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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), | |
59 | /* buffer alloc info (pc_stack & rq_stack) */ | |
60 | DBG_PCRQ_STACK = (1 << 4), | |
61 | }; | |
62 | ||
63 | /* define to see debug info */ | |
64 | #define IDETAPE_DEBUG_LOG 0 | |
65 | ||
66 | #if IDETAPE_DEBUG_LOG | |
67 | #define debug_log(lvl, fmt, args...) \ | |
68 | { \ | |
69 | if (tape->debug_mask & lvl) \ | |
70 | printk(KERN_INFO "ide-tape: " fmt, ## args); \ | |
71 | } | |
72 | #else | |
73 | #define debug_log(lvl, fmt, args...) do {} while (0) | |
74 | #endif | |
75 | ||
1da177e4 | 76 | /**************************** Tunable parameters *****************************/ |
1da177e4 | 77 | /* |
3c98bf34 BP |
78 | * After each failed packet command we issue a request sense command and retry |
79 | * the packet command IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 80 | * |
3c98bf34 | 81 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
1da177e4 LT |
82 | */ |
83 | #define IDETAPE_MAX_PC_RETRIES 3 | |
84 | ||
85 | /* | |
3c98bf34 BP |
86 | * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE |
87 | * bytes. This is used for several packet commands (Not for READ/WRITE commands) | |
1da177e4 LT |
88 | */ |
89 | #define IDETAPE_PC_BUFFER_SIZE 256 | |
90 | ||
91 | /* | |
92 | * In various places in the driver, we need to allocate storage | |
93 | * for packet commands and requests, which will remain valid while | |
94 | * we leave the driver to wait for an interrupt or a timeout event. | |
95 | */ | |
96 | #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) | |
97 | ||
98 | /* | |
99 | * Some drives (for example, Seagate STT3401A Travan) require a very long | |
100 | * timeout, because they don't return an interrupt or clear their busy bit | |
101 | * until after the command completes (even retension commands). | |
102 | */ | |
103 | #define IDETAPE_WAIT_CMD (900*HZ) | |
104 | ||
105 | /* | |
3c98bf34 BP |
106 | * The following parameter is used to select the point in the internal tape fifo |
107 | * in which we will start to refill the buffer. Decreasing the following | |
108 | * parameter will improve the system's latency and interactive response, while | |
109 | * using a high value might improve system throughput. | |
1da177e4 | 110 | */ |
3c98bf34 | 111 | #define IDETAPE_FIFO_THRESHOLD 2 |
1da177e4 LT |
112 | |
113 | /* | |
3c98bf34 | 114 | * DSC polling parameters. |
1da177e4 | 115 | * |
3c98bf34 BP |
116 | * Polling for DSC (a single bit in the status register) is a very important |
117 | * function in ide-tape. There are two cases in which we poll for DSC: | |
1da177e4 | 118 | * |
3c98bf34 BP |
119 | * 1. Before a read/write packet command, to ensure that we can transfer data |
120 | * from/to the tape's data buffers, without causing an actual media access. | |
121 | * In case the tape is not ready yet, we take out our request from the device | |
122 | * request queue, so that ide.c could service requests from the other device | |
123 | * on the same interface in the meantime. | |
1da177e4 | 124 | * |
3c98bf34 BP |
125 | * 2. After the successful initialization of a "media access packet command", |
126 | * which is a command that can take a long time to complete (the interval can | |
127 | * range from several seconds to even an hour). Again, we postpone our request | |
128 | * in the middle to free the bus for the other device. The polling frequency | |
129 | * here should be lower than the read/write frequency since those media access | |
130 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST | |
131 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD | |
132 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). | |
1da177e4 | 133 | * |
3c98bf34 BP |
134 | * We also set a timeout for the timer, in case something goes wrong. The |
135 | * timeout should be longer then the maximum execution time of a tape operation. | |
1da177e4 | 136 | */ |
3c98bf34 BP |
137 | |
138 | /* DSC timings. */ | |
1da177e4 LT |
139 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
140 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ | |
141 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ | |
142 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ | |
143 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ | |
144 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ | |
145 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ | |
146 | ||
147 | /*************************** End of tunable parameters ***********************/ | |
148 | ||
54abf37e BP |
149 | /* tape directions */ |
150 | enum { | |
151 | IDETAPE_DIR_NONE = (1 << 0), | |
152 | IDETAPE_DIR_READ = (1 << 1), | |
153 | IDETAPE_DIR_WRITE = (1 << 2), | |
154 | }; | |
1da177e4 LT |
155 | |
156 | struct idetape_bh { | |
ab057968 | 157 | u32 b_size; |
1da177e4 LT |
158 | atomic_t b_count; |
159 | struct idetape_bh *b_reqnext; | |
160 | char *b_data; | |
161 | }; | |
162 | ||
03056b90 BP |
163 | /* Tape door status */ |
164 | #define DOOR_UNLOCKED 0 | |
165 | #define DOOR_LOCKED 1 | |
166 | #define DOOR_EXPLICITLY_LOCKED 2 | |
167 | ||
168 | /* Some defines for the SPACE command */ | |
169 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
170 | #define IDETAPE_SPACE_TO_EOD 3 | |
171 | ||
172 | /* Some defines for the LOAD UNLOAD command */ | |
173 | #define IDETAPE_LU_LOAD_MASK 1 | |
174 | #define IDETAPE_LU_RETENSION_MASK 2 | |
175 | #define IDETAPE_LU_EOT_MASK 4 | |
176 | ||
177 | /* | |
178 | * Special requests for our block device strategy routine. | |
179 | * | |
180 | * In order to service a character device command, we add special requests to | |
181 | * the tail of our block device request queue and wait for their completion. | |
182 | */ | |
183 | ||
184 | enum { | |
185 | REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ | |
186 | REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ | |
187 | REQ_IDETAPE_READ = (1 << 2), | |
188 | REQ_IDETAPE_WRITE = (1 << 3), | |
189 | }; | |
190 | ||
191 | /* Error codes returned in rq->errors to the higher part of the driver. */ | |
192 | #define IDETAPE_ERROR_GENERAL 101 | |
193 | #define IDETAPE_ERROR_FILEMARK 102 | |
194 | #define IDETAPE_ERROR_EOD 103 | |
195 | ||
196 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ | |
197 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
198 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
199 | ||
1da177e4 | 200 | /* |
3c98bf34 BP |
201 | * Most of our global data which we need to save even as we leave the driver due |
202 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
203 | */ |
204 | typedef struct ide_tape_obj { | |
205 | ide_drive_t *drive; | |
206 | ide_driver_t *driver; | |
207 | struct gendisk *disk; | |
208 | struct kref kref; | |
209 | ||
210 | /* | |
211 | * Since a typical character device operation requires more | |
212 | * than one packet command, we provide here enough memory | |
213 | * for the maximum of interconnected packet commands. | |
214 | * The packet commands are stored in the circular array pc_stack. | |
215 | * pc_stack_index points to the last used entry, and warps around | |
216 | * to the start when we get to the last array entry. | |
217 | * | |
218 | * pc points to the current processed packet command. | |
219 | * | |
220 | * failed_pc points to the last failed packet command, or contains | |
221 | * NULL if we do not need to retry any packet command. This is | |
222 | * required since an additional packet command is needed before the | |
223 | * retry, to get detailed information on what went wrong. | |
224 | */ | |
225 | /* Current packet command */ | |
d236d74c | 226 | struct ide_atapi_pc *pc; |
1da177e4 | 227 | /* Last failed packet command */ |
d236d74c | 228 | struct ide_atapi_pc *failed_pc; |
1da177e4 | 229 | /* Packet command stack */ |
d236d74c | 230 | struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK]; |
1da177e4 LT |
231 | /* Next free packet command storage space */ |
232 | int pc_stack_index; | |
233 | struct request rq_stack[IDETAPE_PC_STACK]; | |
234 | /* We implement a circular array */ | |
235 | int rq_stack_index; | |
236 | ||
237 | /* | |
3c98bf34 | 238 | * DSC polling variables. |
1da177e4 | 239 | * |
3c98bf34 BP |
240 | * While polling for DSC we use postponed_rq to postpone the current |
241 | * request so that ide.c will be able to service pending requests on the | |
242 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 243 | * data transfer) request in the device request queue. |
1da177e4 LT |
244 | */ |
245 | struct request *postponed_rq; | |
246 | /* The time in which we started polling for DSC */ | |
247 | unsigned long dsc_polling_start; | |
248 | /* Timer used to poll for dsc */ | |
249 | struct timer_list dsc_timer; | |
250 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
251 | unsigned long best_dsc_rw_freq; |
252 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
253 | unsigned long dsc_timeout; |
254 | ||
3c98bf34 | 255 | /* Read position information */ |
1da177e4 LT |
256 | u8 partition; |
257 | /* Current block */ | |
54bb2074 | 258 | unsigned int first_frame; |
1da177e4 | 259 | |
3c98bf34 | 260 | /* Last error information */ |
1da177e4 LT |
261 | u8 sense_key, asc, ascq; |
262 | ||
3c98bf34 | 263 | /* Character device operation */ |
1da177e4 LT |
264 | unsigned int minor; |
265 | /* device name */ | |
266 | char name[4]; | |
267 | /* Current character device data transfer direction */ | |
54abf37e | 268 | u8 chrdev_dir; |
1da177e4 | 269 | |
54bb2074 BP |
270 | /* tape block size, usually 512 or 1024 bytes */ |
271 | unsigned short blk_size; | |
1da177e4 | 272 | int user_bs_factor; |
b6422013 | 273 | |
1da177e4 | 274 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 275 | u8 caps[20]; |
1da177e4 LT |
276 | |
277 | /* | |
3c98bf34 | 278 | * Active data transfer request parameters. |
1da177e4 | 279 | * |
3c98bf34 BP |
280 | * At most, there is only one ide-tape originated data transfer request |
281 | * in the device request queue. This allows ide.c to easily service | |
282 | * requests from the other device when we postpone our active request. | |
1da177e4 | 283 | */ |
83042b24 | 284 | |
3c98bf34 | 285 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 286 | int buffer_size; |
077e3bdb BP |
287 | /* merge buffer */ |
288 | struct idetape_bh *merge_bh; | |
01a63aeb BP |
289 | /* size of the merge buffer */ |
290 | int merge_bh_size; | |
077e3bdb | 291 | /* pointer to current buffer head within the merge buffer */ |
1da177e4 LT |
292 | struct idetape_bh *bh; |
293 | char *b_data; | |
294 | int b_count; | |
3c98bf34 | 295 | |
a997a435 | 296 | int pages_per_buffer; |
1da177e4 LT |
297 | /* Wasted space in each stage */ |
298 | int excess_bh_size; | |
299 | ||
1da177e4 | 300 | /* protects the ide-tape queue */ |
54bb2074 | 301 | spinlock_t lock; |
1da177e4 | 302 | |
3c98bf34 | 303 | /* Measures average tape speed */ |
1da177e4 LT |
304 | unsigned long avg_time; |
305 | int avg_size; | |
306 | int avg_speed; | |
307 | ||
1da177e4 LT |
308 | /* the door is currently locked */ |
309 | int door_locked; | |
310 | /* the tape hardware is write protected */ | |
311 | char drv_write_prot; | |
312 | /* the tape is write protected (hardware or opened as read-only) */ | |
313 | char write_prot; | |
314 | ||
8004a8c9 | 315 | u32 debug_mask; |
1da177e4 LT |
316 | } idetape_tape_t; |
317 | ||
cf8b8975 | 318 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 319 | |
d5dee80a WD |
320 | static struct class *idetape_sysfs_class; |
321 | ||
1da177e4 LT |
322 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
323 | ||
324 | #define ide_tape_g(disk) \ | |
325 | container_of((disk)->private_data, struct ide_tape_obj, driver) | |
326 | ||
08da591e BZ |
327 | static void ide_tape_release(struct kref *); |
328 | ||
1da177e4 LT |
329 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
330 | { | |
331 | struct ide_tape_obj *tape = NULL; | |
332 | ||
cf8b8975 | 333 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 334 | tape = ide_tape_g(disk); |
08da591e | 335 | if (tape) { |
d3e33ff5 | 336 | if (ide_device_get(tape->drive)) |
08da591e | 337 | tape = NULL; |
d3e33ff5 BZ |
338 | else |
339 | kref_get(&tape->kref); | |
08da591e | 340 | } |
cf8b8975 | 341 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
342 | return tape; |
343 | } | |
344 | ||
1da177e4 LT |
345 | static void ide_tape_put(struct ide_tape_obj *tape) |
346 | { | |
d3e33ff5 BZ |
347 | ide_drive_t *drive = tape->drive; |
348 | ||
cf8b8975 | 349 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 350 | kref_put(&tape->kref, ide_tape_release); |
d3e33ff5 | 351 | ide_device_put(drive); |
cf8b8975 | 352 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
353 | } |
354 | ||
1da177e4 | 355 | /* |
3c98bf34 BP |
356 | * The variables below are used for the character device interface. Additional |
357 | * state variables are defined in our ide_drive_t structure. | |
1da177e4 | 358 | */ |
5a04cfa9 | 359 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
1da177e4 LT |
360 | |
361 | #define ide_tape_f(file) ((file)->private_data) | |
362 | ||
363 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) | |
364 | { | |
365 | struct ide_tape_obj *tape = NULL; | |
366 | ||
cf8b8975 | 367 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
368 | tape = idetape_devs[i]; |
369 | if (tape) | |
370 | kref_get(&tape->kref); | |
