Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
5ce78af4 BP |
2 | * IDE ATAPI streaming tape driver. |
3 | * | |
59bca8cc BZ |
4 | * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> |
5 | * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz | |
1da177e4 | 6 | * |
1da177e4 LT |
7 | * This driver was constructed as a student project in the software laboratory |
8 | * of the faculty of electrical engineering in the Technion - Israel's | |
9 | * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. | |
10 | * | |
11 | * It is hereby placed under the terms of the GNU general public license. | |
12 | * (See linux/COPYING). | |
1da177e4 | 13 | * |
5ce78af4 BP |
14 | * For a historical changelog see |
15 | * Documentation/ide/ChangeLog.ide-tape.1995-2002 | |
1da177e4 LT |
16 | */ |
17 | ||
dfe79936 | 18 | #define IDETAPE_VERSION "1.20" |
1da177e4 | 19 | |
1da177e4 LT |
20 | #include <linux/module.h> |
21 | #include <linux/types.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/timer.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/interrupt.h> | |
9bae1ff3 | 28 | #include <linux/jiffies.h> |
1da177e4 | 29 | #include <linux/major.h> |
1da177e4 LT |
30 | #include <linux/errno.h> |
31 | #include <linux/genhd.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/pci.h> | |
34 | #include <linux/ide.h> | |
35 | #include <linux/smp_lock.h> | |
36 | #include <linux/completion.h> | |
37 | #include <linux/bitops.h> | |
cf8b8975 | 38 | #include <linux/mutex.h> |
90699ce2 | 39 | #include <scsi/scsi.h> |
1da177e4 LT |
40 | |
41 | #include <asm/byteorder.h> | |
c837cfa5 BP |
42 | #include <linux/irq.h> |
43 | #include <linux/uaccess.h> | |
44 | #include <linux/io.h> | |
1da177e4 | 45 | #include <asm/unaligned.h> |
1da177e4 LT |
46 | #include <linux/mtio.h> |
47 | ||
8004a8c9 BP |
48 | enum { |
49 | /* output errors only */ | |
50 | DBG_ERR = (1 << 0), | |
51 | /* output all sense key/asc */ | |
52 | DBG_SENSE = (1 << 1), | |
53 | /* info regarding all chrdev-related procedures */ | |
54 | DBG_CHRDEV = (1 << 2), | |
55 | /* all remaining procedures */ | |
56 | DBG_PROCS = (1 << 3), | |
57 | /* buffer alloc info (pc_stack & rq_stack) */ | |
58 | DBG_PCRQ_STACK = (1 << 4), | |
59 | }; | |
60 | ||
61 | /* define to see debug info */ | |
62 | #define IDETAPE_DEBUG_LOG 0 | |
63 | ||
64 | #if IDETAPE_DEBUG_LOG | |
65 | #define debug_log(lvl, fmt, args...) \ | |
66 | { \ | |
67 | if (tape->debug_mask & lvl) \ | |
68 | printk(KERN_INFO "ide-tape: " fmt, ## args); \ | |
69 | } | |
70 | #else | |
71 | #define debug_log(lvl, fmt, args...) do {} while (0) | |
72 | #endif | |
73 | ||
1da177e4 | 74 | /**************************** Tunable parameters *****************************/ |
1da177e4 | 75 | /* |
3c98bf34 BP |
76 | * After each failed packet command we issue a request sense command and retry |
77 | * the packet command IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 78 | * |
3c98bf34 | 79 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
1da177e4 LT |
80 | */ |
81 | #define IDETAPE_MAX_PC_RETRIES 3 | |
82 | ||
83 | /* | |
3c98bf34 BP |
84 | * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE |
85 | * bytes. This is used for several packet commands (Not for READ/WRITE commands) | |
1da177e4 LT |
86 | */ |
87 | #define IDETAPE_PC_BUFFER_SIZE 256 | |
88 | ||
89 | /* | |
90 | * In various places in the driver, we need to allocate storage | |
91 | * for packet commands and requests, which will remain valid while | |
92 | * we leave the driver to wait for an interrupt or a timeout event. | |
93 | */ | |
94 | #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) | |
95 | ||
96 | /* | |
97 | * Some drives (for example, Seagate STT3401A Travan) require a very long | |
98 | * timeout, because they don't return an interrupt or clear their busy bit | |
99 | * until after the command completes (even retension commands). | |
100 | */ | |
101 | #define IDETAPE_WAIT_CMD (900*HZ) | |
102 | ||
103 | /* | |
3c98bf34 BP |
104 | * The following parameter is used to select the point in the internal tape fifo |
105 | * in which we will start to refill the buffer. Decreasing the following | |
106 | * parameter will improve the system's latency and interactive response, while | |
107 | * using a high value might improve system throughput. | |
1da177e4 | 108 | */ |
3c98bf34 | 109 | #define IDETAPE_FIFO_THRESHOLD 2 |
1da177e4 LT |
110 | |
111 | /* | |
3c98bf34 | 112 | * DSC polling parameters. |
1da177e4 | 113 | * |
3c98bf34 BP |
114 | * Polling for DSC (a single bit in the status register) is a very important |
115 | * function in ide-tape. There are two cases in which we poll for DSC: | |
1da177e4 | 116 | * |
3c98bf34 BP |
117 | * 1. Before a read/write packet command, to ensure that we can transfer data |
118 | * from/to the tape's data buffers, without causing an actual media access. | |
119 | * In case the tape is not ready yet, we take out our request from the device | |
120 | * request queue, so that ide.c could service requests from the other device | |
121 | * on the same interface in the meantime. | |
1da177e4 | 122 | * |
3c98bf34 BP |
123 | * 2. After the successful initialization of a "media access packet command", |
124 | * which is a command that can take a long time to complete (the interval can | |
125 | * range from several seconds to even an hour). Again, we postpone our request | |
126 | * in the middle to free the bus for the other device. The polling frequency | |
127 | * here should be lower than the read/write frequency since those media access | |
128 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST | |
129 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD | |
130 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). | |
1da177e4 | 131 | * |
3c98bf34 BP |
132 | * We also set a timeout for the timer, in case something goes wrong. The |
133 | * timeout should be longer then the maximum execution time of a tape operation. | |
1da177e4 | 134 | */ |
3c98bf34 BP |
135 | |
136 | /* DSC timings. */ | |
1da177e4 LT |
137 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
138 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ | |
139 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ | |
140 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ | |
141 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ | |
142 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ | |
143 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ | |
144 | ||
145 | /*************************** End of tunable parameters ***********************/ | |
146 | ||
54abf37e BP |
147 | /* tape directions */ |
148 | enum { | |
149 | IDETAPE_DIR_NONE = (1 << 0), | |
150 | IDETAPE_DIR_READ = (1 << 1), | |
151 | IDETAPE_DIR_WRITE = (1 << 2), | |
152 | }; | |
1da177e4 LT |
153 | |
154 | struct idetape_bh { | |
ab057968 | 155 | u32 b_size; |
1da177e4 LT |
156 | atomic_t b_count; |
157 | struct idetape_bh *b_reqnext; | |
158 | char *b_data; | |
159 | }; | |
160 | ||
03056b90 BP |
161 | /* Tape door status */ |
162 | #define DOOR_UNLOCKED 0 | |
163 | #define DOOR_LOCKED 1 | |
164 | #define DOOR_EXPLICITLY_LOCKED 2 | |
165 | ||
166 | /* Some defines for the SPACE command */ | |
167 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
168 | #define IDETAPE_SPACE_TO_EOD 3 | |
169 | ||
170 | /* Some defines for the LOAD UNLOAD command */ | |
171 | #define IDETAPE_LU_LOAD_MASK 1 | |
172 | #define IDETAPE_LU_RETENSION_MASK 2 | |
173 | #define IDETAPE_LU_EOT_MASK 4 | |
174 | ||
175 | /* | |
176 | * Special requests for our block device strategy routine. | |
177 | * | |
178 | * In order to service a character device command, we add special requests to | |
179 | * the tail of our block device request queue and wait for their completion. | |
180 | */ | |
181 | ||
182 | enum { | |
183 | REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ | |
184 | REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ | |
185 | REQ_IDETAPE_READ = (1 << 2), | |
186 | REQ_IDETAPE_WRITE = (1 << 3), | |
187 | }; | |
188 | ||
189 | /* Error codes returned in rq->errors to the higher part of the driver. */ | |
190 | #define IDETAPE_ERROR_GENERAL 101 | |
191 | #define IDETAPE_ERROR_FILEMARK 102 | |
192 | #define IDETAPE_ERROR_EOD 103 | |
193 | ||
194 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ | |
195 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
196 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
197 | ||
346331f8 BP |
198 | /* Tape flag bits values. */ |
199 | enum { | |
200 | IDETAPE_FLAG_IGNORE_DSC = (1 << 0), | |
201 | /* 0 When the tape position is unknown */ | |
202 | IDETAPE_FLAG_ADDRESS_VALID = (1 << 1), | |
203 | /* Device already opened */ | |
42d54689 | 204 | IDETAPE_FLAG_BUSY = (1 << 2), |
346331f8 | 205 | /* Attempt to auto-detect the current user block size */ |
42d54689 | 206 | IDETAPE_FLAG_DETECT_BS = (1 << 3), |
346331f8 | 207 | /* Currently on a filemark */ |
42d54689 | 208 | IDETAPE_FLAG_FILEMARK = (1 << 4), |
346331f8 | 209 | /* DRQ interrupt device */ |
42d54689 | 210 | IDETAPE_FLAG_DRQ_INTERRUPT = (1 << 5), |
346331f8 | 211 | /* 0 = no tape is loaded, so we don't rewind after ejecting */ |
42d54689 | 212 | IDETAPE_FLAG_MEDIUM_PRESENT = (1 << 6), |
346331f8 BP |
213 | }; |
214 | ||
1da177e4 | 215 | /* |
3c98bf34 BP |
216 | * Most of our global data which we need to save even as we leave the driver due |
217 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
218 | */ |
219 | typedef struct ide_tape_obj { | |
220 | ide_drive_t *drive; | |
221 | ide_driver_t *driver; | |
222 | struct gendisk *disk; | |
223 | struct kref kref; | |
224 | ||
225 | /* | |
226 | * Since a typical character device operation requires more | |
227 | * than one packet command, we provide here enough memory | |
228 | * for the maximum of interconnected packet commands. | |
229 | * The packet commands are stored in the circular array pc_stack. | |
230 | * pc_stack_index points to the last used entry, and warps around | |
231 | * to the start when we get to the last array entry. | |
232 | * | |
233 | * pc points to the current processed packet command. | |
234 | * | |
235 | * failed_pc points to the last failed packet command, or contains | |
236 | * NULL if we do not need to retry any packet command. This is | |
237 | * required since an additional packet command is needed before the | |
238 | * retry, to get detailed information on what went wrong. | |
239 | */ | |
240 | /* Current packet command */ | |
d236d74c | 241 | struct ide_atapi_pc *pc; |
1da177e4 | 242 | /* Last failed packet command */ |
d236d74c | 243 | struct ide_atapi_pc *failed_pc; |
1da177e4 | 244 | /* Packet command stack */ |
d236d74c | 245 | struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK]; |
1da177e4 LT |
246 | /* Next free packet command storage space */ |
247 | int pc_stack_index; | |
248 | struct request rq_stack[IDETAPE_PC_STACK]; | |
249 | /* We implement a circular array */ | |
250 | int rq_stack_index; | |
251 | ||
252 | /* | |
3c98bf34 | 253 | * DSC polling variables. |
1da177e4 | 254 | * |
3c98bf34 BP |
255 | * While polling for DSC we use postponed_rq to postpone the current |
256 | * request so that ide.c will be able to service pending requests on the | |
257 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 258 | * data transfer) request in the device request queue. |
1da177e4 LT |
259 | */ |
260 | struct request *postponed_rq; | |
261 | /* The time in which we started polling for DSC */ | |
262 | unsigned long dsc_polling_start; | |
263 | /* Timer used to poll for dsc */ | |
264 | struct timer_list dsc_timer; | |
265 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
266 | unsigned long best_dsc_rw_freq; |
267 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
268 | unsigned long dsc_timeout; |
269 | ||
3c98bf34 | 270 | /* Read position information */ |
1da177e4 LT |
271 | u8 partition; |
272 | /* Current block */ | |
54bb2074 | 273 | unsigned int first_frame; |
1da177e4 | 274 | |
3c98bf34 | 275 | /* Last error information */ |
1da177e4 LT |
276 | u8 sense_key, asc, ascq; |
277 | ||
3c98bf34 | 278 | /* Character device operation */ |
1da177e4 LT |
279 | unsigned int minor; |
280 | /* device name */ | |
281 | char name[4]; | |
282 | /* Current character device data transfer direction */ | |
54abf37e | 283 | u8 chrdev_dir; |
1da177e4 | 284 | |
54bb2074 BP |
285 | /* tape block size, usually 512 or 1024 bytes */ |
286 | unsigned short blk_size; | |
1da177e4 | 287 | int user_bs_factor; |
b6422013 | 288 | |
1da177e4 | 289 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 290 | u8 caps[20]; |
1da177e4 LT |
291 | |
292 | /* | |
3c98bf34 | 293 | * Active data transfer request parameters. |
1da177e4 | 294 | * |
3c98bf34 BP |
295 | * At most, there is only one ide-tape originated data transfer request |
296 | * in the device request queue. This allows ide.c to easily service | |
297 | * requests from the other device when we postpone our active request. | |
1da177e4 | 298 | */ |
83042b24 | 299 | |
3c98bf34 | 300 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 301 | int buffer_size; |
077e3bdb BP |
302 | /* merge buffer */ |
303 | struct idetape_bh *merge_bh; | |
01a63aeb BP |
304 | /* size of the merge buffer */ |
305 | int merge_bh_size; | |
077e3bdb | 306 | /* pointer to current buffer head within the merge buffer */ |
1da177e4 LT |
307 | struct idetape_bh *bh; |
308 | char *b_data; | |
309 | int b_count; | |
3c98bf34 | 310 | |
a997a435 | 311 | int pages_per_buffer; |
1da177e4 LT |
312 | /* Wasted space in each stage */ |
313 | int excess_bh_size; | |
314 | ||
315 | /* Status/Action flags: long for set_bit */ | |
316 | unsigned long flags; | |
317 | /* protects the ide-tape queue */ | |
54bb2074 | 318 | spinlock_t lock; |
1da177e4 | 319 | |
3c98bf34 | 320 | /* Measures average tape speed */ |
1da177e4 LT |
321 | unsigned long avg_time; |
322 | int avg_size; | |
323 | int avg_speed; | |
324 | ||
1da177e4 LT |
325 | /* the door is currently locked */ |
326 | int door_locked; | |
327 | /* the tape hardware is write protected */ | |
328 | char drv_write_prot; | |
329 | /* the tape is write protected (hardware or opened as read-only) */ | |
330 | char write_prot; | |
331 | ||
8004a8c9 | 332 | u32 debug_mask; |
1da177e4 LT |
333 | } idetape_tape_t; |
334 | ||
cf8b8975 | 335 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 336 | |
d5dee80a WD |
337 | static struct class *idetape_sysfs_class; |
338 | ||
1da177e4 LT |
339 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
