1da177e4 LT |
1652 | } |
1653 | ||
5a04cfa9 | 1654 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1655 | { |
2ac07d92 | 1656 | struct ide_tape_obj *tape = drive->driver_data; |
d236d74c | 1657 | struct ide_atapi_pc pc; |
1da177e4 LT |
1658 | |
1659 | /* Write a filemark */ | |
1660 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
2ac07d92 | 1661 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
1da177e4 LT |
1662 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
1663 | return -EIO; | |
1664 | } | |
1665 | return 0; | |
1666 | } | |
1667 | ||
1668 | /* | |
d99c9da2 BP |
1669 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1670 | * requested. | |
1da177e4 | 1671 | * |
d99c9da2 BP |
1672 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1673 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1674 | * usually not supported. |
1da177e4 | 1675 | * |
d99c9da2 | 1676 | * The following commands are currently not supported: |
1da177e4 | 1677 | * |
d99c9da2 BP |
1678 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1679 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1680 | */ |
d99c9da2 | 1681 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1682 | { |
1683 | idetape_tape_t *tape = drive->driver_data; | |
2ac07d92 | 1684 | struct gendisk *disk = tape->disk; |
d236d74c | 1685 | struct ide_atapi_pc pc; |
5a04cfa9 | 1686 | int i, retval; |
1da177e4 | 1687 | |
8004a8c9 BP |
1688 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
1689 | mt_op, mt_count); | |
5a04cfa9 | 1690 | |
1da177e4 | 1691 | switch (mt_op) { |
5a04cfa9 BP |
1692 | case MTFSF: |
1693 | case MTFSFM: | |
1694 | case MTBSF: | |
1695 | case MTBSFM: | |
1696 | if (!mt_count) | |
1697 | return 0; | |
1698 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1699 | default: | |
1700 | break; | |
1da177e4 | 1701 | } |
5a04cfa9 | 1702 | |
1da177e4 | 1703 | switch (mt_op) { |
5a04cfa9 BP |
1704 | case MTWEOF: |
1705 | if (tape->write_prot) | |
1706 | return -EACCES; | |
ec0fdb01 | 1707 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1708 | for (i = 0; i < mt_count; i++) { |
1709 | retval = idetape_write_filemark(drive); | |
1710 | if (retval) | |
1711 | return retval; | |
1712 | } | |
1713 | return 0; | |
1714 | case MTREW: | |
ec0fdb01 | 1715 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1716 | if (idetape_rewind_tape(drive)) |
1717 | return -EIO; | |
1718 | return 0; | |
1719 | case MTLOAD: | |
ec0fdb01 | 1720 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1721 | return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1722 | case MTUNLOAD: |
1723 | case MTOFFL: | |
1724 | /* | |
1725 | * If door is locked, attempt to unlock before | |
1726 | * attempting to eject. | |
1727 | */ | |
1728 | if (tape->door_locked) { | |
0578042d | 1729 | if (!ide_set_media_lock(drive, disk, 0)) |
385a4b87 | 1730 | tape->door_locked = DOOR_UNLOCKED; |
5a04cfa9 | 1731 | } |
ec0fdb01 | 1732 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1733 | retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); |
5a04cfa9 | 1734 | if (!retval) |
f2e3ab52 | 1735 | clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
5a04cfa9 BP |
1736 | return retval; |
1737 | case MTNOP: | |
ec0fdb01 | 1738 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1739 | return idetape_flush_tape_buffers(drive); |
1740 | case MTRETEN: | |
ec0fdb01 | 1741 | ide_tape_discard_merge_buffer(drive, 0); |
0c8a6c7a | 1742 | return ide_do_start_stop(drive, disk, |
5a04cfa9 | 1743 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
5a04cfa9 BP |
1744 | case MTEOM: |
1745 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
2ac07d92 | 1746 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1747 | case MTERASE: |
1748 | (void)idetape_rewind_tape(drive); | |
1749 | idetape_create_erase_cmd(&pc); | |
2ac07d92 | 1750 | return ide_queue_pc_tail(drive, disk, &pc); |
5a04cfa9 BP |
1751 | case MTSETBLK: |
1752 | if (mt_count) { | |
1753 | if (mt_count < tape->blk_size || | |
1754 | mt_count % tape->blk_size) | |
