Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
  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
/*
 *    Hypervisor filesystem for Linux on s390. Diag 204 and 224
 *    implementation.
 *
 *    Copyright IBM Corp. 2006, 2008
 *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
 */

#define KMSG_COMPONENT "hypfs"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <asm/diag.h>
#include <asm/ebcdic.h>
#include "hypfs.h"

#define TMP_SIZE 64		/* size of temporary buffers */

#define DBFS_D204_HDR_VERSION	0

static char *diag224_cpu_names;			/* diag 224 name table */
static enum diag204_sc diag204_store_sc;	/* used subcode for store */
static enum diag204_format diag204_info_type;	/* used diag 204 data format */

static void *diag204_buf;		/* 4K aligned buffer for diag204 data */
static void *diag204_buf_vmalloc;	/* vmalloc pointer for diag204 data */
static int diag204_buf_pages;		/* number of pages for diag204 data */

static struct dentry *dbfs_d204_file;

/*
 * DIAG 204 member access functions.
 *
 * Since we have two different diag 204 data formats for old and new s390
 * machines, we do not access the structs directly, but use getter functions for
 * each struct member instead. This should make the code more readable.
 */

/* Time information block */

static inline int info_blk_hdr__size(enum diag204_format type)
{
	if (type == DIAG204_INFO_SIMPLE)
		return sizeof(struct diag204_info_blk_hdr);
	else /* DIAG204_INFO_EXT */
		return sizeof(struct diag204_x_info_blk_hdr);
}

static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return ((struct diag204_info_blk_hdr *)hdr)->npar;
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_info_blk_hdr *)hdr)->npar;
}

static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return ((struct diag204_info_blk_hdr *)hdr)->flags;
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_info_blk_hdr *)hdr)->flags;
}

static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return ((struct diag204_info_blk_hdr *)hdr)->phys_cpus;
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_info_blk_hdr *)hdr)->phys_cpus;
}

/* Partition header */

static inline int part_hdr__size(enum diag204_format type)
{
	if (type == DIAG204_INFO_SIMPLE)
		return sizeof(struct diag204_part_hdr);
	else /* DIAG204_INFO_EXT */
		return sizeof(struct diag204_x_part_hdr);
}

static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return ((struct diag204_part_hdr *)hdr)->cpus;
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_part_hdr *)hdr)->rcpus;
}

static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
				       char *name)
{
	if (type == DIAG204_INFO_SIMPLE)
		memcpy(name, ((struct diag204_part_hdr *)hdr)->part_name,
		       DIAG204_LPAR_NAME_LEN);
	else /* DIAG204_INFO_EXT */
		memcpy(name, ((struct diag204_x_part_hdr *)hdr)->part_name,
		       DIAG204_LPAR_NAME_LEN);
	EBCASC(name, DIAG204_LPAR_NAME_LEN);
	name[DIAG204_LPAR_NAME_LEN] = 0;
	strim(name);
}

/* CPU info block */

static inline int cpu_info__size(enum diag204_format type)
{
	if (type == DIAG204_INFO_SIMPLE)
		return sizeof(struct diag204_cpu_info);
	else /* DIAG204_INFO_EXT */
		return sizeof(struct diag204_x_cpu_info);
}

static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return ((struct diag204_cpu_info *)hdr)->ctidx;
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_cpu_info *)hdr)->ctidx;
}

static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return ((struct diag204_cpu_info *)hdr)->cpu_addr;
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_cpu_info *)hdr)->cpu_addr;
}

static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return ((struct diag204_cpu_info *)hdr)->acc_time;
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_cpu_info *)hdr)->acc_time;
}

static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return ((struct diag204_cpu_info *)hdr)->lp_time;
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_cpu_info *)hdr)->lp_time;
}

static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return 0;	/* online_time not available in simple info */
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_cpu_info *)hdr)->online_time;
}

/* Physical header */

static inline int phys_hdr__size(enum diag204_format type)
{
	if (type == DIAG204_INFO_SIMPLE)
		return sizeof(struct diag204_phys_hdr);
	else /* DIAG204_INFO_EXT */
		return sizeof(struct diag204_x_phys_hdr);
}

static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return ((struct diag204_phys_hdr *)hdr)->cpus;
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_phys_hdr *)hdr)->cpus;
}

