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Commit | Line | Data |
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1da177e4 | 1 | /* |
5ce78af4 BP |
2 | * IDE ATAPI streaming tape driver. |
3 | * | |
59bca8cc BZ |
4 | * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> |
5 | * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz | |
1da177e4 | 6 | * |
1da177e4 LT |
7 | * This driver was constructed as a student project in the software laboratory |
8 | * of the faculty of electrical engineering in the Technion - Israel's | |
9 | * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. | |
10 | * | |
11 | * It is hereby placed under the terms of the GNU general public license. | |
12 | * (See linux/COPYING). | |
1da177e4 | 13 | * |
5ce78af4 BP |
14 | * For a historical changelog see |
15 | * Documentation/ide/ChangeLog.ide-tape.1995-2002 | |
1da177e4 LT |
16 | */ |
17 | ||
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 | ||
1da177e4 | 218 | /* |
3c98bf34 BP |
219 | * Most of our global data which we need to save even as we leave the driver due |
220 | * to an interrupt or a timer event is stored in the struct defined below. | |
1da177e4 LT |
221 | */ |
222 | typedef struct ide_tape_obj { | |
223 | ide_drive_t *drive; | |
224 | ide_driver_t *driver; | |
225 | struct gendisk *disk; | |
226 | struct kref kref; | |
227 | ||
228 | /* | |
229 | * Since a typical character device operation requires more | |
230 | * than one packet command, we provide here enough memory | |
231 | * for the maximum of interconnected packet commands. | |
232 | * The packet commands are stored in the circular array pc_stack. | |
233 | * pc_stack_index points to the last used entry, and warps around | |
234 | * to the start when we get to the last array entry. | |
235 | * | |
236 | * pc points to the current processed packet command. | |
237 | * | |
238 | * failed_pc points to the last failed packet command, or contains | |
239 | * NULL if we do not need to retry any packet command. This is | |
240 | * required since an additional packet command is needed before the | |
241 | * retry, to get detailed information on what went wrong. | |
242 | */ | |
243 | /* Current packet command */ | |
d236d74c | 244 | struct ide_atapi_pc *pc; |
1da177e4 | 245 | /* Last failed packet command */ |
d236d74c | 246 | struct ide_atapi_pc *failed_pc; |
1da177e4 | 247 | /* Packet command stack */ |
d236d74c | 248 | struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK]; |
1da177e4 LT |
249 | /* Next free packet command storage space */ |
250 | int pc_stack_index; | |
251 | struct request rq_stack[IDETAPE_PC_STACK]; | |
252 | /* We implement a circular array */ | |
253 | int rq_stack_index; | |
254 | ||
255 | /* | |
3c98bf34 | 256 | * DSC polling variables. |
1da177e4 | 257 | * |
3c98bf34 BP |
258 | * While polling for DSC we use postponed_rq to postpone the current |
259 | * request so that ide.c will be able to service pending requests on the | |
260 | * other device. Note that at most we will have only one DSC (usually | |
5bd50dc6 | 261 | * data transfer) request in the device request queue. |
1da177e4 LT |
262 | */ |
263 | struct request *postponed_rq; | |
264 | /* The time in which we started polling for DSC */ | |
265 | unsigned long dsc_polling_start; | |
266 | /* Timer used to poll for dsc */ | |
267 | struct timer_list dsc_timer; | |
268 | /* Read/Write dsc polling frequency */ | |
54bb2074 BP |
269 | unsigned long best_dsc_rw_freq; |
270 | unsigned long dsc_poll_freq; | |
1da177e4 LT |
271 | unsigned long dsc_timeout; |
272 | ||
3c98bf34 | 273 | /* Read position information */ |
1da177e4 LT |
274 | u8 partition; |
275 | /* Current block */ | |
54bb2074 | 276 | unsigned int first_frame; |
1da177e4 | 277 | |
3c98bf34 | 278 | /* Last error information */ |
1da177e4 LT |
279 | u8 sense_key, asc, ascq; |
280 | ||
3c98bf34 | 281 | /* Character device operation */ |
1da177e4 LT |
282 | unsigned int minor; |
283 | /* device name */ | |
284 | char name[4]; | |
285 | /* Current character device data transfer direction */ | |
54abf37e | 286 | u8 chrdev_dir; |
1da177e4 | 287 | |
54bb2074 BP |
288 | /* tape block size, usually 512 or 1024 bytes */ |
289 | unsigned short blk_size; | |
1da177e4 | 290 | int user_bs_factor; |
b6422013 | 291 | |
1da177e4 | 292 | /* Copy of the tape's Capabilities and Mechanical Page */ |
b6422013 | 293 | u8 caps[20]; |
1da177e4 LT |
294 | |
295 | /* | |
3c98bf34 | 296 | * Active data transfer request parameters. |
1da177e4 | 297 | * |
3c98bf34 BP |
298 | * At most, there is only one ide-tape originated data transfer request |
299 | * in the device request queue. This allows ide.c to easily service | |
300 | * requests from the other device when we postpone our active request. | |
1da177e4 | 301 | */ |
83042b24 | 302 | |
3c98bf34 | 303 | /* Data buffer size chosen based on the tape's recommendation */ |
f73850a3 | 304 | int buffer_size; |
077e3bdb BP |
305 | /* merge buffer */ |
306 | struct idetape_bh *merge_bh; | |
01a63aeb BP |
307 | /* size of the merge buffer */ |
308 | int merge_bh_size; | |
077e3bdb | 309 | /* pointer to current buffer head within the merge buffer */ |
1da177e4 LT |
310 | struct idetape_bh *bh; |
311 | char *b_data; | |
312 | int b_count; | |
3c98bf34 | 313 | |
a997a435 | 314 | int pages_per_buffer; |
1da177e4 LT |
315 | /* Wasted space in each stage */ |
316 | int excess_bh_size; | |
317 | ||
318 | /* Status/Action flags: long for set_bit */ | |
319 | unsigned long flags; | |
320 | /* protects the ide-tape queue */ | |
54bb2074 | 321 | spinlock_t lock; |
1da177e4 | 322 | |
3c98bf34 | 323 | /* Measures average tape speed */ |
1da177e4 LT |
324 | unsigned long avg_time; |
325 | int avg_size; | |
326 | int avg_speed; | |
327 | ||
1da177e4 LT |
328 | /* the door is currently locked */ |
329 | int door_locked; | |
330 | /* the tape hardware is write protected */ | |
331 | char drv_write_prot; | |
332 | /* the tape is write protected (hardware or opened as read-only) */ | |
333 | char write_prot; | |
334 | ||
8004a8c9 | 335 | u32 debug_mask; |
1da177e4 LT |
336 | } idetape_tape_t; |
337 | ||
cf8b8975 | 338 | static DEFINE_MUTEX(idetape_ref_mutex); |
1da177e4 | 339 | |
d5dee80a WD |
340 | static struct class *idetape_sysfs_class; |
341 | ||
1da177e4 LT |
342 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
343 | ||
344 | #define ide_tape_g(disk) \ | |
345 | container_of((disk)->private_data, struct ide_tape_obj, driver) | |
346 | ||
347 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) | |
348 | { | |
349 | struct ide_tape_obj *tape = NULL; | |
350 | ||
cf8b8975 | 351 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
352 | tape = ide_tape_g(disk); |
353 | if (tape) | |
354 | kref_get(&tape->kref); | |
cf8b8975 | 355 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
356 | return tape; |
357 | } | |
358 | ||
359 | static void ide_tape_release(struct kref *); | |
360 | ||
361 | static void ide_tape_put(struct ide_tape_obj *tape) | |
362 | { | |
cf8b8975 | 363 | mutex_lock(&idetape_ref_mutex); |
1da177e4 | 364 | kref_put(&tape->kref, ide_tape_release); |
cf8b8975 | 365 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
366 | } |
367 | ||
1da177e4 | 368 | /* |
3c98bf34 BP |
369 | * The variables below are used for the character device interface. Additional |
370 | * state variables are defined in our ide_drive_t structure. | |
1da177e4 | 371 | */ |
5a04cfa9 | 372 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
1da177e4 LT |
373 | |
374 | #define ide_tape_f(file) ((file)->private_data) | |
375 | ||
376 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) | |
377 | { | |
378 | struct ide_tape_obj *tape = NULL; | |
379 | ||
cf8b8975 | 380 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
381 | tape = idetape_devs[i]; |
382 | if (tape) | |
383 | kref_get(&tape->kref); | |
cf8b8975 | 384 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
385 | return tape; |
386 | } | |
387 | ||
d236d74c | 388 | static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 389 | unsigned int bcount) |
1da177e4 LT |
390 | { |
391 | struct idetape_bh *bh = pc->bh; | |
392 | int count; | |
393 | ||
394 | while (bcount) { | |
1da177e4 LT |
395 | if (bh == NULL) { |
396 | printk(KERN_ERR "ide-tape: bh == NULL in " | |
397 | "idetape_input_buffers\n"); | |
9f87abe8 | 398 | ide_pad_transfer(drive, 0, bcount); |
1da177e4 LT |
399 | return; |
400 | } | |
5a04cfa9 BP |
401 | count = min( |
402 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
403 | bcount); | |
9567b349 | 404 | drive->hwif->input_data(drive, NULL, bh->b_data + |
5a04cfa9 | 405 | atomic_read(&bh->b_count), count); |
1da177e4 LT |
406 | bcount -= count; |
407 | atomic_add(count, &bh->b_count); | |
408 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
409 | bh = bh->b_reqnext; | |
410 | if (bh) | |
411 | atomic_set(&bh->b_count, 0); | |
412 | } | |
413 | } | |
414 | pc->bh = bh; | |
415 | } | |
416 | ||
d236d74c | 417 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 418 | unsigned int bcount) |
1da177e4 LT |
419 | { |
420 | struct idetape_bh *bh = pc->bh; | |
421 | int count; | |
422 | ||
423 | while (bcount) { | |
1da177e4 | 424 | if (bh == NULL) { |
5a04cfa9 BP |
425 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
426 | __func__); | |
1da177e4 LT |
427 | return; |
428 | } | |
1da177e4 | 429 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
9567b349 | 430 | drive->hwif->output_data(drive, NULL, pc->b_data, count); |
1da177e4 LT |
431 | bcount -= count; |
432 | pc->b_data += count; | |
433 | pc->b_count -= count; | |
434 | if (!pc->b_count) { | |
5a04cfa9 BP |
435 | bh = bh->b_reqnext; |
436 | pc->bh = bh; | |
1da177e4 LT |
437 | if (bh) { |
438 | pc->b_data = bh->b_data; | |
439 | pc->b_count = atomic_read(&bh->b_count); | |
440 | } | |
441 | } | |
442 | } | |
443 | } | |
444 | ||
d236d74c | 445 | static void idetape_update_buffers(struct ide_atapi_pc *pc) |
1da177e4 LT |
446 | { |
447 | struct idetape_bh *bh = pc->bh; | |
448 | int count; | |
d236d74c | 449 | unsigned int bcount = pc->xferred; |
1da177e4 | 450 | |
346331f8 | 451 | if (pc->flags & PC_FLAG_WRITING) |
1da177e4 LT |
452 | return; |
453 | while (bcount) { | |
1da177e4 | 454 | if (bh == NULL) { |
5a04cfa9 BP |
455 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
456 | __func__); | |
1da177e4 LT |
457 | return; |
458 | } | |
1da177e4 LT |
459 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
460 | atomic_set(&bh->b_count, count); | |
461 | if (atomic_read(&bh->b_count) == bh->b_size) | |
462 | bh = bh->b_reqnext; | |
463 | bcount -= count; | |
464 | } | |
465 | pc->bh = bh; | |
466 | } | |
467 | ||
468 | /* | |
469 | * idetape_next_pc_storage returns a pointer to a place in which we can | |
470 | * safely store a packet command, even though we intend to leave the | |
471 | * driver. A storage space for a maximum of IDETAPE_PC_STACK packet | |
472 | * commands is allocated at initialization time. | |
473 | */ | |
d236d74c | 474 | static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive) |
1da177e4 LT |
475 | { |
476 | idetape_tape_t *tape = drive->driver_data; | |
477 | ||
8004a8c9 BP |
478 | debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index); |
479 | ||
1da177e4 | 480 | if (tape->pc_stack_index == IDETAPE_PC_STACK) |
5a04cfa9 | 481 | tape->pc_stack_index = 0; |
1da177e4 LT |
482 | return (&tape->pc_stack[tape->pc_stack_index++]); |
483 | } | |
484 | ||
485 | /* | |
486 | * idetape_next_rq_storage is used along with idetape_next_pc_storage. | |
487 | * Since we queue packet commands in the request queue, we need to | |
488 | * allocate a request, along with the allocation of a packet command. | |
489 | */ | |
5a04cfa9 | 490 | |
1da177e4 LT |
491 | /************************************************************** |
492 | * * | |
493 | * This should get fixed to use kmalloc(.., GFP_ATOMIC) * | |
494 | * followed later on by kfree(). -ml * | |
495 | * * | |
496 | **************************************************************/ | |
5a04cfa9 BP |
497 | |
498 | static struct request *idetape_next_rq_storage(ide_drive_t *drive) | |
1da177e4 LT |
499 | { |
500 | idetape_tape_t *tape = drive->driver_data; | |
501 | ||
8004a8c9 BP |
502 | debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index); |
503 | ||
1da177e4 | 504 | if (tape->rq_stack_index == IDETAPE_PC_STACK) |
5a04cfa9 | 505 | tape->rq_stack_index = 0; |
1da177e4 LT |
506 | return (&tape->rq_stack[tape->rq_stack_index++]); |
507 | } | |
508 | ||
d236d74c | 509 | static void idetape_init_pc(struct ide_atapi_pc *pc) |
1da177e4 LT |
510 | { |
511 | memset(pc->c, 0, 12); | |
512 | pc->retries = 0; | |
513 | pc->flags = 0; | |
d236d74c BP |
514 | pc->req_xfer = 0; |
515 | pc->buf = pc->pc_buf; | |
516 | pc->buf_size = IDETAPE_PC_BUFFER_SIZE; | |
1da177e4 LT |
517 | pc->bh = NULL; |
518 | pc->b_data = NULL; | |
519 | } | |
520 | ||
521 | /* | |
1b5db434 BP |
522 | * called on each failed packet command retry to analyze the request sense. We |
523 | * currently do not utilize this information. | |
1da177e4 | 524 | */ |
1b5db434 | 525 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
1da177e4 LT |
526 | { |
527 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 528 | struct ide_atapi_pc *pc = tape->failed_pc; |
1da177e4 | 529 | |
1b5db434 BP |
530 | tape->sense_key = sense[2] & 0xF; |
531 | tape->asc = sense[12]; | |
532 | tape->ascq = sense[13]; | |
8004a8c9 BP |
533 | |
534 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
535 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
1da177e4 | 536 | |
d236d74c | 537 | /* Correct pc->xferred by asking the tape. */ |
346331f8 | 538 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
d236d74c | 539 | pc->xferred = pc->req_xfer - |
54bb2074 | 540 | tape->blk_size * |
860ff5ec | 541 | be32_to_cpu(get_unaligned((u32 *)&sense[3])); |
1da177e4 LT |
542 | idetape_update_buffers(pc); |
543 | } | |
544 | ||
545 | /* | |
546 | * If error was the result of a zero-length read or write command, | |
547 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
548 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
549 | */ | |
90699ce2 | 550 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
1b5db434 BP |
551 | /* length == 0 */ |
552 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
553 | if (tape->sense_key == 5) { | |
1da177e4 LT |