1da177e4 | 1755 | return -EIO; |
5a04cfa9 | 1756 | tape->user_bs_factor = mt_count / tape->blk_size; |
f2e3ab52 | 1757 | clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 | 1758 | } else |
f2e3ab52 | 1759 | set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 BP |
1760 | return 0; |
1761 | case MTSEEK: | |
ec0fdb01 | 1762 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1763 | return idetape_position_tape(drive, |
1764 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1765 | case MTSETPART: | |
ec0fdb01 | 1766 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1767 | return idetape_position_tape(drive, 0, mt_count, 0); |
1768 | case MTFSR: | |
1769 | case MTBSR: | |
1770 | case MTLOCK: | |
0578042d | 1771 | retval = ide_set_media_lock(drive, disk, 1); |
5a04cfa9 | 1772 | if (retval) |
1da177e4 | 1773 | return retval; |
5a04cfa9 BP |
1774 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1775 | return 0; | |
1776 | case MTUNLOCK: | |
0578042d | 1777 | retval = ide_set_media_lock(drive, disk, 0); |
5a04cfa9 BP |
1778 | if (retval) |
1779 | return retval; | |
1780 | tape->door_locked = DOOR_UNLOCKED; | |
1781 | return 0; | |
1782 | default: | |
1783 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1784 | mt_op); | |
1785 | return -EIO; | |
1da177e4 LT |
1786 | } |
1787 | } | |
1788 | ||
1789 | /* | |
d99c9da2 BP |
1790 | * Our character device ioctls. General mtio.h magnetic io commands are |
1791 | * supported here, and not in the corresponding block interface. Our own | |
1792 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 1793 | */ |
d99c9da2 BP |
1794 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
1795 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1796 | { |
5aeddf90 | 1797 | struct ide_tape_obj *tape = file->private_data; |
1da177e4 LT |
1798 | ide_drive_t *drive = tape->drive; |
1799 | struct mtop mtop; | |
1800 | struct mtget mtget; | |
1801 | struct mtpos mtpos; | |
54bb2074 | 1802 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
1803 | void __user *argp = (void __user *)arg; |
1804 | ||
8004a8c9 | 1805 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 1806 | |
54abf37e | 1807 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 1808 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1809 | idetape_flush_tape_buffers(drive); |
1810 | } | |
1811 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
01a63aeb | 1812 | block_offset = tape->merge_bh_size / |
54bb2074 | 1813 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
1814 | position = idetape_read_position(drive); |
1815 | if (position < 0) | |
1da177e4 LT |
1816 | return -EIO; |
1817 | } | |
1818 | switch (cmd) { | |
5a04cfa9 BP |
1819 | case MTIOCTOP: |
1820 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
1821 | return -EFAULT; | |
1822 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
1823 | case MTIOCGET: | |
1824 | memset(&mtget, 0, sizeof(struct mtget)); | |
1825 | mtget.mt_type = MT_ISSCSI2; | |
1826 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1827 | mtget.mt_dsreg = | |
1828 | ((tape->blk_size * tape->user_bs_factor) | |
1829 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
1830 | ||
1831 | if (tape->drv_write_prot) | |
1832 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
1833 | ||
1834 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
1835 | return -EFAULT; | |
1836 | return 0; | |
1837 | case MTIOCPOS: | |
1838 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1839 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
1840 | return -EFAULT; | |
1841 | return 0; | |
1842 | default: | |
1843 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1844 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 1845 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
1846 | } |
1847 | } | |
1848 | ||
3cffb9ce BP |
1849 | /* |
1850 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
1851 | * block size with the reported value. | |
1852 | */ | |
1853 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
1854 | { | |
