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Commit | Line | Data |
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1da177e4 | 1 | /* |
5ce78af4 BP |
2 | * IDE ATAPI streaming tape driver. |
3 | * | |
59bca8cc BZ |
4 | * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> |
5 | * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz | |
1da177e4 | 6 | * |
1da177e4 LT |
7 | * This driver was constructed as a student project in the software laboratory |
8 | * of the faculty of electrical engineering in the Technion - Israel's | |
9 | * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. | |
10 | * | |
11 | * It is hereby placed under the terms of the GNU general public license. | |
12 | * (See linux/COPYING). | |
1da177e4 | 13 | * |
5ce78af4 BP |
14 | * For a historical changelog see |
15 | * Documentation/ide/ChangeLog.ide-tape.1995-2002 | |
1da177e4 LT |
16 | */ |
17 | ||
51509eec BZ |
18 | #define DRV_NAME "ide-tape" |
19 | ||
dfe79936 | 20 | #define IDETAPE_VERSION "1.20" |
1da177e4 | 21 | |
1da177e4 LT |
22 | #include <linux/module.h> |
23 | #include <linux/types.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/timer.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/interrupt.h> | |
9bae1ff3 | 30 | #include <linux/jiffies.h> |
1da177e4 | 31 | #include <linux/major.h> |
1da177e4 LT |
32 | #include <linux/errno.h> |
33 | #include <linux/genhd.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/pci.h> | |
36 | #include <linux/ide.h> | |
37 | #include <linux/smp_lock.h> | |
38 | #include <linux/completion.h> | |
39 | #include <linux/bitops.h> | |
cf8b8975 | 40 | #include <linux/mutex.h> |
90699ce2 | 41 | #include <scsi/scsi.h> |
1da177e4 LT |
42 | |
43 | #include <asm/byteorder.h> | |
c837cfa5 BP |
44 | #include <linux/irq.h> |
45 | #include <linux/uaccess.h> | |
46 | #include <linux/io.h> | |
1da177e4 | 47 | #include <asm/unaligned.h> |
1da177e4 LT |
48 | #include <linux/mtio.h> |
49 | ||
8004a8c9 BP |
50 | enum { |
51 | /* output errors only */ | |
52 | DBG_ERR = (1 << 0), | |
53 | /* output all sense key/asc */ | |
54 | DBG_SENSE = (1 << 1), | |
55 | /* info regarding all chrdev-related procedures */ | |
56 | DBG_CHRDEV = (1 << 2), | |
57 | /* all remaining procedures */ | |
58 | DBG_PROCS = (1 << 3), | |
8004a8c9 BP |
59 | }; |
60 | ||
61 | /* define to see debug info */ | |
62 | #define IDETAPE_DEBUG_LOG 0 | |
63 | ||
64 | #if IDETAPE_DEBUG_LOG | |
65 | #define debug_log(lvl, fmt, args...) \ | |
66 | { \ | |
67 | if (tape->debug_mask & lvl) \ | |
68 | printk(KERN_INFO "ide-tape: " fmt, ## args); \ | |
69 | } | |
70 | #else | |
71 | #define debug_log(lvl, fmt, args...) do {} while (0) | |
72 | #endif | |
73 | ||
1da177e4 | 74 | /**************************** Tunable parameters *****************************/ |
1da177e4 | 75 | /* |
3c98bf34 BP |
76 | * After each failed packet command we issue a request sense command and retry |
77 | * the packet command IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 78 | * |
3c98bf34 | 79 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
1da177e4 LT |
80 | */ |
81 | #define IDETAPE_MAX_PC_RETRIES 3 | |
82 | ||
1da177e4 LT |
83 | /* |
84 | * Some drives (for example, Seagate STT3401A Travan) require a very long | |
85 | * timeout, because they don't return an interrupt or clear their busy bit | |
86 | * until after the command completes (even retension commands). | |
87 | */ | |
88 | #define IDETAPE_WAIT_CMD (900*HZ) | |
89 | ||
90 | /* | |
3c98bf34 BP |
91 | * The following parameter is used to select the point in the internal tape fifo |
92 | * in which we will start to refill the buffer. Decreasing the following | |
93 | * parameter will improve the system's latency and interactive response, while | |
94 | * using a high value might improve system throughput. | |
1da177e4 | 95 | */ |
3c98bf34 | 96 | #define IDETAPE_FIFO_THRESHOLD 2 |
1da177e4 LT |
97 | |
98 | /* | |
3c98bf34 | 99 | * DSC polling parameters. |
1da177e4 | 100 | * |
3c98bf34 BP |
101 | * Polling for DSC (a single bit in the status register) is a very important |
102 | * function in ide-tape. There are two cases in which we poll for DSC: | |
1da177e4 | 103 | * |
3c98bf34 BP |
104 | * 1. Before a read/write packet command, to ensure that we can transfer data |
105 | * from/to the tape's data buffers, without causing an actual media access. | |
106 | * In case the tape is not ready yet, we take out our request from the device | |
107 | * request queue, so that ide.c could service requests from the other device | |
108 | * on the same interface in the meantime. | |
1da177e4 | 109 | * |
3c98bf34 BP |
110 | * 2. After the successful initialization of a "media access packet command", |
111 | * which is a command that can take a long time to complete (the interval can | |
112 | * range from several seconds to even an hour). Again, we postpone our request | |
113 | * in the middle to free the bus for the other device. The polling frequency | |
114 | * here should be lower than the read/write frequency since those media access | |
115 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST | |
116 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD | |
117 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). | |
1da177e4 | 118 | * |
3c98bf34 BP |
119 | * We also set a timeout for the timer, in case something goes wrong. The |
120 | * timeout should be longer then the maximum execution time of a tape operation. | |
1da177e4 | 121 | */ |
3c98bf34 BP |
122 | |
123 | /* DSC timings. */ | |
1da177e4 LT |
124 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
125 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ | |
126 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ | |
127 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ | |
128 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ | |
129 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ | |
130 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ | |
131 | ||
132 | /*************************** End of tunable parameters ***********************/ | |
133 | ||
54abf37e BP |
134 | /* tape directions */ |
135 | enum { | |
136 | IDETAPE_DIR_NONE = (1 << 0), | |
137 | IDETAPE_DIR_READ = (1 << 1), | |
138 | IDETAPE_DIR_WRITE = (1 << 2), | |
139 | }; | |
1da177e4 LT |
140 | |
141 | struct idetape_bh { | |
ab057968 | 142 | u32 b_size; |
1da177e4 LT |
143 | atomic_t b_count; |
144 | struct idetape_bh *b_reqnext; | |
145 | char *b_data; | |
146 | }; | |
147 | ||
03056b90 BP |
148 | /* Tape door status */ |
149 | #define DOOR_UNLOCKED 0 | |
150 | #define DOOR_LOCKED 1 | |
151 | #define DOOR_EXPLICITLY_LOCKED 2 | |
152 | ||
153 | /* Some defines for the SPACE command */ | |
154 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
155 | #define IDETAPE_SPACE_TO_EOD 3 | |
156 | ||
157 | /* Some defines for the LOAD UNLOAD command */ | |
158 | #define IDETAPE_LU_LOAD_MASK 1 | |
159 | #define IDETAPE_LU_RETENSION_MASK 2 | |
160 | #define IDETAPE_LU_EOT_MASK 4 | |
161 | ||
162 | /* | |
163 | * Special requests for our block device strategy routine. | |
164 | * | |
165 | * In order to service a character device command, we add special requests to | |
166 | * the tail of our block device request queue and wait for their completion. | |
167 | */ | |
168 | ||
169 | enum { | |
170 | REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ | |
171 | REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ | |
172 | REQ_IDETAPE_READ = (1 << 2), | |
173 | REQ_IDETAPE_WRITE = (1 << 3), | |
174 | }; | |
175 | ||
176 | /* Error codes returned in rq->errors to the higher part of the driver. */ | |
177 | #define IDETAPE_ERROR_GENERAL 101 | |
178 | #define IDETAPE_ERROR_FILEMARK 102 | |
179 | #define IDETAPE_ERROR_EOD 103 | |
180 | ||
181 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ | |
182 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
183 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
184 | ||
1da177e4 | 185 | /* |
3c98bf34 BP |
186 | * Most of our global data which we need to save even as we leave the driver due |
187 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
188 | */ |
189 | typedef struct ide_tape_obj { | |
190 | ide_drive_t *drive; | |
191 | ide_driver_t *driver; | |
192 | struct gendisk *disk; | |
193 | struct kref kref; | |
194 | ||
195 | /* | |
1da177e4 LT |
196 | * pc points to the current processed packet command. |
197 | * | |
198 | * failed_pc points to the last failed packet command, or contains | |
199 | * NULL if we do not need to retry any packet command. This is | |
200 | * required since an additional packet command is needed before the | |
201 | * retry, to get detailed information on what went wrong. | |
202 | */ | |
203 | /* Current packet command */ | |
d236d74c | 204 | struct ide_atapi_pc *pc; |
1da177e4 | 205 | /* Last failed packet command */ |
d236d74c | 206 | struct ide_atapi_pc *failed_pc; |
2e8a6f89 BZ |
207 | /* used by REQ_IDETAPE_{READ,WRITE} requests */ |
208 | struct ide_atapi_pc queued_pc; | |
394a4c21 | 209 | |
2e8a6f89 | 210 | struct ide_atapi_pc request_sense_pc; |
394a4c21 | 211 | struct request request_sense_rq; |
1da177e4 LT |
212 | |
213 | /* | |
3c98bf34 | 214 | * DSC polling variables. |
1da177e4 | 215 | * |
3c98bf34 BP |
216 | * While polling for DSC we use postponed_rq to postpone the current |
217 | * request so that ide.c will be able to service pending requests on the | |
218 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 219 | * data transfer) request in the device request queue. |
1da177e4 LT |
220 | */ |
221 | struct request *postponed_rq; | |
222 | /* The time in which we started polling for DSC */ | |
223 | unsigned long dsc_polling_start; | |
224 | /* Timer used to poll for dsc */ | |
225 | struct timer_list dsc_timer; | |
226 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
227 | unsigned long best_dsc_rw_freq; |
228 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
229 | unsigned long dsc_timeout; |
230 | ||
3c98bf34 | 231 | /* Read position information */ |
1da177e4 LT |
232 | u8 partition; |
233 | /* Current block */ | |
54bb2074 | 234 | unsigned int first_frame; |
1da177e4 | 235 | |
3c98bf34 | 236 | /* Last error information */ |
1da177e4 LT |
237 | u8 sense_key, asc, ascq; |
238 | ||
3c98bf34 | 239 | /* Character device operation */ |
1da177e4 LT |
240 | unsigned int minor; |
241 | /* device name */ | |
242 | char name[4]; | |
243 | /* Current character device data transfer direction */ | |
54abf37e | 244 | u8 chrdev_dir; |
1da177e4 | 245 | |
54bb2074 BP |
246 | /* tape block size, usually 512 or 1024 bytes */ |
247 | unsigned short blk_size; | |
1da177e4 | 248 | int user_bs_factor; |
b6422013 | 249 | |
1da177e4 | 250 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 251 | u8 caps[20]; |
1da177e4 LT |
252 | |
253 | /* | |
3c98bf34 | 254 | * Active data transfer request parameters. |
1da177e4 | 255 | * |
3c98bf34 BP |
256 | * At most, there is only one ide-tape originated data transfer request |
257 | * in the device request queue. This allows ide.c to easily service | |
258 | * requests from the other device when we postpone our active request. | |
1da177e4 | 259 | */ |
83042b24 | 260 | |
3c98bf34 | 261 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 262 | int buffer_size; |
077e3bdb BP |
263 | /* merge buffer */ |
264 | struct idetape_bh *merge_bh; | |
01a63aeb BP |
265 | /* size of the merge buffer */ |
266 | int merge_bh_size; | |
077e3bdb | 267 | /* pointer to current buffer head within the merge buffer */ |
1da177e4 LT |
268 | struct idetape_bh *bh; |
269 | char *b_data; | |
270 | int b_count; | |
3c98bf34 | 271 | |
a997a435 | 272 | int pages_per_buffer; |
1da177e4 LT |
273 | /* Wasted space in each stage */ |
274 | int excess_bh_size; | |
275 | ||
1da177e4 | 276 | /* protects the ide-tape queue */ |
54bb2074 | 277 | spinlock_t lock; |
1da177e4 | 278 | |
3c98bf34 | 279 | /* Measures average tape speed */ |
1da177e4 LT |
280 | unsigned long avg_time; |
281 | int avg_size; | |
282 | int avg_speed; | |
283 | ||
1da177e4 LT |
284 | /* the door is currently locked */ |
285 | int door_locked; | |
286 | /* the tape hardware is write protected */ | |
287 | char drv_write_prot; | |
288 | /* the tape is write protected (hardware or opened as read-only) */ | |
289 | char write_prot; | |
290 | ||
8004a8c9 | 291 | u32 debug_mask; |
1da177e4 LT |
292 | } idetape_tape_t; |
293 | ||
cf8b8975 | 294 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 295 | |
d5dee80a WD |
296 | static struct class *idetape_sysfs_class; |
297 | ||
1da177e4 LT |
298 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
299 | ||
300 | #define ide_tape_g(disk) \ | |
301 | container_of((disk)->private_data, struct ide_tape_obj, driver) | |
302 | ||
08da591e BZ |
303 | static void ide_tape_release(struct kref *); |
304 | ||
1da177e4 LT |
305 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
306 | { | |
307 | struct ide_tape_obj *tape = NULL; | |
308 | ||
cf8b8975 | 309 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 310 | tape = ide_tape_g(disk); |
08da591e | 311 | if (tape) { |