554 | /* don't report an error, everything's ok */ |
555 | pc->error = 0; | |
556 | /* don't retry read/write */ | |
346331f8 | 557 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
558 | } |
559 | } | |
90699ce2 | 560 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
1da177e4 | 561 | pc->error = IDETAPE_ERROR_FILEMARK; |
346331f8 | 562 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 563 | } |
90699ce2 | 564 | if (pc->c[0] == WRITE_6) { |
1b5db434 BP |
565 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
566 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
1da177e4 | 567 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 568 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 LT |
569 | } |
570 | } | |
90699ce2 | 571 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
1b5db434 | 572 | if (tape->sense_key == 8) { |
1da177e4 | 573 | pc->error = IDETAPE_ERROR_EOD; |
346331f8 | 574 | pc->flags |= PC_FLAG_ABORT; |
1da177e4 | 575 | } |
346331f8 | 576 | if (!(pc->flags & PC_FLAG_ABORT) && |
d236d74c | 577 | pc->xferred) |
1da177e4 LT |
578 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
579 | } | |
580 | } | |
581 | ||
d01dbc3b | 582 | /* Free data buffers completely. */ |
077e3bdb | 583 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) |
1da177e4 | 584 | { |
077e3bdb | 585 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; |
d01dbc3b BP |
586 | |
587 | while (bh) { | |
588 | u32 size = bh->b_size; | |
589 | ||
590 | while (size) { | |
591 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
592 | ||
593 | if (bh->b_data) | |
594 | free_pages((unsigned long)bh->b_data, order); | |
595 | ||
596 | size &= (order-1); | |
597 | bh->b_data += (1 << order) * PAGE_SIZE; | |
1da177e4 LT |
598 | } |
599 | prev_bh = bh; | |
600 | bh = bh->b_reqnext; | |
601 | kfree(prev_bh); | |
602 | } | |
077e3bdb | 603 | kfree(tape->merge_bh); |
1da177e4 LT |
604 | } |
605 | ||
1da177e4 LT |
606 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
607 | { | |
608 | struct request *rq = HWGROUP(drive)->rq; | |
609 | idetape_tape_t *tape = drive->driver_data; | |
610 | unsigned long flags; | |
611 | int error; | |
1da177e4 | 612 | |
8004a8c9 | 613 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
614 | |
615 | switch (uptodate) { | |
5a04cfa9 BP |
616 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
617 | case 1: error = 0; break; | |
618 | default: error = uptodate; | |
1da177e4 LT |
619 | } |
620 | rq->errors = error; | |
621 | if (error) | |
622 | tape->failed_pc = NULL; | |
623 | ||
3687221f BZ |
624 | if (!blk_special_request(rq)) { |
625 | ide_end_request(drive, uptodate, nr_sects); | |
626 | return 0; | |
627 | } | |
628 | ||
54bb2074 | 629 | spin_lock_irqsave(&tape->lock, flags); |
1da177e4 | 630 | |
1da177e4 | 631 | ide_end_drive_cmd(drive, 0, 0); |
1da177e4 | 632 | |
54bb2074 | 633 | spin_unlock_irqrestore(&tape->lock, flags); |
1da177e4 LT |
634 | return 0; |
635 | } | |
636 | ||
5a04cfa9 | 637 | static ide_startstop_t idetape_request_sense_callback(ide_drive_t *drive) |
1da177e4 LT |
638 | { |
639 | idetape_tape_t *tape = drive->driver_data; | |
640 | ||
8004a8c9 BP |
641 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
642 | ||
1da177e4 | 643 | if (!tape->pc->error) { |
d236d74c | 644 | idetape_analyze_error(drive, tape->pc->buf); |
1da177e4 LT |
645 | idetape_end_request(drive, 1, 0); |
646 | } else { | |
5a04cfa9 BP |
647 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - " |
648 | "Aborting request!\n"); | |
1da177e4 LT |
649 | idetape_end_request(drive, 0, 0); |
650 | } | |
651 | return ide_stopped; | |
652 | } | |
653 | ||
d236d74c | 654 | static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) |
1da177e4 | 655 | { |
5a04cfa9 | 656 | idetape_init_pc(pc); |
90699ce2 | 657 | pc->c[0] = REQUEST_SENSE; |
1da177e4 | 658 | pc->c[4] = 20; |
d236d74c BP |
659 | pc->req_xfer = 20; |
660 | pc->idetape_callback = &idetape_request_sense_callback; | |
1da177e4 LT |
661 | } |
662 | ||
663 | static void idetape_init_rq(struct request *rq, u8 cmd) | |
664 | { | |
e7b241a7 | 665 | blk_rq_init(NULL, rq); |
4aff5e23 | 666 | rq->cmd_type = REQ_TYPE_SPECIAL; |
1da177e4 LT |
667 | rq->cmd[0] = cmd; |
668 | } | |
669 | ||
670 | /* | |
3c98bf34 BP |
671 | * Generate a new packet command request in front of the request queue, before |
672 | * the current request, so that it will be processed immediately, on the next | |
673 | * pass through the driver. The function below is called from the request | |
674 | * handling part of the driver (the "bottom" part). Safe storage for the request | |
675 | * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that. | |
1da177e4 | 676 | * |
3c98bf34 BP |
677 | * Memory for those requests is pre-allocated at initialization time, and is |
678 | * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for | |
679 | * the maximum possible number of inter-dependent packet commands. | |
1da177e4 | 680 | * |
3c98bf34 BP |
681 | * The higher level of the driver - The ioctl handler and the character device |
682 | * handling functions should queue request to the lower level part and wait for | |
683 | * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail. | |
1da177e4 | 684 | */ |
d236d74c | 685 | static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc, |
5a04cfa9 | 686 | struct request *rq) |
1da177e4 LT |
687 | { |
688 | struct ide_tape_obj *tape = drive->driver_data; | |
689 | ||
690 | idetape_init_rq(rq, REQ_IDETAPE_PC1); | |
691 | rq->buffer = (char *) pc; | |
692 | rq->rq_disk = tape->disk; | |
693 | (void) ide_do_drive_cmd(drive, rq, ide_preempt); | |
694 | } | |
695 | ||
696 | /* | |
697 | * idetape_retry_pc is called when an error was detected during the | |
698 | * last packet command. We queue a request sense packet command in | |
699 | * the head of the request list. | |
700 | */ | |
701 | static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) | |
702 | { | |
703 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 704 | struct ide_atapi_pc *pc; |
1da177e4 | 705 | struct request *rq; |
1da177e4 | 706 | |
64a57fe4 | 707 | (void)ide_read_error(drive); |
1da177e4 LT |
708 | pc = idetape_next_pc_storage(drive); |
709 | rq = idetape_next_rq_storage(drive); | |
710 | idetape_create_request_sense_cmd(pc); | |
346331f8 | 711 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
1da177e4 LT |
712 | idetape_queue_pc_head(drive, pc, rq); |
713 | return ide_stopped; | |
714 | } | |
715 | ||
716 | /* | |
3c98bf34 BP |
717 | * Postpone the current request so that ide.c will be able to service requests |
718 | * from another device on the same hwgroup while we are polling for DSC. | |
1da177e4 | 719 | */ |
5a04cfa9 | 720 | static void idetape_postpone_request(ide_drive_t *drive) |
1da177e4 LT |
721 | { |
722 | idetape_tape_t *tape = drive->driver_data; | |
723 | ||
8004a8c9 BP |
724 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
725 | ||
1da177e4 | 726 | tape->postponed_rq = HWGROUP(drive)->rq; |
54bb2074 | 727 | ide_stall_queue(drive, tape->dsc_poll_freq); |
1da177e4 LT |
728 | } |
729 | ||
d236d74c | 730 | typedef void idetape_io_buf(ide_drive_t *, struct ide_atapi_pc *, unsigned int); |
a1efc85f | 731 | |
1da177e4 | 732 | /* |
a1efc85f BP |
733 | * This is the usual interrupt handler which will be called during a packet |
734 | * command. We will transfer some of the data (as requested by the drive) and | |
735 | * will re-point interrupt handler to us. When data transfer is finished, we | |
736 | * will act according to the algorithm described before | |
8d06bfad | 737 | * idetape_issue_pc. |
1da177e4 | 738 | */ |
a1efc85f | 739 | static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) |
1da177e4 LT |
740 | { |
741 | ide_hwif_t *hwif = drive->hwif; | |
742 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 743 | struct ide_atapi_pc *pc = tape->pc; |
a1efc85f BP |
744 | xfer_func_t *xferfunc; |
745 | idetape_io_buf *iobuf; | |
1da177e4 LT |
746 | unsigned int temp; |
747 | #if SIMULATE_ERRORS | |
5a04cfa9 | 748 | static int error_sim_count; |
1da177e4 | 749 | #endif |
790d1239 | 750 | u16 bcount; |
8e7657ae | 751 | u8 stat, ireason; |
1da177e4 | 752 | |
8004a8c9 | 753 | debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__); |
1da177e4 LT |
754 | |
755 | /* Clear the interrupt */ | |
c47137a9 | 756 | stat = ide_read_status(drive); |
1da177e4 | 757 | |
346331f8 | 758 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
5e37bdc0 | 759 | if (hwif->dma_ops->dma_end(drive) || (stat & ERR_STAT)) { |
1da177e4 LT |
760 | /* |
761 | * A DMA error is sometimes expected. For example, | |
762 | * if the tape is crossing a filemark during a | |
763 | * READ command, it will issue an irq and position | |
764 | * itself before the filemark, so that only a partial | |
765 | * data transfer will occur (which causes the DMA | |
766 | * error). In that case, we will later ask the tape | |
767 | * how much bytes of the original request were | |
768 | * actually transferred (we can't receive that | |
769 | * information from the DMA engine on most chipsets). | |
770 | */ | |
771 | ||
772 | /* | |
773 | * On the contrary, a DMA error is never expected; | |
774 | * it usually indicates a hardware error or abort. | |
775 | * If the tape crosses a filemark during a READ | |
776 | * command, it will issue an irq and position itself | |
777 | * after the filemark (not before). Only a partial | |
778 | * data transfer will occur, but no DMA error. | |
779 | * (AS, 19 Apr 2001) | |
780 | */ | |
346331f8 | 781 | pc->flags |= PC_FLAG_DMA_ERROR; |
1da177e4 | 782 | } else { |
d236d74c | 783 | pc->xferred = pc->req_xfer; |
1da177e4 LT |
784 | idetape_update_buffers(pc); |
785 | } | |
8004a8c9 BP |
786 | debug_log(DBG_PROCS, "DMA finished\n"); |
787 | ||
1da177e4 LT |
788 | } |
789 | ||
790 | /* No more interrupts */ | |
22c525b9 | 791 | if ((stat & DRQ_STAT) == 0) { |
8004a8c9 | 792 | debug_log(DBG_SENSE, "Packet command completed, %d bytes" |
d236d74c | 793 | " transferred\n", pc->xferred); |
1da177e4 | 794 | |
346331f8 | 795 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
1da177e4 LT |
796 | local_irq_enable(); |
797 | ||
798 | #if SIMULATE_ERRORS | |
90699ce2 | 799 | if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) && |
1da177e4 LT |
800 | (++error_sim_count % 100) == 0) { |
801 | printk(KERN_INFO "ide-tape: %s: simulating error\n", | |
802 | tape->name); | |
22c525b9 | 803 | stat |= ERR_STAT; |
1da177e4 LT |
804 | } |
805 | #endif | |
90699ce2 | 806 | if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE) |
22c525b9 | 807 | stat &= ~ERR_STAT; |
346331f8 | 808 | if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) { |
22c525b9 | 809 | /* Error detected */ |
8004a8c9 BP |
810 | debug_log(DBG_ERR, "%s: I/O error\n", tape->name); |
811 | ||
90699ce2 | 812 | if (pc->c[0] == REQUEST_SENSE) { |
a1efc85f BP |
813 | printk(KERN_ERR "ide-tape: I/O error in request" |
814 | " sense command\n"); | |
1da177e4 LT |
815 | return ide_do_reset(drive); |
816 | } | |
8004a8c9 BP |
817 | debug_log(DBG_ERR, "[cmd %x]: check condition\n", |
818 | pc->c[0]); | |
819 | ||
1da177e4 LT |
820 | /* Retry operation */ |
821 | return idetape_retry_pc(drive); | |
822 | } | |
823 | pc->error = 0; | |
346331f8 | 824 | if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && |
22c525b9 | 825 | (stat & SEEK_STAT) == 0) { |
1da177e4 LT |
826 | /* Media access command */ |
827 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 828 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; |
1da177e4 LT |
829 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; |
830 | /* Allow ide.c to handle other requests */ | |
831 | idetape_postpone_request(drive); | |
832 | return ide_stopped; | |
833 | } | |
834 | if (tape->failed_pc == pc) | |
835 | tape->failed_pc = NULL; | |
836 | /* Command finished - Call the callback function */ | |
d236d74c | 837 | return pc->idetape_callback(drive); |
1da177e4 | 838 | } |
346331f8 BP |
839 | |
840 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { | |
841 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; | |
1da177e4 LT |
842 | printk(KERN_ERR "ide-tape: The tape wants to issue more " |
843 | "interrupts in DMA mode\n"); | |
844 | printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); | |
7469aaf6 | 845 | ide_dma_off(drive); |
1da177e4 LT |
846 | return ide_do_reset(drive); |
847 | } | |
848 | /* Get the number of bytes to transfer on this interrupt. */ | |
4c3032d8 BZ |
849 | bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) | |
850 | hwif->INB(hwif->io_ports.lbam_addr); | |
1da177e4 | 851 | |
4c3032d8 | 852 | ireason = hwif->INB(hwif->io_ports.nsect_addr); |
1da177e4 | 853 | |
8e7657ae | 854 | if (ireason & CD) { |
a1efc85f | 855 | printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__); |
1da177e4 LT |
856 | return ide_do_reset(drive); |
857 | } | |
346331f8 | 858 | if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) { |
1da177e4 LT |
859 | /* Hopefully, we will never get here */ |
860 | printk(KERN_ERR "ide-tape: We wanted to %s, ", | |
8e7657ae | 861 | (ireason & IO) ? "Write" : "Read"); |
1da177e4 | 862 | printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n", |
8e7657ae | 863 | (ireason & IO) ? "Read" : "Write"); |
1da177e4 LT |
864 | return ide_do_reset(drive); |
865 | } | |
346331f8 | 866 | if (!(pc->flags & PC_FLAG_WRITING)) { |
1da177e4 | 867 | /* Reading - Check that we have enough space */ |
d236d74c BP |
868 | temp = pc->xferred + bcount; |
869 | if (temp > pc->req_xfer) { | |
870 | if (temp > pc->buf_size) { | |
a1efc85f BP |
871 | printk(KERN_ERR "ide-tape: The tape wants to " |
872 | "send us more data than expected " | |
873 | "- discarding data\n"); | |
9f87abe8 | 874 | ide_pad_transfer(drive, 0, bcount); |
a1efc85f BP |
875 | ide_set_handler(drive, &idetape_pc_intr, |
876 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
877 | return ide_started; |
878 | } | |
8004a8c9 BP |
879 | debug_log(DBG_SENSE, "The tape wants to send us more " |
880 | "data than expected - allowing transfer\n"); | |
1da177e4 | 881 | } |
a1efc85f | 882 | iobuf = &idetape_input_buffers; |
9567b349 | 883 | xferfunc = hwif->input_data; |
1da177e4 | 884 | } else { |
a1efc85f | 885 | iobuf = &idetape_output_buffers; |
9567b349 | 886 | xferfunc = hwif->output_data; |
1da177e4 | 887 | } |
a1efc85f BP |
888 | |
889 | if (pc->bh) | |
890 | iobuf(drive, pc, bcount); | |