340 | ||
341 | #define ide_tape_g(disk) \ | |
342 | container_of((disk)->private_data, struct ide_tape_obj, driver) | |
343 | ||
344 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) | |
345 | { | |
346 | struct ide_tape_obj *tape = NULL; | |
347 | ||
cf8b8975 | 348 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
349 | tape = ide_tape_g(disk); |
350 | if (tape) | |
351 | kref_get(&tape->kref); | |
cf8b8975 | 352 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
353 | return tape; |
354 | } | |
355 | ||
356 | static void ide_tape_release(struct kref *); | |
357 | ||
358 | static void ide_tape_put(struct ide_tape_obj *tape) | |
359 | { | |
cf8b8975 | 360 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 361 | kref_put(&tape->kref, ide_tape_release); |
cf8b8975 | 362 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
363 | } |
364 | ||
1da177e4 | 365 | /* |
3c98bf34 BP |
366 | * The variables below are used for the character device interface. Additional |
367 | * state variables are defined in our ide_drive_t structure. | |
1da177e4 | 368 | */ |
5a04cfa9 | 369 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
1da177e4 LT |
370 | |
371 | #define ide_tape_f(file) ((file)->private_data) | |
372 | ||
373 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) | |
374 | { | |
375 | struct ide_tape_obj *tape = NULL; | |
376 | ||
cf8b8975 | 377 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
378 | tape = idetape_devs[i]; |
379 | if (tape) | |
380 | kref_get(&tape->kref); | |
cf8b8975 | 381 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
382 | return tape; |
383 | } | |
384 | ||
d236d74c | 385 | static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 386 | unsigned int bcount) |
1da177e4 LT |
387 | { |
388 | struct idetape_bh *bh = pc->bh; | |
389 | int count; | |
390 | ||
391 | while (bcount) { | |
1da177e4 LT |
392 | if (bh == NULL) { |
393 | printk(KERN_ERR "ide-tape: bh == NULL in " | |
394 | "idetape_input_buffers\n"); | |
9f87abe8 | 395 | ide_pad_transfer(drive, 0, bcount); |
1da177e4 LT |
396 | return; |
397 | } | |
5a04cfa9 BP |
398 | count = min( |
399 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
400 | bcount); | |
9567b349 | 401 | drive->hwif->input_data(drive, NULL, bh->b_data + |
5a04cfa9 | 402 | atomic_read(&bh->b_count), count); |
1da177e4 LT |
403 | bcount -= count; |
404 | atomic_add(count, &bh->b_count); | |
405 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
406 | bh = bh->b_reqnext; | |
407 | if (bh) | |
408 | atomic_set(&bh->b_count, 0); | |
409 | } | |
410 | } | |
411 | pc->bh = bh; | |
412 | } | |
413 | ||
d236d74c | 414 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 415 | unsigned int bcount) |
1da177e4 LT |
416 | { |
417 | struct idetape_bh *bh = pc->bh; | |
418 | int count; | |
419 | ||
420 | while (bcount) { | |
1da177e4 | 421 | if (bh == NULL) { |
5a04cfa9 BP |
422 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
423 | __func__); | |
1da177e4 LT |
424 | return; |
425 | } | |
1da177e4 | 426 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
9567b349 | 427 | drive->hwif->output_data(drive, NULL, pc->b_data, count); |
1da177e4 LT |
428 | bcount -= count; |
429 | pc->b_data += count; | |
430 | pc->b_count -= count; | |
431 | if (!pc->b_count) { | |
5a04cfa9 BP |
432 | bh = bh->b_reqnext; |
433 | pc->bh = bh; | |
1da177e4 LT |
434 | if (bh) { |
435 | pc->b_data = bh->b_data; | |
436 | pc->b_count = atomic_read(&bh->b_count); | |
437 | } | |
438 | } | |
439 | } | |
440 | } | |
441 | ||
d236d74c | 442 | static void idetape_update_buffers(struct ide_atapi_pc *pc) |
1da177e4 LT |
443 | { |
444 | struct idetape_bh *bh = pc->bh; | |
445 | int count; | |
d236d74c | 446 | unsigned int bcount = pc->xferred; |
1da177e4 | 447 | |
346331f8 | 448 | if (pc->flags & PC_FLAG_WRITING) |
1da177e4 LT |
449 | return; |
450 | while (bcount) { | |
1da177e4 | 451 | if (bh == NULL) { |
5a04cfa9 BP |
452 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
453 | __func__); | |
1da177e4 LT |
454 | return; |
455 | } | |
1da177e4 LT |
456 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
457 | atomic_set(&bh->b_count, count); | |
458 | if (atomic_read(&bh->b_count) == bh->b_size) | |
459 | bh = bh->b_reqnext; | |
460 | bcount -= count; | |
461 | } | |
462 | pc->bh = bh; | |
463 | } | |
464 | ||
465 | /* | |
466 | * idetape_next_pc_storage returns a pointer to a place in which we can | |
467 | * safely store a packet command, even though we intend to leave the | |
468 | * driver. A storage space for a maximum of IDETAPE_PC_STACK packet | |
469 | * commands is allocated at initialization time. | |
470 | */ | |
d236d74c | 471 | static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive) |
1da177e4 LT |
472 | { |
473 | idetape_tape_t *tape = drive->driver_data; | |
474 | ||
8004a8c9 BP |
475 | debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index); |
476 | ||
1da177e4 | 477 | if (tape->pc_stack_index == IDETAPE_PC_STACK) |
5a04cfa9 | 478 | tape->pc_stack_index = 0; |
1da177e4 LT |
479 | return (&tape->pc_stack[tape->pc_stack_index++]); |
480 | } | |
481 | ||
482 | /* | |
483 | * idetape_next_rq_storage is used along with idetape_next_pc_storage. | |
484 | * Since we queue packet commands in the request queue, we need to | |
485 | * allocate a request, along with the allocation of a packet command. | |
486 | */ | |
5a04cfa9 | 487 | |
1da177e4 LT |
488 | /************************************************************** |
489 | * * | |
490 | * This should get fixed to use kmalloc(.., GFP_ATOMIC) * | |
491 | * followed later on by kfree(). -ml * | |
492 | * * | |
493 | **************************************************************/ | |
5a04cfa9 BP |
494 | |
495 | static struct request *idetape_next_rq_storage(ide_drive_t *drive) | |
1da177e4 LT |
496 | { |
497 | idetape_tape_t *tape = drive->driver_data; | |
498 | ||
8004a8c9 BP |
499 | debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index); |
500 | ||
1da177e4 | 501 | if (tape->rq_stack_index == IDETAPE_PC_STACK) |
5a04cfa9 | 502 | tape->rq_stack_index = 0; |
1da177e4 LT |
503 | return (&tape->rq_stack[tape->rq_stack_index++]); |
504 | } | |
505 | ||
1da177e4 | 506 | /* |
1b5db434 BP |
507 | * called on each failed packet command retry to analyze the request sense. We |
508 | * currently do not utilize this information. | |
1da177e4 | 509 | */ |
1b5db434 | 510 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
511 | { |
512 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 513 | struct ide_atapi_pc *pc = tape->failed_pc; |
1da177e4 | 514 | |
1b5db434 BP |
515 | tape->sense_key = sense[2] & 0xF; |
516 | tape->asc = sense[12]; | |
517 | tape->ascq = sense[13]; | |
8004a8c9 BP |
518 | |
519 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
520 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 521 | |
d236d74c | 522 | /* Correct pc->xferred by asking the tape. */ |
346331f8 | 523 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
d236d74c | 524 | pc->xferred = pc->req_xfer - |
54bb2074 | 525 | tape->blk_size * |
5d0cc8ae | 526 | get_unaligned_be32(&sense[3]); |
1da177e4 LT |
527 | idetape_update_buffers(pc); |
528 | } | |
529 | ||
530 | /* | |
531 | * If error was the result of a zero-length read or write command, | |
532 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
533 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
534 | */ | |
90699ce2 | 535 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
536 | /* length == 0 */ |
537 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
538 | if (tape->sense_key == 5) { | |
1da177e4 LT |
539 | /* don't report an error, everything's ok */ |
540 | pc->error = 0; | |
541 | /* don't retry read/write */ | |
346331f8 | 542 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
543 | } |
544 | } | |
90699ce2 | 545 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
1da177e4 | 546 | pc->error = IDETAPE_ERROR_FILEMARK; |
346331f8 | 547 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 548 | } |
90699ce2 | 549 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
550 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
551 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
1da177e4 | 552 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 553 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
554 | } |
555 | } | |
90699ce2 | 556 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 557 | if (tape->sense_key == 8) { |
1da177e4 | 558 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 559 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 560 | } |
346331f8 | 561 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 562 | pc->xferred) |
1da177e4 LT |
563 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
564 | } | |
565 | } | |
566 | ||
d01dbc3b | 567 | /* Free data buffers completely. */ |
077e3bdb | 568 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) |
1da177e4 | 569 | { |
077e3bdb | 570 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; |
d01dbc3b BP |
571 | |
572 | while (bh) { | |
573 | u32 size = bh->b_size; | |
574 | ||
575 | while (size) { | |
576 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
577 | ||
578 | if (bh->b_data) | |
579 | free_pages((unsigned long)bh->b_data, order); | |
580 | ||
581 | size &= (order-1); | |
582 | bh->b_data += (1 << order) * PAGE_SIZE; | |
1da177e4 LT |
583 | } |
584 | prev_bh = bh; | |
585 | bh = bh->b_reqnext; | |
586 | kfree(prev_bh); | |
587 | } | |
077e3bdb | 588 | kfree(tape->merge_bh); |
1da177e4 LT |
589 | } |
590 | ||
1da177e4 LT |
591 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
592 | { | |
593 | struct request *rq = HWGROUP(drive)->rq; | |
594 | idetape_tape_t *tape = drive->driver_data; | |
595 | unsigned long flags; | |
596 | int error; | |
1da177e4 | 597 | |
8004a8c9 | 598 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
599 | |
600 | switch (uptodate) { | |
5a04cfa9 BP |
601 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
602 | case 1: error = 0; break; | |
603 | default: error = uptodate; | |
1da177e4 LT |
604 | } |
605 | rq->errors = error; | |
606 | if (error) | |
607 | tape->failed_pc = NULL; | |
608 | ||
3687221f BZ |
609 | if (!blk_special_request(rq)) { |
610 | ide_end_request(drive, uptodate, nr_sects); | |
611 | return 0; | |
612 | } | |
613 | ||
54bb2074 | 614 | spin_lock_irqsave(&tape->lock, flags); |
1da177e4 | 615 | |
1da177e4 | 616 | ide_end_drive_cmd(drive, 0, 0); |
1da177e4 | 617 | |
54bb2074 | 618 | spin_unlock_irqrestore(&tape->lock, flags); |
1da177e4 LT |
619 | return 0; |
620 | } | |
621 | ||
92f5daff | 622 | static void ide_tape_callback(ide_drive_t *drive) |
1da177e4 LT |
623 | { |
624 | idetape_tape_t *tape = drive->driver_data; | |
5985e6ab BZ |
625 | struct ide_atapi_pc *pc = tape->pc; |
626 | int uptodate = pc->error ? 0 : 1; | |
1da177e4 | 627 | |
8004a8c9 BP |
628 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
629 | ||
dd2e9a03 BZ |
630 | if (tape->failed_pc == pc) |
631 | tape->failed_pc = NULL; | |
632 | ||
5985e6ab BZ |
633 | if (pc->c[0] == REQUEST_SENSE) { |
634 | if (uptodate) | |
635 | idetape_analyze_error(drive, pc->buf); | |
636 | else | |
637 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
638 | "itself - Aborting request!\n"); | |
639 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
640 | struct request *rq = drive->hwif->hwgroup->rq; | |
641 | int blocks = pc->xferred / tape->blk_size; | |
642 | ||
643 | tape->avg_size += blocks * tape->blk_size; | |
644 | ||
645 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
646 | tape->avg_speed = tape->avg_size * HZ / | |
647 | (jiffies - tape->avg_time) / 1024; | |
648 | tape->avg_size = 0; | |
649 | tape->avg_time = jiffies; | |
650 | } | |
651 | ||
652 | tape->first_frame += blocks; | |
653 | rq->current_nr_sectors -= blocks; | |
654 | ||
655 | if (pc->error) | |
656 | uptodate = pc->error; | |
657 | } else if (pc->c[0] == READ_POSITION && uptodate) { | |
658 | u8 *readpos = tape->pc->buf; | |
659 | ||
660 | debug_log(DBG_SENSE, "BOP - %s\n", | |
661 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
662 | debug_log(DBG_SENSE, "EOP - %s\n", | |
663 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
664 | ||
665 | if (readpos[0] & 0x4) { | |
666 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
667 | "to the tape\n"); | |
668 | clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); | |
669 | uptodate = 0; | |
670 | } else { | |
671 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
672 | be32_to_cpu(*(u32 *)&readpos[4])); | |
673 | ||
674 | tape->partition = readpos[1]; | |
675 | tape->first_frame = be32_to_cpu(*(u32 *)&readpos[4]); | |
676 | set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); | |
677 | } | |
1da177e4 | 678 | } |
5985e6ab BZ |
679 | |
680 | idetape_end_request(drive, uptodate, 0); | |
1da177e4 LT |
681 | } |
682 | ||
5985e6ab BZ |
683 | static void idetape_init_pc(struct ide_atapi_pc *pc) |
684 | { | |
685 | memset(pc->c, 0, 12); | |
686 | pc->retries = 0; | |
687 | pc->flags = 0; | |
688 | pc->req_xfer = 0; | |
689 | pc->buf = pc->pc_buf; | |
690 | pc->buf_size = IDETAPE_PC_BUFFER_SIZE; | |
691 | pc->bh = NULL; | |
692 | pc->b_data = NULL; | |
1b06e92a | 693 | pc->callback = ide_tape_callback; |
5985e6ab BZ |
694 | } |
695 | ||
d236d74c | 696 | static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 697 | { |
5a04cfa9 | 698 | idetape_init_pc(pc); |
90699ce2 | 699 | pc->c[0] = REQUEST_SENSE; |
1da177e4 | 700 | pc->c[4] = 20; |
d236d74c | 701 | pc->req_xfer = 20; |
1da177e4 LT |
702 | } |
703 | ||
704 | static void idetape_init_rq(struct request *rq, u8 cmd) | |
705 | { | |
e7b241a7 | 706 | blk_rq_init(NULL, rq); |
4aff5e23 | 707 | rq->cmd_type = REQ_TYPE_SPECIAL; |
1da177e4 LT |
708 | rq->cmd[0] = cmd; |
709 | } | |
710 | ||
711 | /* | |
3c98bf34 BP |
712 | * Generate a new packet command request in front of the request queue, before |
713 | * the current request, so that it will be processed immediately, on the next | |
714 | * pass through the driver. The function below is called from the request | |
715 | * handling part of the driver (the "bottom" part). Safe storage for the request | |
716 | * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that. | |
1da177e4 | 717 | * |
3c98bf34 BP |
718 | * Memory for those requests is pre-allocated at initialization time, and is |
719 | * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for | |
720 | * the maximum possible number of inter-dependent packet commands. | |
