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sched: fix sign check error in place_entity()
[linux-2.6/kvm.git] / drivers / ide / ide-disk.c
blob4754769eda9781ee2531b46f8bcbf42167e41685
1 /*
2 * linux/drivers/ide/ide-disk.c Version 1.18 Mar 05, 2003
3 *
4 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
5 * Copyright (C) 1998-2002 Linux ATA Development
6 * Andre Hedrick <andre@linux-ide.org>
7 * Copyright (C) 2003 Red Hat <alan@redhat.com>
8 */
9
10 /*
11 * Mostly written by Mark Lord <mlord@pobox.com>
12 * and Gadi Oxman <gadio@netvision.net.il>
13 * and Andre Hedrick <andre@linux-ide.org>
14 *
15 * This is the IDE/ATA disk driver, as evolved from hd.c and ide.c.
16 *
17 * Version 1.00 move disk only code from ide.c to ide-disk.c
18 * support optional byte-swapping of all data
19 * Version 1.01 fix previous byte-swapping code
20 * Version 1.02 remove ", LBA" from drive identification msgs
21 * Version 1.03 fix display of id->buf_size for big-endian
22 * Version 1.04 add /proc configurable settings and S.M.A.R.T support
23 * Version 1.05 add capacity support for ATA3 >= 8GB
24 * Version 1.06 get boot-up messages to show full cyl count
25 * Version 1.07 disable door-locking if it fails
26 * Version 1.08 fixed CHS/LBA translations for ATA4 > 8GB,
27 * process of adding new ATA4 compliance.
28 * fixed problems in allowing fdisk to see
29 * the entire disk.
30 * Version 1.09 added increment of rq->sector in ide_multwrite
31 * added UDMA 3/4 reporting
32 * Version 1.10 request queue changes, Ultra DMA 100
33 * Version 1.11 added 48-bit lba
34 * Version 1.12 adding taskfile io access method
35 * Version 1.13 added standby and flush-cache for notifier
36 * Version 1.14 added acoustic-wcache
37 * Version 1.15 convert all calls to ide_raw_taskfile
38 * since args will return register content.
39 * Version 1.16 added suspend-resume-checkpower
40 * Version 1.17 do flush on standby, do flush on ATA < ATA6
41 * fix wcache setup.
42 */
43
44 #define IDEDISK_VERSION "1.18"
45
46 //#define DEBUG
47
48 #include <linux/module.h>
49 #include <linux/types.h>
50 #include <linux/string.h>
51 #include <linux/kernel.h>
52 #include <linux/timer.h>
53 #include <linux/mm.h>
54 #include <linux/interrupt.h>
55 #include <linux/major.h>
56 #include <linux/errno.h>
57 #include <linux/genhd.h>
58 #include <linux/slab.h>
59 #include <linux/delay.h>
60 #include <linux/mutex.h>
61 #include <linux/leds.h>
62
63 #define _IDE_DISK
64
65 #include <linux/ide.h>
66
67 #include <asm/byteorder.h>
68 #include <asm/irq.h>
69 #include <asm/uaccess.h>
70 #include <asm/io.h>
71 #include <asm/div64.h>
72
73 struct ide_disk_obj {
74 ide_drive_t *drive;
75 ide_driver_t *driver;
76 struct gendisk *disk;
77 struct kref kref;
78 unsigned int openers; /* protected by BKL for now */
79 };
80
81 static DEFINE_MUTEX(idedisk_ref_mutex);
82
83 #define to_ide_disk(obj) container_of(obj, struct ide_disk_obj, kref)
84
85 #define ide_disk_g(disk) \
86 container_of((disk)->private_data, struct ide_disk_obj, driver)
87
88 static struct ide_disk_obj *ide_disk_get(struct gendisk *disk)
89 {
90 struct ide_disk_obj *idkp = NULL;
91
92 mutex_lock(&idedisk_ref_mutex);
93 idkp = ide_disk_g(disk);
94 if (idkp)
95 kref_get(&idkp->kref);
96 mutex_unlock(&idedisk_ref_mutex);
97 return idkp;
98 }
99
100 static void ide_disk_release(struct kref *);
101
102 static void ide_disk_put(struct ide_disk_obj *idkp)
103 {
104 mutex_lock(&idedisk_ref_mutex);
105 kref_put(&idkp->kref, ide_disk_release);
106 mutex_unlock(&idedisk_ref_mutex);
107 }
108
109 /*
110 * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
111 * value for this drive (from its reported identification information).
112 *
113 * Returns: 1 if lba_capacity looks sensible
114 * 0 otherwise
115 *
116 * It is called only once for each drive.
117 */
118 static int lba_capacity_is_ok (struct hd_driveid *id)
119 {
120 unsigned long lba_sects, chs_sects, head, tail;
121
122 /* No non-LBA info .. so valid! */
123 if (id->cyls == 0)
124 return 1;
125
126 /*
127 * The ATA spec tells large drives to return
128 * C/H/S = 16383/16/63 independent of their size.
129 * Some drives can be jumpered to use 15 heads instead of 16.
130 * Some drives can be jumpered to use 4092 cyls instead of 16383.
131 */
132 if ((id->cyls == 16383
133 || (id->cyls == 4092 && id->cur_cyls == 16383)) &&
134 id->sectors == 63 &&
135 (id->heads == 15 || id->heads == 16) &&
136 (id->lba_capacity >= 16383*63*id->heads))
137 return 1;
138
139 lba_sects = id->lba_capacity;
140 chs_sects = id->cyls * id->heads * id->sectors;
141
142 /* perform a rough sanity check on lba_sects: within 10% is OK */
143 if ((lba_sects - chs_sects) < chs_sects/10)
144 return 1;
145
146 /* some drives have the word order reversed */
147 head = ((lba_sects >> 16) & 0xffff);
148 tail = (lba_sects & 0xffff);
149 lba_sects = (head | (tail << 16));
150 if ((lba_sects - chs_sects) < chs_sects/10) {
151 id->lba_capacity = lba_sects;
152 return 1; /* lba_capacity is (now) good */
153 }
154
155 return 0; /* lba_capacity value may be bad */
156 }
157
158 /*
159 * __ide_do_rw_disk() issues READ and WRITE commands to a disk,
160 * using LBA if supported, or CHS otherwise, to address sectors.