d3e33ff5 | 312 | if (ide_device_get(tape->drive)) |
08da591e | 313 | tape = NULL; |
d3e33ff5 BZ |
314 | else |
315 | kref_get(&tape->kref); | |
08da591e | 316 | } |
cf8b8975 | 317 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
318 | return tape; |
319 | } | |
320 | ||
1da177e4 LT |
321 | static void ide_tape_put(struct ide_tape_obj *tape) |
322 | { | |
d3e33ff5 BZ |
323 | ide_drive_t *drive = tape->drive; |
324 | ||
cf8b8975 | 325 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 326 | kref_put(&tape->kref, ide_tape_release); |
d3e33ff5 | 327 | ide_device_put(drive); |
cf8b8975 | 328 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
329 | } |
330 | ||
1da177e4 | 331 | /* |
3c98bf34 BP |
332 | * The variables below are used for the character device interface. Additional |
333 | * state variables are defined in our ide_drive_t structure. | |
1da177e4 | 334 | */ |
5a04cfa9 | 335 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
1da177e4 LT |
336 | |
337 | #define ide_tape_f(file) ((file)->private_data) | |
338 | ||
339 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) | |
340 | { | |
341 | struct ide_tape_obj *tape = NULL; | |
342 | ||
cf8b8975 | 343 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
344 | tape = idetape_devs[i]; |
345 | if (tape) | |
346 | kref_get(&tape->kref); | |
cf8b8975 | 347 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
348 | return tape; |
349 | } | |
350 | ||
d236d74c | 351 | static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 352 | unsigned int bcount) |
1da177e4 LT |
353 | { |
354 | struct idetape_bh *bh = pc->bh; | |
355 | int count; | |
356 | ||
357 | while (bcount) { | |
1da177e4 LT |
358 | if (bh == NULL) { |
359 | printk(KERN_ERR "ide-tape: bh == NULL in " | |
360 | "idetape_input_buffers\n"); | |
9f87abe8 | 361 | ide_pad_transfer(drive, 0, bcount); |
1da177e4 LT |
362 | return; |
363 | } | |
5a04cfa9 BP |
364 | count = min( |
365 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
366 | bcount); | |
374e042c | 367 | drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data + |
5a04cfa9 | 368 | atomic_read(&bh->b_count), count); |
1da177e4 LT |
369 | bcount -= count; |
370 | atomic_add(count, &bh->b_count); | |
371 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
372 | bh = bh->b_reqnext; | |
373 | if (bh) | |
374 | atomic_set(&bh->b_count, 0); | |
375 | } | |
376 | } | |
377 | pc->bh = bh; | |
378 | } | |
379 | ||
d236d74c | 380 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 381 | unsigned int bcount) |
1da177e4 LT |
382 | { |
383 | struct idetape_bh *bh = pc->bh; | |
384 | int count; | |
385 | ||
386 | while (bcount) { | |
1da177e4 | 387 | if (bh == NULL) { |
5a04cfa9 BP |
388 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
389 | __func__); | |
1da177e4 LT |
390 | return; |
391 | } | |
1da177e4 | 392 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
374e042c | 393 | drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); |
1da177e4 LT |
394 | bcount -= count; |
395 | pc->b_data += count; | |
396 | pc->b_count -= count; | |
397 | if (!pc->b_count) { | |
5a04cfa9 BP |
398 | bh = bh->b_reqnext; |
399 | pc->bh = bh; | |
1da177e4 LT |
400 | if (bh) { |
401 | pc->b_data = bh->b_data; | |
402 | pc->b_count = atomic_read(&bh->b_count); | |
403 | } | |
404 | } | |
405 | } | |
406 | } | |
407 | ||
646c0cb6 | 408 | static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
409 | { |
410 | struct idetape_bh *bh = pc->bh; | |
411 | int count; | |
d236d74c | 412 | unsigned int bcount = pc->xferred; |
1da177e4 | 413 | |
346331f8 | 414 | if (pc->flags & PC_FLAG_WRITING) |
1da177e4 LT |
415 | return; |
416 | while (bcount) { | |
1da177e4 | 417 | if (bh == NULL) { |
5a04cfa9 BP |
418 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
419 | __func__); | |
1da177e4 LT |
420 | return; |
421 | } | |
1da177e4 LT |
422 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
423 | atomic_set(&bh->b_count, count); | |
424 | if (atomic_read(&bh->b_count) == bh->b_size) | |
425 | bh = bh->b_reqnext; | |
426 | bcount -= count; | |
427 | } | |
428 | pc->bh = bh; | |
429 | } | |
430 | ||
1da177e4 | 431 | /* |
1b5db434 BP |
432 | * called on each failed packet command retry to analyze the request sense. We |
433 | * currently do not utilize this information. | |
1da177e4 | 434 | */ |
1b5db434 | 435 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
436 | { |
437 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 438 | struct ide_atapi_pc *pc = tape->failed_pc; |
1da177e4 | 439 | |
1b5db434 BP |
440 | tape->sense_key = sense[2] & 0xF; |
441 | tape->asc = sense[12]; | |
442 | tape->ascq = sense[13]; | |
8004a8c9 BP |
443 | |
444 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
445 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 446 | |
d236d74c | 447 | /* Correct pc->xferred by asking the tape. */ |
346331f8 | 448 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
d236d74c | 449 | pc->xferred = pc->req_xfer - |
54bb2074 | 450 | tape->blk_size * |
5d0cc8ae | 451 | get_unaligned_be32(&sense[3]); |
646c0cb6 | 452 | idetape_update_buffers(drive, pc); |
1da177e4 LT |
453 | } |
454 | ||
455 | /* | |
456 | * If error was the result of a zero-length read or write command, | |
457 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
458 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
459 | */ | |
90699ce2 | 460 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
461 | /* length == 0 */ |
462 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
463 | if (tape->sense_key == 5) { | |
1da177e4 LT |
464 | /* don't report an error, everything's ok */ |
465 | pc->error = 0; | |
466 | /* don't retry read/write */ | |
346331f8 | 467 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
468 | } |
469 | } | |
90699ce2 | 470 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
1da177e4 | 471 | pc->error = IDETAPE_ERROR_FILEMARK; |
346331f8 | 472 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 473 | } |
90699ce2 | 474 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
475 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
476 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
1da177e4 | 477 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 478 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
479 | } |
480 | } | |
90699ce2 | 481 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 482 | if (tape->sense_key == 8) { |
1da177e4 | 483 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 484 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 485 | } |
346331f8 | 486 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 487 | pc->xferred) |
1da177e4 LT |
488 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
489 | } | |
490 | } | |
491 | ||
d01dbc3b | 492 | /* Free data buffers completely. */ |
077e3bdb | 493 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) |
1da177e4 | 494 | { |
077e3bdb | 495 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; |
d01dbc3b BP |
496 | |
497 | while (bh) { | |
498 | u32 size = bh->b_size; | |
499 | ||
500 | while (size) { | |
501 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
502 | ||
503 | if (bh->b_data) | |
504 | free_pages((unsigned long)bh->b_data, order); | |
505 | ||
506 | size &= (order-1); | |
507 | bh->b_data += (1 << order) * PAGE_SIZE; | |
1da177e4 LT |
508 | } |
509 | prev_bh = bh; | |
510 | bh = bh->b_reqnext; | |
511 | kfree(prev_bh); | |
512 | } | |
1da177e4 LT |
513 | } |
514 | ||
1da177e4 LT |
515 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
516 | { | |
517 | struct request *rq = HWGROUP(drive)->rq; | |
518 | idetape_tape_t *tape = drive->driver_data; | |
519 | unsigned long flags; | |
520 | int error; | |
1da177e4 | 521 | |
8004a8c9 | 522 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
523 | |
524 | switch (uptodate) { | |
5a04cfa9 BP |
525 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
526 | case 1: error = 0; break; | |
527 | default: error = uptodate; | |
1da177e4 LT |
528 | } |
529 | rq->errors = error; | |
530 | if (error) | |
531 | tape->failed_pc = NULL; | |
532 | ||
3687221f BZ |
533 | if (!blk_special_request(rq)) { |
534 | ide_end_request(drive, uptodate, nr_sects); | |
535 | return 0; | |
536 | } | |
537 | ||
54bb2074 | 538 | spin_lock_irqsave(&tape->lock, flags); |
1da177e4 | 539 | |
1da177e4 | 540 | ide_end_drive_cmd(drive, 0, 0); |
1da177e4 | 541 | |
54bb2074 | 542 | spin_unlock_irqrestore(&tape->lock, flags); |
1da177e4 LT |
543 | return 0; |
544 | } | |
545 | ||
92f5daff | 546 | static void ide_tape_callback(ide_drive_t *drive) |
1da177e4 LT |
547 | { |
548 | idetape_tape_t *tape = drive->driver_data; | |
5985e6ab BZ |
549 | struct ide_atapi_pc *pc = tape->pc; |
550 | int uptodate = pc->error ? 0 : 1; | |
1da177e4 | 551 | |
8004a8c9 BP |
552 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
553 | ||
dd2e9a03 BZ |
554 | if (tape->failed_pc == pc) |
555 | tape->failed_pc = NULL; | |
556 | ||
5985e6ab BZ |
557 | if (pc->c[0] == REQUEST_SENSE) { |
558 | if (uptodate) | |
559 | idetape_analyze_error(drive, pc->buf); | |
560 | else | |
561 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
562 | "itself - Aborting request!\n"); | |
563 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
564 | struct request *rq = drive->hwif->hwgroup->rq; | |
565 | int blocks = pc->xferred / tape->blk_size; | |
566 | ||
567 | tape->avg_size += blocks * tape->blk_size; | |
568 | ||
569 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
570 | tape->avg_speed = tape->avg_size * HZ / | |
571 | (jiffies - tape->avg_time) / 1024; | |
572 | tape->avg_size = 0; | |
573 | tape->avg_time = jiffies; | |
574 | } | |
575 | ||
576 | tape->first_frame += blocks; | |
577 | rq->current_nr_sectors -= blocks; | |
578 | ||
579 | if (pc->error) | |
580 | uptodate = pc->error; | |
581 | } else if (pc->c[0] == READ_POSITION && uptodate) { | |
582 | u8 *readpos = tape->pc->buf; | |
583 | ||
584 | debug_log(DBG_SENSE, "BOP - %s\n", | |
585 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
586 | debug_log(DBG_SENSE, "EOP - %s\n", | |
587 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
588 | ||
589 | if (readpos[0] & 0x4) { | |
590 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
591 | "to the tape\n"); | |
f2e3ab52 | 592 | clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab BZ |
593 | uptodate = 0; |
594 | } else { | |
595 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
cd740ab0 | 596 | be32_to_cpup((__be32 *)&readpos[4])); |
5985e6ab BZ |
597 | |
598 | tape->partition = readpos[1]; | |
cd740ab0 | 599 | tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); |
f2e3ab52 | 600 | set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 601 | } |
1da177e4 | 602 | } |
5985e6ab BZ |
603 | |
604 | idetape_end_request(drive, uptodate, 0); | |
1da177e4 LT |
605 | } |
606 | ||
d236d74c | 607 | static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 608 | { |
7bf7420a | 609 | ide_init_pc(pc); |
90699ce2 | 610 | pc->c[0] = REQUEST_SENSE; |
1da177e4 | 611 | pc->c[4] = 20; |
d236d74c | 612 | pc->req_xfer = 20; |
1da177e4 LT |
613 | } |
614 | ||
1da177e4 | 615 | /* |
3c98bf34 BP |
616 | * Generate a new packet command request in front of the request queue, before |
617 | * the current request, so that it will be processed immediately, on the next | |
394a4c21 | 618 | * pass through the driver. |
1da177e4 | 619 | */ |
d236d74c | 620 | static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 621 | struct request *rq) |
1da177e4 LT |
622 | { |
623 | struct ide_tape_obj *tape = drive->driver_data; | |
624 | ||
f025ffdc BZ |
625 | blk_rq_init(NULL, rq); |
626 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
e8a96aa7 | 627 | rq->cmd_flags |= REQ_PREEMPT; |
1da177e4 LT |
628 | rq->buffer = (char *) pc; |
629 | rq->rq_disk = tape->disk; | |
0014c75b | 630 | memcpy(rq->cmd, pc->c, 12); |
f025ffdc | 631 | rq->cmd[13] = REQ_IDETAPE_PC1; |
63f5abb0 | 632 | ide_do_drive_cmd(drive, rq); |
1da177e4 LT |
633 | } |
634 | ||
635 | /* | |
636 | * idetape_retry_pc is called when an error was detected during the | |
637 | * last packet command. We queue a request sense packet command in | |
638 | * the head of the request list. | |
639 | */ | |
258ec411 | 640 | static void idetape_retry_pc(ide_drive_t *drive) |
1da177e4 | 641 | { |
394a4c21 BZ |
642 | struct ide_tape_obj *tape = drive->driver_data; |
643 | struct request *rq = &tape->request_sense_rq; | |
2e8a6f89 | 644 | struct ide_atapi_pc *pc = &tape->request_sense_pc; |
1da177e4 | 645 | |
64a57fe4 | 646 | (void)ide_read_error(drive); |
1da177e4 | 647 | idetape_create_request_sense_cmd(pc); |
f2e3ab52 | 648 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 | 649 | idetape_queue_pc_head(drive, pc, rq); |
1da177e4 LT |
650 | } |
651 | ||
652 | /* | |
3c98bf34 BP |
653 | * Postpone the current request so that ide.c will be able to service requests |
654 | * from another device on the same hwgroup while we are polling for DSC. | |
1da177e4 | 655 | */ |
5a04cfa9 | 656 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