/* Physical CPU info block */

static inline int phys_cpu__size(enum diag204_format type)
{
	if (type == DIAG204_INFO_SIMPLE)
		return sizeof(struct diag204_phys_cpu);
	else /* DIAG204_INFO_EXT */
		return sizeof(struct diag204_x_phys_cpu);
}

static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return ((struct diag204_phys_cpu *)hdr)->cpu_addr;
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_phys_cpu *)hdr)->cpu_addr;
}

static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return ((struct diag204_phys_cpu *)hdr)->mgm_time;
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_phys_cpu *)hdr)->mgm_time;
}

static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
{
	if (type == DIAG204_INFO_SIMPLE)
		return ((struct diag204_phys_cpu *)hdr)->ctidx;
	else /* DIAG204_INFO_EXT */
		return ((struct diag204_x_phys_cpu *)hdr)->ctidx;
}

/* Diagnose 204 functions */
/*
 * For the old diag subcode 4 with simple data format we have to use real
 * memory. If we use subcode 6 or 7 with extended data format, we can (and
 * should) use vmalloc, since we need a lot of memory in that case. Currently
 * up to 93 pages!
 */

static void diag204_free_buffer(void)
{
	if (!diag204_buf)
		return;
	if (diag204_buf_vmalloc) {
		vfree(diag204_buf_vmalloc);
		diag204_buf_vmalloc = NULL;
	} else {
		free_pages((unsigned long) diag204_buf, 0);
	}
	diag204_buf = NULL;
}

static void *page_align_ptr(void *ptr)
{
	return (void *) PAGE_ALIGN((unsigned long) ptr);
}

static void *diag204_alloc_vbuf(int pages)
{
	/* The buffer has to be page aligned! */
	diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1));
	if (!diag204_buf_vmalloc)
		return ERR_PTR(-ENOMEM);
	diag204_buf = page_align_ptr(diag204_buf_vmalloc);
	diag204_buf_pages = pages;
	return diag204_buf;
}

static void *diag204_alloc_rbuf(void)
{
	diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
	if (!diag204_buf)
		return ERR_PTR(-ENOMEM);
	diag204_buf_pages = 1;
	return diag204_buf;
}

static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
{
	if (diag204_buf) {
		*pages = diag204_buf_pages;
		return diag204_buf;
	}
	if (fmt == DIAG204_INFO_SIMPLE) {
		*pages = 1;
		return diag204_alloc_rbuf();
	} else {/* DIAG204_INFO_EXT */
		*pages = diag204((unsigned long)DIAG204_SUBC_RSI |
				 (unsigned long)DIAG204_INFO_EXT, 0, NULL);
		if (*pages <= 0)
			return ERR_PTR(-ENOSYS);
		else
			return diag204_alloc_vbuf(*pages);
	}
}

/*
 * diag204_probe() has to find out, which type of diagnose 204 implementation
 * we have on our machine. Currently there are three possible scanarios:
 *   - subcode 4   + simple data format (only one page)
 *   - subcode 4-6 + extended data format
 *   - subcode 4-7 + extended data format
 *
 * Subcode 5 is used to retrieve the size of the data, provided by subcodes
 * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
 * to subcode 6 it provides also information about secondary cpus.
 * In order to get as much information as possible, we first try
 * subcode 7, then 6 and if both fail, we use subcode 4.
 */

static int diag204_probe(void)
{
	void *buf;
	int pages, rc;

	buf = diag204_get_buffer(DIAG204_INFO_EXT, &pages);
	if (!IS_ERR(buf)) {
		if (diag204((unsigned long)DIAG204_SUBC_STIB7 |
			    (unsigned long)DIAG204_INFO_EXT, pages, buf) >= 0) {
			diag204_store_sc = DIAG204_SUBC_STIB7;
			diag204_info_type = DIAG204_INFO_EXT;
			goto out;
		}
		if (diag204((unsigned long)DIAG204_SUBC_STIB6 |
			    (unsigned long)DIAG204_INFO_EXT, pages, buf) >= 0) {
			diag204_store_sc = DIAG204_SUBC_STIB6;
			diag204_info_type = DIAG204_INFO_EXT;
			goto out;
		}
		diag204_free_buffer();
	}

