summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/qib/qib_fs.c
blob: e336d778e076eddb3d56c37b6fd33be0de87b050 (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
/*
 * Copyright (c) 2012 Intel Corporation. All rights reserved.
 * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
 * Copyright (c) 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/fs_context.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/namei.h>

#include "qib.h"

#define QIBFS_MAGIC 0x726a77

static struct super_block *qib_super;

#define private2dd(file) (file_inode(file)->i_private)

static int qibfs_mknod(struct inode *dir, struct dentry *dentry,
		       umode_t mode, const struct file_operations *fops,
		       void *data)
{
	int error;
	struct inode *inode = new_inode(dir->i_sb);

	if (!inode) {
		error = -EPERM;
		goto bail;
	}

	inode->i_ino = get_next_ino();
	inode->i_mode = mode;
	inode->i_uid = GLOBAL_ROOT_UID;
	inode->i_gid = GLOBAL_ROOT_GID;
	inode->i_blocks = 0;
	inode->i_atime = current_time(inode);
	inode->i_mtime = inode->i_atime;
	inode->i_ctime = inode->i_atime;
	inode->i_private = data;
	if (S_ISDIR(mode)) {
		inode->i_op = &simple_dir_inode_operations;
		inc_nlink(inode);
		inc_nlink(dir);
	}

	inode->i_fop = fops;

	d_instantiate(dentry, inode);
	error = 0;

bail:
	return error;
}

static int create_file(const char *name, umode_t mode,
		       struct dentry *parent, struct dentry **dentry,
		       const struct file_operations *fops, void *data)
{
	int error;

	inode_lock(d_inode(parent));
	*dentry = lookup_one_len(name, parent, strlen(name));
	if (!IS_ERR(*dentry))
		error = qibfs_mknod(d_inode(parent), *dentry,
				    mode, fops, data);
	else
		error = PTR_ERR(*dentry);
	inode_unlock(d_inode(parent));

	return error;
}

static ssize_t driver_stats_read(struct file *file, char __user *buf,
				 size_t count, loff_t *ppos)
{
	qib_stats.sps_ints = qib_sps_ints();
	return simple_read_from_buffer(buf, count, ppos, &qib_stats,
				       sizeof(qib_stats));
}

/*
 * driver stats field names, one line per stat, single string.  Used by
 * programs like ipathstats to print the stats in a way which works for
 * different versions of drivers, without changing program source.
 * if qlogic_ib_stats changes, this needs to change.  Names need to be
 * 12 chars or less (w/o newline), for proper display by ipathstats utility.
 */
static const char qib_statnames[] =
	"KernIntr\n"
	"ErrorIntr\n"
	"Tx_Errs\n"
	"Rcv_Errs\n"
	"H/W_Errs\n"
	"NoPIOBufs\n"
	"CtxtsOpen\n"
	"RcvLen_Errs\n"
	"EgrBufFull\n"
	"EgrHdrFull\n"
	;

static ssize_t driver_names_read(struct file *file, char __user *buf,
				 size_t count, loff_t *ppos)
{
	return simple_read_from_buffer(buf, count, ppos, qib_statnames,
		sizeof(qib_statnames) - 1); /* no null */
}

static const struct file_operations driver_ops[] = {
	{ .read = driver_stats_read, .llseek = generic_file_llseek, },
	{ .read = driver_names_read, .llseek = generic_file_llseek, },
};

/* read the per-device counters */
static ssize_t dev_counters_read(struct file *file, char __user *buf,
				 size_t count, loff_t *ppos)
{
	u64 *counters;
	size_t avail;
	struct qib_devdata *dd = private2dd(file);

	avail = dd->f_read_cntrs(dd, *ppos, NULL, &counters);
	return simple_read_from_buffer(buf, count, ppos, counters, avail);
}

/* read the per-device counters */
static ssize_t dev_names_read(struct file *file, char __user *buf,
			      size_t count, loff_t *ppos)
{
	char *names;
	size_t avail;
	struct qib_devdata *dd = private2dd(file);

	avail = dd->f_read_cntrs(dd, *ppos, &names, NULL);
	return simple_read_from_buffer(buf, count, ppos, names, avail);
}

static const struct file_operations cntr_ops[] = {
	{ .read = dev_counters_read, .llseek = generic_file_llseek, },
	{ .read = dev_names_read, .llseek = generic_file_llseek, },
};