657 | { |
658 | idetape_tape_t *tape = drive->driver_data; | |
659 | ||
8004a8c9 BP |
660 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
661 | ||
1da177e4 | 662 | tape->postponed_rq = HWGROUP(drive)->rq; |
54bb2074 | 663 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
664 | } |
665 | ||
74e63e74 BZ |
666 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
667 | { | |
668 | idetape_tape_t *tape = drive->driver_data; | |
669 | ||
670 | /* Media access command */ | |
671 | tape->dsc_polling_start = jiffies; | |
672 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
673 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
674 | /* Allow ide.c to handle other requests */ | |
675 | idetape_postpone_request(drive); | |
676 | } | |
677 | ||
acaa0f5f | 678 | static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
08424ac2 BZ |
679 | unsigned int bcount, int write) |
680 | { | |
681 | if (write) | |
682 | idetape_output_buffers(drive, pc, bcount); | |
683 | else | |
684 | idetape_input_buffers(drive, pc, bcount); | |
acaa0f5f BZ |
685 | |
686 | return bcount; | |
08424ac2 | 687 | } |
a1efc85f | 688 | |
1da177e4 | 689 | /* |
a1efc85f BP |
690 | * This is the usual interrupt handler which will be called during a packet |
691 | * command. We will transfer some of the data (as requested by the drive) and | |
692 | * will re-point interrupt handler to us. When data transfer is finished, we | |
693 | * will act according to the algorithm described before | |
8d06bfad | 694 | * idetape_issue_pc. |
1da177e4 | 695 | */ |
a1efc85f | 696 | static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) |
1da177e4 | 697 | { |
1da177e4 | 698 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 699 | |
646c0cb6 BZ |
700 | return ide_pc_intr(drive, tape->pc, idetape_pc_intr, IDETAPE_WAIT_CMD, |
701 | NULL, idetape_update_buffers, idetape_retry_pc, | |
702 | ide_tape_handle_dsc, ide_tape_io_buffers); | |
1da177e4 LT |
703 | } |
704 | ||
705 | /* | |
3c98bf34 | 706 | * Packet Command Interface |
1da177e4 | 707 | * |
3c98bf34 BP |
708 | * The current Packet Command is available in tape->pc, and will not change |
709 | * until we finish handling it. Each packet command is associated with a | |
710 | * callback function that will be called when the command is finished. | |
1da177e4 | 711 | * |
3c98bf34 | 712 | * The handling will be done in three stages: |
1da177e4 | 713 | * |
3c98bf34 BP |
714 | * 1. idetape_issue_pc will send the packet command to the drive, and will set |
715 | * the interrupt handler to idetape_pc_intr. | |
1da177e4 | 716 | * |
3c98bf34 BP |
717 | * 2. On each interrupt, idetape_pc_intr will be called. This step will be |
718 | * repeated until the device signals us that no more interrupts will be issued. | |
1da177e4 | 719 | * |
3c98bf34 BP |
720 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
721 | * process. In case of a successful initiation of a media access packet command, | |
722 | * the DSC bit will be set when the actual execution of the command is finished. | |
723 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
724 | * event. In this case, we define the request as "low priority request" by | |
725 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
726 | * exit the driver. | |
1da177e4 | 727 | * |
3c98bf34 BP |
728 | * ide.c will then give higher priority to requests which originate from the |
729 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 730 | * |
3c98bf34 | 731 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 732 | * |
3c98bf34 BP |
733 | * 5. In case an error was found, we queue a request sense packet command in |
734 | * front of the request queue and retry the operation up to | |
735 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 736 | * |
3c98bf34 BP |
737 | * 6. In case no error was found, or we decided to give up and not to retry |
738 | * again, the callback function will be called and then we will handle the next | |
739 | * request. | |
1da177e4 LT |
740 | */ |
741 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) | |
742 | { | |
1da177e4 | 743 | idetape_tape_t *tape = drive->driver_data; |
9567b349 | 744 | |
594c16d8 BZ |
745 | return ide_transfer_pc(drive, tape->pc, idetape_pc_intr, |
746 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
747 | } |
748 | ||
d236d74c BP |
749 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
750 | struct ide_atapi_pc *pc) | |
1da177e4 | 751 | { |
1da177e4 | 752 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 753 | |
90699ce2 BP |
754 | if (tape->pc->c[0] == REQUEST_SENSE && |
755 | pc->c[0] == REQUEST_SENSE) { | |
1da177e4 LT |
756 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
757 | "Two request sense in serial were issued\n"); | |
758 | } | |
1da177e4 | 759 | |
90699ce2 | 760 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
1da177e4 LT |
761 | tape->failed_pc = pc; |
762 | /* Set the current packet command */ | |
763 | tape->pc = pc; | |
764 | ||
765 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 766 | (pc->flags & PC_FLAG_ABORT)) { |
1da177e4 | 767 | /* |
3c98bf34 BP |
768 | * We will "abort" retrying a packet command in case legitimate |
769 | * error code was received (crossing a filemark, or end of the | |
770 | * media, for example). | |
1da177e4 | 771 | */ |
346331f8 | 772 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 773 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
774 | tape->sense_key == 2 && tape->asc == 4 && |
775 | (tape->ascq == 1 || tape->ascq == 8))) { | |
776 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
777 | "pc = %2x, key = %2x, " | |
778 | "asc = %2x, ascq = %2x\n", | |
779 | tape->name, pc->c[0], | |
780 | tape->sense_key, tape->asc, | |
781 | tape->ascq); | |
782 | } | |
783 | /* Giving up */ | |
784 | pc->error = IDETAPE_ERROR_GENERAL; | |
785 | } | |
786 | tape->failed_pc = NULL; | |
776bb027 | 787 | drive->pc_callback(drive); |
92f5daff | 788 | return ide_stopped; |
1da177e4 | 789 | } |
8004a8c9 | 790 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
791 | |
792 | pc->retries++; | |
1da177e4 | 793 | |
6bf1641c BZ |
794 | return ide_issue_pc(drive, pc, idetape_transfer_pc, |
795 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
796 | } |
797 | ||
3c98bf34 | 798 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 799 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 | 800 | { |
7bf7420a | 801 | ide_init_pc(pc); |
90699ce2 | 802 | pc->c[0] = MODE_SENSE; |
1da177e4 | 803 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
804 | /* DBD = 1 - Don't return block descriptors */ |
805 | pc->c[1] = 8; | |
1da177e4 LT |
806 | pc->c[2] = page_code; |
807 | /* | |
808 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
809 | * | |
810 | * For SCSI this byte is defined as subpage instead of high byte | |
811 | * of length and some IDE drives seem to interpret it this way | |
812 | * and return an error when 255 is used. | |
813 | */ | |
814 | pc->c[3] = 0; | |
3c98bf34 BP |
815 | /* We will just discard data in that case */ |
816 | pc->c[4] = 255; | |
1da177e4 | 817 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 818 | pc->req_xfer = 12; |
1da177e4 | 819 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 820 | pc->req_xfer = 24; |
1da177e4 | 821 | else |
d236d74c | 822 | pc->req_xfer = 50; |
1da177e4 LT |
823 | } |
824 | ||
5a04cfa9 | 825 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 826 | { |
b73c7ee2 | 827 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 828 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 829 | struct ide_atapi_pc *pc = tape->pc; |
22c525b9 | 830 | u8 stat; |
1da177e4 | 831 | |
374e042c | 832 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 833 | |
3a7d2484 BZ |
834 | if (stat & ATA_DSC) { |
835 | if (stat & ATA_ERR) { | |
1da177e4 | 836 | /* Error detected */ |
90699ce2 | 837 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
838 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
839 | tape->name); | |
840 | /* Retry operation */ | |
258ec411 BZ |
841 | idetape_retry_pc(drive); |
842 | return ide_stopped; | |
1da177e4 LT |
843 | } |
844 | pc->error = 0; | |
1da177e4 LT |
845 | } else { |
846 | pc->error = IDETAPE_ERROR_GENERAL; | |
847 | tape->failed_pc = NULL; | |
848 | } | |
776bb027 | 849 | drive->pc_callback(drive); |
1da177e4 LT |
850 | return ide_stopped; |
851 | } | |
852 | ||
cd2abbfe | 853 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
854 | struct ide_atapi_pc *pc, struct request *rq, |
855 | u8 opcode) | |
1da177e4 | 856 | { |
0014c75b BP |
857 | struct idetape_bh *bh = (struct idetape_bh *)rq->special; |
858 | unsigned int length = rq->current_nr_sectors; | |
859 | ||
7bf7420a | 860 | ide_init_pc(pc); |
860ff5ec | 861 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 862 | pc->c[1] = 1; |
1da177e4 | 863 | pc->bh = bh; |
d236d74c BP |
864 | pc->buf = NULL; |
865 | pc->buf_size = length * tape->blk_size; | |
866 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 867 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 868 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 869 | |
cd2abbfe BP |
870 | if (opcode == READ_6) { |
871 | pc->c[0] = READ_6; | |
872 | atomic_set(&bh->b_count, 0); | |
873 | } else if (opcode == WRITE_6) { | |
874 | pc->c[0] = WRITE_6; | |
875 | pc->flags |= PC_FLAG_WRITING; | |
876 | pc->b_data = bh->b_data; | |
877 | pc->b_count = atomic_read(&bh->b_count); | |
878 | } | |
0014c75b BP |
879 | |
880 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
881 | } |
882 | ||
1da177e4 LT |
883 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
884 | struct request *rq, sector_t block) | |
885 | { | |
b73c7ee2 | 886 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 887 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 888 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 889 | struct request *postponed_rq = tape->postponed_rq; |
22c525b9 | 890 | u8 stat; |
1da177e4 | 891 | |
730616b2 MW |
892 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu," |
893 | " current_nr_sectors: %u\n", | |
894 | (unsigned long long)rq->sector, rq->nr_sectors, | |
895 | rq->current_nr_sectors); | |
1da177e4 | 896 | |
4aff5e23 | 897 | if (!blk_special_request(rq)) { |
3c98bf34 | 898 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 899 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 900 | "request queue (%d)\n", drive->name, rq->cmd_type); |
1da177e4 LT |
901 | ide_end_request(drive, 0, 0); |
902 | return ide_stopped; | |
903 | } | |
904 | ||
3c98bf34 | 905 | /* Retry a failed packet command */ |
28c7214b BZ |
906 | if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) { |
907 | pc = tape->failed_pc; | |
908 | goto out; | |
909 | } | |
5a04cfa9 | 910 | |
1da177e4 LT |
911 | if (postponed_rq != NULL) |
912 | if (rq != postponed_rq) { | |
913 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
914 | "Two DSC requests were queued\n"); | |
915 | idetape_end_request(drive, 0, 0); | |
916 | return ide_stopped; | |
917 | } | |
1da177e4 LT |
918 | |
919 | tape->postponed_rq = NULL; | |
920 | ||
921 | /* | |
922 | * If the tape is still busy, postpone our request and service | |
923 | * the other device meanwhile. | |
924 | */ | |
374e042c | 925 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 926 | |
83dd5735 | 927 | if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2)) |
f2e3ab52 | 928 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 LT |
929 | |
930 | if (drive->post_reset == 1) { | |
f2e3ab52 | 931 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 LT |
932 | drive->post_reset = 0; |
933 | } | |
934 | ||
f2e3ab52 | 935 | if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && |
3a7d2484 | 936 | (stat & ATA_DSC) == 0) { |
1da177e4 LT |
937 | if (postponed_rq == NULL) { |
938 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 939 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
940 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
941 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
942 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
943 | tape->name); | |
83dd5735 | 944 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
945 | idetape_media_access_finished(drive); |
946 | return ide_stopped; | |
947 | } else { | |
948 | return ide_do_reset(drive); | |
949 | } | |
5a04cfa9 BP |
950 | } else if (time_after(jiffies, |
951 | tape->dsc_polling_start + | |
952 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 953 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
954 | idetape_postpone_request(drive); |
955 | return ide_stopped; | |
956 | } | |
83dd5735 | 957 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
2e8a6f89 | 958 | pc = &tape->queued_pc; |
0014c75b | 959 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
960 | goto out; |
961 | } | |
83dd5735 | 962 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
2e8a6f89 | 963 | pc = &tape->queued_pc; |
0014c75b | 964 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
965 | goto out; |
966 | } | |