1da177e4 | 721 | * |
3c98bf34 BP |
722 | * The higher level of the driver - The ioctl handler and the character device |
723 | * handling functions should queue request to the lower level part and wait for | |
724 | * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail. | |
1da177e4 | 725 | */ |
d236d74c | 726 | static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 727 | struct request *rq) |
1da177e4 LT |
728 | { |
729 | struct ide_tape_obj *tape = drive->driver_data; | |
730 | ||
731 | idetape_init_rq(rq, REQ_IDETAPE_PC1); | |
e8a96aa7 | 732 | rq->cmd_flags |= REQ_PREEMPT; |
1da177e4 LT |
733 | rq->buffer = (char *) pc; |
734 | rq->rq_disk = tape->disk; | |
63f5abb0 | 735 | ide_do_drive_cmd(drive, rq); |
1da177e4 LT |
736 | } |
737 | ||
738 | /* | |
739 | * idetape_retry_pc is called when an error was detected during the | |
740 | * last packet command. We queue a request sense packet command in | |
741 | * the head of the request list. | |
742 | */ | |
258ec411 | 743 | static void idetape_retry_pc(ide_drive_t *drive) |
1da177e4 LT |
744 | { |
745 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 746 | struct ide_atapi_pc *pc; |
1da177e4 | 747 | struct request *rq; |
1da177e4 | 748 | |
64a57fe4 | 749 | (void)ide_read_error(drive); |
1da177e4 LT |
750 | pc = idetape_next_pc_storage(drive); |
751 | rq = idetape_next_rq_storage(drive); | |
752 | idetape_create_request_sense_cmd(pc); | |
346331f8 | 753 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
1da177e4 | 754 | idetape_queue_pc_head(drive, pc, rq); |
1da177e4 LT |
755 | } |
756 | ||
757 | /* | |
3c98bf34 BP |
758 | * Postpone the current request so that ide.c will be able to service requests |
759 | * from another device on the same hwgroup while we are polling for DSC. | |
1da177e4 | 760 | */ |
5a04cfa9 | 761 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
762 | { |
763 | idetape_tape_t *tape = drive->driver_data; | |
764 | ||
8004a8c9 BP |
765 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
766 | ||
1da177e4 | 767 | tape->postponed_rq = HWGROUP(drive)->rq; |
54bb2074 | 768 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
769 | } |
770 | ||
d236d74c | 771 | typedef void idetape_io_buf(ide_drive_t *, struct ide_atapi_pc *, unsigned int); |
a1efc85f | 772 | |
1da177e4 | 773 | /* |
a1efc85f BP |
774 | * This is the usual interrupt handler which will be called during a packet |
775 | * command. We will transfer some of the data (as requested by the drive) and | |
776 | * will re-point interrupt handler to us. When data transfer is finished, we | |
777 | * will act according to the algorithm described before | |
8d06bfad | 778 | * idetape_issue_pc. |
1da177e4 | 779 | */ |
a1efc85f | 780 | static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) |
1da177e4 LT |
781 | { |
782 | ide_hwif_t *hwif = drive->hwif; | |
783 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 784 | struct ide_atapi_pc *pc = tape->pc; |
a1efc85f BP |
785 | xfer_func_t *xferfunc; |
786 | idetape_io_buf *iobuf; | |
1da177e4 | 787 | unsigned int temp; |
790d1239 | 788 | u16 bcount; |
8e7657ae | 789 | u8 stat, ireason; |
1da177e4 | 790 | |
8004a8c9 | 791 | debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__); |
1da177e4 LT |
792 | |
793 | /* Clear the interrupt */ | |
c47137a9 | 794 | stat = ide_read_status(drive); |
1da177e4 | 795 | |
346331f8 | 796 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
5e37bdc0 | 797 | if (hwif->dma_ops->dma_end(drive) || (stat & ERR_STAT)) { |
346331f8 | 798 | pc->flags |= PC_FLAG_DMA_ERROR; |
1da177e4 | 799 | } else { |
d236d74c | 800 | pc->xferred = pc->req_xfer; |
1da177e4 LT |
801 | idetape_update_buffers(pc); |
802 | } | |
8004a8c9 BP |
803 | debug_log(DBG_PROCS, "DMA finished\n"); |
804 | ||
1da177e4 LT |
805 | } |
806 | ||
807 | /* No more interrupts */ | |
22c525b9 | 808 | if ((stat & DRQ_STAT) == 0) { |
8004a8c9 | 809 | debug_log(DBG_SENSE, "Packet command completed, %d bytes" |
d236d74c | 810 | " transferred\n", pc->xferred); |
1da177e4 | 811 | |
346331f8 | 812 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
87429bdc | 813 | local_irq_enable_in_hardirq(); |
1da177e4 | 814 | |
90699ce2 | 815 | if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE) |
22c525b9 | 816 | stat &= ~ERR_STAT; |
346331f8 | 817 | if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) { |
22c525b9 | 818 | /* Error detected */ |
8004a8c9 BP |
819 | debug_log(DBG_ERR, "%s: I/O error\n", tape->name); |
820 | ||
90699ce2 | 821 | if (pc->c[0] == REQUEST_SENSE) { |
568ca927 BZ |
822 | printk(KERN_ERR "%s: I/O error in request sense" |
823 | " command\n", drive->name); | |
1da177e4 LT |
824 | return ide_do_reset(drive); |
825 | } | |
8004a8c9 BP |
826 | debug_log(DBG_ERR, "[cmd %x]: check condition\n", |
827 | pc->c[0]); | |
828 | ||
1da177e4 | 829 | /* Retry operation */ |
258ec411 BZ |
830 | idetape_retry_pc(drive); |
831 | return ide_stopped; | |
1da177e4 LT |
832 | } |
833 | pc->error = 0; | |
346331f8 | 834 | if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && |
22c525b9 | 835 | (stat & SEEK_STAT) == 0) { |
1da177e4 LT |
836 | /* Media access command */ |
837 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 838 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; |
1da177e4 LT |
839 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; |
840 | /* Allow ide.c to handle other requests */ | |
841 | idetape_postpone_request(drive); | |
842 | return ide_stopped; | |
843 | } | |
1da177e4 | 844 | /* Command finished - Call the callback function */ |
1b06e92a | 845 | pc->callback(drive); |
92f5daff | 846 | return ide_stopped; |
1da177e4 | 847 | } |
346331f8 BP |
848 | |
849 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { | |
850 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; | |
568ca927 BZ |
851 | printk(KERN_ERR "%s: The device wants to issue more interrupts " |
852 | "in DMA mode\n", drive->name); | |
7469aaf6 | 853 | ide_dma_off(drive); |
1da177e4 LT |
854 | return ide_do_reset(drive); |
855 | } | |
856 | /* Get the number of bytes to transfer on this interrupt. */ | |
4c3032d8 BZ |
857 | bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) | |
858 | hwif->INB(hwif->io_ports.lbam_addr); | |
1da177e4 | 859 | |
4c3032d8 | 860 | ireason = hwif->INB(hwif->io_ports.nsect_addr); |
1da177e4 | 861 | |
8e7657ae | 862 | if (ireason & CD) { |
568ca927 | 863 | printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__); |
1da177e4 LT |
864 | return ide_do_reset(drive); |
865 | } | |
346331f8 | 866 | if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) { |
1da177e4 | 867 | /* Hopefully, we will never get here */ |
568ca927 BZ |
868 | printk(KERN_ERR "%s: We wanted to %s, but the device wants us " |
869 | "to %s!\n", drive->name, | |
870 | (ireason & IO) ? "Write" : "Read", | |
8e7657ae | 871 | (ireason & IO) ? "Read" : "Write"); |
1da177e4 LT |
872 | return ide_do_reset(drive); |
873 | } | |
346331f8 | 874 | if (!(pc->flags & PC_FLAG_WRITING)) { |
1da177e4 | 875 | /* Reading - Check that we have enough space */ |
d236d74c BP |
876 | temp = pc->xferred + bcount; |
877 | if (temp > pc->req_xfer) { | |
878 | if (temp > pc->buf_size) { | |
568ca927 BZ |
879 | printk(KERN_ERR "%s: The device wants to send " |
880 | "us more data than expected - " | |
881 | "discarding data\n", | |
882 | drive->name); | |
9f87abe8 | 883 | ide_pad_transfer(drive, 0, bcount); |
a1efc85f BP |
884 | ide_set_handler(drive, &idetape_pc_intr, |
885 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
886 | return ide_started; |
887 | } | |
568ca927 | 888 | debug_log(DBG_SENSE, "The device wants to send us more " |
8004a8c9 | 889 | "data than expected - allowing transfer\n"); |
1da177e4 | 890 | } |
a1efc85f | 891 | iobuf = &idetape_input_buffers; |
9567b349 | 892 | xferfunc = hwif->input_data; |
1da177e4 | 893 | } else { |
a1efc85f | 894 | iobuf = &idetape_output_buffers; |
9567b349 | 895 | xferfunc = hwif->output_data; |
1da177e4 | 896 | } |
a1efc85f BP |
897 | |
898 | if (pc->bh) | |
899 | iobuf(drive, pc, bcount); | |
900 | else | |
9567b349 | 901 | xferfunc(drive, NULL, pc->cur_pos, bcount); |
a1efc85f | 902 | |
1da177e4 | 903 | /* Update the current position */ |
d236d74c BP |
904 | pc->xferred += bcount; |
905 | pc->cur_pos += bcount; | |
8004a8c9 BP |
906 | |
907 | debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n", | |
908 | pc->c[0], bcount); | |
909 | ||
1da177e4 LT |
910 | /* And set the interrupt handler again */ |
911 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); | |
912 | return ide_started; | |
913 | } | |
914 | ||
915 | /* | |
3c98bf34 | 916 | * Packet Command Interface |
1da177e4 | 917 | * |
3c98bf34 BP |
918 | * The current Packet Command is available in tape->pc, and will not change |
919 | * until we finish handling it. Each packet command is associated with a | |
920 | * callback function that will be called when the command is finished. | |
1da177e4 | 921 | * |
3c98bf34 | 922 | * The handling will be done in three stages: |
1da177e4 | 923 | * |
3c98bf34 BP |
924 | * 1. idetape_issue_pc will send the packet command to the drive, and will set |
925 | * the interrupt handler to idetape_pc_intr. | |
1da177e4 | 926 | * |
3c98bf34 BP |
927 | * 2. On each interrupt, idetape_pc_intr will be called. This step will be |
928 | * repeated until the device signals us that no more interrupts will be issued. | |
1da177e4 | 929 | * |
3c98bf34 BP |
930 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
931 | * process. In case of a successful initiation of a media access packet command, | |
932 | * the DSC bit will be set when the actual execution of the command is finished. | |
933 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
934 | * event. In this case, we define the request as "low priority request" by | |
935 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
936 | * exit the driver. | |
1da177e4 | 937 | * |
3c98bf34 BP |
938 | * ide.c will then give higher priority to requests which originate from the |
939 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 940 | * |
3c98bf34 | 941 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 942 | * |
3c98bf34 BP |
943 | * 5. In case an error was found, we queue a request sense packet command in |
944 | * front of the request queue and retry the operation up to | |
945 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 946 | * |
3c98bf34 BP |
947 | * 6. In case no error was found, or we decided to give up and not to retry |
948 | * again, the callback function will be called and then we will handle the next | |
949 | * request. | |
1da177e4 | 950 | */ |
5a7b75ab BZ |
951 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) |
952 | { | |
5a7b75ab | 953 | idetape_tape_t *tape = drive->driver_data; |
5a7b75ab | 954 | |
594c16d8 BZ |
955 | return ide_transfer_pc(drive, tape->pc, idetape_pc_intr, |
956 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
957 | } |
958 | ||
d236d74c BP |
959 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
960 | struct ide_atapi_pc *pc) | |
1da177e4 | 961 | { |
1da177e4 | 962 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 963 | |
90699ce2 BP |
964 | if (tape->pc->c[0] == REQUEST_SENSE && |
965 | pc->c[0] == REQUEST_SENSE) { | |
1da177e4 LT |
966 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
967 | "Two request sense in serial were issued\n"); | |
968 | } | |
1da177e4 | 969 | |
90699ce2 | 970 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
1da177e4 LT |
971 | tape->failed_pc = pc; |
972 | /* Set the current packet command */ | |
973 | tape->pc = pc; | |
974 | ||
975 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 976 | (pc->flags & PC_FLAG_ABORT)) { |
1da177e4 | 977 | /* |
3c98bf34 BP |
978 | * We will "abort" retrying a packet command in case legitimate |
979 | * error code was received (crossing a filemark, or end of the | |
980 | * media, for example). | |
1da177e4 | 981 | */ |
346331f8 | 982 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 983 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
984 | tape->sense_key == 2 && tape->asc == 4 && |
985 | (tape->ascq == 1 || tape->ascq == 8))) { | |
986 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
987 | "pc = %2x, key = %2x, " | |
988 | "asc = %2x, ascq = %2x\n", | |
989 | tape->name, pc->c[0], | |
990 | tape->sense_key, tape->asc, | |
991 | tape->ascq); | |
992 | } | |
993 | /* Giving up */ | |
994 | pc->error = IDETAPE_ERROR_GENERAL; | |
995 | } | |
996 | tape->failed_pc = NULL; | |
1b06e92a | 997 | pc->callback(drive); |
92f5daff | 998 | return ide_stopped; |
1da177e4 | 999 | } |
8004a8c9 | 1000 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
1001 | |
1002 | pc->retries++; | |
2fc57388 | 1003 | |
6bf1641c BZ |
1004 | return ide_issue_pc(drive, pc, idetape_transfer_pc, |
1005 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
1006 | } |
1007 | ||
3c98bf34 | 1008 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 1009 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 LT |
1010 | { |
1011 | idetape_init_pc(pc); | |
90699ce2 | 1012 | pc->c[0] = MODE_SENSE; |
1da177e4 | 1013 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
1014 | /* DBD = 1 - Don't return block descriptors */ |
1015 | pc->c[1] = 8; | |
1da177e4 LT |
1016 | pc->c[2] = page_code; |
1017 | /* | |
1018 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
1019 | * | |
1020 | * For SCSI this byte is defined as subpage instead of high byte | |
1021 | * of length and some IDE drives seem to interpret it this way | |
1022 | * and return an error when 255 is used. | |
1023 | */ | |
1024 | pc->c[3] = 0; | |
3c98bf34 BP |
1025 | /* We will just discard data in that case */ |
1026 | pc->c[4] = 255; | |
1da177e4 | 1027 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 1028 | pc->req_xfer = 12; |
1da177e4 | 1029 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 1030 | pc->req_xfer = 24; |
1da177e4 | 1031 | else |
d236d74c | 1032 | pc->req_xfer = 50; |
1da177e4 LT |
1033 | } |
1034 | ||
5a04cfa9 | 1035 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 LT |
1036 | { |
1037 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1038 | struct ide_atapi_pc *pc = tape->pc; |
22c525b9 | 1039 | u8 stat; |
1da177e4 | 1040 | |
c47137a9 BZ |
1041 | stat = ide_read_status(drive); |
1042 | ||
22c525b9 BZ |
1043 | if (stat & SEEK_STAT) { |
1044 | if (stat & ERR_STAT) { | |
1da177e4 | 1045 | /* Error detected */ |