/*
 * Could use file_inode(file)->i_ino to figure out which file,
 * instead of separate routine for each, but for now, this works...
 */

/* read the per-port names (same for each port) */
static ssize_t portnames_read(struct file *file, char __user *buf,
			      size_t count, loff_t *ppos)
{
	char *names;
	size_t avail;
	struct qib_devdata *dd = private2dd(file);

	avail = dd->f_read_portcntrs(dd, *ppos, 0, &names, NULL);
	return simple_read_from_buffer(buf, count, ppos, names, avail);
}

/* read the per-port counters for port 1 (pidx 0) */
static ssize_t portcntrs_1_read(struct file *file, char __user *buf,
				size_t count, loff_t *ppos)
{
	u64 *counters;
	size_t avail;
	struct qib_devdata *dd = private2dd(file);

	avail = dd->f_read_portcntrs(dd, *ppos, 0, NULL, &counters);
	return simple_read_from_buffer(buf, count, ppos, counters, avail);
}

/* read the per-port counters for port 2 (pidx 1) */
static ssize_t portcntrs_2_read(struct file *file, char __user *buf,
				size_t count, loff_t *ppos)
{
	u64 *counters;
	size_t avail;
	struct qib_devdata *dd = private2dd(file);

	avail = dd->f_read_portcntrs(dd, *ppos, 1, NULL, &counters);
	return simple_read_from_buffer(buf, count, ppos, counters, avail);
}

static const struct file_operations portcntr_ops[] = {
	{ .read = portnames_read, .llseek = generic_file_llseek, },
	{ .read = portcntrs_1_read, .llseek = generic_file_llseek, },
	{ .read = portcntrs_2_read, .llseek = generic_file_llseek, },
};

/*
 * read the per-port QSFP data for port 1 (pidx 0)
 */
static ssize_t qsfp_1_read(struct file *file, char __user *buf,
			   size_t count, loff_t *ppos)
{
	struct qib_devdata *dd = private2dd(file);
	char *tmp;
	int ret;

	tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!tmp)
		return -ENOMEM;

	ret = qib_qsfp_dump(dd->pport, tmp, PAGE_SIZE);
	if (ret > 0)
		ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
	kfree(tmp);
	return ret;
}

/*
 * read the per-port QSFP data for port 2 (pidx 1)
 */
static ssize_t qsfp_2_read(struct file *file, char __user *buf,
			   size_t count, loff_t *ppos)
{
	struct qib_devdata *dd = private2dd(file);
	char *tmp;
	int ret;

	if (dd->num_pports < 2)
		return -ENODEV;

	tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!tmp)
		return -ENOMEM;

	ret = qib_qsfp_dump(dd->pport + 1, tmp, PAGE_SIZE);
	if (ret > 0)
		ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
	kfree(tmp);
	return ret;
}

static const struct file_operations qsfp_ops[] = {
	{ .read = qsfp_1_read, .llseek = generic_file_llseek, },
	{ .read = qsfp_2_read, .llseek = generic_file_llseek, },
};

static ssize_t flash_read(struct file *file, char __user *buf,
			  size_t count, loff_t *ppos)
{
	struct qib_devdata *dd;
	ssize_t ret;
	loff_t pos;
	char *tmp;

	pos = *ppos;

	if (pos < 0) {
		ret = -EINVAL;
		goto bail;
	}

	if (pos >= sizeof(struct qib_flash)) {
		ret = 0;
		goto bail;
	}

	if (count > sizeof(struct qib_flash) - pos)
		count = sizeof(struct qib_flash) - pos;

	tmp = kmalloc(count, GFP_KERNEL);
	if (!tmp) {
		ret = -ENOMEM;
		goto bail;
	}

	dd = private2dd(file);
	if (qib_eeprom_read(dd, pos, tmp, count)) {
		qib_dev_err(dd, "failed to read from flash\n");
		ret = -ENXIO;
		goto bail_tmp;
	}