83dd5735 | 967 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
d236d74c | 968 | pc = (struct ide_atapi_pc *) rq->buffer; |
83dd5735 BP |
969 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
970 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
971 | goto out; |
972 | } | |
83dd5735 | 973 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
974 | idetape_media_access_finished(drive); |
975 | return ide_stopped; | |
976 | } | |
977 | BUG(); | |
28c7214b | 978 | |
f2e3ab52 | 979 | out: |
8d06bfad | 980 | return idetape_issue_pc(drive, pc); |
1da177e4 LT |
981 | } |
982 | ||
1da177e4 | 983 | /* |
41aa1706 | 984 | * The function below uses __get_free_pages to allocate a data buffer of size |
f73850a3 | 985 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
3c98bf34 | 986 | * much as possible. |
1da177e4 | 987 | * |
41aa1706 BP |
988 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
989 | * failure. | |
1da177e4 | 990 | */ |
077e3bdb BP |
991 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, |
992 | int full, int clear) | |
1da177e4 | 993 | { |
077e3bdb | 994 | struct idetape_bh *prev_bh, *bh, *merge_bh; |
a997a435 | 995 | int pages = tape->pages_per_buffer; |
41aa1706 | 996 | unsigned int order, b_allocd; |
1da177e4 LT |
997 | char *b_data = NULL; |
998 | ||
077e3bdb BP |
999 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1000 | bh = merge_bh; | |
1da177e4 LT |
1001 | if (bh == NULL) |
1002 | goto abort; | |
41aa1706 BP |
1003 | |
1004 | order = fls(pages) - 1; | |
1005 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 1006 | if (!bh->b_data) |
1da177e4 | 1007 | goto abort; |
41aa1706 BP |
1008 | b_allocd = (1 << order) * PAGE_SIZE; |
1009 | pages &= (order-1); | |
1010 | ||
1da177e4 | 1011 | if (clear) |
41aa1706 BP |
1012 | memset(bh->b_data, 0, b_allocd); |
1013 | bh->b_reqnext = NULL; | |
1014 | bh->b_size = b_allocd; | |
1da177e4 LT |
1015 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1016 | ||
41aa1706 BP |
1017 | while (pages) { |
1018 | order = fls(pages) - 1; | |
1019 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 1020 | if (!b_data) |
1da177e4 | 1021 | goto abort; |
41aa1706 BP |
1022 | b_allocd = (1 << order) * PAGE_SIZE; |
1023 | ||
1da177e4 | 1024 | if (clear) |
41aa1706 BP |
1025 | memset(b_data, 0, b_allocd); |
1026 | ||
1027 | /* newly allocated page frames below buffer header or ...*/ | |
1028 | if (bh->b_data == b_data + b_allocd) { | |
1029 | bh->b_size += b_allocd; | |
1030 | bh->b_data -= b_allocd; | |
1da177e4 | 1031 | if (full) |
41aa1706 | 1032 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1033 | continue; |
1034 | } | |
41aa1706 | 1035 | /* they are above the header */ |
1da177e4 | 1036 | if (b_data == bh->b_data + bh->b_size) { |
41aa1706 | 1037 | bh->b_size += b_allocd; |
1da177e4 | 1038 | if (full) |
41aa1706 | 1039 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1040 | continue; |
1041 | } | |
1042 | prev_bh = bh; | |
5a04cfa9 BP |
1043 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1044 | if (!bh) { | |
41aa1706 | 1045 | free_pages((unsigned long) b_data, order); |
1da177e4 LT |
1046 | goto abort; |
1047 | } | |
1048 | bh->b_reqnext = NULL; | |
1049 | bh->b_data = b_data; | |
41aa1706 | 1050 | bh->b_size = b_allocd; |
1da177e4 LT |
1051 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1052 | prev_bh->b_reqnext = bh; | |
41aa1706 BP |
1053 | |
1054 | pages &= (order-1); | |
1da177e4 | 1055 | } |
41aa1706 | 1056 | |
1da177e4 LT |
1057 | bh->b_size -= tape->excess_bh_size; |
1058 | if (full) | |
1059 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
077e3bdb | 1060 | return merge_bh; |
1da177e4 | 1061 | abort: |
077e3bdb | 1062 | ide_tape_kfree_buffer(tape); |
1da177e4 LT |
1063 | return NULL; |
1064 | } | |
1065 | ||
5a04cfa9 | 1066 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
8646c88f | 1067 | const char __user *buf, int n) |
1da177e4 LT |
1068 | { |
1069 | struct idetape_bh *bh = tape->bh; | |
1070 | int count; | |
dcd96379 | 1071 | int ret = 0; |
1da177e4 LT |
1072 | |
1073 | while (n) { | |
1da177e4 | 1074 | if (bh == NULL) { |
5a04cfa9 BP |
1075 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1076 | __func__); | |
dcd96379 | 1077 | return 1; |
1da177e4 | 1078 | } |
5a04cfa9 BP |
1079 | count = min((unsigned int) |
1080 | (bh->b_size - atomic_read(&bh->b_count)), | |
1081 | (unsigned int)n); | |
1082 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
1083 | count)) | |
dcd96379 | 1084 | ret = 1; |
1da177e4 LT |
1085 | n -= count; |
1086 | atomic_add(count, &bh->b_count); | |
1087 | buf += count; | |
1088 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
1089 | bh = bh->b_reqnext; | |
1090 | if (bh) | |
1091 | atomic_set(&bh->b_count, 0); | |
1092 | } | |
1093 | } | |
1094 | tape->bh = bh; | |
dcd96379 | 1095 | return ret; |
1da177e4 LT |
1096 | } |
1097 | ||
5a04cfa9 | 1098 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
99d74e61 | 1099 | int n) |
1da177e4 LT |
1100 | { |
1101 | struct idetape_bh *bh = tape->bh; | |
1102 | int count; | |
dcd96379 | 1103 | int ret = 0; |
1da177e4 LT |
1104 | |
1105 | while (n) { | |
1da177e4 | 1106 | if (bh == NULL) { |
5a04cfa9 BP |
1107 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1108 | __func__); | |
dcd96379 | 1109 | return 1; |
1da177e4 | 1110 | } |
1da177e4 | 1111 | count = min(tape->b_count, n); |
dcd96379 DW |
1112 | if (copy_to_user(buf, tape->b_data, count)) |
1113 | ret = 1; | |
1da177e4 LT |
1114 | n -= count; |
1115 | tape->b_data += count; | |
1116 | tape->b_count -= count; | |
1117 | buf += count; | |
1118 | if (!tape->b_count) { | |
5a04cfa9 BP |
1119 | bh = bh->b_reqnext; |
1120 | tape->bh = bh; | |
1da177e4 LT |
1121 | if (bh) { |
1122 | tape->b_data = bh->b_data; | |
1123 | tape->b_count = atomic_read(&bh->b_count); | |
1124 | } | |
1125 | } | |
1126 | } | |
dcd96379 | 1127 | return ret; |
1da177e4 LT |
1128 | } |
1129 | ||
077e3bdb | 1130 | static void idetape_init_merge_buffer(idetape_tape_t *tape) |
1da177e4 | 1131 | { |
077e3bdb BP |
1132 | struct idetape_bh *bh = tape->merge_bh; |
1133 | tape->bh = tape->merge_bh; | |
5a04cfa9 | 1134 | |
54abf37e | 1135 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 LT |
1136 | atomic_set(&bh->b_count, 0); |
1137 | else { | |
1138 | tape->b_data = bh->b_data; | |
1139 | tape->b_count = atomic_read(&bh->b_count); | |
1140 | } | |
1141 | } | |
1142 | ||
1da177e4 | 1143 | /* |
3c98bf34 BP |
1144 | * Write a filemark if write_filemark=1. Flush the device buffers without |
1145 | * writing a filemark otherwise. | |
1da177e4 | 1146 | */ |
5a04cfa9 | 1147 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 1148 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 | 1149 | { |
7bf7420a | 1150 | ide_init_pc(pc); |
90699ce2 | 1151 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 1152 | pc->c[4] = write_filemark; |
346331f8 | 1153 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1154 | } |
1155 | ||
d236d74c | 1156 | static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1157 | { |
7bf7420a | 1158 | ide_init_pc(pc); |
90699ce2 | 1159 | pc->c[0] = TEST_UNIT_READY; |
1da177e4 LT |
1160 | } |
1161 | ||
1162 | /* | |
3c98bf34 | 1163 | * We add a special packet command request to the tail of the request queue, and |
394a4c21 | 1164 | * wait for it to be serviced. |
1da177e4 | 1165 | */ |
ea1ab3d3 | 1166 | static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
1167 | { |
1168 | struct ide_tape_obj *tape = drive->driver_data; | |
64ea1b4a FT |
1169 | struct request *rq; |
1170 | int error; | |
1da177e4 | 1171 | |
64ea1b4a FT |
1172 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1173 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1174 | rq->cmd[13] = REQ_IDETAPE_PC1; |
64ea1b4a | 1175 | rq->buffer = (char *)pc; |
0014c75b | 1176 | memcpy(rq->cmd, pc->c, 12); |
64ea1b4a FT |
1177 | error = blk_execute_rq(drive->queue, tape->disk, rq, 0); |
1178 | blk_put_request(rq); | |
1179 | return error; | |
1da177e4 LT |
1180 | } |
1181 | ||
d236d74c BP |
1182 | static void idetape_create_load_unload_cmd(ide_drive_t *drive, |
1183 | struct ide_atapi_pc *pc, int cmd) | |
1da177e4 | 1184 | { |
7bf7420a | 1185 | ide_init_pc(pc); |
90699ce2 | 1186 | pc->c[0] = START_STOP; |
1da177e4 | 1187 | pc->c[4] = cmd; |
346331f8 | 1188 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1189 | } |
1190 | ||
1191 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) | |
1192 | { | |
1193 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1194 | struct ide_atapi_pc pc; |
1da177e4 LT |
1195 | int load_attempted = 0; |
1196 | ||
3c98bf34 | 1197 | /* Wait for the tape to become ready */ |
f2e3ab52 | 1198 | set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
1da177e4 LT |
1199 | timeout += jiffies; |
1200 | while (time_before(jiffies, timeout)) { | |
1201 | idetape_create_test_unit_ready_cmd(&pc); | |
ea1ab3d3 | 1202 | if (!idetape_queue_pc_tail(drive, &pc)) |
1da177e4 LT |
1203 | return 0; |
1204 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
1205 | || (tape->asc == 0x3A)) { |
1206 | /* no media */ | |
1da177e4 LT |
1207 | if (load_attempted) |
1208 | return -ENOMEDIUM; | |
5a04cfa9 BP |
1209 | idetape_create_load_unload_cmd(drive, &pc, |
1210 | IDETAPE_LU_LOAD_MASK); | |
ea1ab3d3 | 1211 | idetape_queue_pc_tail(drive, &pc); |
1da177e4 LT |
1212 | load_attempted = 1; |
1213 | /* not about to be ready */ | |
1214 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1215 | (tape->ascq == 1 || tape->ascq == 8))) | |
1216 | return -EIO; | |
80ce45fd | 1217 | msleep(100); |
1da177e4 LT |
1218 | } |
1219 | return -EIO; | |
1220 | } | |
1221 | ||
5a04cfa9 | 1222 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 1223 | { |
d236d74c | 1224 | struct ide_atapi_pc pc; |
1da177e4 LT |
1225 | int rc; |
1226 | ||
1227 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
5a04cfa9 BP |
1228 | rc = idetape_queue_pc_tail(drive, &pc); |
1229 | if (rc) | |
1da177e4 LT |
1230 | return rc; |
1231 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1232 | return 0; | |
1233 | } | |
1234 | ||
d236d74c | 1235 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1236 | { |
7bf7420a | 1237 | ide_init_pc(pc); |
90699ce2 | 1238 | pc->c[0] = READ_POSITION; |
d236d74c | 1239 | pc->req_xfer = 20; |
1da177e4 LT |
1240 | } |
1241 | ||
5a04cfa9 | 1242 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
1243 | { |
1244 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1245 | struct ide_atapi_pc pc; |
1da177e4 LT |
1246 | int position; |
1247 | ||
8004a8c9 | 1248 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
1249 | |
1250 | idetape_create_read_position_cmd(&pc); | |
1251 | if (idetape_queue_pc_tail(drive, &pc)) | |
1252 | return -1; | |
54bb2074 | 1253 | position = tape->first_frame; |
1da177e4 LT |
1254 | return position; |
1255 | } | |
1256 | ||
d236d74c BP |
1257 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
1258 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1259 | unsigned int block, u8 partition, int skip) |
1da177e4 | 1260 | { |
7bf7420a | 1261 | ide_init_pc(pc); |
90699ce2 | 1262 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 1263 | pc->c[1] = 2; |
860ff5ec | 1264 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 1265 | pc->c[8] = partition; |
346331f8 | 1266 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1267 | } |
1268 | ||
d236d74c BP |
1269 | static int idetape_create_prevent_cmd(ide_drive_t *drive, |
1270 | struct ide_atapi_pc *pc, int prevent) | |
1da177e4 LT |
1271 | { |
1272 | idetape_tape_t *tape = drive->driver_data; | |
1273 | ||
b6422013 BP |
1274 | /* device supports locking according to capabilities page */ |
1275 | if (!(tape->caps[6] & 0x01)) | |
1da177e4 LT |
1276 | return 0; |
1277 | ||
7bf7420a | 1278 | ide_init_pc(pc); |
90699ce2 | 1279 | pc->c[0] = ALLOW_MEDIUM_REMOVAL; |
1da177e4 | 1280 | pc->c[4] = prevent; |
1da177e4 LT |
1281 | return 1; |
1282 | } | |
1283 | ||
385a4b87 BZ |
1284 | static int ide_tape_set_media_lock(ide_drive_t *drive, int on) |
1285 | { | |
1286 | struct ide_atapi_pc pc; | |
1287 | ||
1288 | if (!idetape_create_prevent_cmd(drive, &pc, on)) | |
1289 | return 0; | |
1290 | ||
1291 | return idetape_queue_pc_tail(drive, &pc); | |
1292 | } | |
1293 | ||
ec0fdb01 | 1294 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1295 | { |
1296 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1297 | |
54abf37e | 1298 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 1299 | return; |
1da177e4 | 1300 | |
f2e3ab52 | 1301 | clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); |
01a63aeb | 1302 | tape->merge_bh_size = 0; |
077e3bdb BP |
1303 | if (tape->merge_bh != NULL) { |
1304 | ide_tape_kfree_buffer(tape); | |
1305 | tape->merge_bh = NULL; | |
1da177e4 LT |
1306 | } |
1307 | ||
54abf37e | 1308 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1309 | } |
1310 | ||
1311 | /* | |
3c98bf34 BP |
1312 | * Position the tape to the requested block using the LOCATE packet command. |
