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 | ||
3c98bf34 | 147 | /* Read/Write error simulation */ |
1da177e4 LT |
148 | #define SIMULATE_ERRORS 0 |
149 | ||
54abf37e BP |
150 | /* tape directions */ |
151 | enum { | |
152 | IDETAPE_DIR_NONE = (1 << 0), | |
153 | IDETAPE_DIR_READ = (1 << 1), | |
154 | IDETAPE_DIR_WRITE = (1 << 2), | |
155 | }; | |
1da177e4 LT |
156 | |
157 | struct idetape_bh { | |
ab057968 | 158 | u32 b_size; |
1da177e4 LT |
159 | atomic_t b_count; |
160 | struct idetape_bh *b_reqnext; | |
161 | char *b_data; | |
162 | }; | |
163 | ||
03056b90 BP |
164 | /* Tape door status */ |
165 | #define DOOR_UNLOCKED 0 | |
166 | #define DOOR_LOCKED 1 | |
167 | #define DOOR_EXPLICITLY_LOCKED 2 | |
168 | ||
169 | /* Some defines for the SPACE command */ | |
170 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
171 | #define IDETAPE_SPACE_TO_EOD 3 | |
172 | ||
173 | /* Some defines for the LOAD UNLOAD command */ | |
174 | #define IDETAPE_LU_LOAD_MASK 1 | |
175 | #define IDETAPE_LU_RETENSION_MASK 2 | |
176 | #define IDETAPE_LU_EOT_MASK 4 | |
177 | ||
178 | /* | |
179 | * Special requests for our block device strategy routine. | |
180 | * | |
181 | * In order to service a character device command, we add special requests to | |
182 | * the tail of our block device request queue and wait for their completion. | |
183 | */ | |
184 | ||
185 | enum { | |
186 | REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ | |
187 | REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ | |
188 | REQ_IDETAPE_READ = (1 << 2), | |
189 | REQ_IDETAPE_WRITE = (1 << 3), | |
190 | }; | |
191 | ||
192 | /* Error codes returned in rq->errors to the higher part of the driver. */ | |
193 | #define IDETAPE_ERROR_GENERAL 101 | |
194 | #define IDETAPE_ERROR_FILEMARK 102 | |
195 | #define IDETAPE_ERROR_EOD 103 | |
196 | ||
197 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ | |
198 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
199 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
200 | ||
346331f8 BP |
201 | /* Tape flag bits values. */ |
202 | enum { | |
203 | IDETAPE_FLAG_IGNORE_DSC = (1 << 0), | |
204 | /* 0 When the tape position is unknown */ | |
205 | IDETAPE_FLAG_ADDRESS_VALID = (1 << 1), | |
206 | /* Device already opened */ | |
42d54689 | 207 | IDETAPE_FLAG_BUSY = (1 << 2), |
346331f8 | 208 | /* Attempt to auto-detect the current user block size */ |
42d54689 | 209 | IDETAPE_FLAG_DETECT_BS = (1 << 3), |
346331f8 | 210 | /* Currently on a filemark */ |
42d54689 | 211 | IDETAPE_FLAG_FILEMARK = (1 << 4), |
346331f8 | 212 | /* DRQ interrupt device */ |
42d54689 | 213 | IDETAPE_FLAG_DRQ_INTERRUPT = (1 << 5), |
346331f8 | 214 | /* 0 = no tape is loaded, so we don't rewind after ejecting */ |
42d54689 | 215 | IDETAPE_FLAG_MEDIUM_PRESENT = (1 << 6), |
346331f8 BP |
216 | }; |
217 | ||
3c98bf34 | 218 | /* A pipeline stage. */ |
1da177e4 LT |
219 | typedef struct idetape_stage_s { |
220 | struct request rq; /* The corresponding request */ | |
221 | struct idetape_bh *bh; /* The data buffers */ | |
222 | struct idetape_stage_s *next; /* Pointer to the next stage */ | |
223 | } idetape_stage_t; | |
224 | ||
1da177e4 | 225 | /* |
3c98bf34 BP |
226 | * Most of our global data which we need to save even as we leave the driver due |
227 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
228 | */ |
229 | typedef struct ide_tape_obj { | |
230 | ide_drive_t *drive; | |
231 | ide_driver_t *driver; | |
232 | struct gendisk *disk; | |
233 | struct kref kref; | |
234 | ||
235 | /* | |
236 | * Since a typical character device operation requires more | |
237 | * than one packet command, we provide here enough memory | |
238 | * for the maximum of interconnected packet commands. | |
239 | * The packet commands are stored in the circular array pc_stack. | |
240 | * pc_stack_index points to the last used entry, and warps around | |
241 | * to the start when we get to the last array entry. | |
242 | * | |
243 | * pc points to the current processed packet command. | |
244 | * | |
245 | * failed_pc points to the last failed packet command, or contains | |
246 | * NULL if we do not need to retry any packet command. This is | |
247 | * required since an additional packet command is needed before the | |
248 | * retry, to get detailed information on what went wrong. | |
249 | */ | |
250 | /* Current packet command */ | |
d236d74c | 251 | struct ide_atapi_pc *pc; |
1da177e4 | 252 | /* Last failed packet command */ |
d236d74c | 253 | struct ide_atapi_pc *failed_pc; |
1da177e4 | 254 | /* Packet command stack */ |
d236d74c | 255 | struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK]; |
1da177e4 LT |
256 | /* Next free packet command storage space */ |
257 | int pc_stack_index; | |
258 | struct request rq_stack[IDETAPE_PC_STACK]; | |
259 | /* We implement a circular array */ | |
260 | int rq_stack_index; | |
261 | ||
262 | /* | |
3c98bf34 | 263 | * DSC polling variables. |
1da177e4 | 264 | * |
3c98bf34 BP |
265 | * While polling for DSC we use postponed_rq to postpone the current |
266 | * request so that ide.c will be able to service pending requests on the | |
267 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 268 | * data transfer) request in the device request queue. |
1da177e4 LT |
269 | */ |
270 | struct request *postponed_rq; | |
271 | /* The time in which we started polling for DSC */ | |
272 | unsigned long dsc_polling_start; | |
273 | /* Timer used to poll for dsc */ | |
274 | struct timer_list dsc_timer; | |
275 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
276 | unsigned long best_dsc_rw_freq; |
277 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
278 | unsigned long dsc_timeout; |
279 | ||
3c98bf34 | 280 | /* Read position information */ |
1da177e4 LT |
281 | u8 partition; |
282 | /* Current block */ | |
54bb2074 | 283 | unsigned int first_frame; |
1da177e4 | 284 | |
3c98bf34 | 285 | /* Last error information */ |
1da177e4 LT |
286 | u8 sense_key, asc, ascq; |
287 | ||
3c98bf34 | 288 | /* Character device operation */ |
1da177e4 LT |
289 | unsigned int minor; |
290 | /* device name */ | |
291 | char name[4]; | |
292 | /* Current character device data transfer direction */ | |
54abf37e | 293 | u8 chrdev_dir; |
1da177e4 | 294 | |
54bb2074 BP |
295 | /* tape block size, usually 512 or 1024 bytes */ |
296 | unsigned short blk_size; | |
1da177e4 | 297 | int user_bs_factor; |
b6422013 | 298 | |
1da177e4 | 299 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 300 | u8 caps[20]; |
1da177e4 LT |
301 | |
302 | /* | |
3c98bf34 | 303 | * Active data transfer request parameters. |
1da177e4 | 304 | * |
3c98bf34 BP |
305 | * At most, there is only one ide-tape originated data transfer request |
306 | * in the device request queue. This allows ide.c to easily service | |
307 | * requests from the other device when we postpone our active request. | |
1da177e4 | 308 | */ |
83042b24 | 309 | |
3c98bf34 | 310 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 311 | int buffer_size; |
1da177e4 LT |
312 | idetape_stage_t *merge_stage; |
313 | int merge_stage_size; | |
314 | struct idetape_bh *bh; | |
315 | char *b_data; | |
316 | int b_count; | |
3c98bf34 | 317 | |
a997a435 | 318 | int pages_per_buffer; |
1da177e4 LT |
319 | /* Wasted space in each stage */ |
320 | int excess_bh_size; | |
321 | ||
322 | /* Status/Action flags: long for set_bit */ | |
323 | unsigned long flags; | |
324 | /* protects the ide-tape queue */ | |
54bb2074 | 325 | spinlock_t lock; |
1da177e4 | 326 | |
3c98bf34 | 327 | /* Measures average tape speed */ |
1da177e4 LT |
328 | unsigned long avg_time; |
329 | int avg_size; | |
330 | int avg_speed; | |
331 | ||
1da177e4 LT |
332 | /* the door is currently locked */ |
333 | int door_locked; | |
334 | /* the tape hardware is write protected */ | |
335 | char drv_write_prot; | |
336 | /* the tape is write protected (hardware or opened as read-only) */ | |
337 | char write_prot; | |
338 | ||
8004a8c9 | 339 | u32 debug_mask; |
1da177e4 LT |
340 | } idetape_tape_t; |
341 | ||
cf8b8975 | 342 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 343 | |
d5dee80a WD |
344 | static struct class *idetape_sysfs_class; |
345 | ||
1da177e4 LT |
346 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
347 | ||
348 | #define ide_tape_g(disk) \ | |
349 | container_of((disk)->private_data, struct ide_tape_obj, driver) | |
350 | ||
351 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) | |
352 | { | |
353 | struct ide_tape_obj *tape = NULL; | |
354 | ||
cf8b8975 | 355 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
356 | tape = ide_tape_g(disk); |
357 | if (tape) | |
358 | kref_get(&tape->kref); | |
cf8b8975 | 359 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
360 | return tape; |
361 | } | |
362 | ||
363 | static void ide_tape_release(struct kref *); | |
364 | ||
365 | static void ide_tape_put(struct ide_tape_obj *tape) | |
366 | { | |
cf8b8975 | 367 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 368 | kref_put(&tape->kref, ide_tape_release); |
cf8b8975 | 369 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
370 | } |
371 | ||
1da177e4 | 372 | /* |
3c98bf34 BP |
373 | * The variables below are used for the character device interface. Additional |
374 | * state variables are defined in our ide_drive_t structure. | |
1da177e4 | 375 | */ |
5a04cfa9 | 376 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
1da177e4 LT |
377 | |
378 | #define ide_tape_f(file) ((file)->private_data) | |
379 | ||
380 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) | |
381 | { | |
382 | struct ide_tape_obj *tape = NULL; | |
383 | ||
cf8b8975 | 384 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
385 | tape = idetape_devs[i]; |
386 | if (tape) | |
387 | kref_get(&tape->kref); | |
cf8b8975 | 388 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
389 | return tape; |
390 | } | |
391 | ||
d236d74c | 392 | static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 393 | unsigned int bcount) |
1da177e4 LT |
394 | { |
395 | struct idetape_bh *bh = pc->bh; | |
396 | int count; | |
397 | ||
398 | while (bcount) { | |
1da177e4 LT |
399 | if (bh == NULL) { |
400 | printk(KERN_ERR "ide-tape: bh == NULL in " | |
401 | "idetape_input_buffers\n"); | |
7616c0ad | 402 | ide_atapi_discard_data(drive, bcount); |
1da177e4 LT |
403 | return; |
404 | } | |
5a04cfa9 BP |
405 | count = min( |
406 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
407 | bcount); | |
408 | HWIF(drive)->atapi_input_bytes(drive, bh->b_data + | |
409 | atomic_read(&bh->b_count), count); | |
1da177e4 LT |
410 | bcount -= count; |
411 | atomic_add(count, &bh->b_count); | |
412 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
413 | bh = bh->b_reqnext; | |
414 | if (bh) | |
415 | atomic_set(&bh->b_count, 0); | |
416 | } | |
417 | } | |
418 | pc->bh = bh; | |
419 | } | |
420 | ||
d236d74c | 421 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 422 | unsigned int bcount) |
1da177e4 LT |
423 | { |
424 | struct idetape_bh *bh = pc->bh; | |
425 | int count; | |
426 | ||
427 | while (bcount) { | |
1da177e4 | 428 | if (bh == NULL) { |
5a04cfa9 BP |
429 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
430 | __func__); | |
1da177e4 LT |
431 | return; |
432 | } | |
1da177e4 LT |
433 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
434 | HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count); | |
435 | bcount -= count; | |
436 | pc->b_data += count; | |
437 | pc->b_count -= count; | |
438 | if (!pc->b_count) { | |
5a04cfa9 BP |
439 | bh = bh->b_reqnext; |
440 | pc->bh = bh; | |
1da177e4 LT |
441 | if (bh) { |
442 | pc->b_data = bh->b_data; | |
443 | pc->b_count = atomic_read(&bh->b_count); | |
444 | } | |
445 | } | |
446 | } | |
447 | } | |
448 | ||
d236d74c | 449 | static void idetape_update_buffers(struct ide_atapi_pc *pc) |
1da177e4 LT |
450 | { |
451 | struct idetape_bh *bh = pc->bh; | |
452 | int count; | |
d236d74c | 453 | unsigned int bcount = pc->xferred; |
1da177e4 | 454 | |
346331f8 | 455 | if (pc->flags & PC_FLAG_WRITING) |
1da177e4 LT |
456 | return; |
457 | while (bcount) { | |
1da177e4 | 458 | if (bh == NULL) { |
5a04cfa9 BP |
459 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
460 | __func__); | |
1da177e4 LT |
461 | return; |
462 | } | |
1da177e4 LT |
463 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
464 | atomic_set(&bh->b_count, count); | |
465 | if (atomic_read(&bh->b_count) == bh->b_size) | |
466 | bh = bh->b_reqnext; | |
467 | bcount -= count; | |
468 | } | |
469 | pc->bh = bh; | |
470 | } | |
471 | ||
472 | /* | |
473 | * idetape_next_pc_storage returns a pointer to a place in which we can | |
474 | * safely store a packet command, even though we intend to leave the | |
475 | * driver. A storage space for a maximum of IDETAPE_PC_STACK packet | |
476 | * commands is allocated at initialization time. | |
477 | */ | |
d236d74c | 478 | static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive) |
1da177e4 LT |
479 | { |
480 | idetape_tape_t *tape = drive->driver_data; | |
481 | ||
8004a8c9 BP |
482 | debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index); |
483 | ||
1da177e4 | 484 | if (tape->pc_stack_index == IDETAPE_PC_STACK) |
5a04cfa9 | 485 | tape->pc_stack_index = 0; |
1da177e4 LT |
486 | return (&tape->pc_stack[tape->pc_stack_index++]); |
487 | } | |
488 | ||
489 | /* | |
490 | * idetape_next_rq_storage is used along with idetape_next_pc_storage. | |
491 | * Since we queue packet commands in the request queue, we need to | |
492 | * allocate a request, along with the allocation of a packet command. | |
493 | */ | |
5a04cfa9 | 494 | |
1da177e4 LT |
495 | /************************************************************** |
496 | * * | |
497 | * This should get fixed to use kmalloc(.., GFP_ATOMIC) * | |
498 | * followed later on by kfree(). -ml * | |
499 | * * | |
500 | **************************************************************/ | |
5a04cfa9 BP |
501 | |
502 | static struct request *idetape_next_rq_storage(ide_drive_t *drive) | |
1da177e4 LT |
503 | { |
504 | idetape_tape_t *tape = drive->driver_data; | |
505 | ||
8004a8c9 BP |
506 | debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index); |
507 | ||
1da177e4 | 508 | if (tape->rq_stack_index == IDETAPE_PC_STACK) |
5a04cfa9 | 509 | tape->rq_stack_index = 0; |
1da177e4 LT |
510 | return (&tape->rq_stack[tape->rq_stack_index++]); |
511 | } | |
512 | ||
d236d74c | 513 | static void idetape_init_pc(struct ide_atapi_pc *pc) |
1da177e4 LT |
514 | { |
515 | memset(pc->c, 0, 12); | |