	if (copy_to_user(buf, tmp, count)) {
		ret = -EFAULT;
		goto bail_tmp;
	}

	*ppos = pos + count;
	ret = count;

bail_tmp:
	kfree(tmp);

bail:
	return ret;
}

static ssize_t flash_write(struct file *file, const char __user *buf,
			   size_t count, loff_t *ppos)
{
	struct qib_devdata *dd;
	ssize_t ret;
	loff_t pos;
	char *tmp;

	pos = *ppos;

	if (pos != 0 || count != sizeof(struct qib_flash))
		return -EINVAL;

	tmp = memdup_user(buf, count);
	if (IS_ERR(tmp))
		return PTR_ERR(tmp);

	dd = private2dd(file);
	if (qib_eeprom_write(dd, pos, tmp, count)) {
		ret = -ENXIO;
		qib_dev_err(dd, "failed to write to flash\n");
		goto bail_tmp;
	}

	*ppos = pos + count;
	ret = count;

bail_tmp:
	kfree(tmp);
	return ret;
}

static const struct file_operations flash_ops = {
	.read = flash_read,
	.write = flash_write,
	.llseek = default_llseek,
};

static int add_cntr_files(struct super_block *sb, struct qib_devdata *dd)
{
	struct dentry *dir, *tmp;
	char unit[10];
	int ret, i;

	/* create the per-unit directory */
	snprintf(unit, sizeof(unit), "%u", dd->unit);
	ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
			  &simple_dir_operations, dd);
	if (ret) {
		pr_err("create_file(%s) failed: %d\n", unit, ret);
		goto bail;
	}

	/* create the files in the new directory */
	ret = create_file("counters", S_IFREG|S_IRUGO, dir, &tmp,
			  &cntr_ops[0], dd);
	if (ret) {
		pr_err("create_file(%s/counters) failed: %d\n",
		       unit, ret);
		goto bail;
	}
	ret = create_file("counter_names", S_IFREG|S_IRUGO, dir, &tmp,
			  &cntr_ops[1], dd);
	if (ret) {
		pr_err("create_file(%s/counter_names) failed: %d\n",
		       unit, ret);
		goto bail;
	}
	ret = create_file("portcounter_names", S_IFREG|S_IRUGO, dir, &tmp,
			  &portcntr_ops[0], dd);
	if (ret) {
		pr_err("create_file(%s/%s) failed: %d\n",
		       unit, "portcounter_names", ret);
		goto bail;
	}
	for (i = 1; i <= dd->num_pports; i++) {
		char fname[24];

		sprintf(fname, "port%dcounters", i);
		/* create the files in the new directory */
		ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
				  &portcntr_ops[i], dd);
		if (ret) {
			pr_err("create_file(%s/%s) failed: %d\n",
				unit, fname, ret);
			goto bail;
		}
		if (!(dd->flags & QIB_HAS_QSFP))
			continue;
		sprintf(fname, "qsfp%d", i);
		ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
				  &qsfp_ops[i - 1], dd);
		if (ret) {
			pr_err("create_file(%s/%s) failed: %d\n",
				unit, fname, ret);
			goto bail;
		}
	}

	ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
			  &flash_ops, dd);
	if (ret)
		pr_err("create_file(%s/flash) failed: %d\n",
			unit, ret);
bail:
	return ret;
}

static int remove_file(struct dentry *parent, char *name)
{
	struct dentry *tmp;
	int ret;

	tmp = lookup_one_len(name, parent, strlen(name));

	if (IS_ERR(tmp)) {
		ret = PTR_ERR(tmp);
		goto bail;
	}

	spin_lock(&tmp->d_lock);
	if (simple_positive(tmp)) {
		__d_drop(tmp);
		spin_unlock(&tmp->d_lock);
		simple_unlink(d_inode(parent), tmp);
	} else {
		spin_unlock(&tmp->d_lock);
	}
	dput(tmp);

	ret = 0;
bail:
	/*
	 * We don't expect clients to care about the return value, but
	 * it's there if they need it.
	 */
	return ret;
}