1855 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1856 | struct ide_atapi_pc pc; |
3cffb9ce BP |
1857 | |
1858 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2ac07d92 | 1859 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
3cffb9ce | 1860 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
54bb2074 | 1861 | if (tape->blk_size == 0) { |
3cffb9ce BP |
1862 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
1863 | "block size, assuming 32k\n"); | |
54bb2074 | 1864 | tape->blk_size = 32768; |
3cffb9ce BP |
1865 | } |
1866 | return; | |
1867 | } | |
d236d74c BP |
1868 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
1869 | (pc.buf[4 + 6] << 8) + | |
1870 | pc.buf[4 + 7]; | |
1871 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 1872 | } |
1da177e4 | 1873 | |
5a04cfa9 | 1874 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
1875 | { |
1876 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
1877 | ide_drive_t *drive; | |
1878 | idetape_tape_t *tape; | |
1da177e4 LT |
1879 | int retval; |
1880 | ||
8004a8c9 BP |
1881 | if (i >= MAX_HWIFS * MAX_DRIVES) |
1882 | return -ENXIO; | |
1883 | ||
04f4ac9d | 1884 | lock_kernel(); |
8004a8c9 | 1885 | tape = ide_tape_chrdev_get(i); |
04f4ac9d JC |
1886 | if (!tape) { |
1887 | unlock_kernel(); | |
8004a8c9 | 1888 | return -ENXIO; |
04f4ac9d | 1889 | } |
8004a8c9 BP |
1890 | |
1891 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1892 | ||
1da177e4 LT |
1893 | /* |
1894 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1895 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1896 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1897 | */ | |
1898 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1899 | ||
1da177e4 LT |
1900 | drive = tape->drive; |
1901 | ||
1902 | filp->private_data = tape; | |
1903 | ||
f2e3ab52 | 1904 | if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { |
1da177e4 LT |
1905 | retval = -EBUSY; |
1906 | goto out_put_tape; | |
1907 | } | |
1908 | ||
1909 | retval = idetape_wait_ready(drive, 60 * HZ); | |
1910 | if (retval) { | |
f2e3ab52 | 1911 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1912 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
1913 | goto out_put_tape; | |
1914 | } | |
1915 | ||
1916 | idetape_read_position(drive); | |
f2e3ab52 | 1917 | if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) |
1da177e4 LT |
1918 | (void)idetape_rewind_tape(drive); |
1919 | ||
1da177e4 | 1920 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 1921 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
1922 | |
1923 | /* Set write protect flag if device is opened as read-only. */ | |
1924 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
1925 | tape->write_prot = 1; | |
1926 | else | |
1927 | tape->write_prot = tape->drv_write_prot; | |
1928 | ||
1929 | /* Make sure drive isn't write protected if user wants to write. */ | |
1930 | if (tape->write_prot) { | |
1931 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
1932 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
f2e3ab52 | 1933 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1934 | retval = -EROFS; |
1935 | goto out_put_tape; | |
1936 | } | |
1937 | } | |
1938 | ||
3c98bf34 | 1939 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 1940 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
0578042d | 1941 | if (!ide_set_media_lock(drive, tape->disk, 1)) { |
385a4b87 BZ |
1942 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
1943 | tape->door_locked = DOOR_LOCKED; | |
1da177e4 LT |
1944 | } |
1945 | } | |
04f4ac9d | 1946 | unlock_kernel(); |
1da177e4 LT |
1947 | return 0; |
1948 | ||
1949 | out_put_tape: | |
1950 | ide_tape_put(tape); | |
04f4ac9d | 1951 | unlock_kernel(); |
1da177e4 LT |
1952 | return retval; |
1953 | } | |
1954 | ||
5a04cfa9 | 1955 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
1956 | { |
1957 | idetape_tape_t *tape = drive->driver_data; | |
1958 | ||
d9df937a | 1959 | ide_tape_flush_merge_buffer(drive); |
077e3bdb BP |
1960 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); |
