summaryrefslogtreecommitdiff
path: root/drivers/ide/ide-proc.c
blob: e73016cbd40671eaac568a2e388106a7d67b08f9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Copyright (C) 1997-1998	Mark Lord
 *  Copyright (C) 2003		Red Hat
 *
 *  Some code was moved here from ide.c, see it for original copyrights.
 */

/*
 * This is the /proc/ide/ filesystem implementation.
 *
 * Drive/Driver settings can be retrieved by reading the drive's
 * "settings" files.  e.g.    "cat /proc/ide0/hda/settings"
 * To write a new value "val" into a specific setting "name", use:
 *   echo "name:val" >/proc/ide/ide0/hda/settings
 */

#include <linux/module.h>

#include <linux/uaccess.h>
#include <linux/errno.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/ctype.h>
#include <linux/ide.h>
#include <linux/seq_file.h>
#include <linux/slab.h>

#include <asm/io.h>

static struct proc_dir_entry *proc_ide_root;

static int ide_imodel_proc_show(struct seq_file *m, void *v)
{
	ide_hwif_t	*hwif = (ide_hwif_t *) m->private;
	const char	*name;

	switch (hwif->chipset) {
	case ide_generic:	name = "generic";	break;
	case ide_pci:		name = "pci";		break;
	case ide_cmd640:	name = "cmd640";	break;
	case ide_dtc2278:	name = "dtc2278";	break;
	case ide_ali14xx:	name = "ali14xx";	break;
	case ide_qd65xx:	name = "qd65xx";	break;
	case ide_umc8672:	name = "umc8672";	break;
	case ide_ht6560b:	name = "ht6560b";	break;
	case ide_4drives:	name = "4drives";	break;
	case ide_pmac:		name = "mac-io";	break;
	case ide_au1xxx:	name = "au1xxx";	break;
	case ide_palm3710:      name = "palm3710";      break;
	case ide_acorn:		name = "acorn";		break;
	default:		name = "(unknown)";	break;
	}
	seq_printf(m, "%s\n", name);
	return 0;
}

static int ide_mate_proc_show(struct seq_file *m, void *v)
{
	ide_hwif_t	*hwif = (ide_hwif_t *) m->private;

	if (hwif && hwif->mate)
		seq_printf(m, "%s\n", hwif->mate->name);
	else
		seq_printf(m, "(none)\n");
	return 0;
}

static int ide_channel_proc_show(struct seq_file *m, void *v)
{
	ide_hwif_t	*hwif = (ide_hwif_t *) m->private;

	seq_printf(m, "%c\n", hwif->channel ? '1' : '0');
	return 0;
}

static int ide_identify_proc_show(struct seq_file *m, void *v)
{
	ide_drive_t *drive = (ide_drive_t *)m->private;
	u8 *buf;

	if (!drive) {
		seq_putc(m, '\n');
		return 0;
	}

	buf = kmalloc(SECTOR_SIZE, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	if (taskfile_lib_get_identify(drive, buf) == 0) {
		__le16 *val = (__le16 *)buf;
		int i;

		for (i = 0; i < SECTOR_SIZE / 2; i++) {
			seq_printf(m, "%04x%c", le16_to_cpu(val[i]),
					(i % 8) == 7 ? '\n' : ' ');
		}
	} else
		seq_putc(m, buf[0]);
	kfree(buf);
	return 0;
}

/**
 *	ide_find_setting	-	find a specific setting
 *	@st: setting table pointer
 *	@name: setting name
 *
 *	Scan's the setting table for a matching entry and returns
 *	this or NULL if no entry is found. The caller must hold the
 *	setting semaphore
 */

static
const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
					       char *name)
{
	while (st->name) {
		if (strcmp(st->name, name) == 0)
			break;
		st++;
	}
	return st->name ? st : NULL;
}

/**
 *	ide_read_setting	-	read an IDE setting
 *	@drive: drive to read from
 *	@setting: drive setting
 *
 *	Read a drive setting and return the value. The caller
 *	must hold the ide_setting_mtx when making this call.
 *
 *	BUGS: the data return and error are the same return value
 *	so an error -EINVAL and true return of the same value cannot
 *	be told apart
 */

static int ide_read_setting(ide_drive_t *drive,
			    const struct ide_proc_devset *setting)
{
	const struct ide_devset *ds = setting->setting;
	int val = -EINVAL;

	if (ds->get)
		val = ds->get(drive);

