parisc: add pdc_coproc_cfg_unlocked and set_firmware_width_unlocked
[linux-2.6.git] / arch / s390 / hypfs / hypfs_diag.c
1 /*
2  *  arch/s390/hypfs/hypfs_diag.c
3  *    Hypervisor filesystem for Linux on s390. Diag 204 and 224
4  *    implementation.
5  *
6  *    Copyright (C) IBM Corp. 2006
7  *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
8  */
9
10 #include <linux/types.h>
11 #include <linux/errno.h>
12 #include <linux/string.h>
13 #include <linux/vmalloc.h>
14 #include <asm/ebcdic.h>
15 #include "hypfs.h"
16
17 #define LPAR_NAME_LEN 8         /* lpar name len in diag 204 data */
18 #define CPU_NAME_LEN 16         /* type name len of cpus in diag224 name table */
19 #define TMP_SIZE 64             /* size of temporary buffers */
20
21 /* diag 204 subcodes */
22 enum diag204_sc {
23         SUBC_STIB4 = 4,
24         SUBC_RSI = 5,
25         SUBC_STIB6 = 6,
26         SUBC_STIB7 = 7
27 };
28
29 /* The two available diag 204 data formats */
30 enum diag204_format {
31         INFO_SIMPLE = 0,
32         INFO_EXT = 0x00010000
33 };
34
35 /* bit is set in flags, when physical cpu info is included in diag 204 data */
36 #define LPAR_PHYS_FLG  0x80
37
38 static char *diag224_cpu_names;                 /* diag 224 name table */
39 static enum diag204_sc diag204_store_sc;        /* used subcode for store */
40 static enum diag204_format diag204_info_type;   /* used diag 204 data format */
41
42 static void *diag204_buf;               /* 4K aligned buffer for diag204 data */
43 static void *diag204_buf_vmalloc;       /* vmalloc pointer for diag204 data */
44 static int diag204_buf_pages;           /* number of pages for diag204 data */
45
46 /*
47  * DIAG 204 data structures and member access functions.
48  *
49  * Since we have two different diag 204 data formats for old and new s390
50  * machines, we do not access the structs directly, but use getter functions for
51  * each struct member instead. This should make the code more readable.
52  */
53
54 /* Time information block */
55
56 struct info_blk_hdr {
57         __u8  npar;
58         __u8  flags;
59         __u16 tslice;
60         __u16 phys_cpus;
61         __u16 this_part;
62         __u64 curtod;
63 } __attribute__ ((packed));
64
65 struct x_info_blk_hdr {
66         __u8  npar;
67         __u8  flags;
68         __u16 tslice;
69         __u16 phys_cpus;
70         __u16 this_part;
71         __u64 curtod1;
72         __u64 curtod2;
73         char reserved[40];
74 } __attribute__ ((packed));
75
76 static inline int info_blk_hdr__size(enum diag204_format type)
77 {
78         if (type == INFO_SIMPLE)
79                 return sizeof(struct info_blk_hdr);
80         else /* INFO_EXT */
81                 return sizeof(struct x_info_blk_hdr);
82 }
83
84 static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
85 {
86         if (type == INFO_SIMPLE)
87                 return ((struct info_blk_hdr *)hdr)->npar;
88         else /* INFO_EXT */
89                 return ((struct x_info_blk_hdr *)hdr)->npar;
90 }
91
92 static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
93 {
94         if (type == INFO_SIMPLE)
95                 return ((struct info_blk_hdr *)hdr)->flags;
96         else /* INFO_EXT */
97                 return ((struct x_info_blk_hdr *)hdr)->flags;
98 }
99
100 static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
101 {
102         if (type == INFO_SIMPLE)
103                 return ((struct info_blk_hdr *)hdr)->phys_cpus;
104         else /* INFO_EXT */
105                 return ((struct x_info_blk_hdr *)hdr)->phys_cpus;
106 }
107
108 /* Partition header */
109
110 struct part_hdr {
111         __u8 pn;
112         __u8 cpus;
113         char reserved[6];
114         char part_name[LPAR_NAME_LEN];
115 } __attribute__ ((packed));
116
117 struct x_part_hdr {
118         __u8  pn;
119         __u8  cpus;
120         __u8  rcpus;
121         __u8  pflag;
122         __u32 mlu;
123         char  part_name[LPAR_NAME_LEN];
124         char  lpc_name[8];
125         char  os_name[8];