161 */
162 static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq, sector_t block)
163 {
164 ide_hwif_t *hwif = HWIF(drive);
165 unsigned int dma = drive->using_dma;
166 u8 lba48 = (drive->addressing == 1) ? 1 : 0;
167 task_ioreg_t command = WIN_NOP;
168 ata_nsector_t nsectors;
169
170 nsectors.all = (u16) rq->nr_sectors;
171
172 if (hwif->no_lba48_dma && lba48 && dma) {
173 if (block + rq->nr_sectors > 1ULL << 28)
174 dma = 0;
175 else
176 lba48 = 0;
177 }
178
179 if (!dma) {
180 ide_init_sg_cmd(drive, rq);
181 ide_map_sg(drive, rq);
182 }
183
184 if (IDE_CONTROL_REG)
185 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
186
187 /* FIXME: SELECT_MASK(drive, 0) ? */
188
189 if (drive->select.b.lba) {
190 if (lba48) {
191 task_ioreg_t tasklets[10];
192
193 pr_debug("%s: LBA=0x%012llx\n", drive->name,
194 (unsigned long long)block);
195
196 tasklets[0] = 0;
197 tasklets[1] = 0;
198 tasklets[2] = nsectors.b.low;
199 tasklets[3] = nsectors.b.high;
200 tasklets[4] = (task_ioreg_t) block;
201 tasklets[5] = (task_ioreg_t) (block>>8);
202 tasklets[6] = (task_ioreg_t) (block>>16);
203 tasklets[7] = (task_ioreg_t) (block>>24);
204 if (sizeof(block) == 4) {
205 tasklets[8] = (task_ioreg_t) 0;
206 tasklets[9] = (task_ioreg_t) 0;
207 } else {
208 tasklets[8] = (task_ioreg_t)((u64)block >> 32);
209 tasklets[9] = (task_ioreg_t)((u64)block >> 40);
210 }
211 #ifdef DEBUG
212 printk("%s: 0x%02x%02x 0x%02x%02x%02x%02x%02x%02x\n",
213 drive->name, tasklets[3], tasklets[2],
214 tasklets[9], tasklets[8], tasklets[7],
215 tasklets[6], tasklets[5], tasklets[4]);
216 #endif
217 hwif->OUTB(tasklets[1], IDE_FEATURE_REG);
218 hwif->OUTB(tasklets[3], IDE_NSECTOR_REG);
219 hwif->OUTB(tasklets[7], IDE_SECTOR_REG);
220 hwif->OUTB(tasklets[8], IDE_LCYL_REG);
221 hwif->OUTB(tasklets[9], IDE_HCYL_REG);
222
223 hwif->OUTB(tasklets[0], IDE_FEATURE_REG);
224 hwif->OUTB(tasklets[2], IDE_NSECTOR_REG);
225 hwif->OUTB(tasklets[4], IDE_SECTOR_REG);
226 hwif->OUTB(tasklets[5], IDE_LCYL_REG);
227 hwif->OUTB(tasklets[6], IDE_HCYL_REG);
228 hwif->OUTB(0x00|drive->select.all,IDE_SELECT_REG);
229 } else {
230 hwif->OUTB(0x00, IDE_FEATURE_REG);
231 hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
232 hwif->OUTB(block, IDE_SECTOR_REG);
233 hwif->OUTB(block>>=8, IDE_LCYL_REG);
234 hwif->OUTB(block>>=8, IDE_HCYL_REG);
235 hwif->OUTB(((block>>8)&0x0f)|drive->select.all,IDE_SELECT_REG);
236 }
237 } else {
238 unsigned int sect,head,cyl,track;
239 track = (int)block / drive->sect;
240 sect = (int)block % drive->sect + 1;
241 hwif->OUTB(sect, IDE_SECTOR_REG);
242 head = track % drive->head;
243 cyl = track / drive->head;
244
245 pr_debug("%s: CHS=%u/%u/%u\n", drive->name, cyl, head, sect);
246
247 hwif->OUTB(0x00, IDE_FEATURE_REG);
248 hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
249 hwif->OUTB(cyl, IDE_LCYL_REG);
250 hwif->OUTB(cyl>>8, IDE_HCYL_REG);
251 hwif->OUTB(head|drive->select.all,IDE_SELECT_REG);
252 }
253
254 if (dma) {
255 if (!hwif->dma_setup(drive)) {
256 if (rq_data_dir(rq)) {
257 command = lba48 ? WIN_WRITEDMA_EXT : WIN_WRITEDMA;
258 if (drive->vdma)
259 command = lba48 ? WIN_WRITE_EXT: WIN_WRITE;
260 } else {
261 command = lba48 ? WIN_READDMA_EXT : WIN_READDMA;
262 if (drive->vdma)
263 command = lba48 ? WIN_READ_EXT: WIN_READ;
264 }
265 hwif->dma_exec_cmd(drive, command);
266 hwif->dma_start(drive);
267 return ide_started;
268 }
269 /* fallback to PIO */
270 ide_init_sg_cmd(drive, rq);
271 }
272
273 if (rq_data_dir(rq) == READ) {
274
275 if (drive->mult_count) {
276 hwif->data_phase = TASKFILE_MULTI_IN;
277 command = lba48 ? WIN_MULTREAD_EXT : WIN_MULTREAD;
278 } else {
279 hwif->data_phase = TASKFILE_IN;
280 command = lba48 ? WIN_READ_EXT : WIN_READ;
281 }
282
283 ide_execute_command(drive, command, &task_in_intr, WAIT_CMD, NULL);
284 return ide_started;
285 } else {
286 if (drive->mult_count) {
287 hwif->data_phase = TASKFILE_MULTI_OUT;
288 command = lba48 ? WIN_MULTWRITE_EXT : WIN_MULTWRITE;
289 } else {
290 hwif->data_phase = TASKFILE_OUT;
291 command = lba48 ? WIN_WRITE_EXT : WIN_WRITE;
292 }
293
294 /* FIXME: ->OUTBSYNC ? */
295 hwif->OUTB(command, IDE_COMMAND_REG);
296
297 return pre_task_out_intr(drive, rq);
298 }
299 }
300
301 /*
302 * 268435455 == 137439 MB or 28bit limit
303 * 320173056 == 163929 MB or 48bit addressing
304 * 1073741822 == 549756 MB or 48bit addressing fake drive
305 */
306
307 static ide_startstop_t ide_do_rw_disk (ide_drive_t *drive, struct request *rq, sector_t block)
308 {
309 ide_hwif_t *hwif = HWIF(drive);
310
311 BUG_ON(drive->blocked);
312
313 if (!blk_fs_request(rq)) {
314 blk_dump_rq_flags(rq, "ide_do_rw_disk - bad command");
315 ide_end_request(drive, 0, 0);
316 return ide_stopped;
317 }
318
319 ledtrig_ide_activity();
320
321 pr_debug("%s: %sing: block=%llu, sectors=%lu, buffer=0x%08lx\n",
322 drive->name, rq_data_dir(rq) == READ ? "read" : "writ",
323 (unsigned long long)block, rq->nr_sectors,
324 (unsigned long)rq->buffer);
325
326 if (hwif->rw_disk)
327 hwif->rw_disk(drive, rq);
328
329 return __ide_do_rw_disk(drive, rq, block);
330 }
331
332 /*
333 * Queries for true maximum capacity of the drive.