1961 | if (tape->merge_bh != NULL) { | |
54bb2074 BP |
1962 | idetape_pad_zeros(drive, tape->blk_size * |
1963 | (tape->user_bs_factor - 1)); | |
077e3bdb BP |
1964 | ide_tape_kfree_buffer(tape); |
1965 | tape->merge_bh = NULL; | |
1da177e4 LT |
1966 | } |
1967 | idetape_write_filemark(drive); | |
1968 | idetape_flush_tape_buffers(drive); | |
1969 | idetape_flush_tape_buffers(drive); | |
1970 | } | |
1971 | ||
5a04cfa9 | 1972 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 | 1973 | { |
5aeddf90 | 1974 | struct ide_tape_obj *tape = filp->private_data; |
1da177e4 | 1975 | ide_drive_t *drive = tape->drive; |
1da177e4 LT |
1976 | unsigned int minor = iminor(inode); |
1977 | ||
1978 | lock_kernel(); | |
1979 | tape = drive->driver_data; | |
8004a8c9 BP |
1980 | |
1981 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 1982 | |
54abf37e | 1983 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 1984 | idetape_write_release(drive, minor); |
54abf37e | 1985 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 1986 | if (minor < 128) |
ec0fdb01 | 1987 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 1988 | } |
f64eee7b | 1989 | |
f2e3ab52 | 1990 | if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) |
1da177e4 | 1991 | (void) idetape_rewind_tape(drive); |
54abf37e | 1992 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 | 1993 | if (tape->door_locked == DOOR_LOCKED) { |
0578042d | 1994 | if (!ide_set_media_lock(drive, tape->disk, 0)) |
385a4b87 | 1995 | tape->door_locked = DOOR_UNLOCKED; |
1da177e4 LT |
1996 | } |
1997 | } | |
f2e3ab52 | 1998 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
1999 | ide_tape_put(tape); |
2000 | unlock_kernel(); | |
2001 | return 0; | |
2002 | } | |
2003 | ||
6d29c8f0 | 2004 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 2005 | { |
1da177e4 | 2006 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 2007 | struct ide_atapi_pc pc; |
801bd32e | 2008 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 2009 | |
1da177e4 | 2010 | idetape_create_inquiry_cmd(&pc); |
2ac07d92 | 2011 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
6d29c8f0 BP |
2012 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
2013 | tape->name); | |
1da177e4 LT |
2014 | return; |
2015 | } | |
d236d74c BP |
2016 | memcpy(vendor_id, &pc.buf[8], 8); |
2017 | memcpy(product_id, &pc.buf[16], 16); | |
2018 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 | 2019 | |
801bd32e BP |
2020 | ide_fixstring(vendor_id, 8, 0); |
2021 | ide_fixstring(product_id, 16, 0); | |
2022 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 2023 | |
801bd32e | 2024 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 2025 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
2026 | } |
2027 | ||
2028 | /* | |
b6422013 BP |
2029 | * Ask the tape about its various parameters. In particular, we will adjust our |
2030 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 2031 | */ |
5a04cfa9 | 2032 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
2033 | { |
2034 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2035 | struct ide_atapi_pc pc; |
b6422013 BP |
2036 | u8 *caps; |
2037 | u8 speed, max_speed; | |
47314fa4 | 2038 | |
1da177e4 | 2039 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2ac07d92 | 2040 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { |
b6422013 BP |
2041 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
2042 | " some default values\n"); | |
54bb2074 | 2043 | tape->blk_size = 512; |
b6422013 BP |
2044 | put_unaligned(52, (u16 *)&tape->caps[12]); |
2045 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2046 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
2047 | return; |
2048 | } | |
d236d74c | 2049 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
2050 | |
2051 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
2052 | speed = be16_to_cpup((__be16 *)&caps[14]); |
2053 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 2054 | |
cd740ab0 HH |
2055 | *(u16 *)&caps[8] = max_speed; |
