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dm: dec_pending needs locking to save error value
[linux-2.6/verdex.git] / drivers / ide / ide-proc.c
blob3242698832a40c07d02c2dabbd60b338eeb15d69
1 /*
2 * Copyright (C) 1997-1998 Mark Lord
3 * Copyright (C) 2003 Red Hat
4 *
5 * Some code was moved here from ide.c, see it for original copyrights.
6 */
7
8 /*
9 * This is the /proc/ide/ filesystem implementation.
10 *
11 * Drive/Driver settings can be retrieved by reading the drive's
12 * "settings" files. e.g. "cat /proc/ide0/hda/settings"
13 * To write a new value "val" into a specific setting "name", use:
14 * echo "name:val" >/proc/ide/ide0/hda/settings
15 */
16
17 #include <linux/module.h>
18
19 #include <asm/uaccess.h>
20 #include <linux/errno.h>
21 #include <linux/proc_fs.h>
22 #include <linux/stat.h>
23 #include <linux/mm.h>
24 #include <linux/pci.h>
25 #include <linux/ctype.h>
26 #include <linux/ide.h>
27 #include <linux/seq_file.h>
28
29 #include <asm/io.h>
30
31 static struct proc_dir_entry *proc_ide_root;
32
33 static int proc_ide_read_imodel
34 (char *page, char **start, off_t off, int count, int *eof, void *data)
35 {
36 ide_hwif_t *hwif = (ide_hwif_t *) data;
37 int len;
38 const char *name;
39
40 switch (hwif->chipset) {
41 case ide_generic: name = "generic"; break;
42 case ide_pci: name = "pci"; break;
43 case ide_cmd640: name = "cmd640"; break;
44 case ide_dtc2278: name = "dtc2278"; break;
45 case ide_ali14xx: name = "ali14xx"; break;
46 case ide_qd65xx: name = "qd65xx"; break;
47 case ide_umc8672: name = "umc8672"; break;
48 case ide_ht6560b: name = "ht6560b"; break;
49 case ide_4drives: name = "4drives"; break;
50 case ide_pmac: name = "mac-io"; break;
51 case ide_au1xxx: name = "au1xxx"; break;
52 case ide_palm3710: name = "palm3710"; break;
53 case ide_acorn: name = "acorn"; break;
54 default: name = "(unknown)"; break;
55 }
56 len = sprintf(page, "%s\n", name);
57 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
58 }
59
60 static int proc_ide_read_mate
61 (char *page, char **start, off_t off, int count, int *eof, void *data)
62 {
63 ide_hwif_t *hwif = (ide_hwif_t *) data;
64 int len;
65
66 if (hwif && hwif->mate)
67 len = sprintf(page, "%s\n", hwif->mate->name);
68 else
69 len = sprintf(page, "(none)\n");
70 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
71 }
72
73 static int proc_ide_read_channel
74 (char *page, char **start, off_t off, int count, int *eof, void *data)
75 {
76 ide_hwif_t *hwif = (ide_hwif_t *) data;
77 int len;
78
79 page[0] = hwif->channel ? '1' : '0';
80 page[1] = '\n';
81 len = 2;
82 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
83 }
84
85 static int proc_ide_read_identify
86 (char *page, char **start, off_t off, int count, int *eof, void *data)
87 {
88 ide_drive_t *drive = (ide_drive_t *)data;
89 int len = 0, i = 0;
90 int err = 0;
91
92 len = sprintf(page, "\n");
93
94 if (drive) {
95 __le16 *val = (__le16 *)page;
96
97 err = taskfile_lib_get_identify(drive, page);
98 if (!err) {
99 char *out = (char *)page + SECTOR_SIZE;
100
101 page = out;
102 do {
103 out += sprintf(out, "%04x%c",
104 le16_to_cpup(val), (++i & 7) ? ' ' : '\n');
105 val += 1;
106 } while (i < SECTOR_SIZE / 2);
107 len = out - page;
108 }
109 }
110 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
111 }
112
113 /**
114 * ide_find_setting - find a specific setting
115 * @st: setting table pointer
116 * @name: setting name
117 *
118 * Scan's the setting table for a matching entry and returns
119 * this or NULL if no entry is found. The caller must hold the
120 * setting semaphore
121 */
122
123 static
124 const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
125 char *name)
126 {
127 while (st->name) {
128 if (strcmp(st->name, name) == 0)
129 break;
130 st++;
131 }
132 return st->name ? st : NULL;
133 }
134
135 /**
136 * ide_read_setting - read an IDE setting
137 * @drive: drive to read from
138 * @setting: drive setting
139 *
140 * Read a drive setting and return the value. The caller
141 * must hold the ide_setting_mtx when making this call.