90699ce2 | 1046 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
1047 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
1048 | tape->name); | |
1049 | /* Retry operation */ | |
258ec411 BZ |
1050 | idetape_retry_pc(drive); |
1051 | return ide_stopped; | |
1da177e4 LT |
1052 | } |
1053 | pc->error = 0; | |
1da177e4 LT |
1054 | } else { |
1055 | pc->error = IDETAPE_ERROR_GENERAL; | |
1056 | tape->failed_pc = NULL; | |
1057 | } | |
1b06e92a | 1058 | pc->callback(drive); |
92f5daff | 1059 | return ide_stopped; |
1da177e4 LT |
1060 | } |
1061 | ||
d236d74c BP |
1062 | static void idetape_create_read_cmd(idetape_tape_t *tape, |
1063 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1064 | unsigned int length, struct idetape_bh *bh) |
1da177e4 LT |
1065 | { |
1066 | idetape_init_pc(pc); | |
90699ce2 | 1067 | pc->c[0] = READ_6; |
860ff5ec | 1068 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 1069 | pc->c[1] = 1; |
1da177e4 LT |
1070 | pc->bh = bh; |
1071 | atomic_set(&bh->b_count, 0); | |
d236d74c BP |
1072 | pc->buf = NULL; |
1073 | pc->buf_size = length * tape->blk_size; | |
1074 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 1075 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 1076 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 LT |
1077 | } |
1078 | ||
d236d74c BP |
1079 | static void idetape_create_write_cmd(idetape_tape_t *tape, |
1080 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1081 | unsigned int length, struct idetape_bh *bh) |
1da177e4 LT |
1082 | { |
1083 | idetape_init_pc(pc); | |
90699ce2 | 1084 | pc->c[0] = WRITE_6; |
860ff5ec | 1085 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 1086 | pc->c[1] = 1; |
346331f8 | 1087 | pc->flags |= PC_FLAG_WRITING; |
1da177e4 LT |
1088 | pc->bh = bh; |
1089 | pc->b_data = bh->b_data; | |
1090 | pc->b_count = atomic_read(&bh->b_count); | |
d236d74c BP |
1091 | pc->buf = NULL; |
1092 | pc->buf_size = length * tape->blk_size; | |
1093 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 1094 | if (pc->req_xfer == tape->buffer_size) |
5e331095 | 1095 | pc->flags |= PC_FLAG_DMA_OK; |
1da177e4 LT |
1096 | } |
1097 | ||
1da177e4 LT |
1098 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
1099 | struct request *rq, sector_t block) | |
1100 | { | |
1101 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1102 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 1103 | struct request *postponed_rq = tape->postponed_rq; |
22c525b9 | 1104 | u8 stat; |
1da177e4 | 1105 | |
8004a8c9 BP |
1106 | debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld," |
1107 | " current_nr_sectors: %d\n", | |
1da177e4 | 1108 | rq->sector, rq->nr_sectors, rq->current_nr_sectors); |
1da177e4 | 1109 | |
4aff5e23 | 1110 | if (!blk_special_request(rq)) { |
3c98bf34 | 1111 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 1112 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 1113 | "request queue (%d)\n", drive->name, rq->cmd_type); |
1da177e4 LT |
1114 | ide_end_request(drive, 0, 0); |
1115 | return ide_stopped; | |
1116 | } | |
1117 | ||
3c98bf34 | 1118 | /* Retry a failed packet command */ |
28c7214b BZ |
1119 | if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) { |
1120 | pc = tape->failed_pc; | |
1121 | goto out; | |
1122 | } | |
5a04cfa9 | 1123 | |
1da177e4 LT |
1124 | if (postponed_rq != NULL) |
1125 | if (rq != postponed_rq) { | |
1126 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
1127 | "Two DSC requests were queued\n"); | |
1128 | idetape_end_request(drive, 0, 0); | |
1129 | return ide_stopped; | |
1130 | } | |
1da177e4 LT |
1131 | |
1132 | tape->postponed_rq = NULL; | |
1133 | ||
1134 | /* | |
1135 | * If the tape is still busy, postpone our request and service | |
1136 | * the other device meanwhile. | |
1137 | */ | |
c47137a9 | 1138 | stat = ide_read_status(drive); |
1da177e4 LT |
1139 | |
1140 | if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) | |
346331f8 | 1141 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
1da177e4 LT |
1142 | |
1143 | if (drive->post_reset == 1) { | |
346331f8 | 1144 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
1da177e4 LT |
1145 | drive->post_reset = 0; |
1146 | } | |
1147 | ||
346331f8 | 1148 | if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) && |
22c525b9 | 1149 | (stat & SEEK_STAT) == 0) { |
1da177e4 LT |
1150 | if (postponed_rq == NULL) { |
1151 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 1152 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
1153 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
1154 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
1155 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
1156 | tape->name); | |
1157 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { | |
1158 | idetape_media_access_finished(drive); | |
1159 | return ide_stopped; | |
1160 | } else { | |
1161 | return ide_do_reset(drive); | |
1162 | } | |
5a04cfa9 BP |
1163 | } else if (time_after(jiffies, |
1164 | tape->dsc_polling_start + | |
1165 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 1166 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
1167 | idetape_postpone_request(drive); |
1168 | return ide_stopped; | |
1169 | } | |
1170 | if (rq->cmd[0] & REQ_IDETAPE_READ) { | |
1da177e4 | 1171 | pc = idetape_next_pc_storage(drive); |
5a04cfa9 BP |
1172 | idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, |
1173 | (struct idetape_bh *)rq->special); | |
1da177e4 LT |
1174 | goto out; |
1175 | } | |
1176 | if (rq->cmd[0] & REQ_IDETAPE_WRITE) { | |
1da177e4 | 1177 | pc = idetape_next_pc_storage(drive); |
5a04cfa9 BP |
1178 | idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, |
1179 | (struct idetape_bh *)rq->special); | |
1da177e4 LT |
1180 | goto out; |
1181 | } | |
1da177e4 | 1182 | if (rq->cmd[0] & REQ_IDETAPE_PC1) { |
d236d74c | 1183 | pc = (struct ide_atapi_pc *) rq->buffer; |
1da177e4 LT |
1184 | rq->cmd[0] &= ~(REQ_IDETAPE_PC1); |
1185 | rq->cmd[0] |= REQ_IDETAPE_PC2; | |
1186 | goto out; | |
1187 | } | |
1188 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { | |
1189 | idetape_media_access_finished(drive); | |
1190 | return ide_stopped; | |
1191 | } | |
1192 | BUG(); | |
1193 | out: | |
28c7214b BZ |
1194 | if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags)) |
1195 | pc->flags |= PC_FLAG_DRQ_INTERRUPT; | |
1196 | ||
8d06bfad | 1197 | return idetape_issue_pc(drive, pc); |
1da177e4 LT |
1198 | } |
1199 | ||
1da177e4 | 1200 | /* |
41aa1706 | 1201 | * The function below uses __get_free_pages to allocate a data buffer of size |
f73850a3 | 1202 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
3c98bf34 | 1203 | * much as possible. |
1da177e4 | 1204 | * |
41aa1706 BP |
1205 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
1206 | * failure. | |
1da177e4 | 1207 | */ |
077e3bdb BP |
1208 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, |
1209 | int full, int clear) | |
1da177e4 | 1210 | { |
077e3bdb | 1211 | struct idetape_bh *prev_bh, *bh, *merge_bh; |
a997a435 | 1212 | int pages = tape->pages_per_buffer; |
41aa1706 | 1213 | unsigned int order, b_allocd; |
1da177e4 LT |
1214 | char *b_data = NULL; |
1215 | ||
077e3bdb BP |
1216 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1217 | bh = merge_bh; | |
1da177e4 LT |
1218 | if (bh == NULL) |
1219 | goto abort; | |
41aa1706 BP |
1220 | |
1221 | order = fls(pages) - 1; | |
1222 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 1223 | if (!bh->b_data) |
1da177e4 | 1224 | goto abort; |
41aa1706 BP |
1225 | b_allocd = (1 << order) * PAGE_SIZE; |
1226 | pages &= (order-1); | |
1227 | ||
1da177e4 | 1228 | if (clear) |
41aa1706 BP |
1229 | memset(bh->b_data, 0, b_allocd); |
1230 | bh->b_reqnext = NULL; | |
1231 | bh->b_size = b_allocd; | |
1da177e4 LT |
1232 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1233 | ||
41aa1706 BP |
1234 | while (pages) { |
1235 | order = fls(pages) - 1; | |
1236 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 1237 | if (!b_data) |
1da177e4 | 1238 | goto abort; |
41aa1706 BP |
1239 | b_allocd = (1 << order) * PAGE_SIZE; |
1240 | ||
1da177e4 | 1241 | if (clear) |
41aa1706 BP |
1242 | memset(b_data, 0, b_allocd); |
1243 | ||
1244 | /* newly allocated page frames below buffer header or ...*/ | |
1245 | if (bh->b_data == b_data + b_allocd) { | |
1246 | bh->b_size += b_allocd; | |
1247 | bh->b_data -= b_allocd; | |
1da177e4 | 1248 | if (full) |
41aa1706 | 1249 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1250 | continue; |
1251 | } | |
41aa1706 | 1252 | /* they are above the header */ |
1da177e4 | 1253 | if (b_data == bh->b_data + bh->b_size) { |
41aa1706 | 1254 | bh->b_size += b_allocd; |
1da177e4 | 1255 | if (full) |
41aa1706 | 1256 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1257 | continue; |
1258 | } | |
1259 | prev_bh = bh; | |
5a04cfa9 BP |
1260 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1261 | if (!bh) { | |
41aa1706 | 1262 | free_pages((unsigned long) b_data, order); |
1da177e4 LT |
1263 | goto abort; |
1264 | } | |
1265 | bh->b_reqnext = NULL; | |
1266 | bh->b_data = b_data; | |
41aa1706 | 1267 | bh->b_size = b_allocd; |
1da177e4 LT |
1268 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1269 | prev_bh->b_reqnext = bh; | |
41aa1706 BP |
1270 | |
1271 | pages &= (order-1); | |
1da177e4 | 1272 | } |
41aa1706 | 1273 | |
1da177e4 LT |
1274 | bh->b_size -= tape->excess_bh_size; |
1275 | if (full) | |
1276 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
077e3bdb | 1277 | return merge_bh; |
1da177e4 | 1278 | abort: |
077e3bdb | 1279 | ide_tape_kfree_buffer(tape); |
1da177e4 LT |
1280 | return NULL; |
1281 | } | |
1282 | ||
5a04cfa9 | 1283 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
8646c88f | 1284 | const char __user *buf, int n) |
1da177e4 LT |
1285 | { |
1286 | struct idetape_bh *bh = tape->bh; | |
1287 | int count; | |
dcd96379 | 1288 | int ret = 0; |
1da177e4 LT |
1289 | |
1290 | while (n) { | |
1da177e4 | 1291 | if (bh == NULL) { |
5a04cfa9 BP |
1292 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1293 | __func__); | |
dcd96379 | 1294 | return 1; |
1da177e4 | 1295 | } |
5a04cfa9 BP |
1296 | count = min((unsigned int) |
1297 | (bh->b_size - atomic_read(&bh->b_count)), | |
1298 | (unsigned int)n); | |
1299 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
1300 | count)) | |
dcd96379 | 1301 | ret = 1; |
1da177e4 LT |
1302 | n -= count; |
1303 | atomic_add(count, &bh->b_count); | |
1304 | buf += count; | |
1305 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
1306 | bh = bh->b_reqnext; | |
1307 | if (bh) | |
1308 | atomic_set(&bh->b_count, 0); | |
1309 | } | |
1310 | } | |
1311 | tape->bh = bh; | |
dcd96379 | 1312 | return ret; |
1da177e4 LT |
1313 | } |
1314 | ||
5a04cfa9 | 1315 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
99d74e61 | 1316 | int n) |
1da177e4 LT |
1317 | { |
1318 | struct idetape_bh *bh = tape->bh; | |
1319 | int count; | |
dcd96379 | 1320 | int ret = 0; |
1da177e4 LT |
1321 | |
1322 | while (n) { | |
1da177e4 | 1323 | if (bh == NULL) { |
5a04cfa9 BP |
1324 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1325 | __func__); | |
dcd96379 | 1326 | return 1; |
1da177e4 | 1327 | } |
1da177e4 | 1328 | count = min(tape->b_count, n); |
dcd96379 DW |
1329 | if (copy_to_user(buf, tape->b_data, count)) |
1330 | ret = 1; | |
1da177e4 LT |
1331 | n -= count; |
1332 | tape->b_data += count; | |
1333 | tape->b_count -= count; | |
1334 | buf += count; | |
1335 | if (!tape->b_count) { | |
5a04cfa9 BP |
1336 | bh = bh->b_reqnext; |
1337 | tape->bh = bh; | |
1da177e4 LT |
1338 | if (bh) { |
1339 | tape->b_data = bh->b_data; | |
1340 | tape->b_count = atomic_read(&bh->b_count); | |
1341 | } | |
1342 | } | |
1343 | } | |
dcd96379 | 1344 | return ret; |
1da177e4 LT |
1345 | } |
1346 | ||
077e3bdb | 1347 | static void idetape_init_merge_buffer(idetape_tape_t *tape) |
1da177e4 | 1348 | { |
077e3bdb BP |
1349 | struct idetape_bh *bh = tape->merge_bh; |
1350 | tape->bh = tape->merge_bh; | |
5a04cfa9 | 1351 | |
54abf37e | 1352 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 LT |
1353 | atomic_set(&bh->b_count, 0); |
1354 | else { | |
1355 | tape->b_data = bh->b_data; | |
1356 | tape->b_count = atomic_read(&bh->b_count); | |
1357 | } | |
1358 | } | |
1359 | ||
1da177e4 | 1360 | /* |
3c98bf34 BP |
1361 | * Write a filemark if write_filemark=1. Flush the device buffers without |
1362 | * writing a filemark otherwise. | |
1da177e4 | 1363 | */ |
5a04cfa9 | 1364 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 1365 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 LT |
1366 | { |
1367 | idetape_init_pc(pc); | |
90699ce2 | 1368 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 1369 | pc->c[4] = write_filemark; |
346331f8 | 1370 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1371 | } |
1372 | ||
d236d74c | 1373 | static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1374 | { |
1375 | idetape_init_pc(pc); | |
90699ce2 | 1376 | pc->c[0] = TEST_UNIT_READY; |
1da177e4 LT |
1377 | } |
1378 | ||
1379 | /* | |
3c98bf34 BP |
1380 | * We add a special packet command request to the tail of the request queue, and |
1381 | * wait for it to be serviced. This is not to be called from within the request | |
1382 | * handling part of the driver! We allocate here data on the stack and it is | |
1383 | * valid until the request is finished. This is not the case for the bottom part | |
1384 | * of the driver, where we are always leaving the functions to wait for an | |
1385 | * interrupt or a timer event. | |
1da177e4 | 1386 | * |
3c98bf34 BP |
1387 | * From the bottom part of the driver, we should allocate safe memory using |
1388 | * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request | |
1389 | * to the request list without waiting for it to be serviced! In that case, we | |
1390 | * usually use idetape_queue_pc_head(). | |
1da177e4 | 1391 | */ |
ea1ab3d3 | 1392 | static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
1393 | { |
1394 | struct ide_tape_obj *tape = drive->driver_data; | |
64ea1b4a FT |
1395 | struct request *rq; |
1396 | int error; | |
1da177e4 | 1397 | |
64ea1b4a FT |
1398 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1399 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
1400 | rq->cmd[0] = REQ_IDETAPE_PC1; | |
1401 | rq->buffer = (char *)pc; | |
1402 | error = blk_execute_rq(drive->queue, tape->disk, rq, 0); | |
1403 | blk_put_request(rq); | |
1404 | return error; | |
1da177e4 LT |
1405 | } |
1406 | ||
d236d74c BP |