891 | else | |
9567b349 | 892 | xferfunc(drive, NULL, pc->cur_pos, bcount); |
a1efc85f | 893 | |
1da177e4 | 894 | /* Update the current position */ |
d236d74c BP |
895 | pc->xferred += bcount; |
896 | pc->cur_pos += bcount; | |
8004a8c9 BP |
897 | |
898 | debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n", | |
899 | pc->c[0], bcount); | |
900 | ||
1da177e4 LT |
901 | /* And set the interrupt handler again */ |
902 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); | |
903 | return ide_started; | |
904 | } | |
905 | ||
906 | /* | |
3c98bf34 | 907 | * Packet Command Interface |
1da177e4 | 908 | * |
3c98bf34 BP |
909 | * The current Packet Command is available in tape->pc, and will not change |
910 | * until we finish handling it. Each packet command is associated with a | |
911 | * callback function that will be called when the command is finished. | |
1da177e4 | 912 | * |
3c98bf34 | 913 | * The handling will be done in three stages: |
1da177e4 | 914 | * |
3c98bf34 BP |
915 | * 1. idetape_issue_pc will send the packet command to the drive, and will set |
916 | * the interrupt handler to idetape_pc_intr. | |
1da177e4 | 917 | * |
3c98bf34 BP |
918 | * 2. On each interrupt, idetape_pc_intr will be called. This step will be |
919 | * repeated until the device signals us that no more interrupts will be issued. | |
1da177e4 | 920 | * |
3c98bf34 BP |
921 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
922 | * process. In case of a successful initiation of a media access packet command, | |
923 | * the DSC bit will be set when the actual execution of the command is finished. | |
924 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
925 | * event. In this case, we define the request as "low priority request" by | |
926 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
927 | * exit the driver. | |
1da177e4 | 928 | * |
3c98bf34 BP |
929 | * ide.c will then give higher priority to requests which originate from the |
930 | * other device, until will change rq_status to RQ_ACTIVE. | |
1da177e4 | 931 | * |
3c98bf34 | 932 | * 4. When the packet command is finished, it will be checked for errors. |
1da177e4 | 933 | * |
3c98bf34 BP |
934 | * 5. In case an error was found, we queue a request sense packet command in |
935 | * front of the request queue and retry the operation up to | |
936 | * IDETAPE_MAX_PC_RETRIES times. | |
1da177e4 | 937 | * |
3c98bf34 BP |
938 | * 6. In case no error was found, or we decided to give up and not to retry |
939 | * again, the callback function will be called and then we will handle the next | |
940 | * request. | |
1da177e4 LT |
941 | */ |
942 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) | |
943 | { | |
944 | ide_hwif_t *hwif = drive->hwif; | |
945 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 946 | struct ide_atapi_pc *pc = tape->pc; |
1da177e4 LT |
947 | int retries = 100; |
948 | ide_startstop_t startstop; | |
8e7657ae | 949 | u8 ireason; |
1da177e4 | 950 | |
5a04cfa9 BP |
951 | if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) { |
952 | printk(KERN_ERR "ide-tape: Strange, packet command initiated " | |
953 | "yet DRQ isn't asserted\n"); | |
1da177e4 LT |
954 | return startstop; |
955 | } | |
4c3032d8 | 956 | ireason = hwif->INB(hwif->io_ports.nsect_addr); |
8e7657ae | 957 | while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { |
1da177e4 LT |
958 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " |
959 | "a packet command, retrying\n"); | |
960 | udelay(100); | |
4c3032d8 | 961 | ireason = hwif->INB(hwif->io_ports.nsect_addr); |
1da177e4 LT |
962 | if (retries == 0) { |
963 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " | |
964 | "issuing a packet command, ignoring\n"); | |
8e7657ae BZ |
965 | ireason |= CD; |
966 | ireason &= ~IO; | |
1da177e4 LT |
967 | } |
968 | } | |
8e7657ae | 969 | if ((ireason & CD) == 0 || (ireason & IO)) { |
1da177e4 LT |
970 | printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " |
971 | "a packet command\n"); | |
972 | return ide_do_reset(drive); | |
973 | } | |
974 | /* Set the interrupt routine */ | |
975 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); | |
976 | #ifdef CONFIG_BLK_DEV_IDEDMA | |
977 | /* Begin DMA, if necessary */ | |
346331f8 | 978 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) |
5e37bdc0 | 979 | hwif->dma_ops->dma_start(drive); |
1da177e4 LT |
980 | #endif |
981 | /* Send the actual packet */ | |
9567b349 BZ |
982 | hwif->output_data(drive, NULL, pc->c, 12); |
983 | ||
1da177e4 LT |
984 | return ide_started; |
985 | } | |
986 | ||
d236d74c BP |
987 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
988 | struct ide_atapi_pc *pc) | |
1da177e4 LT |
989 | { |
990 | ide_hwif_t *hwif = drive->hwif; | |
991 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 992 | int dma_ok = 0; |
790d1239 | 993 | u16 bcount; |
1da177e4 | 994 | |
90699ce2 BP |
995 | if (tape->pc->c[0] == REQUEST_SENSE && |
996 | pc->c[0] == REQUEST_SENSE) { | |
1da177e4 LT |
997 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
998 | "Two request sense in serial were issued\n"); | |
999 | } | |
1da177e4 | 1000 | |
90699ce2 | 1001 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
1da177e4 LT |
1002 | tape->failed_pc = pc; |
1003 | /* Set the current packet command */ | |
1004 | tape->pc = pc; | |
1005 | ||
1006 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
346331f8 | 1007 | (pc->flags & PC_FLAG_ABORT)) { |
1da177e4 | 1008 | /* |
3c98bf34 BP |
1009 | * We will "abort" retrying a packet command in case legitimate |
1010 | * error code was received (crossing a filemark, or end of the | |
1011 | * media, for example). | |
1da177e4 | 1012 | */ |
346331f8 | 1013 | if (!(pc->flags & PC_FLAG_ABORT)) { |
90699ce2 | 1014 | if (!(pc->c[0] == TEST_UNIT_READY && |
1da177e4 LT |
1015 | tape->sense_key == 2 && tape->asc == 4 && |
1016 | (tape->ascq == 1 || tape->ascq == 8))) { | |
1017 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
1018 | "pc = %2x, key = %2x, " | |
1019 | "asc = %2x, ascq = %2x\n", | |
1020 | tape->name, pc->c[0], | |
1021 | tape->sense_key, tape->asc, | |
1022 | tape->ascq); | |
1023 | } | |
1024 | /* Giving up */ | |
1025 | pc->error = IDETAPE_ERROR_GENERAL; | |
1026 | } | |
1027 | tape->failed_pc = NULL; | |
d236d74c | 1028 | return pc->idetape_callback(drive); |
1da177e4 | 1029 | } |
8004a8c9 | 1030 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
1da177e4 LT |
1031 | |
1032 | pc->retries++; | |
1033 | /* We haven't transferred any data yet */ | |
d236d74c BP |
1034 | pc->xferred = 0; |
1035 | pc->cur_pos = pc->buf; | |
1da177e4 | 1036 | /* Request to transfer the entire buffer at once */ |
d236d74c | 1037 | bcount = pc->req_xfer; |
1da177e4 | 1038 | |
346331f8 BP |
1039 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
1040 | pc->flags &= ~PC_FLAG_DMA_ERROR; | |
1da177e4 LT |
1041 | printk(KERN_WARNING "ide-tape: DMA disabled, " |
1042 | "reverting to PIO\n"); | |
7469aaf6 | 1043 | ide_dma_off(drive); |
1da177e4 | 1044 | } |
346331f8 | 1045 | if ((pc->flags & PC_FLAG_DMA_RECOMMENDED) && drive->using_dma) |
5e37bdc0 | 1046 | dma_ok = !hwif->dma_ops->dma_setup(drive); |
1da177e4 | 1047 | |
2fc57388 BZ |
1048 | ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK | |
1049 | IDE_TFLAG_OUT_DEVICE, bcount, dma_ok); | |
1050 | ||
346331f8 BP |
1051 | if (dma_ok) |
1052 | /* Will begin DMA later */ | |
1053 | pc->flags |= PC_FLAG_DMA_IN_PROGRESS; | |
1054 | if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags)) { | |
c1c9dbc8 BZ |
1055 | ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc, |
1056 | IDETAPE_WAIT_CMD, NULL); | |
1da177e4 LT |
1057 | return ide_started; |
1058 | } else { | |
1fc14258 | 1059 | ide_execute_pkt_cmd(drive); |
1da177e4 LT |
1060 | return idetape_transfer_pc(drive); |
1061 | } | |
1062 | } | |
1063 | ||
5a04cfa9 | 1064 | static ide_startstop_t idetape_pc_callback(ide_drive_t *drive) |
1da177e4 LT |
1065 | { |
1066 | idetape_tape_t *tape = drive->driver_data; | |
8004a8c9 BP |
1067 | |
1068 | debug_log(DBG_PROCS, "Enter %s\n", __func__); | |
1da177e4 LT |
1069 | |
1070 | idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); | |
1071 | return ide_stopped; | |
1072 | } | |
1073 | ||
3c98bf34 | 1074 | /* A mode sense command is used to "sense" tape parameters. */ |
d236d74c | 1075 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
1da177e4 LT |
1076 | { |
1077 | idetape_init_pc(pc); | |
90699ce2 | 1078 | pc->c[0] = MODE_SENSE; |
1da177e4 | 1079 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
3c98bf34 BP |
1080 | /* DBD = 1 - Don't return block descriptors */ |
1081 | pc->c[1] = 8; | |
1da177e4 LT |
1082 | pc->c[2] = page_code; |
1083 | /* | |
1084 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
1085 | * | |
1086 | * For SCSI this byte is defined as subpage instead of high byte | |
1087 | * of length and some IDE drives seem to interpret it this way | |
1088 | * and return an error when 255 is used. | |
1089 | */ | |
1090 | pc->c[3] = 0; | |
3c98bf34 BP |
1091 | /* We will just discard data in that case */ |
1092 | pc->c[4] = 255; | |
1da177e4 | 1093 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
d236d74c | 1094 | pc->req_xfer = 12; |
1da177e4 | 1095 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
d236d74c | 1096 | pc->req_xfer = 24; |
1da177e4 | 1097 | else |
d236d74c BP |
1098 | pc->req_xfer = 50; |
1099 | pc->idetape_callback = &idetape_pc_callback; | |
1da177e4 LT |
1100 | } |
1101 | ||
5a04cfa9 | 1102 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
1da177e4 LT |
1103 | { |
1104 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1105 | struct ide_atapi_pc *pc = tape->pc; |
22c525b9 | 1106 | u8 stat; |
1da177e4 | 1107 | |
c47137a9 BZ |
1108 | stat = ide_read_status(drive); |
1109 | ||
22c525b9 BZ |
1110 | if (stat & SEEK_STAT) { |
1111 | if (stat & ERR_STAT) { | |
1da177e4 | 1112 | /* Error detected */ |
90699ce2 | 1113 | if (pc->c[0] != TEST_UNIT_READY) |
1da177e4 LT |
1114 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
1115 | tape->name); | |
1116 | /* Retry operation */ | |
1117 | return idetape_retry_pc(drive); | |
1118 | } | |
1119 | pc->error = 0; | |
1120 | if (tape->failed_pc == pc) | |
1121 | tape->failed_pc = NULL; | |
1122 | } else { | |
1123 | pc->error = IDETAPE_ERROR_GENERAL; | |
1124 | tape->failed_pc = NULL; | |
1125 | } | |
d236d74c | 1126 | return pc->idetape_callback(drive); |
1da177e4 LT |
1127 | } |
1128 | ||
5a04cfa9 | 1129 | static ide_startstop_t idetape_rw_callback(ide_drive_t *drive) |
1da177e4 LT |
1130 | { |
1131 | idetape_tape_t *tape = drive->driver_data; | |
1132 | struct request *rq = HWGROUP(drive)->rq; | |
d236d74c | 1133 | int blocks = tape->pc->xferred / tape->blk_size; |
1da177e4 | 1134 | |
54bb2074 | 1135 | tape->avg_size += blocks * tape->blk_size; |
83042b24 | 1136 | |
9bae1ff3 | 1137 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { |
5a04cfa9 BP |
1138 | tape->avg_speed = tape->avg_size * HZ / |
1139 | (jiffies - tape->avg_time) / 1024; | |
1da177e4 LT |
1140 | tape->avg_size = 0; |
1141 | tape->avg_time = jiffies; | |
1142 | } | |
8004a8c9 | 1143 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 | 1144 | |
54bb2074 | 1145 | tape->first_frame += blocks; |
1da177e4 LT |
1146 | rq->current_nr_sectors -= blocks; |
1147 | ||
1148 | if (!tape->pc->error) | |
1149 | idetape_end_request(drive, 1, 0); | |
1150 | else | |
1151 | idetape_end_request(drive, tape->pc->error, 0); | |
1152 | return ide_stopped; | |
1153 | } | |
1154 | ||
d236d74c BP |
1155 | static void idetape_create_read_cmd(idetape_tape_t *tape, |
1156 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1157 | unsigned int length, struct idetape_bh *bh) |
1da177e4 LT |
1158 | { |
1159 | idetape_init_pc(pc); | |
90699ce2 | 1160 | pc->c[0] = READ_6; |
860ff5ec | 1161 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 1162 | pc->c[1] = 1; |
d236d74c | 1163 | pc->idetape_callback = &idetape_rw_callback; |
1da177e4 LT |
1164 | pc->bh = bh; |
1165 | atomic_set(&bh->b_count, 0); | |
d236d74c BP |
1166 | pc->buf = NULL; |
1167 | pc->buf_size = length * tape->blk_size; | |
1168 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 1169 | if (pc->req_xfer == tape->buffer_size) |
346331f8 | 1170 | pc->flags |= PC_FLAG_DMA_RECOMMENDED; |
1da177e4 LT |
1171 | } |
1172 | ||
d236d74c BP |
1173 | static void idetape_create_write_cmd(idetape_tape_t *tape, |
1174 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1175 | unsigned int length, struct idetape_bh *bh) |
1da177e4 LT |
1176 | { |
1177 | idetape_init_pc(pc); | |
90699ce2 | 1178 | pc->c[0] = WRITE_6; |
860ff5ec | 1179 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
1da177e4 | 1180 | pc->c[1] = 1; |
d236d74c | 1181 | pc->idetape_callback = &idetape_rw_callback; |
346331f8 | 1182 | pc->flags |= PC_FLAG_WRITING; |
1da177e4 LT |
1183 | pc->bh = bh; |
1184 | pc->b_data = bh->b_data; | |
1185 | pc->b_count = atomic_read(&bh->b_count); | |
d236d74c BP |
1186 | pc->buf = NULL; |
1187 | pc->buf_size = length * tape->blk_size; | |
1188 | pc->req_xfer = pc->buf_size; | |
f73850a3 | 1189 | if (pc->req_xfer == tape->buffer_size) |
346331f8 | 1190 | pc->flags |= PC_FLAG_DMA_RECOMMENDED; |
1da177e4 LT |
1191 | } |
1192 | ||
1da177e4 LT |
1193 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
1194 | struct request *rq, sector_t block) | |
1195 | { | |
1196 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1197 | struct ide_atapi_pc *pc = NULL; |
1da177e4 | 1198 | struct request *postponed_rq = tape->postponed_rq; |
22c525b9 | 1199 | u8 stat; |
1da177e4 | 1200 | |
8004a8c9 BP |
1201 | debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld," |
1202 | " current_nr_sectors: %d\n", | |
1da177e4 | 1203 | rq->sector, rq->nr_sectors, rq->current_nr_sectors); |
1da177e4 | 1204 | |
4aff5e23 | 1205 | if (!blk_special_request(rq)) { |
3c98bf34 | 1206 | /* We do not support buffer cache originated requests. */ |
1da177e4 | 1207 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
4aff5e23 | 1208 | "request queue (%d)\n", drive->name, rq->cmd_type); |
1da177e4 LT |
1209 | ide_end_request(drive, 0, 0); |
1210 | return ide_stopped; | |
1211 | } | |
1212 | ||
3c98bf34 | 1213 | /* Retry a failed packet command */ |
5a04cfa9 | 1214 | if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) |
8d06bfad | 1215 | return idetape_issue_pc(drive, tape->failed_pc); |
5a04cfa9 | 1216 | |