142 *
143 * BUGS: the data return and error are the same return value
144 * so an error -EINVAL and true return of the same value cannot
145 * be told apart
146 */
147
148 static int ide_read_setting(ide_drive_t *drive,
149 const struct ide_proc_devset *setting)
150 {
151 const struct ide_devset *ds = setting->setting;
152 int val = -EINVAL;
153
154 if (ds->get)
155 val = ds->get(drive);
156
157 return val;
158 }
159
160 /**
161 * ide_write_setting - read an IDE setting
162 * @drive: drive to read from
163 * @setting: drive setting
164 * @val: value
165 *
166 * Write a drive setting if it is possible. The caller
167 * must hold the ide_setting_mtx when making this call.
168 *
169 * BUGS: the data return and error are the same return value
170 * so an error -EINVAL and true return of the same value cannot
171 * be told apart
172 *
173 * FIXME: This should be changed to enqueue a special request
174 * to the driver to change settings, and then wait on a sema for completion.
175 * The current scheme of polling is kludgy, though safe enough.
176 */
177
178 static int ide_write_setting(ide_drive_t *drive,
179 const struct ide_proc_devset *setting, int val)
180 {
181 const struct ide_devset *ds = setting->setting;
182
183 if (!capable(CAP_SYS_ADMIN))
184 return -EACCES;
185 if (!ds->set)
186 return -EPERM;
187 if ((ds->flags & DS_SYNC)
188 && (val < setting->min || val > setting->max))
189 return -EINVAL;
190 return ide_devset_execute(drive, ds, val);
191 }
192
193 ide_devset_get(xfer_rate, current_speed);
194
195 static int set_xfer_rate (ide_drive_t *drive, int arg)
196 {
197 struct ide_cmd cmd;
198 int err;
199
200 if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
201 return -EINVAL;
202
203 memset(&cmd, 0, sizeof(cmd));
204 cmd.tf.command = ATA_CMD_SET_FEATURES;
205 cmd.tf.feature = SETFEATURES_XFER;
206 cmd.tf.nsect = (u8)arg;
207 cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
208 cmd.valid.in.tf = IDE_VALID_NSECT;
209
210 err = ide_no_data_taskfile(drive, &cmd);
211
212 if (!err) {
213 ide_set_xfer_rate(drive, (u8) arg);
214 ide_driveid_update(drive);
215 }
216 return err;
217 }
218
219 ide_devset_rw(current_speed, xfer_rate);
220 ide_devset_rw_field(init_speed, init_speed);
221 ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
222 ide_devset_rw_field(number, dn);
223
224 static const struct ide_proc_devset ide_generic_settings[] = {
225 IDE_PROC_DEVSET(current_speed, 0, 70),
226 IDE_PROC_DEVSET(init_speed, 0, 70),
227 IDE_PROC_DEVSET(io_32bit, 0, 1 + (SUPPORT_VLB_SYNC << 1)),
228 IDE_PROC_DEVSET(keepsettings, 0, 1),
229 IDE_PROC_DEVSET(nice1, 0, 1),
230 IDE_PROC_DEVSET(number, 0, 3),
231 IDE_PROC_DEVSET(pio_mode, 0, 255),
232 IDE_PROC_DEVSET(unmaskirq, 0, 1),
233 IDE_PROC_DEVSET(using_dma, 0, 1),
234 { NULL },
235 };
236
237 static void proc_ide_settings_warn(void)
238 {
239 static int warned;
240
241 if (warned)
242 return;
243
244 printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
245 "obsolete, and will be removed soon!\n");
246 warned = 1;
247 }
248
249 static int proc_ide_read_settings
250 (char *page, char **start, off_t off, int count, int *eof, void *data)
251 {
252 const struct ide_proc_devset *setting, *g, *d;
253 const struct ide_devset *ds;
254 ide_drive_t *drive = (ide_drive_t *) data;
255 char *out = page;
256 int len, rc, mul_factor, div_factor;
257
258 proc_ide_settings_warn();
259
260 mutex_lock(&ide_setting_mtx);
261 g = ide_generic_settings;
262 d = drive->settings;
263 out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
264 out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
265 while (g->name || (d && d->name)) {
266 /* read settings in the alphabetical order */
267 if (g->name && d && d->name) {
268 if (strcmp(d->name, g->name) < 0)
269 setting = d++;
270 else
271 setting = g++;
272 } else if (d && d->name) {
273 setting = d++;
274 } else
275 setting = g++;
276 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
277 div_factor = setting->divf ? setting->divf(drive) : 1;