2056 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
2057 | *(u16 *)&caps[14] = speed; | |
2058 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 2059 | |
b6422013 BP |
2060 | if (!speed) { |
2061 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2062 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2063 | *(u16 *)&caps[14] = 650; |
1da177e4 | 2064 | } |
b6422013 BP |
2065 | if (!max_speed) { |
2066 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2067 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2068 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
2069 | } |
2070 | ||
b6422013 | 2071 | memcpy(&tape->caps, caps, 20); |
0578042d BZ |
2072 | |
2073 | /* device lacks locking support according to capabilities page */ | |
2074 | if ((caps[6] & 1) == 0) | |
42619d35 | 2075 | drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; |
0578042d | 2076 | |
b6422013 | 2077 | if (caps[7] & 0x02) |
54bb2074 | 2078 | tape->blk_size = 512; |
b6422013 | 2079 | else if (caps[7] & 0x04) |
54bb2074 | 2080 | tape->blk_size = 1024; |
1da177e4 LT |
2081 | } |
2082 | ||
7662d046 | 2083 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
2084 | #define ide_tape_devset_get(name, field) \ |
2085 | static int get_##name(ide_drive_t *drive) \ | |
2086 | { \ | |
2087 | idetape_tape_t *tape = drive->driver_data; \ | |
2088 | return tape->field; \ | |
2089 | } | |
2090 | ||
2091 | #define ide_tape_devset_set(name, field) \ | |
2092 | static int set_##name(ide_drive_t *drive, int arg) \ | |
2093 | { \ | |
2094 | idetape_tape_t *tape = drive->driver_data; \ | |
2095 | tape->field = arg; \ | |
2096 | return 0; \ | |
2097 | } | |
2098 | ||
92f1f8fd | 2099 | #define ide_tape_devset_rw_field(_name, _field) \ |
8185d5aa BZ |
2100 | ide_tape_devset_get(_name, _field) \ |
2101 | ide_tape_devset_set(_name, _field) \ | |
92f1f8fd | 2102 | IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) |
8185d5aa | 2103 | |
92f1f8fd | 2104 | #define ide_tape_devset_r_field(_name, _field) \ |
8185d5aa | 2105 | ide_tape_devset_get(_name, _field) \ |
92f1f8fd | 2106 | IDE_DEVSET(_name, 0, get_##_name, NULL) |
8185d5aa BZ |
2107 | |
2108 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
2109 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
2110 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
2111 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
2112 | ||
97100fc8 | 2113 | ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); |
92f1f8fd EO |
2114 | |
2115 | ide_tape_devset_rw_field(debug_mask, debug_mask); | |
2116 | ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); | |
2117 | ||
2118 | ide_tape_devset_r_field(avg_speed, avg_speed); | |
2119 | ide_tape_devset_r_field(speed, caps[14]); | |
2120 | ide_tape_devset_r_field(buffer, caps[16]); | |
2121 | ide_tape_devset_r_field(buffer_size, buffer_size); | |
2122 | ||
2123 | static const struct ide_proc_devset idetape_settings[] = { | |
2124 | __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), | |
2125 | __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), | |
2126 | __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), | |
2127 | __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), | |
2128 | __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), | |
2129 | __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), | |
2130 | __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
2131 | mulf_tdsc, divf_tdsc), | |
71bfc7a7 | 2132 | { NULL }, |
8185d5aa | 2133 | }; |
7662d046 | 2134 | #endif |
1da177e4 LT |
2135 | |
2136 | /* | |
3c98bf34 | 2137 | * The function below is called to: |
1da177e4 | 2138 | * |
3c98bf34 BP |
2139 | * 1. Initialize our various state variables. |
2140 | * 2. Ask the tape for its capabilities. | |
2141 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2142 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 2143 | * |
3c98bf34 BP |
2144 | * Note that at this point ide.c already assigned us an irq, so that we can |
2145 | * queue requests here and wait for their completion. | |