1407 | static void idetape_create_load_unload_cmd(ide_drive_t *drive, |
1408 | struct ide_atapi_pc *pc, int cmd) | |
1da177e4 LT |
1409 | { |
1410 | idetape_init_pc(pc); | |
90699ce2 | 1411 | pc->c[0] = START_STOP; |
1da177e4 | 1412 | pc->c[4] = cmd; |
346331f8 | 1413 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1414 | } |
1415 | ||
1416 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) | |
1417 | { | |
1418 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1419 | struct ide_atapi_pc pc; |
1da177e4 LT |
1420 | int load_attempted = 0; |
1421 | ||
3c98bf34 | 1422 | /* Wait for the tape to become ready */ |
346331f8 | 1423 | set_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); |
1da177e4 LT |
1424 | timeout += jiffies; |
1425 | while (time_before(jiffies, timeout)) { | |
1426 | idetape_create_test_unit_ready_cmd(&pc); | |
ea1ab3d3 | 1427 | if (!idetape_queue_pc_tail(drive, &pc)) |
1da177e4 LT |
1428 | return 0; |
1429 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
1430 | || (tape->asc == 0x3A)) { |
1431 | /* no media */ | |
1da177e4 LT |
1432 | if (load_attempted) |
1433 | return -ENOMEDIUM; | |
5a04cfa9 BP |
1434 | idetape_create_load_unload_cmd(drive, &pc, |
1435 | IDETAPE_LU_LOAD_MASK); | |
ea1ab3d3 | 1436 | idetape_queue_pc_tail(drive, &pc); |
1da177e4 LT |
1437 | load_attempted = 1; |
1438 | /* not about to be ready */ | |
1439 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1440 | (tape->ascq == 1 || tape->ascq == 8))) | |
1441 | return -EIO; | |
80ce45fd | 1442 | msleep(100); |
1da177e4 LT |
1443 | } |
1444 | return -EIO; | |
1445 | } | |
1446 | ||
5a04cfa9 | 1447 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 1448 | { |
d236d74c | 1449 | struct ide_atapi_pc pc; |
1da177e4 LT |
1450 | int rc; |
1451 | ||
1452 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
5a04cfa9 BP |
1453 | rc = idetape_queue_pc_tail(drive, &pc); |
1454 | if (rc) | |
1da177e4 LT |
1455 | return rc; |
1456 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1457 | return 0; | |
1458 | } | |
1459 | ||
d236d74c | 1460 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1461 | { |
1462 | idetape_init_pc(pc); | |
90699ce2 | 1463 | pc->c[0] = READ_POSITION; |
d236d74c | 1464 | pc->req_xfer = 20; |
1da177e4 LT |
1465 | } |
1466 | ||
5a04cfa9 | 1467 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
1468 | { |
1469 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1470 | struct ide_atapi_pc pc; |
1da177e4 LT |
1471 | int position; |
1472 | ||
8004a8c9 | 1473 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
1474 | |
1475 | idetape_create_read_position_cmd(&pc); | |
1476 | if (idetape_queue_pc_tail(drive, &pc)) | |
1477 | return -1; | |
54bb2074 | 1478 | position = tape->first_frame; |
1da177e4 LT |
1479 | return position; |
1480 | } | |
1481 | ||
d236d74c BP |
1482 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
1483 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1484 | unsigned int block, u8 partition, int skip) |
1da177e4 LT |
1485 | { |
1486 | idetape_init_pc(pc); | |
90699ce2 | 1487 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 1488 | pc->c[1] = 2; |
860ff5ec | 1489 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 1490 | pc->c[8] = partition; |
346331f8 | 1491 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1492 | } |
1493 | ||
d236d74c BP |
1494 | static int idetape_create_prevent_cmd(ide_drive_t *drive, |
1495 | struct ide_atapi_pc *pc, int prevent) | |
1da177e4 LT |
1496 | { |
1497 | idetape_tape_t *tape = drive->driver_data; | |
1498 | ||
b6422013 BP |
1499 | /* device supports locking according to capabilities page */ |
1500 | if (!(tape->caps[6] & 0x01)) | |
1da177e4 LT |
1501 | return 0; |
1502 | ||
1503 | idetape_init_pc(pc); | |
90699ce2 | 1504 | pc->c[0] = ALLOW_MEDIUM_REMOVAL; |
1da177e4 | 1505 | pc->c[4] = prevent; |
1da177e4 LT |
1506 | return 1; |
1507 | } | |
1508 | ||
ec0fdb01 | 1509 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1510 | { |
1511 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1512 | |
54abf37e | 1513 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 1514 | return; |
1da177e4 | 1515 | |
83042b24 | 1516 | clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags); |
01a63aeb | 1517 | tape->merge_bh_size = 0; |
077e3bdb BP |
1518 | if (tape->merge_bh != NULL) { |
1519 | ide_tape_kfree_buffer(tape); | |
1520 | tape->merge_bh = NULL; | |
1da177e4 LT |
1521 | } |
1522 | ||
54abf37e | 1523 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1524 | } |
1525 | ||
1526 | /* | |
3c98bf34 BP |
1527 | * Position the tape to the requested block using the LOCATE packet command. |
1528 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1529 | * all higher level operations, we queue the commands at the tail of the request | |
1530 | * queue and wait for their completion. | |
1da177e4 | 1531 | */ |
5a04cfa9 BP |
1532 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
1533 | u8 partition, int skip) | |
1da177e4 LT |
1534 | { |
1535 | idetape_tape_t *tape = drive->driver_data; | |
1536 | int retval; | |
d236d74c | 1537 | struct ide_atapi_pc pc; |
1da177e4 | 1538 | |
54abf37e | 1539 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 1540 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1541 | idetape_wait_ready(drive, 60 * 5 * HZ); |
1542 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
1543 | retval = idetape_queue_pc_tail(drive, &pc); | |
1544 | if (retval) | |
1545 | return (retval); | |
1546 | ||
1547 | idetape_create_read_position_cmd(&pc); | |
1548 | return (idetape_queue_pc_tail(drive, &pc)); | |
1549 | } | |
1550 | ||
ec0fdb01 | 1551 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 1552 | int restore_position) |
1da177e4 LT |
1553 | { |
1554 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1555 | int seek, position; |
1556 | ||
ec0fdb01 | 1557 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1558 | if (restore_position) { |
1559 | position = idetape_read_position(drive); | |
9798630a | 1560 | seek = position > 0 ? position : 0; |
1da177e4 | 1561 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 1562 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 1563 | " %s\n", tape->name, __func__); |
1da177e4 LT |
1564 | return; |
1565 | } | |
1566 | } | |
1567 | } | |
1568 | ||
1569 | /* | |
3c98bf34 BP |
1570 | * Generate a read/write request for the block device interface and wait for it |
1571 | * to be serviced. | |
1da177e4 | 1572 | */ |
5a04cfa9 BP |
1573 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
1574 | struct idetape_bh *bh) | |
1da177e4 LT |
1575 | { |
1576 | idetape_tape_t *tape = drive->driver_data; | |
64ea1b4a FT |
1577 | struct request *rq; |
1578 | int ret, errors; | |
1da177e4 | 1579 | |
8004a8c9 BP |
1580 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
1581 | ||
64ea1b4a FT |
1582 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
1583 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
1584 | rq->cmd[0] = cmd; | |
1585 | rq->rq_disk = tape->disk; | |
1586 | rq->special = (void *)bh; | |
1587 | rq->sector = tape->first_frame; | |
1588 | rq->nr_sectors = blocks; | |
1589 | rq->current_nr_sectors = blocks; | |
1590 | blk_execute_rq(drive->queue, tape->disk, rq, 0); | |
1591 | ||
1592 | errors = rq->errors; | |
1593 | ret = tape->blk_size * (blocks - rq->current_nr_sectors); | |
1594 | blk_put_request(rq); | |
1da177e4 LT |
1595 | |
1596 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1597 | return 0; | |
1598 | ||
077e3bdb BP |
1599 | if (tape->merge_bh) |
1600 | idetape_init_merge_buffer(tape); | |
64ea1b4a | 1601 | if (errors == IDETAPE_ERROR_GENERAL) |
1da177e4 | 1602 | return -EIO; |
64ea1b4a | 1603 | return ret; |
1da177e4 LT |
1604 | } |
1605 | ||
d236d74c | 1606 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1607 | { |
1608 | idetape_init_pc(pc); | |
90699ce2 | 1609 | pc->c[0] = INQUIRY; |
5a04cfa9 | 1610 | pc->c[4] = 254; |
d236d74c | 1611 | pc->req_xfer = 254; |
1da177e4 LT |
1612 | } |
1613 | ||
d236d74c BP |
1614 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
1615 | struct ide_atapi_pc *pc) | |
1da177e4 LT |
1616 | { |
1617 | idetape_init_pc(pc); | |
90699ce2 | 1618 | pc->c[0] = REZERO_UNIT; |
346331f8 | 1619 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1620 | } |
1621 | ||
d236d74c | 1622 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1623 | { |
1624 | idetape_init_pc(pc); | |
90699ce2 | 1625 | pc->c[0] = ERASE; |
1da177e4 | 1626 | pc->c[1] = 1; |
346331f8 | 1627 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1628 | } |
1629 | ||
d236d74c | 1630 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 LT |
1631 | { |
1632 | idetape_init_pc(pc); | |
90699ce2 | 1633 | pc->c[0] = SPACE; |
860ff5ec | 1634 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 1635 | pc->c[1] = cmd; |
346331f8 | 1636 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
1da177e4 LT |
1637 | } |
1638 | ||
97c566ce | 1639 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 1640 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1641 | { |
1642 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1643 | |
8004a8c9 | 1644 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 1645 | |
0aa4b01e | 1646 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
077e3bdb | 1647 | blocks, tape->merge_bh); |
1da177e4 LT |
1648 | } |
1649 | ||
d9df937a | 1650 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1651 | { |
1652 | idetape_tape_t *tape = drive->driver_data; | |
1653 | int blocks, min; | |
1654 | struct idetape_bh *bh; | |
55a5d291 | 1655 | |
54abf37e | 1656 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 1657 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 1658 | " but we are not writing.\n"); |
1da177e4 LT |
1659 | return; |
1660 | } | |
01a63aeb | 1661 | if (tape->merge_bh_size > tape->buffer_size) { |
1da177e4 | 1662 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
01a63aeb | 1663 | tape->merge_bh_size = tape->buffer_size; |
1da177e4 | 1664 | } |
01a63aeb BP |
1665 | if (tape->merge_bh_size) { |
1666 | blocks = tape->merge_bh_size / tape->blk_size; | |
1667 | if (tape->merge_bh_size % tape->blk_size) { | |
1da177e4 LT |
1668 | unsigned int i; |
1669 | ||
1670 | blocks++; | |
01a63aeb | 1671 | i = tape->blk_size - tape->merge_bh_size % |
54bb2074 | 1672 | tape->blk_size; |
1da177e4 LT |
1673 | bh = tape->bh->b_reqnext; |
1674 | while (bh) { | |
1675 | atomic_set(&bh->b_count, 0); | |
1676 | bh = bh->b_reqnext; | |
1677 | } | |
1678 | bh = tape->bh; | |
1679 | while (i) { | |
1680 | if (bh == NULL) { | |
5a04cfa9 BP |
1681 | printk(KERN_INFO "ide-tape: bug," |
1682 | " bh NULL\n"); | |
1da177e4 LT |
1683 | break; |
1684 | } | |
5a04cfa9 BP |
1685 | min = min(i, (unsigned int)(bh->b_size - |
1686 | atomic_read(&bh->b_count))); | |
1687 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1688 | 0, min); | |
1da177e4 LT |
1689 | atomic_add(min, &bh->b_count); |
1690 | i -= min; | |
1691 | bh = bh->b_reqnext; | |
1692 | } | |
1693 | } | |
1694 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
01a63aeb | 1695 | tape->merge_bh_size = 0; |
1da177e4 | 1696 | } |
077e3bdb BP |
1697 | if (tape->merge_bh != NULL) { |
1698 | ide_tape_kfree_buffer(tape); | |
1699 | tape->merge_bh = NULL; | |
1da177e4 | 1700 | } |
54abf37e | 1701 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1702 | } |
1703 | ||
83042b24 | 1704 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
1705 | { |
1706 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1707 | int bytes_read; |
1da177e4 LT |
1708 | |
1709 | /* Initialize read operation */ | |
54abf37e BP |
1710 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1711 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
d9df937a | 1712 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1713 | idetape_flush_tape_buffers(drive); |
1714 | } | |
077e3bdb | 1715 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1716 | printk(KERN_ERR "ide-tape: merge_bh_size should be" |
5a04cfa9 | 1717 | " 0 now\n"); |
01a63aeb | 1718 | tape->merge_bh_size = 0; |
1da177e4 | 1719 | } |
077e3bdb BP |
1720 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1721 | if (!tape->merge_bh) | |
1da177e4 | 1722 | return -ENOMEM; |
54abf37e | 1723 | tape->chrdev_dir = IDETAPE_DIR_READ; |
1da177e4 LT |
1724 | |
1725 | /* | |
3c98bf34 BP |
1726 | * Issue a read 0 command to ensure that DSC handshake is |
1727 | * switched from completion mode to buffer available mode. | |
1728 | * No point in issuing this if DSC overlap isn't supported, some | |
1729 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1730 | */ |
1731 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1732 | bytes_read = idetape_queue_rw_tail(drive, |
1733 | REQ_IDETAPE_READ, 0, | |
077e3bdb | 1734 | tape->merge_bh); |
1da177e4 | 1735 | if (bytes_read < 0) { |
077e3bdb BP |
1736 | ide_tape_kfree_buffer(tape); |
1737 | tape->merge_bh = NULL; | |
54abf37e | 1738 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1739 | return bytes_read; |
1740 | } | |
1741 | } | |
1742 | } | |
5e69bd95 | 1743 | |
1da177e4 LT |
1744 | return 0; |
1745 | } | |
1746 | ||
5bd50dc6 | 1747 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1748 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1749 | { |
1750 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1751 | |
8004a8c9 | 1752 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1753 | |
3c98bf34 | 1754 | /* If we are at a filemark, return a read length of 0 */ |
346331f8 | 1755 | if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
1da177e4 LT |
1756 | return 0; |
1757 | ||
83042b24 | 1758 | idetape_init_read(drive); |
5e69bd95 | 1759 | |
5e69bd95 | 1760 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
077e3bdb | 1761 | tape->merge_bh); |
1da177e4 LT |
1762 | } |
1763 | ||
5a04cfa9 | 1764 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1765 | { |
1766 | idetape_tape_t *tape = drive->driver_data; | |
1767 | struct idetape_bh *bh; | |
1768 | int blocks; | |
3c98bf34 | 1769 | |
1da177e4 LT |
1770 | while (bcount) { |
1771 | unsigned int count; | |
1772 | ||
077e3bdb | 1773 | bh = tape->merge_bh; |
f73850a3 | 1774 | count = min(tape->buffer_size, bcount); |
1da177e4 | 1775 | bcount -= count; |
54bb2074 | 1776 | blocks = count / tape->blk_size; |
1da177e4 | 1777 | while (count) { |
5a04cfa9 BP |
1778 | atomic_set(&bh->b_count, |
1779 | min(count, (unsigned int)bh->b_size)); | |
1da177e4 LT |
1780 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