516 | pc->retries = 0; | |
517 | pc->flags = 0; | |
d236d74c BP |
518 | pc->req_xfer = 0; |
519 | pc->buf = pc->pc_buf; | |
520 | pc->buf_size = IDETAPE_PC_BUFFER_SIZE; | |
1da177e4 LT |
521 | pc->bh = NULL; |
522 | pc->b_data = NULL; | |
523 | } | |
524 | ||
525 | /* | |
1b5db434 BP |
526 | * called on each failed packet command retry to analyze the request sense. We |
527 | * currently do not utilize this information. | |
1da177e4 | 528 | */ |
1b5db434 | 529 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
530 | { |
531 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 532 | struct ide_atapi_pc *pc = tape->failed_pc; |
1da177e4 | 533 | |
1b5db434 BP |
534 | tape->sense_key = sense[2] & 0xF; |
535 | tape->asc = sense[12]; | |
536 | tape->ascq = sense[13]; | |
8004a8c9 BP |
537 | |
538 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
539 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 540 | |
d236d74c | 541 | /* Correct pc->xferred by asking the tape. */ |
346331f8 | 542 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
d236d74c | 543 | pc->xferred = pc->req_xfer - |
54bb2074 | 544 | tape->blk_size * |
860ff5ec | 545 | be32_to_cpu(get_unaligned((u32 *)&sense[3])); |
1da177e4 LT |
546 | idetape_update_buffers(pc); |
547 | } | |
548 | ||
549 | /* | |
550 | * If error was the result of a zero-length read or write command, | |
551 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
552 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
553 | */ | |
90699ce2 | 554 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
555 | /* length == 0 */ |
556 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
557 | if (tape->sense_key == 5) { | |
1da177e4 LT |
558 | /* don't report an error, everything's ok */ |
559 | pc->error = 0; | |
560 | /* don't retry read/write */ | |
346331f8 | 561 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
562 | } |
563 | } | |
90699ce2 | 564 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
1da177e4 | 565 | pc->error = IDETAPE_ERROR_FILEMARK; |
346331f8 | 566 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 567 | } |
90699ce2 | 568 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
569 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
570 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
1da177e4 | 571 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 572 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
573 | } |
574 | } | |
90699ce2 | 575 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 576 | if (tape->sense_key == 8) { |
1da177e4 | 577 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 578 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 579 | } |
346331f8 | 580 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 581 | pc->xferred) |
1da177e4 LT |
582 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
583 | } | |
584 | } | |
585 | ||
d01dbc3b BP |
586 | /* Free data buffers completely. */ |
587 | static void ide_tape_kfree_buffer(idetape_stage_t *stage) | |
1da177e4 LT |
588 | { |
589 | struct idetape_bh *prev_bh, *bh = stage->bh; | |
d01dbc3b BP |
590 | |
591 | while (bh) { | |
592 | u32 size = bh->b_size; | |
593 | ||
594 | while (size) { | |
595 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
596 | ||
597 | if (bh->b_data) | |
598 | free_pages((unsigned long)bh->b_data, order); | |
599 | ||
600 | size &= (order-1); | |
601 | bh->b_data += (1 << order) * PAGE_SIZE; | |
1da177e4 LT |
602 | } |
603 | prev_bh = bh; | |
604 | bh = bh->b_reqnext; | |
605 | kfree(prev_bh); | |
606 | } | |
607 | kfree(stage); | |
608 | } | |
609 | ||
1da177e4 LT |
610 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
611 | { | |
612 | struct request *rq = HWGROUP(drive)->rq; | |
613 | idetape_tape_t *tape = drive->driver_data; | |
614 | unsigned long flags; | |
615 | int error; | |
1da177e4 | 616 | |
8004a8c9 | 617 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
618 | |
619 | switch (uptodate) { | |
5a04cfa9 BP |
620 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
621 | case 1: error = 0; break; | |
622 | default: error = uptodate; | |
1da177e4 LT |
623 | } |
624 | rq->errors = error; | |
625 | if (error) | |
626 | tape->failed_pc = NULL; | |
627 | ||
3687221f BZ |
628 | if (!blk_special_request(rq)) { |
629 | ide_end_request(drive, uptodate, nr_sects); | |
630 | return 0; | |
631 | } | |
632 | ||
54bb2074 | 633 | spin_lock_irqsave(&tape->lock, flags); |
1da177e4 | 634 | |
1da177e4 | 635 | ide_end_drive_cmd(drive, 0, 0); |
1da177e4 | 636 | |
54bb2074 | 637 | spin_unlock_irqrestore(&tape->lock, flags); |
1da177e4 LT |
638 | return 0; |
639 | } | |
640 | ||
5a04cfa9 | 641 | static ide_startstop_t idetape_request_sense_callback(ide_drive_t *drive) |
1da177e4 LT |
642 | { |
643 | idetape_tape_t *tape = drive->driver_data; | |
644 | ||
8004a8c9 BP |
645 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
646 | ||
1da177e4 | 647 | if (!tape->pc->error) { |
d236d74c | 648 | idetape_analyze_error(drive, tape->pc->buf); |
1da177e4 LT |
649 | idetape_end_request(drive, 1, 0); |
650 | } else { | |
5a04cfa9 BP |
651 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - " |
652 | "Aborting request!\n"); | |
1da177e4 LT |
653 | idetape_end_request(drive, 0, 0); |
654 | } | |
655 | return ide_stopped; | |
656 | } | |
657 | ||
d236d74c | 658 | static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 659 | { |
5a04cfa9 | 660 | idetape_init_pc(pc); |
90699ce2 | 661 | pc->c[0] = REQUEST_SENSE; |
1da177e4 | 662 | pc->c[4] = 20; |
d236d74c BP |
663 | pc->req_xfer = 20; |
664 | pc->idetape_callback = &idetape_request_sense_callback; | |
1da177e4 LT |
665 | } |
666 | ||
667 | static void idetape_init_rq(struct request *rq, u8 cmd) | |
668 | { | |
669 | memset(rq, 0, sizeof(*rq)); | |
4aff5e23 | 670 | rq->cmd_type = REQ_TYPE_SPECIAL; |
1da177e4 LT |
671 | rq->cmd[0] = cmd; |
672 | } | |
673 | ||
674 | /* | |
3c98bf34 BP |
675 | * Generate a new packet command request in front of the request queue, before |
676 | * the current request, so that it will be processed immediately, on the next | |
677 | * pass through the driver. The function below is called from the request | |
678 | * handling part of the driver (the "bottom" part). Safe storage for the request | |
679 | * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that. | |
1da177e4 | 680 | * |
3c98bf34 BP |
681 | * Memory for those requests is pre-allocated at initialization time, and is |
682 | * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for | |
683 | * the maximum possible number of inter-dependent packet commands. | |
1da177e4 | 684 | * |
3c98bf34 BP |
685 | * The higher level of the driver - The ioctl handler and the character device |
686 | * handling functions should queue request to the lower level part and wait for | |
687 | * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail. | |
1da177e4 | 688 | */ |
d236d74c | 689 | static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 690 | struct request *rq) |
1da177e4 LT |
691 | { |
692 | struct ide_tape_obj *tape = drive->driver_data; | |
693 | ||
694 | idetape_init_rq(rq, REQ_IDETAPE_PC1); | |
695 | rq->buffer = (char *) pc; | |
696 | rq->rq_disk = tape->disk; | |
697 | (void) ide_do_drive_cmd(drive, rq, ide_preempt); | |
698 | } | |
699 | ||
700 | /* | |
701 | * idetape_retry_pc is called when an error was detected during the | |
702 | * last packet command. We queue a request sense packet command in | |
703 | * the head of the request list. | |
704 | */ | |
705 | static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) | |
706 | { | |
707 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 708 | struct ide_atapi_pc *pc; |
1da177e4 | 709 | struct request *rq; |
1da177e4 | 710 | |
64a57fe4 | 711 | (void)ide_read_error(drive); |
1da177e4 LT |
712 | pc = idetape_next_pc_storage(drive); |
713 | rq = idetape_next_rq_storage(drive); | |
714 | idetape_create_request_sense_cmd(pc); | |
346331f8 | 715 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
1da177e4 LT |
716 | idetape_queue_pc_head(drive, pc, rq); |
717 | return ide_stopped; | |
718 | } | |
719 | ||
720 | /* | |
3c98bf34 BP |
721 | * Postpone the current request so that ide.c will be able to service requests |
722 | * from another device on the same hwgroup while we are polling for DSC. | |
1da177e4 | 723 | */ |
5a04cfa9 | 724 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
725 | { |
726 | idetape_tape_t *tape = drive->driver_data; | |
727 | ||
8004a8c9 BP |
728 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
729 | ||
1da177e4 | 730 | tape->postponed_rq = HWGROUP(drive)->rq; |
54bb2074 | 731 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
732 | } |
733 | ||
d236d74c | 734 | typedef void idetape_io_buf(ide_drive_t *, struct ide_atapi_pc *, unsigned int); |
a1efc85f | 735 | |
1da177e4 | 736 | /* |
a1efc85f BP |
737 | * This is the usual interrupt handler which will be called during a packet |
738 | * command. We will transfer some of the data (as requested by the drive) and | |
739 | * will re-point interrupt handler to us. When data transfer is finished, we | |
740 | * will act according to the algorithm described before | |
8d06bfad | 741 | * idetape_issue_pc. |
1da177e4 | 742 | */ |
a1efc85f | 743 | static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) |
1da177e4 LT |
744 | { |
745 | ide_hwif_t *hwif = drive->hwif; | |
746 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 747 | struct ide_atapi_pc *pc = tape->pc; |
a1efc85f BP |
748 | xfer_func_t *xferfunc; |
749 | idetape_io_buf *iobuf; | |
1da177e4 LT |
750 | unsigned int temp; |
751 | #if SIMULATE_ERRORS | |
5a04cfa9 | 752 | static int error_sim_count; |
1da177e4 | 753 | #endif |
790d1239 | 754 | u16 bcount; |
8e7657ae | 755 | u8 stat, ireason; |
1da177e4 | 756 | |
8004a8c9 | 757 | debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__); |
1da177e4 LT |
758 | |
759 | /* Clear the interrupt */ | |
c47137a9 | 760 | stat = ide_read_status(drive); |
1da177e4 | 761 | |
346331f8 | 762 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
5e37bdc0 | 763 | if (hwif->dma_ops->dma_end(drive) || (stat & ERR_STAT)) { |
1da177e4 LT |
764 | /* |
765 | * A DMA error is sometimes expected. For example, | |
766 | * if the tape is crossing a filemark during a | |
767 | * READ command, it will issue an irq and position | |
768 | * itself before the filemark, so that only a partial | |
769 | * data transfer will occur (which causes the DMA | |
770 | * error). In that case, we will later ask the tape | |
771 | * how much bytes of the original request were | |
772 | * actually transferred (we can't receive that | |
773 | * information from the DMA engine on most chipsets). | |
774 | */ | |
775 | ||
776 | /* | |
777 | * On the contrary, a DMA error is never expected; | |
778 | * it usually indicates a hardware error or abort. | |
779 | * If the tape crosses a filemark during a READ | |
780 | * command, it will issue an irq and position itself | |
781 | * after the filemark (not before). Only a partial | |
782 | * data transfer will occur, but no DMA error. | |
783 | * (AS, 19 Apr 2001) | |
784 | */ | |
346331f8 | 785 | pc->flags |= PC_FLAG_DMA_ERROR; |
1da177e4 | 786 | } else { |
d236d74c | 787 | pc->xferred = pc->req_xfer; |
1da177e4 LT |
788 | idetape_update_buffers(pc); |
789 | } | |
8004a8c9 BP |
790 | debug_log(DBG_PROCS, "DMA finished\n"); |
791 | ||
1da177e4 LT |
792 | } |
793 | ||
794 | /* No more interrupts */ | |
22c525b9 | 795 | if ((stat & DRQ_STAT) == 0) { |
8004a8c9 | 796 | debug_log(DBG_SENSE, "Packet command completed, %d bytes" |
d236d74c | 797 | " transferred\n", pc->xferred); |
1da177e4 | 798 | |
346331f8 | 799 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
1da177e4 LT |
800 | local_irq_enable(); |
801 | ||
802 | #if SIMULATE_ERRORS | |
90699ce2 | 803 | if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) && |
1da177e4 LT |
804 | (++error_sim_count % 100) == 0) { |
805 | printk(KERN_INFO "ide-tape: %s: simulating error\n", | |
806 | tape->name); | |
22c525b9 | 807 | stat |= ERR_STAT; |
1da177e4 LT |
808 | } |
809 | #endif | |
90699ce2 | 810 | if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE) |
22c525b9 | 811 | stat &= ~ERR_STAT; |
346331f8 | 812 | if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) { |
22c525b9 | 813 | /* Error detected */ |
8004a8c9 BP |
814 | debug_log(DBG_ERR, "%s: I/O error\n", tape->name); |
815 | ||
90699ce2 | 816 | if (pc->c[0] == REQUEST_SENSE) { |
a1efc85f BP |
817 | printk(KERN_ERR "ide-tape: I/O error in request" |
818 | " sense command\n"); | |
1da177e4 LT |
819 | return ide_do_reset(drive); |
820 | } | |
8004a8c9 BP |
821 | debug_log(DBG_ERR, "[cmd %x]: check condition\n", |
822 | pc->c[0]); | |
823 | ||
1da177e4 LT |
824 | /* Retry operation */ |
825 | return idetape_retry_pc(drive); | |
826 | } | |
827 | pc->error = 0; | |
346331f8 | 828 | if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && |
22c525b9 | 829 | (stat & SEEK_STAT) == 0) { |
1da177e4 LT |
830 | /* Media access command */ |
831 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 832 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; |
1da177e4 LT |
833 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; |
834 | /* Allow ide.c to handle other requests */ | |
835 | idetape_postpone_request(drive); | |
836 | return ide_stopped; | |
837 | } | |
838 | if (tape->failed_pc == pc) | |
839 | tape->failed_pc = NULL; | |
840 | /* Command finished - Call the callback function */ | |
d236d74c | 841 | return pc->idetape_callback(drive); |
1da177e4 | 842 | } |
346331f8 BP |
843 | |
844 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { | |
845 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; | |
1da177e4 LT |
846 | printk(KERN_ERR "ide-tape: The tape wants to issue more " |
847 | "interrupts in DMA mode\n"); | |
848 | printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); | |
7469aaf6 | 849 | ide_dma_off(drive); |
1da177e4 LT |
850 | return ide_do_reset(drive); |
851 | } | |
852 | /* Get the number of bytes to transfer on this interrupt. */ | |
4c3032d8 BZ |
853 | bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) | |
854 | hwif->INB(hwif->io_ports.lbam_addr); | |
1da177e4 | 855 | |
4c3032d8 | 856 | ireason = hwif->INB(hwif->io_ports.nsect_addr); |
1da177e4 | 857 | |
8e7657ae | 858 | if (ireason & CD) { |
a1efc85f | 859 | printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__); |
1da177e4 LT |
860 | return ide_do_reset(drive); |
861 | } | |