1da177e4 | 2146 | */ |
5a04cfa9 | 2147 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 2148 | { |
83042b24 | 2149 | unsigned long t; |
1da177e4 | 2150 | int speed; |
f73850a3 | 2151 | int buffer_size; |
b6422013 | 2152 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 2153 | |
85e39035 BZ |
2154 | drive->pc_callback = ide_tape_callback; |
2155 | drive->pc_update_buffers = idetape_update_buffers; | |
2156 | drive->pc_io_buffers = ide_tape_io_buffers; | |
776bb027 | 2157 | |
97100fc8 BZ |
2158 | drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; |
2159 | ||
4166c199 BZ |
2160 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
2161 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2162 | tape->name); | |
97100fc8 | 2163 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 2164 | } |
97100fc8 | 2165 | |
1da177e4 | 2166 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 2167 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
97100fc8 BZ |
2168 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
2169 | ||
1da177e4 LT |
2170 | tape->minor = minor; |
2171 | tape->name[0] = 'h'; | |
2172 | tape->name[1] = 't'; | |
2173 | tape->name[2] = '0' + minor; | |
54abf37e | 2174 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
4dde4492 | 2175 | |
1da177e4 LT |
2176 | idetape_get_inquiry_results(drive); |
2177 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 2178 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 2179 | tape->user_bs_factor = 1; |
f73850a3 BP |
2180 | tape->buffer_size = *ctl * tape->blk_size; |
2181 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 2182 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 2183 | *ctl /= 2; |
f73850a3 | 2184 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 2185 | } |
f73850a3 | 2186 | buffer_size = tape->buffer_size; |
a997a435 | 2187 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
f73850a3 | 2188 | if (buffer_size % PAGE_SIZE) { |
a997a435 | 2189 | tape->pages_per_buffer++; |
f73850a3 | 2190 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
1da177e4 LT |
2191 | } |
2192 | ||
83042b24 | 2193 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 2194 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 2195 | |
f73850a3 | 2196 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
2197 | |
2198 | /* | |
3c98bf34 BP |
2199 | * Ensure that the number we got makes sense; limit it within |
2200 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 2201 | */ |
a792bd5a HH |
2202 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
2203 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 2204 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 2205 | "%lums tDSC%s\n", |
b6422013 | 2206 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
2207 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
2208 | tape->buffer_size / 1024, | |
54bb2074 | 2209 | tape->best_dsc_rw_freq * 1000 / HZ, |
97100fc8 | 2210 | (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); |
1da177e4 | 2211 | |
1e874f44 | 2212 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
2213 | } |
2214 | ||
4031bbe4 | 2215 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
2216 | { |
2217 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 2218 | |
7662d046 | 2219 | ide_proc_unregister_driver(drive, tape->driver); |
8fed4368 | 2220 | device_del(&tape->dev); |
1da177e4 LT |
2221 | ide_unregister_region(tape->disk); |
2222 | ||
8fed4368 BZ |
2223 | mutex_lock(&idetape_ref_mutex); |
2224 | put_device(&tape->dev); | |
2225 | mutex_unlock(&idetape_ref_mutex); | |
1da177e4 LT |
2226 | } |
2227 | ||
8fed4368 | 2228 | static void ide_tape_release(struct device *dev) |
1da177e4 | 2229 | { |
8fed4368 | 2230 | struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); |
1da177e4 LT |
2231 | ide_drive_t *drive = tape->drive; |
2232 | struct gendisk *g = tape->disk; | |
2233 | ||
01a63aeb | 2234 | BUG_ON(tape->merge_bh_size); |
8604affd | 2235 | |
97100fc8 | 2236 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1da177e4 | 2237 | drive->driver_data = NULL; |