	return val;
}

/**
 *	ide_write_setting	-	read an IDE setting
 *	@drive: drive to read from
 *	@setting: drive setting
 *	@val: value
 *
 *	Write a drive setting if it is possible. The caller
 *	must hold the ide_setting_mtx when making this call.
 *
 *	BUGS: the data return and error are the same return value
 *	so an error -EINVAL and true return of the same value cannot
 *	be told apart
 *
 *	FIXME:  This should be changed to enqueue a special request
 *	to the driver to change settings, and then wait on a sema for completion.
 *	The current scheme of polling is kludgy, though safe enough.
 */

static int ide_write_setting(ide_drive_t *drive,
			     const struct ide_proc_devset *setting, int val)
{
	const struct ide_devset *ds = setting->setting;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (!ds->set)
		return -EPERM;
	if ((ds->flags & DS_SYNC)
	    && (val < setting->min || val > setting->max))
		return -EINVAL;
	return ide_devset_execute(drive, ds, val);
}

ide_devset_get(xfer_rate, current_speed);

static int set_xfer_rate (ide_drive_t *drive, int arg)
{
	struct ide_cmd cmd;

	if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
		return -EINVAL;

	memset(&cmd, 0, sizeof(cmd));
	cmd.tf.command = ATA_CMD_SET_FEATURES;
	cmd.tf.feature = SETFEATURES_XFER;
	cmd.tf.nsect   = (u8)arg;
	cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
	cmd.valid.in.tf  = IDE_VALID_NSECT;
	cmd.tf_flags   = IDE_TFLAG_SET_XFER;

	return ide_no_data_taskfile(drive, &cmd);
}

ide_devset_rw(current_speed, xfer_rate);
ide_devset_rw_field(init_speed, init_speed);
ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
ide_devset_ro_field(number, dn);

static const struct ide_proc_devset ide_generic_settings[] = {
	IDE_PROC_DEVSET(current_speed, 0, 70),
	IDE_PROC_DEVSET(init_speed, 0, 70),
	IDE_PROC_DEVSET(io_32bit,  0, 1 + (SUPPORT_VLB_SYNC << 1)),
	IDE_PROC_DEVSET(keepsettings, 0, 1),
	IDE_PROC_DEVSET(nice1, 0, 1),
	IDE_PROC_DEVSET(number, 0, 3),
	IDE_PROC_DEVSET(pio_mode, 0, 255),
	IDE_PROC_DEVSET(unmaskirq, 0, 1),
	IDE_PROC_DEVSET(using_dma, 0, 1),
	{ NULL },
};

static void proc_ide_settings_warn(void)
{
	printk_once(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
			    "obsolete, and will be removed soon!\n");
}

static int ide_settings_proc_show(struct seq_file *m, void *v)
{
	const struct ide_proc_devset *setting, *g, *d;
	const struct ide_devset *ds;
	ide_drive_t	*drive = (ide_drive_t *) m->private;
	int		rc, mul_factor, div_factor;

	proc_ide_settings_warn();

	mutex_lock(&ide_setting_mtx);
	g = ide_generic_settings;
	d = drive->settings;
	seq_printf(m, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
	seq_printf(m, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
	while (g->name || (d && d->name)) {
		/* read settings in the alphabetical order */
		if (g->name && d && d->name) {
			if (strcmp(d->name, g->name) < 0)
				setting = d++;
			else
				setting = g++;
		} else if (d && d->name) {
			setting = d++;
		} else
			setting = g++;
		mul_factor = setting->mulf ? setting->mulf(drive) : 1;
		div_factor = setting->divf ? setting->divf(drive) : 1;
		seq_printf(m, "%-24s", setting->name);
		rc = ide_read_setting(drive, setting);
		if (rc >= 0)
			seq_printf(m, "%-16d", rc * mul_factor / div_factor);
		else
			seq_printf(m, "%-16s", "write-only");
		seq_printf(m, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
		ds = setting->setting;
		if (ds->get)
			seq_printf(m, "r");
		if (ds->set)
			seq_printf(m, "w");
		seq_printf(m, "\n");
	}
	mutex_unlock(&ide_setting_mtx);
	return 0;
}

static int ide_settings_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, ide_settings_proc_show, PDE_DATA(inode));
}

#define MAX_LEN	30

static ssize_t ide_settings_proc_write(struct file *file, const char __user *buffer,
				       size_t count, loff_t *pos)
{
	ide_drive_t	*drive = PDE_DATA(file_inode(file));
	char		name[MAX_LEN + 1];
	int		for_real = 0, mul_factor, div_factor;
	unsigned long	n;

	const struct ide_proc_devset *setting;
	char *buf, *s;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	proc_ide_settings_warn();

	if (count >= PAGE_SIZE)
		return -EINVAL;

	s = buf = (char *)__get_free_page(GFP_USER);
	if (!buf)
		return -ENOMEM;

	if (copy_from_user(buf, buffer, count)) {
		free_page((unsigned long)buf);
		return -EFAULT;
	}

	buf[count] = '\0';