346331f8 | 862 | if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) { |
1da177e4 LT |
863 | /* Hopefully, we will never get here */ |
864 | printk(KERN_ERR "ide-tape: We wanted to %s, ", | |
8e7657ae | 865 | (ireason & IO) ? "Write" : "Read"); |
1da177e4 | 866 | printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n", |
8e7657ae | 867 | (ireason & IO) ? "Read" : "Write"); |
1da177e4 LT |
868 | return ide_do_reset(drive); |
869 | } | |
346331f8 | 870 | if (!(pc->flags & PC_FLAG_WRITING)) { |
1da177e4 | 871 | /* Reading - Check that we have enough space */ |
d236d74c BP |
872 | temp = pc->xferred + bcount; |
873 | if (temp > pc->req_xfer) { | |
874 | if (temp > pc->buf_size) { | |
a1efc85f BP |
875 | printk(KERN_ERR "ide-tape: The tape wants to " |
876 | "send us more data than expected " | |
877 | "- discarding data\n"); | |
7616c0ad | 878 | ide_atapi_discard_data(drive, bcount); |
a1efc85f BP |
879 | ide_set_handler(drive, &idetape_pc_intr, |
880 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
881 | return ide_started; |
882 | } | |
8004a8c9 BP |
883 | debug_log(DBG_SENSE, "The tape wants to send us more " |
884 | "data than expected - allowing transfer\n"); | |
1da177e4 | 885 | } |
a1efc85f BP |
886 | iobuf = &idetape_input_buffers; |
887 | xferfunc = hwif->atapi_input_bytes; | |
1da177e4 | 888 | } else { |
a1efc85f BP |
889 | iobuf = &idetape_output_buffers; |
890 | xferfunc = hwif->atapi_output_bytes; | |
1da177e4 | 891 | } |
a1efc85f BP |
892 | |
893 | if (pc->bh) | |
894 | iobuf(drive, pc, bcount); | |
895 | else | |
d236d74c | 896 | xferfunc(drive, pc->cur_pos, bcount); |
a1efc85f | 897 | |
1da177e4 | 898 | /* Update the current position */ |
d236d74c BP |
899 | pc->xferred += bcount; |
900 | pc->cur_pos += bcount; | |
8004a8c9 BP |
901 | |
902 | debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n", | |
903 | pc->c[0], bcount); | |
904 | ||
1da177e4 LT |
905 | /* And set the interrupt handler again */ |
906 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); | |
907 | return ide_started; | |
908 | } | |
909 | ||
910 | /* | |
3c98bf34 | 911 | * Packet Command Interface |
1da177e4 | 912 | * |
3c98bf34 BP |
913 | * The current Packet Command is available in tape->pc, and will not change |
914 | * until we finish handling it. Each packet command is associated with a | |
915 | * callback function that will be called when the command is finished. | |
1da177e4 | 916 | * |
3c98bf34 | 917 | * The handling will be done in three stages: |
1da177e4 | 918 | * |
3c98bf34 BP |
919 | * 1. idetape_issue_pc will send the packet command to the drive, and will set |
920 | * the interrupt handler to idetape_pc_intr. | |
1da177e4 | 921 | * |
3c98bf34 BP |
922 | * 2. On each interrupt, idetape_pc_intr will be called. This step will be |
923 | * repeated until the device signals us that no more interrupts will be issued. | |
1da177e4 | 924 | * |
3c98bf34 BP |
925 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
926 | * process. In case of a successful initiation of a media access packet command, | |
927 | * the DSC bit will be set when the actual execution of the command is finished. | |
928 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
929 | * event. In this case, we define the request as "low priority request" by | |
930 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
931 | * exit the driver. | |
1da177e4 | 932 | * |
3c98bf34 BP |
933 | * ide.c will then give higher priority to requests which originate from the |
934 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 935 | * |
3c98bf34 | 936 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 937 | * |
3c98bf34 BP |
938 | * 5. In case an error was found, we queue a request sense packet command in |
939 | * front of the request queue and retry the operation up to | |
940 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 941 | * |
3c98bf34 BP |
942 | * 6. In case no error was found, or we decided to give up and not to retry |
943 | * again, the callback function will be called and then we will handle the next | |
944 | * request. | |
1da177e4 LT |
945 | */ |
946 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) | |
947 | { | |
948 | ide_hwif_t *hwif = drive->hwif; | |
949 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 950 | struct ide_atapi_pc *pc = tape->pc; |
1da177e4 LT |
951 | int retries = 100; |
952 | ide_startstop_t startstop; | |
8e7657ae | 953 | u8 ireason; |
1da177e4 | 954 | |
5a04cfa9 BP |
955 | if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) { |
956 | printk(KERN_ERR "ide-tape: Strange, packet command initiated " | |
957 | "yet DRQ isn't asserted\n"); | |
1da177e4 LT |
958 | return startstop; |
959 | } | |
4c3032d8 | 960 | ireason = hwif->INB(hwif->io_ports.nsect_addr); |
8e7657ae | 961 | while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { |
1da177e4 LT |
962 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " |
963 | "a packet command, retrying\n"); | |
964 | udelay(100); | |
4c3032d8 | 965 | ireason = hwif->INB(hwif->io_ports.nsect_addr); |
1da177e4 LT |
966 | if (retries == 0) { |
967 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " | |
968 | "issuing a packet command, ignoring\n"); | |
8e7657ae BZ |
969 | ireason |= CD; |
970 | ireason &= ~IO; | |
1da177e4 LT |
971 | } |
972 | } | |
8e7657ae | 973 | if ((ireason & CD) == 0 || (ireason & IO)) { |
1da177e4 LT |
974 | printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " |
975 | "a packet command\n"); | |
976 | return ide_do_reset(drive); | |
977 | } | |
978 | /* Set the interrupt routine */ | |
979 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); | |
980 | #ifdef CONFIG_BLK_DEV_IDEDMA | |
981 | /* Begin DMA, if necessary */ | |
346331f8 | 982 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) |
5e37bdc0 | 983 | hwif->dma_ops->dma_start(drive); |
1da177e4 LT |
984 | #endif |
985 | /* Send the actual packet */ | |
986 | HWIF(drive)->atapi_output_bytes(drive, pc->c, 12); | |
987 | return ide_started; | |
988 | } | |
989 | ||
d236d74c BP |
990 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
991 | struct ide_atapi_pc *pc) | |
1da177e4 LT |
992 | { |
993 | ide_hwif_t *hwif = drive->hwif; | |
994 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 995 | int dma_ok = 0; |
790d1239 | 996 | u16 bcount; |
1da177e4 | 997 | |
90699ce2 BP |
998 | if (tape->pc->c[0] == REQUEST_SENSE && |
999 | pc->c[0] == REQUEST_SENSE) { | |
1da177e4 LT |
1000 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
1001 | "Two request sense in serial were issued\n"); | |
1002 | } | |
1da177e4 | 1003 | |
90699ce2 | 1004 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
1da177e4 LT |
1005 | tape->failed_pc = pc; |
1006 | /* Set the current packet command */ | |
1007 | tape->pc = pc; | |
1008 | ||
1009 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 1010 | (pc->flags & PC_FLAG_ABORT)) { |
1da177e4 | 1011 | /* |
3c98bf34 BP |
1012 | * We will "abort" retrying a packet command in case legitimate |
1013 | * error code was received (crossing a filemark, or end of the | |
1014 | * media, for example). | |
1da177e4 | 1015 | */ |
346331f8 | 1016 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 1017 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
1018 | tape->sense_key == 2 && tape->asc == 4 && |
1019 | (tape->ascq == 1 || tape->ascq == 8))) { | |
1020 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
1021 | "pc = %2x, key = %2x, " | |
1022 | "asc = %2x, ascq = %2x\n", | |
1023 | tape->name, pc->c[0], | |
1024 | tape->sense_key, tape->asc, | |
1025 | tape->ascq); | |
1026 | } | |
1027 | /* Giving up */ | |
1028 | pc->error = IDETAPE_ERROR_GENERAL; | |
1029 | } | |
1030 | tape->failed_pc = NULL; | |
d236d74c | 1031 | return pc->idetape_callback(drive); |
1da177e4 | 1032 | } |
8004a8c9 | 1033 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
1034 | |
1035 | pc->retries++; | |
1036 | /* We haven't transferred any data yet */ | |
d236d74c BP |
1037 | pc->xferred = 0; |
1038 | pc->cur_pos = pc->buf; | |
1da177e4 | 1039 | /* Request to transfer the entire buffer at once */ |
d236d74c | 1040 | bcount = pc->req_xfer; |
1da177e4 | 1041 | |
346331f8 BP |
1042 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
1043 | pc->flags &= ~PC_FLAG_DMA_ERROR; | |
1da177e4 LT |
1044 | printk(KERN_WARNING "ide-tape: DMA disabled, " |
1045 | "reverting to PIO\n"); | |
7469aaf6 | 1046 | ide_dma_off(drive); |
1da177e4 | 1047 | } |
346331f8 | 1048 | if ((pc->flags & PC_FLAG_DMA_RECOMMENDED) && drive->using_dma) |
5e37bdc0 | 1049 | dma_ok = !hwif->dma_ops->dma_setup(drive); |
1da177e4 | 1050 | |
2fc57388 BZ |
1051 | ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK | |
1052 | IDE_TFLAG_OUT_DEVICE, bcount, dma_ok); | |
1053 | ||
346331f8 BP |
1054 | if (dma_ok) |
1055 | /* Will begin DMA later */ | |
1056 | pc->flags |= PC_FLAG_DMA_IN_PROGRESS; | |
1057 | if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags)) { | |
c1c9dbc8 BZ |
1058 | ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc, |
1059 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
1060 | return ide_started; |
1061 | } else { | |
4c3032d8 | 1062 | hwif->OUTB(WIN_PACKETCMD, hwif->io_ports.command_addr); |
1da177e4 LT |
1063 | return idetape_transfer_pc(drive); |
1064 | } | |
1065 | } | |
1066 | ||
5a04cfa9 | 1067 | static ide_startstop_t idetape_pc_callback(ide_drive_t *drive) |
1da177e4 LT |
1068 | { |
1069 | idetape_tape_t *tape = drive->driver_data; | |
8004a8c9 BP |
1070 | |
1071 | debug_log(DBG_PROCS, "Enter %s\n", __func__); | |
1da177e4 LT |
1072 | |
1073 | idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); | |
1074 | return ide_stopped; | |
1075 | } | |
1076 | ||
3c98bf34 | 1077 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 1078 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 LT |
1079 | { |
1080 | idetape_init_pc(pc); | |
90699ce2 | 1081 | pc->c[0] = MODE_SENSE; |
1da177e4 | 1082 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
1083 | /* DBD = 1 - Don't return block descriptors */ |
1084 | pc->c[1] = 8; | |
1da177e4 LT |
1085 | pc->c[2] = page_code; |
1086 | /* | |
1087 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
1088 | * | |
1089 | * For SCSI this byte is defined as subpage instead of high byte | |
1090 | * of length and some IDE drives seem to interpret it this way | |
1091 | * and return an error when 255 is used. | |
1092 | */ | |
1093 | pc->c[3] = 0; | |
3c98bf34 BP |
1094 | /* We will just discard data in that case */ |
1095 | pc->c[4] = 255; | |
1da177e4 | 1096 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 1097 | pc->req_xfer = 12; |
1da177e4 | 1098 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 1099 | pc->req_xfer = 24; |
1da177e4 | 1100 | else |
d236d74c BP |
1101 | pc->req_xfer = 50; |
1102 | pc->idetape_callback = &idetape_pc_callback; | |
1da177e4 LT |
1103 | } |
1104 | ||
5a04cfa9 | 1105 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 LT |
1106 | { |
1107 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1108 | struct ide_atapi_pc *pc = tape->pc; |
22c525b9 | 1109 | u8 stat; |
1da177e4 | 1110 | |
c47137a9 BZ |
1111 | stat = ide_read_status(drive); |
1112 | ||
22c525b9 BZ |
1113 | if (stat & SEEK_STAT) { |
1114 | if (stat & ERR_STAT) { | |
1da177e4 | 1115 | /* Error detected */ |
90699ce2 | 1116 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
1117 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
1118 | tape->name); | |
1119 | /* Retry operation */ | |
1120 | return idetape_retry_pc(drive); | |
1121 | } | |
1122 | pc->error = 0; | |
1123 | if (tape->failed_pc == pc) | |
1124 | tape->failed_pc = NULL; | |
1125 | } else { | |
1126 | pc->error = IDETAPE_ERROR_GENERAL; | |
1127 | tape->failed_pc = NULL; | |
1128 | } | |
d236d74c | 1129 | return pc->idetape_callback(drive); |
1da177e4 LT |
1130 | } |
1131 | ||
5a04cfa9 | 1132 | static ide_startstop_t idetape_rw_callback(ide_drive_t *drive) |
1da177e4 LT |
1133 | { |
1134 | idetape_tape_t *tape = drive->driver_data; | |
1135 | struct request *rq = HWGROUP(drive)->rq; | |
d236d74c | 1136 | int blocks = tape->pc->xferred / tape->blk_size; |
1da177e4 | 1137 | |
54bb2074 | 1138 | tape->avg_size += blocks * tape->blk_size; |
83042b24 | 1139 | |
9bae1ff3 | 1140 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { |
5a04cfa9 BP |
1141 | tape->avg_speed = tape->avg_size * HZ / |
1142 | (jiffies - tape->avg_time) / 1024; | |
1da177e4 LT |
1143 | tape->avg_size = 0; |
1144 | tape->avg_time = jiffies; | |
1145 | } | |
8004a8c9 | 1146 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 | 1147 | |
54bb2074 | 1148 | tape->first_frame += blocks; |
1da177e4 LT |
1149 | rq->current_nr_sectors -= blocks; |
1150 | ||
1151 | if (!tape->pc->error) | |
1152 | idetape_end_request(drive, 1, 0); | |
1153 | else | |
1154 | idetape_end_request(drive, tape->pc->error, 0); | |
1155 | return ide_stopped; | |
1156 | } | |
1157 | ||
d236d74c BP |
1158 | static void idetape_create_read_cmd(idetape_tape_t *tape, |
1159 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1160 | unsigned int length, struct idetape_bh *bh) |
1da177e4 LT |
1161 | { |
1162 | idetape_init_pc(pc); | |
90699ce2 | 1163 | pc->c[0] = READ_6; |
860ff5ec | 1164 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 1165 | pc->c[1] = 1; |
d236d74c | 1166 | pc->idetape_callback = &idetape_rw_callback; |
1da177e4 LT |
1167 | pc->bh = bh; |
1168 | atomic_set(&bh->b_count, 0); | |
d236d74c BP |
1169 | pc->buf = NULL; |
1170 | pc->buf_size = length * tape->blk_size; | |
1171 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 1172 | if (pc->req_xfer == tape->buffer_size) |
346331f8 | 1173 | pc->flags |= PC_FLAG_DMA_RECOMMENDED; |
1da177e4 LT |
1174 | } |
1175 | ||
d236d74c BP |
1176 | static void idetape_create_write_cmd(idetape_tape_t *tape, |
1177 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1178 | unsigned int length, struct idetape_bh *bh) |
1da177e4 LT |
1179 | { |
1180 | idetape_init_pc(pc); | |
90699ce2 | 1181 | pc->c[0] = WRITE_6; |
860ff5ec | 1182 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 1183 | pc->c[1] = 1; |
d236d74c | 1184 | pc->idetape_callback = &idetape_rw_callback; |
346331f8 | 1185 | pc->flags |= PC_FLAG_WRITING; |
1da177e4 LT |
1186 | pc->bh = bh; |
1187 | pc->b_data = bh->b_data; | |
1188 | pc->b_count = atomic_read(&bh->b_count); | |
d236d74c BP |
1189 | pc->buf = NULL; |
1190 | pc->buf_size = length * tape->blk_size; | |
1191 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 1192 | if (pc->req_xfer == tape->buffer_size) |