dbc1272e | 2238 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
2239 | device_destroy(idetape_sysfs_class, |
2240 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
2241 | idetape_devs[tape->minor] = NULL; |
2242 | g->private_data = NULL; | |
2243 | put_disk(g); | |
2244 | kfree(tape); | |
2245 | } | |
2246 | ||
ecfd80e4 | 2247 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
2248 | static int proc_idetape_read_name |
2249 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2250 | { | |
2251 | ide_drive_t *drive = (ide_drive_t *) data; | |
2252 | idetape_tape_t *tape = drive->driver_data; | |
2253 | char *out = page; | |
2254 | int len; | |
2255 | ||
2256 | len = sprintf(out, "%s\n", tape->name); | |
2257 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2258 | } | |
2259 | ||
2260 | static ide_proc_entry_t idetape_proc[] = { | |
2261 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2262 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2263 | { NULL, 0, NULL, NULL } | |
2264 | }; | |
79cb3803 BZ |
2265 | |
2266 | static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) | |
2267 | { | |
2268 | return idetape_proc; | |
2269 | } | |
2270 | ||
2271 | static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) | |
2272 | { | |
2273 | return idetape_settings; | |
2274 | } | |
1da177e4 LT |
2275 | #endif |
2276 | ||
4031bbe4 | 2277 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 2278 | |
7f3c868b | 2279 | static struct ide_driver idetape_driver = { |
8604affd | 2280 | .gen_driver = { |
4ef3b8f4 | 2281 | .owner = THIS_MODULE, |
8604affd BZ |
2282 | .name = "ide-tape", |
2283 | .bus = &ide_bus_type, | |
8604affd | 2284 | }, |
4031bbe4 RK |
2285 | .probe = ide_tape_probe, |
2286 | .remove = ide_tape_remove, | |
1da177e4 | 2287 | .version = IDETAPE_VERSION, |
1da177e4 | 2288 | .do_request = idetape_do_request, |
7662d046 | 2289 | #ifdef CONFIG_IDE_PROC_FS |
79cb3803 BZ |
2290 | .proc_entries = ide_tape_proc_entries, |
2291 | .proc_devsets = ide_tape_proc_devsets, | |
7662d046 | 2292 | #endif |
1da177e4 LT |
2293 | }; |
2294 | ||
3c98bf34 | 2295 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 2296 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
2297 | .owner = THIS_MODULE, |
2298 | .read = idetape_chrdev_read, | |
2299 | .write = idetape_chrdev_write, | |
2300 | .ioctl = idetape_chrdev_ioctl, | |
2301 | .open = idetape_chrdev_open, | |
2302 | .release = idetape_chrdev_release, | |
2303 | }; | |
2304 | ||
a4600f81 | 2305 | static int idetape_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 2306 | { |
a4600f81 | 2307 | struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk); |
1da177e4 | 2308 | |
5a04cfa9 | 2309 | if (!tape) |
1da177e4 LT |
2310 | return -ENXIO; |
2311 | ||
1da177e4 LT |
2312 | return 0; |
2313 | } | |
2314 | ||
a4600f81 | 2315 | static int idetape_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2316 | { |
5aeddf90 | 2317 | struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); |
1da177e4 LT |
2318 | |
2319 | ide_tape_put(tape); | |
1da177e4 LT |
2320 | return 0; |
2321 | } | |
2322 | ||
a4600f81 | 2323 | static int idetape_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
2324 | unsigned int cmd, unsigned long arg) |
2325 | { | |
5aeddf90 | 2326 | struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); |
1da177e4 | 2327 | ide_drive_t *drive = tape->drive; |
1bddd9e6 | 2328 | int err = generic_ide_ioctl(drive, bdev, cmd, arg); |
1da177e4 LT |
2329 | if (err == -EINVAL) |
2330 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2331 | return err; | |
2332 | } | |
2333 | ||
2334 | static struct block_device_operations idetape_block_ops = { | |
2335 | .owner = THIS_MODULE, | |
a4600f81 AV |
2336 | .open = idetape_open, |
2337 | .release = idetape_release, | |
2338 | .locked_ioctl = idetape_ioctl, | |
1da177e4 LT |
2339 | }; |
2340 | ||
4031bbe4 | 2341 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2342 | { |
2343 | idetape_tape_t *tape; | |