1781 | count -= atomic_read(&bh->b_count); | |
1782 | bh = bh->b_reqnext; | |
1783 | } | |
5a04cfa9 | 1784 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
077e3bdb | 1785 | tape->merge_bh); |
1da177e4 LT |
1786 | } |
1787 | } | |
1788 | ||
1da177e4 | 1789 | /* |
3c98bf34 BP |
1790 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1791 | * currently support only one partition. | |
1792 | */ | |
5a04cfa9 | 1793 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 LT |
1794 | { |
1795 | int retval; | |
d236d74c | 1796 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1797 | idetape_tape_t *tape; |
1798 | tape = drive->driver_data; | |
1799 | ||
1800 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1801 | ||
1da177e4 LT |
1802 | idetape_create_rewind_cmd(drive, &pc); |
1803 | retval = idetape_queue_pc_tail(drive, &pc); | |
1804 | if (retval) | |
1805 | return retval; | |
1806 | ||
1807 | idetape_create_read_position_cmd(&pc); | |
1808 | retval = idetape_queue_pc_tail(drive, &pc); | |
1809 | if (retval) | |
1810 | return retval; | |
1811 | return 0; | |
1812 | } | |
1813 | ||
3c98bf34 | 1814 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1815 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1816 | unsigned long arg) | |
1da177e4 LT |
1817 | { |
1818 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1819 | void __user *argp = (void __user *)arg; |
1820 | ||
d59823fa BP |
1821 | struct idetape_config { |
1822 | int dsc_rw_frequency; | |
1823 | int dsc_media_access_frequency; | |
1824 | int nr_stages; | |
1825 | } config; | |
1826 | ||
8004a8c9 BP |
1827 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1828 | ||
1da177e4 | 1829 | switch (cmd) { |
5a04cfa9 BP |
1830 | case 0x0340: |
1831 | if (copy_from_user(&config, argp, sizeof(config))) | |
1832 | return -EFAULT; | |
1833 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1834 | break; |
1835 | case 0x0350: | |
1836 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1837 | config.nr_stages = 1; |
5a04cfa9 BP |
1838 | if (copy_to_user(argp, &config, sizeof(config))) |
1839 | return -EFAULT; | |
1840 | break; | |
1841 | default: | |
1842 | return -EIO; | |
1da177e4 LT |
1843 | } |
1844 | return 0; | |
1845 | } | |
1846 | ||
5a04cfa9 BP |
1847 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1848 | int mt_count) | |
1da177e4 LT |
1849 | { |
1850 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1851 | struct ide_atapi_pc pc; |
5a04cfa9 | 1852 | int retval, count = 0; |
b6422013 | 1853 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1854 | |
1855 | if (mt_count == 0) | |
1856 | return 0; | |
1857 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1858 | if (!sprev) |
1da177e4 | 1859 | return -EIO; |
5a04cfa9 | 1860 | mt_count = -mt_count; |
1da177e4 LT |
1861 | } |
1862 | ||
54abf37e | 1863 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
01a63aeb | 1864 | tape->merge_bh_size = 0; |
346331f8 | 1865 | if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
1da177e4 | 1866 | ++count; |
ec0fdb01 | 1867 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1868 | } |
1869 | ||
1da177e4 | 1870 | switch (mt_op) { |
5a04cfa9 BP |
1871 | case MTFSF: |
1872 | case MTBSF: | |
1873 | idetape_create_space_cmd(&pc, mt_count - count, | |
1874 | IDETAPE_SPACE_OVER_FILEMARK); | |
1875 | return idetape_queue_pc_tail(drive, &pc); | |
1876 | case MTFSFM: | |
1877 | case MTBSFM: | |
1878 | if (!sprev) | |
1879 | return -EIO; | |
1880 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1881 | mt_count - count); | |
1882 | if (retval) | |
1883 | return retval; | |
1884 | count = (MTBSFM == mt_op ? 1 : -1); | |
1885 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1886 | default: | |
1887 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1888 | mt_op); | |
1889 | return -EIO; | |
1da177e4 LT |
1890 | } |
1891 | } | |
1892 | ||
1da177e4 | 1893 | /* |
3c98bf34 | 1894 | * Our character device read / write functions. |
1da177e4 | 1895 | * |
3c98bf34 BP |
1896 | * The tape is optimized to maximize throughput when it is transferring an |
1897 | * integral number of the "continuous transfer limit", which is a parameter of | |
1898 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 1899 | * |
3c98bf34 BP |
1900 | * As of version 1.3 of the driver, the character device provides an abstract |
1901 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1902 | * same backup/restore procedure is supported. The driver will internally | |
1903 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1904 | * between the user's block size to the recommended size will only result in a | |
1905 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1906 | * This is not applicable to Onstream. | |
1da177e4 | 1907 | */ |
5a04cfa9 BP |
1908 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1909 | size_t count, loff_t *ppos) | |
1da177e4 LT |
1910 | { |
1911 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1912 | ide_drive_t *drive = tape->drive; | |
5a04cfa9 | 1913 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 1914 | ssize_t ret = 0; |
b6422013 | 1915 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 1916 | |
8004a8c9 | 1917 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 1918 | |
54abf37e | 1919 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
346331f8 | 1920 | if (test_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags)) |
54bb2074 BP |
1921 | if (count > tape->blk_size && |
1922 | (count % tape->blk_size) == 0) | |
1923 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 1924 | } |
83042b24 | 1925 | rc = idetape_init_read(drive); |
8d06bfad | 1926 | if (rc < 0) |
1da177e4 LT |
1927 | return rc; |
1928 | if (count == 0) | |
1929 | return (0); | |
01a63aeb BP |
1930 | if (tape->merge_bh_size) { |
1931 | actually_read = min((unsigned int)(tape->merge_bh_size), | |
5a04cfa9 | 1932 | (unsigned int)count); |
99d74e61 | 1933 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
dcd96379 | 1934 | ret = -EFAULT; |
1da177e4 | 1935 | buf += actually_read; |
01a63aeb | 1936 | tape->merge_bh_size -= actually_read; |
1da177e4 LT |
1937 | count -= actually_read; |
1938 | } | |
f73850a3 | 1939 | while (count >= tape->buffer_size) { |
b6422013 | 1940 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1941 | if (bytes_read <= 0) |
1942 | goto finish; | |
99d74e61 | 1943 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
dcd96379 | 1944 | ret = -EFAULT; |
1da177e4 LT |
1945 | buf += bytes_read; |
1946 | count -= bytes_read; | |
1947 | actually_read += bytes_read; | |
1948 | } | |
1949 | if (count) { | |
b6422013 | 1950 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
1951 | if (bytes_read <= 0) |
1952 | goto finish; | |
1953 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
99d74e61 | 1954 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
dcd96379 | 1955 | ret = -EFAULT; |
1da177e4 | 1956 | actually_read += temp; |
01a63aeb | 1957 | tape->merge_bh_size = bytes_read-temp; |
1da177e4 LT |
1958 | } |
1959 | finish: | |
346331f8 | 1960 | if (!actually_read && test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) { |
8004a8c9 BP |
1961 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
1962 | ||
1da177e4 LT |
1963 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1964 | return 0; | |
1965 | } | |
dcd96379 | 1966 | |
5a04cfa9 | 1967 | return ret ? ret : actually_read; |
1da177e4 LT |
1968 | } |
1969 | ||
5a04cfa9 | 1970 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
1971 | size_t count, loff_t *ppos) |
1972 | { | |
1973 | struct ide_tape_obj *tape = ide_tape_f(file); | |
1974 | ide_drive_t *drive = tape->drive; | |
dcd96379 DW |
1975 | ssize_t actually_written = 0; |
1976 | ssize_t ret = 0; | |
b6422013 | 1977 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
1978 | |
1979 | /* The drive is write protected. */ | |
1980 | if (tape->write_prot) | |
1981 | return -EACCES; | |
1982 | ||
8004a8c9 | 1983 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
1984 | |
1985 | /* Initialize write operation */ | |
54abf37e BP |
1986 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
1987 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 1988 | ide_tape_discard_merge_buffer(drive, 1); |
077e3bdb | 1989 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1990 | printk(KERN_ERR "ide-tape: merge_bh_size " |
1da177e4 | 1991 | "should be 0 now\n"); |
01a63aeb | 1992 | tape->merge_bh_size = 0; |
1da177e4 | 1993 | } |
077e3bdb BP |
1994 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1995 | if (!tape->merge_bh) | |
1da177e4 | 1996 | return -ENOMEM; |
54abf37e | 1997 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
077e3bdb | 1998 | idetape_init_merge_buffer(tape); |
1da177e4 LT |
1999 | |
2000 | /* | |
3c98bf34 BP |
2001 | * Issue a write 0 command to ensure that DSC handshake is |
2002 | * switched from completion mode to buffer available mode. No | |
2003 | * point in issuing this if DSC overlap isn't supported, some | |
2004 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
2005 | */ |
2006 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
2007 | ssize_t retval = idetape_queue_rw_tail(drive, |
2008 | REQ_IDETAPE_WRITE, 0, | |
077e3bdb | 2009 | tape->merge_bh); |
1da177e4 | 2010 | if (retval < 0) { |
077e3bdb BP |
2011 | ide_tape_kfree_buffer(tape); |
2012 | tape->merge_bh = NULL; | |
54abf37e | 2013 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
2014 | return retval; |
2015 | } | |
2016 | } | |
2017 | } | |
2018 | if (count == 0) | |
2019 | return (0); | |
01a63aeb BP |
2020 | if (tape->merge_bh_size) { |
2021 | if (tape->merge_bh_size >= tape->buffer_size) { | |
5a04cfa9 | 2022 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
01a63aeb | 2023 | tape->merge_bh_size = 0; |
1da177e4 | 2024 | } |
5a04cfa9 | 2025 | actually_written = min((unsigned int) |
01a63aeb | 2026 | (tape->buffer_size - tape->merge_bh_size), |
5a04cfa9 | 2027 | (unsigned int)count); |
8646c88f | 2028 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
dcd96379 | 2029 | ret = -EFAULT; |
1da177e4 | 2030 | buf += actually_written; |
01a63aeb | 2031 | tape->merge_bh_size += actually_written; |
1da177e4 LT |
2032 | count -= actually_written; |
2033 | ||
01a63aeb | 2034 | if (tape->merge_bh_size == tape->buffer_size) { |
dcd96379 | 2035 | ssize_t retval; |
01a63aeb | 2036 | tape->merge_bh_size = 0; |
b6422013 | 2037 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
2038 | if (retval <= 0) |
2039 | return (retval); | |
2040 | } | |
2041 | } | |
f73850a3 | 2042 | while (count >= tape->buffer_size) { |
dcd96379 | 2043 | ssize_t retval; |
f73850a3 | 2044 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
dcd96379 | 2045 | ret = -EFAULT; |
f73850a3 BP |
2046 | buf += tape->buffer_size; |
2047 | count -= tape->buffer_size; | |
b6422013 | 2048 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 2049 | actually_written += tape->buffer_size; |
1da177e4 LT |
2050 | if (retval <= 0) |
2051 | return (retval); | |
2052 | } | |
2053 | if (count) { | |
2054 | actually_written += count; | |
8646c88f | 2055 | if (idetape_copy_stage_from_user(tape, buf, count)) |
dcd96379 | 2056 | ret = -EFAULT; |
01a63aeb | 2057 | tape->merge_bh_size += count; |
1da177e4 | 2058 | } |
5a04cfa9 | 2059 | return ret ? ret : actually_written; |
1da177e4 LT |
2060 | } |
2061 | ||
5a04cfa9 | 2062 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 2063 | { |
d236d74c | 2064 | struct ide_atapi_pc pc; |
1da177e4 LT |
2065 | |
2066 | /* Write a filemark */ | |
2067 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
2068 | if (idetape_queue_pc_tail(drive, &pc)) { | |
2069 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); | |
2070 | return -EIO; | |
2071 | } | |
2072 | return 0; | |
2073 | } | |
2074 | ||
2075 | /* | |
d99c9da2 BP |
2076 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
2077 | * requested. | |
1da177e4 | 2078 | * |
d99c9da2 BP |
2079 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
2080 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 2081 | * usually not supported. |
1da177e4 | 2082 | * |
d99c9da2 | 2083 | * The following commands are currently not supported: |
1da177e4 | 2084 | * |
d99c9da2 BP |
2085 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
2086 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 2087 | */ |
d99c9da2 | 2088 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
2089 | { |
2090 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2091 | struct ide_atapi_pc pc; |
5a04cfa9 | 2092 | int i, retval; |
1da177e4 | 2093 | |
8004a8c9 BP |
2094 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
2095 | mt_op, mt_count); | |
5a04cfa9 | 2096 | |
1da177e4 | 2097 | switch (mt_op) { |
5a04cfa9 BP |
2098 | case MTFSF: |
2099 | case MTFSFM: | |
2100 | case MTBSF: | |
2101 | case MTBSFM: | |
2102 | if (!mt_count) | |
2103 | return 0; | |
2104 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
2105 | default: | |
2106 | break; | |
1da177e4 | 2107 | } |
5a04cfa9 | 2108 | |
1da177e4 | 2109 | switch (mt_op) { |
5a04cfa9 BP |
2110 | case MTWEOF: |
2111 | if (tape->write_prot) | |
2112 | return -EACCES; | |
ec0fdb01 | 2113 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
2114 | for (i = 0; i < mt_count; i++) { |
2115 | retval = idetape_write_filemark(drive); | |
2116 | if (retval) | |
2117 | return retval; | |
2118 | } | |
2119 | return 0; | |
2120 | case MTREW: | |
ec0fdb01 | 2121 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2122 | if (idetape_rewind_tape(drive)) |
2123 | return -EIO; | |
2124 | return 0; | |
2125 | case MTLOAD: | |
ec0fdb01 | 2126 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2127 | idetape_create_load_unload_cmd(drive, &pc, |
2128 | IDETAPE_LU_LOAD_MASK); | |
2129 | return idetape_queue_pc_tail(drive, &pc); | |
2130 | case MTUNLOAD: | |
2131 | case MTOFFL: | |
2132 | /* | |
2133 | * If door is locked, attempt to unlock before | |
2134 | * attempting to eject. | |
2135 | */ | |
2136 | if (tape->door_locked) { | |
2137 | if (idetape_create_prevent_cmd(drive, &pc, 0)) | |
2138 | if (!idetape_queue_pc_tail(drive, &pc)) | |
2139 | tape->door_locked = DOOR_UNLOCKED; | |
2140 | } | |
ec0fdb01 | 2141 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2142 | idetape_create_load_unload_cmd(drive, &pc, |
2143 | !IDETAPE_LU_LOAD_MASK); | |
2144 | retval = idetape_queue_pc_tail(drive, &pc); | |
2145 | if (!retval) | |
346331f8 | 2146 | clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); |