cf8b8975 | 371 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
372 | return tape; |
373 | } | |
374 | ||
d236d74c | 375 | static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 376 | unsigned int bcount) |
1da177e4 LT |
377 | { |
378 | struct idetape_bh *bh = pc->bh; | |
379 | int count; | |
380 | ||
381 | while (bcount) { | |
1da177e4 LT |
382 | if (bh == NULL) { |
383 | printk(KERN_ERR "ide-tape: bh == NULL in " | |
384 | "idetape_input_buffers\n"); | |
9f87abe8 | 385 | ide_pad_transfer(drive, 0, bcount); |
1da177e4 LT |
386 | return; |
387 | } | |
5a04cfa9 BP |
388 | count = min( |
389 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
390 | bcount); | |
374e042c | 391 | drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data + |
5a04cfa9 | 392 | atomic_read(&bh->b_count), count); |
1da177e4 LT |
393 | bcount -= count; |
394 | atomic_add(count, &bh->b_count); | |
395 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
396 | bh = bh->b_reqnext; | |
397 | if (bh) | |
398 | atomic_set(&bh->b_count, 0); | |
399 | } | |
400 | } | |
401 | pc->bh = bh; | |
402 | } | |
403 | ||
d236d74c | 404 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 405 | unsigned int bcount) |
1da177e4 LT |
406 | { |
407 | struct idetape_bh *bh = pc->bh; | |
408 | int count; | |
409 | ||
410 | while (bcount) { | |
1da177e4 | 411 | if (bh == NULL) { |
5a04cfa9 BP |
412 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
413 | __func__); | |
1da177e4 LT |
414 | return; |
415 | } | |
1da177e4 | 416 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
374e042c | 417 | drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); |
1da177e4 LT |
418 | bcount -= count; |
419 | pc->b_data += count; | |
420 | pc->b_count -= count; | |
421 | if (!pc->b_count) { | |
5a04cfa9 BP |
422 | bh = bh->b_reqnext; |
423 | pc->bh = bh; | |
1da177e4 LT |
424 | if (bh) { |
425 | pc->b_data = bh->b_data; | |
426 | pc->b_count = atomic_read(&bh->b_count); | |
427 | } | |
428 | } | |
429 | } | |
430 | } | |
431 | ||
646c0cb6 | 432 | static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
433 | { |
434 | struct idetape_bh *bh = pc->bh; | |
435 | int count; | |
d236d74c | 436 | unsigned int bcount = pc->xferred; |
1da177e4 | 437 | |
346331f8 | 438 | if (pc->flags & PC_FLAG_WRITING) |
1da177e4 LT |
439 | return; |
440 | while (bcount) { | |
1da177e4 | 441 | if (bh == NULL) { |
5a04cfa9 BP |
442 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
443 | __func__); | |
1da177e4 LT |
444 | return; |
445 | } | |
1da177e4 LT |
446 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
447 | atomic_set(&bh->b_count, count); | |
448 | if (atomic_read(&bh->b_count) == bh->b_size) | |
449 | bh = bh->b_reqnext; | |
450 | bcount -= count; | |
451 | } | |
452 | pc->bh = bh; | |
453 | } | |
454 | ||
455 | /* | |
456 | * idetape_next_pc_storage returns a pointer to a place in which we can | |
457 | * safely store a packet command, even though we intend to leave the | |
458 | * driver. A storage space for a maximum of IDETAPE_PC_STACK packet | |
459 | * commands is allocated at initialization time. | |
460 | */ | |
d236d74c | 461 | static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive) |
1da177e4 LT |
462 | { |
463 | idetape_tape_t *tape = drive->driver_data; | |
464 | ||
8004a8c9 BP |
465 | debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index); |
466 | ||
1da177e4 | 467 | if (tape->pc_stack_index == IDETAPE_PC_STACK) |
5a04cfa9 | 468 | tape->pc_stack_index = 0; |
1da177e4 LT |
469 | return (&tape->pc_stack[tape->pc_stack_index++]); |
470 | } | |
471 | ||
472 | /* | |
473 | * idetape_next_rq_storage is used along with idetape_next_pc_storage. | |
474 | * Since we queue packet commands in the request queue, we need to | |
475 | * allocate a request, along with the allocation of a packet command. | |
476 | */ | |
5a04cfa9 | 477 | |
1da177e4 LT |
478 | /************************************************************** |
479 | * * | |
480 | * This should get fixed to use kmalloc(.., GFP_ATOMIC) * | |
481 | * followed later on by kfree(). -ml * | |
482 | * * | |
483 | **************************************************************/ | |
5a04cfa9 BP |
484 | |
485 | static struct request *idetape_next_rq_storage(ide_drive_t *drive) | |
1da177e4 LT |
486 | { |
487 | idetape_tape_t *tape = drive->driver_data; | |
488 | ||
8004a8c9 BP |
489 | debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index); |
490 | ||
1da177e4 | 491 | if (tape->rq_stack_index == IDETAPE_PC_STACK) |
5a04cfa9 | 492 | tape->rq_stack_index = 0; |
1da177e4 LT |
493 | return (&tape->rq_stack[tape->rq_stack_index++]); |
494 | } | |
495 | ||
1da177e4 | 496 | /* |
1b5db434 BP |
497 | * called on each failed packet command retry to analyze the request sense. We |
498 | * currently do not utilize this information. | |
1da177e4 | 499 | */ |
1b5db434 | 500 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
501 | { |
502 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 503 | struct ide_atapi_pc *pc = tape->failed_pc; |
1da177e4 | 504 | |
1b5db434 BP |
505 | tape->sense_key = sense[2] & 0xF; |
506 | tape->asc = sense[12]; | |
507 | tape->ascq = sense[13]; | |
8004a8c9 BP |
508 | |
509 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
510 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 511 | |
d236d74c | 512 | /* Correct pc->xferred by asking the tape. */ |
346331f8 | 513 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
d236d74c | 514 | pc->xferred = pc->req_xfer - |
54bb2074 | 515 | tape->blk_size * |
5d0cc8ae | 516 | get_unaligned_be32(&sense[3]); |
646c0cb6 | 517 | idetape_update_buffers(drive, pc); |
1da177e4 LT |
518 | } |
519 | ||
520 | /* | |
521 | * If error was the result of a zero-length read or write command, | |
522 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
523 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
524 | */ | |
90699ce2 | 525 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
526 | /* length == 0 */ |
527 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
528 | if (tape->sense_key == 5) { | |
1da177e4 LT |
529 | /* don't report an error, everything's ok */ |
530 | pc->error = 0; | |
531 | /* don't retry read/write */ | |
346331f8 | 532 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
533 | } |
534 | } | |
90699ce2 | 535 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
1da177e4 | 536 | pc->error = IDETAPE_ERROR_FILEMARK; |
346331f8 | 537 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 538 | } |
90699ce2 | 539 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
540 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
541 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
1da177e4 | 542 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 543 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
544 | } |
545 | } | |
90699ce2 | 546 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 547 | if (tape->sense_key == 8) { |
1da177e4 | 548 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 549 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 550 | } |
346331f8 | 551 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 552 | pc->xferred) |
1da177e4 LT |
553 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
554 | } | |
555 | } | |
556 | ||
d01dbc3b | 557 | /* Free data buffers completely. */ |
077e3bdb | 558 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) |
1da177e4 | 559 | { |
077e3bdb | 560 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; |
d01dbc3b BP |
561 | |
562 | while (bh) { | |
563 | u32 size = bh->b_size; | |
564 | ||
565 | while (size) { | |
566 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
567 | ||
568 | if (bh->b_data) | |
569 | free_pages((unsigned long)bh->b_data, order); | |
570 | ||
571 | size &= (order-1); | |
572 | bh->b_data += (1 << order) * PAGE_SIZE; | |
1da177e4 LT |
573 | } |
574 | prev_bh = bh; | |
575 | bh = bh->b_reqnext; | |
576 | kfree(prev_bh); | |
577 | } | |
1da177e4 LT |
578 | } |
579 | ||
1da177e4 LT |
580 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
581 | { | |
582 | struct request *rq = HWGROUP(drive)->rq; | |
583 | idetape_tape_t *tape = drive->driver_data; | |
584 | unsigned long flags; | |
585 | int error; | |
1da177e4 | 586 | |
8004a8c9 | 587 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
588 | |
589 | switch (uptodate) { | |
5a04cfa9 BP |
590 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
591 | case 1: error = 0; break; | |
592 | default: error = uptodate; | |
1da177e4 LT |
593 | } |
594 | rq->errors = error; | |
595 | if (error) | |
596 | tape->failed_pc = NULL; | |
597 | ||
3687221f BZ |
598 | if (!blk_special_request(rq)) { |
599 | ide_end_request(drive, uptodate, nr_sects); | |
600 | return 0; | |
601 | } | |
602 | ||
54bb2074 | 603 | spin_lock_irqsave(&tape->lock, flags); |
1da177e4 | 604 | |
1da177e4 | 605 | ide_end_drive_cmd(drive, 0, 0); |
1da177e4 | 606 | |
54bb2074 | 607 | spin_unlock_irqrestore(&tape->lock, flags); |
1da177e4 LT |
608 | return 0; |
609 | } | |
610 | ||
92f5daff | 611 | static void ide_tape_callback(ide_drive_t *drive) |
1da177e4 LT |
612 | { |
613 | idetape_tape_t *tape = drive->driver_data; | |
5985e6ab BZ |
614 | struct ide_atapi_pc *pc = tape->pc; |
615 | int uptodate = pc->error ? 0 : 1; | |
1da177e4 | 616 | |
8004a8c9 BP |
617 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
618 | ||
dd2e9a03 BZ |
619 | if (tape->failed_pc == pc) |
620 | tape->failed_pc = NULL; | |
621 | ||
5985e6ab BZ |
622 | if (pc->c[0] == REQUEST_SENSE) { |
623 | if (uptodate) | |
624 | idetape_analyze_error(drive, pc->buf); | |
625 | else | |
626 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
627 | "itself - Aborting request!\n"); | |
628 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
629 | struct request *rq = drive->hwif->hwgroup->rq; | |
630 | int blocks = pc->xferred / tape->blk_size; | |
631 | ||
632 | tape->avg_size += blocks * tape->blk_size; | |
633 | ||
634 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
635 | tape->avg_speed = tape->avg_size * HZ / | |
636 | (jiffies - tape->avg_time) / 1024; | |
637 | tape->avg_size = 0; | |
638 | tape->avg_time = jiffies; | |
639 | } | |
640 | ||
641 | tape->first_frame += blocks; | |
642 | rq->current_nr_sectors -= blocks; | |
643 | ||
644 | if (pc->error) | |
645 | uptodate = pc->error; | |
646 | } else if (pc->c[0] == READ_POSITION && uptodate) { | |
647 | u8 *readpos = tape->pc->buf; | |
648 | ||
649 | debug_log(DBG_SENSE, "BOP - %s\n", | |
650 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
651 | debug_log(DBG_SENSE, "EOP - %s\n", | |
652 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
653 | ||
654 | if (readpos[0] & 0x4) { | |
655 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
656 | "to the tape\n"); | |
f2e3ab52 | 657 | clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab BZ |
658 | uptodate = 0; |
659 | } else { | |
660 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
cd740ab0 | 661 | be32_to_cpup((__be32 *)&readpos[4])); |
5985e6ab BZ |
662 | |
663 | tape->partition = readpos[1]; | |
cd740ab0 | 664 | tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); |
f2e3ab52 | 665 | set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); |
5985e6ab | 666 | } |
1da177e4 | 667 | } |
5985e6ab BZ |
668 | |
669 | idetape_end_request(drive, uptodate, 0); | |
1da177e4 LT |
670 | } |
671 | ||
5985e6ab BZ |
672 | static void idetape_init_pc(struct ide_atapi_pc *pc) |
673 | { | |
674 | memset(pc->c, 0, 12); | |
675 | pc->retries = 0; | |
676 | pc->flags = 0; | |
677 | pc->req_xfer = 0; | |
678 | pc->buf = pc->pc_buf; | |
679 | pc->buf_size = IDETAPE_PC_BUFFER_SIZE; | |
680 | pc->bh = NULL; | |
681 | pc->b_data = NULL; | |
1da177e4 LT |
682 | } |
683 | ||
d236d74c | 684 | static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 685 | { |
5a04cfa9 | 686 | idetape_init_pc(pc); |
90699ce2 | 687 | pc->c[0] = REQUEST_SENSE; |
1da177e4 | 688 | pc->c[4] = 20; |
d236d74c | 689 | pc->req_xfer = 20; |
1da177e4 LT |
690 | } |
691 | ||
1da177e4 | 692 | /* |
3c98bf34 BP |
693 | * Generate a new packet command request in front of the request queue, before |
694 | * the current request, so that it will be processed immediately, on the next | |
695 | * pass through the driver. The function below is called from the request | |
696 | * handling part of the driver (the "bottom" part). Safe storage for the request | |
697 | * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that. | |
1da177e4 | 698 | * |
3c98bf34 BP |
699 | * Memory for those requests is pre-allocated at initialization time, and is |
700 | * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for | |
701 | * the maximum possible number of inter-dependent packet commands. | |
1da177e4 | 702 | * |
3c98bf34 BP |
703 | * The higher level of the driver - The ioctl handler and the character device |
704 | * handling functions should queue request to the lower level part and wait for | |
705 | * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail. | |
1da177e4 | 706 | */ |
d236d74c | 707 | static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 708 | struct request *rq) |
1da177e4 LT |
709 | { |
710 | struct ide_tape_obj *tape = drive->driver_data; | |
711 | ||
f025ffdc BZ |
712 | blk_rq_init(NULL, rq); |
713 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
e8a96aa7 | 714 | rq->cmd_flags |= REQ_PREEMPT; |
1da177e4 LT |
715 | rq->buffer = (char *) pc; |