346331f8 | 1193 | pc->flags |= PC_FLAG_DMA_RECOMMENDED; |
1da177e4 LT |
1194 | } |
1195 | ||
1da177e4 LT |
1196 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
1197 | struct request *rq, sector_t block) | |
1198 | { | |
1199 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1200 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 1201 | struct request *postponed_rq = tape->postponed_rq; |
22c525b9 | 1202 | u8 stat; |
1da177e4 | 1203 | |
8004a8c9 BP |
1204 | debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld," |
1205 | " current_nr_sectors: %d\n", | |
1da177e4 | 1206 | rq->sector, rq->nr_sectors, rq->current_nr_sectors); |
1da177e4 | 1207 | |
4aff5e23 | 1208 | if (!blk_special_request(rq)) { |
3c98bf34 | 1209 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 1210 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 1211 | "request queue (%d)\n", drive->name, rq->cmd_type); |
1da177e4 LT |
1212 | ide_end_request(drive, 0, 0); |
1213 | return ide_stopped; | |
1214 | } | |
1215 | ||
3c98bf34 | 1216 | /* Retry a failed packet command */ |
5a04cfa9 | 1217 | if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) |
8d06bfad | 1218 | return idetape_issue_pc(drive, tape->failed_pc); |
5a04cfa9 | 1219 | |
1da177e4 LT |
1220 | if (postponed_rq != NULL) |
1221 | if (rq != postponed_rq) { | |
1222 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
1223 | "Two DSC requests were queued\n"); | |
1224 | idetape_end_request(drive, 0, 0); | |
1225 | return ide_stopped; | |
1226 | } | |
1da177e4 LT |
1227 | |
1228 | tape->postponed_rq = NULL; | |
1229 | ||
1230 | /* | |
1231 | * If the tape is still busy, postpone our request and service | |
1232 | * the other device meanwhile. | |
1233 | */ | |
c47137a9 | 1234 | stat = ide_read_status(drive); |
1da177e4 LT |
1235 | |
1236 | if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) | |
346331f8 | 1237 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
1da177e4 LT |
1238 | |
1239 | if (drive->post_reset == 1) { | |
346331f8 | 1240 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
1da177e4 LT |
1241 | drive->post_reset = 0; |
1242 | } | |
1243 | ||
346331f8 | 1244 | if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) && |
22c525b9 | 1245 | (stat & SEEK_STAT) == 0) { |
1da177e4 LT |
1246 | if (postponed_rq == NULL) { |
1247 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 1248 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
1249 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
1250 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
1251 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
1252 | tape->name); | |
1253 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { | |
1254 | idetape_media_access_finished(drive); | |
1255 | return ide_stopped; | |
1256 | } else { | |
1257 | return ide_do_reset(drive); | |
1258 | } | |
5a04cfa9 BP |
1259 | } else if (time_after(jiffies, |
1260 | tape->dsc_polling_start + | |
1261 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 1262 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
1263 | idetape_postpone_request(drive); |
1264 | return ide_stopped; | |
1265 | } | |
1266 | if (rq->cmd[0] & REQ_IDETAPE_READ) { | |
1da177e4 | 1267 | pc = idetape_next_pc_storage(drive); |
5a04cfa9 BP |
1268 | idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, |
1269 | (struct idetape_bh *)rq->special); | |
1da177e4 LT |
1270 | goto out; |
1271 | } | |
1272 | if (rq->cmd[0] & REQ_IDETAPE_WRITE) { | |
1da177e4 | 1273 | pc = idetape_next_pc_storage(drive); |
5a04cfa9 BP |
1274 | idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, |
1275 | (struct idetape_bh *)rq->special); | |
1da177e4 LT |
1276 | goto out; |
1277 | } | |
1da177e4 | 1278 | if (rq->cmd[0] & REQ_IDETAPE_PC1) { |
d236d74c | 1279 | pc = (struct ide_atapi_pc *) rq->buffer; |
1da177e4 LT |
1280 | rq->cmd[0] &= ~(REQ_IDETAPE_PC1); |
1281 | rq->cmd[0] |= REQ_IDETAPE_PC2; | |
1282 | goto out; | |
1283 | } | |
1284 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { | |
1285 | idetape_media_access_finished(drive); | |
1286 | return ide_stopped; | |
1287 | } | |
1288 | BUG(); | |
1289 | out: | |
8d06bfad | 1290 | return idetape_issue_pc(drive, pc); |
1da177e4 LT |
1291 | } |
1292 | ||
1da177e4 | 1293 | /* |
41aa1706 | 1294 | * The function below uses __get_free_pages to allocate a data buffer of size |
f73850a3 | 1295 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
3c98bf34 | 1296 | * much as possible. |
1da177e4 | 1297 | * |
41aa1706 BP |
1298 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
1299 | * failure. | |
1da177e4 | 1300 | */ |
41aa1706 | 1301 | static idetape_stage_t *ide_tape_kmalloc_buffer(idetape_tape_t *tape, int full, |
5a04cfa9 | 1302 | int clear) |
1da177e4 LT |
1303 | { |
1304 | idetape_stage_t *stage; | |
1305 | struct idetape_bh *prev_bh, *bh; | |
a997a435 | 1306 | int pages = tape->pages_per_buffer; |
41aa1706 | 1307 | unsigned int order, b_allocd; |
1da177e4 LT |
1308 | char *b_data = NULL; |
1309 | ||
5a04cfa9 BP |
1310 | stage = kmalloc(sizeof(idetape_stage_t), GFP_KERNEL); |
1311 | if (!stage) | |
1da177e4 LT |
1312 | return NULL; |
1313 | stage->next = NULL; | |
1314 | ||
5a04cfa9 BP |
1315 | stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1316 | bh = stage->bh; | |
1da177e4 LT |
1317 | if (bh == NULL) |
1318 | goto abort; | |
41aa1706 BP |
1319 | |
1320 | order = fls(pages) - 1; | |
1321 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 1322 | if (!bh->b_data) |
1da177e4 | 1323 | goto abort; |
41aa1706 BP |
1324 | b_allocd = (1 << order) * PAGE_SIZE; |
1325 | pages &= (order-1); | |
1326 | ||
1da177e4 | 1327 | if (clear) |
41aa1706 BP |
1328 | memset(bh->b_data, 0, b_allocd); |
1329 | bh->b_reqnext = NULL; | |
1330 | bh->b_size = b_allocd; | |
1da177e4 LT |
1331 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1332 | ||
41aa1706 BP |
1333 | while (pages) { |
1334 | order = fls(pages) - 1; | |
1335 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 1336 | if (!b_data) |
1da177e4 | 1337 | goto abort; |
41aa1706 BP |
1338 | b_allocd = (1 << order) * PAGE_SIZE; |
1339 | ||
1da177e4 | 1340 | if (clear) |
41aa1706 BP |
1341 | memset(b_data, 0, b_allocd); |
1342 | ||
1343 | /* newly allocated page frames below buffer header or ...*/ | |
1344 | if (bh->b_data == b_data + b_allocd) { | |
1345 | bh->b_size += b_allocd; | |
1346 | bh->b_data -= b_allocd; | |
1da177e4 | 1347 | if (full) |
41aa1706 | 1348 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1349 | continue; |
1350 | } | |
41aa1706 | 1351 | /* they are above the header */ |
1da177e4 | 1352 | if (b_data == bh->b_data + bh->b_size) { |
41aa1706 | 1353 | bh->b_size += b_allocd; |
1da177e4 | 1354 | if (full) |
41aa1706 | 1355 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1356 | continue; |
1357 | } | |
1358 | prev_bh = bh; | |
5a04cfa9 BP |
1359 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1360 | if (!bh) { | |
41aa1706 | 1361 | free_pages((unsigned long) b_data, order); |
1da177e4 LT |
1362 | goto abort; |
1363 | } | |
1364 | bh->b_reqnext = NULL; | |
1365 | bh->b_data = b_data; | |
41aa1706 | 1366 | bh->b_size = b_allocd; |
1da177e4 LT |
1367 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1368 | prev_bh->b_reqnext = bh; | |
41aa1706 BP |
1369 | |
1370 | pages &= (order-1); | |
1da177e4 | 1371 | } |
41aa1706 | 1372 | |
1da177e4 LT |
1373 | bh->b_size -= tape->excess_bh_size; |
1374 | if (full) | |
1375 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
1376 | return stage; | |
1377 | abort: | |
d01dbc3b | 1378 | ide_tape_kfree_buffer(stage); |
1da177e4 LT |
1379 | return NULL; |
1380 | } | |
1381 | ||
5a04cfa9 | 1382 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
8646c88f | 1383 | const char __user *buf, int n) |
1da177e4 LT |
1384 | { |
1385 | struct idetape_bh *bh = tape->bh; | |
1386 | int count; | |
dcd96379 | 1387 | int ret = 0; |
1da177e4 LT |
1388 | |
1389 | while (n) { | |
1da177e4 | 1390 | if (bh == NULL) { |
5a04cfa9 BP |
1391 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1392 | __func__); | |
dcd96379 | 1393 | return 1; |
1da177e4 | 1394 | } |
5a04cfa9 BP |
1395 | count = min((unsigned int) |
1396 | (bh->b_size - atomic_read(&bh->b_count)), | |
1397 | (unsigned int)n); | |
1398 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
1399 | count)) | |
dcd96379 | 1400 | ret = 1; |
1da177e4 LT |
1401 | n -= count; |
1402 | atomic_add(count, &bh->b_count); | |
1403 | buf += count; | |
1404 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
1405 | bh = bh->b_reqnext; | |
1406 | if (bh) | |
1407 | atomic_set(&bh->b_count, 0); | |
1408 | } | |
1409 | } | |
1410 | tape->bh = bh; | |
dcd96379 | 1411 | return ret; |
1da177e4 LT |
1412 | } |
1413 | ||
5a04cfa9 | 1414 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
99d74e61 | 1415 | int n) |
1da177e4 LT |
1416 | { |
1417 | struct idetape_bh *bh = tape->bh; | |
1418 | int count; | |
dcd96379 | 1419 | int ret = 0; |
1da177e4 LT |
1420 | |
1421 | while (n) { | |
1da177e4 | 1422 | if (bh == NULL) { |
5a04cfa9 BP |
1423 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1424 | __func__); | |
dcd96379 | 1425 | return 1; |
1da177e4 | 1426 | } |
1da177e4 | 1427 | count = min(tape->b_count, n); |
dcd96379 DW |
1428 | if (copy_to_user(buf, tape->b_data, count)) |
1429 | ret = 1; | |
1da177e4 LT |
1430 | n -= count; |
1431 | tape->b_data += count; | |
1432 | tape->b_count -= count; | |
1433 | buf += count; | |
1434 | if (!tape->b_count) { | |
5a04cfa9 BP |
1435 | bh = bh->b_reqnext; |
1436 | tape->bh = bh; | |
1da177e4 LT |
1437 | if (bh) { |
1438 | tape->b_data = bh->b_data; | |
1439 | tape->b_count = atomic_read(&bh->b_count); | |
1440 | } | |
1441 | } | |
1442 | } | |
dcd96379 | 1443 | return ret; |
1da177e4 LT |
1444 | } |
1445 | ||
5a04cfa9 | 1446 | static void idetape_init_merge_stage(idetape_tape_t *tape) |
1da177e4 LT |
1447 | { |
1448 | struct idetape_bh *bh = tape->merge_stage->bh; | |
5a04cfa9 | 1449 | |
1da177e4 | 1450 | tape->bh = bh; |
54abf37e | 1451 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 LT |
1452 | atomic_set(&bh->b_count, 0); |
1453 | else { | |
1454 | tape->b_data = bh->b_data; | |
1455 | tape->b_count = atomic_read(&bh->b_count); | |
1456 | } | |
1457 | } | |
1458 | ||
a2f5b7f4 | 1459 | static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive) |
1da177e4 LT |
1460 | { |
1461 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1462 | u8 *readpos = tape->pc->buf; |
8004a8c9 BP |
1463 | |
1464 | debug_log(DBG_PROCS, "Enter %s\n", __func__); | |
1da177e4 LT |
1465 | |
1466 | if (!tape->pc->error) { | |
a2f5b7f4 BP |
1467 | debug_log(DBG_SENSE, "BOP - %s\n", |
1468 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
1469 | debug_log(DBG_SENSE, "EOP - %s\n", | |
1470 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
1471 | ||
1472 | if (readpos[0] & 0x4) { | |
1473 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
1474 | "to the tape\n"); | |
346331f8 | 1475 | clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); |
1da177e4 LT |
1476 | idetape_end_request(drive, 0, 0); |
1477 | } else { | |
8004a8c9 | 1478 | debug_log(DBG_SENSE, "Block Location - %u\n", |
a2f5b7f4 BP |
1479 | be32_to_cpu(*(u32 *)&readpos[4])); |
1480 | ||
1481 | tape->partition = readpos[1]; | |
54bb2074 | 1482 | tape->first_frame = |
a2f5b7f4 | 1483 | be32_to_cpu(*(u32 *)&readpos[4]); |
346331f8 | 1484 | set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); |
1da177e4 LT |
1485 | idetape_end_request(drive, 1, 0); |
1486 | } | |
1487 | } else { | |
1488 | idetape_end_request(drive, 0, 0); | |
1489 | } | |
1490 | return ide_stopped; | |
1491 | } | |
1492 | ||
1493 | /* | |
3c98bf34 BP |
1494 | * Write a filemark if write_filemark=1. Flush the device buffers without |
1495 | * writing a filemark otherwise. | |
1da177e4 | 1496 | */ |
5a04cfa9 | 1497 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 1498 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 LT |
1499 | { |
1500 | idetape_init_pc(pc); | |
90699ce2 | 1501 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 1502 | pc->c[4] = write_filemark; |
346331f8 | 1503 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
d236d74c | 1504 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1505 | } |
1506 | ||
d236d74c | 1507 | static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1508 | { |
1509 | idetape_init_pc(pc); | |
90699ce2 | 1510 | pc->c[0] = TEST_UNIT_READY; |
d236d74c | 1511 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1512 | } |
1513 | ||
1514 | /* | |
3c98bf34 BP |
1515 | * We add a special packet command request to the tail of the request queue, and |
1516 | * wait for it to be serviced. This is not to be called from within the request | |
1517 | * handling part of the driver! We allocate here data on the stack and it is | |
1518 | * valid until the request is finished. This is not the case for the bottom part | |
1519 | * of the driver, where we are always leaving the functions to wait for an | |
1520 | * interrupt or a timer event. | |
1da177e4 | 1521 | * |
3c98bf34 BP |
1522 | * From the bottom part of the driver, we should allocate safe memory using |
1523 | * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request | |
1524 | * to the request list without waiting for it to be serviced! In that case, we | |
1525 | * usually use idetape_queue_pc_head(). | |
1da177e4 | 1526 | */ |
ea1ab3d3 | 1527 | static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
1528 | { |
1529 | struct ide_tape_obj *tape = drive->driver_data; | |
1530 | struct request rq; | |
1531 | ||
1532 | idetape_init_rq(&rq, REQ_IDETAPE_PC1); | |
1533 | rq.buffer = (char *) pc; | |
1534 | rq.rq_disk = tape->disk; | |
1535 | return ide_do_drive_cmd(drive, &rq, ide_wait); | |
1536 | } | |
1537 | ||
d236d74c BP |
1538 | static void idetape_create_load_unload_cmd(ide_drive_t *drive, |
1539 | struct ide_atapi_pc *pc, int cmd) | |
1da177e4 LT |
1540 | { |
1541 | idetape_init_pc(pc); | |
90699ce2 | 1542 | pc->c[0] = START_STOP; |
1da177e4 | 1543 | pc->c[4] = cmd; |
346331f8 | 1544 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
d236d74c | 1545 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1546 | } |
1547 | ||
1548 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) | |
1549 | { | |
1550 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1551 | struct ide_atapi_pc pc; |
1da177e4 LT |
1552 | int load_attempted = 0; |
1553 | ||
3c98bf34 | 1554 | /* Wait for the tape to become ready */ |
346331f8 | 1555 | set_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); |