	/* subcodes 6 and 7 failed, now try subcode 4 */

	buf = diag204_get_buffer(DIAG204_INFO_SIMPLE, &pages);
	if (IS_ERR(buf)) {
		rc = PTR_ERR(buf);
		goto fail_alloc;
	}
	if (diag204((unsigned long)DIAG204_SUBC_STIB4 |
		    (unsigned long)DIAG204_INFO_SIMPLE, pages, buf) >= 0) {
		diag204_store_sc = DIAG204_SUBC_STIB4;
		diag204_info_type = DIAG204_INFO_SIMPLE;
		goto out;
	} else {
		rc = -ENOSYS;
		goto fail_store;
	}
out:
	rc = 0;
fail_store:
	diag204_free_buffer();
fail_alloc:
	return rc;
}

static int diag204_do_store(void *buf, int pages)
{
	int rc;

	rc = diag204((unsigned long) diag204_store_sc |
		     (unsigned long) diag204_info_type, pages, buf);
	return rc < 0 ? -ENOSYS : 0;
}

static void *diag204_store(void)
{
	void *buf;
	int pages, rc;

	buf = diag204_get_buffer(diag204_info_type, &pages);
	if (IS_ERR(buf))
		goto out;
	rc = diag204_do_store(buf, pages);
	if (rc)
		return ERR_PTR(rc);
out:
	return buf;
}

/* Diagnose 224 functions */

static int diag224_get_name_table(void)
{
	/* memory must be below 2GB */
	diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
	if (!diag224_cpu_names)
		return -ENOMEM;
	if (diag224(diag224_cpu_names)) {
		kfree(diag224_cpu_names);
		return -EOPNOTSUPP;
	}
	EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
	return 0;
}

static void diag224_delete_name_table(void)
{
	kfree(diag224_cpu_names);
}

static int diag224_idx2name(int index, char *name)
{
	memcpy(name, diag224_cpu_names + ((index + 1) * DIAG204_CPU_NAME_LEN),
	       DIAG204_CPU_NAME_LEN);
	name[DIAG204_CPU_NAME_LEN] = 0;
	strim(name);
	return 0;
}

struct dbfs_d204_hdr {
	u64	len;		/* Length of d204 buffer without header */
	u16	version;	/* Version of header */
	u8	sc;		/* Used subcode */
	char	reserved[53];
} __attribute__ ((packed));

struct dbfs_d204 {
	struct dbfs_d204_hdr	hdr;	/* 64 byte header */
	char			buf[];	/* d204 buffer */
} __attribute__ ((packed));

static int dbfs_d204_create(void **data, void **data_free_ptr, size_t *size)
{
	struct dbfs_d204 *d204;
	int rc, buf_size;
	void *base;

	buf_size = PAGE_SIZE * (diag204_buf_pages + 1) + sizeof(d204->hdr);
	base = vzalloc(buf_size);
	if (!base)
		return -ENOMEM;
	d204 = page_align_ptr(base + sizeof(d204->hdr)) - sizeof(d204->hdr);
	rc = diag204_do_store(d204->buf, diag204_buf_pages);
	if (rc) {
		vfree(base);
		return rc;
	}
	d204->hdr.version = DBFS_D204_HDR_VERSION;
	d204->hdr.len = PAGE_SIZE * diag204_buf_pages;
	d204->hdr.sc = diag204_store_sc;
	*data = d204;
	*data_free_ptr = base;
	*size = d204->hdr.len + sizeof(struct dbfs_d204_hdr);
	return 0;
}

static struct hypfs_dbfs_file dbfs_file_d204 = {
	.name		= "diag_204",
	.data_create	= dbfs_d204_create,
	.data_free	= vfree,
};

__init int hypfs_diag_init(void)
{
	int rc;

	if (diag204_probe()) {
		pr_err("The hardware system does not support hypfs\n");
		return -ENODATA;
	}
	if (diag204_info_type == DIAG204_INFO_EXT) {
		rc = hypfs_dbfs_create_file(&dbfs_file_d204);
		if (rc)
			return rc;
	}
	if (MACHINE_IS_LPAR) {
		rc = diag224_get_name_table();
		if (rc) {
			pr_err("The hardware system does not provide all "
			       "functions required by hypfs\n");
			debugfs_remove(dbfs_d204_file);
			return rc;
		}
	}
	return 0;
}

void hypfs_diag_exit(void)
{
	debugfs_remove(dbfs_d204_file);
	diag224_delete_name_table();
	diag204_free_buffer();
	hypfs_dbfs_remove_file(&dbfs_file_d204);
}