static int remove_device_files(struct super_block *sb,
			       struct qib_devdata *dd)
{
	struct dentry *dir, *root;
	char unit[10];
	int ret, i;

	root = dget(sb->s_root);
	inode_lock(d_inode(root));
	snprintf(unit, sizeof(unit), "%u", dd->unit);
	dir = lookup_one_len(unit, root, strlen(unit));

	if (IS_ERR(dir)) {
		ret = PTR_ERR(dir);
		pr_err("Lookup of %s failed\n", unit);
		goto bail;
	}

	inode_lock(d_inode(dir));
	remove_file(dir, "counters");
	remove_file(dir, "counter_names");
	remove_file(dir, "portcounter_names");
	for (i = 0; i < dd->num_pports; i++) {
		char fname[24];

		sprintf(fname, "port%dcounters", i + 1);
		remove_file(dir, fname);
		if (dd->flags & QIB_HAS_QSFP) {
			sprintf(fname, "qsfp%d", i + 1);
			remove_file(dir, fname);
		}
	}
	remove_file(dir, "flash");
	inode_unlock(d_inode(dir));
	ret = simple_rmdir(d_inode(root), dir);
	d_drop(dir);
	dput(dir);

bail:
	inode_unlock(d_inode(root));
	dput(root);
	return ret;
}

/*
 * This fills everything in when the fs is mounted, to handle umount/mount
 * after device init.  The direct add_cntr_files() call handles adding
 * them from the init code, when the fs is already mounted.
 */
static int qibfs_fill_super(struct super_block *sb, struct fs_context *fc)
{
	struct qib_devdata *dd;
	unsigned long index;
	int ret;

	static const struct tree_descr files[] = {
		[2] = {"driver_stats", &driver_ops[0], S_IRUGO},
		[3] = {"driver_stats_names", &driver_ops[1], S_IRUGO},
		{""},
	};

	ret = simple_fill_super(sb, QIBFS_MAGIC, files);
	if (ret) {
		pr_err("simple_fill_super failed: %d\n", ret);
		goto bail;
	}

	xa_for_each(&qib_dev_table, index, dd) {
		ret = add_cntr_files(sb, dd);
		if (ret)
			goto bail;
	}

bail:
	return ret;
}

static int qibfs_get_tree(struct fs_context *fc)
{
	int ret = get_tree_single(fc, qibfs_fill_super);
	if (ret == 0)
		qib_super = fc->root->d_sb;
	return ret;
}

static const struct fs_context_operations qibfs_context_ops = {
	.get_tree	= qibfs_get_tree,
};

static int qibfs_init_fs_context(struct fs_context *fc)
{
	fc->ops = &qibfs_context_ops;
	return 0;
}

static void qibfs_kill_super(struct super_block *s)
{
	kill_litter_super(s);
	qib_super = NULL;
}

int qibfs_add(struct qib_devdata *dd)
{
	int ret;

	/*
	 * On first unit initialized, qib_super will not yet exist
	 * because nobody has yet tried to mount the filesystem, so
	 * we can't consider that to be an error; if an error occurs
	 * during the mount, that will get a complaint, so this is OK.
	 * add_cntr_files() for all units is done at mount from
	 * qibfs_fill_super(), so one way or another, everything works.
	 */
	if (qib_super == NULL)
		ret = 0;
	else
		ret = add_cntr_files(qib_super, dd);
	return ret;
}

int qibfs_remove(struct qib_devdata *dd)
{
	int ret = 0;

	if (qib_super)
		ret = remove_device_files(qib_super, dd);

	return ret;
}

static struct file_system_type qibfs_fs_type = {
	.owner =        THIS_MODULE,
	.name =         "ipathfs",
	.init_fs_context = qibfs_init_fs_context,
	.kill_sb =      qibfs_kill_super,
};
MODULE_ALIAS_FS("ipathfs");

int __init qib_init_qibfs(void)
{
	return register_filesystem(&qibfs_fs_type);
}

int __exit qib_exit_qibfs(void)
{
	return unregister_filesystem(&qibfs_fs_type);
}