1da177e4 LT |
1556 | timeout += jiffies; |
1557 | while (time_before(jiffies, timeout)) { | |
1558 | idetape_create_test_unit_ready_cmd(&pc); | |
ea1ab3d3 | 1559 | if (!idetape_queue_pc_tail(drive, &pc)) |
1da177e4 LT |
1560 | return 0; |
1561 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
1562 | || (tape->asc == 0x3A)) { |
1563 | /* no media */ | |
1da177e4 LT |
1564 | if (load_attempted) |
1565 | return -ENOMEDIUM; | |
5a04cfa9 BP |
1566 | idetape_create_load_unload_cmd(drive, &pc, |
1567 | IDETAPE_LU_LOAD_MASK); | |
ea1ab3d3 | 1568 | idetape_queue_pc_tail(drive, &pc); |
1da177e4 LT |
1569 | load_attempted = 1; |
1570 | /* not about to be ready */ | |
1571 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1572 | (tape->ascq == 1 || tape->ascq == 8))) | |
1573 | return -EIO; | |
80ce45fd | 1574 | msleep(100); |
1da177e4 LT |
1575 | } |
1576 | return -EIO; | |
1577 | } | |
1578 | ||
5a04cfa9 | 1579 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 1580 | { |
d236d74c | 1581 | struct ide_atapi_pc pc; |
1da177e4 LT |
1582 | int rc; |
1583 | ||
1584 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
5a04cfa9 BP |
1585 | rc = idetape_queue_pc_tail(drive, &pc); |
1586 | if (rc) | |
1da177e4 LT |
1587 | return rc; |
1588 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1589 | return 0; | |
1590 | } | |
1591 | ||
d236d74c | 1592 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1593 | { |
1594 | idetape_init_pc(pc); | |
90699ce2 | 1595 | pc->c[0] = READ_POSITION; |
d236d74c BP |
1596 | pc->req_xfer = 20; |
1597 | pc->idetape_callback = &idetape_read_position_callback; | |
1da177e4 LT |
1598 | } |
1599 | ||
5a04cfa9 | 1600 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
1601 | { |
1602 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1603 | struct ide_atapi_pc pc; |
1da177e4 LT |
1604 | int position; |
1605 | ||
8004a8c9 | 1606 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
1607 | |
1608 | idetape_create_read_position_cmd(&pc); | |
1609 | if (idetape_queue_pc_tail(drive, &pc)) | |
1610 | return -1; | |
54bb2074 | 1611 | position = tape->first_frame; |
1da177e4 LT |
1612 | return position; |
1613 | } | |
1614 | ||
d236d74c BP |
1615 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
1616 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1617 | unsigned int block, u8 partition, int skip) |
1da177e4 LT |
1618 | { |
1619 | idetape_init_pc(pc); | |
90699ce2 | 1620 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 1621 | pc->c[1] = 2; |
860ff5ec | 1622 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 1623 | pc->c[8] = partition; |
346331f8 | 1624 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
d236d74c | 1625 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1626 | } |
1627 | ||
d236d74c BP |
1628 | static int idetape_create_prevent_cmd(ide_drive_t *drive, |
1629 | struct ide_atapi_pc *pc, int prevent) | |
1da177e4 LT |
1630 | { |
1631 | idetape_tape_t *tape = drive->driver_data; | |
1632 | ||
b6422013 BP |
1633 | /* device supports locking according to capabilities page */ |
1634 | if (!(tape->caps[6] & 0x01)) | |
1da177e4 LT |
1635 | return 0; |
1636 | ||
1637 | idetape_init_pc(pc); | |
90699ce2 | 1638 | pc->c[0] = ALLOW_MEDIUM_REMOVAL; |
1da177e4 | 1639 | pc->c[4] = prevent; |
d236d74c | 1640 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1641 | return 1; |
1642 | } | |
1643 | ||
ec0fdb01 | 1644 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1645 | { |
1646 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1647 | |
54abf37e | 1648 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 1649 | return; |
1da177e4 | 1650 | |
83042b24 | 1651 | clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags); |
1da177e4 LT |
1652 | tape->merge_stage_size = 0; |
1653 | if (tape->merge_stage != NULL) { | |
d01dbc3b | 1654 | ide_tape_kfree_buffer(tape->merge_stage); |
1da177e4 LT |
1655 | tape->merge_stage = NULL; |
1656 | } | |
1657 | ||
54abf37e | 1658 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1659 | } |
1660 | ||
1661 | /* | |
3c98bf34 BP |
1662 | * Position the tape to the requested block using the LOCATE packet command. |
1663 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1664 | * all higher level operations, we queue the commands at the tail of the request | |
1665 | * queue and wait for their completion. | |
1da177e4 | 1666 | */ |
5a04cfa9 BP |
1667 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
1668 | u8 partition, int skip) | |
1da177e4 LT |
1669 | { |
1670 | idetape_tape_t *tape = drive->driver_data; | |
1671 | int retval; | |
d236d74c | 1672 | struct ide_atapi_pc pc; |
1da177e4 | 1673 | |
54abf37e | 1674 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 1675 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1676 | idetape_wait_ready(drive, 60 * 5 * HZ); |
1677 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
1678 | retval = idetape_queue_pc_tail(drive, &pc); | |
1679 | if (retval) | |
1680 | return (retval); | |
1681 | ||
1682 | idetape_create_read_position_cmd(&pc); | |
1683 | return (idetape_queue_pc_tail(drive, &pc)); | |
1684 | } | |
1685 | ||
ec0fdb01 | 1686 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 1687 | int restore_position) |
1da177e4 LT |
1688 | { |
1689 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1690 | int seek, position; |
1691 | ||
ec0fdb01 | 1692 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1693 | if (restore_position) { |
1694 | position = idetape_read_position(drive); | |
9798630a | 1695 | seek = position > 0 ? position : 0; |
1da177e4 | 1696 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 1697 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 1698 | " %s\n", tape->name, __func__); |
1da177e4 LT |
1699 | return; |
1700 | } | |
1701 | } | |
1702 | } | |
1703 | ||
1704 | /* | |
3c98bf34 BP |
1705 | * Generate a read/write request for the block device interface and wait for it |
1706 | * to be serviced. | |
1da177e4 | 1707 | */ |
5a04cfa9 BP |
1708 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
1709 | struct idetape_bh *bh) | |
1da177e4 LT |
1710 | { |
1711 | idetape_tape_t *tape = drive->driver_data; | |
1712 | struct request rq; | |
1713 | ||
8004a8c9 BP |
1714 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
1715 | ||
1da177e4 LT |
1716 | idetape_init_rq(&rq, cmd); |
1717 | rq.rq_disk = tape->disk; | |
1718 | rq.special = (void *)bh; | |
54bb2074 | 1719 | rq.sector = tape->first_frame; |
5a04cfa9 BP |
1720 | rq.nr_sectors = blocks; |
1721 | rq.current_nr_sectors = blocks; | |
1da177e4 LT |
1722 | (void) ide_do_drive_cmd(drive, &rq, ide_wait); |
1723 | ||
1724 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1725 | return 0; | |
1726 | ||
1727 | if (tape->merge_stage) | |
1728 | idetape_init_merge_stage(tape); | |
1729 | if (rq.errors == IDETAPE_ERROR_GENERAL) | |
1730 | return -EIO; | |
54bb2074 | 1731 | return (tape->blk_size * (blocks-rq.current_nr_sectors)); |
1da177e4 LT |
1732 | } |
1733 | ||
d236d74c | 1734 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1735 | { |
1736 | idetape_init_pc(pc); | |
90699ce2 | 1737 | pc->c[0] = INQUIRY; |
5a04cfa9 | 1738 | pc->c[4] = 254; |
d236d74c BP |
1739 | pc->req_xfer = 254; |
1740 | pc->idetape_callback = &idetape_pc_callback; | |
1da177e4 LT |
1741 | } |
1742 | ||
d236d74c BP |
1743 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
1744 | struct ide_atapi_pc *pc) | |
1da177e4 LT |
1745 | { |
1746 | idetape_init_pc(pc); | |
90699ce2 | 1747 | pc->c[0] = REZERO_UNIT; |
346331f8 | 1748 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
d236d74c | 1749 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1750 | } |
1751 | ||
d236d74c | 1752 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1753 | { |
1754 | idetape_init_pc(pc); | |
90699ce2 | 1755 | pc->c[0] = ERASE; |
1da177e4 | 1756 | pc->c[1] = 1; |
346331f8 | 1757 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
d236d74c | 1758 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1759 | } |
1760 | ||
d236d74c | 1761 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 LT |
1762 | { |
1763 | idetape_init_pc(pc); | |
90699ce2 | 1764 | pc->c[0] = SPACE; |
860ff5ec | 1765 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 1766 | pc->c[1] = cmd; |
346331f8 | 1767 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
d236d74c | 1768 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1769 | } |
1770 | ||
97c566ce | 1771 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 1772 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1773 | { |
1774 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1775 | |
8004a8c9 | 1776 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 1777 | |
0aa4b01e BP |
1778 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
1779 | blocks, tape->merge_stage->bh); | |
1da177e4 LT |
1780 | } |
1781 | ||
5a04cfa9 | 1782 | static void idetape_empty_write_pipeline(ide_drive_t *drive) |
1da177e4 LT |
1783 | { |
1784 | idetape_tape_t *tape = drive->driver_data; | |
1785 | int blocks, min; | |
1786 | struct idetape_bh *bh; | |
55a5d291 | 1787 | |
54abf37e | 1788 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
5a04cfa9 BP |
1789 | printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline," |
1790 | " but we are not writing.\n"); | |
1da177e4 LT |
1791 | return; |
1792 | } | |
f73850a3 | 1793 | if (tape->merge_stage_size > tape->buffer_size) { |
1da177e4 | 1794 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
f73850a3 | 1795 | tape->merge_stage_size = tape->buffer_size; |
1da177e4 | 1796 | } |
1da177e4 | 1797 | if (tape->merge_stage_size) { |
54bb2074 BP |
1798 | blocks = tape->merge_stage_size / tape->blk_size; |
1799 | if (tape->merge_stage_size % tape->blk_size) { | |
1da177e4 LT |
1800 | unsigned int i; |
1801 | ||
1802 | blocks++; | |
54bb2074 BP |
1803 | i = tape->blk_size - tape->merge_stage_size % |
1804 | tape->blk_size; | |
1da177e4 LT |
1805 | bh = tape->bh->b_reqnext; |
1806 | while (bh) { | |
1807 | atomic_set(&bh->b_count, 0); | |
1808 | bh = bh->b_reqnext; | |
1809 | } | |
1810 | bh = tape->bh; | |
1811 | while (i) { | |
1812 | if (bh == NULL) { | |
5a04cfa9 BP |
1813 | printk(KERN_INFO "ide-tape: bug," |
1814 | " bh NULL\n"); | |
1da177e4 LT |
1815 | break; |
1816 | } | |
5a04cfa9 BP |
1817 | min = min(i, (unsigned int)(bh->b_size - |
1818 | atomic_read(&bh->b_count))); | |
1819 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1820 | 0, min); | |
1da177e4 LT |
1821 | atomic_add(min, &bh->b_count); |
1822 | i -= min; | |
1823 | bh = bh->b_reqnext; | |
1824 | } | |
1825 | } | |
1826 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
1827 | tape->merge_stage_size = 0; | |
1828 | } | |
1da177e4 | 1829 | if (tape->merge_stage != NULL) { |
d01dbc3b | 1830 | ide_tape_kfree_buffer(tape->merge_stage); |
1da177e4 LT |
1831 | tape->merge_stage = NULL; |
1832 | } | |
54abf37e | 1833 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1834 | } |
1835 | ||
83042b24 | 1836 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
1837 | { |
1838 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1839 | int bytes_read; |
1da177e4 LT |
1840 | |
1841 | /* Initialize read operation */ | |
54abf37e BP |
1842 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1843 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
1da177e4 LT |
1844 | idetape_empty_write_pipeline(drive); |
1845 | idetape_flush_tape_buffers(drive); | |
1846 | } | |
1da177e4 | 1847 | if (tape->merge_stage || tape->merge_stage_size) { |
5a04cfa9 BP |
1848 | printk(KERN_ERR "ide-tape: merge_stage_size should be" |
1849 | " 0 now\n"); | |
1da177e4 LT |
1850 | tape->merge_stage_size = 0; |
1851 | } | |
41aa1706 | 1852 | tape->merge_stage = ide_tape_kmalloc_buffer(tape, 0, 0); |
5a04cfa9 | 1853 | if (!tape->merge_stage) |
1da177e4 | 1854 | return -ENOMEM; |
54abf37e | 1855 | tape->chrdev_dir = IDETAPE_DIR_READ; |
1da177e4 LT |
1856 | |
1857 | /* | |
3c98bf34 BP |
1858 | * Issue a read 0 command to ensure that DSC handshake is |
1859 | * switched from completion mode to buffer available mode. | |
1860 | * No point in issuing this if DSC overlap isn't supported, some | |
1861 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1862 | */ |
1863 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1864 | bytes_read = idetape_queue_rw_tail(drive, |
1865 | REQ_IDETAPE_READ, 0, | |
1866 | tape->merge_stage->bh); | |
1da177e4 | 1867 | if (bytes_read < 0) { |
d01dbc3b | 1868 | ide_tape_kfree_buffer(tape->merge_stage); |
1da177e4 | 1869 | tape->merge_stage = NULL; |
54abf37e | 1870 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1871 | return bytes_read; |
1872 | } | |
1873 | } | |
1874 | } | |
5e69bd95 | 1875 | |
1da177e4 LT |
1876 | return 0; |
1877 | } | |
1878 | ||
5bd50dc6 | 1879 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1880 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1881 | { |
1882 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1883 | |
8004a8c9 | 1884 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1885 | |
3c98bf34 | 1886 | /* If we are at a filemark, return a read length of 0 */ |
346331f8 | 1887 | if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
1da177e4 LT |
1888 | return 0; |
1889 | ||
83042b24 | 1890 | idetape_init_read(drive); |
5e69bd95 | 1891 | |
5e69bd95 BP |
1892 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
1893 | tape->merge_stage->bh); | |
1da177e4 LT |
1894 | } |
1895 | ||
5a04cfa9 | 1896 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1897 | { |
1898 | idetape_tape_t *tape = drive->driver_data; | |
1899 | struct idetape_bh *bh; | |
1900 | int blocks; | |
3c98bf34 | 1901 | |
1da177e4 LT |
1902 | while (bcount) { |
1903 | unsigned int count; | |
1904 | ||
1905 | bh = tape->merge_stage->bh; | |
f73850a3 | 1906 | count = min(tape->buffer_size, bcount); |
1da177e4 | 1907 | bcount -= count; |
54bb2074 | 1908 | blocks = count / tape->blk_size; |
1da177e4 | 1909 | while (count) { |
5a04cfa9 BP |
1910 | atomic_set(&bh->b_count, |
1911 | min(count, (unsigned int)bh->b_size)); | |
1da177e4 LT |
1912 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
1913 | count -= atomic_read(&bh->b_count); | |
1914 | bh = bh->b_reqnext; | |
1915 | } | |
5a04cfa9 BP |
1916 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
1917 | tape->merge_stage->bh); | |
1da177e4 LT |
1918 | } |
1919 | } | |
1920 | ||
1da177e4 | 1921 | /* |
3c98bf34 BP |
1922 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1923 | * currently support only one partition. | |