334 * Returns maximum LBA address (> 0) of the drive, 0 if failed.
335 */
336 static unsigned long idedisk_read_native_max_address(ide_drive_t *drive)
337 {
338 ide_task_t args;
339 unsigned long addr = 0;
340
341 /* Create IDE/ATA command request structure */
342 memset(&args, 0, sizeof(ide_task_t));
343 args.tfRegister[IDE_SELECT_OFFSET] = 0x40;
344 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_READ_NATIVE_MAX;
345 args.command_type = IDE_DRIVE_TASK_NO_DATA;
346 args.handler = &task_no_data_intr;
347 /* submit command request */
348 ide_raw_taskfile(drive, &args, NULL);
349
350 /* if OK, compute maximum address value */
351 if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
352 addr = ((args.tfRegister[IDE_SELECT_OFFSET] & 0x0f) << 24)
353 | ((args.tfRegister[ IDE_HCYL_OFFSET] ) << 16)
354 | ((args.tfRegister[ IDE_LCYL_OFFSET] ) << 8)
355 | ((args.tfRegister[IDE_SECTOR_OFFSET] ));
356 addr++; /* since the return value is (maxlba - 1), we add 1 */
357 }
358 return addr;
359 }
360
361 static unsigned long long idedisk_read_native_max_address_ext(ide_drive_t *drive)
362 {
363 ide_task_t args;
364 unsigned long long addr = 0;
365
366 /* Create IDE/ATA command request structure */
367 memset(&args, 0, sizeof(ide_task_t));
368
369 args.tfRegister[IDE_SELECT_OFFSET] = 0x40;
370 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_READ_NATIVE_MAX_EXT;
371 args.command_type = IDE_DRIVE_TASK_NO_DATA;
372 args.handler = &task_no_data_intr;
373 /* submit command request */
374 ide_raw_taskfile(drive, &args, NULL);
375
376 /* if OK, compute maximum address value */
377 if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
378 u32 high = (args.hobRegister[IDE_HCYL_OFFSET] << 16) |
379 (args.hobRegister[IDE_LCYL_OFFSET] << 8) |
380 args.hobRegister[IDE_SECTOR_OFFSET];
381 u32 low = ((args.tfRegister[IDE_HCYL_OFFSET])<<16) |
382 ((args.tfRegister[IDE_LCYL_OFFSET])<<8) |
383 (args.tfRegister[IDE_SECTOR_OFFSET]);
384 addr = ((__u64)high << 24) | low;
385 addr++; /* since the return value is (maxlba - 1), we add 1 */
386 }
387 return addr;
388 }
389
390 /*
391 * Sets maximum virtual LBA address of the drive.
392 * Returns new maximum virtual LBA address (> 0) or 0 on failure.
393 */
394 static unsigned long idedisk_set_max_address(ide_drive_t *drive, unsigned long addr_req)
395 {
396 ide_task_t args;
397 unsigned long addr_set = 0;
398
399 addr_req--;
400 /* Create IDE/ATA command request structure */
401 memset(&args, 0, sizeof(ide_task_t));
402 args.tfRegister[IDE_SECTOR_OFFSET] = ((addr_req >> 0) & 0xff);
403 args.tfRegister[IDE_LCYL_OFFSET] = ((addr_req >> 8) & 0xff);
404 args.tfRegister[IDE_HCYL_OFFSET] = ((addr_req >> 16) & 0xff);
405 args.tfRegister[IDE_SELECT_OFFSET] = ((addr_req >> 24) & 0x0f) | 0x40;
406 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SET_MAX;
407 args.command_type = IDE_DRIVE_TASK_NO_DATA;
408 args.handler = &task_no_data_intr;
409 /* submit command request */
410 ide_raw_taskfile(drive, &args, NULL);
411 /* if OK, read new maximum address value */
412 if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
413 addr_set = ((args.tfRegister[IDE_SELECT_OFFSET] & 0x0f) << 24)
414 | ((args.tfRegister[ IDE_HCYL_OFFSET] ) << 16)
415 | ((args.tfRegister[ IDE_LCYL_OFFSET] ) << 8)
416 | ((args.tfRegister[IDE_SECTOR_OFFSET] ));
417 addr_set++;
418 }
419 return addr_set;
420 }
421
422 static unsigned long long idedisk_set_max_address_ext(ide_drive_t *drive, unsigned long long addr_req)
423 {
424 ide_task_t args;
425 unsigned long long addr_set = 0;
426
427 addr_req--;
428 /* Create IDE/ATA command request structure */
429 memset(&args, 0, sizeof(ide_task_t));
430 args.tfRegister[IDE_SECTOR_OFFSET] = ((addr_req >> 0) & 0xff);
431 args.tfRegister[IDE_LCYL_OFFSET] = ((addr_req >>= 8) & 0xff);
432 args.tfRegister[IDE_HCYL_OFFSET] = ((addr_req >>= 8) & 0xff);
433 args.tfRegister[IDE_SELECT_OFFSET] = 0x40;
434 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SET_MAX_EXT;
435 args.hobRegister[IDE_SECTOR_OFFSET] = (addr_req >>= 8) & 0xff;
436 args.hobRegister[IDE_LCYL_OFFSET] = (addr_req >>= 8) & 0xff;
437 args.hobRegister[IDE_HCYL_OFFSET] = (addr_req >>= 8) & 0xff;
438 args.hobRegister[IDE_SELECT_OFFSET] = 0x40;
439 args.hobRegister[IDE_CONTROL_OFFSET_HOB]= (drive->ctl|0x80);
440 args.command_type = IDE_DRIVE_TASK_NO_DATA;
441 args.handler = &task_no_data_intr;
442 /* submit command request */
443 ide_raw_taskfile(drive, &args, NULL);
444 /* if OK, compute maximum address value */
445 if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
446 u32 high = (args.hobRegister[IDE_HCYL_OFFSET] << 16) |
447 (args.hobRegister[IDE_LCYL_OFFSET] << 8) |
448 args.hobRegister[IDE_SECTOR_OFFSET];
449 u32 low = ((args.tfRegister[IDE_HCYL_OFFSET])<<16) |
450 ((args.tfRegister[IDE_LCYL_OFFSET])<<8) |
451 (args.tfRegister[IDE_SECTOR_OFFSET]);
452 addr_set = ((__u64)high << 24) | low;
453 addr_set++;
454 }
455 return addr_set;
456 }
457
458 static unsigned long long sectors_to_MB(unsigned long long n)
459 {
460 n <<= 9; /* make it bytes */
461 do_div(n, 1000000); /* make it MB */
462 return n;
463 }
464
465 /*
466 * Bits 10 of command_set_1 and cfs_enable_1 must be equal,
467 * so on non-buggy drives we need test only one.