716 | rq->rq_disk = tape->disk; | |
0014c75b | 717 | memcpy(rq->cmd, pc->c, 12); |
f025ffdc | 718 | rq->cmd[13] = REQ_IDETAPE_PC1; |
63f5abb0 | 719 | ide_do_drive_cmd(drive, rq); |
1da177e4 LT |
720 | } |
721 | ||
722 | /* | |
723 | * idetape_retry_pc is called when an error was detected during the | |
724 | * last packet command. We queue a request sense packet command in | |
725 | * the head of the request list. | |
726 | */ | |
258ec411 | 727 | static void idetape_retry_pc(ide_drive_t *drive) |
1da177e4 | 728 | { |
d236d74c | 729 | struct ide_atapi_pc *pc; |
1da177e4 | 730 | struct request *rq; |
1da177e4 | 731 | |
64a57fe4 | 732 | (void)ide_read_error(drive); |
1da177e4 LT |
733 | pc = idetape_next_pc_storage(drive); |
734 | rq = idetape_next_rq_storage(drive); | |
735 | idetape_create_request_sense_cmd(pc); | |
f2e3ab52 | 736 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 | 737 | idetape_queue_pc_head(drive, pc, rq); |
1da177e4 LT |
738 | } |
739 | ||
740 | /* | |
3c98bf34 BP |
741 | * Postpone the current request so that ide.c will be able to service requests |
742 | * from another device on the same hwgroup while we are polling for DSC. | |
1da177e4 | 743 | */ |
5a04cfa9 | 744 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
745 | { |
746 | idetape_tape_t *tape = drive->driver_data; | |
747 | ||
8004a8c9 BP |
748 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
749 | ||
1da177e4 | 750 | tape->postponed_rq = HWGROUP(drive)->rq; |
54bb2074 | 751 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
752 | } |
753 | ||
74e63e74 BZ |
754 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
755 | { | |
756 | idetape_tape_t *tape = drive->driver_data; | |
757 | ||
758 | /* Media access command */ | |
759 | tape->dsc_polling_start = jiffies; | |
760 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
761 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
762 | /* Allow ide.c to handle other requests */ | |
763 | idetape_postpone_request(drive); | |
764 | } | |
765 | ||
08424ac2 BZ |
766 | static void ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
767 | unsigned int bcount, int write) | |
768 | { | |
769 | if (write) | |
770 | idetape_output_buffers(drive, pc, bcount); | |
771 | else | |
772 | idetape_input_buffers(drive, pc, bcount); | |
773 | } | |
a1efc85f | 774 | |
1da177e4 | 775 | /* |
a1efc85f BP |
776 | * This is the usual interrupt handler which will be called during a packet |
777 | * command. We will transfer some of the data (as requested by the drive) and | |
778 | * will re-point interrupt handler to us. When data transfer is finished, we | |
779 | * will act according to the algorithm described before | |
8d06bfad | 780 | * idetape_issue_pc. |
1da177e4 | 781 | */ |
a1efc85f | 782 | static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) |
1da177e4 | 783 | { |
1da177e4 | 784 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 785 | |
646c0cb6 BZ |
786 | return ide_pc_intr(drive, tape->pc, idetape_pc_intr, IDETAPE_WAIT_CMD, |
787 | NULL, idetape_update_buffers, idetape_retry_pc, | |
788 | ide_tape_handle_dsc, ide_tape_io_buffers); | |
1da177e4 LT |
789 | } |
790 | ||
791 | /* | |
3c98bf34 | 792 | * Packet Command Interface |
1da177e4 | 793 | * |
3c98bf34 BP |
794 | * The current Packet Command is available in tape->pc, and will not change |
795 | * until we finish handling it. Each packet command is associated with a | |
796 | * callback function that will be called when the command is finished. | |
1da177e4 | 797 | * |
3c98bf34 | 798 | * The handling will be done in three stages: |
1da177e4 | 799 | * |
3c98bf34 BP |
800 | * 1. idetape_issue_pc will send the packet command to the drive, and will set |
801 | * the interrupt handler to idetape_pc_intr. | |
1da177e4 | 802 | * |
3c98bf34 BP |
803 | * 2. On each interrupt, idetape_pc_intr will be called. This step will be |
804 | * repeated until the device signals us that no more interrupts will be issued. | |
1da177e4 | 805 | * |
3c98bf34 BP |
806 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
807 | * process. In case of a successful initiation of a media access packet command, | |
808 | * the DSC bit will be set when the actual execution of the command is finished. | |
809 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
810 | * event. In this case, we define the request as "low priority request" by | |
811 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
812 | * exit the driver. | |
1da177e4 | 813 | * |
3c98bf34 BP |
814 | * ide.c will then give higher priority to requests which originate from the |
815 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 816 | * |
3c98bf34 | 817 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 818 | * |
3c98bf34 BP |
819 | * 5. In case an error was found, we queue a request sense packet command in |
820 | * front of the request queue and retry the operation up to | |
821 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 822 | * |
3c98bf34 BP |
823 | * 6. In case no error was found, or we decided to give up and not to retry |
824 | * again, the callback function will be called and then we will handle the next | |
825 | * request. | |
1da177e4 LT |
826 | */ |
827 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) | |
828 | { | |
1da177e4 | 829 | idetape_tape_t *tape = drive->driver_data; |
9567b349 | 830 | |
594c16d8 BZ |
831 | return ide_transfer_pc(drive, tape->pc, idetape_pc_intr, |
832 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
833 | } |
834 | ||
d236d74c BP |
835 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
836 | struct ide_atapi_pc *pc) | |
1da177e4 | 837 | { |
1da177e4 | 838 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 839 | |
90699ce2 BP |
840 | if (tape->pc->c[0] == REQUEST_SENSE && |
841 | pc->c[0] == REQUEST_SENSE) { | |
1da177e4 LT |
842 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
843 | "Two request sense in serial were issued\n"); | |
844 | } | |
1da177e4 | 845 | |
90699ce2 | 846 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
1da177e4 LT |
847 | tape->failed_pc = pc; |
848 | /* Set the current packet command */ | |
849 | tape->pc = pc; | |
850 | ||
851 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 852 | (pc->flags & PC_FLAG_ABORT)) { |
1da177e4 | 853 | /* |
3c98bf34 BP |
854 | * We will "abort" retrying a packet command in case legitimate |
855 | * error code was received (crossing a filemark, or end of the | |
856 | * media, for example). | |
1da177e4 | 857 | */ |
346331f8 | 858 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 859 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
860 | tape->sense_key == 2 && tape->asc == 4 && |
861 | (tape->ascq == 1 || tape->ascq == 8))) { | |
862 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
863 | "pc = %2x, key = %2x, " | |
864 | "asc = %2x, ascq = %2x\n", | |
865 | tape->name, pc->c[0], | |
866 | tape->sense_key, tape->asc, | |
867 | tape->ascq); | |
868 | } | |
869 | /* Giving up */ | |
870 | pc->error = IDETAPE_ERROR_GENERAL; | |
871 | } | |
872 | tape->failed_pc = NULL; | |
776bb027 | 873 | drive->pc_callback(drive); |
92f5daff | 874 | return ide_stopped; |
1da177e4 | 875 | } |
8004a8c9 | 876 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
877 | |
878 | pc->retries++; | |
1da177e4 | 879 | |
6bf1641c BZ |
880 | return ide_issue_pc(drive, pc, idetape_transfer_pc, |
881 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
882 | } |
883 | ||
3c98bf34 | 884 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 885 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 LT |
886 | { |
887 | idetape_init_pc(pc); | |
90699ce2 | 888 | pc->c[0] = MODE_SENSE; |
1da177e4 | 889 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
890 | /* DBD = 1 - Don't return block descriptors */ |
891 | pc->c[1] = 8; | |
1da177e4 LT |
892 | pc->c[2] = page_code; |
893 | /* | |
894 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
895 | * | |
896 | * For SCSI this byte is defined as subpage instead of high byte | |
897 | * of length and some IDE drives seem to interpret it this way | |
898 | * and return an error when 255 is used. | |
899 | */ | |
900 | pc->c[3] = 0; | |
3c98bf34 BP |
901 | /* We will just discard data in that case */ |
902 | pc->c[4] = 255; | |
1da177e4 | 903 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 904 | pc->req_xfer = 12; |
1da177e4 | 905 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 906 | pc->req_xfer = 24; |
1da177e4 | 907 | else |
d236d74c | 908 | pc->req_xfer = 50; |
1da177e4 LT |
909 | } |
910 | ||
5a04cfa9 | 911 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 | 912 | { |
b73c7ee2 | 913 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 914 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 915 | struct ide_atapi_pc *pc = tape->pc; |
22c525b9 | 916 | u8 stat; |
1da177e4 | 917 | |
374e042c | 918 | stat = hwif->tp_ops->read_status(hwif); |
c47137a9 | 919 | |
3a7d2484 BZ |
920 | if (stat & ATA_DSC) { |
921 | if (stat & ATA_ERR) { | |
1da177e4 | 922 | /* Error detected */ |
90699ce2 | 923 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
924 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
925 | tape->name); | |
926 | /* Retry operation */ | |
258ec411 BZ |
927 | idetape_retry_pc(drive); |
928 | return ide_stopped; | |
1da177e4 LT |
929 | } |
930 | pc->error = 0; | |
1da177e4 LT |
931 | } else { |
932 | pc->error = IDETAPE_ERROR_GENERAL; | |
933 | tape->failed_pc = NULL; | |
934 | } | |
776bb027 | 935 | drive->pc_callback(drive); |
1da177e4 LT |
936 | return ide_stopped; |
937 | } | |
938 | ||
cd2abbfe | 939 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
0014c75b BP |
940 | struct ide_atapi_pc *pc, struct request *rq, |
941 | u8 opcode) | |
1da177e4 | 942 | { |
0014c75b BP |
943 | struct idetape_bh *bh = (struct idetape_bh *)rq->special; |
944 | unsigned int length = rq->current_nr_sectors; | |
945 | ||
1da177e4 | 946 | idetape_init_pc(pc); |
860ff5ec | 947 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 948 | pc->c[1] = 1; |
1da177e4 | 949 | pc->bh = bh; |
d236d74c BP |
950 | pc->buf = NULL; |
951 | pc->buf_size = length * tape->blk_size; | |
952 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 953 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 954 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 | 955 | |
cd2abbfe BP |
956 | if (opcode == READ_6) { |
957 | pc->c[0] = READ_6; | |
958 | atomic_set(&bh->b_count, 0); | |
959 | } else if (opcode == WRITE_6) { | |
960 | pc->c[0] = WRITE_6; | |
961 | pc->flags |= PC_FLAG_WRITING; | |
962 | pc->b_data = bh->b_data; | |
963 | pc->b_count = atomic_read(&bh->b_count); | |
964 | } | |
0014c75b BP |
965 | |
966 | memcpy(rq->cmd, pc->c, 12); | |
1da177e4 LT |
967 | } |
968 | ||
1da177e4 LT |
969 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
970 | struct request *rq, sector_t block) | |
971 | { | |
b73c7ee2 | 972 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 973 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 974 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 975 | struct request *postponed_rq = tape->postponed_rq; |
22c525b9 | 976 | u8 stat; |
1da177e4 | 977 | |
730616b2 MW |
978 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu," |
979 | " current_nr_sectors: %u\n", | |
980 | (unsigned long long)rq->sector, rq->nr_sectors, | |
981 | rq->current_nr_sectors); | |
1da177e4 | 982 | |
4aff5e23 | 983 | if (!blk_special_request(rq)) { |
3c98bf34 | 984 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 985 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 986 | "request queue (%d)\n", drive->name, rq->cmd_type); |
1da177e4 LT |
987 | ide_end_request(drive, 0, 0); |
988 | return ide_stopped; | |
989 | } | |
990 | ||
3c98bf34 | 991 | /* Retry a failed packet command */ |
28c7214b BZ |
992 | if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) { |
993 | pc = tape->failed_pc; | |
994 | goto out; | |
995 | } | |
5a04cfa9 | 996 | |
1da177e4 LT |
997 | if (postponed_rq != NULL) |
998 | if (rq != postponed_rq) { | |
999 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
1000 | "Two DSC requests were queued\n"); | |
1001 | idetape_end_request(drive, 0, 0); | |
1002 | return ide_stopped; | |
1003 | } | |
1da177e4 LT |
1004 | |
1005 | tape->postponed_rq = NULL; | |
1006 | ||
1007 | /* | |
1008 | * If the tape is still busy, postpone our request and service | |
1009 | * the other device meanwhile. | |
1010 | */ | |
374e042c | 1011 | stat = hwif->tp_ops->read_status(hwif); |
1da177e4 | 1012 | |
83dd5735 | 1013 | if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2)) |
f2e3ab52 | 1014 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 LT |
1015 | |
1016 | if (drive->post_reset == 1) { | |
f2e3ab52 | 1017 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); |
1da177e4 LT |
1018 | drive->post_reset = 0; |
1019 | } | |
1020 | ||
f2e3ab52 | 1021 | if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && |
3a7d2484 | 1022 | (stat & ATA_DSC) == 0) { |
1da177e4 LT |
1023 | if (postponed_rq == NULL) { |
1024 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 1025 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
1026 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
1027 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
1028 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
1029 | tape->name); | |
83dd5735 | 1030 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