5a04cfa9 BP |
2147 | return retval; |
2148 | case MTNOP: | |
ec0fdb01 | 2149 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2150 | return idetape_flush_tape_buffers(drive); |
2151 | case MTRETEN: | |
ec0fdb01 | 2152 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2153 | idetape_create_load_unload_cmd(drive, &pc, |
2154 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); | |
2155 | return idetape_queue_pc_tail(drive, &pc); | |
2156 | case MTEOM: | |
2157 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
2158 | return idetape_queue_pc_tail(drive, &pc); | |
2159 | case MTERASE: | |
2160 | (void)idetape_rewind_tape(drive); | |
2161 | idetape_create_erase_cmd(&pc); | |
2162 | return idetape_queue_pc_tail(drive, &pc); | |
2163 | case MTSETBLK: | |
2164 | if (mt_count) { | |
2165 | if (mt_count < tape->blk_size || | |
2166 | mt_count % tape->blk_size) | |
1da177e4 | 2167 | return -EIO; |
5a04cfa9 | 2168 | tape->user_bs_factor = mt_count / tape->blk_size; |
346331f8 | 2169 | clear_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); |
5a04cfa9 | 2170 | } else |
346331f8 | 2171 | set_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); |
5a04cfa9 BP |
2172 | return 0; |
2173 | case MTSEEK: | |
ec0fdb01 | 2174 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2175 | return idetape_position_tape(drive, |
2176 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
2177 | case MTSETPART: | |
ec0fdb01 | 2178 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2179 | return idetape_position_tape(drive, 0, mt_count, 0); |
2180 | case MTFSR: | |
2181 | case MTBSR: | |
2182 | case MTLOCK: | |
2183 | if (!idetape_create_prevent_cmd(drive, &pc, 1)) | |
1da177e4 | 2184 | return 0; |
5a04cfa9 BP |
2185 | retval = idetape_queue_pc_tail(drive, &pc); |
2186 | if (retval) | |
1da177e4 | 2187 | return retval; |
5a04cfa9 BP |
2188 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
2189 | return 0; | |
2190 | case MTUNLOCK: | |
2191 | if (!idetape_create_prevent_cmd(drive, &pc, 0)) | |
1da177e4 | 2192 | return 0; |
5a04cfa9 BP |
2193 | retval = idetape_queue_pc_tail(drive, &pc); |
2194 | if (retval) | |
2195 | return retval; | |
2196 | tape->door_locked = DOOR_UNLOCKED; | |
2197 | return 0; | |
2198 | default: | |
2199 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
2200 | mt_op); | |
2201 | return -EIO; | |
1da177e4 LT |
2202 | } |
2203 | } | |
2204 | ||
2205 | /* | |
d99c9da2 BP |
2206 | * Our character device ioctls. General mtio.h magnetic io commands are |
2207 | * supported here, and not in the corresponding block interface. Our own | |
2208 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 2209 | */ |
d99c9da2 BP |
2210 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
2211 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
2212 | { |
2213 | struct ide_tape_obj *tape = ide_tape_f(file); | |
2214 | ide_drive_t *drive = tape->drive; | |
2215 | struct mtop mtop; | |
2216 | struct mtget mtget; | |
2217 | struct mtpos mtpos; | |
54bb2074 | 2218 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
2219 | void __user *argp = (void __user *)arg; |
2220 | ||
8004a8c9 | 2221 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 2222 | |
54abf37e | 2223 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 2224 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
2225 | idetape_flush_tape_buffers(drive); |
2226 | } | |
2227 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
01a63aeb | 2228 | block_offset = tape->merge_bh_size / |
54bb2074 | 2229 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
2230 | position = idetape_read_position(drive); |
2231 | if (position < 0) | |
1da177e4 LT |
2232 | return -EIO; |
2233 | } | |
2234 | switch (cmd) { | |
5a04cfa9 BP |
2235 | case MTIOCTOP: |
2236 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
2237 | return -EFAULT; | |
2238 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
2239 | case MTIOCGET: | |
2240 | memset(&mtget, 0, sizeof(struct mtget)); | |
2241 | mtget.mt_type = MT_ISSCSI2; | |
2242 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2243 | mtget.mt_dsreg = | |
2244 | ((tape->blk_size * tape->user_bs_factor) | |
2245 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
2246 | ||
2247 | if (tape->drv_write_prot) | |
2248 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
2249 | ||
2250 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
2251 | return -EFAULT; | |
2252 | return 0; | |
2253 | case MTIOCPOS: | |
2254 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2255 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
2256 | return -EFAULT; | |
2257 | return 0; | |
2258 | default: | |
2259 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 2260 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 2261 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
2262 | } |
2263 | } | |
2264 | ||
3cffb9ce BP |
2265 | /* |
2266 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
2267 | * block size with the reported value. | |
2268 | */ | |
2269 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
2270 | { | |
2271 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2272 | struct ide_atapi_pc pc; |
3cffb9ce BP |
2273 | |
2274 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2275 | if (idetape_queue_pc_tail(drive, &pc)) { | |
2276 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); | |
54bb2074 | 2277 | if (tape->blk_size == 0) { |
3cffb9ce BP |
2278 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
2279 | "block size, assuming 32k\n"); | |
54bb2074 | 2280 | tape->blk_size = 32768; |
3cffb9ce BP |
2281 | } |
2282 | return; | |
2283 | } | |
d236d74c BP |
2284 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
2285 | (pc.buf[4 + 6] << 8) + | |
2286 | pc.buf[4 + 7]; | |
2287 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 2288 | } |
1da177e4 | 2289 | |
5a04cfa9 | 2290 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
2291 | { |
2292 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
2293 | ide_drive_t *drive; | |
2294 | idetape_tape_t *tape; | |
d236d74c | 2295 | struct ide_atapi_pc pc; |
1da177e4 LT |
2296 | int retval; |
2297 | ||
8004a8c9 BP |
2298 | if (i >= MAX_HWIFS * MAX_DRIVES) |
2299 | return -ENXIO; | |
2300 | ||
2301 | tape = ide_tape_chrdev_get(i); | |
2302 | if (!tape) | |
2303 | return -ENXIO; | |
2304 | ||
2305 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
2306 | ||
1da177e4 LT |
2307 | /* |
2308 | * We really want to do nonseekable_open(inode, filp); here, but some | |
2309 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
2310 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
2311 | */ | |
2312 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
2313 | ||
1da177e4 LT |
2314 | drive = tape->drive; |
2315 | ||
2316 | filp->private_data = tape; | |
2317 | ||
346331f8 | 2318 | if (test_and_set_bit(IDETAPE_FLAG_BUSY, &tape->flags)) { |
1da177e4 LT |
2319 | retval = -EBUSY; |
2320 | goto out_put_tape; | |
2321 | } | |
2322 | ||
2323 | retval = idetape_wait_ready(drive, 60 * HZ); | |
2324 | if (retval) { | |
346331f8 | 2325 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
1da177e4 LT |
2326 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
2327 | goto out_put_tape; | |
2328 | } | |
2329 | ||
2330 | idetape_read_position(drive); | |
346331f8 | 2331 | if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags)) |
1da177e4 LT |
2332 | (void)idetape_rewind_tape(drive); |
2333 | ||
1da177e4 | 2334 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 2335 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
2336 | |
2337 | /* Set write protect flag if device is opened as read-only. */ | |
2338 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
2339 | tape->write_prot = 1; | |
2340 | else | |
2341 | tape->write_prot = tape->drv_write_prot; | |
2342 | ||
2343 | /* Make sure drive isn't write protected if user wants to write. */ | |
2344 | if (tape->write_prot) { | |
2345 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
2346 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
346331f8 | 2347 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
1da177e4 LT |
2348 | retval = -EROFS; |
2349 | goto out_put_tape; | |
2350 | } | |
2351 | } | |
2352 | ||
3c98bf34 | 2353 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 2354 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 LT |
2355 | if (idetape_create_prevent_cmd(drive, &pc, 1)) { |
2356 | if (!idetape_queue_pc_tail(drive, &pc)) { | |
2357 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) | |
2358 | tape->door_locked = DOOR_LOCKED; | |
2359 | } | |
2360 | } | |
2361 | } | |
1da177e4 LT |
2362 | return 0; |
2363 | ||
2364 | out_put_tape: | |
2365 | ide_tape_put(tape); | |
2366 | return retval; | |
2367 | } | |
2368 | ||
5a04cfa9 | 2369 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
2370 | { |
2371 | idetape_tape_t *tape = drive->driver_data; | |
2372 | ||
d9df937a | 2373 | ide_tape_flush_merge_buffer(drive); |
077e3bdb BP |
2374 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); |
2375 | if (tape->merge_bh != NULL) { | |
54bb2074 BP |
2376 | idetape_pad_zeros(drive, tape->blk_size * |
2377 | (tape->user_bs_factor - 1)); | |
077e3bdb BP |
2378 | ide_tape_kfree_buffer(tape); |
2379 | tape->merge_bh = NULL; | |
1da177e4 LT |
2380 | } |
2381 | idetape_write_filemark(drive); | |
2382 | idetape_flush_tape_buffers(drive); | |
2383 | idetape_flush_tape_buffers(drive); | |
2384 | } | |
2385 | ||
5a04cfa9 | 2386 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 LT |
2387 | { |
2388 | struct ide_tape_obj *tape = ide_tape_f(filp); | |
2389 | ide_drive_t *drive = tape->drive; | |
d236d74c | 2390 | struct ide_atapi_pc pc; |
1da177e4 LT |
2391 | unsigned int minor = iminor(inode); |
2392 | ||
2393 | lock_kernel(); | |
2394 | tape = drive->driver_data; | |
8004a8c9 BP |
2395 | |
2396 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 2397 | |
54abf37e | 2398 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 2399 | idetape_write_release(drive, minor); |
54abf37e | 2400 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 2401 | if (minor < 128) |
ec0fdb01 | 2402 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 2403 | } |
f64eee7b | 2404 | |
346331f8 | 2405 | if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags)) |
1da177e4 | 2406 | (void) idetape_rewind_tape(drive); |
54abf37e | 2407 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 LT |
2408 | if (tape->door_locked == DOOR_LOCKED) { |
2409 | if (idetape_create_prevent_cmd(drive, &pc, 0)) { | |
2410 | if (!idetape_queue_pc_tail(drive, &pc)) | |
2411 | tape->door_locked = DOOR_UNLOCKED; | |
2412 | } | |
2413 | } | |
2414 | } | |
346331f8 | 2415 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
1da177e4 LT |
2416 | ide_tape_put(tape); |
2417 | unlock_kernel(); | |
2418 | return 0; | |
2419 | } | |
2420 | ||
2421 | /* | |
71071b8e | 2422 | * check the contents of the ATAPI IDENTIFY command results. We return: |
1da177e4 | 2423 | * |
71071b8e BP |
2424 | * 1 - If the tape can be supported by us, based on the information we have so |
2425 | * far. | |
1da177e4 | 2426 | * |
71071b8e | 2427 | * 0 - If this tape driver is not currently supported by us. |
1da177e4 | 2428 | */ |
71071b8e | 2429 | static int idetape_identify_device(ide_drive_t *drive) |
1da177e4 | 2430 | { |
71071b8e | 2431 | u8 gcw[2], protocol, device_type, removable, packet_size; |
1da177e4 LT |
2432 | |
2433 | if (drive->id_read == 0) | |
2434 | return 1; | |
2435 | ||
71071b8e | 2436 | *((unsigned short *) &gcw) = drive->id->config; |
1da177e4 | 2437 | |
71071b8e BP |
2438 | protocol = (gcw[1] & 0xC0) >> 6; |
2439 | device_type = gcw[1] & 0x1F; | |
2440 | removable = !!(gcw[0] & 0x80); | |
2441 | packet_size = gcw[0] & 0x3; | |
1da177e4 | 2442 | |
71071b8e BP |
2443 | /* Check that we can support this device */ |
2444 | if (protocol != 2) | |
16422de3 | 2445 | printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n", |
71071b8e BP |
2446 | protocol); |
2447 | else if (device_type != 1) | |
16422de3 | 2448 | printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set " |
71071b8e BP |
2449 | "to tape\n", device_type); |
2450 | else if (!removable) | |
1da177e4 | 2451 | printk(KERN_ERR "ide-tape: The removable flag is not set\n"); |
71071b8e | 2452 | else if (packet_size != 0) { |
24d57f8b BP |
2453 | printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12" |
2454 | " bytes\n", packet_size); | |
1da177e4 LT |
2455 | } else |
2456 | return 1; | |
2457 | return 0; | |
2458 | } | |
2459 | ||
6d29c8f0 | 2460 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 2461 | { |
1da177e4 | 2462 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 2463 | struct ide_atapi_pc pc; |
41f81d54 | 2464 | char fw_rev[6], vendor_id[10], product_id[18]; |
6d29c8f0 | 2465 | |
1da177e4 LT |
2466 | idetape_create_inquiry_cmd(&pc); |
2467 | if (idetape_queue_pc_tail(drive, &pc)) { | |
6d29c8f0 BP |
2468 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
2469 | tape->name); | |
1da177e4 LT |
2470 | return; |
2471 | } | |
d236d74c BP |
2472 | memcpy(vendor_id, &pc.buf[8], 8); |
2473 | memcpy(product_id, &pc.buf[16], 16); | |
2474 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 BP |
2475 | |
2476 | ide_fixstring(vendor_id, 10, 0); | |
2477 | ide_fixstring(product_id, 18, 0); | |
2478 | ide_fixstring(fw_rev, 6, 0); | |
2479 | ||
6d29c8f0 | 2480 | printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", |
41f81d54 | 2481 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
2482 | } |
2483 | ||
2484 | /* | |
b6422013 BP |
2485 | * Ask the tape about its various parameters. In particular, we will adjust our |
2486 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 2487 | */ |
5a04cfa9 | 2488 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
2489 | { |
2490 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2491 | struct ide_atapi_pc pc; |
b6422013 BP |
2492 | u8 *caps; |
2493 | u8 speed, max_speed; | |
47314fa4 | 2494 | |
1da177e4 LT |
2495 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2496 | if (idetape_queue_pc_tail(drive, &pc)) { | |
b6422013 BP |
2497 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
2498 | " some default values\n"); | |
54bb2074 | 2499 | tape->blk_size = 512; |
b6422013 BP |
2500 | put_unaligned(52, (u16 *)&tape->caps[12]); |
2501 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2502 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
2503 | return; |