1da177e4 LT |
1217 | if (postponed_rq != NULL) |
1218 | if (rq != postponed_rq) { | |
1219 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
1220 | "Two DSC requests were queued\n"); | |
1221 | idetape_end_request(drive, 0, 0); | |
1222 | return ide_stopped; | |
1223 | } | |
1da177e4 LT |
1224 | |
1225 | tape->postponed_rq = NULL; | |
1226 | ||
1227 | /* | |
1228 | * If the tape is still busy, postpone our request and service | |
1229 | * the other device meanwhile. | |
1230 | */ | |
c47137a9 | 1231 | stat = ide_read_status(drive); |
1da177e4 LT |
1232 | |
1233 | if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) | |
346331f8 | 1234 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
1da177e4 LT |
1235 | |
1236 | if (drive->post_reset == 1) { | |
346331f8 | 1237 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
1da177e4 LT |
1238 | drive->post_reset = 0; |
1239 | } | |
1240 | ||
346331f8 | 1241 | if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) && |
22c525b9 | 1242 | (stat & SEEK_STAT) == 0) { |
1da177e4 LT |
1243 | if (postponed_rq == NULL) { |
1244 | tape->dsc_polling_start = jiffies; | |
54bb2074 | 1245 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
1da177e4 LT |
1246 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
1247 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
1248 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
1249 | tape->name); | |
1250 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { | |
1251 | idetape_media_access_finished(drive); | |
1252 | return ide_stopped; | |
1253 | } else { | |
1254 | return ide_do_reset(drive); | |
1255 | } | |
5a04cfa9 BP |
1256 | } else if (time_after(jiffies, |
1257 | tape->dsc_polling_start + | |
1258 | IDETAPE_DSC_MA_THRESHOLD)) | |
54bb2074 | 1259 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
1da177e4 LT |
1260 | idetape_postpone_request(drive); |
1261 | return ide_stopped; | |
1262 | } | |
1263 | if (rq->cmd[0] & REQ_IDETAPE_READ) { | |
1da177e4 | 1264 | pc = idetape_next_pc_storage(drive); |
5a04cfa9 BP |
1265 | idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, |
1266 | (struct idetape_bh *)rq->special); | |
1da177e4 LT |
1267 | goto out; |
1268 | } | |
1269 | if (rq->cmd[0] & REQ_IDETAPE_WRITE) { | |
1da177e4 | 1270 | pc = idetape_next_pc_storage(drive); |
5a04cfa9 BP |
1271 | idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, |
1272 | (struct idetape_bh *)rq->special); | |
1da177e4 LT |
1273 | goto out; |
1274 | } | |
1da177e4 | 1275 | if (rq->cmd[0] & REQ_IDETAPE_PC1) { |
d236d74c | 1276 | pc = (struct ide_atapi_pc *) rq->buffer; |
1da177e4 LT |
1277 | rq->cmd[0] &= ~(REQ_IDETAPE_PC1); |
1278 | rq->cmd[0] |= REQ_IDETAPE_PC2; | |
1279 | goto out; | |
1280 | } | |
1281 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { | |
1282 | idetape_media_access_finished(drive); | |
1283 | return ide_stopped; | |
1284 | } | |
1285 | BUG(); | |
1286 | out: | |
8d06bfad | 1287 | return idetape_issue_pc(drive, pc); |
1da177e4 LT |
1288 | } |
1289 | ||
1da177e4 | 1290 | /* |
41aa1706 | 1291 | * The function below uses __get_free_pages to allocate a data buffer of size |
f73850a3 | 1292 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
3c98bf34 | 1293 | * much as possible. |
1da177e4 | 1294 | * |
41aa1706 BP |
1295 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
1296 | * failure. | |
1da177e4 | 1297 | */ |
077e3bdb BP |
1298 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, |
1299 | int full, int clear) | |
1da177e4 | 1300 | { |
077e3bdb | 1301 | struct idetape_bh *prev_bh, *bh, *merge_bh; |
a997a435 | 1302 | int pages = tape->pages_per_buffer; |
41aa1706 | 1303 | unsigned int order, b_allocd; |
1da177e4 LT |
1304 | char *b_data = NULL; |
1305 | ||
077e3bdb BP |
1306 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1307 | bh = merge_bh; | |
1da177e4 LT |
1308 | if (bh == NULL) |
1309 | goto abort; | |
41aa1706 BP |
1310 | |
1311 | order = fls(pages) - 1; | |
1312 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 1313 | if (!bh->b_data) |
1da177e4 | 1314 | goto abort; |
41aa1706 BP |
1315 | b_allocd = (1 << order) * PAGE_SIZE; |
1316 | pages &= (order-1); | |
1317 | ||
1da177e4 | 1318 | if (clear) |
41aa1706 BP |
1319 | memset(bh->b_data, 0, b_allocd); |
1320 | bh->b_reqnext = NULL; | |
1321 | bh->b_size = b_allocd; | |
1da177e4 LT |
1322 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1323 | ||
41aa1706 BP |
1324 | while (pages) { |
1325 | order = fls(pages) - 1; | |
1326 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
5a04cfa9 | 1327 | if (!b_data) |
1da177e4 | 1328 | goto abort; |
41aa1706 BP |
1329 | b_allocd = (1 << order) * PAGE_SIZE; |
1330 | ||
1da177e4 | 1331 | if (clear) |
41aa1706 BP |
1332 | memset(b_data, 0, b_allocd); |
1333 | ||
1334 | /* newly allocated page frames below buffer header or ...*/ | |
1335 | if (bh->b_data == b_data + b_allocd) { | |
1336 | bh->b_size += b_allocd; | |
1337 | bh->b_data -= b_allocd; | |
1da177e4 | 1338 | if (full) |
41aa1706 | 1339 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1340 | continue; |
1341 | } | |
41aa1706 | 1342 | /* they are above the header */ |
1da177e4 | 1343 | if (b_data == bh->b_data + bh->b_size) { |
41aa1706 | 1344 | bh->b_size += b_allocd; |
1da177e4 | 1345 | if (full) |
41aa1706 | 1346 | atomic_add(b_allocd, &bh->b_count); |
1da177e4 LT |
1347 | continue; |
1348 | } | |
1349 | prev_bh = bh; | |
5a04cfa9 BP |
1350 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
1351 | if (!bh) { | |
41aa1706 | 1352 | free_pages((unsigned long) b_data, order); |
1da177e4 LT |
1353 | goto abort; |
1354 | } | |
1355 | bh->b_reqnext = NULL; | |
1356 | bh->b_data = b_data; | |
41aa1706 | 1357 | bh->b_size = b_allocd; |
1da177e4 LT |
1358 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
1359 | prev_bh->b_reqnext = bh; | |
41aa1706 BP |
1360 | |
1361 | pages &= (order-1); | |
1da177e4 | 1362 | } |
41aa1706 | 1363 | |
1da177e4 LT |
1364 | bh->b_size -= tape->excess_bh_size; |
1365 | if (full) | |
1366 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
077e3bdb | 1367 | return merge_bh; |
1da177e4 | 1368 | abort: |
077e3bdb | 1369 | ide_tape_kfree_buffer(tape); |
1da177e4 LT |
1370 | return NULL; |
1371 | } | |
1372 | ||
5a04cfa9 | 1373 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
8646c88f | 1374 | const char __user *buf, int n) |
1da177e4 LT |
1375 | { |
1376 | struct idetape_bh *bh = tape->bh; | |
1377 | int count; | |
dcd96379 | 1378 | int ret = 0; |
1da177e4 LT |
1379 | |
1380 | while (n) { | |
1da177e4 | 1381 | if (bh == NULL) { |
5a04cfa9 BP |
1382 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1383 | __func__); | |
dcd96379 | 1384 | return 1; |
1da177e4 | 1385 | } |
5a04cfa9 BP |
1386 | count = min((unsigned int) |
1387 | (bh->b_size - atomic_read(&bh->b_count)), | |
1388 | (unsigned int)n); | |
1389 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
1390 | count)) | |
dcd96379 | 1391 | ret = 1; |
1da177e4 LT |
1392 | n -= count; |
1393 | atomic_add(count, &bh->b_count); | |
1394 | buf += count; | |
1395 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
1396 | bh = bh->b_reqnext; | |
1397 | if (bh) | |
1398 | atomic_set(&bh->b_count, 0); | |
1399 | } | |
1400 | } | |
1401 | tape->bh = bh; | |
dcd96379 | 1402 | return ret; |
1da177e4 LT |
1403 | } |
1404 | ||
5a04cfa9 | 1405 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
99d74e61 | 1406 | int n) |
1da177e4 LT |
1407 | { |
1408 | struct idetape_bh *bh = tape->bh; | |
1409 | int count; | |
dcd96379 | 1410 | int ret = 0; |
1da177e4 LT |
1411 | |
1412 | while (n) { | |
1da177e4 | 1413 | if (bh == NULL) { |
5a04cfa9 BP |
1414 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
1415 | __func__); | |
dcd96379 | 1416 | return 1; |
1da177e4 | 1417 | } |
1da177e4 | 1418 | count = min(tape->b_count, n); |
dcd96379 DW |
1419 | if (copy_to_user(buf, tape->b_data, count)) |
1420 | ret = 1; | |
1da177e4 LT |
1421 | n -= count; |
1422 | tape->b_data += count; | |
1423 | tape->b_count -= count; | |
1424 | buf += count; | |
1425 | if (!tape->b_count) { | |
5a04cfa9 BP |
1426 | bh = bh->b_reqnext; |
1427 | tape->bh = bh; | |
1da177e4 LT |
1428 | if (bh) { |
1429 | tape->b_data = bh->b_data; | |
1430 | tape->b_count = atomic_read(&bh->b_count); | |
1431 | } | |
1432 | } | |
1433 | } | |
dcd96379 | 1434 | return ret; |
1da177e4 LT |
1435 | } |
1436 | ||
077e3bdb | 1437 | static void idetape_init_merge_buffer(idetape_tape_t *tape) |
1da177e4 | 1438 | { |
077e3bdb BP |
1439 | struct idetape_bh *bh = tape->merge_bh; |
1440 | tape->bh = tape->merge_bh; | |
5a04cfa9 | 1441 | |
54abf37e | 1442 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 LT |
1443 | atomic_set(&bh->b_count, 0); |
1444 | else { | |
1445 | tape->b_data = bh->b_data; | |
1446 | tape->b_count = atomic_read(&bh->b_count); | |
1447 | } | |
1448 | } | |
1449 | ||
a2f5b7f4 | 1450 | static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive) |
1da177e4 LT |
1451 | { |
1452 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1453 | u8 *readpos = tape->pc->buf; |
8004a8c9 BP |
1454 | |
1455 | debug_log(DBG_PROCS, "Enter %s\n", __func__); | |
1da177e4 LT |
1456 | |
1457 | if (!tape->pc->error) { | |
a2f5b7f4 BP |
1458 | debug_log(DBG_SENSE, "BOP - %s\n", |
1459 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
1460 | debug_log(DBG_SENSE, "EOP - %s\n", | |
1461 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
1462 | ||
1463 | if (readpos[0] & 0x4) { | |
1464 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
1465 | "to the tape\n"); | |
346331f8 | 1466 | clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); |
1da177e4 LT |
1467 | idetape_end_request(drive, 0, 0); |
1468 | } else { | |
8004a8c9 | 1469 | debug_log(DBG_SENSE, "Block Location - %u\n", |
a2f5b7f4 BP |
1470 | be32_to_cpu(*(u32 *)&readpos[4])); |
1471 | ||
1472 | tape->partition = readpos[1]; | |
54bb2074 | 1473 | tape->first_frame = |
a2f5b7f4 | 1474 | be32_to_cpu(*(u32 *)&readpos[4]); |
346331f8 | 1475 | set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); |
1da177e4 LT |
1476 | idetape_end_request(drive, 1, 0); |
1477 | } | |
1478 | } else { | |
1479 | idetape_end_request(drive, 0, 0); | |
1480 | } | |
1481 | return ide_stopped; | |
1482 | } | |
1483 | ||
1484 | /* | |
3c98bf34 BP |
1485 | * Write a filemark if write_filemark=1. Flush the device buffers without |
1486 | * writing a filemark otherwise. | |
1da177e4 | 1487 | */ |
5a04cfa9 | 1488 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
d236d74c | 1489 | struct ide_atapi_pc *pc, int write_filemark) |
1da177e4 LT |
1490 | { |
1491 | idetape_init_pc(pc); | |
90699ce2 | 1492 | pc->c[0] = WRITE_FILEMARKS; |
1da177e4 | 1493 | pc->c[4] = write_filemark; |
346331f8 | 1494 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
d236d74c | 1495 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1496 | } |
1497 | ||
d236d74c | 1498 | static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1499 | { |
1500 | idetape_init_pc(pc); | |
90699ce2 | 1501 | pc->c[0] = TEST_UNIT_READY; |
d236d74c | 1502 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1503 | } |
1504 | ||
1505 | /* | |
3c98bf34 BP |
1506 | * We add a special packet command request to the tail of the request queue, and |
1507 | * wait for it to be serviced. This is not to be called from within the request | |
1508 | * handling part of the driver! We allocate here data on the stack and it is | |
1509 | * valid until the request is finished. This is not the case for the bottom part | |
1510 | * of the driver, where we are always leaving the functions to wait for an | |
1511 | * interrupt or a timer event. | |
1da177e4 | 1512 | * |
3c98bf34 BP |
1513 | * From the bottom part of the driver, we should allocate safe memory using |
1514 | * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request | |
1515 | * to the request list without waiting for it to be serviced! In that case, we | |
1516 | * usually use idetape_queue_pc_head(). | |
1da177e4 | 1517 | */ |
ea1ab3d3 | 1518 | static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc) |
1da177e4 LT |
1519 | { |
1520 | struct ide_tape_obj *tape = drive->driver_data; | |
1521 | struct request rq; | |
1522 | ||
1523 | idetape_init_rq(&rq, REQ_IDETAPE_PC1); | |
1524 | rq.buffer = (char *) pc; | |
1525 | rq.rq_disk = tape->disk; | |
1526 | return ide_do_drive_cmd(drive, &rq, ide_wait); | |
1527 | } | |
1528 | ||
d236d74c BP |
1529 | static void idetape_create_load_unload_cmd(ide_drive_t *drive, |
1530 | struct ide_atapi_pc *pc, int cmd) | |
1da177e4 LT |
1531 | { |
1532 | idetape_init_pc(pc); | |
90699ce2 | 1533 | pc->c[0] = START_STOP; |
1da177e4 | 1534 | pc->c[4] = cmd; |
346331f8 | 1535 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
d236d74c | 1536 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1537 | } |
1538 | ||
1539 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) | |
1540 | { | |
1541 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1542 | struct ide_atapi_pc pc; |
1da177e4 LT |
1543 | int load_attempted = 0; |
1544 | ||
3c98bf34 | 1545 | /* Wait for the tape to become ready */ |
346331f8 | 1546 | set_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); |
1da177e4 LT |
1547 | timeout += jiffies; |
1548 | while (time_before(jiffies, timeout)) { | |
1549 | idetape_create_test_unit_ready_cmd(&pc); | |
ea1ab3d3 | 1550 | if (!idetape_queue_pc_tail(drive, &pc)) |
1da177e4 LT |
1551 | return 0; |
1552 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
3c98bf34 BP |
1553 | || (tape->asc == 0x3A)) { |
1554 | /* no media */ | |
1da177e4 LT |
1555 | if (load_attempted) |
1556 | return -ENOMEDIUM; | |
5a04cfa9 BP |
1557 | idetape_create_load_unload_cmd(drive, &pc, |
1558 | IDETAPE_LU_LOAD_MASK); | |
ea1ab3d3 | 1559 | idetape_queue_pc_tail(drive, &pc); |
1da177e4 LT |
1560 | load_attempted = 1; |
1561 | /* not about to be ready */ | |
1562 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1563 | (tape->ascq == 1 || tape->ascq == 8))) | |
1564 | return -EIO; | |
80ce45fd | 1565 | msleep(100); |
1da177e4 LT |
1566 | } |
1567 | return -EIO; | |
1568 | } | |
1569 | ||
5a04cfa9 | 1570 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
1da177e4 | 1571 | { |
d236d74c | 1572 | struct ide_atapi_pc pc; |
1da177e4 LT |
1573 | int rc; |
1574 | ||
1575 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
5a04cfa9 BP |
1576 | rc = idetape_queue_pc_tail(drive, &pc); |