1031 | idetape_media_access_finished(drive); |
1032 | return ide_stopped; | |
1033 | } else { | |
1034 | return ide_do_reset(drive); | |
1035 | } | |
5a04cfa9 BP |
1036 | } else if (time_after(jiffies, |
1037 | tape->dsc_polling_start + | |
1038 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 1039 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
1040 | idetape_postpone_request(drive); |
1041 | return ide_stopped; | |
1042 | } | |
83dd5735 | 1043 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
1da177e4 | 1044 | pc = idetape_next_pc_storage(drive); |
0014c75b | 1045 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
1da177e4 LT |
1046 | goto out; |
1047 | } | |
83dd5735 | 1048 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
1da177e4 | 1049 | pc = idetape_next_pc_storage(drive); |
0014c75b | 1050 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
1da177e4 LT |
1051 | goto out; |
1052 | } | |
83dd5735 | 1053 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
d236d74c | 1054 | pc = (struct ide_atapi_pc *) rq->buffer; |
83dd5735 BP |
1055 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
1056 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
1da177e4 LT |
1057 | goto out; |
1058 | } | |
83dd5735 | 1059 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
1da177e4 LT |
1060 | idetape_media_access_finished(drive); |
1061 | return ide_stopped; | |
1062 | } | |
1063 | BUG(); | |
28c7214b | 1064 | |
f2e3ab52 | 1065 | out: |
8d06bfad | 1066 | return idetape_issue_pc(drive, pc); |
1da177e4 LT |
1067 | } |
1068 | ||
1da177e4 | 1069 | /* |
41aa1706 | 1070 | * The function below uses __get_free_pages to allocate a data buffer of size |
f73850a3 | 1071 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
3c98bf34 | 1072 | * much as possible. |
1da177e4 | 1073 | * |
41aa1706 BP |
1074 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
1075 | * failure. | |
1da177e4 | 1076 | */ |
077e3bdb BP |
1077 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, |
1078 | int full, int clear) | |
1da177e4 | 1079 | { |
077e3bdb | 1080 | struct idetape_bh *prev_bh, *bh, *merge_bh; |
a997a435 | 1081 | int pages = tape->pages_per_buffer; |
41aa1706 | 1082 | unsigned int order, b_allocd; |
1da177e4 LT |
1083 | char *b_data = NULL; |
1084 | ||
077e3bdb BP |
1085 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1086 | bh = merge_bh; | |
1da177e4 LT |
1087 | if (bh == NULL) |
1088 | goto abort; | |
41aa1706 BP |
1089 | |
1090 | order = fls(pages) - 1; | |
1091 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 1092 | if (!bh->b_data) |
1da177e4 | 1093 | goto abort; |
41aa1706 BP |
1094 | b_allocd = (1 << order) * PAGE_SIZE; |
1095 | pages &= (order-1); | |
1096 | ||
1da177e4 | 1097 | if (clear) |
41aa1706 BP |
1098 | memset(bh->b_data, 0, b_allocd); |
1099 | bh->b_reqnext = NULL; | |
1100 | bh->b_size = b_allocd; | |
1da177e4 LT |
1101 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1102 | ||
41aa1706 BP |
1103 | while (pages) { |
1104 | order = fls(pages) - 1; | |
1105 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 1106 | if (!b_data) |
1da177e4 | 1107 | goto abort; |
41aa1706 BP |
1108 | b_allocd = (1 << order) * PAGE_SIZE; |
1109 | ||
1da177e4 | 1110 | if (clear) |
41aa1706 BP |
1111 | memset(b_data, 0, b_allocd); |
1112 | ||
1113 | /* newly allocated page frames below buffer header or ...*/ | |
1114 | if (bh->b_data == b_data + b_allocd) { | |
1115 | bh->b_size += b_allocd; | |
1116 | bh->b_data -= b_allocd; | |
1da177e4 | 1117 | if (full) |
41aa1706 | 1118 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1119 | continue; |
1120 | } | |
41aa1706 | 1121 | /* they are above the header */ |
1da177e4 | 1122 | if (b_data == bh->b_data + bh->b_size) { |
41aa1706 | 1123 | bh->b_size += b_allocd; |
1da177e4 | 1124 | if (full) |
41aa1706 | 1125 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1126 | continue; |
1127 | } | |
1128 | prev_bh = bh; | |
5a04cfa9 BP |
1129 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1130 | if (!bh) { | |
41aa1706 | 1131 | free_pages((unsigned long) b_data, order); |
1da177e4 LT |
1132 | goto abort; |
1133 | } | |
1134 | bh->b_reqnext = NULL; | |
1135 | bh->b_data = b_data; | |
41aa1706 | 1136 | bh->b_size = b_allocd; |
1da177e4 LT |
1137 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1138 | prev_bh->b_reqnext = bh; | |
41aa1706 BP |
1139 | |
1140 | pages &= (order-1); | |
1da177e4 | 1141 | } |
41aa1706 | 1142 | |
1da177e4 LT |
1143 | bh->b_size -= tape->excess_bh_size; |
1144 | if (full) | |
1145 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
077e3bdb | 1146 | return merge_bh; |
1da177e4 | 1147 | abort: |
077e3bdb | 1148 | ide_tape_kfree_buffer(tape); |
1da177e4 LT |
1149 | return NULL; |
1150 | } | |
1151 | ||
5a04cfa9 | 1152 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
8646c88f | 1153 | const char __user *buf, int n) |
1da177e4 LT |
1154 | { |
1155 | struct idetape_bh *bh = tape->bh; | |
1156 | int count; | |
dcd96379 | 1157 | int ret = 0; |
1da177e4 LT |
1158 | |
1159 | while (n) { | |
1da177e4 | 1160 | if (bh == NULL) { |
5a04cfa9 BP |
1161 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1162 | __func__); | |
dcd96379 | 1163 | return 1; |
1da177e4 | 1164 | } |
5a04cfa9 BP |
1165 | count = min((unsigned int) |
1166 | (bh->b_size - atomic_read(&bh->b_count)), | |
1167 | (unsigned int)n); | |
1168 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
1169 | count)) | |
dcd96379 | 1170 | ret = 1; |
1da177e4 LT |
1171 | n -= count; |
1172 | atomic_add(count, &bh->b_count); | |
1173 | buf += count; | |
1174 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
1175 | bh = bh->b_reqnext; | |
1176 | if (bh) | |
1177 | atomic_set(&bh->b_count, 0); | |
1178 | } | |
1179 | } | |
1180 | tape->bh = bh; | |
dcd96379 | 1181 | return ret; |
1da177e4 LT |
1182 | } |
1183 | ||
5a04cfa9 | 1184 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
99d74e61 | 1185 | int n) |
1da177e4 LT |
1186 | { |
1187 | struct idetape_bh *bh = tape->bh; | |
1188 | int count; | |
dcd96379 | 1189 | int ret = 0; |
1da177e4 LT |
1190 | |
1191 | while (n) { | |
1da177e4 | 1192 | if (bh == NULL) { |
5a04cfa9 BP |
1193 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1194 | __func__); | |
dcd96379 | 1195 | return 1; |
1da177e4 | 1196 | } |
1da177e4 | 1197 | count = min(tape->b_count, n); |
dcd96379 DW |
1198 | if (copy_to_user(buf, tape->b_data, count)) |
1199 | ret = 1; | |
1da177e4 LT |
1200 | n -= count; |
1201 | tape->b_data += count; | |
1202 | tape->b_count -= count; | |
1203 | buf += count; | |
1204 | if (!tape->b_count) { | |
5a04cfa9 BP |
1205 | bh = bh->b_reqnext; |
1206 | tape->bh = bh; | |
1da177e4 LT |
1207 | if (bh) { |
1208 | tape->b_data = bh->b_data; | |
1209 | tape->b_count = atomic_read(&bh->b_count); | |
1210 | } | |
1211 | } | |
1212 | } | |
dcd96379 | 1213 | return ret; |
1da177e4 LT |
1214 | } |
1215 | ||
077e3bdb | 1216 | static void idetape_init_merge_buffer(idetape_tape_t *tape) |
1da177e4 | 1217 | { |
077e3bdb BP |
1218 | struct idetape_bh *bh = tape->merge_bh; |
1219 | tape->bh = tape->merge_bh; | |
5a04cfa9 | 1220 | |
54abf37e | 1221 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 LT |
1222 | atomic_set(&bh->b_count, 0); |
1223 | else { | |
1224 | tape->b_data = bh->b_data; | |
1225 | tape->b_count = atomic_read(&bh->b_count); | |
1226 | } | |
1227 | } | |
1228 | ||
1da177e4 | 1229 | /* |
3c98bf34 BP |
1230 | * Write a filemark if write_filemark=1. Flush the device buffers without |
1231 | * writing a filemark otherwise. | |
1da177e4 | 1232 | */ |
5a04cfa9 | 1233 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 1234 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 LT |
1235 | { |
1236 | idetape_init_pc(pc); | |
90699ce2 | 1237 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 1238 | pc->c[4] = write_filemark; |
346331f8 | 1239 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1240 | } |
1241 | ||
d236d74c | 1242 | static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1243 | { |
1244 | idetape_init_pc(pc); | |
90699ce2 | 1245 | pc->c[0] = TEST_UNIT_READY; |
1da177e4 LT |
1246 | } |
1247 | ||
1248 | /* | |
3c98bf34 BP |
1249 | * We add a special packet command request to the tail of the request queue, and |
1250 | * wait for it to be serviced. This is not to be called from within the request | |
1251 | * handling part of the driver! We allocate here data on the stack and it is | |
1252 | * valid until the request is finished. This is not the case for the bottom part | |
1253 | * of the driver, where we are always leaving the functions to wait for an | |
1254 | * interrupt or a timer event. | |
1da177e4 | 1255 | * |
3c98bf34 BP |
1256 | * From the bottom part of the driver, we should allocate safe memory using |
1257 | * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request | |
1258 | * to the request list without waiting for it to be serviced! In that case, we | |
1259 | * usually use idetape_queue_pc_head(). | |
1da177e4 | 1260 | */ |
ea1ab3d3 | 1261 | static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
1262 | { |
1263 | struct ide_tape_obj *tape = drive->driver_data; | |
64ea1b4a FT |
1264 | struct request *rq; |
1265 | int error; | |
1da177e4 | 1266 | |
64ea1b4a FT |
1267 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1268 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1269 | rq->cmd[13] = REQ_IDETAPE_PC1; |
64ea1b4a | 1270 | rq->buffer = (char *)pc; |
0014c75b | 1271 | memcpy(rq->cmd, pc->c, 12); |
64ea1b4a FT |
1272 | error = blk_execute_rq(drive->queue, tape->disk, rq, 0); |
1273 | blk_put_request(rq); | |
1274 | return error; | |
1da177e4 LT |
1275 | } |
1276 | ||
d236d74c BP |
1277 | static void idetape_create_load_unload_cmd(ide_drive_t *drive, |
1278 | struct ide_atapi_pc *pc, int cmd) | |
1da177e4 LT |
1279 | { |
1280 | idetape_init_pc(pc); | |
90699ce2 | 1281 | pc->c[0] = START_STOP; |
1da177e4 | 1282 | pc->c[4] = cmd; |
346331f8 | 1283 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1284 | } |
1285 | ||
1286 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) | |
1287 | { | |
1288 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1289 | struct ide_atapi_pc pc; |
1da177e4 LT |
1290 | int load_attempted = 0; |
1291 | ||
3c98bf34 | 1292 | /* Wait for the tape to become ready */ |
f2e3ab52 | 1293 | set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
1da177e4 LT |
1294 | timeout += jiffies; |
1295 | while (time_before(jiffies, timeout)) { | |
1296 | idetape_create_test_unit_ready_cmd(&pc); | |
ea1ab3d3 | 1297 | if (!idetape_queue_pc_tail(drive, &pc)) |
1da177e4 LT |
1298 | return 0; |
1299 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
1300 | || (tape->asc == 0x3A)) { |
1301 | /* no media */ | |
1da177e4 LT |
1302 | if (load_attempted) |
1303 | return -ENOMEDIUM; | |
5a04cfa9 BP |
1304 | idetape_create_load_unload_cmd(drive, &pc, |
1305 | IDETAPE_LU_LOAD_MASK); | |
ea1ab3d3 | 1306 | idetape_queue_pc_tail(drive, &pc); |
1da177e4 LT |
1307 | load_attempted = 1; |
1308 | /* not about to be ready */ | |
1309 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1310 | (tape->ascq == 1 || tape->ascq == 8))) | |
1311 | return -EIO; | |
80ce45fd | 1312 | msleep(100); |
1da177e4 LT |
1313 | } |
1314 | return -EIO; | |
1315 | } | |
1316 | ||
5a04cfa9 | 1317 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 1318 | { |
d236d74c | 1319 | struct ide_atapi_pc pc; |
1da177e4 LT |
1320 | int rc; |
1321 | ||
1322 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
5a04cfa9 BP |
1323 | rc = idetape_queue_pc_tail(drive, &pc); |
1324 | if (rc) | |
1da177e4 LT |
1325 | return rc; |
1326 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1327 | return 0; | |
1328 | } | |
1329 | ||
d236d74c | 1330 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1331 | { |
1332 | idetape_init_pc(pc); | |
90699ce2 | 1333 | pc->c[0] = READ_POSITION; |
d236d74c | 1334 | pc->req_xfer = 20; |
1da177e4 LT |
1335 | } |
1336 | ||
5a04cfa9 | 1337 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
1338 | { |
1339 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1340 | struct ide_atapi_pc pc; |
1da177e4 LT |
1341 | int position; |
1342 | ||
8004a8c9 | 1343 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
1344 | |
1345 | idetape_create_read_position_cmd(&pc); | |
1346 | if (idetape_queue_pc_tail(drive, &pc)) | |
1347 | return -1; | |
54bb2074 | 1348 | position = tape->first_frame; |
1da177e4 LT |
1349 | return position; |
1350 | } | |
1351 | ||
d236d74c BP |
1352 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
1353 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1354 | unsigned int block, u8 partition, int skip) |
1da177e4 LT |
1355 | { |
1356 | idetape_init_pc(pc); | |
90699ce2 | 1357 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 1358 | pc->c[1] = 2; |
860ff5ec | 1359 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 1360 | pc->c[8] = partition; |
346331f8 | 1361 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1362 | } |
1363 | ||
d236d74c BP |
1364 | static int idetape_create_prevent_cmd(ide_drive_t *drive, |
1365 | struct ide_atapi_pc *pc, int prevent) | |
1da177e4 LT |
1366 | { |
1367 | idetape_tape_t *tape = drive->driver_data; | |
1368 | ||
b6422013 BP |
1369 | /* device supports locking according to capabilities page */ |
1370 | if (!(tape->caps[6] & 0x01)) | |
1da177e4 LT |
1371 | return 0; |
1372 | ||
1373 | idetape_init_pc(pc); | |