/*
 * Functions to create the directory structure
 * *******************************************
 */

static int hypfs_create_cpu_files(struct dentry *cpus_dir, void *cpu_info)
{
	struct dentry *cpu_dir;
	char buffer[TMP_SIZE];
	void *rc;

	snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
							    cpu_info));
	cpu_dir = hypfs_mkdir(cpus_dir, buffer);
	rc = hypfs_create_u64(cpu_dir, "mgmtime",
			      cpu_info__acc_time(diag204_info_type, cpu_info) -
			      cpu_info__lp_time(diag204_info_type, cpu_info));
	if (IS_ERR(rc))
		return PTR_ERR(rc);
	rc = hypfs_create_u64(cpu_dir, "cputime",
			      cpu_info__lp_time(diag204_info_type, cpu_info));
	if (IS_ERR(rc))
		return PTR_ERR(rc);
	if (diag204_info_type == DIAG204_INFO_EXT) {
		rc = hypfs_create_u64(cpu_dir, "onlinetime",
				      cpu_info__online_time(diag204_info_type,
							    cpu_info));
		if (IS_ERR(rc))
			return PTR_ERR(rc);
	}
	diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
	rc = hypfs_create_str(cpu_dir, "type", buffer);
	return PTR_RET(rc);
}

static void *hypfs_create_lpar_files(struct dentry *systems_dir, void *part_hdr)
{
	struct dentry *cpus_dir;
	struct dentry *lpar_dir;
	char lpar_name[DIAG204_LPAR_NAME_LEN + 1];
	void *cpu_info;
	int i;

	part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
	lpar_name[DIAG204_LPAR_NAME_LEN] = 0;
	lpar_dir = hypfs_mkdir(systems_dir, lpar_name);
	if (IS_ERR(lpar_dir))
		return lpar_dir;
	cpus_dir = hypfs_mkdir(lpar_dir, "cpus");
	if (IS_ERR(cpus_dir))
		return cpus_dir;
	cpu_info = part_hdr + part_hdr__size(diag204_info_type);
	for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
		int rc;
		rc = hypfs_create_cpu_files(cpus_dir, cpu_info);
		if (rc)
			return ERR_PTR(rc);
		cpu_info += cpu_info__size(diag204_info_type);
	}
	return cpu_info;
}

static int hypfs_create_phys_cpu_files(struct dentry *cpus_dir, void *cpu_info)
{
	struct dentry *cpu_dir;
	char buffer[TMP_SIZE];
	void *rc;

	snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
							    cpu_info));
	cpu_dir = hypfs_mkdir(cpus_dir, buffer);
	if (IS_ERR(cpu_dir))
		return PTR_ERR(cpu_dir);
	rc = hypfs_create_u64(cpu_dir, "mgmtime",
			      phys_cpu__mgm_time(diag204_info_type, cpu_info));
	if (IS_ERR(rc))
		return PTR_ERR(rc);
	diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
	rc = hypfs_create_str(cpu_dir, "type", buffer);
	return PTR_RET(rc);
}

static void *hypfs_create_phys_files(struct dentry *parent_dir, void *phys_hdr)
{
	int i;
	void *cpu_info;
	struct dentry *cpus_dir;

	cpus_dir = hypfs_mkdir(parent_dir, "cpus");
	if (IS_ERR(cpus_dir))
		return cpus_dir;
	cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
	for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
		int rc;
		rc = hypfs_create_phys_cpu_files(cpus_dir, cpu_info);
		if (rc)
			return ERR_PTR(rc);
		cpu_info += phys_cpu__size(diag204_info_type);
	}
	return cpu_info;
}

int hypfs_diag_create_files(struct dentry *root)
{
	struct dentry *systems_dir, *hyp_dir;
	void *time_hdr, *part_hdr;
	int i, rc;
	void *buffer, *ptr;

	buffer = diag204_store();
	if (IS_ERR(buffer))
		return PTR_ERR(buffer);

	systems_dir = hypfs_mkdir(root, "systems");
	if (IS_ERR(systems_dir)) {
		rc = PTR_ERR(systems_dir);
		goto err_out;
	}
	time_hdr = (struct x_info_blk_hdr *)buffer;
	part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
	for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
		part_hdr = hypfs_create_lpar_files(systems_dir, part_hdr);
		if (IS_ERR(part_hdr)) {
			rc = PTR_ERR(part_hdr);
			goto err_out;
		}
	}
	if (info_blk_hdr__flags(diag204_info_type, time_hdr) &
	    DIAG204_LPAR_PHYS_FLG) {
		ptr = hypfs_create_phys_files(root, part_hdr);
		if (IS_ERR(ptr)) {
			rc = PTR_ERR(ptr);
			goto err_out;
		}
	}
	hyp_dir = hypfs_mkdir(root, "hyp");
	if (IS_ERR(hyp_dir)) {
		rc = PTR_ERR(hyp_dir);
		goto err_out;
	}
	ptr = hypfs_create_str(hyp_dir, "type", "LPAR Hypervisor");
	if (IS_ERR(ptr)) {
		rc = PTR_ERR(ptr);
		goto err_out;
	}
	rc = 0;

err_out:
	return rc;
}