2344 | struct gendisk *g; | |
2345 | int minor; | |
2346 | ||
2347 | if (!strstr("ide-tape", drive->driver_req)) | |
2348 | goto failed; | |
2a924662 | 2349 | |
1da177e4 LT |
2350 | if (drive->media != ide_tape) |
2351 | goto failed; | |
2a924662 | 2352 | |
97100fc8 BZ |
2353 | if ((drive->dev_flags & IDE_DFLAG_ID_READ) && |
2354 | ide_check_atapi_device(drive, DRV_NAME) == 0) { | |
5a04cfa9 BP |
2355 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
2356 | " the driver\n", drive->name); | |
1da177e4 LT |
2357 | goto failed; |
2358 | } | |
5a04cfa9 | 2359 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2360 | if (tape == NULL) { |
5a04cfa9 BP |
2361 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2362 | drive->name); | |
1da177e4 LT |
2363 | goto failed; |
2364 | } | |
2365 | ||
2366 | g = alloc_disk(1 << PARTN_BITS); | |
2367 | if (!g) | |
2368 | goto out_free_tape; | |
2369 | ||
2370 | ide_init_disk(g, drive); | |
2371 | ||
8fed4368 BZ |
2372 | tape->dev.parent = &drive->gendev; |
2373 | tape->dev.release = ide_tape_release; | |
2374 | dev_set_name(&tape->dev, dev_name(&drive->gendev)); | |
2375 | ||
2376 | if (device_register(&tape->dev)) | |
2377 | goto out_free_disk; | |
1da177e4 LT |
2378 | |
2379 | tape->drive = drive; | |
2380 | tape->driver = &idetape_driver; | |
2381 | tape->disk = g; | |
2382 | ||
2383 | g->private_data = &tape->driver; | |
2384 | ||
2385 | drive->driver_data = tape; | |
2386 | ||
cf8b8975 | 2387 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2388 | for (minor = 0; idetape_devs[minor]; minor++) |
2389 | ; | |
2390 | idetape_devs[minor] = tape; | |
cf8b8975 | 2391 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2392 | |
2393 | idetape_setup(drive, tape, minor); | |
2394 | ||
3ee074bf GKH |
2395 | device_create(idetape_sysfs_class, &drive->gendev, |
2396 | MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); | |
2397 | device_create(idetape_sysfs_class, &drive->gendev, | |
2398 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
2399 | "n%s", tape->name); | |
d5dee80a | 2400 | |
1da177e4 LT |
2401 | g->fops = &idetape_block_ops; |
2402 | ide_register_region(g); | |
2403 | ||
2404 | return 0; | |
8604affd | 2405 | |
8fed4368 BZ |
2406 | out_free_disk: |
2407 | put_disk(g); | |
1da177e4 LT |
2408 | out_free_tape: |
2409 | kfree(tape); | |
2410 | failed: | |
8604affd | 2411 | return -ENODEV; |
1da177e4 LT |
2412 | } |
2413 | ||
5a04cfa9 | 2414 | static void __exit idetape_exit(void) |
1da177e4 | 2415 | { |
8604affd | 2416 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2417 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2418 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2419 | } | |
2420 | ||
17514e8a | 2421 | static int __init idetape_init(void) |
1da177e4 | 2422 | { |
d5dee80a WD |
2423 | int error = 1; |
2424 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2425 | if (IS_ERR(idetape_sysfs_class)) { | |
2426 | idetape_sysfs_class = NULL; | |
2427 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2428 | error = -EBUSY; | |
2429 | goto out; | |
2430 | } | |
2431 | ||
1da177e4 | 2432 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2433 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2434 | " interface\n"); | |
d5dee80a WD |
2435 | error = -EBUSY; |
2436 | goto out_free_class; | |
1da177e4 | 2437 | } |
d5dee80a WD |
2438 | |
2439 | error = driver_register(&idetape_driver.gen_driver); | |
2440 | if (error) | |
2441 | goto out_free_driver; | |
2442 | ||
2443 | return 0; | |
2444 | ||
2445 | out_free_driver: | |
2446 | driver_unregister(&idetape_driver.gen_driver); | |
2447 | out_free_class: | |
2448 | class_destroy(idetape_sysfs_class); | |
2449 | out: | |
2450 | return error; | |
1da177e4 LT |
2451 | } |
2452 | ||
263756ec | 2453 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2454 | module_init(idetape_init); |
2455 | module_exit(idetape_exit); | |
2456 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2457 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2458 | MODULE_LICENSE("GPL"); |