468 * However, we should also check whether these fields are valid.
469 */
470 static inline int idedisk_supports_hpa(const struct hd_driveid *id)
471 {
472 return (id->command_set_1 & 0x0400) && (id->cfs_enable_1 & 0x0400);
473 }
474
475 /*
476 * The same here.
477 */
478 static inline int idedisk_supports_lba48(const struct hd_driveid *id)
479 {
480 return (id->command_set_2 & 0x0400) && (id->cfs_enable_2 & 0x0400)
481 && id->lba_capacity_2;
482 }
483
484 /*
485 * Some disks report total number of sectors instead of
486 * maximum sector address. We list them here.
487 */
488 static const struct drive_list_entry hpa_list[] = {
489 { "ST340823A", NULL },
490 { "ST320413A", NULL },
491 { NULL, NULL }
492 };
493
494 static void idedisk_check_hpa(ide_drive_t *drive)
495 {
496 unsigned long long capacity, set_max;
497 int lba48 = idedisk_supports_lba48(drive->id);
498
499 capacity = drive->capacity64;
500 if (lba48)
501 set_max = idedisk_read_native_max_address_ext(drive);
502 else
503 set_max = idedisk_read_native_max_address(drive);
504
505 if (ide_in_drive_list(drive->id, hpa_list)) {
506 /*
507 * Since we are inclusive wrt to firmware revisions do this
508 * extra check and apply the workaround only when needed.
509 */
510 if (set_max == capacity + 1)
511 set_max--;
512 }
513
514 if (set_max <= capacity)
515 return;
516
517 printk(KERN_INFO "%s: Host Protected Area detected.\n"
518 "\tcurrent capacity is %llu sectors (%llu MB)\n"
519 "\tnative capacity is %llu sectors (%llu MB)\n",
520 drive->name,
521 capacity, sectors_to_MB(capacity),
522 set_max, sectors_to_MB(set_max));
523
524 if (lba48)
525 set_max = idedisk_set_max_address_ext(drive, set_max);
526 else
527 set_max = idedisk_set_max_address(drive, set_max);
528 if (set_max) {
529 drive->capacity64 = set_max;
530 printk(KERN_INFO "%s: Host Protected Area disabled.\n",
531 drive->name);
532 }
533 }
534
535 /*
536 * Compute drive->capacity, the full capacity of the drive
537 * Called with drive->id != NULL.
538 *
539 * To compute capacity, this uses either of
540 *
541 * 1. CHS value set by user (whatever user sets will be trusted)
542 * 2. LBA value from target drive (require new ATA feature)
543 * 3. LBA value from system BIOS (new one is OK, old one may break)
544 * 4. CHS value from system BIOS (traditional style)
545 *
546 * in above order (i.e., if value of higher priority is available,
547 * reset will be ignored).
548 */
549 static void init_idedisk_capacity (ide_drive_t *drive)
550 {
551 struct hd_driveid *id = drive->id;
552 /*
553 * If this drive supports the Host Protected Area feature set,
554 * then we may need to change our opinion about the drive's capacity.
555 */
556 int hpa = idedisk_supports_hpa(id);
557
558 if (idedisk_supports_lba48(id)) {
559 /* drive speaks 48-bit LBA */
560 drive->select.b.lba = 1;
561 drive->capacity64 = id->lba_capacity_2;
562 if (hpa)
563 idedisk_check_hpa(drive);
564 } else if ((id->capability & 2) && lba_capacity_is_ok(id)) {
565 /* drive speaks 28-bit LBA */
566 drive->select.b.lba = 1;
567 drive->capacity64 = id->lba_capacity;
568 if (hpa)
569 idedisk_check_hpa(drive);
570 } else {
571 /* drive speaks boring old 28-bit CHS */
572 drive->capacity64 = drive->cyl * drive->head * drive->sect;
573 }
574 }
575
576 static sector_t idedisk_capacity (ide_drive_t *drive)
577 {
578 return drive->capacity64 - drive->sect0;
579 }
580
581 #ifdef CONFIG_IDE_PROC_FS
582 static int smart_enable(ide_drive_t *drive)
583 {
584 ide_task_t args;
585
586 memset(&args, 0, sizeof(ide_task_t));
587 args.tfRegister[IDE_FEATURE_OFFSET] = SMART_ENABLE;
588 args.tfRegister[IDE_LCYL_OFFSET] = SMART_LCYL_PASS;
589 args.tfRegister[IDE_HCYL_OFFSET] = SMART_HCYL_PASS;
590 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SMART;
591 args.command_type = IDE_DRIVE_TASK_NO_DATA;
592 args.handler = &task_no_data_intr;
593 return ide_raw_taskfile(drive, &args, NULL);
594 }
595
596 static int get_smart_values(ide_drive_t *drive, u8 *buf)
597 {
598 ide_task_t args;
599
600 memset(&args, 0, sizeof(ide_task_t));
601 args.tfRegister[IDE_FEATURE_OFFSET] = SMART_READ_VALUES;
602 args.tfRegister[IDE_NSECTOR_OFFSET] = 0x01;
603 args.tfRegister[IDE_LCYL_OFFSET] = SMART_LCYL_PASS;
604 args.tfRegister[IDE_HCYL_OFFSET] = SMART_HCYL_PASS;
605 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SMART;
606 args.command_type = IDE_DRIVE_TASK_IN;
607 args.data_phase = TASKFILE_IN;
608 args.handler = &task_in_intr;
609 (void) smart_enable(drive);
610 return ide_raw_taskfile(drive, &args, buf);
611 }
612
613 static int get_smart_thresholds(ide_drive_t *drive, u8 *buf)
614 {
615 ide_task_t args;
616 memset(&args, 0, sizeof(ide_task_t));
617 args.tfRegister[IDE_FEATURE_OFFSET] = SMART_READ_THRESHOLDS;
618 args.tfRegister[IDE_NSECTOR_OFFSET] = 0x01;
619 args.tfRegister[IDE_LCYL_OFFSET] = SMART_LCYL_PASS;
620 args.tfRegister[IDE_HCYL_OFFSET] = SMART_HCYL_PASS;
621 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SMART;
622 args.command_type = IDE_DRIVE_TASK_IN;
623 args.data_phase = TASKFILE_IN;
624 args.handler = &task_in_intr;
625 (void) smart_enable(drive);