1924 | */ | |
5a04cfa9 | 1925 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 LT |
1926 | { |
1927 | int retval; | |
d236d74c | 1928 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1929 | idetape_tape_t *tape; |
1930 | tape = drive->driver_data; | |
1931 | ||
1932 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1933 | ||
1da177e4 LT |
1934 | idetape_create_rewind_cmd(drive, &pc); |
1935 | retval = idetape_queue_pc_tail(drive, &pc); | |
1936 | if (retval) | |
1937 | return retval; | |
1938 | ||
1939 | idetape_create_read_position_cmd(&pc); | |
1940 | retval = idetape_queue_pc_tail(drive, &pc); | |
1941 | if (retval) | |
1942 | return retval; | |
1943 | return 0; | |
1944 | } | |
1945 | ||
3c98bf34 | 1946 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1947 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1948 | unsigned long arg) | |
1da177e4 LT |
1949 | { |
1950 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1951 | void __user *argp = (void __user *)arg; |
1952 | ||
d59823fa BP |
1953 | struct idetape_config { |
1954 | int dsc_rw_frequency; | |
1955 | int dsc_media_access_frequency; | |
1956 | int nr_stages; | |
1957 | } config; | |
1958 | ||
8004a8c9 BP |
1959 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1960 | ||
1da177e4 | 1961 | switch (cmd) { |
5a04cfa9 BP |
1962 | case 0x0340: |
1963 | if (copy_from_user(&config, argp, sizeof(config))) | |
1964 | return -EFAULT; | |
1965 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1966 | break; |
1967 | case 0x0350: | |
1968 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1969 | config.nr_stages = 1; |
5a04cfa9 BP |
1970 | if (copy_to_user(argp, &config, sizeof(config))) |
1971 | return -EFAULT; | |
1972 | break; | |
1973 | default: | |
1974 | return -EIO; | |
1da177e4 LT |
1975 | } |
1976 | return 0; | |
1977 | } | |
1978 | ||
5a04cfa9 BP |
1979 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1980 | int mt_count) | |
1da177e4 LT |
1981 | { |
1982 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1983 | struct ide_atapi_pc pc; |
5a04cfa9 | 1984 | int retval, count = 0; |
b6422013 | 1985 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1986 | |
1987 | if (mt_count == 0) | |
1988 | return 0; | |
1989 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1990 | if (!sprev) |
1da177e4 | 1991 | return -EIO; |
5a04cfa9 | 1992 | mt_count = -mt_count; |
1da177e4 LT |
1993 | } |
1994 | ||
54abf37e | 1995 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 1996 | tape->merge_stage_size = 0; |
346331f8 | 1997 | if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
1da177e4 | 1998 | ++count; |
ec0fdb01 | 1999 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
2000 | } |
2001 | ||
2002 | /* | |
3c98bf34 BP |
2003 | * The filemark was not found in our internal pipeline; now we can issue |
2004 | * the space command. | |
1da177e4 LT |
2005 | */ |
2006 | switch (mt_op) { | |
5a04cfa9 BP |
2007 | case MTFSF: |
2008 | case MTBSF: | |
2009 | idetape_create_space_cmd(&pc, mt_count - count, | |
2010 | IDETAPE_SPACE_OVER_FILEMARK); | |
2011 | return idetape_queue_pc_tail(drive, &pc); | |
2012 | case MTFSFM: | |
2013 | case MTBSFM: | |
2014 | if (!sprev) | |
2015 | return -EIO; | |
2016 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
2017 | mt_count - count); | |
2018 | if (retval) | |
2019 | return retval; | |
2020 | count = (MTBSFM == mt_op ? 1 : -1); | |
2021 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
2022 | default: | |
2023 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
2024 | mt_op); | |
2025 | return -EIO; | |
1da177e4 LT |
2026 | } |
2027 | } | |
2028 | ||
1da177e4 | 2029 | /* |
3c98bf34 | 2030 | * Our character device read / write functions. |
1da177e4 | 2031 | * |
3c98bf34 BP |
2032 | * The tape is optimized to maximize throughput when it is transferring an |
2033 | * integral number of the "continuous transfer limit", which is a parameter of | |
2034 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 2035 | * |
3c98bf34 BP |
2036 | * As of version 1.3 of the driver, the character device provides an abstract |
2037 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
2038 | * same backup/restore procedure is supported. The driver will internally | |
2039 | * convert the requests to the recommended transfer unit, so that an unmatch | |
2040 | * between the user's block size to the recommended size will only result in a | |
2041 | * (slightly) increased driver overhead, but will no longer hit performance. | |
2042 | * This is not applicable to Onstream. | |
1da177e4 | 2043 | */ |
5a04cfa9 BP |
2044 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
2045 | size_t count, loff_t *ppos) | |
1da177e4 LT |
2046 | { |
2047 | struct ide_tape_obj *tape = ide_tape_f(file); | |
2048 | ide_drive_t *drive = tape->drive; | |
5a04cfa9 | 2049 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 2050 | ssize_t ret = 0; |
b6422013 | 2051 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 2052 | |
8004a8c9 | 2053 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 2054 | |
54abf37e | 2055 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
346331f8 | 2056 | if (test_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags)) |
54bb2074 BP |
2057 | if (count > tape->blk_size && |
2058 | (count % tape->blk_size) == 0) | |
2059 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 2060 | } |
83042b24 | 2061 | rc = idetape_init_read(drive); |
8d06bfad | 2062 | if (rc < 0) |
1da177e4 LT |
2063 | return rc; |
2064 | if (count == 0) | |
2065 | return (0); | |
2066 | if (tape->merge_stage_size) { | |
5a04cfa9 BP |
2067 | actually_read = min((unsigned int)(tape->merge_stage_size), |
2068 | (unsigned int)count); | |
99d74e61 | 2069 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
dcd96379 | 2070 | ret = -EFAULT; |
1da177e4 LT |
2071 | buf += actually_read; |
2072 | tape->merge_stage_size -= actually_read; | |
2073 | count -= actually_read; | |
2074 | } | |
f73850a3 | 2075 | while (count >= tape->buffer_size) { |
b6422013 | 2076 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
2077 | if (bytes_read <= 0) |
2078 | goto finish; | |
99d74e61 | 2079 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
dcd96379 | 2080 | ret = -EFAULT; |
1da177e4 LT |
2081 | buf += bytes_read; |
2082 | count -= bytes_read; | |
2083 | actually_read += bytes_read; | |
2084 | } | |
2085 | if (count) { | |
b6422013 | 2086 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
2087 | if (bytes_read <= 0) |
2088 | goto finish; | |
2089 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
99d74e61 | 2090 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
dcd96379 | 2091 | ret = -EFAULT; |
1da177e4 LT |
2092 | actually_read += temp; |
2093 | tape->merge_stage_size = bytes_read-temp; | |
2094 | } | |
2095 | finish: | |
346331f8 | 2096 | if (!actually_read && test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) { |
8004a8c9 BP |
2097 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
2098 | ||
1da177e4 LT |
2099 | idetape_space_over_filemarks(drive, MTFSF, 1); |
2100 | return 0; | |
2101 | } | |
dcd96379 | 2102 | |
5a04cfa9 | 2103 | return ret ? ret : actually_read; |
1da177e4 LT |
2104 | } |
2105 | ||
5a04cfa9 | 2106 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
2107 | size_t count, loff_t *ppos) |
2108 | { | |
2109 | struct ide_tape_obj *tape = ide_tape_f(file); | |
2110 | ide_drive_t *drive = tape->drive; | |
dcd96379 DW |
2111 | ssize_t actually_written = 0; |
2112 | ssize_t ret = 0; | |
b6422013 | 2113 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
2114 | |
2115 | /* The drive is write protected. */ | |
2116 | if (tape->write_prot) | |
2117 | return -EACCES; | |
2118 | ||
8004a8c9 | 2119 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
2120 | |
2121 | /* Initialize write operation */ | |
54abf37e BP |
2122 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
2123 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 2124 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 LT |
2125 | if (tape->merge_stage || tape->merge_stage_size) { |
2126 | printk(KERN_ERR "ide-tape: merge_stage_size " | |
2127 | "should be 0 now\n"); | |
2128 | tape->merge_stage_size = 0; | |
2129 | } | |
41aa1706 | 2130 | tape->merge_stage = ide_tape_kmalloc_buffer(tape, 0, 0); |
5a04cfa9 | 2131 | if (!tape->merge_stage) |
1da177e4 | 2132 | return -ENOMEM; |
54abf37e | 2133 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
1da177e4 LT |
2134 | idetape_init_merge_stage(tape); |
2135 | ||
2136 | /* | |
3c98bf34 BP |
2137 | * Issue a write 0 command to ensure that DSC handshake is |
2138 | * switched from completion mode to buffer available mode. No | |
2139 | * point in issuing this if DSC overlap isn't supported, some | |
2140 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
2141 | */ |
2142 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
2143 | ssize_t retval = idetape_queue_rw_tail(drive, |
2144 | REQ_IDETAPE_WRITE, 0, | |
2145 | tape->merge_stage->bh); | |
1da177e4 | 2146 | if (retval < 0) { |
d01dbc3b | 2147 | ide_tape_kfree_buffer(tape->merge_stage); |
1da177e4 | 2148 | tape->merge_stage = NULL; |
54abf37e | 2149 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
2150 | return retval; |
2151 | } | |
2152 | } | |
2153 | } | |
2154 | if (count == 0) | |
2155 | return (0); | |
1da177e4 | 2156 | if (tape->merge_stage_size) { |
f73850a3 | 2157 | if (tape->merge_stage_size >= tape->buffer_size) { |
5a04cfa9 | 2158 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
1da177e4 LT |
2159 | tape->merge_stage_size = 0; |
2160 | } | |
5a04cfa9 | 2161 | actually_written = min((unsigned int) |
f73850a3 | 2162 | (tape->buffer_size - tape->merge_stage_size), |
5a04cfa9 | 2163 | (unsigned int)count); |
8646c88f | 2164 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
dcd96379 | 2165 | ret = -EFAULT; |
1da177e4 LT |
2166 | buf += actually_written; |
2167 | tape->merge_stage_size += actually_written; | |
2168 | count -= actually_written; | |
2169 | ||
f73850a3 | 2170 | if (tape->merge_stage_size == tape->buffer_size) { |
dcd96379 | 2171 | ssize_t retval; |
1da177e4 | 2172 | tape->merge_stage_size = 0; |
b6422013 | 2173 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
2174 | if (retval <= 0) |
2175 | return (retval); | |
2176 | } | |
2177 | } | |
f73850a3 | 2178 | while (count >= tape->buffer_size) { |
dcd96379 | 2179 | ssize_t retval; |
f73850a3 | 2180 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
dcd96379 | 2181 | ret = -EFAULT; |
f73850a3 BP |
2182 | buf += tape->buffer_size; |
2183 | count -= tape->buffer_size; | |
b6422013 | 2184 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 2185 | actually_written += tape->buffer_size; |
1da177e4 LT |
2186 | if (retval <= 0) |
2187 | return (retval); | |
2188 | } | |
2189 | if (count) { | |
2190 | actually_written += count; | |
8646c88f | 2191 | if (idetape_copy_stage_from_user(tape, buf, count)) |
dcd96379 | 2192 | ret = -EFAULT; |
1da177e4 LT |
2193 | tape->merge_stage_size += count; |
2194 | } | |
5a04cfa9 | 2195 | return ret ? ret : actually_written; |
1da177e4 LT |
2196 | } |
2197 | ||
5a04cfa9 | 2198 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 2199 | { |
d236d74c | 2200 | struct ide_atapi_pc pc; |
1da177e4 LT |
2201 | |
2202 | /* Write a filemark */ | |
2203 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
2204 | if (idetape_queue_pc_tail(drive, &pc)) { | |
2205 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); | |
2206 | return -EIO; | |
2207 | } | |
2208 | return 0; | |
2209 | } | |
2210 | ||
2211 | /* | |
d99c9da2 BP |
2212 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
2213 | * requested. | |
1da177e4 | 2214 | * |
d99c9da2 BP |
2215 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
2216 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 2217 | * usually not supported. |
1da177e4 | 2218 | * |
d99c9da2 | 2219 | * The following commands are currently not supported: |
1da177e4 | 2220 | * |
d99c9da2 BP |
2221 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
2222 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 2223 | */ |
d99c9da2 | 2224 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
2225 | { |
2226 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2227 | struct ide_atapi_pc pc; |
5a04cfa9 | 2228 | int i, retval; |
1da177e4 | 2229 | |
8004a8c9 BP |
2230 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
2231 | mt_op, mt_count); | |
5a04cfa9 | 2232 | |
1da177e4 | 2233 | switch (mt_op) { |
5a04cfa9 BP |
2234 | case MTFSF: |
2235 | case MTFSFM: | |
2236 | case MTBSF: | |
2237 | case MTBSFM: | |
2238 | if (!mt_count) | |
2239 | return 0; | |
2240 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
2241 | default: | |
2242 | break; | |
1da177e4 | 2243 | } |
5a04cfa9 | 2244 | |
1da177e4 | 2245 | switch (mt_op) { |
5a04cfa9 BP |
2246 | case MTWEOF: |
2247 | if (tape->write_prot) | |
2248 | return -EACCES; | |
ec0fdb01 | 2249 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
2250 | for (i = 0; i < mt_count; i++) { |
2251 | retval = idetape_write_filemark(drive); | |
2252 | if (retval) | |
2253 | return retval; | |
2254 | } | |
2255 | return 0; | |
2256 | case MTREW: | |
ec0fdb01 | 2257 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2258 | if (idetape_rewind_tape(drive)) |
2259 | return -EIO; | |
2260 | return 0; | |
2261 | case MTLOAD: | |
ec0fdb01 | 2262 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2263 | idetape_create_load_unload_cmd(drive, &pc, |
2264 | IDETAPE_LU_LOAD_MASK); | |
2265 | return idetape_queue_pc_tail(drive, &pc); | |
2266 | case MTUNLOAD: | |
2267 | case MTOFFL: | |
2268 | /* | |
2269 | * If door is locked, attempt to unlock before | |
2270 | * attempting to eject. | |
2271 | */ | |
2272 | if (tape->door_locked) { | |
2273 | if (idetape_create_prevent_cmd(drive, &pc, 0)) | |
2274 | if (!idetape_queue_pc_tail(drive, &pc)) | |
2275 | tape->door_locked = DOOR_UNLOCKED; | |
2276 | } | |
ec0fdb01 | 2277 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2278 | idetape_create_load_unload_cmd(drive, &pc, |
2279 | !IDETAPE_LU_LOAD_MASK); | |
2280 | retval = idetape_queue_pc_tail(drive, &pc); | |
2281 | if (!retval) | |
346331f8 | 2282 | clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); |
5a04cfa9 BP |
2283 | return retval; |
2284 | case MTNOP: | |
ec0fdb01 | 2285 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2286 | return idetape_flush_tape_buffers(drive); |
2287 | case MTRETEN: | |