1577 | if (rc) | |
1da177e4 LT |
1578 | return rc; |
1579 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1580 | return 0; | |
1581 | } | |
1582 | ||
d236d74c | 1583 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1584 | { |
1585 | idetape_init_pc(pc); | |
90699ce2 | 1586 | pc->c[0] = READ_POSITION; |
d236d74c BP |
1587 | pc->req_xfer = 20; |
1588 | pc->idetape_callback = &idetape_read_position_callback; | |
1da177e4 LT |
1589 | } |
1590 | ||
5a04cfa9 | 1591 | static int idetape_read_position(ide_drive_t *drive) |
1da177e4 LT |
1592 | { |
1593 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1594 | struct ide_atapi_pc pc; |
1da177e4 LT |
1595 | int position; |
1596 | ||
8004a8c9 | 1597 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1da177e4 LT |
1598 | |
1599 | idetape_create_read_position_cmd(&pc); | |
1600 | if (idetape_queue_pc_tail(drive, &pc)) | |
1601 | return -1; | |
54bb2074 | 1602 | position = tape->first_frame; |
1da177e4 LT |
1603 | return position; |
1604 | } | |
1605 | ||
d236d74c BP |
1606 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
1607 | struct ide_atapi_pc *pc, | |
5a04cfa9 | 1608 | unsigned int block, u8 partition, int skip) |
1da177e4 LT |
1609 | { |
1610 | idetape_init_pc(pc); | |
90699ce2 | 1611 | pc->c[0] = POSITION_TO_ELEMENT; |
1da177e4 | 1612 | pc->c[1] = 2; |
860ff5ec | 1613 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
1da177e4 | 1614 | pc->c[8] = partition; |
346331f8 | 1615 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
d236d74c | 1616 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1617 | } |
1618 | ||
d236d74c BP |
1619 | static int idetape_create_prevent_cmd(ide_drive_t *drive, |
1620 | struct ide_atapi_pc *pc, int prevent) | |
1da177e4 LT |
1621 | { |
1622 | idetape_tape_t *tape = drive->driver_data; | |
1623 | ||
b6422013 BP |
1624 | /* device supports locking according to capabilities page */ |
1625 | if (!(tape->caps[6] & 0x01)) | |
1da177e4 LT |
1626 | return 0; |
1627 | ||
1628 | idetape_init_pc(pc); | |
90699ce2 | 1629 | pc->c[0] = ALLOW_MEDIUM_REMOVAL; |
1da177e4 | 1630 | pc->c[4] = prevent; |
d236d74c | 1631 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1632 | return 1; |
1633 | } | |
1634 | ||
ec0fdb01 | 1635 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1636 | { |
1637 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1638 | |
54abf37e | 1639 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
9798630a | 1640 | return; |
1da177e4 | 1641 | |
83042b24 | 1642 | clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags); |
01a63aeb | 1643 | tape->merge_bh_size = 0; |
077e3bdb BP |
1644 | if (tape->merge_bh != NULL) { |
1645 | ide_tape_kfree_buffer(tape); | |
1646 | tape->merge_bh = NULL; | |
1da177e4 LT |
1647 | } |
1648 | ||
54abf37e | 1649 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1650 | } |
1651 | ||
1652 | /* | |
3c98bf34 BP |
1653 | * Position the tape to the requested block using the LOCATE packet command. |
1654 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1655 | * all higher level operations, we queue the commands at the tail of the request | |
1656 | * queue and wait for their completion. | |
1da177e4 | 1657 | */ |
5a04cfa9 BP |
1658 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
1659 | u8 partition, int skip) | |
1da177e4 LT |
1660 | { |
1661 | idetape_tape_t *tape = drive->driver_data; | |
1662 | int retval; | |
d236d74c | 1663 | struct ide_atapi_pc pc; |
1da177e4 | 1664 | |
54abf37e | 1665 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
ec0fdb01 | 1666 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1667 | idetape_wait_ready(drive, 60 * 5 * HZ); |
1668 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
1669 | retval = idetape_queue_pc_tail(drive, &pc); | |
1670 | if (retval) | |
1671 | return (retval); | |
1672 | ||
1673 | idetape_create_read_position_cmd(&pc); | |
1674 | return (idetape_queue_pc_tail(drive, &pc)); | |
1675 | } | |
1676 | ||
ec0fdb01 | 1677 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
5a04cfa9 | 1678 | int restore_position) |
1da177e4 LT |
1679 | { |
1680 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1681 | int seek, position; |
1682 | ||
ec0fdb01 | 1683 | __ide_tape_discard_merge_buffer(drive); |
1da177e4 LT |
1684 | if (restore_position) { |
1685 | position = idetape_read_position(drive); | |
9798630a | 1686 | seek = position > 0 ? position : 0; |
1da177e4 | 1687 | if (idetape_position_tape(drive, seek, 0, 0)) { |
5a04cfa9 | 1688 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
ec0fdb01 | 1689 | " %s\n", tape->name, __func__); |
1da177e4 LT |
1690 | return; |
1691 | } | |
1692 | } | |
1693 | } | |
1694 | ||
1695 | /* | |
3c98bf34 BP |
1696 | * Generate a read/write request for the block device interface and wait for it |
1697 | * to be serviced. | |
1da177e4 | 1698 | */ |
5a04cfa9 BP |
1699 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
1700 | struct idetape_bh *bh) | |
1da177e4 LT |
1701 | { |
1702 | idetape_tape_t *tape = drive->driver_data; | |
1703 | struct request rq; | |
1704 | ||
8004a8c9 BP |
1705 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
1706 | ||
1da177e4 LT |
1707 | idetape_init_rq(&rq, cmd); |
1708 | rq.rq_disk = tape->disk; | |
1709 | rq.special = (void *)bh; | |
54bb2074 | 1710 | rq.sector = tape->first_frame; |
5a04cfa9 BP |
1711 | rq.nr_sectors = blocks; |
1712 | rq.current_nr_sectors = blocks; | |
1da177e4 LT |
1713 | (void) ide_do_drive_cmd(drive, &rq, ide_wait); |
1714 | ||
1715 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1716 | return 0; | |
1717 | ||
077e3bdb BP |
1718 | if (tape->merge_bh) |
1719 | idetape_init_merge_buffer(tape); | |
1da177e4 LT |
1720 | if (rq.errors == IDETAPE_ERROR_GENERAL) |
1721 | return -EIO; | |
54bb2074 | 1722 | return (tape->blk_size * (blocks-rq.current_nr_sectors)); |
1da177e4 LT |
1723 | } |
1724 | ||
d236d74c | 1725 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1726 | { |
1727 | idetape_init_pc(pc); | |
90699ce2 | 1728 | pc->c[0] = INQUIRY; |
5a04cfa9 | 1729 | pc->c[4] = 254; |
d236d74c BP |
1730 | pc->req_xfer = 254; |
1731 | pc->idetape_callback = &idetape_pc_callback; | |
1da177e4 LT |
1732 | } |
1733 | ||
d236d74c BP |
1734 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
1735 | struct ide_atapi_pc *pc) | |
1da177e4 LT |
1736 | { |
1737 | idetape_init_pc(pc); | |
90699ce2 | 1738 | pc->c[0] = REZERO_UNIT; |
346331f8 | 1739 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
d236d74c | 1740 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1741 | } |
1742 | ||
d236d74c | 1743 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
1da177e4 LT |
1744 | { |
1745 | idetape_init_pc(pc); | |
90699ce2 | 1746 | pc->c[0] = ERASE; |
1da177e4 | 1747 | pc->c[1] = 1; |
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_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
1da177e4 LT |
1753 | { |
1754 | idetape_init_pc(pc); | |
90699ce2 | 1755 | pc->c[0] = SPACE; |
860ff5ec | 1756 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
1da177e4 | 1757 | pc->c[1] = cmd; |
346331f8 | 1758 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
d236d74c | 1759 | pc->idetape_callback = &idetape_pc_callback; |
1da177e4 LT |
1760 | } |
1761 | ||
97c566ce | 1762 | /* Queue up a character device originated write request. */ |
5a04cfa9 | 1763 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1764 | { |
1765 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1766 | |
8004a8c9 | 1767 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
1da177e4 | 1768 | |
0aa4b01e | 1769 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
077e3bdb | 1770 | blocks, tape->merge_bh); |
1da177e4 LT |
1771 | } |
1772 | ||
d9df937a | 1773 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
1da177e4 LT |
1774 | { |
1775 | idetape_tape_t *tape = drive->driver_data; | |
1776 | int blocks, min; | |
1777 | struct idetape_bh *bh; | |
55a5d291 | 1778 | |
54abf37e | 1779 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
077e3bdb | 1780 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
5a04cfa9 | 1781 | " but we are not writing.\n"); |
1da177e4 LT |
1782 | return; |
1783 | } | |
01a63aeb | 1784 | if (tape->merge_bh_size > tape->buffer_size) { |
1da177e4 | 1785 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
01a63aeb | 1786 | tape->merge_bh_size = tape->buffer_size; |
1da177e4 | 1787 | } |
01a63aeb BP |
1788 | if (tape->merge_bh_size) { |
1789 | blocks = tape->merge_bh_size / tape->blk_size; | |
1790 | if (tape->merge_bh_size % tape->blk_size) { | |
1da177e4 LT |
1791 | unsigned int i; |
1792 | ||
1793 | blocks++; | |
01a63aeb | 1794 | i = tape->blk_size - tape->merge_bh_size % |
54bb2074 | 1795 | tape->blk_size; |
1da177e4 LT |
1796 | bh = tape->bh->b_reqnext; |
1797 | while (bh) { | |
1798 | atomic_set(&bh->b_count, 0); | |
1799 | bh = bh->b_reqnext; | |
1800 | } | |
1801 | bh = tape->bh; | |
1802 | while (i) { | |
1803 | if (bh == NULL) { | |
5a04cfa9 BP |
1804 | printk(KERN_INFO "ide-tape: bug," |
1805 | " bh NULL\n"); | |
1da177e4 LT |
1806 | break; |
1807 | } | |
5a04cfa9 BP |
1808 | min = min(i, (unsigned int)(bh->b_size - |
1809 | atomic_read(&bh->b_count))); | |
1810 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1811 | 0, min); | |
1da177e4 LT |
1812 | atomic_add(min, &bh->b_count); |
1813 | i -= min; | |
1814 | bh = bh->b_reqnext; | |
1815 | } | |
1816 | } | |
1817 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
01a63aeb | 1818 | tape->merge_bh_size = 0; |
1da177e4 | 1819 | } |
077e3bdb BP |
1820 | if (tape->merge_bh != NULL) { |
1821 | ide_tape_kfree_buffer(tape); | |
1822 | tape->merge_bh = NULL; | |
1da177e4 | 1823 | } |
54abf37e | 1824 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1825 | } |
1826 | ||
83042b24 | 1827 | static int idetape_init_read(ide_drive_t *drive) |
1da177e4 LT |
1828 | { |
1829 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1830 | int bytes_read; |
1da177e4 LT |
1831 | |
1832 | /* Initialize read operation */ | |
54abf37e BP |
1833 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1834 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
d9df937a | 1835 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
1836 | idetape_flush_tape_buffers(drive); |
1837 | } | |
077e3bdb | 1838 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 1839 | printk(KERN_ERR "ide-tape: merge_bh_size should be" |
5a04cfa9 | 1840 | " 0 now\n"); |
01a63aeb | 1841 | tape->merge_bh_size = 0; |
1da177e4 | 1842 | } |
077e3bdb BP |
1843 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
1844 | if (!tape->merge_bh) | |
1da177e4 | 1845 | return -ENOMEM; |
54abf37e | 1846 | tape->chrdev_dir = IDETAPE_DIR_READ; |
1da177e4 LT |
1847 | |
1848 | /* | |
3c98bf34 BP |
1849 | * Issue a read 0 command to ensure that DSC handshake is |
1850 | * switched from completion mode to buffer available mode. | |
1851 | * No point in issuing this if DSC overlap isn't supported, some | |
1852 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
1853 | */ |
1854 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
1855 | bytes_read = idetape_queue_rw_tail(drive, |
1856 | REQ_IDETAPE_READ, 0, | |
077e3bdb | 1857 | tape->merge_bh); |
1da177e4 | 1858 | if (bytes_read < 0) { |
077e3bdb BP |
1859 | ide_tape_kfree_buffer(tape); |
1860 | tape->merge_bh = NULL; | |
54abf37e | 1861 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
1862 | return bytes_read; |
1863 | } | |
1864 | } | |
1865 | } | |
5e69bd95 | 1866 | |
1da177e4 LT |
1867 | return 0; |
1868 | } | |
1869 | ||
5bd50dc6 | 1870 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
5a04cfa9 | 1871 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
1da177e4 LT |
1872 | { |
1873 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 1874 | |
8004a8c9 | 1875 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
1da177e4 | 1876 | |
3c98bf34 | 1877 | /* If we are at a filemark, return a read length of 0 */ |
346331f8 | 1878 | if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
1da177e4 LT |
1879 | return 0; |
1880 | ||
83042b24 | 1881 | idetape_init_read(drive); |
5e69bd95 | 1882 | |
5e69bd95 | 1883 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
077e3bdb | 1884 | tape->merge_bh); |
1da177e4 LT |
1885 | } |
1886 | ||
5a04cfa9 | 1887 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
1da177e4 LT |
1888 | { |
1889 | idetape_tape_t *tape = drive->driver_data; | |
1890 | struct idetape_bh *bh; | |
1891 | int blocks; | |
3c98bf34 | 1892 | |
1da177e4 LT |
1893 | while (bcount) { |
1894 | unsigned int count; | |
1895 | ||
077e3bdb | 1896 | bh = tape->merge_bh; |
f73850a3 | 1897 | count = min(tape->buffer_size, bcount); |
1da177e4 | 1898 | bcount -= count; |
54bb2074 | 1899 | blocks = count / tape->blk_size; |
1da177e4 | 1900 | while (count) { |
5a04cfa9 BP |
1901 | atomic_set(&bh->b_count, |
1902 | min(count, (unsigned int)bh->b_size)); | |
1da177e4 LT |
1903 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
1904 | count -= atomic_read(&bh->b_count); | |
1905 | bh = bh->b_reqnext; | |
1906 | } | |
5a04cfa9 | 1907 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
077e3bdb | 1908 | tape->merge_bh); |
1da177e4 LT |
1909 | } |
1910 | } | |
1911 | ||
1da177e4 | 1912 | /* |
3c98bf34 BP |
1913 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1914 | * currently support only one partition. | |
1915 | */ | |
5a04cfa9 | 1916 | static int idetape_rewind_tape(ide_drive_t *drive) |
1da177e4 LT |
1917 | { |
1918 | int retval; | |
d236d74c | 1919 | struct ide_atapi_pc pc; |
8004a8c9 BP |
1920 | idetape_tape_t *tape; |
1921 | tape = drive->driver_data; | |
1922 | ||
1923 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1924 | ||
1da177e4 LT |
1925 | idetape_create_rewind_cmd(drive, &pc); |
1926 | retval = idetape_queue_pc_tail(drive, &pc); | |
1927 | if (retval) | |
1928 | return retval; | |
1929 | ||
1930 | idetape_create_read_position_cmd(&pc); | |
1931 | retval = idetape_queue_pc_tail(drive, &pc); | |
1932 | if (retval) | |
1933 | return retval; | |
1934 | return 0; | |
1935 | } | |
1936 | ||
3c98bf34 | 1937 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
5a04cfa9 BP |
1938 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1939 | unsigned long arg) | |
1da177e4 LT |
1940 | { |
1941 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 LT |
1942 | void __user *argp = (void __user *)arg; |
1943 | ||