626 return ide_raw_taskfile(drive, &args, buf);
627 }
628
629 static int proc_idedisk_read_cache
630 (char *page, char **start, off_t off, int count, int *eof, void *data)
631 {
632 ide_drive_t *drive = (ide_drive_t *) data;
633 char *out = page;
634 int len;
635
636 if (drive->id_read)
637 len = sprintf(out,"%i\n", drive->id->buf_size / 2);
638 else
639 len = sprintf(out,"(none)\n");
640 PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
641 }
642
643 static int proc_idedisk_read_capacity
644 (char *page, char **start, off_t off, int count, int *eof, void *data)
645 {
646 ide_drive_t*drive = (ide_drive_t *)data;
647 int len;
648
649 len = sprintf(page,"%llu\n", (long long)idedisk_capacity(drive));
650 PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
651 }
652
653 static int proc_idedisk_read_smart_thresholds
654 (char *page, char **start, off_t off, int count, int *eof, void *data)
655 {
656 ide_drive_t *drive = (ide_drive_t *)data;
657 int len = 0, i = 0;
658
659 if (!get_smart_thresholds(drive, page)) {
660 unsigned short *val = (unsigned short *) page;
661 char *out = ((char *)val) + (SECTOR_WORDS * 4);
662 page = out;
663 do {
664 out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
665 val += 1;
666 } while (i < (SECTOR_WORDS * 2));
667 len = out - page;
668 }
669 PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
670 }
671
672 static int proc_idedisk_read_smart_values
673 (char *page, char **start, off_t off, int count, int *eof, void *data)
674 {
675 ide_drive_t *drive = (ide_drive_t *)data;
676 int len = 0, i = 0;
677
678 if (!get_smart_values(drive, page)) {
679 unsigned short *val = (unsigned short *) page;
680 char *out = ((char *)val) + (SECTOR_WORDS * 4);
681 page = out;
682 do {
683 out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
684 val += 1;
685 } while (i < (SECTOR_WORDS * 2));
686 len = out - page;
687 }
688 PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
689 }
690
691 static ide_proc_entry_t idedisk_proc[] = {
692 { "cache", S_IFREG|S_IRUGO, proc_idedisk_read_cache, NULL },
693 { "capacity", S_IFREG|S_IRUGO, proc_idedisk_read_capacity, NULL },
694 { "geometry", S_IFREG|S_IRUGO, proc_ide_read_geometry, NULL },
695 { "smart_values", S_IFREG|S_IRUSR, proc_idedisk_read_smart_values, NULL },
696 { "smart_thresholds", S_IFREG|S_IRUSR, proc_idedisk_read_smart_thresholds, NULL },
697 { NULL, 0, NULL, NULL }
698 };
699 #endif /* CONFIG_IDE_PROC_FS */
700
701 static void idedisk_prepare_flush(struct request_queue *q, struct request *rq)
702 {
703 ide_drive_t *drive = q->queuedata;
704
705 memset(rq->cmd, 0, sizeof(rq->cmd));
706
707 if (ide_id_has_flush_cache_ext(drive->id) &&
708 (drive->capacity64 >= (1UL << 28)))
709 rq->cmd[0] = WIN_FLUSH_CACHE_EXT;
710 else
711 rq->cmd[0] = WIN_FLUSH_CACHE;
712
713
714 rq->cmd_type = REQ_TYPE_ATA_TASK;
715 rq->cmd_flags |= REQ_SOFTBARRIER;
716 rq->buffer = rq->cmd;
717 }
718
719 static int idedisk_issue_flush(struct request_queue *q, struct gendisk *disk,
720 sector_t *error_sector)
721 {
722 ide_drive_t *drive = q->queuedata;
723 struct request *rq;
724 int ret;
725
726 if (!drive->wcache)
727 return 0;
728
729 rq = blk_get_request(q, WRITE, __GFP_WAIT);
730
731 idedisk_prepare_flush(q, rq);
732
733 ret = blk_execute_rq(q, disk, rq, 0);
734
735 /*
736 * if we failed and caller wants error offset, get it
737 */
738 if (ret && error_sector)
739 *error_sector = ide_get_error_location(drive, rq->cmd);
740
741 blk_put_request(rq);
742 return ret;
743 }
744
745 /*
746 * This is tightly woven into the driver->do_special can not touch.
747 * DON'T do it again until a total personality rewrite is committed.
748 */
749 static int set_multcount(ide_drive_t *drive, int arg)
750 {
751 struct request rq;
752
753 if (arg < 0 || arg > drive->id->max_multsect)
754 return -EINVAL;
755
756 if (drive->special.b.set_multmode)
757 return -EBUSY;
758 ide_init_drive_cmd (&rq);
759 rq.cmd_type = REQ_TYPE_ATA_CMD;
760 drive->mult_req = arg;
761 drive->special.b.set_multmode = 1;
762 (void) ide_do_drive_cmd (drive, &rq, ide_wait);
763 return (drive->mult_count == arg) ? 0 : -EIO;
764 }
765
766 static int set_nowerr(ide_drive_t *drive, int arg)
767 {
768 if (arg < 0 || arg > 1)
769 return -EINVAL;
770
771 if (ide_spin_wait_hwgroup(drive))
772 return -EBUSY;
773 drive->nowerr = arg;
774 drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
775 spin_unlock_irq(&ide_lock);
776 return 0;
777 }
778
779 static void update_ordered(ide_drive_t *drive)
780 {
781 struct hd_driveid *id = drive->id;
782 unsigned ordered = QUEUE_ORDERED_NONE;
783 prepare_flush_fn *prep_fn = NULL;
784 issue_flush_fn *issue_fn = NULL;
785
786 if (drive->wcache) {
787 unsigned long long capacity;
788 int barrier;
789 /*
790 * We must avoid issuing commands a drive does not
791 * understand or we may crash it. We check flush cache
792 * is supported. We also check we have the LBA48 flush
793 * cache if the drive capacity is too large. By this
794 * time we have trimmed the drive capacity if LBA48 is
795 * not available so we don't need to recheck that.