1313 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1314 | * all higher level operations, we queue the commands at the tail of the request | |
1315 | * queue and wait for their completion. | |
1da177e4 | 1316 | */ |
5a04cfa9 BP |
1317 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
1318 | u8 partition, int skip) | |
1da177e4 LT |
1319 | { |
1320 | idetape_tape_t *tape = drive->driver_data; | |
1321 | int retval; | |
d236d74c | 1322 | struct ide_atapi_pc pc; |
1da177e4 | 1323 | |
54abf37e | 1324 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 1325 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1326 | idetape_wait_ready(drive, 60 * 5 * HZ); |
1327 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
1328 | retval = idetape_queue_pc_tail(drive, &pc); | |
1329 | if (retval) | |
1330 | return (retval); | |
1331 | ||
1332 | idetape_create_read_position_cmd(&pc); | |
1333 | return (idetape_queue_pc_tail(drive, &pc)); | |
1334 | } | |
1335 | ||
ec0fdb01 | 1336 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 1337 | int restore_position) |
1da177e4 LT |
1338 | { |
1339 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1340 | int seek, position; |
1341 | ||
ec0fdb01 | 1342 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1343 | if (restore_position) { |
1344 | position = idetape_read_position(drive); | |
9798630a | 1345 | seek = position > 0 ? position : 0; |
1da177e4 | 1346 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 1347 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 1348 | " %s\n", tape->name, __func__); |
1da177e4 LT |
1349 | return; |
1350 | } | |
1351 | } | |
1352 | } | |
1353 | ||
1354 | /* | |
3c98bf34 BP |
1355 | * Generate a read/write request for the block device interface and wait for it |
1356 | * to be serviced. | |
1da177e4 | 1357 | */ |
5a04cfa9 BP |
1358 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
1359 | struct idetape_bh *bh) | |
1da177e4 LT |
1360 | { |
1361 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a FT |
1362 | struct request *rq; |
1363 | int ret, errors; | |
1da177e4 | 1364 | |
8004a8c9 BP |
1365 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
1366 | ||
64ea1b4a FT |
1367 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1368 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1369 | rq->cmd[13] = cmd; |
64ea1b4a FT |
1370 | rq->rq_disk = tape->disk; |
1371 | rq->special = (void *)bh; | |
1372 | rq->sector = tape->first_frame; | |
1373 | rq->nr_sectors = blocks; | |
1374 | rq->current_nr_sectors = blocks; | |
1375 | blk_execute_rq(drive->queue, tape->disk, rq, 0); | |
1376 | ||
1377 | errors = rq->errors; | |
1378 | ret = tape->blk_size * (blocks - rq->current_nr_sectors); | |
1379 | blk_put_request(rq); | |
1da177e4 LT |
1380 | |
1381 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1382 | return 0; | |
1383 | ||
077e3bdb BP |
1384 | if (tape->merge_bh) |
1385 | idetape_init_merge_buffer(tape); | |
64ea1b4a | 1386 | if (errors == IDETAPE_ERROR_GENERAL) |
1da177e4 | 1387 | return -EIO; |
64ea1b4a | 1388 | return ret; |
1da177e4 LT |
1389 | } |
1390 | ||
d236d74c | 1391 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1392 | { |
7bf7420a | 1393 | ide_init_pc(pc); |
90699ce2 | 1394 | pc->c[0] = INQUIRY; |
5a04cfa9 | 1395 | pc->c[4] = 254; |
d236d74c | 1396 | pc->req_xfer = 254; |
1da177e4 LT |
1397 | } |
1398 | ||
d236d74c BP |
1399 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
1400 | struct ide_atapi_pc *pc) | |
1da177e4 | 1401 | { |
7bf7420a | 1402 | ide_init_pc(pc); |
90699ce2 | 1403 | pc->c[0] = REZERO_UNIT; |
346331f8 | 1404 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1405 | } |
1406 | ||
d236d74c | 1407 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 1408 | { |
7bf7420a | 1409 | ide_init_pc(pc); |
90699ce2 | 1410 | pc->c[0] = ERASE; |
1da177e4 | 1411 | pc->c[1] = 1; |
346331f8 | 1412 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1413 | } |
1414 | ||
d236d74c | 1415 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 | 1416 | { |
7bf7420a | 1417 | ide_init_pc(pc); |
90699ce2 | 1418 | pc->c[0] = SPACE; |
860ff5ec | 1419 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 1420 | pc->c[1] = cmd; |
346331f8 | 1421 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1422 | } |
1423 | ||
97c566ce | 1424 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 1425 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1426 | { |
1427 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1428 | |
8004a8c9 | 1429 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 1430 | |
0aa4b01e | 1431 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
077e3bdb | 1432 | blocks, tape->merge_bh); |
1da177e4 LT |
1433 | } |
1434 | ||
d9df937a | 1435 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1436 | { |
1437 | idetape_tape_t *tape = drive->driver_data; | |
1438 | int blocks, min; | |
1439 | struct idetape_bh *bh; | |
55a5d291 | 1440 | |
54abf37e | 1441 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 1442 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 1443 | " but we are not writing.\n"); |
1da177e4 LT |
1444 | return; |
1445 | } | |
01a63aeb | 1446 | if (tape->merge_bh_size > tape->buffer_size) { |
1da177e4 | 1447 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
01a63aeb | 1448 | tape->merge_bh_size = tape->buffer_size; |
1da177e4 | 1449 | } |
01a63aeb BP |
1450 | if (tape->merge_bh_size) { |
1451 | blocks = tape->merge_bh_size / tape->blk_size; | |
1452 | if (tape->merge_bh_size % tape->blk_size) { | |
1da177e4 LT |
1453 | unsigned int i; |
1454 | ||
1455 | blocks++; | |
01a63aeb | 1456 | i = tape->blk_size - tape->merge_bh_size % |
54bb2074 | 1457 | tape->blk_size; |
1da177e4 LT |
1458 | bh = tape->bh->b_reqnext; |
1459 | while (bh) { | |
1460 | atomic_set(&bh->b_count, 0); | |
1461 | bh = bh->b_reqnext; | |
1462 | } | |
1463 | bh = tape->bh; | |
1464 | while (i) { | |
1465 | if (bh == NULL) { | |
5a04cfa9 BP |
1466 | printk(KERN_INFO "ide-tape: bug," |
1467 | " bh NULL\n"); | |
1da177e4 LT |
1468 | break; |
1469 | } | |
5a04cfa9 BP |
1470 | min = min(i, (unsigned int)(bh->b_size - |
1471 | atomic_read(&bh->b_count))); | |
1472 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1473 | 0, min); | |
1da177e4 LT |
1474 | atomic_add(min, &bh->b_count); |
1475 | i -= min; | |
1476 | bh = bh->b_reqnext; | |
1477 | } | |
1478 | } | |
1479 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
01a63aeb | 1480 | tape->merge_bh_size = 0; |
1da177e4 | 1481 | } |
077e3bdb BP |
1482 | if (tape->merge_bh != NULL) { |
1483 | ide_tape_kfree_buffer(tape); | |
1484 | tape->merge_bh = NULL; | |
1da177e4 | 1485 | } |
54abf37e | 1486 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1487 | } |
1488 | ||
83042b24 | 1489 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
1490 | { |
1491 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1492 | int bytes_read; |
1da177e4 LT |
1493 | |
1494 | /* Initialize read operation */ | |
54abf37e BP |
1495 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1496 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
d9df937a | 1497 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1498 | idetape_flush_tape_buffers(drive); |
1499 | } | |
077e3bdb | 1500 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1501 | printk(KERN_ERR "ide-tape: merge_bh_size should be" |
5a04cfa9 | 1502 | " 0 now\n"); |
01a63aeb | 1503 | tape->merge_bh_size = 0; |
1da177e4 | 1504 | } |
077e3bdb BP |
1505 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1506 | if (!tape->merge_bh) | |
1da177e4 | 1507 | return -ENOMEM; |
54abf37e | 1508 | tape->chrdev_dir = IDETAPE_DIR_READ; |
1da177e4 LT |
1509 | |
1510 | /* | |
3c98bf34 BP |
1511 | * Issue a read 0 command to ensure that DSC handshake is |
1512 | * switched from completion mode to buffer available mode. | |
1513 | * No point in issuing this if DSC overlap isn't supported, some | |
1514 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1515 | */ |
1516 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1517 | bytes_read = idetape_queue_rw_tail(drive, |
1518 | REQ_IDETAPE_READ, 0, | |
077e3bdb | 1519 | tape->merge_bh); |
1da177e4 | 1520 | if (bytes_read < 0) { |
077e3bdb BP |
1521 | ide_tape_kfree_buffer(tape); |
1522 | tape->merge_bh = NULL; | |
54abf37e | 1523 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1524 | return bytes_read; |
1525 | } | |
1526 | } | |
1527 | } | |
5e69bd95 | 1528 | |
1da177e4 LT |
1529 | return 0; |
1530 | } | |
1531 | ||
5bd50dc6 | 1532 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1533 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1534 | { |
1535 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1536 | |
8004a8c9 | 1537 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1538 | |
3c98bf34 | 1539 | /* If we are at a filemark, return a read length of 0 */ |
f2e3ab52 | 1540 | if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 LT |
1541 | return 0; |
1542 | ||
83042b24 | 1543 | idetape_init_read(drive); |
5e69bd95 | 1544 | |
5e69bd95 | 1545 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
077e3bdb | 1546 | tape->merge_bh); |
1da177e4 LT |
1547 | } |
1548 | ||
5a04cfa9 | 1549 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1550 | { |
1551 | idetape_tape_t *tape = drive->driver_data; | |
1552 | struct idetape_bh *bh; | |
1553 | int blocks; | |
3c98bf34 | 1554 | |
1da177e4 LT |
1555 | while (bcount) { |
1556 | unsigned int count; | |
1557 | ||
077e3bdb | 1558 | bh = tape->merge_bh; |
f73850a3 | 1559 | count = min(tape->buffer_size, bcount); |
1da177e4 | 1560 | bcount -= count; |
54bb2074 | 1561 | blocks = count / tape->blk_size; |
1da177e4 | 1562 | while (count) { |
5a04cfa9 BP |
1563 | atomic_set(&bh->b_count, |
1564 | min(count, (unsigned int)bh->b_size)); | |
1da177e4 LT |
1565 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
1566 | count -= atomic_read(&bh->b_count); | |
1567 | bh = bh->b_reqnext; | |
1568 | } | |
5a04cfa9 | 1569 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
077e3bdb | 1570 | tape->merge_bh); |
1da177e4 LT |
1571 | } |
1572 | } | |
1573 | ||
1da177e4 | 1574 | /* |
3c98bf34 BP |
1575 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1576 | * currently support only one partition. | |
1577 | */ | |
5a04cfa9 | 1578 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 LT |
1579 | { |
1580 | int retval; | |
d236d74c | 1581 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1582 | idetape_tape_t *tape; |
1583 | tape = drive->driver_data; | |
1584 | ||
1585 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1586 | ||
1da177e4 LT |
1587 | idetape_create_rewind_cmd(drive, &pc); |
1588 | retval = idetape_queue_pc_tail(drive, &pc); | |
1589 | if (retval) | |
1590 | return retval; | |
1591 | ||
1592 | idetape_create_read_position_cmd(&pc); | |
1593 | retval = idetape_queue_pc_tail(drive, &pc); | |
1594 | if (retval) | |
1595 | return retval; | |
1596 | return 0; | |
1597 | } | |
1598 | ||
3c98bf34 | 1599 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1600 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1601 | unsigned long arg) | |
1da177e4 LT |
1602 | { |
1603 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1604 | void __user *argp = (void __user *)arg; |
1605 | ||
d59823fa BP |
1606 | struct idetape_config { |
1607 | int dsc_rw_frequency; | |
1608 | int dsc_media_access_frequency; | |
1609 | int nr_stages; | |
1610 | } config; | |
1611 | ||
8004a8c9 BP |
1612 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1613 | ||
1da177e4 | 1614 | switch (cmd) { |
5a04cfa9 BP |
1615 | case 0x0340: |
1616 | if (copy_from_user(&config, argp, sizeof(config))) | |
1617 | return -EFAULT; | |
1618 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1619 | break; |
1620 | case 0x0350: | |
1621 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1622 | config.nr_stages = 1; |
5a04cfa9 BP |
1623 | if (copy_to_user(argp, &config, sizeof(config))) |
1624 | return -EFAULT; | |
1625 | break; | |
1626 | default: | |
1627 | return -EIO; | |
1da177e4 LT |
1628 | } |
1629 | return 0; | |
1630 | } | |
1631 | ||
5a04cfa9 BP |
1632 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1633 | int mt_count) | |
1da177e4 LT |
1634 | { |
1635 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1636 | struct ide_atapi_pc pc; |
5a04cfa9 | 1637 | int retval, count = 0; |
b6422013 | 1638 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1639 | |
1640 | if (mt_count == 0) | |
1641 | return 0; | |
1642 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1643 | if (!sprev) |
1da177e4 | 1644 | return -EIO; |
5a04cfa9 | 1645 | mt_count = -mt_count; |
1da177e4 LT |
1646 | } |
1647 | ||
54abf37e | 1648 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
01a63aeb | 1649 | tape->merge_bh_size = 0; |
f2e3ab52 | 1650 | if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 | 1651 | ++count; |
ec0fdb01 | 1652 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1653 | } |
1654 | ||
1da177e4 | 1655 | switch (mt_op) { |
5a04cfa9 BP |
1656 | case MTFSF: |
1657 | case MTBSF: | |
1658 | idetape_create_space_cmd(&pc, mt_count - count, | |