	/*
	 * Skip over leading whitespace
	 */
	while (count && isspace(*s)) {
		--count;
		++s;
	}
	/*
	 * Do one full pass to verify all parameters,
	 * then do another to actually write the new settings.
	 */
	do {
		char *p = s;
		n = count;
		while (n > 0) {
			unsigned val;
			char *q = p;

			while (n > 0 && *p != ':') {
				--n;
				p++;
			}
			if (*p != ':')
				goto parse_error;
			if (p - q > MAX_LEN)
				goto parse_error;
			memcpy(name, q, p - q);
			name[p - q] = 0;

			if (n > 0) {
				--n;
				p++;
			} else
				goto parse_error;

			val = simple_strtoul(p, &q, 10);
			n -= q - p;
			p = q;
			if (n > 0 && !isspace(*p))
				goto parse_error;
			while (n > 0 && isspace(*p)) {
				--n;
				++p;
			}

			mutex_lock(&ide_setting_mtx);
			/* generic settings first, then driver specific ones */
			setting = ide_find_setting(ide_generic_settings, name);
			if (!setting) {
				if (drive->settings)
					setting = ide_find_setting(drive->settings, name);
				if (!setting) {
					mutex_unlock(&ide_setting_mtx);
					goto parse_error;
				}
			}
			if (for_real) {
				mul_factor = setting->mulf ? setting->mulf(drive) : 1;
				div_factor = setting->divf ? setting->divf(drive) : 1;
				ide_write_setting(drive, setting, val * div_factor / mul_factor);
			}
			mutex_unlock(&ide_setting_mtx);
		}
	} while (!for_real++);
	free_page((unsigned long)buf);
	return count;
parse_error:
	free_page((unsigned long)buf);
	printk("%s(): parse error\n", __func__);
	return -EINVAL;
}

static const struct file_operations ide_settings_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= ide_settings_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= ide_settings_proc_write,
};

int ide_capacity_proc_show(struct seq_file *m, void *v)
{
	seq_printf(m, "%llu\n", (long long)0x7fffffff);
	return 0;
}
EXPORT_SYMBOL_GPL(ide_capacity_proc_show);

int ide_geometry_proc_show(struct seq_file *m, void *v)
{
	ide_drive_t	*drive = (ide_drive_t *) m->private;

	seq_printf(m, "physical     %d/%d/%d\n",
			drive->cyl, drive->head, drive->sect);
	seq_printf(m, "logical      %d/%d/%d\n",
			drive->bios_cyl, drive->bios_head, drive->bios_sect);
	return 0;
}
EXPORT_SYMBOL(ide_geometry_proc_show);

static int ide_dmodel_proc_show(struct seq_file *seq, void *v)
{
	ide_drive_t	*drive = (ide_drive_t *) seq->private;
	char		*m = (char *)&drive->id[ATA_ID_PROD];

	seq_printf(seq, "%.40s\n", m[0] ? m : "(none)");
	return 0;
}

static int ide_driver_proc_show(struct seq_file *m, void *v)
{
	ide_drive_t		*drive = (ide_drive_t *)m->private;
	struct device		*dev = &drive->gendev;
	struct ide_driver	*ide_drv;

	if (dev->driver) {
		ide_drv = to_ide_driver(dev->driver);
		seq_printf(m, "%s version %s\n",
				dev->driver->name, ide_drv->version);
	} else
		seq_printf(m, "ide-default version 0.9.newide\n");
	return 0;
}

static int ide_media_proc_show(struct seq_file *m, void *v)
{
	ide_drive_t	*drive = (ide_drive_t *) m->private;
	const char	*media;

	switch (drive->media) {
	case ide_disk:		media = "disk\n";	break;
	case ide_cdrom:		media = "cdrom\n";	break;
	case ide_tape:		media = "tape\n";	break;
	case ide_floppy:	media = "floppy\n";	break;
	case ide_optical:	media = "optical\n";	break;
	default:		media = "UNKNOWN\n";	break;
	}
	seq_puts(m, media);
	return 0;
}

static int ide_media_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, ide_media_proc_show, PDE_DATA(inode));
}