d59823fa BP |
1944 | struct idetape_config { |
1945 | int dsc_rw_frequency; | |
1946 | int dsc_media_access_frequency; | |
1947 | int nr_stages; | |
1948 | } config; | |
1949 | ||
8004a8c9 BP |
1950 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
1951 | ||
1da177e4 | 1952 | switch (cmd) { |
5a04cfa9 BP |
1953 | case 0x0340: |
1954 | if (copy_from_user(&config, argp, sizeof(config))) | |
1955 | return -EFAULT; | |
1956 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
5a04cfa9 BP |
1957 | break; |
1958 | case 0x0350: | |
1959 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
83042b24 | 1960 | config.nr_stages = 1; |
5a04cfa9 BP |
1961 | if (copy_to_user(argp, &config, sizeof(config))) |
1962 | return -EFAULT; | |
1963 | break; | |
1964 | default: | |
1965 | return -EIO; | |
1da177e4 LT |
1966 | } |
1967 | return 0; | |
1968 | } | |
1969 | ||
5a04cfa9 BP |
1970 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1971 | int mt_count) | |
1da177e4 LT |
1972 | { |
1973 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 1974 | struct ide_atapi_pc pc; |
5a04cfa9 | 1975 | int retval, count = 0; |
b6422013 | 1976 | int sprev = !!(tape->caps[4] & 0x20); |
1da177e4 LT |
1977 | |
1978 | if (mt_count == 0) | |
1979 | return 0; | |
1980 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
b6422013 | 1981 | if (!sprev) |
1da177e4 | 1982 | return -EIO; |
5a04cfa9 | 1983 | mt_count = -mt_count; |
1da177e4 LT |
1984 | } |
1985 | ||
54abf37e | 1986 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
01a63aeb | 1987 | tape->merge_bh_size = 0; |
346331f8 | 1988 | if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
1da177e4 | 1989 | ++count; |
ec0fdb01 | 1990 | ide_tape_discard_merge_buffer(drive, 0); |
1da177e4 LT |
1991 | } |
1992 | ||
1da177e4 | 1993 | switch (mt_op) { |
5a04cfa9 BP |
1994 | case MTFSF: |
1995 | case MTBSF: | |
1996 | idetape_create_space_cmd(&pc, mt_count - count, | |
1997 | IDETAPE_SPACE_OVER_FILEMARK); | |
1998 | return idetape_queue_pc_tail(drive, &pc); | |
1999 | case MTFSFM: | |
2000 | case MTBSFM: | |
2001 | if (!sprev) | |
2002 | return -EIO; | |
2003 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
2004 | mt_count - count); | |
2005 | if (retval) | |
2006 | return retval; | |
2007 | count = (MTBSFM == mt_op ? 1 : -1); | |
2008 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
2009 | default: | |
2010 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
2011 | mt_op); | |
2012 | return -EIO; | |
1da177e4 LT |
2013 | } |
2014 | } | |
2015 | ||
1da177e4 | 2016 | /* |
3c98bf34 | 2017 | * Our character device read / write functions. |
1da177e4 | 2018 | * |
3c98bf34 BP |
2019 | * The tape is optimized to maximize throughput when it is transferring an |
2020 | * integral number of the "continuous transfer limit", which is a parameter of | |
2021 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1da177e4 | 2022 | * |
3c98bf34 BP |
2023 | * As of version 1.3 of the driver, the character device provides an abstract |
2024 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
2025 | * same backup/restore procedure is supported. The driver will internally | |
2026 | * convert the requests to the recommended transfer unit, so that an unmatch | |
2027 | * between the user's block size to the recommended size will only result in a | |
2028 | * (slightly) increased driver overhead, but will no longer hit performance. | |
2029 | * This is not applicable to Onstream. | |
1da177e4 | 2030 | */ |
5a04cfa9 BP |
2031 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
2032 | size_t count, loff_t *ppos) | |
1da177e4 LT |
2033 | { |
2034 | struct ide_tape_obj *tape = ide_tape_f(file); | |
2035 | ide_drive_t *drive = tape->drive; | |
5a04cfa9 | 2036 | ssize_t bytes_read, temp, actually_read = 0, rc; |
dcd96379 | 2037 | ssize_t ret = 0; |
b6422013 | 2038 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 | 2039 | |
8004a8c9 | 2040 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 | 2041 | |
54abf37e | 2042 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
346331f8 | 2043 | if (test_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags)) |
54bb2074 BP |
2044 | if (count > tape->blk_size && |
2045 | (count % tape->blk_size) == 0) | |
2046 | tape->user_bs_factor = count / tape->blk_size; | |
1da177e4 | 2047 | } |
83042b24 | 2048 | rc = idetape_init_read(drive); |
8d06bfad | 2049 | if (rc < 0) |
1da177e4 LT |
2050 | return rc; |
2051 | if (count == 0) | |
2052 | return (0); | |
01a63aeb BP |
2053 | if (tape->merge_bh_size) { |
2054 | actually_read = min((unsigned int)(tape->merge_bh_size), | |
5a04cfa9 | 2055 | (unsigned int)count); |
99d74e61 | 2056 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
dcd96379 | 2057 | ret = -EFAULT; |
1da177e4 | 2058 | buf += actually_read; |
01a63aeb | 2059 | tape->merge_bh_size -= actually_read; |
1da177e4 LT |
2060 | count -= actually_read; |
2061 | } | |
f73850a3 | 2062 | while (count >= tape->buffer_size) { |
b6422013 | 2063 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
2064 | if (bytes_read <= 0) |
2065 | goto finish; | |
99d74e61 | 2066 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
dcd96379 | 2067 | ret = -EFAULT; |
1da177e4 LT |
2068 | buf += bytes_read; |
2069 | count -= bytes_read; | |
2070 | actually_read += bytes_read; | |
2071 | } | |
2072 | if (count) { | |
b6422013 | 2073 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
1da177e4 LT |
2074 | if (bytes_read <= 0) |
2075 | goto finish; | |
2076 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
99d74e61 | 2077 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
dcd96379 | 2078 | ret = -EFAULT; |
1da177e4 | 2079 | actually_read += temp; |
01a63aeb | 2080 | tape->merge_bh_size = bytes_read-temp; |
1da177e4 LT |
2081 | } |
2082 | finish: | |
346331f8 | 2083 | if (!actually_read && test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) { |
8004a8c9 BP |
2084 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
2085 | ||
1da177e4 LT |
2086 | idetape_space_over_filemarks(drive, MTFSF, 1); |
2087 | return 0; | |
2088 | } | |
dcd96379 | 2089 | |
5a04cfa9 | 2090 | return ret ? ret : actually_read; |
1da177e4 LT |
2091 | } |
2092 | ||
5a04cfa9 | 2093 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1da177e4 LT |
2094 | size_t count, loff_t *ppos) |
2095 | { | |
2096 | struct ide_tape_obj *tape = ide_tape_f(file); | |
2097 | ide_drive_t *drive = tape->drive; | |
dcd96379 DW |
2098 | ssize_t actually_written = 0; |
2099 | ssize_t ret = 0; | |
b6422013 | 2100 | u16 ctl = *(u16 *)&tape->caps[12]; |
1da177e4 LT |
2101 | |
2102 | /* The drive is write protected. */ | |
2103 | if (tape->write_prot) | |
2104 | return -EACCES; | |
2105 | ||
8004a8c9 | 2106 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
1da177e4 LT |
2107 | |
2108 | /* Initialize write operation */ | |
54abf37e BP |
2109 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
2110 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 2111 | ide_tape_discard_merge_buffer(drive, 1); |
077e3bdb | 2112 | if (tape->merge_bh || tape->merge_bh_size) { |
01a63aeb | 2113 | printk(KERN_ERR "ide-tape: merge_bh_size " |
1da177e4 | 2114 | "should be 0 now\n"); |
01a63aeb | 2115 | tape->merge_bh_size = 0; |
1da177e4 | 2116 | } |
077e3bdb BP |
2117 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
2118 | if (!tape->merge_bh) | |
1da177e4 | 2119 | return -ENOMEM; |
54abf37e | 2120 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
077e3bdb | 2121 | idetape_init_merge_buffer(tape); |
1da177e4 LT |
2122 | |
2123 | /* | |
3c98bf34 BP |
2124 | * Issue a write 0 command to ensure that DSC handshake is |
2125 | * switched from completion mode to buffer available mode. No | |
2126 | * point in issuing this if DSC overlap isn't supported, some | |
2127 | * drives (Seagate STT3401A) will return an error. | |
1da177e4 LT |
2128 | */ |
2129 | if (drive->dsc_overlap) { | |
5a04cfa9 BP |
2130 | ssize_t retval = idetape_queue_rw_tail(drive, |
2131 | REQ_IDETAPE_WRITE, 0, | |
077e3bdb | 2132 | tape->merge_bh); |
1da177e4 | 2133 | if (retval < 0) { |
077e3bdb BP |
2134 | ide_tape_kfree_buffer(tape); |
2135 | tape->merge_bh = NULL; | |
54abf37e | 2136 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 LT |
2137 | return retval; |
2138 | } | |
2139 | } | |
2140 | } | |
2141 | if (count == 0) | |
2142 | return (0); | |
01a63aeb BP |
2143 | if (tape->merge_bh_size) { |
2144 | if (tape->merge_bh_size >= tape->buffer_size) { | |
5a04cfa9 | 2145 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
01a63aeb | 2146 | tape->merge_bh_size = 0; |
1da177e4 | 2147 | } |
5a04cfa9 | 2148 | actually_written = min((unsigned int) |
01a63aeb | 2149 | (tape->buffer_size - tape->merge_bh_size), |
5a04cfa9 | 2150 | (unsigned int)count); |
8646c88f | 2151 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
dcd96379 | 2152 | ret = -EFAULT; |
1da177e4 | 2153 | buf += actually_written; |
01a63aeb | 2154 | tape->merge_bh_size += actually_written; |
1da177e4 LT |
2155 | count -= actually_written; |
2156 | ||
01a63aeb | 2157 | if (tape->merge_bh_size == tape->buffer_size) { |
dcd96379 | 2158 | ssize_t retval; |
01a63aeb | 2159 | tape->merge_bh_size = 0; |
b6422013 | 2160 | retval = idetape_add_chrdev_write_request(drive, ctl); |
1da177e4 LT |
2161 | if (retval <= 0) |
2162 | return (retval); | |
2163 | } | |
2164 | } | |
f73850a3 | 2165 | while (count >= tape->buffer_size) { |
dcd96379 | 2166 | ssize_t retval; |
f73850a3 | 2167 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
dcd96379 | 2168 | ret = -EFAULT; |
f73850a3 BP |
2169 | buf += tape->buffer_size; |
2170 | count -= tape->buffer_size; | |
b6422013 | 2171 | retval = idetape_add_chrdev_write_request(drive, ctl); |
f73850a3 | 2172 | actually_written += tape->buffer_size; |
1da177e4 LT |
2173 | if (retval <= 0) |
2174 | return (retval); | |
2175 | } | |
2176 | if (count) { | |
2177 | actually_written += count; | |
8646c88f | 2178 | if (idetape_copy_stage_from_user(tape, buf, count)) |
dcd96379 | 2179 | ret = -EFAULT; |
01a63aeb | 2180 | tape->merge_bh_size += count; |
1da177e4 | 2181 | } |
5a04cfa9 | 2182 | return ret ? ret : actually_written; |
1da177e4 LT |
2183 | } |
2184 | ||
5a04cfa9 | 2185 | static int idetape_write_filemark(ide_drive_t *drive) |
1da177e4 | 2186 | { |
d236d74c | 2187 | struct ide_atapi_pc pc; |
1da177e4 LT |
2188 | |
2189 | /* Write a filemark */ | |
2190 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
2191 | if (idetape_queue_pc_tail(drive, &pc)) { | |
2192 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); | |
2193 | return -EIO; | |
2194 | } | |
2195 | return 0; | |
2196 | } | |
2197 | ||
2198 | /* | |
d99c9da2 BP |
2199 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
2200 | * requested. | |
1da177e4 | 2201 | * |
d99c9da2 BP |
2202 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
2203 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
5bd50dc6 | 2204 | * usually not supported. |
1da177e4 | 2205 | * |
d99c9da2 | 2206 | * The following commands are currently not supported: |
1da177e4 | 2207 | * |
d99c9da2 BP |
2208 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
2209 | * MT_ST_WRITE_THRESHOLD. | |
1da177e4 | 2210 | */ |
d99c9da2 | 2211 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1da177e4 LT |
2212 | { |
2213 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2214 | struct ide_atapi_pc pc; |
5a04cfa9 | 2215 | int i, retval; |
1da177e4 | 2216 | |
8004a8c9 BP |
2217 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
2218 | mt_op, mt_count); | |
5a04cfa9 | 2219 | |
1da177e4 | 2220 | switch (mt_op) { |
5a04cfa9 BP |
2221 | case MTFSF: |
2222 | case MTFSFM: | |
2223 | case MTBSF: | |
2224 | case MTBSFM: | |
2225 | if (!mt_count) | |
2226 | return 0; | |
2227 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
2228 | default: | |
2229 | break; | |
1da177e4 | 2230 | } |
5a04cfa9 | 2231 | |
1da177e4 | 2232 | switch (mt_op) { |
5a04cfa9 BP |
2233 | case MTWEOF: |
2234 | if (tape->write_prot) | |
2235 | return -EACCES; | |
ec0fdb01 | 2236 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 BP |
2237 | for (i = 0; i < mt_count; i++) { |
2238 | retval = idetape_write_filemark(drive); | |
2239 | if (retval) | |
2240 | return retval; | |
2241 | } | |
2242 | return 0; | |
2243 | case MTREW: | |
ec0fdb01 | 2244 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2245 | if (idetape_rewind_tape(drive)) |
2246 | return -EIO; | |
2247 | return 0; | |
2248 | case MTLOAD: | |
ec0fdb01 | 2249 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2250 | idetape_create_load_unload_cmd(drive, &pc, |
2251 | IDETAPE_LU_LOAD_MASK); | |
2252 | return idetape_queue_pc_tail(drive, &pc); | |
2253 | case MTUNLOAD: | |
2254 | case MTOFFL: | |
2255 | /* | |
2256 | * If door is locked, attempt to unlock before | |
2257 | * attempting to eject. | |
2258 | */ | |
2259 | if (tape->door_locked) { | |
2260 | if (idetape_create_prevent_cmd(drive, &pc, 0)) | |
2261 | if (!idetape_queue_pc_tail(drive, &pc)) | |
2262 | tape->door_locked = DOOR_UNLOCKED; | |
2263 | } | |
ec0fdb01 | 2264 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2265 | idetape_create_load_unload_cmd(drive, &pc, |
2266 | !IDETAPE_LU_LOAD_MASK); | |
2267 | retval = idetape_queue_pc_tail(drive, &pc); | |
2268 | if (!retval) | |
346331f8 | 2269 | clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); |
5a04cfa9 BP |
2270 | return retval; |
2271 | case MTNOP: | |
ec0fdb01 | 2272 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2273 | return idetape_flush_tape_buffers(drive); |
2274 | case MTRETEN: | |
ec0fdb01 | 2275 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2276 | idetape_create_load_unload_cmd(drive, &pc, |
2277 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); | |
2278 | return idetape_queue_pc_tail(drive, &pc); | |
2279 | case MTEOM: | |
2280 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
2281 | return idetape_queue_pc_tail(drive, &pc); | |
2282 | case MTERASE: | |
2283 | (void)idetape_rewind_tape(drive); | |
2284 | idetape_create_erase_cmd(&pc); | |
2285 | return idetape_queue_pc_tail(drive, &pc); | |
2286 | case MTSETBLK: | |
2287 | if (mt_count) { | |
2288 | if (mt_count < tape->blk_size || | |
2289 | mt_count % tape->blk_size) | |
1da177e4 | 2290 | return -EIO; |
5a04cfa9 | 2291 | tape->user_bs_factor = mt_count / tape->blk_size; |
346331f8 | 2292 | clear_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); |