90699ce2 | 1374 | pc->c[0] = ALLOW_MEDIUM_REMOVAL; |
1da177e4 | 1375 | pc->c[4] = prevent; |
1da177e4 LT |
1376 | return 1; |
1377 | } | |
1378 | ||
ec0fdb01 | 1379 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1380 | { |
1381 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1382 | |
54abf37e | 1383 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 1384 | return; |
1da177e4 | 1385 | |
f2e3ab52 | 1386 | clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); |
01a63aeb | 1387 | tape->merge_bh_size = 0; |
077e3bdb BP |
1388 | if (tape->merge_bh != NULL) { |
1389 | ide_tape_kfree_buffer(tape); | |
1390 | tape->merge_bh = NULL; | |
1da177e4 LT |
1391 | } |
1392 | ||
54abf37e | 1393 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1394 | } |
1395 | ||
1396 | /* | |
3c98bf34 BP |
1397 | * Position the tape to the requested block using the LOCATE packet command. |
1398 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1399 | * all higher level operations, we queue the commands at the tail of the request | |
1400 | * queue and wait for their completion. | |
1da177e4 | 1401 | */ |
5a04cfa9 BP |
1402 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
1403 | u8 partition, int skip) | |
1da177e4 LT |
1404 | { |
1405 | idetape_tape_t *tape = drive->driver_data; | |
1406 | int retval; | |
d236d74c | 1407 | struct ide_atapi_pc pc; |
1da177e4 | 1408 | |
54abf37e | 1409 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 1410 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1411 | idetape_wait_ready(drive, 60 * 5 * HZ); |
1412 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
1413 | retval = idetape_queue_pc_tail(drive, &pc); | |
1414 | if (retval) | |
1415 | return (retval); | |
1416 | ||
1417 | idetape_create_read_position_cmd(&pc); | |
1418 | return (idetape_queue_pc_tail(drive, &pc)); | |
1419 | } | |
1420 | ||
ec0fdb01 | 1421 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 1422 | int restore_position) |
1da177e4 LT |
1423 | { |
1424 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1425 | int seek, position; |
1426 | ||
ec0fdb01 | 1427 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1428 | if (restore_position) { |
1429 | position = idetape_read_position(drive); | |
9798630a | 1430 | seek = position > 0 ? position : 0; |
1da177e4 | 1431 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 1432 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 1433 | " %s\n", tape->name, __func__); |
1da177e4 LT |
1434 | return; |
1435 | } | |
1436 | } | |
1437 | } | |
1438 | ||
1439 | /* | |
3c98bf34 BP |
1440 | * Generate a read/write request for the block device interface and wait for it |
1441 | * to be serviced. | |
1da177e4 | 1442 | */ |
5a04cfa9 BP |
1443 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
1444 | struct idetape_bh *bh) | |
1da177e4 LT |
1445 | { |
1446 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a FT |
1447 | struct request *rq; |
1448 | int ret, errors; | |
1da177e4 | 1449 | |
8004a8c9 BP |
1450 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
1451 | ||
64ea1b4a FT |
1452 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1453 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
83dd5735 | 1454 | rq->cmd[13] = cmd; |
64ea1b4a FT |
1455 | rq->rq_disk = tape->disk; |
1456 | rq->special = (void *)bh; | |
1457 | rq->sector = tape->first_frame; | |
1458 | rq->nr_sectors = blocks; | |
1459 | rq->current_nr_sectors = blocks; | |
1460 | blk_execute_rq(drive->queue, tape->disk, rq, 0); | |
1461 | ||
1462 | errors = rq->errors; | |
1463 | ret = tape->blk_size * (blocks - rq->current_nr_sectors); | |
1464 | blk_put_request(rq); | |
1da177e4 LT |
1465 | |
1466 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1467 | return 0; | |
1468 | ||
077e3bdb BP |
1469 | if (tape->merge_bh) |
1470 | idetape_init_merge_buffer(tape); | |
64ea1b4a | 1471 | if (errors == IDETAPE_ERROR_GENERAL) |
1da177e4 | 1472 | return -EIO; |
64ea1b4a | 1473 | return ret; |
1da177e4 LT |
1474 | } |
1475 | ||
d236d74c | 1476 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1477 | { |
1478 | idetape_init_pc(pc); | |
90699ce2 | 1479 | pc->c[0] = INQUIRY; |
5a04cfa9 | 1480 | pc->c[4] = 254; |
d236d74c | 1481 | pc->req_xfer = 254; |
1da177e4 LT |
1482 | } |
1483 | ||
d236d74c BP |
1484 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
1485 | struct ide_atapi_pc *pc) | |
1da177e4 LT |
1486 | { |
1487 | idetape_init_pc(pc); | |
90699ce2 | 1488 | pc->c[0] = REZERO_UNIT; |
346331f8 | 1489 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1490 | } |
1491 | ||
d236d74c | 1492 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1493 | { |
1494 | idetape_init_pc(pc); | |
90699ce2 | 1495 | pc->c[0] = ERASE; |
1da177e4 | 1496 | pc->c[1] = 1; |
346331f8 | 1497 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1498 | } |
1499 | ||
d236d74c | 1500 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 LT |
1501 | { |
1502 | idetape_init_pc(pc); | |
90699ce2 | 1503 | pc->c[0] = SPACE; |
860ff5ec | 1504 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 1505 | pc->c[1] = cmd; |
346331f8 | 1506 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1507 | } |
1508 | ||
97c566ce | 1509 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 1510 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1511 | { |
1512 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1513 | |
8004a8c9 | 1514 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 1515 | |
0aa4b01e | 1516 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
077e3bdb | 1517 | blocks, tape->merge_bh); |
1da177e4 LT |
1518 | } |
1519 | ||
d9df937a | 1520 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1521 | { |
1522 | idetape_tape_t *tape = drive->driver_data; | |
1523 | int blocks, min; | |
1524 | struct idetape_bh *bh; | |
55a5d291 | 1525 | |
54abf37e | 1526 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 1527 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 1528 | " but we are not writing.\n"); |
1da177e4 LT |
1529 | return; |
1530 | } | |
01a63aeb | 1531 | if (tape->merge_bh_size > tape->buffer_size) { |
1da177e4 | 1532 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
01a63aeb | 1533 | tape->merge_bh_size = tape->buffer_size; |
1da177e4 | 1534 | } |
01a63aeb BP |
1535 | if (tape->merge_bh_size) { |
1536 | blocks = tape->merge_bh_size / tape->blk_size; | |
1537 | if (tape->merge_bh_size % tape->blk_size) { | |
1da177e4 LT |
1538 | unsigned int i; |
1539 | ||
1540 | blocks++; | |
01a63aeb | 1541 | i = tape->blk_size - tape->merge_bh_size % |
54bb2074 | 1542 | tape->blk_size; |
1da177e4 LT |
1543 | bh = tape->bh->b_reqnext; |
1544 | while (bh) { | |
1545 | atomic_set(&bh->b_count, 0); | |
1546 | bh = bh->b_reqnext; | |
1547 | } | |
1548 | bh = tape->bh; | |
1549 | while (i) { | |
1550 | if (bh == NULL) { | |
5a04cfa9 BP |
1551 | printk(KERN_INFO "ide-tape: bug," |
1552 | " bh NULL\n"); | |
1da177e4 LT |
1553 | break; |
1554 | } | |
5a04cfa9 BP |
1555 | min = min(i, (unsigned int)(bh->b_size - |
1556 | atomic_read(&bh->b_count))); | |
1557 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1558 | 0, min); | |
1da177e4 LT |
1559 | atomic_add(min, &bh->b_count); |
1560 | i -= min; | |
1561 | bh = bh->b_reqnext; | |
1562 | } | |
1563 | } | |
1564 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
01a63aeb | 1565 | tape->merge_bh_size = 0; |
1da177e4 | 1566 | } |
077e3bdb BP |
1567 | if (tape->merge_bh != NULL) { |
1568 | ide_tape_kfree_buffer(tape); | |
1569 | tape->merge_bh = NULL; | |
1da177e4 | 1570 | } |
54abf37e | 1571 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1572 | } |
1573 | ||
83042b24 | 1574 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
1575 | { |
1576 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1577 | int bytes_read; |
1da177e4 LT |
1578 | |
1579 | /* Initialize read operation */ | |
54abf37e BP |
1580 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1581 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
d9df937a | 1582 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1583 | idetape_flush_tape_buffers(drive); |
1584 | } | |
077e3bdb | 1585 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1586 | printk(KERN_ERR "ide-tape: merge_bh_size should be" |
5a04cfa9 | 1587 | " 0 now\n"); |
01a63aeb | 1588 | tape->merge_bh_size = 0; |
1da177e4 | 1589 | } |
077e3bdb BP |
1590 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1591 | if (!tape->merge_bh) | |
1da177e4 | 1592 | return -ENOMEM; |
54abf37e | 1593 | tape->chrdev_dir = IDETAPE_DIR_READ; |
1da177e4 LT |
1594 | |
1595 | /* | |
3c98bf34 BP |
1596 | * Issue a read 0 command to ensure that DSC handshake is |
1597 | * switched from completion mode to buffer available mode. | |
1598 | * No point in issuing this if DSC overlap isn't supported, some | |
1599 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1600 | */ |
1601 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1602 | bytes_read = idetape_queue_rw_tail(drive, |
1603 | REQ_IDETAPE_READ, 0, | |
077e3bdb | 1604 | tape->merge_bh); |
1da177e4 | 1605 | if (bytes_read < 0) { |
077e3bdb BP |
1606 | ide_tape_kfree_buffer(tape); |
1607 | tape->merge_bh = NULL; | |
54abf37e | 1608 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1609 | return bytes_read; |
1610 | } | |
1611 | } | |
1612 | } | |
5e69bd95 | 1613 | |
1da177e4 LT |
1614 | return 0; |
1615 | } | |
1616 | ||
5bd50dc6 | 1617 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1618 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1619 | { |
1620 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1621 | |
8004a8c9 | 1622 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1623 | |
3c98bf34 | 1624 | /* If we are at a filemark, return a read length of 0 */ |
f2e3ab52 | 1625 | if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 LT |
1626 | return 0; |
1627 | ||
83042b24 | 1628 | idetape_init_read(drive); |
5e69bd95 | 1629 | |
5e69bd95 | 1630 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
077e3bdb | 1631 | tape->merge_bh); |
1da177e4 LT |
1632 | } |
1633 | ||
5a04cfa9 | 1634 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1635 | { |
1636 | idetape_tape_t *tape = drive->driver_data; | |
1637 | struct idetape_bh *bh; | |
1638 | int blocks; | |
3c98bf34 | 1639 | |
1da177e4 LT |
1640 | while (bcount) { |
1641 | unsigned int count; | |
1642 | ||
077e3bdb | 1643 | bh = tape->merge_bh; |
f73850a3 | 1644 | count = min(tape->buffer_size, bcount); |
1da177e4 | 1645 | bcount -= count; |
54bb2074 | 1646 | blocks = count / tape->blk_size; |
1da177e4 | 1647 | while (count) { |
5a04cfa9 BP |
1648 | atomic_set(&bh->b_count, |
1649 | min(count, (unsigned int)bh->b_size)); | |
1da177e4 LT |
1650 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
1651 | count -= atomic_read(&bh->b_count); | |
1652 | bh = bh->b_reqnext; | |
1653 | } | |
5a04cfa9 | 1654 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
077e3bdb | 1655 | tape->merge_bh); |
1da177e4 LT |
1656 | } |
1657 | } | |
1658 | ||
1da177e4 | 1659 | /* |
3c98bf34 BP |
1660 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1661 | * currently support only one partition. | |
1662 | */ | |
5a04cfa9 | 1663 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 LT |
1664 | { |
1665 | int retval; | |
d236d74c | 1666 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1667 | idetape_tape_t *tape; |
1668 | tape = drive->driver_data; | |
1669 | ||
1670 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1671 | ||
1da177e4 LT |
1672 | idetape_create_rewind_cmd(drive, &pc); |
1673 | retval = idetape_queue_pc_tail(drive, &pc); | |
1674 | if (retval) | |
1675 | return retval; | |
1676 | ||
1677 | idetape_create_read_position_cmd(&pc); | |
1678 | retval = idetape_queue_pc_tail(drive, &pc); | |
1679 | if (retval) | |
1680 | return retval; | |
1681 | return 0; | |
1682 | } | |
1683 | ||
3c98bf34 | 1684 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1685 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1686 | unsigned long arg) | |
1da177e4 LT |
1687 | { |
1688 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1689 | void __user *argp = (void __user *)arg; |
1690 | ||
d59823fa BP |
1691 | struct idetape_config { |
1692 | int dsc_rw_frequency; | |
1693 | int dsc_media_access_frequency; | |
1694 | int nr_stages; | |
1695 | } config; | |
1696 | ||
8004a8c9 BP |
1697 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1698 | ||
1da177e4 | 1699 | switch (cmd) { |
5a04cfa9 BP |
1700 | case 0x0340: |
1701 | if (copy_from_user(&config, argp, sizeof(config))) | |
1702 | return -EFAULT; | |
1703 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1704 | break; |
1705 | case 0x0350: | |
1706 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1707 | config.nr_stages = 1; |
5a04cfa9 BP |
1708 | if (copy_to_user(argp, &config, sizeof(config))) |
1709 | return -EFAULT; | |
1710 | break; | |
1711 | default: | |
1712 | return -EIO; | |
1da177e4 LT |
1713 | } |
1714 | return 0; | |
1715 | } | |
1716 | ||
5a04cfa9 BP |
1717 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1718 | int mt_count) | |
1da177e4 LT |
1719 | { |
1720 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1721 | struct ide_atapi_pc pc; |
5a04cfa9 | 1722 | int retval, count = 0; |
b6422013 | 1723 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1724 | |
1725 | if (mt_count == 0) | |
1726 | return 0; | |
1727 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1728 | if (!sprev) |