1659 | IDETAPE_SPACE_OVER_FILEMARK); | |
1660 | return idetape_queue_pc_tail(drive, &pc); | |
1661 | case MTFSFM: | |
1662 | case MTBSFM: | |
1663 | if (!sprev) | |
1664 | return -EIO; | |
1665 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1666 | mt_count - count); | |
1667 | if (retval) | |
1668 | return retval; | |
1669 | count = (MTBSFM == mt_op ? 1 : -1); | |
1670 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1671 | default: | |
1672 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1673 | mt_op); | |
1674 | return -EIO; | |
1da177e4 LT |
1675 | } |
1676 | } | |
1677 | ||
1da177e4 | 1678 | /* |
3c98bf34 | 1679 | * Our character device read / write functions. |
1da177e4 | 1680 | * |
3c98bf34 BP |
1681 | * The tape is optimized to maximize throughput when it is transferring an |
1682 | * integral number of the "continuous transfer limit", which is a parameter of | |
1683 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1684 | * |
3c98bf34 BP |
1685 | * As of version 1.3 of the driver, the character device provides an abstract |
1686 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1687 | * same backup/restore procedure is supported. The driver will internally | |
1688 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1689 | * between the user's block size to the recommended size will only result in a | |
1690 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1691 | * This is not applicable to Onstream. | |
1da177e4 | 1692 | */ |
5a04cfa9 BP |
1693 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1694 | size_t count, loff_t *ppos) | |
1da177e4 LT |
1695 | { |
1696 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1697 | ide_drive_t *drive = tape->drive; | |
5a04cfa9 | 1698 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 1699 | ssize_t ret = 0; |
b6422013 | 1700 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 1701 | |
8004a8c9 | 1702 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1703 | |
54abf37e | 1704 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
f2e3ab52 | 1705 | if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) |
54bb2074 BP |
1706 | if (count > tape->blk_size && |
1707 | (count % tape->blk_size) == 0) | |
1708 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1709 | } |
83042b24 | 1710 | rc = idetape_init_read(drive); |
8d06bfad | 1711 | if (rc < 0) |
1da177e4 LT |
1712 | return rc; |
1713 | if (count == 0) | |
1714 | return (0); | |
01a63aeb BP |
1715 | if (tape->merge_bh_size) { |
1716 | actually_read = min((unsigned int)(tape->merge_bh_size), | |
5a04cfa9 | 1717 | (unsigned int)count); |
99d74e61 | 1718 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
dcd96379 | 1719 | ret = -EFAULT; |
1da177e4 | 1720 | buf += actually_read; |
01a63aeb | 1721 | tape->merge_bh_size -= actually_read; |
1da177e4 LT |
1722 | count -= actually_read; |
1723 | } | |
f73850a3 | 1724 | while (count >= tape->buffer_size) { |
b6422013 | 1725 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1726 | if (bytes_read <= 0) |
1727 | goto finish; | |
99d74e61 | 1728 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
dcd96379 | 1729 | ret = -EFAULT; |
1da177e4 LT |
1730 | buf += bytes_read; |
1731 | count -= bytes_read; | |
1732 | actually_read += bytes_read; | |
1733 | } | |
1734 | if (count) { | |
b6422013 | 1735 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1736 | if (bytes_read <= 0) |
1737 | goto finish; | |
1738 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
99d74e61 | 1739 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
dcd96379 | 1740 | ret = -EFAULT; |
1da177e4 | 1741 | actually_read += temp; |
01a63aeb | 1742 | tape->merge_bh_size = bytes_read-temp; |
1da177e4 LT |
1743 | } |
1744 | finish: | |
f2e3ab52 | 1745 | if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { |
8004a8c9 BP |
1746 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1747 | ||
1da177e4 LT |
1748 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1749 | return 0; | |
1750 | } | |
dcd96379 | 1751 | |
5a04cfa9 | 1752 | return ret ? ret : actually_read; |
1da177e4 LT |
1753 | } |
1754 | ||
5a04cfa9 | 1755 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1756 | size_t count, loff_t *ppos) |
1757 | { | |
1758 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1759 | ide_drive_t *drive = tape->drive; | |
dcd96379 DW |
1760 | ssize_t actually_written = 0; |
1761 | ssize_t ret = 0; | |
b6422013 | 1762 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
1763 | |
1764 | /* The drive is write protected. */ | |
1765 | if (tape->write_prot) | |
1766 | return -EACCES; | |
1767 | ||
8004a8c9 | 1768 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1769 | |
1770 | /* Initialize write operation */ | |
54abf37e BP |
1771 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
1772 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1773 | ide_tape_discard_merge_buffer(drive, 1); |
077e3bdb | 1774 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1775 | printk(KERN_ERR "ide-tape: merge_bh_size " |
1da177e4 | 1776 | "should be 0 now\n"); |
01a63aeb | 1777 | tape->merge_bh_size = 0; |
1da177e4 | 1778 | } |
077e3bdb BP |
1779 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1780 | if (!tape->merge_bh) | |
1da177e4 | 1781 | return -ENOMEM; |
54abf37e | 1782 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
077e3bdb | 1783 | idetape_init_merge_buffer(tape); |
1da177e4 LT |
1784 | |
1785 | /* | |
3c98bf34 BP |
1786 | * Issue a write 0 command to ensure that DSC handshake is |
1787 | * switched from completion mode to buffer available mode. No | |
1788 | * point in issuing this if DSC overlap isn't supported, some | |
1789 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1790 | */ |
1791 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1792 | ssize_t retval = idetape_queue_rw_tail(drive, |
1793 | REQ_IDETAPE_WRITE, 0, | |
077e3bdb | 1794 | tape->merge_bh); |
1da177e4 | 1795 | if (retval < 0) { |
077e3bdb BP |
1796 | ide_tape_kfree_buffer(tape); |
1797 | tape->merge_bh = NULL; | |
54abf37e | 1798 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1799 | return retval; |
1800 | } | |
1801 | } | |
1802 | } | |
1803 | if (count == 0) | |
1804 | return (0); | |
01a63aeb BP |
1805 | if (tape->merge_bh_size) { |
1806 | if (tape->merge_bh_size >= tape->buffer_size) { | |
5a04cfa9 | 1807 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
01a63aeb | 1808 | tape->merge_bh_size = 0; |
1da177e4 | 1809 | } |
5a04cfa9 | 1810 | actually_written = min((unsigned int) |
01a63aeb | 1811 | (tape->buffer_size - tape->merge_bh_size), |
5a04cfa9 | 1812 | (unsigned int)count); |
8646c88f | 1813 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
dcd96379 | 1814 | ret = -EFAULT; |
1da177e4 | 1815 | buf += actually_written; |
01a63aeb | 1816 | tape->merge_bh_size += actually_written; |
1da177e4 LT |
1817 | count -= actually_written; |
1818 | ||
01a63aeb | 1819 | if (tape->merge_bh_size == tape->buffer_size) { |
dcd96379 | 1820 | ssize_t retval; |
01a63aeb | 1821 | tape->merge_bh_size = 0; |
b6422013 | 1822 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
1823 | if (retval <= 0) |
1824 | return (retval); | |
1825 | } | |
1826 | } | |
f73850a3 | 1827 | while (count >= tape->buffer_size) { |
dcd96379 | 1828 | ssize_t retval; |
f73850a3 | 1829 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
dcd96379 | 1830 | ret = -EFAULT; |
f73850a3 BP |
1831 | buf += tape->buffer_size; |
1832 | count -= tape->buffer_size; | |
b6422013 | 1833 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 1834 | actually_written += tape->buffer_size; |
1da177e4 LT |
1835 | if (retval <= 0) |
1836 | return (retval); | |
1837 | } | |
1838 | if (count) { | |
1839 | actually_written += count; | |
8646c88f | 1840 | if (idetape_copy_stage_from_user(tape, buf, count)) |
dcd96379 | 1841 | ret = -EFAULT; |
01a63aeb | 1842 | tape->merge_bh_size += count; |
1da177e4 | 1843 | } |
5a04cfa9 | 1844 | return ret ? ret : actually_written; |
1da177e4 LT |
1845 | } |
1846 | ||
5a04cfa9 | 1847 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1848 | { |
d236d74c | 1849 | struct ide_atapi_pc pc; |
1da177e4 LT |
1850 | |
1851 | /* Write a filemark */ | |
1852 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
1853 | if (idetape_queue_pc_tail(drive, &pc)) { | |
1854 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); | |
1855 | return -EIO; | |
1856 | } | |
1857 | return 0; | |
1858 | } | |
1859 | ||
1860 | /* | |
d99c9da2 BP |
1861 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1862 | * requested. | |
1da177e4 | 1863 | * |
d99c9da2 BP |
1864 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1865 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1866 | * usually not supported. |
1da177e4 | 1867 | * |
d99c9da2 | 1868 | * The following commands are currently not supported: |
1da177e4 | 1869 | * |
d99c9da2 BP |
1870 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1871 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1872 | */ |
d99c9da2 | 1873 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1874 | { |
1875 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1876 | struct ide_atapi_pc pc; |
5a04cfa9 | 1877 | int i, retval; |
1da177e4 | 1878 | |
8004a8c9 BP |
1879 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
1880 | mt_op, mt_count); | |
5a04cfa9 | 1881 | |
1da177e4 | 1882 | switch (mt_op) { |
5a04cfa9 BP |
1883 | case MTFSF: |
1884 | case MTFSFM: | |
1885 | case MTBSF: | |
1886 | case MTBSFM: | |
1887 | if (!mt_count) | |
1888 | return 0; | |
1889 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1890 | default: | |
1891 | break; | |
1da177e4 | 1892 | } |
5a04cfa9 | 1893 | |
1da177e4 | 1894 | switch (mt_op) { |
5a04cfa9 BP |
1895 | case MTWEOF: |
1896 | if (tape->write_prot) | |
1897 | return -EACCES; | |
ec0fdb01 | 1898 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1899 | for (i = 0; i < mt_count; i++) { |
1900 | retval = idetape_write_filemark(drive); | |
1901 | if (retval) | |
1902 | return retval; | |
1903 | } | |
1904 | return 0; | |
1905 | case MTREW: | |
ec0fdb01 | 1906 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1907 | if (idetape_rewind_tape(drive)) |
1908 | return -EIO; | |
1909 | return 0; | |
1910 | case MTLOAD: | |
ec0fdb01 | 1911 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1912 | idetape_create_load_unload_cmd(drive, &pc, |
1913 | IDETAPE_LU_LOAD_MASK); | |
1914 | return idetape_queue_pc_tail(drive, &pc); | |
1915 | case MTUNLOAD: | |
1916 | case MTOFFL: | |
1917 | /* | |
1918 | * If door is locked, attempt to unlock before | |
1919 | * attempting to eject. | |
1920 | */ | |
1921 | if (tape->door_locked) { | |
385a4b87 BZ |
1922 | if (!ide_tape_set_media_lock(drive, 0)) |
1923 | tape->door_locked = DOOR_UNLOCKED; | |
5a04cfa9 | 1924 | } |
ec0fdb01 | 1925 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1926 | idetape_create_load_unload_cmd(drive, &pc, |
1927 | !IDETAPE_LU_LOAD_MASK); | |
1928 | retval = idetape_queue_pc_tail(drive, &pc); | |
1929 | if (!retval) | |
f2e3ab52 | 1930 | clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
5a04cfa9 BP |
1931 | return retval; |
1932 | case MTNOP: | |
ec0fdb01 | 1933 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1934 | return idetape_flush_tape_buffers(drive); |
1935 | case MTRETEN: | |
ec0fdb01 | 1936 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1937 | idetape_create_load_unload_cmd(drive, &pc, |
1938 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); | |
1939 | return idetape_queue_pc_tail(drive, &pc); | |
1940 | case MTEOM: | |
1941 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
1942 | return idetape_queue_pc_tail(drive, &pc); | |
1943 | case MTERASE: | |
1944 | (void)idetape_rewind_tape(drive); | |
1945 | idetape_create_erase_cmd(&pc); | |
1946 | return idetape_queue_pc_tail(drive, &pc); | |
1947 | case MTSETBLK: | |
1948 | if (mt_count) { | |
1949 | if (mt_count < tape->blk_size || | |
1950 | mt_count % tape->blk_size) | |
1da177e4 | 1951 | return -EIO; |
5a04cfa9 | 1952 | tape->user_bs_factor = mt_count / tape->blk_size; |
f2e3ab52 | 1953 | clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 | 1954 | } else |
f2e3ab52 | 1955 | set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 BP |
1956 | return 0; |
1957 | case MTSEEK: | |
ec0fdb01 | 1958 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1959 | return idetape_position_tape(drive, |
1960 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1961 | case MTSETPART: | |
ec0fdb01 | 1962 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1963 | return idetape_position_tape(drive, 0, mt_count, 0); |
1964 | case MTFSR: | |
1965 | case MTBSR: | |
1966 | case MTLOCK: | |
385a4b87 | 1967 | retval = ide_tape_set_media_lock(drive, 1); |
5a04cfa9 | 1968 | if (retval) |
1da177e4 | 1969 | return retval; |
5a04cfa9 BP |
1970 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1971 | return 0; | |
1972 | case MTUNLOCK: | |
385a4b87 | 1973 | retval = ide_tape_set_media_lock(drive, 0); |
5a04cfa9 BP |
1974 | if (retval) |