278 out += sprintf(out, "%-24s", setting->name);
279 rc = ide_read_setting(drive, setting);
280 if (rc >= 0)
281 out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
282 else
283 out += sprintf(out, "%-16s", "write-only");
284 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
285 ds = setting->setting;
286 if (ds->get)
287 out += sprintf(out, "r");
288 if (ds->set)
289 out += sprintf(out, "w");
290 out += sprintf(out, "\n");
291 }
292 len = out - page;
293 mutex_unlock(&ide_setting_mtx);
294 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
295 }
296
297 #define MAX_LEN 30
298
299 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
300 unsigned long count, void *data)
301 {
302 ide_drive_t *drive = (ide_drive_t *) data;
303 char name[MAX_LEN + 1];
304 int for_real = 0, mul_factor, div_factor;
305 unsigned long n;
306
307 const struct ide_proc_devset *setting;
308 char *buf, *s;
309
310 if (!capable(CAP_SYS_ADMIN))
311 return -EACCES;
312
313 proc_ide_settings_warn();
314
315 if (count >= PAGE_SIZE)
316 return -EINVAL;
317
318 s = buf = (char *)__get_free_page(GFP_USER);
319 if (!buf)
320 return -ENOMEM;
321
322 if (copy_from_user(buf, buffer, count)) {
323 free_page((unsigned long)buf);
324 return -EFAULT;
325 }
326
327 buf[count] = '\0';
328
329 /*
330 * Skip over leading whitespace
331 */
332 while (count && isspace(*s)) {
333 --count;
334 ++s;
335 }
336 /*
337 * Do one full pass to verify all parameters,
338 * then do another to actually write the new settings.
339 */
340 do {
341 char *p = s;
342 n = count;
343 while (n > 0) {
344 unsigned val;
345 char *q = p;
346
347 while (n > 0 && *p != ':') {
348 --n;
349 p++;
350 }
351 if (*p != ':')
352 goto parse_error;
353 if (p - q > MAX_LEN)
354 goto parse_error;
355 memcpy(name, q, p - q);
356 name[p - q] = 0;
357
358 if (n > 0) {
359 --n;
360 p++;
361 } else
362 goto parse_error;
363
364 val = simple_strtoul(p, &q, 10);
365 n -= q - p;
366 p = q;
367 if (n > 0 && !isspace(*p))
368 goto parse_error;
369 while (n > 0 && isspace(*p)) {
370 --n;
371 ++p;
372 }
373
374 mutex_lock(&ide_setting_mtx);
375 /* generic settings first, then driver specific ones */
376 setting = ide_find_setting(ide_generic_settings, name);
377 if (!setting) {
378 if (drive->settings)
379 setting = ide_find_setting(drive->settings, name);
380 if (!setting) {
381 mutex_unlock(&ide_setting_mtx);
382 goto parse_error;
383 }
384 }
385 if (for_real) {
386 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
387 div_factor = setting->divf ? setting->divf(drive) : 1;
388 ide_write_setting(drive, setting, val * div_factor / mul_factor);
389 }
390 mutex_unlock(&ide_setting_mtx);
391 }
392 } while (!for_real++);
393 free_page((unsigned long)buf);
394 return count;
395 parse_error:
396 free_page((unsigned long)buf);
397 printk("proc_ide_write_settings(): parse error\n");
398 return -EINVAL;
399 }
400
401 int proc_ide_read_capacity
402 (char *page, char **start, off_t off, int count, int *eof, void *data)
403 {
404 int len = sprintf(page, "%llu\n", (long long)0x7fffffff);
405 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
406 }
407
408 EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
409
410 int proc_ide_read_geometry
411 (char *page, char **start, off_t off, int count, int *eof, void *data)
412 {
413 ide_drive_t *drive = (ide_drive_t *) data;
414 char *out = page;
415 int len;
416
417 out += sprintf(out, "physical %d/%d/%d\n",
418 drive->cyl, drive->head, drive->sect);
419 out += sprintf(out, "logical %d/%d/%d\n",
420 drive->bios_cyl, drive->bios_head, drive->bios_sect);
421
422 len = out - page;
423 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
424 }
425
426 EXPORT_SYMBOL(proc_ide_read_geometry);
427
428 static int proc_ide_read_dmodel
429 (char *page, char **start, off_t off, int count, int *eof, void *data)
430 {
431 ide_drive_t *drive = (ide_drive_t *) data;
432 char *m = (char *)&drive->id[ATA_ID_PROD];
433 int len;
434
435 len = sprintf(page, "%.40s\n", m[0] ? m : "(none)");