1da177e4 | 1729 | return -EIO; |
5a04cfa9 | 1730 | mt_count = -mt_count; |
1da177e4 LT |
1731 | } |
1732 | ||
54abf37e | 1733 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
01a63aeb | 1734 | tape->merge_bh_size = 0; |
f2e3ab52 | 1735 | if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) |
1da177e4 | 1736 | ++count; |
ec0fdb01 | 1737 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1738 | } |
1739 | ||
1da177e4 | 1740 | switch (mt_op) { |
5a04cfa9 BP |
1741 | case MTFSF: |
1742 | case MTBSF: | |
1743 | idetape_create_space_cmd(&pc, mt_count - count, | |
1744 | IDETAPE_SPACE_OVER_FILEMARK); | |
1745 | return idetape_queue_pc_tail(drive, &pc); | |
1746 | case MTFSFM: | |
1747 | case MTBSFM: | |
1748 | if (!sprev) | |
1749 | return -EIO; | |
1750 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1751 | mt_count - count); | |
1752 | if (retval) | |
1753 | return retval; | |
1754 | count = (MTBSFM == mt_op ? 1 : -1); | |
1755 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1756 | default: | |
1757 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1758 | mt_op); | |
1759 | return -EIO; | |
1da177e4 LT |
1760 | } |
1761 | } | |
1762 | ||
1da177e4 | 1763 | /* |
3c98bf34 | 1764 | * Our character device read / write functions. |
1da177e4 | 1765 | * |
3c98bf34 BP |
1766 | * The tape is optimized to maximize throughput when it is transferring an |
1767 | * integral number of the "continuous transfer limit", which is a parameter of | |
1768 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1769 | * |
3c98bf34 BP |
1770 | * As of version 1.3 of the driver, the character device provides an abstract |
1771 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1772 | * same backup/restore procedure is supported. The driver will internally | |
1773 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1774 | * between the user's block size to the recommended size will only result in a | |
1775 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1776 | * This is not applicable to Onstream. | |
1da177e4 | 1777 | */ |
5a04cfa9 BP |
1778 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1779 | size_t count, loff_t *ppos) | |
1da177e4 LT |
1780 | { |
1781 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1782 | ide_drive_t *drive = tape->drive; | |
5a04cfa9 | 1783 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 1784 | ssize_t ret = 0; |
b6422013 | 1785 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 1786 | |
8004a8c9 | 1787 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1788 | |
54abf37e | 1789 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
f2e3ab52 | 1790 | if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) |
54bb2074 BP |
1791 | if (count > tape->blk_size && |
1792 | (count % tape->blk_size) == 0) | |
1793 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1794 | } |
83042b24 | 1795 | rc = idetape_init_read(drive); |
8d06bfad | 1796 | if (rc < 0) |
1da177e4 LT |
1797 | return rc; |
1798 | if (count == 0) | |
1799 | return (0); | |
01a63aeb BP |
1800 | if (tape->merge_bh_size) { |
1801 | actually_read = min((unsigned int)(tape->merge_bh_size), | |
5a04cfa9 | 1802 | (unsigned int)count); |
99d74e61 | 1803 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
dcd96379 | 1804 | ret = -EFAULT; |
1da177e4 | 1805 | buf += actually_read; |
01a63aeb | 1806 | tape->merge_bh_size -= actually_read; |
1da177e4 LT |
1807 | count -= actually_read; |
1808 | } | |
f73850a3 | 1809 | while (count >= tape->buffer_size) { |
b6422013 | 1810 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1811 | if (bytes_read <= 0) |
1812 | goto finish; | |
99d74e61 | 1813 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
dcd96379 | 1814 | ret = -EFAULT; |
1da177e4 LT |
1815 | buf += bytes_read; |
1816 | count -= bytes_read; | |
1817 | actually_read += bytes_read; | |
1818 | } | |
1819 | if (count) { | |
b6422013 | 1820 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1821 | if (bytes_read <= 0) |
1822 | goto finish; | |
1823 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
99d74e61 | 1824 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
dcd96379 | 1825 | ret = -EFAULT; |
1da177e4 | 1826 | actually_read += temp; |
01a63aeb | 1827 | tape->merge_bh_size = bytes_read-temp; |
1da177e4 LT |
1828 | } |
1829 | finish: | |
f2e3ab52 | 1830 | if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { |
8004a8c9 BP |
1831 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1832 | ||
1da177e4 LT |
1833 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1834 | return 0; | |
1835 | } | |
dcd96379 | 1836 | |
5a04cfa9 | 1837 | return ret ? ret : actually_read; |
1da177e4 LT |
1838 | } |
1839 | ||
5a04cfa9 | 1840 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1841 | size_t count, loff_t *ppos) |
1842 | { | |
1843 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1844 | ide_drive_t *drive = tape->drive; | |
dcd96379 DW |
1845 | ssize_t actually_written = 0; |
1846 | ssize_t ret = 0; | |
b6422013 | 1847 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
1848 | |
1849 | /* The drive is write protected. */ | |
1850 | if (tape->write_prot) | |
1851 | return -EACCES; | |
1852 | ||
8004a8c9 | 1853 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1854 | |
1855 | /* Initialize write operation */ | |
54abf37e BP |
1856 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
1857 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1858 | ide_tape_discard_merge_buffer(drive, 1); |
077e3bdb | 1859 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1860 | printk(KERN_ERR "ide-tape: merge_bh_size " |
1da177e4 | 1861 | "should be 0 now\n"); |
01a63aeb | 1862 | tape->merge_bh_size = 0; |
1da177e4 | 1863 | } |
077e3bdb BP |
1864 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1865 | if (!tape->merge_bh) | |
1da177e4 | 1866 | return -ENOMEM; |
54abf37e | 1867 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
077e3bdb | 1868 | idetape_init_merge_buffer(tape); |
1da177e4 LT |
1869 | |
1870 | /* | |
3c98bf34 BP |
1871 | * Issue a write 0 command to ensure that DSC handshake is |
1872 | * switched from completion mode to buffer available mode. No | |
1873 | * point in issuing this if DSC overlap isn't supported, some | |
1874 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1875 | */ |
1876 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1877 | ssize_t retval = idetape_queue_rw_tail(drive, |
1878 | REQ_IDETAPE_WRITE, 0, | |
077e3bdb | 1879 | tape->merge_bh); |
1da177e4 | 1880 | if (retval < 0) { |
077e3bdb BP |
1881 | ide_tape_kfree_buffer(tape); |
1882 | tape->merge_bh = NULL; | |
54abf37e | 1883 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1884 | return retval; |
1885 | } | |
1886 | } | |
1887 | } | |
1888 | if (count == 0) | |
1889 | return (0); | |
01a63aeb BP |
1890 | if (tape->merge_bh_size) { |
1891 | if (tape->merge_bh_size >= tape->buffer_size) { | |
5a04cfa9 | 1892 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
01a63aeb | 1893 | tape->merge_bh_size = 0; |
1da177e4 | 1894 | } |
5a04cfa9 | 1895 | actually_written = min((unsigned int) |
01a63aeb | 1896 | (tape->buffer_size - tape->merge_bh_size), |
5a04cfa9 | 1897 | (unsigned int)count); |
8646c88f | 1898 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
dcd96379 | 1899 | ret = -EFAULT; |
1da177e4 | 1900 | buf += actually_written; |
01a63aeb | 1901 | tape->merge_bh_size += actually_written; |
1da177e4 LT |
1902 | count -= actually_written; |
1903 | ||
01a63aeb | 1904 | if (tape->merge_bh_size == tape->buffer_size) { |
dcd96379 | 1905 | ssize_t retval; |
01a63aeb | 1906 | tape->merge_bh_size = 0; |
b6422013 | 1907 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
1908 | if (retval <= 0) |
1909 | return (retval); | |
1910 | } | |
1911 | } | |
f73850a3 | 1912 | while (count >= tape->buffer_size) { |
dcd96379 | 1913 | ssize_t retval; |
f73850a3 | 1914 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
dcd96379 | 1915 | ret = -EFAULT; |
f73850a3 BP |
1916 | buf += tape->buffer_size; |
1917 | count -= tape->buffer_size; | |
b6422013 | 1918 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 1919 | actually_written += tape->buffer_size; |
1da177e4 LT |
1920 | if (retval <= 0) |
1921 | return (retval); | |
1922 | } | |
1923 | if (count) { | |
1924 | actually_written += count; | |
8646c88f | 1925 | if (idetape_copy_stage_from_user(tape, buf, count)) |
dcd96379 | 1926 | ret = -EFAULT; |
01a63aeb | 1927 | tape->merge_bh_size += count; |
1da177e4 | 1928 | } |
5a04cfa9 | 1929 | return ret ? ret : actually_written; |
1da177e4 LT |
1930 | } |
1931 | ||
5a04cfa9 | 1932 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 1933 | { |
d236d74c | 1934 | struct ide_atapi_pc pc; |
1da177e4 LT |
1935 | |
1936 | /* Write a filemark */ | |
1937 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
1938 | if (idetape_queue_pc_tail(drive, &pc)) { | |
1939 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); | |
1940 | return -EIO; | |
1941 | } | |
1942 | return 0; | |
1943 | } | |
1944 | ||
1945 | /* | |
d99c9da2 BP |
1946 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1947 | * requested. | |
1da177e4 | 1948 | * |
d99c9da2 BP |
1949 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1950 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 1951 | * usually not supported. |
1da177e4 | 1952 | * |
d99c9da2 | 1953 | * The following commands are currently not supported: |
1da177e4 | 1954 | * |
d99c9da2 BP |
1955 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1956 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 1957 | */ |
d99c9da2 | 1958 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
1959 | { |
1960 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1961 | struct ide_atapi_pc pc; |
5a04cfa9 | 1962 | int i, retval; |
1da177e4 | 1963 | |
8004a8c9 BP |
1964 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
1965 | mt_op, mt_count); | |
5a04cfa9 | 1966 | |
1da177e4 | 1967 | switch (mt_op) { |
5a04cfa9 BP |
1968 | case MTFSF: |
1969 | case MTFSFM: | |
1970 | case MTBSF: | |
1971 | case MTBSFM: | |
1972 | if (!mt_count) | |
1973 | return 0; | |
1974 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1975 | default: | |
1976 | break; | |
1da177e4 | 1977 | } |
5a04cfa9 | 1978 | |
1da177e4 | 1979 | switch (mt_op) { |
5a04cfa9 BP |
1980 | case MTWEOF: |
1981 | if (tape->write_prot) | |
1982 | return -EACCES; | |
ec0fdb01 | 1983 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
1984 | for (i = 0; i < mt_count; i++) { |
1985 | retval = idetape_write_filemark(drive); | |
1986 | if (retval) | |
1987 | return retval; | |
1988 | } | |
1989 | return 0; | |
1990 | case MTREW: | |
ec0fdb01 | 1991 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1992 | if (idetape_rewind_tape(drive)) |
1993 | return -EIO; | |
1994 | return 0; | |
1995 | case MTLOAD: | |
ec0fdb01 | 1996 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
1997 | idetape_create_load_unload_cmd(drive, &pc, |
1998 | IDETAPE_LU_LOAD_MASK); | |
1999 | return idetape_queue_pc_tail(drive, &pc); | |
2000 | case MTUNLOAD: | |
2001 | case MTOFFL: | |
2002 | /* | |
2003 | * If door is locked, attempt to unlock before | |
2004 | * attempting to eject. | |
2005 | */ | |
2006 | if (tape->door_locked) { | |
2007 | if (idetape_create_prevent_cmd(drive, &pc, 0)) | |
2008 | if (!idetape_queue_pc_tail(drive, &pc)) | |
2009 | tape->door_locked = DOOR_UNLOCKED; | |
2010 | } | |
ec0fdb01 | 2011 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2012 | idetape_create_load_unload_cmd(drive, &pc, |
2013 | !IDETAPE_LU_LOAD_MASK); | |
2014 | retval = idetape_queue_pc_tail(drive, &pc); | |
2015 | if (!retval) | |
f2e3ab52 | 2016 | clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); |
5a04cfa9 BP |
2017 | return retval; |
2018 | case MTNOP: | |
ec0fdb01 | 2019 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2020 | return idetape_flush_tape_buffers(drive); |
2021 | case MTRETEN: | |
ec0fdb01 | 2022 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2023 | idetape_create_load_unload_cmd(drive, &pc, |
2024 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); | |
2025 | return idetape_queue_pc_tail(drive, &pc); | |
2026 | case MTEOM: | |
2027 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
2028 | return idetape_queue_pc_tail(drive, &pc); | |
2029 | case MTERASE: | |
2030 | (void)idetape_rewind_tape(drive); | |
2031 | idetape_create_erase_cmd(&pc); | |
2032 | return idetape_queue_pc_tail(drive, &pc); | |
2033 | case MTSETBLK: | |
2034 | if (mt_count) { | |
2035 | if (mt_count < tape->blk_size || | |
2036 | mt_count % tape->blk_size) | |
1da177e4 | 2037 | return -EIO; |
5a04cfa9 | 2038 | tape->user_bs_factor = mt_count / tape->blk_size; |
f2e3ab52 | 2039 | clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 | 2040 | } else |
f2e3ab52 | 2041 | set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); |
5a04cfa9 BP |
2042 | return 0; |
2043 | case MTSEEK: | |
ec0fdb01 | 2044 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2045 | return idetape_position_tape(drive, |
2046 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
2047 | case MTSETPART: | |
ec0fdb01 | 2048 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2049 | return idetape_position_tape(drive, 0, mt_count, 0); |
2050 | case MTFSR: | |
2051 | case MTBSR: | |
2052 | case MTLOCK: | |
2053 | if (!idetape_create_prevent_cmd(drive, &pc, 1)) | |