796 */
797 capacity = idedisk_capacity(drive);
798 barrier = ide_id_has_flush_cache(id) && !drive->noflush &&
799 (drive->addressing == 0 || capacity <= (1ULL << 28) ||
800 ide_id_has_flush_cache_ext(id));
801
802 printk(KERN_INFO "%s: cache flushes %ssupported\n",
803 drive->name, barrier ? "" : "not ");
804
805 if (barrier) {
806 ordered = QUEUE_ORDERED_DRAIN_FLUSH;
807 prep_fn = idedisk_prepare_flush;
808 issue_fn = idedisk_issue_flush;
809 }
810 } else
811 ordered = QUEUE_ORDERED_DRAIN;
812
813 blk_queue_ordered(drive->queue, ordered, prep_fn);
814 blk_queue_issue_flush_fn(drive->queue, issue_fn);
815 }
816
817 static int write_cache(ide_drive_t *drive, int arg)
818 {
819 ide_task_t args;
820 int err = 1;
821
822 if (arg < 0 || arg > 1)
823 return -EINVAL;
824
825 if (ide_id_has_flush_cache(drive->id)) {
826 memset(&args, 0, sizeof(ide_task_t));
827 args.tfRegister[IDE_FEATURE_OFFSET] = (arg) ?
828 SETFEATURES_EN_WCACHE : SETFEATURES_DIS_WCACHE;
829 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SETFEATURES;
830 args.command_type = IDE_DRIVE_TASK_NO_DATA;
831 args.handler = &task_no_data_intr;
832 err = ide_raw_taskfile(drive, &args, NULL);
833 if (err == 0)
834 drive->wcache = arg;
835 }
836
837 update_ordered(drive);
838
839 return err;
840 }
841
842 static int do_idedisk_flushcache (ide_drive_t *drive)
843 {
844 ide_task_t args;
845
846 memset(&args, 0, sizeof(ide_task_t));
847 if (ide_id_has_flush_cache_ext(drive->id))
848 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE_EXT;
849 else
850 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE;
851 args.command_type = IDE_DRIVE_TASK_NO_DATA;
852 args.handler = &task_no_data_intr;
853 return ide_raw_taskfile(drive, &args, NULL);
854 }
855
856 static int set_acoustic (ide_drive_t *drive, int arg)
857 {
858 ide_task_t args;
859
860 if (arg < 0 || arg > 254)
861 return -EINVAL;
862
863 memset(&args, 0, sizeof(ide_task_t));
864 args.tfRegister[IDE_FEATURE_OFFSET] = (arg) ? SETFEATURES_EN_AAM :
865 SETFEATURES_DIS_AAM;
866 args.tfRegister[IDE_NSECTOR_OFFSET] = arg;
867 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_SETFEATURES;
868 args.command_type = IDE_DRIVE_TASK_NO_DATA;
869 args.handler = &task_no_data_intr;
870 ide_raw_taskfile(drive, &args, NULL);
871 drive->acoustic = arg;
872 return 0;
873 }
874
875 /*
876 * drive->addressing:
877 * 0: 28-bit
878 * 1: 48-bit
879 * 2: 48-bit capable doing 28-bit
880 */
881 static int set_lba_addressing(ide_drive_t *drive, int arg)
882 {
883 if (arg < 0 || arg > 2)
884 return -EINVAL;
885
886 drive->addressing = 0;
887
888 if (HWIF(drive)->no_lba48)
889 return 0;
890
891 if (!idedisk_supports_lba48(drive->id))
892 return -EIO;
893 drive->addressing = arg;
894 return 0;
895 }
896
897 #ifdef CONFIG_IDE_PROC_FS
898 static void idedisk_add_settings(ide_drive_t *drive)
899 {
900 struct hd_driveid *id = drive->id;
901
902 ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 65535, 1, 1, &drive->bios_cyl, NULL);
903 ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
904 ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
905 ide_add_setting(drive, "address", SETTING_RW, TYPE_BYTE, 0, 2, 1, 1, &drive->addressing, set_lba_addressing);
906 ide_add_setting(drive, "bswap", SETTING_READ, TYPE_BYTE, 0, 1, 1, 1, &drive->bswap, NULL);
907 ide_add_setting(drive, "multcount", SETTING_RW, TYPE_BYTE, 0, id->max_multsect, 1, 1, &drive->mult_count, set_multcount);
908 ide_add_setting(drive, "nowerr", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->nowerr, set_nowerr);
909 ide_add_setting(drive, "lun", SETTING_RW, TYPE_INT, 0, 7, 1, 1, &drive->lun, NULL);
910 ide_add_setting(drive, "wcache", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->wcache, write_cache);
911 ide_add_setting(drive, "acoustic", SETTING_RW, TYPE_BYTE, 0, 254, 1, 1, &drive->acoustic, set_acoustic);
912 ide_add_setting(drive, "failures", SETTING_RW, TYPE_INT, 0, 65535, 1, 1, &drive->failures, NULL);
913 ide_add_setting(drive, "max_failures", SETTING_RW, TYPE_INT, 0, 65535, 1, 1, &drive->max_failures, NULL);
914 }
915 #else
916 static inline void idedisk_add_settings(ide_drive_t *drive) { ; }
917 #endif
918
919 static void idedisk_setup (ide_drive_t *drive)
920 {
921 struct hd_driveid *id = drive->id;
922 unsigned long long capacity;
923
924 idedisk_add_settings(drive);
925
926 if (drive->id_read == 0)
927 return;
928
929 if (drive->removable) {
930 /*
931 * Removable disks (eg. SYQUEST); ignore 'WD' drives
932 */
933 if (id->model[0] != 'W' || id->model[1] != 'D') {
934 drive->doorlocking = 1;
935 }
936 }
937
938 (void)set_lba_addressing(drive, 1);
939
940 if (drive->addressing == 1) {
941 ide_hwif_t *hwif = HWIF(drive);
942 int max_s = 2048;
943
944 if (max_s > hwif->rqsize)
945 max_s = hwif->rqsize;
946
947 blk_queue_max_sectors(drive->queue, max_s);
948 }
949
950 printk(KERN_INFO "%s: max request size: %dKiB\n", drive->name, drive->queue->max_sectors / 2);
951
952 /* calculate drive capacity, and select LBA if possible */
953 init_idedisk_capacity (drive);
954
955 /* limit drive capacity to 137GB if LBA48 cannot be used */
956 if (drive->addressing == 0 && drive->capacity64 > 1ULL << 28) {
957 printk(KERN_WARNING "%s: cannot use LBA48 - full capacity "
958 "%llu sectors (%llu MB)\n",
959 drive->name, (unsigned long long)drive->capacity64,