static const struct file_operations ide_media_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= ide_media_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static ide_proc_entry_t generic_drive_entries[] = {
	{ "driver",	S_IFREG|S_IRUGO,	 ide_driver_proc_show	},
	{ "identify",	S_IFREG|S_IRUSR,	 ide_identify_proc_show	},
	{ "media",	S_IFREG|S_IRUGO,	 ide_media_proc_show	},
	{ "model",	S_IFREG|S_IRUGO,	 ide_dmodel_proc_show	},
	{}
};

static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
{
	struct proc_dir_entry *ent;

	if (!dir || !p)
		return;
	while (p->name != NULL) {
		ent = proc_create_single_data(p->name, p->mode, dir, p->show, data);
		if (!ent) return;
		p++;
	}
}

static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
{
	if (!dir || !p)
		return;
	while (p->name != NULL) {
		remove_proc_entry(p->name, dir);
		p++;
	}
}

void ide_proc_register_driver(ide_drive_t *drive, struct ide_driver *driver)
{
	mutex_lock(&ide_setting_mtx);
	drive->settings = driver->proc_devsets(drive);
	mutex_unlock(&ide_setting_mtx);

	ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
}

EXPORT_SYMBOL(ide_proc_register_driver);

/**
 *	ide_proc_unregister_driver	-	remove driver specific data
 *	@drive: drive
 *	@driver: driver
 *
 *	Clean up the driver specific /proc files and IDE settings
 *	for a given drive.
 *
 *	Takes ide_setting_mtx.
 */

void ide_proc_unregister_driver(ide_drive_t *drive, struct ide_driver *driver)
{
	ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));

	mutex_lock(&ide_setting_mtx);
	/*
	 * ide_setting_mtx protects both the settings list and the use
	 * of settings (we cannot take a setting out that is being used).
	 */
	drive->settings = NULL;
	mutex_unlock(&ide_setting_mtx);
}
EXPORT_SYMBOL(ide_proc_unregister_driver);

void ide_proc_port_register_devices(ide_hwif_t *hwif)
{
	struct proc_dir_entry *ent;
	struct proc_dir_entry *parent = hwif->proc;
	ide_drive_t *drive;
	char name[64];
	int i;

	ide_port_for_each_dev(i, drive, hwif) {
		if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
			continue;

		drive->proc = proc_mkdir(drive->name, parent);
		if (drive->proc) {
			ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
			proc_create_data("settings", S_IFREG|S_IRUSR|S_IWUSR,
					drive->proc, &ide_settings_proc_fops,
					drive);
		}
		sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
		ent = proc_symlink(drive->name, proc_ide_root, name);
		if (!ent) return;
	}
}

void ide_proc_unregister_device(ide_drive_t *drive)
{
	if (drive->proc) {
		remove_proc_entry("settings", drive->proc);
		ide_remove_proc_entries(drive->proc, generic_drive_entries);
		remove_proc_entry(drive->name, proc_ide_root);
		remove_proc_entry(drive->name, drive->hwif->proc);
		drive->proc = NULL;
	}
}

static ide_proc_entry_t hwif_entries[] = {
	{ "channel",	S_IFREG|S_IRUGO,	ide_channel_proc_show	},
	{ "mate",	S_IFREG|S_IRUGO,	ide_mate_proc_show	},
	{ "model",	S_IFREG|S_IRUGO,	ide_imodel_proc_show	},
	{}
};

void ide_proc_register_port(ide_hwif_t *hwif)
{
	if (!hwif->proc) {
		hwif->proc = proc_mkdir(hwif->name, proc_ide_root);

		if (!hwif->proc)
			return;

		ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
	}
}

void ide_proc_unregister_port(ide_hwif_t *hwif)
{
	if (hwif->proc) {
		ide_remove_proc_entries(hwif->proc, hwif_entries);
		remove_proc_entry(hwif->name, proc_ide_root);
		hwif->proc = NULL;
	}
}

static int proc_print_driver(struct device_driver *drv, void *data)
{
	struct ide_driver *ide_drv = to_ide_driver(drv);
	struct seq_file *s = data;

	seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);

	return 0;
}

static int ide_drivers_show(struct seq_file *s, void *p)
{
	int err;

	err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
	if (err < 0)
		printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
			__func__, err);
	return 0;
}

DEFINE_SHOW_ATTRIBUTE(ide_drivers);

void proc_ide_create(void)
{
	proc_ide_root = proc_mkdir("ide", NULL);

	if (!proc_ide_root)
		return;

	proc_create("drivers", 0, proc_ide_root, &ide_drivers_fops);
}

void proc_ide_destroy(void)
{
	remove_proc_entry("drivers", proc_ide_root);
	remove_proc_entry("ide", NULL);
}