1da177e4 | 2054 | return 0; |
5a04cfa9 BP |
2055 | retval = idetape_queue_pc_tail(drive, &pc); |
2056 | if (retval) | |
1da177e4 | 2057 | return retval; |
5a04cfa9 BP |
2058 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
2059 | return 0; | |
2060 | case MTUNLOCK: | |
2061 | if (!idetape_create_prevent_cmd(drive, &pc, 0)) | |
1da177e4 | 2062 | return 0; |
5a04cfa9 BP |
2063 | retval = idetape_queue_pc_tail(drive, &pc); |
2064 | if (retval) | |
2065 | return retval; | |
2066 | tape->door_locked = DOOR_UNLOCKED; | |
2067 | return 0; | |
2068 | default: | |
2069 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
2070 | mt_op); | |
2071 | return -EIO; | |
1da177e4 LT |
2072 | } |
2073 | } | |
2074 | ||
2075 | /* | |
d99c9da2 BP |
2076 | * Our character device ioctls. General mtio.h magnetic io commands are |
2077 | * supported here, and not in the corresponding block interface. Our own | |
2078 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 2079 | */ |
d99c9da2 BP |
2080 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
2081 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
2082 | { |
2083 | struct ide_tape_obj *tape = ide_tape_f(file); | |
2084 | ide_drive_t *drive = tape->drive; | |
2085 | struct mtop mtop; | |
2086 | struct mtget mtget; | |
2087 | struct mtpos mtpos; | |
54bb2074 | 2088 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
2089 | void __user *argp = (void __user *)arg; |
2090 | ||
8004a8c9 | 2091 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 2092 | |
54abf37e | 2093 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 2094 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
2095 | idetape_flush_tape_buffers(drive); |
2096 | } | |
2097 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
01a63aeb | 2098 | block_offset = tape->merge_bh_size / |
54bb2074 | 2099 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
2100 | position = idetape_read_position(drive); |
2101 | if (position < 0) | |
1da177e4 LT |
2102 | return -EIO; |
2103 | } | |
2104 | switch (cmd) { | |
5a04cfa9 BP |
2105 | case MTIOCTOP: |
2106 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
2107 | return -EFAULT; | |
2108 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
2109 | case MTIOCGET: | |
2110 | memset(&mtget, 0, sizeof(struct mtget)); | |
2111 | mtget.mt_type = MT_ISSCSI2; | |
2112 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2113 | mtget.mt_dsreg = | |
2114 | ((tape->blk_size * tape->user_bs_factor) | |
2115 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
2116 | ||
2117 | if (tape->drv_write_prot) | |
2118 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
2119 | ||
2120 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
2121 | return -EFAULT; | |
2122 | return 0; | |
2123 | case MTIOCPOS: | |
2124 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2125 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
2126 | return -EFAULT; | |
2127 | return 0; | |
2128 | default: | |
2129 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 2130 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 2131 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
2132 | } |
2133 | } | |
2134 | ||
3cffb9ce BP |
2135 | /* |
2136 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
2137 | * block size with the reported value. | |
2138 | */ | |
2139 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
2140 | { | |
2141 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2142 | struct ide_atapi_pc pc; |
3cffb9ce BP |
2143 | |
2144 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2145 | if (idetape_queue_pc_tail(drive, &pc)) { | |
2146 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); | |
54bb2074 | 2147 | if (tape->blk_size == 0) { |
3cffb9ce BP |
2148 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
2149 | "block size, assuming 32k\n"); | |
54bb2074 | 2150 | tape->blk_size = 32768; |
3cffb9ce BP |
2151 | } |
2152 | return; | |
2153 | } | |
d236d74c BP |
2154 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
2155 | (pc.buf[4 + 6] << 8) + | |
2156 | pc.buf[4 + 7]; | |
2157 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 2158 | } |
1da177e4 | 2159 | |
5a04cfa9 | 2160 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
2161 | { |
2162 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
2163 | ide_drive_t *drive; | |
2164 | idetape_tape_t *tape; | |
d236d74c | 2165 | struct ide_atapi_pc pc; |
1da177e4 LT |
2166 | int retval; |
2167 | ||
8004a8c9 BP |
2168 | if (i >= MAX_HWIFS * MAX_DRIVES) |
2169 | return -ENXIO; | |
2170 | ||
04f4ac9d | 2171 | lock_kernel(); |
8004a8c9 | 2172 | tape = ide_tape_chrdev_get(i); |
04f4ac9d JC |
2173 | if (!tape) { |
2174 | unlock_kernel(); | |
8004a8c9 | 2175 | return -ENXIO; |
04f4ac9d | 2176 | } |
8004a8c9 BP |
2177 | |
2178 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
2179 | ||
1da177e4 LT |
2180 | /* |
2181 | * We really want to do nonseekable_open(inode, filp); here, but some | |
2182 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
2183 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
2184 | */ | |
2185 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
2186 | ||
1da177e4 LT |
2187 | drive = tape->drive; |
2188 | ||
2189 | filp->private_data = tape; | |
2190 | ||
f2e3ab52 | 2191 | if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { |
1da177e4 LT |
2192 | retval = -EBUSY; |
2193 | goto out_put_tape; | |
2194 | } | |
2195 | ||
2196 | retval = idetape_wait_ready(drive, 60 * HZ); | |
2197 | if (retval) { | |
f2e3ab52 | 2198 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2199 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
2200 | goto out_put_tape; | |
2201 | } | |
2202 | ||
2203 | idetape_read_position(drive); | |
f2e3ab52 | 2204 | if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) |
1da177e4 LT |
2205 | (void)idetape_rewind_tape(drive); |
2206 | ||
1da177e4 | 2207 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 2208 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
2209 | |
2210 | /* Set write protect flag if device is opened as read-only. */ | |
2211 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
2212 | tape->write_prot = 1; | |
2213 | else | |
2214 | tape->write_prot = tape->drv_write_prot; | |
2215 | ||
2216 | /* Make sure drive isn't write protected if user wants to write. */ | |
2217 | if (tape->write_prot) { | |
2218 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
2219 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
f2e3ab52 | 2220 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2221 | retval = -EROFS; |
2222 | goto out_put_tape; | |
2223 | } | |
2224 | } | |
2225 | ||
3c98bf34 | 2226 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 2227 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 LT |
2228 | if (idetape_create_prevent_cmd(drive, &pc, 1)) { |
2229 | if (!idetape_queue_pc_tail(drive, &pc)) { | |
2230 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) | |
2231 | tape->door_locked = DOOR_LOCKED; | |
2232 | } | |
2233 | } | |
2234 | } | |
04f4ac9d | 2235 | unlock_kernel(); |
1da177e4 LT |
2236 | return 0; |
2237 | ||
2238 | out_put_tape: | |
2239 | ide_tape_put(tape); | |
04f4ac9d | 2240 | unlock_kernel(); |
1da177e4 LT |
2241 | return retval; |
2242 | } | |
2243 | ||
5a04cfa9 | 2244 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
2245 | { |
2246 | idetape_tape_t *tape = drive->driver_data; | |
2247 | ||
d9df937a | 2248 | ide_tape_flush_merge_buffer(drive); |
077e3bdb BP |
2249 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); |
2250 | if (tape->merge_bh != NULL) { | |
54bb2074 BP |
2251 | idetape_pad_zeros(drive, tape->blk_size * |
2252 | (tape->user_bs_factor - 1)); | |
077e3bdb BP |
2253 | ide_tape_kfree_buffer(tape); |
2254 | tape->merge_bh = NULL; | |
1da177e4 LT |
2255 | } |
2256 | idetape_write_filemark(drive); | |
2257 | idetape_flush_tape_buffers(drive); | |
2258 | idetape_flush_tape_buffers(drive); | |
2259 | } | |
2260 | ||
5a04cfa9 | 2261 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 LT |
2262 | { |
2263 | struct ide_tape_obj *tape = ide_tape_f(filp); | |
2264 | ide_drive_t *drive = tape->drive; | |
d236d74c | 2265 | struct ide_atapi_pc pc; |
1da177e4 LT |
2266 | unsigned int minor = iminor(inode); |
2267 | ||
2268 | lock_kernel(); | |
2269 | tape = drive->driver_data; | |
8004a8c9 BP |
2270 | |
2271 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 2272 | |
54abf37e | 2273 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 2274 | idetape_write_release(drive, minor); |
54abf37e | 2275 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 2276 | if (minor < 128) |
ec0fdb01 | 2277 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 2278 | } |
f64eee7b | 2279 | |
f2e3ab52 | 2280 | if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) |
1da177e4 | 2281 | (void) idetape_rewind_tape(drive); |
54abf37e | 2282 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 LT |
2283 | if (tape->door_locked == DOOR_LOCKED) { |
2284 | if (idetape_create_prevent_cmd(drive, &pc, 0)) { | |
2285 | if (!idetape_queue_pc_tail(drive, &pc)) | |
2286 | tape->door_locked = DOOR_UNLOCKED; | |
2287 | } | |
2288 | } | |
2289 | } | |
f2e3ab52 | 2290 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); |
1da177e4 LT |
2291 | ide_tape_put(tape); |
2292 | unlock_kernel(); | |
2293 | return 0; | |
2294 | } | |
2295 | ||
6d29c8f0 | 2296 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 2297 | { |
1da177e4 | 2298 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 2299 | struct ide_atapi_pc pc; |
801bd32e | 2300 | char fw_rev[4], vendor_id[8], product_id[16]; |
6d29c8f0 | 2301 | |
1da177e4 LT |
2302 | idetape_create_inquiry_cmd(&pc); |
2303 | if (idetape_queue_pc_tail(drive, &pc)) { | |
6d29c8f0 BP |
2304 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
2305 | tape->name); | |
1da177e4 LT |
2306 | return; |
2307 | } | |
d236d74c BP |
2308 | memcpy(vendor_id, &pc.buf[8], 8); |
2309 | memcpy(product_id, &pc.buf[16], 16); | |
2310 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 | 2311 | |
801bd32e BP |
2312 | ide_fixstring(vendor_id, 8, 0); |
2313 | ide_fixstring(product_id, 16, 0); | |
2314 | ide_fixstring(fw_rev, 4, 0); | |
41f81d54 | 2315 | |
801bd32e | 2316 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
41f81d54 | 2317 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
2318 | } |
2319 | ||
2320 | /* | |
b6422013 BP |
2321 | * Ask the tape about its various parameters. In particular, we will adjust our |
2322 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 2323 | */ |
5a04cfa9 | 2324 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
2325 | { |
2326 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2327 | struct ide_atapi_pc pc; |
b6422013 BP |
2328 | u8 *caps; |
2329 | u8 speed, max_speed; | |
47314fa4 | 2330 | |
1da177e4 LT |
2331 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2332 | if (idetape_queue_pc_tail(drive, &pc)) { | |
b6422013 BP |
2333 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
2334 | " some default values\n"); | |
54bb2074 | 2335 | tape->blk_size = 512; |
b6422013 BP |
2336 | put_unaligned(52, (u16 *)&tape->caps[12]); |
2337 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2338 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
2339 | return; |
2340 | } | |
d236d74c | 2341 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
2342 | |
2343 | /* convert to host order and save for later use */ | |
cd740ab0 HH |
2344 | speed = be16_to_cpup((__be16 *)&caps[14]); |
2345 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
1da177e4 | 2346 | |
cd740ab0 HH |
2347 | *(u16 *)&caps[8] = max_speed; |
2348 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
2349 | *(u16 *)&caps[14] = speed; | |
2350 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
1da177e4 | 2351 | |
b6422013 BP |
2352 | if (!speed) { |
2353 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2354 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2355 | *(u16 *)&caps[14] = 650; |
1da177e4 | 2356 | } |
b6422013 BP |
2357 | if (!max_speed) { |
2358 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2359 | "(assuming 650KB/sec)\n", drive->name); | |
cd740ab0 | 2360 | *(u16 *)&caps[8] = 650; |
1da177e4 LT |
2361 | } |
2362 | ||
b6422013 BP |
2363 | memcpy(&tape->caps, caps, 20); |
2364 | if (caps[7] & 0x02) | |
54bb2074 | 2365 | tape->blk_size = 512; |
b6422013 | 2366 | else if (caps[7] & 0x04) |
54bb2074 | 2367 | tape->blk_size = 1024; |
1da177e4 LT |
2368 | } |
2369 | ||
7662d046 | 2370 | #ifdef CONFIG_IDE_PROC_FS |
8185d5aa BZ |
2371 | #define ide_tape_devset_get(name, field) \ |
2372 | static int get_##name(ide_drive_t *drive) \ | |
2373 | { \ | |
2374 | idetape_tape_t *tape = drive->driver_data; \ | |
2375 | return tape->field; \ | |
2376 | } | |
2377 | ||
2378 | #define ide_tape_devset_set(name, field) \ | |
2379 | static int set_##name(ide_drive_t *drive, int arg) \ | |
2380 | { \ | |
2381 | idetape_tape_t *tape = drive->driver_data; \ | |
2382 | tape->field = arg; \ | |
2383 | return 0; \ | |
2384 | } | |
2385 | ||
2386 | #define ide_tape_devset_rw(_name, _min, _max, _field, _mulf, _divf) \ | |
2387 | ide_tape_devset_get(_name, _field) \ | |
2388 | ide_tape_devset_set(_name, _field) \ | |
2389 | __IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name, _mulf, _divf) | |
2390 | ||
2391 | #define ide_tape_devset_r(_name, _min, _max, _field, _mulf, _divf) \ | |