1975 | return retval; | |
1976 | tape->door_locked = DOOR_UNLOCKED; | |
1977 | return 0; | |
1978 | default: | |
1979 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1980 | mt_op); | |
1981 | return -EIO; | |
1da177e4 LT |
1982 | } |
1983 | } | |
1984 | ||
1985 | /* | |
d99c9da2 BP |
1986 | * Our character device ioctls. General mtio.h magnetic io commands are |
1987 | * supported here, and not in the corresponding block interface. Our own | |
1988 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 1989 | */ |
d99c9da2 BP |
1990 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
1991 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
1992 | { |
1993 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1994 | ide_drive_t *drive = tape->drive; | |
1995 | struct mtop mtop; | |
1996 | struct mtget mtget; | |
1997 | struct mtpos mtpos; | |
54bb2074 | 1998 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
1999 | void __user *argp = (void __user *)arg; |
2000 | ||
8004a8c9 | 2001 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 2002 | |
54abf37e | 2003 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 2004 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
2005 | idetape_flush_tape_buffers(drive); |
2006 | } | |
2007 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
01a63aeb | 2008 | block_offset = tape->merge_bh_size / |
54bb2074 | 2009 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
2010 | position = idetape_read_position(drive); |
2011 | if (position < 0) | |
1da177e4 LT |
2012 | return -EIO; |
2013 | } | |
2014 | switch (cmd) { | |
5a04cfa9 BP |
2015 | case MTIOCTOP: |
2016 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
2017 | return -EFAULT; | |
2018 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
2019 | case MTIOCGET: | |
2020 | memset(&mtget, 0, sizeof(struct mtget)); | |
2021 | mtget.mt_type = MT_ISSCSI2; | |
2022 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2023 | mtget.mt_dsreg = | |
2024 | ((tape->blk_size * tape->user_bs_factor) | |
2025 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
2026 | ||
2027 | if (tape->drv_write_prot) | |
2028 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
2029 | ||
2030 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
2031 | return -EFAULT; | |
2032 | return 0; | |
2033 | case MTIOCPOS: | |
2034 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2035 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
2036 | return -EFAULT; | |
2037 | return 0; | |
2038 | default: | |
2039 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 2040 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 2041 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
2042 | } |
2043 | } | |
2044 | ||
3cffb9ce BP |
2045 | /* |
2046 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
2047 | * block size with the reported value. | |
2048 | */ | |
2049 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
2050 | { | |
2051 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2052 | struct ide_atapi_pc pc; |
3cffb9ce BP |
2053 | |
2054 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2055 | if (idetape_queue_pc_tail(drive, &pc)) { | |
2056 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); | |
54bb2074 | 2057 | if (tape->blk_size == 0) { |
3cffb9ce BP |
2058 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
2059 | "block size, assuming 32k\n"); | |
54bb2074 | 2060 | tape->blk_size = 32768; |
3cffb9ce BP |
2061 | } |
2062 | return; | |
2063 | } | |
d236d74c BP |
2064 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
2065 | (pc.buf[4 + 6] << 8) + | |
2066 | pc.buf[4 + 7]; | |
2067 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 2068 | } |
1da177e4 | 2069 | |
5a04cfa9 | 2070 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
2071 | { |
2072 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
2073 | ide_drive_t *drive; | |
2074 | idetape_tape_t *tape; | |
1da177e4 LT |
2075 | int retval; |
2076 | ||
8004a8c9 BP |
2077 | if (i >= MAX_HWIFS * MAX_DRIVES) |
2078 | return -ENXIO; | |
2079 | ||
04f4ac9d | 2080 | lock_kernel(); |
8004a8c9 | 2081 | tape = ide_tape_chrdev_get(i); |
04f4ac9d JC |
2082 | if (!tape) { |
2083 | unlock_kernel(); | |
8004a8c9 | 2084 | return -ENXIO; |
04f4ac9d | 2085 | } |
8004a8c9 BP |
2086 | |
2087 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
2088 | ||
1da177e4 LT |
2089 | /* |
2090 | * We really want to do nonseekable_open(inode, filp); here, but some | |
2091 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
2092 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
2093 | */ | |
2094 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
2095 | ||
1da177e4 LT |
2096 | drive = tape->drive; |
2097 | ||
2098 | filp->private_data = tape; | |
2099 | ||
f2e3ab52 | 2100 | if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { |
1da177e4 LT |
2101 | retval = -EBUSY; |
2102 | goto out_put_tape; | |
2103 | } | |
2104 | ||
2105 | retval = idetape_wait_ready(drive, 60 * HZ); | |
2106 | if (retval) { | |
f2e3ab52 | 2107 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2108 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
2109 | goto out_put_tape; | |
2110 | } | |
2111 | ||
2112 | idetape_read_position(drive); | |
f2e3ab52 | 2113 | if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) |
1da177e4 LT |
2114 | (void)idetape_rewind_tape(drive); |
2115 | ||
1da177e4 | 2116 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 2117 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
2118 | |
2119 | /* Set write protect flag if device is opened as read-only. */ | |
2120 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
2121 | tape->write_prot = 1; | |
2122 | else | |
2123 | tape->write_prot = tape->drv_write_prot; | |
2124 | ||
2125 | /* Make sure drive isn't write protected if user wants to write. */ | |
2126 | if (tape->write_prot) { | |
2127 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
2128 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
f2e3ab52 | 2129 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2130 | retval = -EROFS; |
2131 | goto out_put_tape; | |
2132 | } | |
2133 | } | |
2134 | ||
3c98bf34 | 2135 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 2136 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
385a4b87 BZ |
2137 | if (!ide_tape_set_media_lock(drive, 1)) { |
2138 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) | |
2139 | tape->door_locked = DOOR_LOCKED; | |
1da177e4 LT |
2140 | } |
2141 | } | |
04f4ac9d | 2142 | unlock_kernel(); |
1da177e4 LT |
2143 | return 0; |
2144 | ||
2145 | out_put_tape: | |
2146 | ide_tape_put(tape); | |
04f4ac9d | 2147 | unlock_kernel(); |
1da177e4 LT |
2148 | return retval; |
2149 | } | |
2150 | ||
5a04cfa9 | 2151 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
2152 | { |
2153 | idetape_tape_t *tape = drive->driver_data; | |
2154 | ||
d9df937a | 2155 | ide_tape_flush_merge_buffer(drive); |
077e3bdb BP |
2156 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); |
2157 | if (tape->merge_bh != NULL) { | |
54bb2074 BP |
2158 | idetape_pad_zeros(drive, tape->blk_size * |
2159 | (tape->user_bs_factor - 1)); | |
077e3bdb BP |
2160 | ide_tape_kfree_buffer(tape); |
2161 | tape->merge_bh = NULL; | |
1da177e4 LT |
2162 | } |
2163 | idetape_write_filemark(drive); | |
2164 | idetape_flush_tape_buffers(drive); | |
2165 | idetape_flush_tape_buffers(drive); | |
2166 | } | |
2167 | ||
5a04cfa9 | 2168 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 LT |
2169 | { |
2170 | struct ide_tape_obj *tape = ide_tape_f(filp); | |
2171 | ide_drive_t *drive = tape->drive; | |
1da177e4 LT |
2172 | unsigned int minor = iminor(inode); |
2173 | ||
2174 | lock_kernel(); | |
2175 | tape = drive->driver_data; | |
8004a8c9 BP |
2176 | |
2177 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 2178 | |
54abf37e | 2179 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 2180 | idetape_write_release(drive, minor); |
54abf37e | 2181 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 2182 | if (minor < 128) |
ec0fdb01 | 2183 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 2184 | } |
f64eee7b | 2185 | |
f2e3ab52 | 2186 | if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) |
1da177e4 | 2187 | (void) idetape_rewind_tape(drive); |
54abf37e | 2188 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 | 2189 | if (tape->door_locked == DOOR_LOCKED) { |
385a4b87 BZ |
2190 | if (!ide_tape_set_media_lock(drive, 0)) |
2191 | tape->door_locked = DOOR_UNLOCKED; | |
1da177e4 LT |
2192 | } |
2193 | } | |
f2e3ab52 | 2194 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2195 | ide_tape_put(tape); |
2196 | unlock_kernel(); | |
2197 | return 0; | |
2198 | } | |
2199 | ||
6d29c8f0 | 2200 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 2201 | { |
1da177e4 | 2202 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 2203 | struct ide_atapi_pc pc; |
801bd32e | 2204 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 2205 | |
1da177e4 LT |
2206 | idetape_create_inquiry_cmd(&pc); |
2207 | if (idetape_queue_pc_tail(drive, &pc)) { | |
6d29c8f0 BP |
2208 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
2209 | tape->name); | |
1da177e4 LT |
2210 | return; |
2211 | } | |
d236d74c BP |
2212 | memcpy(vendor_id, &pc.buf[8], 8); |
2213 | memcpy(product_id, &pc.buf[16], 16); | |
2214 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 | 2215 | |
801bd32e BP |
2216 | ide_fixstring(vendor_id, 8, 0); |
2217 | ide_fixstring(product_id, 16, 0); | |
2218 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 2219 | |
801bd32e | 2220 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 2221 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
2222 | } |
2223 | ||
2224 | /* | |
b6422013 BP |
2225 | * Ask the tape about its various parameters. In particular, we will adjust our |
2226 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 2227 | */ |
5a04cfa9 | 2228 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
2229 | { |
2230 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2231 | struct ide_atapi_pc pc; |
b6422013 BP |
2232 | u8 *caps; |
2233 | u8 speed, max_speed; | |
47314fa4 | 2234 | |
1da177e4 LT |
2235 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2236 | if (idetape_queue_pc_tail(drive, &pc)) { | |
b6422013 BP |
2237 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
2238 | " some default values\n"); | |
54bb2074 | 2239 | tape->blk_size = 512; |
b6422013 BP |
2240 | put_unaligned(52, (u16 *)&tape->caps[12]); |
2241 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2242 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
2243 | return; |
2244 | } | |
d236d74c | 2245 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
2246 | |
2247 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
2248 | speed = be16_to_cpup((__be16 *)&caps[14]); |
2249 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 2250 | |
cd740ab0 HH |
2251 | *(u16 *)&caps[8] = max_speed; |
2252 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
2253 | *(u16 *)&caps[14] = speed; | |
2254 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 2255 | |
b6422013 BP |
2256 | if (!speed) { |
2257 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2258 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2259 | *(u16 *)&caps[14] = 650; |
1da177e4 | 2260 | } |
b6422013 BP |
2261 | if (!max_speed) { |
2262 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2263 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2264 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
2265 | } |
2266 | ||
b6422013 BP |
2267 | memcpy(&tape->caps, caps, 20); |
2268 | if (caps[7] & 0x02) | |
54bb2074 | 2269 | tape->blk_size = 512; |
b6422013 | 2270 | else if (caps[7] & 0x04) |
54bb2074 | 2271 | tape->blk_size = 1024; |
1da177e4 LT |
2272 | } |
2273 | ||
7662d046 | 2274 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
2275 | #define ide_tape_devset_get(name, field) \ |
2276 | static int get_##name(ide_drive_t *drive) \ | |
2277 | { \ | |
2278 | idetape_tape_t *tape = drive->driver_data; \ | |
2279 | return tape->field; \ | |
2280 | } | |
2281 | ||
2282 | #define ide_tape_devset_set(name, field) \ | |
2283 | static int set_##name(ide_drive_t *drive, int arg) \ | |
2284 | { \ | |
2285 | idetape_tape_t *tape = drive->driver_data; \ | |
2286 | tape->field = arg; \ | |
2287 | return 0; \ | |
2288 | } | |
2289 | ||
2290 | #define ide_tape_devset_rw(_name, _min, _max, _field, _mulf, _divf) \ | |
2291 | ide_tape_devset_get(_name, _field) \ | |
2292 | ide_tape_devset_set(_name, _field) \ | |
2293 | __IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name, _mulf, _divf) | |
2294 | ||
2295 | #define ide_tape_devset_r(_name, _min, _max, _field, _mulf, _divf) \ | |
2296 | ide_tape_devset_get(_name, _field) \ | |
2297 | __IDE_DEVSET(_name, S_READ, _min, _max, get_##_name, NULL, _mulf, _divf) | |
2298 | ||
2299 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
2300 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
2301 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