960 sectors_to_MB(drive->capacity64));
961 drive->capacity64 = 1ULL << 28;
962 }
963
964 if (drive->hwif->no_lba48_dma && drive->addressing) {
965 if (drive->capacity64 > 1ULL << 28) {
966 printk(KERN_INFO "%s: cannot use LBA48 DMA - PIO mode will"
967 " be used for accessing sectors > %u\n",
968 drive->name, 1 << 28);
969 } else
970 drive->addressing = 0;
971 }
972
973 /*
974 * if possible, give fdisk access to more of the drive,
975 * by correcting bios_cyls:
976 */
977 capacity = idedisk_capacity (drive);
978 if (!drive->forced_geom) {
979
980 if (idedisk_supports_lba48(drive->id)) {
981 /* compatibility */
982 drive->bios_sect = 63;
983 drive->bios_head = 255;
984 }
985
986 if (drive->bios_sect && drive->bios_head) {
987 unsigned int cap0 = capacity; /* truncate to 32 bits */
988 unsigned int cylsz, cyl;
989
990 if (cap0 != capacity)
991 drive->bios_cyl = 65535;
992 else {
993 cylsz = drive->bios_sect * drive->bios_head;
994 cyl = cap0 / cylsz;
995 if (cyl > 65535)
996 cyl = 65535;
997 if (cyl > drive->bios_cyl)
998 drive->bios_cyl = cyl;
999 }
1000 }
1001 }
1002 printk(KERN_INFO "%s: %llu sectors (%llu MB)",
1003 drive->name, capacity, sectors_to_MB(capacity));
1004
1005 /* Only print cache size when it was specified */
1006 if (id->buf_size)
1007 printk (" w/%dKiB Cache", id->buf_size/2);
1008
1009 printk(", CHS=%d/%d/%d",
1010 drive->bios_cyl, drive->bios_head, drive->bios_sect);
1011 if (drive->using_dma)
1012 ide_dma_verbose(drive);
1013 printk("\n");
1014
1015 /* write cache enabled? */
1016 if ((id->csfo & 1) || (id->cfs_enable_1 & (1 << 5)))
1017 drive->wcache = 1;
1018
1019 write_cache(drive, 1);
1020 }
1021
1022 static void ide_cacheflush_p(ide_drive_t *drive)
1023 {
1024 if (!drive->wcache || !ide_id_has_flush_cache(drive->id))
1025 return;
1026
1027 if (do_idedisk_flushcache(drive))
1028 printk(KERN_INFO "%s: wcache flush failed!\n", drive->name);
1029 }
1030
1031 static void ide_disk_remove(ide_drive_t *drive)
1032 {
1033 struct ide_disk_obj *idkp = drive->driver_data;
1034 struct gendisk *g = idkp->disk;
1035
1036 ide_proc_unregister_driver(drive, idkp->driver);
1037
1038 del_gendisk(g);
1039
1040 ide_cacheflush_p(drive);
1041
1042 ide_disk_put(idkp);
1043 }
1044
1045 static void ide_disk_release(struct kref *kref)
1046 {
1047 struct ide_disk_obj *idkp = to_ide_disk(kref);
1048 ide_drive_t *drive = idkp->drive;
1049 struct gendisk *g = idkp->disk;
1050
1051 drive->driver_data = NULL;
1052 g->private_data = NULL;
1053 put_disk(g);
1054 kfree(idkp);
1055 }
1056
1057 static int ide_disk_probe(ide_drive_t *drive);
1058
1059 /*
1060 * On HPA drives the capacity needs to be
1061 * reinitilized on resume otherwise the disk
1062 * can not be used and a hard reset is required
1063 */
1064 static void ide_disk_resume(ide_drive_t *drive)
1065 {
1066 if (idedisk_supports_hpa(drive->id))
1067 init_idedisk_capacity(drive);
1068 }
1069
1070 static void ide_device_shutdown(ide_drive_t *drive)
1071 {
1072 #ifdef CONFIG_ALPHA
1073 /* On Alpha, halt(8) doesn't actually turn the machine off,
1074 it puts you into the sort of firmware monitor. Typically,
1075 it's used to boot another kernel image, so it's not much
1076 different from reboot(8). Therefore, we don't need to
1077 spin down the disk in this case, especially since Alpha
1078 firmware doesn't handle disks in standby mode properly.
1079 On the other hand, it's reasonably safe to turn the power
1080 off when the shutdown process reaches the firmware prompt,
1081 as the firmware initialization takes rather long time -
1082 at least 10 seconds, which should be sufficient for
1083 the disk to expire its write cache. */
1084 if (system_state != SYSTEM_POWER_OFF) {
1085 #else
1086 if (system_state == SYSTEM_RESTART) {
1087 #endif
1088 ide_cacheflush_p(drive);
1089 return;
1090 }
1091
1092 printk("Shutdown: %s\n", drive->name);
1093 drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND);
1094 }
1095
1096 static ide_driver_t idedisk_driver = {
1097 .gen_driver = {
1098 .owner = THIS_MODULE,
1099 .name = "ide-disk",
1100 .bus = &ide_bus_type,
1101 },
1102 .probe = ide_disk_probe,
1103 .remove = ide_disk_remove,
1104 .resume = ide_disk_resume,
1105 .shutdown = ide_device_shutdown,
1106 .version = IDEDISK_VERSION,
1107 .media = ide_disk,
1108 .supports_dsc_overlap = 0,
1109 .do_request = ide_do_rw_disk,
1110 .end_request = ide_end_request,
1111 .error = __ide_error,
1112 .abort = __ide_abort,
1113 #ifdef CONFIG_IDE_PROC_FS
1114 .proc = idedisk_proc,
1115 #endif
1116 };
1117
1118 static int idedisk_open(struct inode *inode, struct file *filp)
1119 {
1120 struct gendisk *disk = inode->i_bdev->bd_disk;
1121 struct ide_disk_obj *idkp;
1122 ide_drive_t *drive;
1123
1124 if (!(idkp = ide_disk_get(disk)))
1125 return -ENXIO;
1126
1127 drive = idkp->drive;
1128
1129 idkp->openers++;
1130
1131 if (drive->removable && idkp->openers == 1) {
1132 ide_task_t args;
1133 memset(&args, 0, sizeof(ide_task_t));
1134 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORLOCK;
1135 args.command_type = IDE_DRIVE_TASK_NO_DATA;
1136 args.handler = &task_no_data_intr;
1137 check_disk_change(inode->i_bdev);
1138 /*
1139 * Ignore the return code from door_lock,
1140 * since the open() has already succeeded,
1141 * and the door_lock is irrelevant at this point.