436 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
437 }
438
439 static int proc_ide_read_driver
440 (char *page, char **start, off_t off, int count, int *eof, void *data)
441 {
442 ide_drive_t *drive = (ide_drive_t *)data;
443 struct device *dev = &drive->gendev;
444 struct ide_driver *ide_drv;
445 int len;
446
447 if (dev->driver) {
448 ide_drv = to_ide_driver(dev->driver);
449 len = sprintf(page, "%s version %s\n",
450 dev->driver->name, ide_drv->version);
451 } else
452 len = sprintf(page, "ide-default version 0.9.newide\n");
453 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
454 }
455
456 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
457 {
458 struct device *dev = &drive->gendev;
459 int ret = 1;
460 int err;
461
462 device_release_driver(dev);
463 /* FIXME: device can still be in use by previous driver */
464 strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
465 err = device_attach(dev);
466 if (err < 0)
467 printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
468 __func__, err);
469 drive->driver_req[0] = 0;
470 if (dev->driver == NULL) {
471 err = device_attach(dev);
472 if (err < 0)
473 printk(KERN_WARNING
474 "IDE: %s: device_attach(2) error: %d\n",
475 __func__, err);
476 }
477 if (dev->driver && !strcmp(dev->driver->name, driver))
478 ret = 0;
479
480 return ret;
481 }
482
483 static int proc_ide_write_driver
484 (struct file *file, const char __user *buffer, unsigned long count, void *data)
485 {
486 ide_drive_t *drive = (ide_drive_t *) data;
487 char name[32];
488
489 if (!capable(CAP_SYS_ADMIN))
490 return -EACCES;
491 if (count > 31)
492 count = 31;
493 if (copy_from_user(name, buffer, count))
494 return -EFAULT;
495 name[count] = '\0';
496 if (ide_replace_subdriver(drive, name))
497 return -EINVAL;
498 return count;
499 }
500
501 static int proc_ide_read_media
502 (char *page, char **start, off_t off, int count, int *eof, void *data)
503 {
504 ide_drive_t *drive = (ide_drive_t *) data;
505 const char *media;
506 int len;
507
508 switch (drive->media) {
509 case ide_disk: media = "disk\n"; break;
510 case ide_cdrom: media = "cdrom\n"; break;
511 case ide_tape: media = "tape\n"; break;
512 case ide_floppy: media = "floppy\n"; break;
513 case ide_optical: media = "optical\n"; break;
514 default: media = "UNKNOWN\n"; break;
515 }
516 strcpy(page, media);
517 len = strlen(media);
518 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
519 }
520
521 static ide_proc_entry_t generic_drive_entries[] = {
522 { "driver", S_IFREG|S_IRUGO, proc_ide_read_driver,
523 proc_ide_write_driver },
524 { "identify", S_IFREG|S_IRUSR, proc_ide_read_identify, NULL },
525 { "media", S_IFREG|S_IRUGO, proc_ide_read_media, NULL },
526 { "model", S_IFREG|S_IRUGO, proc_ide_read_dmodel, NULL },
527 { "settings", S_IFREG|S_IRUSR|S_IWUSR, proc_ide_read_settings,
528 proc_ide_write_settings },
529 { NULL, 0, NULL, NULL }
530 };
531
532 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
533 {
534 struct proc_dir_entry *ent;
535
536 if (!dir || !p)
537 return;
538 while (p->name != NULL) {
539 ent = create_proc_entry(p->name, p->mode, dir);
540 if (!ent) return;
541 ent->data = data;
542 ent->read_proc = p->read_proc;
543 ent->write_proc = p->write_proc;
544 p++;
545 }
546 }
547
548 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
549 {
550 if (!dir || !p)
551 return;
552 while (p->name != NULL) {
553 remove_proc_entry(p->name, dir);
554 p++;
555 }
556 }
557
558 void ide_proc_register_driver(ide_drive_t *drive, struct ide_driver *driver)
559 {
560 mutex_lock(&ide_setting_mtx);
561 drive->settings = driver->proc_devsets(drive);
562 mutex_unlock(&ide_setting_mtx);
563
564 ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
565 }
566
567 EXPORT_SYMBOL(ide_proc_register_driver);
568
569 /**
570 * ide_proc_unregister_driver - remove driver specific data
571 * @drive: drive
572 * @driver: driver
573 *
574 * Clean up the driver specific /proc files and IDE settings
575 * for a given drive.