2504 | } | |
d236d74c | 2505 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
2506 | |
2507 | /* convert to host order and save for later use */ | |
2508 | speed = be16_to_cpu(*(u16 *)&caps[14]); | |
2509 | max_speed = be16_to_cpu(*(u16 *)&caps[8]); | |
1da177e4 | 2510 | |
b6422013 BP |
2511 | put_unaligned(max_speed, (u16 *)&caps[8]); |
2512 | put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]); | |
2513 | put_unaligned(speed, (u16 *)&caps[14]); | |
2514 | put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]); | |
1da177e4 | 2515 | |
b6422013 BP |
2516 | if (!speed) { |
2517 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2518 | "(assuming 650KB/sec)\n", drive->name); | |
2519 | put_unaligned(650, (u16 *)&caps[14]); | |
1da177e4 | 2520 | } |
b6422013 BP |
2521 | if (!max_speed) { |
2522 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2523 | "(assuming 650KB/sec)\n", drive->name); | |
2524 | put_unaligned(650, (u16 *)&caps[8]); | |
1da177e4 LT |
2525 | } |
2526 | ||
b6422013 BP |
2527 | memcpy(&tape->caps, caps, 20); |
2528 | if (caps[7] & 0x02) | |
54bb2074 | 2529 | tape->blk_size = 512; |
b6422013 | 2530 | else if (caps[7] & 0x04) |
54bb2074 | 2531 | tape->blk_size = 1024; |
1da177e4 LT |
2532 | } |
2533 | ||
7662d046 | 2534 | #ifdef CONFIG_IDE_PROC_FS |
5a04cfa9 | 2535 | static void idetape_add_settings(ide_drive_t *drive) |
1da177e4 LT |
2536 | { |
2537 | idetape_tape_t *tape = drive->driver_data; | |
2538 | ||
b6422013 BP |
2539 | ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
2540 | 1, 2, (u16 *)&tape->caps[16], NULL); | |
b6422013 BP |
2541 | ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
2542 | 1, 1, (u16 *)&tape->caps[14], NULL); | |
f73850a3 BP |
2543 | ide_add_setting(drive, "buffer_size", SETTING_READ, TYPE_INT, 0, 0xffff, |
2544 | 1, 1024, &tape->buffer_size, NULL); | |
54bb2074 BP |
2545 | ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, |
2546 | IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq, | |
2547 | NULL); | |
5a04cfa9 BP |
2548 | ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, |
2549 | 1, &drive->dsc_overlap, NULL); | |
5a04cfa9 BP |
2550 | ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, |
2551 | 1, 1, &tape->avg_speed, NULL); | |
8004a8c9 BP |
2552 | ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1, |
2553 | 1, &tape->debug_mask, NULL); | |
1da177e4 | 2554 | } |
7662d046 BZ |
2555 | #else |
2556 | static inline void idetape_add_settings(ide_drive_t *drive) { ; } | |
2557 | #endif | |
1da177e4 LT |
2558 | |
2559 | /* | |
3c98bf34 | 2560 | * The function below is called to: |
1da177e4 | 2561 | * |
3c98bf34 BP |
2562 | * 1. Initialize our various state variables. |
2563 | * 2. Ask the tape for its capabilities. | |
2564 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2565 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 2566 | * |
3c98bf34 BP |
2567 | * Note that at this point ide.c already assigned us an irq, so that we can |
2568 | * queue requests here and wait for their completion. | |
1da177e4 | 2569 | */ |
5a04cfa9 | 2570 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 2571 | { |
83042b24 | 2572 | unsigned long t; |
1da177e4 | 2573 | int speed; |
f73850a3 | 2574 | int buffer_size; |
71071b8e | 2575 | u8 gcw[2]; |
b6422013 | 2576 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 2577 | |
54bb2074 | 2578 | spin_lock_init(&tape->lock); |
1da177e4 | 2579 | drive->dsc_overlap = 1; |
4166c199 BZ |
2580 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
2581 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2582 | tape->name); | |
2583 | drive->dsc_overlap = 0; | |
1da177e4 | 2584 | } |
1da177e4 LT |
2585 | /* Seagate Travan drives do not support DSC overlap. */ |
2586 | if (strstr(drive->id->model, "Seagate STT3401")) | |
2587 | drive->dsc_overlap = 0; | |
2588 | tape->minor = minor; | |
2589 | tape->name[0] = 'h'; | |
2590 | tape->name[1] = 't'; | |
2591 | tape->name[2] = '0' + minor; | |
54abf37e | 2592 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 | 2593 | tape->pc = tape->pc_stack; |
1da177e4 | 2594 | *((unsigned short *) &gcw) = drive->id->config; |
71071b8e BP |
2595 | |
2596 | /* Command packet DRQ type */ | |
2597 | if (((gcw[0] & 0x60) >> 5) == 1) | |
346331f8 | 2598 | set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags); |
1da177e4 | 2599 | |
1da177e4 LT |
2600 | idetape_get_inquiry_results(drive); |
2601 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 2602 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 2603 | tape->user_bs_factor = 1; |
f73850a3 BP |
2604 | tape->buffer_size = *ctl * tape->blk_size; |
2605 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 2606 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 2607 | *ctl /= 2; |
f73850a3 | 2608 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 2609 | } |
f73850a3 | 2610 | buffer_size = tape->buffer_size; |
a997a435 | 2611 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
f73850a3 | 2612 | if (buffer_size % PAGE_SIZE) { |
a997a435 | 2613 | tape->pages_per_buffer++; |
f73850a3 | 2614 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
1da177e4 LT |
2615 | } |
2616 | ||
83042b24 | 2617 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 2618 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 2619 | |
f73850a3 | 2620 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
2621 | |
2622 | /* | |
3c98bf34 BP |
2623 | * Ensure that the number we got makes sense; limit it within |
2624 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 2625 | */ |
a792bd5a HH |
2626 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
2627 | IDETAPE_DSC_RW_MAX); | |
1da177e4 | 2628 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 2629 | "%lums tDSC%s\n", |
b6422013 | 2630 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
2631 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
2632 | tape->buffer_size / 1024, | |
54bb2074 | 2633 | tape->best_dsc_rw_freq * 1000 / HZ, |
1da177e4 LT |
2634 | drive->using_dma ? ", DMA":""); |
2635 | ||
2636 | idetape_add_settings(drive); | |
2637 | } | |
2638 | ||
4031bbe4 | 2639 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
2640 | { |
2641 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 2642 | |
7662d046 | 2643 | ide_proc_unregister_driver(drive, tape->driver); |
1da177e4 LT |
2644 | |
2645 | ide_unregister_region(tape->disk); | |
2646 | ||
2647 | ide_tape_put(tape); | |
1da177e4 LT |
2648 | } |
2649 | ||
2650 | static void ide_tape_release(struct kref *kref) | |
2651 | { | |
2652 | struct ide_tape_obj *tape = to_ide_tape(kref); | |
2653 | ide_drive_t *drive = tape->drive; | |
2654 | struct gendisk *g = tape->disk; | |
2655 | ||
01a63aeb | 2656 | BUG_ON(tape->merge_bh_size); |
8604affd | 2657 | |
1da177e4 LT |
2658 | drive->dsc_overlap = 0; |
2659 | drive->driver_data = NULL; | |
dbc1272e | 2660 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
2661 | device_destroy(idetape_sysfs_class, |
2662 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
2663 | idetape_devs[tape->minor] = NULL; |
2664 | g->private_data = NULL; | |
2665 | put_disk(g); | |
2666 | kfree(tape); | |
2667 | } | |
2668 | ||
ecfd80e4 | 2669 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
2670 | static int proc_idetape_read_name |
2671 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2672 | { | |
2673 | ide_drive_t *drive = (ide_drive_t *) data; | |
2674 | idetape_tape_t *tape = drive->driver_data; | |
2675 | char *out = page; | |
2676 | int len; | |
2677 | ||
2678 | len = sprintf(out, "%s\n", tape->name); | |
2679 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2680 | } | |
2681 | ||
2682 | static ide_proc_entry_t idetape_proc[] = { | |
2683 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2684 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2685 | { NULL, 0, NULL, NULL } | |
2686 | }; | |
1da177e4 LT |
2687 | #endif |
2688 | ||
4031bbe4 | 2689 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 2690 | |
1da177e4 | 2691 | static ide_driver_t idetape_driver = { |
8604affd | 2692 | .gen_driver = { |
4ef3b8f4 | 2693 | .owner = THIS_MODULE, |
8604affd BZ |
2694 | .name = "ide-tape", |
2695 | .bus = &ide_bus_type, | |
8604affd | 2696 | }, |
4031bbe4 RK |
2697 | .probe = ide_tape_probe, |
2698 | .remove = ide_tape_remove, | |
1da177e4 LT |
2699 | .version = IDETAPE_VERSION, |
2700 | .media = ide_tape, | |
1da177e4 | 2701 | .supports_dsc_overlap = 1, |
1da177e4 LT |
2702 | .do_request = idetape_do_request, |
2703 | .end_request = idetape_end_request, | |
2704 | .error = __ide_error, | |
2705 | .abort = __ide_abort, | |
7662d046 | 2706 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 | 2707 | .proc = idetape_proc, |
7662d046 | 2708 | #endif |
1da177e4 LT |
2709 | }; |
2710 | ||
3c98bf34 | 2711 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 2712 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
2713 | .owner = THIS_MODULE, |
2714 | .read = idetape_chrdev_read, | |
2715 | .write = idetape_chrdev_write, | |
2716 | .ioctl = idetape_chrdev_ioctl, | |
2717 | .open = idetape_chrdev_open, | |
2718 | .release = idetape_chrdev_release, | |
2719 | }; | |
2720 | ||
2721 | static int idetape_open(struct inode *inode, struct file *filp) | |
2722 | { | |
2723 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2724 | struct ide_tape_obj *tape; | |
1da177e4 | 2725 | |
5a04cfa9 BP |
2726 | tape = ide_tape_get(disk); |
2727 | if (!tape) | |
1da177e4 LT |
2728 | return -ENXIO; |
2729 | ||
1da177e4 LT |
2730 | return 0; |
2731 | } | |
2732 | ||
2733 | static int idetape_release(struct inode *inode, struct file *filp) | |
2734 | { | |
2735 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2736 | struct ide_tape_obj *tape = ide_tape_g(disk); | |
1da177e4 LT |
2737 | |
2738 | ide_tape_put(tape); | |
2739 | ||
2740 | return 0; | |
2741 | } | |
2742 | ||
2743 | static int idetape_ioctl(struct inode *inode, struct file *file, | |
2744 | unsigned int cmd, unsigned long arg) | |
2745 | { | |
2746 | struct block_device *bdev = inode->i_bdev; | |
2747 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); | |
2748 | ide_drive_t *drive = tape->drive; | |
2749 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); | |
2750 | if (err == -EINVAL) | |
2751 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2752 | return err; | |
2753 | } | |
2754 | ||
2755 | static struct block_device_operations idetape_block_ops = { | |
2756 | .owner = THIS_MODULE, | |
2757 | .open = idetape_open, | |
2758 | .release = idetape_release, | |
2759 | .ioctl = idetape_ioctl, | |
2760 | }; | |
2761 | ||
4031bbe4 | 2762 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2763 | { |
2764 | idetape_tape_t *tape; | |
2765 | struct gendisk *g; | |
2766 | int minor; | |
2767 | ||
2768 | if (!strstr("ide-tape", drive->driver_req)) | |
2769 | goto failed; | |
2770 | if (!drive->present) | |
2771 | goto failed; | |
2772 | if (drive->media != ide_tape) | |
2773 | goto failed; | |
5a04cfa9 BP |
2774 | if (!idetape_identify_device(drive)) { |
2775 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" | |
2776 | " the driver\n", drive->name); | |
1da177e4 LT |
2777 | goto failed; |
2778 | } | |
5a04cfa9 | 2779 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2780 | if (tape == NULL) { |
5a04cfa9 BP |
2781 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2782 | drive->name); | |
1da177e4 LT |
2783 | goto failed; |
2784 | } | |
2785 | ||
2786 | g = alloc_disk(1 << PARTN_BITS); | |
2787 | if (!g) | |
2788 | goto out_free_tape; | |
2789 | ||
2790 | ide_init_disk(g, drive); | |
2791 | ||
7662d046 | 2792 | ide_proc_register_driver(drive, &idetape_driver); |
1da177e4 | 2793 | |
1da177e4 LT |
2794 | kref_init(&tape->kref); |
2795 | ||
2796 | tape->drive = drive; | |
2797 | tape->driver = &idetape_driver; | |
2798 | tape->disk = g; | |
2799 | ||
2800 | g->private_data = &tape->driver; | |
2801 | ||
2802 | drive->driver_data = tape; | |
2803 | ||
cf8b8975 | 2804 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2805 | for (minor = 0; idetape_devs[minor]; minor++) |
2806 | ; | |
2807 | idetape_devs[minor] = tape; | |
cf8b8975 | 2808 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2809 | |
2810 | idetape_setup(drive, tape, minor); | |
2811 | ||
dbc1272e TJ |
2812 | device_create(idetape_sysfs_class, &drive->gendev, |
2813 | MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); | |
2814 | device_create(idetape_sysfs_class, &drive->gendev, | |
2815 | MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); | |
d5dee80a | 2816 | |
1da177e4 LT |
2817 | g->fops = &idetape_block_ops; |
2818 | ide_register_region(g); | |
2819 | ||
2820 | return 0; | |
8604affd | 2821 | |
1da177e4 LT |
2822 | out_free_tape: |
2823 | kfree(tape); | |
2824 | failed: | |
8604affd | 2825 | return -ENODEV; |
1da177e4 LT |
2826 | } |
2827 | ||
5a04cfa9 | 2828 | static void __exit idetape_exit(void) |
1da177e4 | 2829 | { |
8604affd | 2830 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2831 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2832 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2833 | } | |
2834 | ||
17514e8a | 2835 | static int __init idetape_init(void) |
1da177e4 | 2836 | { |
d5dee80a WD |
2837 | int error = 1; |
2838 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2839 | if (IS_ERR(idetape_sysfs_class)) { | |
2840 | idetape_sysfs_class = NULL; | |
2841 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2842 | error = -EBUSY; | |
2843 | goto out; | |
2844 | } | |
2845 | ||
1da177e4 | 2846 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2847 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2848 | " interface\n"); | |
d5dee80a WD |
2849 | error = -EBUSY; |
2850 | goto out_free_class; | |
1da177e4 | 2851 | } |
d5dee80a WD |
2852 | |
2853 | error = driver_register(&idetape_driver.gen_driver); | |
2854 | if (error) | |
2855 | goto out_free_driver; | |
2856 | ||
2857 | return 0; | |
2858 | ||
2859 | out_free_driver: | |
2860 | driver_unregister(&idetape_driver.gen_driver); | |
2861 | out_free_class: | |
2862 | class_destroy(idetape_sysfs_class); | |
2863 | out: | |
2864 | return error; | |
1da177e4 LT |
2865 | } |
2866 | ||
263756ec | 2867 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2868 | module_init(idetape_init); |
2869 | module_exit(idetape_exit); | |
2870 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
2871 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2872 | MODULE_LICENSE("GPL"); |