5a04cfa9 | 2293 | } else |
346331f8 | 2294 | set_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); |
5a04cfa9 BP |
2295 | return 0; |
2296 | case MTSEEK: | |
ec0fdb01 | 2297 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2298 | return idetape_position_tape(drive, |
2299 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
2300 | case MTSETPART: | |
ec0fdb01 | 2301 | ide_tape_discard_merge_buffer(drive, 0); |
5a04cfa9 BP |
2302 | return idetape_position_tape(drive, 0, mt_count, 0); |
2303 | case MTFSR: | |
2304 | case MTBSR: | |
2305 | case MTLOCK: | |
2306 | if (!idetape_create_prevent_cmd(drive, &pc, 1)) | |
1da177e4 | 2307 | return 0; |
5a04cfa9 BP |
2308 | retval = idetape_queue_pc_tail(drive, &pc); |
2309 | if (retval) | |
1da177e4 | 2310 | return retval; |
5a04cfa9 BP |
2311 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
2312 | return 0; | |
2313 | case MTUNLOCK: | |
2314 | if (!idetape_create_prevent_cmd(drive, &pc, 0)) | |
1da177e4 | 2315 | return 0; |
5a04cfa9 BP |
2316 | retval = idetape_queue_pc_tail(drive, &pc); |
2317 | if (retval) | |
2318 | return retval; | |
2319 | tape->door_locked = DOOR_UNLOCKED; | |
2320 | return 0; | |
2321 | default: | |
2322 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
2323 | mt_op); | |
2324 | return -EIO; | |
1da177e4 LT |
2325 | } |
2326 | } | |
2327 | ||
2328 | /* | |
d99c9da2 BP |
2329 | * Our character device ioctls. General mtio.h magnetic io commands are |
2330 | * supported here, and not in the corresponding block interface. Our own | |
2331 | * ide-tape ioctls are supported on both interfaces. | |
1da177e4 | 2332 | */ |
d99c9da2 BP |
2333 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
2334 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
2335 | { |
2336 | struct ide_tape_obj *tape = ide_tape_f(file); | |
2337 | ide_drive_t *drive = tape->drive; | |
2338 | struct mtop mtop; | |
2339 | struct mtget mtget; | |
2340 | struct mtpos mtpos; | |
54bb2074 | 2341 | int block_offset = 0, position = tape->first_frame; |
1da177e4 LT |
2342 | void __user *argp = (void __user *)arg; |
2343 | ||
8004a8c9 | 2344 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
1da177e4 | 2345 | |
54abf37e | 2346 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
d9df937a | 2347 | ide_tape_flush_merge_buffer(drive); |
1da177e4 LT |
2348 | idetape_flush_tape_buffers(drive); |
2349 | } | |
2350 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
01a63aeb | 2351 | block_offset = tape->merge_bh_size / |
54bb2074 | 2352 | (tape->blk_size * tape->user_bs_factor); |
5a04cfa9 BP |
2353 | position = idetape_read_position(drive); |
2354 | if (position < 0) | |
1da177e4 LT |
2355 | return -EIO; |
2356 | } | |
2357 | switch (cmd) { | |
5a04cfa9 BP |
2358 | case MTIOCTOP: |
2359 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
2360 | return -EFAULT; | |
2361 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
2362 | case MTIOCGET: | |
2363 | memset(&mtget, 0, sizeof(struct mtget)); | |
2364 | mtget.mt_type = MT_ISSCSI2; | |
2365 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2366 | mtget.mt_dsreg = | |
2367 | ((tape->blk_size * tape->user_bs_factor) | |
2368 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
2369 | ||
2370 | if (tape->drv_write_prot) | |
2371 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
2372 | ||
2373 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
2374 | return -EFAULT; | |
2375 | return 0; | |
2376 | case MTIOCPOS: | |
2377 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
2378 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
2379 | return -EFAULT; | |
2380 | return 0; | |
2381 | default: | |
2382 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
ec0fdb01 | 2383 | ide_tape_discard_merge_buffer(drive, 1); |
5a04cfa9 | 2384 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1da177e4 LT |
2385 | } |
2386 | } | |
2387 | ||
3cffb9ce BP |
2388 | /* |
2389 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
2390 | * block size with the reported value. | |
2391 | */ | |
2392 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
2393 | { | |
2394 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2395 | struct ide_atapi_pc pc; |
3cffb9ce BP |
2396 | |
2397 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
2398 | if (idetape_queue_pc_tail(drive, &pc)) { | |
2399 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); | |
54bb2074 | 2400 | if (tape->blk_size == 0) { |
3cffb9ce BP |
2401 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
2402 | "block size, assuming 32k\n"); | |
54bb2074 | 2403 | tape->blk_size = 32768; |
3cffb9ce BP |
2404 | } |
2405 | return; | |
2406 | } | |
d236d74c BP |
2407 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
2408 | (pc.buf[4 + 6] << 8) + | |
2409 | pc.buf[4 + 7]; | |
2410 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
3cffb9ce | 2411 | } |
1da177e4 | 2412 | |
5a04cfa9 | 2413 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1da177e4 LT |
2414 | { |
2415 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
2416 | ide_drive_t *drive; | |
2417 | idetape_tape_t *tape; | |
d236d74c | 2418 | struct ide_atapi_pc pc; |
1da177e4 LT |
2419 | int retval; |
2420 | ||
8004a8c9 BP |
2421 | if (i >= MAX_HWIFS * MAX_DRIVES) |
2422 | return -ENXIO; | |
2423 | ||
2424 | tape = ide_tape_chrdev_get(i); | |
2425 | if (!tape) | |
2426 | return -ENXIO; | |
2427 | ||
2428 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
2429 | ||
1da177e4 LT |
2430 | /* |
2431 | * We really want to do nonseekable_open(inode, filp); here, but some | |
2432 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
2433 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
2434 | */ | |
2435 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
2436 | ||
1da177e4 LT |
2437 | drive = tape->drive; |
2438 | ||
2439 | filp->private_data = tape; | |
2440 | ||
346331f8 | 2441 | if (test_and_set_bit(IDETAPE_FLAG_BUSY, &tape->flags)) { |
1da177e4 LT |
2442 | retval = -EBUSY; |
2443 | goto out_put_tape; | |
2444 | } | |
2445 | ||
2446 | retval = idetape_wait_ready(drive, 60 * HZ); | |
2447 | if (retval) { | |
346331f8 | 2448 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
1da177e4 LT |
2449 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
2450 | goto out_put_tape; | |
2451 | } | |
2452 | ||
2453 | idetape_read_position(drive); | |
346331f8 | 2454 | if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags)) |
1da177e4 LT |
2455 | (void)idetape_rewind_tape(drive); |
2456 | ||
1da177e4 | 2457 | /* Read block size and write protect status from drive. */ |
3cffb9ce | 2458 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 LT |
2459 | |
2460 | /* Set write protect flag if device is opened as read-only. */ | |
2461 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
2462 | tape->write_prot = 1; | |
2463 | else | |
2464 | tape->write_prot = tape->drv_write_prot; | |
2465 | ||
2466 | /* Make sure drive isn't write protected if user wants to write. */ | |
2467 | if (tape->write_prot) { | |
2468 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
2469 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
346331f8 | 2470 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
1da177e4 LT |
2471 | retval = -EROFS; |
2472 | goto out_put_tape; | |
2473 | } | |
2474 | } | |
2475 | ||
3c98bf34 | 2476 | /* Lock the tape drive door so user can't eject. */ |
54abf37e | 2477 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 LT |
2478 | if (idetape_create_prevent_cmd(drive, &pc, 1)) { |
2479 | if (!idetape_queue_pc_tail(drive, &pc)) { | |
2480 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) | |
2481 | tape->door_locked = DOOR_LOCKED; | |
2482 | } | |
2483 | } | |
2484 | } | |
1da177e4 LT |
2485 | return 0; |
2486 | ||
2487 | out_put_tape: | |
2488 | ide_tape_put(tape); | |
2489 | return retval; | |
2490 | } | |
2491 | ||
5a04cfa9 | 2492 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1da177e4 LT |
2493 | { |
2494 | idetape_tape_t *tape = drive->driver_data; | |
2495 | ||
d9df937a | 2496 | ide_tape_flush_merge_buffer(drive); |
077e3bdb BP |
2497 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); |
2498 | if (tape->merge_bh != NULL) { | |
54bb2074 BP |
2499 | idetape_pad_zeros(drive, tape->blk_size * |
2500 | (tape->user_bs_factor - 1)); | |
077e3bdb BP |
2501 | ide_tape_kfree_buffer(tape); |
2502 | tape->merge_bh = NULL; | |
1da177e4 LT |
2503 | } |
2504 | idetape_write_filemark(drive); | |
2505 | idetape_flush_tape_buffers(drive); | |
2506 | idetape_flush_tape_buffers(drive); | |
2507 | } | |
2508 | ||
5a04cfa9 | 2509 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1da177e4 LT |
2510 | { |
2511 | struct ide_tape_obj *tape = ide_tape_f(filp); | |
2512 | ide_drive_t *drive = tape->drive; | |
d236d74c | 2513 | struct ide_atapi_pc pc; |
1da177e4 LT |
2514 | unsigned int minor = iminor(inode); |
2515 | ||
2516 | lock_kernel(); | |
2517 | tape = drive->driver_data; | |
8004a8c9 BP |
2518 | |
2519 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1da177e4 | 2520 | |
54abf37e | 2521 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1da177e4 | 2522 | idetape_write_release(drive, minor); |
54abf37e | 2523 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1da177e4 | 2524 | if (minor < 128) |
ec0fdb01 | 2525 | ide_tape_discard_merge_buffer(drive, 1); |
1da177e4 | 2526 | } |
f64eee7b | 2527 | |
346331f8 | 2528 | if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags)) |
1da177e4 | 2529 | (void) idetape_rewind_tape(drive); |
54abf37e | 2530 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1da177e4 LT |
2531 | if (tape->door_locked == DOOR_LOCKED) { |
2532 | if (idetape_create_prevent_cmd(drive, &pc, 0)) { | |
2533 | if (!idetape_queue_pc_tail(drive, &pc)) | |
2534 | tape->door_locked = DOOR_UNLOCKED; | |
2535 | } | |
2536 | } | |
2537 | } | |
346331f8 | 2538 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
1da177e4 LT |
2539 | ide_tape_put(tape); |
2540 | unlock_kernel(); | |
2541 | return 0; | |
2542 | } | |
2543 | ||
2544 | /* | |
71071b8e | 2545 | * check the contents of the ATAPI IDENTIFY command results. We return: |
1da177e4 | 2546 | * |
71071b8e BP |
2547 | * 1 - If the tape can be supported by us, based on the information we have so |
2548 | * far. | |
1da177e4 | 2549 | * |
71071b8e | 2550 | * 0 - If this tape driver is not currently supported by us. |
1da177e4 | 2551 | */ |
71071b8e | 2552 | static int idetape_identify_device(ide_drive_t *drive) |
1da177e4 | 2553 | { |
71071b8e | 2554 | u8 gcw[2], protocol, device_type, removable, packet_size; |
1da177e4 LT |
2555 | |
2556 | if (drive->id_read == 0) | |
2557 | return 1; | |
2558 | ||
71071b8e | 2559 | *((unsigned short *) &gcw) = drive->id->config; |
1da177e4 | 2560 | |
71071b8e BP |
2561 | protocol = (gcw[1] & 0xC0) >> 6; |
2562 | device_type = gcw[1] & 0x1F; | |
2563 | removable = !!(gcw[0] & 0x80); | |
2564 | packet_size = gcw[0] & 0x3; | |
1da177e4 | 2565 | |
71071b8e BP |
2566 | /* Check that we can support this device */ |
2567 | if (protocol != 2) | |
16422de3 | 2568 | printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n", |
71071b8e BP |
2569 | protocol); |
2570 | else if (device_type != 1) | |
16422de3 | 2571 | printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set " |
71071b8e BP |
2572 | "to tape\n", device_type); |
2573 | else if (!removable) | |
1da177e4 | 2574 | printk(KERN_ERR "ide-tape: The removable flag is not set\n"); |
71071b8e | 2575 | else if (packet_size != 0) { |
24d57f8b BP |
2576 | printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12" |
2577 | " bytes\n", packet_size); | |
1da177e4 LT |
2578 | } else |
2579 | return 1; | |
2580 | return 0; | |
2581 | } | |
2582 | ||
6d29c8f0 | 2583 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1da177e4 | 2584 | { |
1da177e4 | 2585 | idetape_tape_t *tape = drive->driver_data; |
d236d74c | 2586 | struct ide_atapi_pc pc; |
41f81d54 | 2587 | char fw_rev[6], vendor_id[10], product_id[18]; |
6d29c8f0 | 2588 | |
1da177e4 LT |
2589 | idetape_create_inquiry_cmd(&pc); |
2590 | if (idetape_queue_pc_tail(drive, &pc)) { | |
6d29c8f0 BP |
2591 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
2592 | tape->name); | |
1da177e4 LT |
2593 | return; |
2594 | } | |
d236d74c BP |
2595 | memcpy(vendor_id, &pc.buf[8], 8); |
2596 | memcpy(product_id, &pc.buf[16], 16); | |
2597 | memcpy(fw_rev, &pc.buf[32], 4); | |
41f81d54 BP |
2598 | |
2599 | ide_fixstring(vendor_id, 10, 0); | |
2600 | ide_fixstring(product_id, 18, 0); | |
2601 | ide_fixstring(fw_rev, 6, 0); | |
2602 | ||
6d29c8f0 | 2603 | printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", |
41f81d54 | 2604 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1da177e4 LT |
2605 | } |
2606 | ||
2607 | /* | |
b6422013 BP |
2608 | * Ask the tape about its various parameters. In particular, we will adjust our |
2609 | * data transfer buffer size to the recommended value as returned by the tape. | |
1da177e4 | 2610 | */ |
5a04cfa9 | 2611 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1da177e4 LT |
2612 | { |
2613 | idetape_tape_t *tape = drive->driver_data; | |
d236d74c | 2614 | struct ide_atapi_pc pc; |
b6422013 BP |
2615 | u8 *caps; |
2616 | u8 speed, max_speed; | |
47314fa4 | 2617 | |
1da177e4 LT |
2618 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
2619 | if (idetape_queue_pc_tail(drive, &pc)) { | |
b6422013 BP |
2620 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
2621 | " some default values\n"); | |
54bb2074 | 2622 | tape->blk_size = 512; |
b6422013 BP |
2623 | put_unaligned(52, (u16 *)&tape->caps[12]); |
2624 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2625 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
1da177e4 LT |
2626 | return; |
2627 | } | |
d236d74c | 2628 | caps = pc.buf + 4 + pc.buf[3]; |
b6422013 BP |
2629 | |
2630 | /* convert to host order and save for later use */ | |
2631 | speed = be16_to_cpu(*(u16 *)&caps[14]); | |
2632 | max_speed = be16_to_cpu(*(u16 *)&caps[8]); | |
1da177e4 | 2633 | |
b6422013 BP |
2634 | put_unaligned(max_speed, (u16 *)&caps[8]); |
2635 | put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]); | |
2636 | put_unaligned(speed, (u16 *)&caps[14]); | |
2637 | put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]); | |
1da177e4 | 2638 | |
b6422013 BP |
2639 | if (!speed) { |