2392 | ide_tape_devset_get(_name, _field) \ | |
2393 | __IDE_DEVSET(_name, S_READ, _min, _max, get_##_name, NULL, _mulf, _divf) | |
2394 | ||
2395 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
2396 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
2397 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
2398 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
2399 | ||
2400 | ide_devset_rw(dsc_overlap, 0, 1, dsc_overlap); | |
2401 | ||
2402 | ide_tape_devset_rw(debug_mask, 0, 0xffff, debug_mask, NULL, NULL); | |
2403 | ide_tape_devset_rw(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
2404 | best_dsc_rw_freq, mulf_tdsc, divf_tdsc); | |
2405 | ||
2406 | ide_tape_devset_r(avg_speed, 0, 0xffff, avg_speed, NULL, NULL); | |
2407 | ide_tape_devset_r(speed, 0, 0xffff, caps[14], NULL, NULL); | |
2408 | ide_tape_devset_r(buffer, 0, 0xffff, caps[16], NULL, divf_buffer); | |
2409 | ide_tape_devset_r(buffer_size, 0, 0xffff, buffer_size, NULL, divf_buffer_size); | |
2410 | ||
2411 | static const struct ide_devset *idetape_settings[] = { | |
2412 | &ide_devset_avg_speed, | |
2413 | &ide_devset_buffer, | |
2414 | &ide_devset_buffer_size, | |
2415 | &ide_devset_debug_mask, | |
2416 | &ide_devset_dsc_overlap, | |
2417 | &ide_devset_speed, | |
2418 | &ide_devset_tdsc, | |
2419 | NULL | |
2420 | }; | |
7662d046 | 2421 | #endif |
1da177e4 LT |
2422 | |
2423 | /* | |
3c98bf34 | 2424 | * The function below is called to: |
1da177e4 | 2425 | * |
3c98bf34 BP |
2426 | * 1. Initialize our various state variables. |
2427 | * 2. Ask the tape for its capabilities. | |
2428 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2429 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 2430 | * |
3c98bf34 BP |
2431 | * Note that at this point ide.c already assigned us an irq, so that we can |
2432 | * queue requests here and wait for their completion. | |
1da177e4 | 2433 | */ |
5a04cfa9 | 2434 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 2435 | { |
83042b24 | 2436 | unsigned long t; |
1da177e4 | 2437 | int speed; |
f73850a3 | 2438 | int buffer_size; |
71071b8e | 2439 | u8 gcw[2]; |
b6422013 | 2440 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 2441 | |
776bb027 BP |
2442 | drive->pc_callback = ide_tape_callback; |
2443 | ||
54bb2074 | 2444 | spin_lock_init(&tape->lock); |
1da177e4 | 2445 | drive->dsc_overlap = 1; |
4166c199 BZ |
2446 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
2447 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2448 | tape->name); | |
2449 | drive->dsc_overlap = 0; | |
1da177e4 | 2450 | } |
1da177e4 | 2451 | /* Seagate Travan drives do not support DSC overlap. */ |
4dde4492 | 2452 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
1da177e4 LT |
2453 | drive->dsc_overlap = 0; |
2454 | tape->minor = minor; | |
2455 | tape->name[0] = 'h'; | |
2456 | tape->name[1] = 't'; | |
2457 | tape->name[2] = '0' + minor; | |
54abf37e | 2458 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 | 2459 | tape->pc = tape->pc_stack; |
4dde4492 BZ |
2460 | |
2461 | *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG]; | |
71071b8e BP |
2462 | |
2463 | /* Command packet DRQ type */ | |
2464 | if (((gcw[0] & 0x60) >> 5) == 1) | |
f2e3ab52 | 2465 | set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags); |
1da177e4 | 2466 | |
1da177e4 LT |
2467 | idetape_get_inquiry_results(drive); |
2468 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 2469 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 2470 | tape->user_bs_factor = 1; |
f73850a3 BP |
2471 | tape->buffer_size = *ctl * tape->blk_size; |
2472 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 2473 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 2474 | *ctl /= 2; |
f73850a3 | 2475 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 2476 | } |
f73850a3 | 2477 | buffer_size = tape->buffer_size; |
a997a435 | 2478 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
f73850a3 | 2479 | if (buffer_size % PAGE_SIZE) { |
a997a435 | 2480 | tape->pages_per_buffer++; |
f73850a3 | 2481 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
1da177e4 LT |
2482 | } |
2483 | ||
83042b24 | 2484 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 2485 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 2486 | |
f73850a3 | 2487 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
2488 | |
2489 | /* | |
3c98bf34 BP |
2490 | * Ensure that the number we got makes sense; limit it within |
2491 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 2492 | */ |
a792bd5a HH |
2493 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
2494 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 2495 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 2496 | "%lums tDSC%s\n", |
b6422013 | 2497 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
2498 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
2499 | tape->buffer_size / 1024, | |
54bb2074 | 2500 | tape->best_dsc_rw_freq * 1000 / HZ, |
1da177e4 LT |
2501 | drive->using_dma ? ", DMA":""); |
2502 | ||
1e874f44 | 2503 | ide_proc_register_driver(drive, tape->driver); |
1da177e4 LT |
2504 | } |
2505 | ||
4031bbe4 | 2506 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
2507 | { |
2508 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 2509 | |
7662d046 | 2510 | ide_proc_unregister_driver(drive, tape->driver); |
1da177e4 LT |
2511 | |
2512 | ide_unregister_region(tape->disk); | |
2513 | ||
2514 | ide_tape_put(tape); | |
1da177e4 LT |
2515 | } |
2516 | ||
2517 | static void ide_tape_release(struct kref *kref) | |
2518 | { | |
2519 | struct ide_tape_obj *tape = to_ide_tape(kref); | |
2520 | ide_drive_t *drive = tape->drive; | |
2521 | struct gendisk *g = tape->disk; | |
2522 | ||
01a63aeb | 2523 | BUG_ON(tape->merge_bh_size); |
8604affd | 2524 | |
1da177e4 LT |
2525 | drive->dsc_overlap = 0; |
2526 | drive->driver_data = NULL; | |
dbc1272e | 2527 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
2528 | device_destroy(idetape_sysfs_class, |
2529 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
2530 | idetape_devs[tape->minor] = NULL; |
2531 | g->private_data = NULL; | |
2532 | put_disk(g); | |
2533 | kfree(tape); | |
2534 | } | |
2535 | ||
ecfd80e4 | 2536 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
2537 | static int proc_idetape_read_name |
2538 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2539 | { | |
2540 | ide_drive_t *drive = (ide_drive_t *) data; | |
2541 | idetape_tape_t *tape = drive->driver_data; | |
2542 | char *out = page; | |
2543 | int len; | |
2544 | ||
2545 | len = sprintf(out, "%s\n", tape->name); | |
2546 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2547 | } | |
2548 | ||
2549 | static ide_proc_entry_t idetape_proc[] = { | |
2550 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2551 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2552 | { NULL, 0, NULL, NULL } | |
2553 | }; | |
1da177e4 LT |
2554 | #endif |
2555 | ||
4031bbe4 | 2556 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 2557 | |
1da177e4 | 2558 | static ide_driver_t idetape_driver = { |
8604affd | 2559 | .gen_driver = { |
4ef3b8f4 | 2560 | .owner = THIS_MODULE, |
8604affd BZ |
2561 | .name = "ide-tape", |
2562 | .bus = &ide_bus_type, | |
8604affd | 2563 | }, |
4031bbe4 RK |
2564 | .probe = ide_tape_probe, |
2565 | .remove = ide_tape_remove, | |
1da177e4 LT |
2566 | .version = IDETAPE_VERSION, |
2567 | .media = ide_tape, | |
1da177e4 LT |
2568 | .do_request = idetape_do_request, |
2569 | .end_request = idetape_end_request, | |
2570 | .error = __ide_error, | |
7662d046 | 2571 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 | 2572 | .proc = idetape_proc, |
8185d5aa | 2573 | .settings = idetape_settings, |
7662d046 | 2574 | #endif |
1da177e4 LT |
2575 | }; |
2576 | ||
3c98bf34 | 2577 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 2578 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
2579 | .owner = THIS_MODULE, |
2580 | .read = idetape_chrdev_read, | |
2581 | .write = idetape_chrdev_write, | |
2582 | .ioctl = idetape_chrdev_ioctl, | |
2583 | .open = idetape_chrdev_open, | |
2584 | .release = idetape_chrdev_release, | |
2585 | }; | |
2586 | ||
2587 | static int idetape_open(struct inode *inode, struct file *filp) | |
2588 | { | |
2589 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2590 | struct ide_tape_obj *tape; | |
1da177e4 | 2591 | |
5a04cfa9 BP |
2592 | tape = ide_tape_get(disk); |
2593 | if (!tape) | |
1da177e4 LT |
2594 | return -ENXIO; |
2595 | ||
1da177e4 LT |
2596 | return 0; |
2597 | } | |
2598 | ||
2599 | static int idetape_release(struct inode *inode, struct file *filp) | |
2600 | { | |
2601 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2602 | struct ide_tape_obj *tape = ide_tape_g(disk); | |
1da177e4 LT |
2603 | |
2604 | ide_tape_put(tape); | |
2605 | ||
2606 | return 0; | |
2607 | } | |
2608 | ||
2609 | static int idetape_ioctl(struct inode *inode, struct file *file, | |
2610 | unsigned int cmd, unsigned long arg) | |
2611 | { | |
2612 | struct block_device *bdev = inode->i_bdev; | |
2613 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); | |
2614 | ide_drive_t *drive = tape->drive; | |
2615 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); | |
2616 | if (err == -EINVAL) | |
2617 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2618 | return err; | |
2619 | } | |
2620 | ||
2621 | static struct block_device_operations idetape_block_ops = { | |
2622 | .owner = THIS_MODULE, | |
2623 | .open = idetape_open, | |
2624 | .release = idetape_release, | |
2625 | .ioctl = idetape_ioctl, | |
2626 | }; | |
2627 | ||
4031bbe4 | 2628 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2629 | { |
2630 | idetape_tape_t *tape; | |
2631 | struct gendisk *g; | |
2632 | int minor; | |
2633 | ||
2634 | if (!strstr("ide-tape", drive->driver_req)) | |
2635 | goto failed; | |
2a924662 | 2636 | |
1da177e4 LT |
2637 | if (drive->media != ide_tape) |
2638 | goto failed; | |
2a924662 | 2639 | |
51509eec | 2640 | if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) { |
5a04cfa9 BP |
2641 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
2642 | " the driver\n", drive->name); | |
1da177e4 LT |
2643 | goto failed; |
2644 | } | |
5a04cfa9 | 2645 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2646 | if (tape == NULL) { |
5a04cfa9 BP |
2647 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2648 | drive->name); | |
1da177e4 LT |
2649 | goto failed; |
2650 | } | |
2651 | ||
2652 | g = alloc_disk(1 << PARTN_BITS); | |
2653 | if (!g) | |
2654 | goto out_free_tape; | |
2655 | ||
2656 | ide_init_disk(g, drive); | |
2657 | ||
1da177e4 LT |
2658 | kref_init(&tape->kref); |
2659 | ||
2660 | tape->drive = drive; | |
2661 | tape->driver = &idetape_driver; | |
2662 | tape->disk = g; | |
2663 | ||
2664 | g->private_data = &tape->driver; | |
2665 | ||
2666 | drive->driver_data = tape; | |
2667 | ||
cf8b8975 | 2668 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2669 | for (minor = 0; idetape_devs[minor]; minor++) |
2670 | ; | |
2671 | idetape_devs[minor] = tape; | |
cf8b8975 | 2672 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2673 | |
2674 | idetape_setup(drive, tape, minor); | |
2675 | ||
6ecaaf94 GKH |
2676 | device_create_drvdata(idetape_sysfs_class, &drive->gendev, |
2677 | MKDEV(IDETAPE_MAJOR, minor), NULL, | |
2678 | "%s", tape->name); | |
2679 | device_create_drvdata(idetape_sysfs_class, &drive->gendev, | |
2680 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
2681 | "n%s", tape->name); | |
d5dee80a | 2682 | |
1da177e4 LT |
2683 | g->fops = &idetape_block_ops; |
2684 | ide_register_region(g); | |
2685 | ||
2686 | return 0; | |
8604affd | 2687 | |
1da177e4 LT |
2688 | out_free_tape: |
2689 | kfree(tape); | |
2690 | failed: | |
8604affd | 2691 | return -ENODEV; |
1da177e4 LT |
2692 | } |
2693 | ||
5a04cfa9 | 2694 | static void __exit idetape_exit(void) |
1da177e4 | 2695 | { |
8604affd | 2696 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2697 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2698 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2699 | } | |
2700 | ||
17514e8a | 2701 | static int __init idetape_init(void) |
1da177e4 | 2702 | { |
d5dee80a WD |
2703 | int error = 1; |
2704 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2705 | if (IS_ERR(idetape_sysfs_class)) { | |
2706 | idetape_sysfs_class = NULL; | |
2707 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2708 | error = -EBUSY; | |
2709 | goto out; | |
2710 | } | |
2711 | ||
1da177e4 | 2712 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2713 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2714 | " interface\n"); | |
d5dee80a WD |
2715 | error = -EBUSY; |
2716 | goto out_free_class; | |
1da177e4 | 2717 | } |
d5dee80a WD |
2718 | |
2719 | error = driver_register(&idetape_driver.gen_driver); | |
2720 | if (error) | |
2721 | goto out_free_driver; | |
2722 | ||
2723 | return 0; | |
2724 | ||
2725 | out_free_driver: | |
2726 | driver_unregister(&idetape_driver.gen_driver); | |
2727 | out_free_class: | |
2728 | class_destroy(idetape_sysfs_class); | |
2729 | out: | |
2730 | return error; | |
1da177e4 LT |
2731 | } |
2732 | ||
263756ec | 2733 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2734 | module_init(idetape_init); |
2735 | module_exit(idetape_exit); | |
2736 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2737 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2738 | MODULE_LICENSE("GPL"); |