2302 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
2303 | ||
2304 | ide_devset_rw(dsc_overlap, 0, 1, dsc_overlap); | |
2305 | ||
2306 | ide_tape_devset_rw(debug_mask, 0, 0xffff, debug_mask, NULL, NULL); | |
2307 | ide_tape_devset_rw(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
2308 | best_dsc_rw_freq, mulf_tdsc, divf_tdsc); | |
2309 | ||
2310 | ide_tape_devset_r(avg_speed, 0, 0xffff, avg_speed, NULL, NULL); | |
2311 | ide_tape_devset_r(speed, 0, 0xffff, caps[14], NULL, NULL); | |
2312 | ide_tape_devset_r(buffer, 0, 0xffff, caps[16], NULL, divf_buffer); | |
2313 | ide_tape_devset_r(buffer_size, 0, 0xffff, buffer_size, NULL, divf_buffer_size); | |
2314 | ||
2315 | static const struct ide_devset *idetape_settings[] = { | |
2316 | &ide_devset_avg_speed, | |
2317 | &ide_devset_buffer, | |
2318 | &ide_devset_buffer_size, | |
2319 | &ide_devset_debug_mask, | |
2320 | &ide_devset_dsc_overlap, | |
2321 | &ide_devset_speed, | |
2322 | &ide_devset_tdsc, | |
2323 | NULL | |
2324 | }; | |
7662d046 | 2325 | #endif |
1da177e4 LT |
2326 | |
2327 | /* | |
3c98bf34 | 2328 | * The function below is called to: |
1da177e4 | 2329 | * |
3c98bf34 BP |
2330 | * 1. Initialize our various state variables. |
2331 | * 2. Ask the tape for its capabilities. | |
2332 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2333 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 2334 | * |
3c98bf34 BP |
2335 | * Note that at this point ide.c already assigned us an irq, so that we can |
2336 | * queue requests here and wait for their completion. | |
1da177e4 | 2337 | */ |
5a04cfa9 | 2338 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 2339 | { |
83042b24 | 2340 | unsigned long t; |
1da177e4 | 2341 | int speed; |
f73850a3 | 2342 | int buffer_size; |
71071b8e | 2343 | u8 gcw[2]; |
b6422013 | 2344 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 2345 | |
776bb027 BP |
2346 | drive->pc_callback = ide_tape_callback; |
2347 | ||
54bb2074 | 2348 | spin_lock_init(&tape->lock); |
1da177e4 | 2349 | drive->dsc_overlap = 1; |
4166c199 BZ |
2350 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
2351 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2352 | tape->name); | |
2353 | drive->dsc_overlap = 0; | |
1da177e4 | 2354 | } |
1da177e4 | 2355 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 2356 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
1da177e4 LT |
2357 | drive->dsc_overlap = 0; |
2358 | tape->minor = minor; | |
2359 | tape->name[0] = 'h'; | |
2360 | tape->name[1] = 't'; | |
2361 | tape->name[2] = '0' + minor; | |
54abf37e | 2362 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
4dde4492 BZ |
2363 | |
2364 | *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG]; | |
71071b8e BP |
2365 | |
2366 | /* Command packet DRQ type */ | |
2367 | if (((gcw[0] & 0x60) >> 5) == 1) | |
f2e3ab52 | 2368 | set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags); |
1da177e4 | 2369 | |
1da177e4 LT |
2370 | idetape_get_inquiry_results(drive); |
2371 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 2372 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 2373 | tape->user_bs_factor = 1; |
f73850a3 BP |
2374 | tape->buffer_size = *ctl * tape->blk_size; |
2375 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 2376 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 2377 | *ctl /= 2; |
f73850a3 | 2378 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 2379 | } |
f73850a3 | 2380 | buffer_size = tape->buffer_size; |
a997a435 | 2381 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
f73850a3 | 2382 | if (buffer_size % PAGE_SIZE) { |
a997a435 | 2383 | tape->pages_per_buffer++; |
f73850a3 | 2384 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
1da177e4 LT |
2385 | } |
2386 | ||
83042b24 | 2387 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 2388 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 2389 | |
f73850a3 | 2390 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
2391 | |
2392 | /* | |
3c98bf34 BP |
2393 | * Ensure that the number we got makes sense; limit it within |
2394 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 2395 | */ |
a792bd5a HH |
2396 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
2397 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 2398 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 2399 | "%lums tDSC%s\n", |
b6422013 | 2400 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
2401 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
2402 | tape->buffer_size / 1024, | |
54bb2074 | 2403 | tape->best_dsc_rw_freq * 1000 / HZ, |
1da177e4 LT |
2404 | drive->using_dma ? ", DMA":""); |
2405 | ||
1e874f44 | 2406 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
2407 | } |
2408 | ||
4031bbe4 | 2409 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
2410 | { |
2411 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 2412 | |
7662d046 | 2413 | ide_proc_unregister_driver(drive, tape->driver); |
1da177e4 LT |
2414 | |
2415 | ide_unregister_region(tape->disk); | |
2416 | ||
2417 | ide_tape_put(tape); | |
1da177e4 LT |
2418 | } |
2419 | ||
2420 | static void ide_tape_release(struct kref *kref) | |
2421 | { | |
2422 | struct ide_tape_obj *tape = to_ide_tape(kref); | |
2423 | ide_drive_t *drive = tape->drive; | |
2424 | struct gendisk *g = tape->disk; | |
2425 | ||
01a63aeb | 2426 | BUG_ON(tape->merge_bh_size); |
8604affd | 2427 | |
1da177e4 LT |
2428 | drive->dsc_overlap = 0; |
2429 | drive->driver_data = NULL; | |
dbc1272e | 2430 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
2431 | device_destroy(idetape_sysfs_class, |
2432 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
2433 | idetape_devs[tape->minor] = NULL; |
2434 | g->private_data = NULL; | |
2435 | put_disk(g); | |
2436 | kfree(tape); | |
2437 | } | |
2438 | ||
ecfd80e4 | 2439 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
2440 | static int proc_idetape_read_name |
2441 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2442 | { | |
2443 | ide_drive_t *drive = (ide_drive_t *) data; | |
2444 | idetape_tape_t *tape = drive->driver_data; | |
2445 | char *out = page; | |
2446 | int len; | |
2447 | ||
2448 | len = sprintf(out, "%s\n", tape->name); | |
2449 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2450 | } | |
2451 | ||
2452 | static ide_proc_entry_t idetape_proc[] = { | |
2453 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2454 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2455 | { NULL, 0, NULL, NULL } | |
2456 | }; | |
1da177e4 LT |
2457 | #endif |
2458 | ||
4031bbe4 | 2459 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 2460 | |
1da177e4 | 2461 | static ide_driver_t idetape_driver = { |
8604affd | 2462 | .gen_driver = { |
4ef3b8f4 | 2463 | .owner = THIS_MODULE, |
8604affd BZ |
2464 | .name = "ide-tape", |
2465 | .bus = &ide_bus_type, | |
8604affd | 2466 | }, |
4031bbe4 RK |
2467 | .probe = ide_tape_probe, |
2468 | .remove = ide_tape_remove, | |
1da177e4 LT |
2469 | .version = IDETAPE_VERSION, |
2470 | .media = ide_tape, | |
1da177e4 LT |
2471 | .do_request = idetape_do_request, |
2472 | .end_request = idetape_end_request, | |
2473 | .error = __ide_error, | |
7662d046 | 2474 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 | 2475 | .proc = idetape_proc, |
8185d5aa | 2476 | .settings = idetape_settings, |
7662d046 | 2477 | #endif |
1da177e4 LT |
2478 | }; |
2479 | ||
3c98bf34 | 2480 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 2481 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
2482 | .owner = THIS_MODULE, |
2483 | .read = idetape_chrdev_read, | |
2484 | .write = idetape_chrdev_write, | |
2485 | .ioctl = idetape_chrdev_ioctl, | |
2486 | .open = idetape_chrdev_open, | |
2487 | .release = idetape_chrdev_release, | |
2488 | }; | |
2489 | ||
2490 | static int idetape_open(struct inode *inode, struct file *filp) | |
2491 | { | |
2492 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2493 | struct ide_tape_obj *tape; | |
1da177e4 | 2494 | |
5a04cfa9 BP |
2495 | tape = ide_tape_get(disk); |
2496 | if (!tape) | |
1da177e4 LT |
2497 | return -ENXIO; |
2498 | ||
1da177e4 LT |
2499 | return 0; |
2500 | } | |
2501 | ||
2502 | static int idetape_release(struct inode *inode, struct file *filp) | |
2503 | { | |
2504 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2505 | struct ide_tape_obj *tape = ide_tape_g(disk); | |
1da177e4 LT |
2506 | |
2507 | ide_tape_put(tape); | |
2508 | ||
2509 | return 0; | |
2510 | } | |
2511 | ||
2512 | static int idetape_ioctl(struct inode *inode, struct file *file, | |
2513 | unsigned int cmd, unsigned long arg) | |
2514 | { | |
2515 | struct block_device *bdev = inode->i_bdev; | |
2516 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); | |
2517 | ide_drive_t *drive = tape->drive; | |
2518 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); | |
2519 | if (err == -EINVAL) | |
2520 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2521 | return err; | |
2522 | } | |
2523 | ||
2524 | static struct block_device_operations idetape_block_ops = { | |
2525 | .owner = THIS_MODULE, | |
2526 | .open = idetape_open, | |
2527 | .release = idetape_release, | |
2528 | .ioctl = idetape_ioctl, | |
2529 | }; | |
2530 | ||
4031bbe4 | 2531 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2532 | { |
2533 | idetape_tape_t *tape; | |
2534 | struct gendisk *g; | |
2535 | int minor; | |
2536 | ||
2537 | if (!strstr("ide-tape", drive->driver_req)) | |
2538 | goto failed; | |
2a924662 | 2539 | |
1da177e4 LT |
2540 | if (drive->media != ide_tape) |
2541 | goto failed; | |
2a924662 | 2542 | |
51509eec | 2543 | if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) { |
5a04cfa9 BP |
2544 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
2545 | " the driver\n", drive->name); | |
1da177e4 LT |
2546 | goto failed; |
2547 | } | |
5a04cfa9 | 2548 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2549 | if (tape == NULL) { |
5a04cfa9 BP |
2550 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2551 | drive->name); | |
1da177e4 LT |
2552 | goto failed; |
2553 | } | |
2554 | ||
2555 | g = alloc_disk(1 << PARTN_BITS); | |
2556 | if (!g) | |
2557 | goto out_free_tape; | |
2558 | ||
2559 | ide_init_disk(g, drive); | |
2560 | ||
1da177e4 LT |
2561 | kref_init(&tape->kref); |
2562 | ||
2563 | tape->drive = drive; | |
2564 | tape->driver = &idetape_driver; | |
2565 | tape->disk = g; | |
2566 | ||
2567 | g->private_data = &tape->driver; | |
2568 | ||
2569 | drive->driver_data = tape; | |
2570 | ||
cf8b8975 | 2571 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2572 | for (minor = 0; idetape_devs[minor]; minor++) |
2573 | ; | |
2574 | idetape_devs[minor] = tape; | |
cf8b8975 | 2575 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2576 | |
2577 | idetape_setup(drive, tape, minor); | |
2578 | ||
6ecaaf94 GKH |
2579 | device_create_drvdata(idetape_sysfs_class, &drive->gendev, |
2580 | MKDEV(IDETAPE_MAJOR, minor), NULL, | |
2581 | "%s", tape->name); | |
2582 | device_create_drvdata(idetape_sysfs_class, &drive->gendev, | |
2583 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
2584 | "n%s", tape->name); | |
d5dee80a | 2585 | |
1da177e4 LT |
2586 | g->fops = &idetape_block_ops; |
2587 | ide_register_region(g); | |
2588 | ||
2589 | return 0; | |
8604affd | 2590 | |
1da177e4 LT |
2591 | out_free_tape: |
2592 | kfree(tape); | |
2593 | failed: | |
8604affd | 2594 | return -ENODEV; |
1da177e4 LT |
2595 | } |
2596 | ||
5a04cfa9 | 2597 | static void __exit idetape_exit(void) |
1da177e4 | 2598 | { |
8604affd | 2599 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2600 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2601 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2602 | } | |
2603 | ||
17514e8a | 2604 | static int __init idetape_init(void) |
1da177e4 | 2605 | { |
d5dee80a WD |
2606 | int error = 1; |
2607 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2608 | if (IS_ERR(idetape_sysfs_class)) { | |
2609 | idetape_sysfs_class = NULL; | |
2610 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2611 | error = -EBUSY; | |
2612 | goto out; | |
2613 | } | |
2614 | ||
1da177e4 | 2615 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2616 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2617 | " interface\n"); | |
d5dee80a WD |
2618 | error = -EBUSY; |
2619 | goto out_free_class; | |
1da177e4 | 2620 | } |
d5dee80a WD |
2621 | |
2622 | error = driver_register(&idetape_driver.gen_driver); | |
2623 | if (error) | |
2624 | goto out_free_driver; | |
2625 | ||
2626 | return 0; | |
2627 | ||
2628 | out_free_driver: | |
2629 | driver_unregister(&idetape_driver.gen_driver); | |
2630 | out_free_class: | |
2631 | class_destroy(idetape_sysfs_class); | |
2632 | out: | |
2633 | return error; | |
1da177e4 LT |
2634 | } |
2635 | ||
263756ec | 2636 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2637 | module_init(idetape_init); |
2638 | module_exit(idetape_exit); | |
2639 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2640 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2641 | MODULE_LICENSE("GPL"); |