2640 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2641 | "(assuming 650KB/sec)\n", drive->name); | |
2642 | put_unaligned(650, (u16 *)&caps[14]); | |
1da177e4 | 2643 | } |
b6422013 BP |
2644 | if (!max_speed) { |
2645 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2646 | "(assuming 650KB/sec)\n", drive->name); | |
2647 | put_unaligned(650, (u16 *)&caps[8]); | |
1da177e4 LT |
2648 | } |
2649 | ||
b6422013 BP |
2650 | memcpy(&tape->caps, caps, 20); |
2651 | if (caps[7] & 0x02) | |
54bb2074 | 2652 | tape->blk_size = 512; |
b6422013 | 2653 | else if (caps[7] & 0x04) |
54bb2074 | 2654 | tape->blk_size = 1024; |
1da177e4 LT |
2655 | } |
2656 | ||
7662d046 | 2657 | #ifdef CONFIG_IDE_PROC_FS |
5a04cfa9 | 2658 | static void idetape_add_settings(ide_drive_t *drive) |
1da177e4 LT |
2659 | { |
2660 | idetape_tape_t *tape = drive->driver_data; | |
2661 | ||
b6422013 BP |
2662 | ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
2663 | 1, 2, (u16 *)&tape->caps[16], NULL); | |
b6422013 BP |
2664 | ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
2665 | 1, 1, (u16 *)&tape->caps[14], NULL); | |
f73850a3 BP |
2666 | ide_add_setting(drive, "buffer_size", SETTING_READ, TYPE_INT, 0, 0xffff, |
2667 | 1, 1024, &tape->buffer_size, NULL); | |
54bb2074 BP |
2668 | ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, |
2669 | IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq, | |
2670 | NULL); | |
5a04cfa9 BP |
2671 | ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, |
2672 | 1, &drive->dsc_overlap, NULL); | |
5a04cfa9 BP |
2673 | ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, |
2674 | 1, 1, &tape->avg_speed, NULL); | |
8004a8c9 BP |
2675 | ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1, |
2676 | 1, &tape->debug_mask, NULL); | |
1da177e4 | 2677 | } |
7662d046 BZ |
2678 | #else |
2679 | static inline void idetape_add_settings(ide_drive_t *drive) { ; } | |
2680 | #endif | |
1da177e4 LT |
2681 | |
2682 | /* | |
3c98bf34 | 2683 | * The function below is called to: |
1da177e4 | 2684 | * |
3c98bf34 BP |
2685 | * 1. Initialize our various state variables. |
2686 | * 2. Ask the tape for its capabilities. | |
2687 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2688 | * is chosen based on the recommendation which we received in step 2. | |
1da177e4 | 2689 | * |
3c98bf34 BP |
2690 | * Note that at this point ide.c already assigned us an irq, so that we can |
2691 | * queue requests here and wait for their completion. | |
1da177e4 | 2692 | */ |
5a04cfa9 | 2693 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1da177e4 | 2694 | { |
83042b24 | 2695 | unsigned long t; |
1da177e4 | 2696 | int speed; |
f73850a3 | 2697 | int buffer_size; |
71071b8e | 2698 | u8 gcw[2]; |
b6422013 | 2699 | u16 *ctl = (u16 *)&tape->caps[12]; |
1da177e4 | 2700 | |
54bb2074 | 2701 | spin_lock_init(&tape->lock); |
1da177e4 | 2702 | drive->dsc_overlap = 1; |
4166c199 BZ |
2703 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
2704 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2705 | tape->name); | |
2706 | drive->dsc_overlap = 0; | |
1da177e4 | 2707 | } |
1da177e4 LT |
2708 | /* Seagate Travan drives do not support DSC overlap. */ |
2709 | if (strstr(drive->id->model, "Seagate STT3401")) | |
2710 | drive->dsc_overlap = 0; | |
2711 | tape->minor = minor; | |
2712 | tape->name[0] = 'h'; | |
2713 | tape->name[1] = 't'; | |
2714 | tape->name[2] = '0' + minor; | |
54abf37e | 2715 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1da177e4 | 2716 | tape->pc = tape->pc_stack; |
1da177e4 | 2717 | *((unsigned short *) &gcw) = drive->id->config; |
71071b8e BP |
2718 | |
2719 | /* Command packet DRQ type */ | |
2720 | if (((gcw[0] & 0x60) >> 5) == 1) | |
346331f8 | 2721 | set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags); |
1da177e4 | 2722 | |
1da177e4 LT |
2723 | idetape_get_inquiry_results(drive); |
2724 | idetape_get_mode_sense_results(drive); | |
3cffb9ce | 2725 | ide_tape_get_bsize_from_bdesc(drive); |
1da177e4 | 2726 | tape->user_bs_factor = 1; |
f73850a3 BP |
2727 | tape->buffer_size = *ctl * tape->blk_size; |
2728 | while (tape->buffer_size > 0xffff) { | |
1da177e4 | 2729 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
b6422013 | 2730 | *ctl /= 2; |
f73850a3 | 2731 | tape->buffer_size = *ctl * tape->blk_size; |
1da177e4 | 2732 | } |
f73850a3 | 2733 | buffer_size = tape->buffer_size; |
a997a435 | 2734 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
f73850a3 | 2735 | if (buffer_size % PAGE_SIZE) { |
a997a435 | 2736 | tape->pages_per_buffer++; |
f73850a3 | 2737 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
1da177e4 LT |
2738 | } |
2739 | ||
83042b24 | 2740 | /* select the "best" DSC read/write polling freq */ |
b6422013 | 2741 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1da177e4 | 2742 | |
f73850a3 | 2743 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1da177e4 LT |
2744 | |
2745 | /* | |
3c98bf34 BP |
2746 | * Ensure that the number we got makes sense; limit it within |
2747 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
1da177e4 | 2748 | */ |
54bb2074 BP |
2749 | tape->best_dsc_rw_freq = max_t(unsigned long, |
2750 | min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), | |
2751 | IDETAPE_DSC_RW_MIN); | |
1da177e4 | 2752 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
83042b24 | 2753 | "%lums tDSC%s\n", |
b6422013 | 2754 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
f73850a3 BP |
2755 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
2756 | tape->buffer_size / 1024, | |
54bb2074 | 2757 | tape->best_dsc_rw_freq * 1000 / HZ, |
1da177e4 LT |
2758 | drive->using_dma ? ", DMA":""); |
2759 | ||
2760 | idetape_add_settings(drive); | |
2761 | } | |
2762 | ||
4031bbe4 | 2763 | static void ide_tape_remove(ide_drive_t *drive) |
1da177e4 LT |
2764 | { |
2765 | idetape_tape_t *tape = drive->driver_data; | |
1da177e4 | 2766 | |
7662d046 | 2767 | ide_proc_unregister_driver(drive, tape->driver); |
1da177e4 LT |
2768 | |
2769 | ide_unregister_region(tape->disk); | |
2770 | ||
2771 | ide_tape_put(tape); | |
1da177e4 LT |
2772 | } |
2773 | ||
2774 | static void ide_tape_release(struct kref *kref) | |
2775 | { | |
2776 | struct ide_tape_obj *tape = to_ide_tape(kref); | |
2777 | ide_drive_t *drive = tape->drive; | |
2778 | struct gendisk *g = tape->disk; | |
2779 | ||
01a63aeb | 2780 | BUG_ON(tape->merge_bh_size); |
8604affd | 2781 | |
1da177e4 LT |
2782 | drive->dsc_overlap = 0; |
2783 | drive->driver_data = NULL; | |
dbc1272e | 2784 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
5a04cfa9 BP |
2785 | device_destroy(idetape_sysfs_class, |
2786 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
1da177e4 LT |
2787 | idetape_devs[tape->minor] = NULL; |
2788 | g->private_data = NULL; | |
2789 | put_disk(g); | |
2790 | kfree(tape); | |
2791 | } | |
2792 | ||
ecfd80e4 | 2793 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 LT |
2794 | static int proc_idetape_read_name |
2795 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2796 | { | |
2797 | ide_drive_t *drive = (ide_drive_t *) data; | |
2798 | idetape_tape_t *tape = drive->driver_data; | |
2799 | char *out = page; | |
2800 | int len; | |
2801 | ||
2802 | len = sprintf(out, "%s\n", tape->name); | |
2803 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2804 | } | |
2805 | ||
2806 | static ide_proc_entry_t idetape_proc[] = { | |
2807 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2808 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2809 | { NULL, 0, NULL, NULL } | |
2810 | }; | |
1da177e4 LT |
2811 | #endif |
2812 | ||
4031bbe4 | 2813 | static int ide_tape_probe(ide_drive_t *); |
1da177e4 | 2814 | |
1da177e4 | 2815 | static ide_driver_t idetape_driver = { |
8604affd | 2816 | .gen_driver = { |
4ef3b8f4 | 2817 | .owner = THIS_MODULE, |
8604affd BZ |
2818 | .name = "ide-tape", |
2819 | .bus = &ide_bus_type, | |
8604affd | 2820 | }, |
4031bbe4 RK |
2821 | .probe = ide_tape_probe, |
2822 | .remove = ide_tape_remove, | |
1da177e4 LT |
2823 | .version = IDETAPE_VERSION, |
2824 | .media = ide_tape, | |
1da177e4 | 2825 | .supports_dsc_overlap = 1, |
1da177e4 LT |
2826 | .do_request = idetape_do_request, |
2827 | .end_request = idetape_end_request, | |
2828 | .error = __ide_error, | |
2829 | .abort = __ide_abort, | |
7662d046 | 2830 | #ifdef CONFIG_IDE_PROC_FS |
1da177e4 | 2831 | .proc = idetape_proc, |
7662d046 | 2832 | #endif |
1da177e4 LT |
2833 | }; |
2834 | ||
3c98bf34 | 2835 | /* Our character device supporting functions, passed to register_chrdev. */ |
2b8693c0 | 2836 | static const struct file_operations idetape_fops = { |
1da177e4 LT |
2837 | .owner = THIS_MODULE, |
2838 | .read = idetape_chrdev_read, | |
2839 | .write = idetape_chrdev_write, | |
2840 | .ioctl = idetape_chrdev_ioctl, | |
2841 | .open = idetape_chrdev_open, | |
2842 | .release = idetape_chrdev_release, | |
2843 | }; | |
2844 | ||
2845 | static int idetape_open(struct inode *inode, struct file *filp) | |
2846 | { | |
2847 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2848 | struct ide_tape_obj *tape; | |
1da177e4 | 2849 | |
5a04cfa9 BP |
2850 | tape = ide_tape_get(disk); |
2851 | if (!tape) | |
1da177e4 LT |
2852 | return -ENXIO; |
2853 | ||
1da177e4 LT |
2854 | return 0; |
2855 | } | |
2856 | ||
2857 | static int idetape_release(struct inode *inode, struct file *filp) | |
2858 | { | |
2859 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
2860 | struct ide_tape_obj *tape = ide_tape_g(disk); | |
1da177e4 LT |
2861 | |
2862 | ide_tape_put(tape); | |
2863 | ||
2864 | return 0; | |
2865 | } | |
2866 | ||
2867 | static int idetape_ioctl(struct inode *inode, struct file *file, | |
2868 | unsigned int cmd, unsigned long arg) | |
2869 | { | |
2870 | struct block_device *bdev = inode->i_bdev; | |
2871 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); | |
2872 | ide_drive_t *drive = tape->drive; | |
2873 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); | |
2874 | if (err == -EINVAL) | |
2875 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2876 | return err; | |
2877 | } | |
2878 | ||
2879 | static struct block_device_operations idetape_block_ops = { | |
2880 | .owner = THIS_MODULE, | |
2881 | .open = idetape_open, | |
2882 | .release = idetape_release, | |
2883 | .ioctl = idetape_ioctl, | |
2884 | }; | |
2885 | ||
4031bbe4 | 2886 | static int ide_tape_probe(ide_drive_t *drive) |
1da177e4 LT |
2887 | { |
2888 | idetape_tape_t *tape; | |
2889 | struct gendisk *g; | |
2890 | int minor; | |
2891 | ||
2892 | if (!strstr("ide-tape", drive->driver_req)) | |
2893 | goto failed; | |
2894 | if (!drive->present) | |
2895 | goto failed; | |
2896 | if (drive->media != ide_tape) | |
2897 | goto failed; | |
5a04cfa9 BP |
2898 | if (!idetape_identify_device(drive)) { |
2899 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" | |
2900 | " the driver\n", drive->name); | |
1da177e4 LT |
2901 | goto failed; |
2902 | } | |
2903 | if (drive->scsi) { | |
5a04cfa9 BP |
2904 | printk(KERN_INFO "ide-tape: passing drive %s to ide-scsi" |
2905 | " emulation.\n", drive->name); | |
1da177e4 LT |
2906 | goto failed; |
2907 | } | |
5a04cfa9 | 2908 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1da177e4 | 2909 | if (tape == NULL) { |
5a04cfa9 BP |
2910 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
2911 | drive->name); | |
1da177e4 LT |
2912 | goto failed; |
2913 | } | |
2914 | ||
2915 | g = alloc_disk(1 << PARTN_BITS); | |
2916 | if (!g) | |
2917 | goto out_free_tape; | |
2918 | ||
2919 | ide_init_disk(g, drive); | |
2920 | ||
7662d046 | 2921 | ide_proc_register_driver(drive, &idetape_driver); |
1da177e4 | 2922 | |
1da177e4 LT |
2923 | kref_init(&tape->kref); |
2924 | ||
2925 | tape->drive = drive; | |
2926 | tape->driver = &idetape_driver; | |
2927 | tape->disk = g; | |
2928 | ||
2929 | g->private_data = &tape->driver; | |
2930 | ||
2931 | drive->driver_data = tape; | |
2932 | ||
cf8b8975 | 2933 | mutex_lock(&idetape_ref_mutex); |
1da177e4 LT |
2934 | for (minor = 0; idetape_devs[minor]; minor++) |
2935 | ; | |
2936 | idetape_devs[minor] = tape; | |
cf8b8975 | 2937 | mutex_unlock(&idetape_ref_mutex); |
1da177e4 LT |
2938 | |
2939 | idetape_setup(drive, tape, minor); | |
2940 | ||
dbc1272e TJ |
2941 | device_create(idetape_sysfs_class, &drive->gendev, |
2942 | MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); | |
2943 | device_create(idetape_sysfs_class, &drive->gendev, | |
2944 | MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); | |
d5dee80a | 2945 | |
1da177e4 LT |
2946 | g->fops = &idetape_block_ops; |
2947 | ide_register_region(g); | |
2948 | ||
2949 | return 0; | |
8604affd | 2950 | |
1da177e4 LT |
2951 | out_free_tape: |
2952 | kfree(tape); | |
2953 | failed: | |
8604affd | 2954 | return -ENODEV; |
1da177e4 LT |
2955 | } |
2956 | ||
5a04cfa9 | 2957 | static void __exit idetape_exit(void) |
1da177e4 | 2958 | { |
8604affd | 2959 | driver_unregister(&idetape_driver.gen_driver); |
d5dee80a | 2960 | class_destroy(idetape_sysfs_class); |
1da177e4 LT |
2961 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2962 | } | |
2963 | ||
17514e8a | 2964 | static int __init idetape_init(void) |
1da177e4 | 2965 | { |
d5dee80a WD |
2966 | int error = 1; |
2967 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2968 | if (IS_ERR(idetape_sysfs_class)) { | |
2969 | idetape_sysfs_class = NULL; | |
2970 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2971 | error = -EBUSY; | |
2972 | goto out; | |
2973 | } | |
2974 | ||
1da177e4 | 2975 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
5a04cfa9 BP |
2976 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2977 | " interface\n"); | |
d5dee80a WD |
2978 | error = -EBUSY; |
2979 | goto out_free_class; | |
1da177e4 | 2980 | } |
d5dee80a WD |
2981 | |
2982 | error = driver_register(&idetape_driver.gen_driver); | |
2983 | if (error) | |
2984 | goto out_free_driver; | |
2985 | ||
2986 | return 0; | |
2987 | ||
2988 | out_free_driver: | |
2989 | driver_unregister(&idetape_driver.gen_driver); | |
2990 | out_free_class: | |
2991 | class_destroy(idetape_sysfs_class); | |
2992 | out: | |
2993 | return error; | |
1da177e4 LT |
2994 | } |
2995 | ||
263756ec | 2996 | MODULE_ALIAS("ide:*m-tape*"); |
1da177e4 LT |
2997 | module_init(idetape_init); |
2998 | module_exit(idetape_exit); | |
2999 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
9c145768 BP |
3000 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
3001 | MODULE_LICENSE("GPL"); |