ec0fdb01 | 2288 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2289 | idetape_create_load_unload_cmd(drive, &pc, |
2290 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); | |
2291 | return idetape_queue_pc_tail(drive, &pc); | |
2292 | case MTEOM: | |
2293 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
2294 | return idetape_queue_pc_tail(drive, &pc); | |
2295 | case MTERASE: | |
2296 | (void)idetape_rewind_tape(drive); | |
2297 | idetape_create_erase_cmd(&pc); | |
2298 | return idetape_queue_pc_tail(drive, &pc); | |
2299 | case MTSETBLK: | |
2300 | if (mt_count) { | |
2301 | if (mt_count < tape->blk_size || | |
2302 | mt_count % tape->blk_size) | |
1da177e4 | 2303 | return -EIO; |
5a04cfa9 | 2304 | tape->user_bs_factor = mt_count / tape->blk_size; |
346331f8 | 2305 | clear_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); |
5a04cfa9 | 2306 | } else |
346331f8 | 2307 | set_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); |
5a04cfa9 BP |
2308 | return 0; |
2309 | case MTSEEK: | |
ec0fdb01 | 2310 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2311 | return idetape_position_tape(drive, |
2312 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
2313 | case MTSETPART: | |
ec0fdb01 | 2314 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2315 | return idetape_position_tape(drive, 0, mt_count, 0); |
2316 | case MTFSR: | |
2317 | case MTBSR: | |
2318 | case MTLOCK: | |
2319 | if (!idetape_create_prevent_cmd(drive, &pc, 1)) | |
1da177e4 | 2320 | return 0; |
5a04cfa9 BP |
2321 | retval = idetape_queue_pc_tail(drive, &pc); |
2322 | if (retval) | |
1da177e4 | 2323 | return retval; |
5a04cfa9 BP |
2324 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
2325 | return 0; | |
2326 | case MTUNLOCK: | |
2327 | if (!idetape_create_prevent_cmd(drive, &pc, 0)) | |
1da177e4 | 2328 | return 0; |
5a04cfa9 BP |
2329 | retval = idetape_queue_pc_tail(drive, &pc); |
2330 | if (retval) | |
2331 | return retval; | |
2332 | tape->door_locked = DOOR_UNLOCKED; | |
2333 | return 0; | |
2334 | default: | |
2335 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
2336 | mt_op); | |
2337 | return -EIO; | |
1da177e4 LT |
2338 | } |
2339 | } | |
2340 | ||
2341 | /* | |
d99c9da2 BP |
2342 | * Our character device ioctls. General mtio.h magnetic io commands are |
2343 | * supported here, and not in the corresponding block interface. Our own | |
2344 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 2345 | */ |
d99c9da2 BP |
2346 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
2347 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
2348 | { |
2349 | struct ide_tape_obj *tape = ide_tape_f(file); | |
2350 | ide_drive_t *drive = tape->drive; | |
2351 | struct mtop mtop; | |
2352 | struct mtget mtget; | |
2353 | struct mtpos mtpos; | |
54bb2074 | 2354 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
2355 | void __user *argp = (void __user *)arg; |
2356 | ||
8004a8c9 | 2357 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 2358 | |
54abf37e | 2359 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
1da177e4 LT |
2360 | idetape_empty_write_pipeline(drive); |
2361 | idetape_flush_tape_buffers(drive); | |
2362 | } | |
2363 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
b361acb1 | 2364 | block_offset = tape->merge_stage_size / |
54bb2074 | 2365 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
2366 | position = idetape_read_position(drive); |
2367 | if (position < 0) | |
1da177e4 LT |
2368 | return -EIO; |
2369 | } | |
2370 | switch (cmd) { | |
5a04cfa9 BP |
2371 | case MTIOCTOP: |
2372 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
2373 | return -EFAULT; | |
2374 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
2375 | case MTIOCGET: | |
2376 | memset(&mtget, 0, sizeof(struct mtget)); | |
2377 | mtget.mt_type = MT_ISSCSI2; | |
2378 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2379 | mtget.mt_dsreg = | |
2380 | ((tape->blk_size * tape->user_bs_factor) | |
2381 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
2382 | ||
2383 | if (tape->drv_write_prot) | |
2384 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
2385 | ||
2386 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
2387 | return -EFAULT; | |
2388 | return 0; | |
2389 | case MTIOCPOS: | |
2390 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2391 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
2392 | return -EFAULT; | |
2393 | return 0; | |
2394 | default: | |
2395 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 2396 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 2397 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
2398 | } |
2399 | } | |
2400 | ||
3cffb9ce BP |
2401 | /* |
2402 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
2403 | * block size with the reported value. | |
2404 | */ | |
2405 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
2406 | { | |
2407 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2408 | struct ide_atapi_pc pc; |
3cffb9ce BP |
2409 | |
2410 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2411 | if (idetape_queue_pc_tail(drive, &pc)) { | |
2412 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); | |
54bb2074 | 2413 | if (tape->blk_size == 0) { |
3cffb9ce BP |
2414 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
2415 | "block size, assuming 32k\n"); | |
54bb2074 | 2416 | tape->blk_size = 32768; |
3cffb9ce BP |
2417 | } |
2418 | return; | |
2419 | } | |
d236d74c BP |
2420 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
2421 | (pc.buf[4 + 6] << 8) + | |
2422 | pc.buf[4 + 7]; | |
2423 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 2424 | } |
1da177e4 | 2425 | |
5a04cfa9 | 2426 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
2427 | { |
2428 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
2429 | ide_drive_t *drive; | |
2430 | idetape_tape_t *tape; | |
d236d74c | 2431 | struct ide_atapi_pc pc; |
1da177e4 LT |
2432 | int retval; |
2433 | ||
8004a8c9 BP |
2434 | if (i >= MAX_HWIFS * MAX_DRIVES) |
2435 | return -ENXIO; | |
2436 | ||
2437 | tape = ide_tape_chrdev_get(i); | |
2438 | if (!tape) | |
2439 | return -ENXIO; | |
2440 | ||
2441 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
2442 | ||
1da177e4 LT |
2443 | /* |
2444 | * We really want to do nonseekable_open(inode, filp); here, but some | |
2445 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
2446 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
2447 | */ | |
2448 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
2449 | ||
1da177e4 LT |
2450 | drive = tape->drive; |
2451 | ||
2452 | filp->private_data = tape; | |
2453 | ||
346331f8 | 2454 | if (test_and_set_bit(IDETAPE_FLAG_BUSY, &tape->flags)) { |
1da177e4 LT |
2455 | retval = -EBUSY; |
2456 | goto out_put_tape; | |
2457 | } | |
2458 | ||
2459 | retval = idetape_wait_ready(drive, 60 * HZ); | |
2460 | if (retval) { | |
346331f8 | 2461 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
1da177e4 LT |
2462 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
2463 | goto out_put_tape; | |
2464 | } | |
2465 | ||
2466 | idetape_read_position(drive); | |
346331f8 | 2467 | if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags)) |
1da177e4 LT |
2468 | (void)idetape_rewind_tape(drive); |
2469 | ||
1da177e4 | 2470 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 2471 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
2472 | |
2473 | /* Set write protect flag if device is opened as read-only. */ | |
2474 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
2475 | tape->write_prot = 1; | |
2476 | else | |
2477 | tape->write_prot = tape->drv_write_prot; | |
2478 | ||
2479 | /* Make sure drive isn't write protected if user wants to write. */ | |
2480 | if (tape->write_prot) { | |
2481 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
2482 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
346331f8 | 2483 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
1da177e4 LT |
2484 | retval = -EROFS; |
2485 | goto out_put_tape; | |
2486 | } | |
2487 | } | |
2488 | ||
3c98bf34 | 2489 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 2490 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 LT |
2491 | if (idetape_create_prevent_cmd(drive, &pc, 1)) { |
2492 | if (!idetape_queue_pc_tail(drive, &pc)) { | |
2493 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) | |
2494 | tape->door_locked = DOOR_LOCKED; | |
2495 | } | |
2496 | } | |
2497 | } | |
1da177e4 LT |
2498 | return 0; |
2499 | ||
2500 | out_put_tape: | |
2501 | ide_tape_put(tape); | |
2502 | return retval; | |
2503 | } | |
2504 | ||
5a04cfa9 | 2505 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
2506 | { |
2507 | idetape_tape_t *tape = drive->driver_data; | |
2508 | ||
2509 | idetape_empty_write_pipeline(drive); | |
41aa1706 | 2510 | tape->merge_stage = ide_tape_kmalloc_buffer(tape, 1, 0); |
1da177e4 | 2511 | if (tape->merge_stage != NULL) { |
54bb2074 BP |
2512 | idetape_pad_zeros(drive, tape->blk_size * |
2513 | (tape->user_bs_factor - 1)); | |
d01dbc3b | 2514 | ide_tape_kfree_buffer(tape->merge_stage); |
1da177e4 LT |
2515 | tape->merge_stage = NULL; |
2516 | } | |
2517 | idetape_write_filemark(drive); | |
2518 | idetape_flush_tape_buffers(drive); | |
2519 | idetape_flush_tape_buffers(drive); | |
2520 | } | |
2521 | ||
5a04cfa9 | 2522 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 LT |
2523 | { |
2524 | struct ide_tape_obj *tape = ide_tape_f(filp); | |
2525 | ide_drive_t *drive = tape->drive; | |
d236d74c | 2526 | struct ide_atapi_pc pc; |
1da177e4 LT |
2527 | unsigned int minor = iminor(inode); |
2528 | ||
2529 | lock_kernel(); | |
2530 | tape = drive->driver_data; | |
8004a8c9 BP |
2531 | |
2532 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 2533 | |
54abf37e | 2534 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 2535 | idetape_write_release(drive, minor); |
54abf37e | 2536 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 2537 | if (minor < 128) |
ec0fdb01 | 2538 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 2539 | } |
f64eee7b | 2540 | |
346331f8 | 2541 | if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags)) |
1da177e4 | 2542 | (void) idetape_rewind_tape(drive); |
54abf37e | 2543 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 LT |
2544 | if (tape->door_locked == DOOR_LOCKED) { |
2545 | if (idetape_create_prevent_cmd(drive, &pc, 0)) { | |
2546 | if (!idetape_queue_pc_tail(drive, &pc)) | |
2547 | tape->door_locked = DOOR_UNLOCKED; | |
2548 | } | |
2549 | } | |
2550 | } | |
346331f8 | 2551 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
1da177e4 LT |
2552 | ide_tape_put(tape); |
2553 | unlock_kernel(); | |
2554 | return 0; | |
2555 | } | |
2556 | ||
2557 | /* | |
71071b8e | 2558 | * check the contents of the ATAPI IDENTIFY command results. We return: |
1da177e4 | 2559 | * |
71071b8e BP |
2560 | * 1 - If the tape can be supported by us, based on the information we have so |
2561 | * far. | |
1da177e4 | 2562 | * |
71071b8e | 2563 | * 0 - If this tape driver is not currently supported by us. |
1da177e4 | 2564 | */ |
71071b8e | 2565 | static int idetape_identify_device(ide_drive_t *drive) |
1da177e4 | 2566 | { |
71071b8e | 2567 | u8 gcw[2], protocol, device_type, removable, packet_size; |
1da177e4 LT |
2568 | |
2569 | if (drive->id_read == 0) | |
2570 | return 1; | |
2571 | ||
71071b8e | 2572 | *((unsigned short *) &gcw) = drive->id->config; |
1da177e4 | 2573 | |
71071b8e BP |
2574 | protocol = (gcw[1] & 0xC0) >> 6; |
2575 | device_type = gcw[1] & 0x1F; | |
2576 | removable = !!(gcw[0] & 0x80); | |
2577 | packet_size = gcw[0] & 0x3; | |
1da177e4 | 2578 | |
71071b8e BP |
2579 | /* Check that we can support this device */ |
2580 | if (protocol != 2) | |
16422de3 | 2581 | printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n", |
71071b8e BP |
2582 | protocol); |
2583 | else if (device_type != 1) | |
16422de3 | 2584 | printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set " |
71071b8e BP |
2585 | "to tape\n", device_type); |
2586 | else if (!removable) | |
1da177e4 | 2587 | printk(KERN_ERR "ide-tape: The removable flag is not set\n"); |
71071b8e | 2588 | else if (packet_size != 0) { |
24d57f8b BP |
2589 | printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12" |
2590 | " bytes\n", packet_size); | |
1da177e4 LT |
2591 | } else |
2592 | return 1; | |
2593 | return 0; | |
2594 | } | |
2595 | ||
6d29c8f0 | 2596 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 2597 | { |
1da177e4 | 2598 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 2599 | struct ide_atapi_pc pc; |
41f81d54 | 2600 | char fw_rev[6], vendor_id[10], product_id[18]; |
6d29c8f0 | 2601 | |
1da177e4 LT |
2602 | idetape_create_inquiry_cmd(&pc); |
2603 | if (idetape_queue_pc_tail(drive, &pc)) { | |
6d29c8f0 BP |
2604 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
2605 | tape->name); | |
1da177e4 LT |
2606 | return; |
2607 | } | |
d236d74c BP |
2608 | memcpy(vendor_id, &pc.buf[8], 8); |
2609 | memcpy(product_id, &pc.buf[16], 16); | |
2610 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 BP |
2611 | |
2612 | ide_fixstring(vendor_id, 10, 0); | |
2613 | ide_fixstring(product_id, 18, 0); | |
2614 | ide_fixstring(fw_rev, 6, 0); | |
2615 | ||
6d29c8f0 | 2616 | printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", |
41f81d54 | 2617 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
2618 | } |
2619 | ||
2620 | /* | |
b6422013 BP |
2621 | * Ask the tape about its various parameters. In particular, we will adjust our |
2622 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 2623 | */ |
5a04cfa9 | 2624 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
2625 | { |
2626 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2627 | struct ide_atapi_pc pc; |
b6422013 BP |
2628 | u8 *caps; |
2629 | u8 speed, max_speed; | |
47314fa4 | 2630 | |
1da177e4 LT |
2631 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2632 | if (idetape_queue_pc_tail(drive, &pc)) { | |
b6422013 BP |
2633 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
2634 | " some default values\n"); | |
54bb2074 | 2635 | tape->blk_size = 512; |
b6422013 BP |
2636 | put_unaligned(52, (u16 *)&tape->caps[12]); |
2637 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2638 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
2639 | return; |
2640 | } | |
d236d74c | 2641 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
2642 | |
2643 | /* convert to host order and save for later use */ | |
2644 | speed = be16_to_cpu(*(u16 *)&caps[14]); | |