576 *
577 * Takes ide_setting_mtx.
578 */
579
580 void ide_proc_unregister_driver(ide_drive_t *drive, struct ide_driver *driver)
581 {
582 ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
583
584 mutex_lock(&ide_setting_mtx);
585 /*
586 * ide_setting_mtx protects both the settings list and the use
587 * of settings (we cannot take a setting out that is being used).
588 */
589 drive->settings = NULL;
590 mutex_unlock(&ide_setting_mtx);
591 }
592 EXPORT_SYMBOL(ide_proc_unregister_driver);
593
594 void ide_proc_port_register_devices(ide_hwif_t *hwif)
595 {
596 struct proc_dir_entry *ent;
597 struct proc_dir_entry *parent = hwif->proc;
598 ide_drive_t *drive;
599 char name[64];
600 int i;
601
602 ide_port_for_each_dev(i, drive, hwif) {
603 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
604 continue;
605
606 drive->proc = proc_mkdir(drive->name, parent);
607 if (drive->proc)
608 ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
609 sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
610 ent = proc_symlink(drive->name, proc_ide_root, name);
611 if (!ent) return;
612 }
613 }
614
615 void ide_proc_unregister_device(ide_drive_t *drive)
616 {
617 if (drive->proc) {
618 ide_remove_proc_entries(drive->proc, generic_drive_entries);
619 remove_proc_entry(drive->name, proc_ide_root);
620 remove_proc_entry(drive->name, drive->hwif->proc);
621 drive->proc = NULL;
622 }
623 }
624
625 static ide_proc_entry_t hwif_entries[] = {
626 { "channel", S_IFREG|S_IRUGO, proc_ide_read_channel, NULL },
627 { "mate", S_IFREG|S_IRUGO, proc_ide_read_mate, NULL },
628 { "model", S_IFREG|S_IRUGO, proc_ide_read_imodel, NULL },
629 { NULL, 0, NULL, NULL }
630 };
631
632 void ide_proc_register_port(ide_hwif_t *hwif)
633 {
634 if (!hwif->proc) {
635 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
636
637 if (!hwif->proc)
638 return;
639
640 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
641 }
642 }
643
644 void ide_proc_unregister_port(ide_hwif_t *hwif)
645 {
646 if (hwif->proc) {
647 ide_remove_proc_entries(hwif->proc, hwif_entries);
648 remove_proc_entry(hwif->name, proc_ide_root);
649 hwif->proc = NULL;
650 }
651 }
652
653 static int proc_print_driver(struct device_driver *drv, void *data)
654 {
655 struct ide_driver *ide_drv = to_ide_driver(drv);
656 struct seq_file *s = data;
657
658 seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
659
660 return 0;
661 }
662
663 static int ide_drivers_show(struct seq_file *s, void *p)
664 {
665 int err;
666
667 err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
668 if (err < 0)
669 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
670 __func__, err);
671 return 0;
672 }
673
674 static int ide_drivers_open(struct inode *inode, struct file *file)
675 {
676 return single_open(file, &ide_drivers_show, NULL);
677 }
678
679 static const struct file_operations ide_drivers_operations = {
680 .owner = THIS_MODULE,
681 .open = ide_drivers_open,
682 .read = seq_read,
683 .llseek = seq_lseek,
684 .release = single_release,
685 };
686
687 void proc_ide_create(void)
688 {
689 proc_ide_root = proc_mkdir("ide", NULL);
690
691 if (!proc_ide_root)
692 return;
693
694 proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);
695 }
696
697 void proc_ide_destroy(void)
698 {
699 remove_proc_entry("drivers", proc_ide_root);
700 remove_proc_entry("ide", NULL);
701 }
Verdex Pro support