1142 */
1143 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
1144 drive->doorlocking = 0;
1145 }
1146 return 0;
1147 }
1148
1149 static int idedisk_release(struct inode *inode, struct file *filp)
1150 {
1151 struct gendisk *disk = inode->i_bdev->bd_disk;
1152 struct ide_disk_obj *idkp = ide_disk_g(disk);
1153 ide_drive_t *drive = idkp->drive;
1154
1155 if (idkp->openers == 1)
1156 ide_cacheflush_p(drive);
1157
1158 if (drive->removable && idkp->openers == 1) {
1159 ide_task_t args;
1160 memset(&args, 0, sizeof(ide_task_t));
1161 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORUNLOCK;
1162 args.command_type = IDE_DRIVE_TASK_NO_DATA;
1163 args.handler = &task_no_data_intr;
1164 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
1165 drive->doorlocking = 0;
1166 }
1167
1168 idkp->openers--;
1169
1170 ide_disk_put(idkp);
1171
1172 return 0;
1173 }
1174
1175 static int idedisk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1176 {
1177 struct ide_disk_obj *idkp = ide_disk_g(bdev->bd_disk);
1178 ide_drive_t *drive = idkp->drive;
1179
1180 geo->heads = drive->bios_head;
1181 geo->sectors = drive->bios_sect;
1182 geo->cylinders = (u16)drive->bios_cyl; /* truncate */
1183 return 0;
1184 }
1185
1186 static int idedisk_ioctl(struct inode *inode, struct file *file,
1187 unsigned int cmd, unsigned long arg)
1188 {
1189 unsigned long flags;
1190 struct block_device *bdev = inode->i_bdev;
1191 struct ide_disk_obj *idkp = ide_disk_g(bdev->bd_disk);
1192 ide_drive_t *drive = idkp->drive;
1193 int err, (*setfunc)(ide_drive_t *, int);
1194 u8 *val;
1195
1196 switch (cmd) {
1197 case HDIO_GET_ADDRESS: val = &drive->addressing; goto read_val;
1198 case HDIO_GET_MULTCOUNT: val = &drive->mult_count; goto read_val;
1199 case HDIO_GET_NOWERR: val = &drive->nowerr; goto read_val;
1200 case HDIO_GET_WCACHE: val = &drive->wcache; goto read_val;
1201 case HDIO_GET_ACOUSTIC: val = &drive->acoustic; goto read_val;
1202 case HDIO_SET_ADDRESS: setfunc = set_lba_addressing; goto set_val;
1203 case HDIO_SET_MULTCOUNT: setfunc = set_multcount; goto set_val;
1204 case HDIO_SET_NOWERR: setfunc = set_nowerr; goto set_val;
1205 case HDIO_SET_WCACHE: setfunc = write_cache; goto set_val;
1206 case HDIO_SET_ACOUSTIC: setfunc = set_acoustic; goto set_val;
1207 }
1208
1209 return generic_ide_ioctl(drive, file, bdev, cmd, arg);
1210
1211 read_val:
1212 mutex_lock(&ide_setting_mtx);
1213 spin_lock_irqsave(&ide_lock, flags);
1214 err = *val;
1215 spin_unlock_irqrestore(&ide_lock, flags);
1216 mutex_unlock(&ide_setting_mtx);
1217 return err >= 0 ? put_user(err, (long __user *)arg) : err;
1218
1219 set_val:
1220 if (bdev != bdev->bd_contains)
1221 err = -EINVAL;
1222 else {
1223 if (!capable(CAP_SYS_ADMIN))
1224 err = -EACCES;
1225 else {
1226 mutex_lock(&ide_setting_mtx);
1227 err = setfunc(drive, arg);
1228 mutex_unlock(&ide_setting_mtx);
1229 }
1230 }
1231 return err;
1232 }
1233
1234 static int idedisk_media_changed(struct gendisk *disk)
1235 {
1236 struct ide_disk_obj *idkp = ide_disk_g(disk);
1237 ide_drive_t *drive = idkp->drive;
1238
1239 /* do not scan partitions twice if this is a removable device */
1240 if (drive->attach) {
1241 drive->attach = 0;
1242 return 0;
1243 }
1244 /* if removable, always assume it was changed */
1245 return drive->removable;
1246 }
1247
1248 static int idedisk_revalidate_disk(struct gendisk *disk)
1249 {
1250 struct ide_disk_obj *idkp = ide_disk_g(disk);
1251 set_capacity(disk, idedisk_capacity(idkp->drive));
1252 return 0;
1253 }
1254
1255 static struct block_device_operations idedisk_ops = {
1256 .owner = THIS_MODULE,
1257 .open = idedisk_open,
1258 .release = idedisk_release,
1259 .ioctl = idedisk_ioctl,
1260 .getgeo = idedisk_getgeo,
1261 .media_changed = idedisk_media_changed,
1262 .revalidate_disk= idedisk_revalidate_disk
1263 };
1264
1265 MODULE_DESCRIPTION("ATA DISK Driver");
1266
1267 static int ide_disk_probe(ide_drive_t *drive)
1268 {
1269 struct ide_disk_obj *idkp;
1270 struct gendisk *g;
1271
1272 /* strstr("foo", "") is non-NULL */
1273 if (!strstr("ide-disk", drive->driver_req))
1274 goto failed;
1275 if (!drive->present)
1276 goto failed;
1277 if (drive->media != ide_disk)
1278 goto failed;
1279
1280 idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
1281 if (!idkp)
1282 goto failed;
1283
1284 g = alloc_disk_node(1 << PARTN_BITS,
1285 hwif_to_node(drive->hwif));
1286 if (!g)
1287 goto out_free_idkp;
1288
1289 ide_init_disk(g, drive);
1290
1291 ide_proc_register_driver(drive, &idedisk_driver);
1292
1293 kref_init(&idkp->kref);
1294
1295 idkp->drive = drive;
1296 idkp->driver = &idedisk_driver;
1297 idkp->disk = g;
1298
1299 g->private_data = &idkp->driver;
1300
1301 drive->driver_data = idkp;
1302
1303 idedisk_setup(drive);
1304 if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
1305 printk(KERN_ERR "%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
1306 drive->name, drive->head);
1307 drive->attach = 0;
1308 } else
1309 drive->attach = 1;
1310
1311 g->minors = 1 << PARTN_BITS;
1312 g->driverfs_dev = &drive->gendev;
1313 g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
1314 set_capacity(g, idedisk_capacity(drive));
1315 g->fops = &idedisk_ops;
1316 add_disk(g);
1317 return 0;
1318
1319 out_free_idkp:
1320 kfree(idkp);
1321 failed:
1322 return -ENODEV;
1323 }
1324
1325 static void __exit idedisk_exit (void)
1326 {
1327 driver_unregister(&idedisk_driver.gen_driver);
1328 }
1329
1330 static int __init idedisk_init(void)
1331 {
1332 return driver_register(&idedisk_driver.gen_driver);
1333 }
1334
1335 MODULE_ALIAS("ide:*m-disk*");
1336 module_init(idedisk_init);
1337 module_exit(idedisk_exit);
1338 MODULE_LICENSE("GPL");
kernel-based virtual machine