2645 | max_speed = be16_to_cpu(*(u16 *)&caps[8]); | |
1da177e4 | 2646 | |
b6422013 BP |
2647 | put_unaligned(max_speed, (u16 *)&caps[8]); |
2648 | put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]); | |
2649 | put_unaligned(speed, (u16 *)&caps[14]); | |
2650 | put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]); | |
1da177e4 | 2651 | |
b6422013 BP |
2652 | if (!speed) { |
2653 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2654 | "(assuming 650KB/sec)\n", drive->name); | |
2655 | put_unaligned(650, (u16 *)&caps[14]); | |
1da177e4 | 2656 | } |
b6422013 BP |
2657 | if (!max_speed) { |
2658 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2659 | "(assuming 650KB/sec)\n", drive->name); | |
2660 | put_unaligned(650, (u16 *)&caps[8]); | |
1da177e4 LT |
2661 | } |
2662 | ||
b6422013 BP |
2663 | memcpy(&tape->caps, caps, 20); |
2664 | if (caps[7] & 0x02) | |
54bb2074 | 2665 | tape->blk_size = 512; |
b6422013 | 2666 | else if (caps[7] & 0x04) |
54bb2074 | 2667 | tape->blk_size = 1024; |
1da177e4 LT |
2668 | } |
2669 | ||
7662d046 | 2670 | #ifdef CONFIG_IDE_PROC_FS |
5a04cfa9 | 2671 | static void idetape_add_settings(ide_drive_t *drive) |
1da177e4 LT |
2672 | { |
2673 | idetape_tape_t *tape = drive->driver_data; | |
2674 | ||
b6422013 BP |
2675 | ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
2676 | 1, 2, (u16 *)&tape->caps[16], NULL); | |
b6422013 BP |
2677 | ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
2678 | 1, 1, (u16 *)&tape->caps[14], NULL); | |
f73850a3 BP |
2679 | ide_add_setting(drive, "buffer_size", SETTING_READ, TYPE_INT, 0, 0xffff, |
2680 | 1, 1024, &tape->buffer_size, NULL); | |
54bb2074 BP |
2681 | ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, |
2682 | IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq, | |
2683 | NULL); | |
5a04cfa9 BP |
2684 | ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, |
2685 | 1, &drive->dsc_overlap, NULL); | |
5a04cfa9 BP |
2686 | ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, |
2687 | 1, 1, &tape->avg_speed, NULL); | |
8004a8c9 BP |
2688 | ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1, |
2689 | 1, &tape->debug_mask, NULL); | |
1da177e4 | 2690 | } |
7662d046 BZ |
2691 | #else |
2692 | static inline void idetape_add_settings(ide_drive_t *drive) { ; } | |
2693 | #endif | |
1da177e4 LT |
2694 | |
2695 | /* | |
3c98bf34 | 2696 | * The function below is called to: |
1da177e4 | 2697 | * |
3c98bf34 BP |
2698 | * 1. Initialize our various state variables. |
2699 | * 2. Ask the tape for its capabilities. | |
2700 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2701 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 2702 | * |
3c98bf34 BP |
2703 | * Note that at this point ide.c already assigned us an irq, so that we can |
2704 | * queue requests here and wait for their completion. | |
1da177e4 | 2705 | */ |
5a04cfa9 | 2706 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 2707 | { |
83042b24 | 2708 | unsigned long t; |
1da177e4 | 2709 | int speed; |
f73850a3 | 2710 | int buffer_size; |
71071b8e | 2711 | u8 gcw[2]; |
b6422013 | 2712 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 2713 | |
54bb2074 | 2714 | spin_lock_init(&tape->lock); |
1da177e4 | 2715 | drive->dsc_overlap = 1; |
4166c199 BZ |
2716 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
2717 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2718 | tape->name); | |
2719 | drive->dsc_overlap = 0; | |
1da177e4 | 2720 | } |
1da177e4 LT |
2721 | /* Seagate Travan drives do not support DSC overlap. */ |
2722 | if (strstr(drive->id->model, "Seagate STT3401")) | |
2723 | drive->dsc_overlap = 0; | |
2724 | tape->minor = minor; | |
2725 | tape->name[0] = 'h'; | |
2726 | tape->name[1] = 't'; | |
2727 | tape->name[2] = '0' + minor; | |
54abf37e | 2728 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 | 2729 | tape->pc = tape->pc_stack; |
1da177e4 | 2730 | *((unsigned short *) &gcw) = drive->id->config; |
71071b8e BP |
2731 | |
2732 | /* Command packet DRQ type */ | |
2733 | if (((gcw[0] & 0x60) >> 5) == 1) | |
346331f8 | 2734 | set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags); |
1da177e4 | 2735 | |
1da177e4 LT |
2736 | idetape_get_inquiry_results(drive); |
2737 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 2738 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 2739 | tape->user_bs_factor = 1; |
f73850a3 BP |
2740 | tape->buffer_size = *ctl * tape->blk_size; |
2741 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 2742 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 2743 | *ctl /= 2; |
f73850a3 | 2744 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 2745 | } |
f73850a3 | 2746 | buffer_size = tape->buffer_size; |
a997a435 | 2747 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
f73850a3 | 2748 | if (buffer_size % PAGE_SIZE) { |
a997a435 | 2749 | tape->pages_per_buffer++; |
f73850a3 | 2750 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
1da177e4 LT |
2751 | } |
2752 | ||
83042b24 | 2753 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 2754 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 2755 | |
f73850a3 | 2756 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
2757 | |
2758 | /* | |
3c98bf34 BP |
2759 | * Ensure that the number we got makes sense; limit it within |
2760 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 2761 | */ |
54bb2074 BP |
2762 | tape->best_dsc_rw_freq = max_t(unsigned long, |
2763 | min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), | |
2764 | IDETAPE_DSC_RW_MIN); | |
1da177e4 | 2765 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 2766 | "%lums tDSC%s\n", |
b6422013 | 2767 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
2768 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
2769 | tape->buffer_size / 1024, | |
54bb2074 | 2770 | tape->best_dsc_rw_freq * 1000 / HZ, |
1da177e4 LT |
2771 | drive->using_dma ? ", DMA":""); |
2772 | ||
2773 | idetape_add_settings(drive); | |
2774 | } | |
2775 | ||
4031bbe4 | 2776 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
2777 | { |
2778 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 2779 | |
7662d046 | 2780 | ide_proc_unregister_driver(drive, tape->driver); |
1da177e4 LT |
2781 | |
2782 | ide_unregister_region(tape->disk); | |
2783 | ||
2784 | ide_tape_put(tape); | |
1da177e4 LT |
2785 | } |
2786 | ||
2787 | static void ide_tape_release(struct kref *kref) | |
2788 | { | |
2789 | struct ide_tape_obj *tape = to_ide_tape(kref); | |
2790 | ide_drive_t *drive = tape->drive; | |
2791 | struct gendisk *g = tape->disk; | |
2792 | ||
83042b24 | 2793 | BUG_ON(tape->merge_stage_size); |
8604affd | 2794 | |
1da177e4 LT |
2795 | drive->dsc_overlap = 0; |
2796 | drive->driver_data = NULL; | |
dbc1272e | 2797 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
2798 | device_destroy(idetape_sysfs_class, |
2799 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
2800 | idetape_devs[tape->minor] = NULL; |
2801 | g->private_data = NULL; | |
2802 | put_disk(g); | |
2803 | kfree(tape); | |
2804 | } | |
2805 | ||
ecfd80e4 | 2806 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
2807 | static int proc_idetape_read_name |
2808 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2809 | { | |
2810 | ide_drive_t *drive = (ide_drive_t *) data; | |
2811 | idetape_tape_t *tape = drive->driver_data; | |
2812 | char *out = page; | |
2813 | int len; | |
2814 | ||
2815 | len = sprintf(out, "%s\n", tape->name); | |
2816 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2817 | } | |
2818 | ||
2819 | static ide_proc_entry_t idetape_proc[] = { | |
2820 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2821 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2822 | { NULL, 0, NULL, NULL } | |
2823 | }; | |
1da177e4 LT |
2824 | #endif |
2825 | ||
4031bbe4 | 2826 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 2827 | |
1da177e4 | 2828 | static ide_driver_t idetape_driver = { |
8604affd | 2829 | .gen_driver = { |
4ef3b8f4 | 2830 | .owner = THIS_MODULE, |
8604affd BZ |
2831 | .name = "ide-tape", |
2832 | .bus = &ide_bus_type, | |
8604affd | 2833 | }, |
4031bbe4 RK |
2834 | .probe = ide_tape_probe, |
2835 | .remove = ide_tape_remove, | |
1da177e4 LT |
2836 | .version = IDETAPE_VERSION, |
2837 | .media = ide_tape, | |
1da177e4 | 2838 | .supports_dsc_overlap = 1, |
1da177e4 LT |
2839 | .do_request = idetape_do_request, |
2840 | .end_request = idetape_end_request, | |
2841 | .error = __ide_error, | |
2842 | .abort = __ide_abort, | |
7662d046 | 2843 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 | 2844 | .proc = idetape_proc, |
7662d046 | 2845 | #endif |
1da177e4 LT |
2846 | }; |
2847 | ||
3c98bf34 | 2848 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 2849 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
2850 | .owner = THIS_MODULE, |
2851 | .read = idetape_chrdev_read, | |
2852 | .write = idetape_chrdev_write, | |
2853 | .ioctl = idetape_chrdev_ioctl, | |
2854 | .open = idetape_chrdev_open, | |
2855 | .release = idetape_chrdev_release, | |
2856 | }; | |
2857 | ||
2858 | static int idetape_open(struct inode *inode, struct file *filp) | |
2859 | { | |
2860 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2861 | struct ide_tape_obj *tape; | |
1da177e4 | 2862 | |
5a04cfa9 BP |
2863 | tape = ide_tape_get(disk); |
2864 | if (!tape) | |
1da177e4 LT |
2865 | return -ENXIO; |
2866 | ||
1da177e4 LT |
2867 | return 0; |
2868 | } | |
2869 | ||
2870 | static int idetape_release(struct inode *inode, struct file *filp) | |
2871 | { | |
2872 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2873 | struct ide_tape_obj *tape = ide_tape_g(disk); | |
1da177e4 LT |
2874 | |
2875 | ide_tape_put(tape); | |
2876 | ||
2877 | return 0; | |
2878 | } | |
2879 | ||
2880 | static int idetape_ioctl(struct inode *inode, struct file *file, | |
2881 | unsigned int cmd, unsigned long arg) | |
2882 | { | |
2883 | struct block_device *bdev = inode->i_bdev; | |
2884 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); | |
2885 | ide_drive_t *drive = tape->drive; | |
2886 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); | |
2887 | if (err == -EINVAL) | |
2888 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2889 | return err; | |
2890 | } | |
2891 | ||
2892 | static struct block_device_operations idetape_block_ops = { | |
2893 | .owner = THIS_MODULE, | |
2894 | .open = idetape_open, | |
2895 | .release = idetape_release, | |
2896 | .ioctl = idetape_ioctl, | |
2897 | }; | |
2898 | ||
4031bbe4 | 2899 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2900 | { |
2901 | idetape_tape_t *tape; | |
2902 | struct gendisk *g; | |
2903 | int minor; | |
2904 | ||
2905 | if (!strstr("ide-tape", drive->driver_req)) | |
2906 | goto failed; | |
2907 | if (!drive->present) | |
2908 | goto failed; | |
2909 | if (drive->media != ide_tape) | |
2910 | goto failed; | |
5a04cfa9 BP |
2911 | if (!idetape_identify_device(drive)) { |
2912 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" | |
2913 | " the driver\n", drive->name); | |
1da177e4 LT |
2914 | goto failed; |
2915 | } | |
2916 | if (drive->scsi) { | |
5a04cfa9 BP |
2917 | printk(KERN_INFO "ide-tape: passing drive %s to ide-scsi" |
2918 | " emulation.\n", drive->name); | |
1da177e4 LT |
2919 | goto failed; |
2920 | } | |
5a04cfa9 | 2921 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2922 | if (tape == NULL) { |
5a04cfa9 BP |
2923 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2924 | drive->name); | |
1da177e4 LT |
2925 | goto failed; |
2926 | } | |
2927 | ||
2928 | g = alloc_disk(1 << PARTN_BITS); | |
2929 | if (!g) | |
2930 | goto out_free_tape; | |
2931 | ||
2932 | ide_init_disk(g, drive); | |
2933 | ||
7662d046 | 2934 | ide_proc_register_driver(drive, &idetape_driver); |
1da177e4 | 2935 | |
1da177e4 LT |
2936 | kref_init(&tape->kref); |
2937 | ||
2938 | tape->drive = drive; | |
2939 | tape->driver = &idetape_driver; | |
2940 | tape->disk = g; | |
2941 | ||
2942 | g->private_data = &tape->driver; | |
2943 | ||
2944 | drive->driver_data = tape; | |
2945 | ||
cf8b8975 | 2946 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2947 | for (minor = 0; idetape_devs[minor]; minor++) |
2948 | ; | |
2949 | idetape_devs[minor] = tape; | |
cf8b8975 | 2950 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2951 | |
2952 | idetape_setup(drive, tape, minor); | |
2953 | ||
dbc1272e TJ |
2954 | device_create(idetape_sysfs_class, &drive->gendev, |
2955 | MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); | |
2956 | device_create(idetape_sysfs_class, &drive->gendev, | |
2957 | MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); | |
d5dee80a | 2958 | |
1da177e4 LT |
2959 | g->fops = &idetape_block_ops; |
2960 | ide_register_region(g); | |
2961 | ||
2962 | return 0; | |
8604affd | 2963 | |
1da177e4 LT |
2964 | out_free_tape: |
2965 | kfree(tape); | |
2966 | failed: | |
8604affd | 2967 | return -ENODEV; |
1da177e4 LT |
2968 | } |
2969 | ||
5a04cfa9 | 2970 | static void __exit idetape_exit(void) |
1da177e4 | 2971 | { |
8604affd | 2972 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2973 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2974 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2975 | } | |
2976 | ||
17514e8a | 2977 | static int __init idetape_init(void) |
1da177e4 | 2978 | { |
d5dee80a WD |
2979 | int error = 1; |
2980 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2981 | if (IS_ERR(idetape_sysfs_class)) { | |
2982 | idetape_sysfs_class = NULL; | |
2983 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2984 | error = -EBUSY; | |
2985 | goto out; | |
2986 | } | |
2987 | ||
1da177e4 | 2988 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2989 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2990 | " interface\n"); | |
d5dee80a WD |
2991 | error = -EBUSY; |
2992 | goto out_free_class; | |
1da177e4 | 2993 | } |
d5dee80a WD |
2994 | |
2995 | error = driver_register(&idetape_driver.gen_driver); | |
2996 | if (error) | |
2997 | goto out_free_driver; | |
2998 | ||
2999 | return 0; | |
3000 | ||
3001 | out_free_driver: | |
3002 | driver_unregister(&idetape_driver.gen_driver); | |
3003 | out_free_class: | |
3004 | class_destroy(idetape_sysfs_class); | |
3005 | out: | |
3006 | return error; | |
1da177e4 LT |
3007 | } |
3008 | ||
263756ec | 3009 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
3010 | module_init(idetape_init); |
3011 | module_exit(idetape_exit); | |
3012 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
3013 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
3014 | MODULE_LICENSE("GPL"); |