126         __u64 online_cs;
127         __u64 online_es;
128         __u8  upid;
129         char  reserved1[3];
130         __u32 group_mlu;
131         char  group_name[8];
132         char  reserved2[32];
133 } __attribute__ ((packed));
134
135 static inline int part_hdr__size(enum diag204_format type)
136 {
137         if (type == INFO_SIMPLE)
138                 return sizeof(struct part_hdr);
139         else /* INFO_EXT */
140                 return sizeof(struct x_part_hdr);
141 }
142
143 static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
144 {
145         if (type == INFO_SIMPLE)
146                 return ((struct part_hdr *)hdr)->cpus;
147         else /* INFO_EXT */
148                 return ((struct x_part_hdr *)hdr)->rcpus;
149 }
150
151 static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
152                                        char *name)
153 {
154         if (type == INFO_SIMPLE)
155                 memcpy(name, ((struct part_hdr *)hdr)->part_name,
156                        LPAR_NAME_LEN);
157         else /* INFO_EXT */
158                 memcpy(name, ((struct x_part_hdr *)hdr)->part_name,
159                        LPAR_NAME_LEN);
160         EBCASC(name, LPAR_NAME_LEN);
161         name[LPAR_NAME_LEN] = 0;
162         strstrip(name);
163 }
164
165 struct cpu_info {
166         __u16 cpu_addr;
167         char  reserved1[2];
168         __u8  ctidx;
169         __u8  cflag;
170         __u16 weight;
171         __u64 acc_time;
172         __u64 lp_time;
173 } __attribute__ ((packed));
174
175 struct x_cpu_info {
176         __u16 cpu_addr;
177         char  reserved1[2];
178         __u8  ctidx;
179         __u8  cflag;
180         __u16 weight;
181         __u64 acc_time;
182         __u64 lp_time;
183         __u16 min_weight;
184         __u16 cur_weight;
185         __u16 max_weight;
186         char  reseved2[2];
187         __u64 online_time;
188         __u64 wait_time;
189         __u32 pma_weight;
190         __u32 polar_weight;
191         char  reserved3[40];
192 } __attribute__ ((packed));
193
194 /* CPU info block */
195
196 static inline int cpu_info__size(enum diag204_format type)
197 {
198         if (type == INFO_SIMPLE)
199                 return sizeof(struct cpu_info);
200         else /* INFO_EXT */
201                 return sizeof(struct x_cpu_info);
202 }
203
204 static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
205 {
206         if (type == INFO_SIMPLE)
207                 return ((struct cpu_info *)hdr)->ctidx;
208         else /* INFO_EXT */
209                 return ((struct x_cpu_info *)hdr)->ctidx;
210 }
211
212 static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
213 {
214         if (type == INFO_SIMPLE)
215                 return ((struct cpu_info *)hdr)->cpu_addr;
216         else /* INFO_EXT */
217                 return ((struct x_cpu_info *)hdr)->cpu_addr;
218 }
219
220 static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
221 {
222         if (type == INFO_SIMPLE)
223                 return ((struct cpu_info *)hdr)->acc_time;
224         else /* INFO_EXT */
225                 return ((struct x_cpu_info *)hdr)->acc_time;
226 }
227
228 static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
229 {
230         if (type == INFO_SIMPLE)
231                 return ((struct cpu_info *)hdr)->lp_time;
232         else /* INFO_EXT */
233                 return ((struct x_cpu_info *)hdr)->lp_time;
234 }
235
236 static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
237 {
238         if (type == INFO_SIMPLE)
239                 return 0;       /* online_time not available in simple info */
240         else /* INFO_EXT */
241                 return ((struct x_cpu_info *)hdr)->online_time;
242 }
243
244 /* Physical header */
245
246 struct phys_hdr {
247         char reserved1[1];
248         __u8 cpus;
249         char reserved2[6];
250         char mgm_name[8];
251 } __attribute__ ((packed));
252
253 struct x_phys_hdr {
254         char reserved1[1];
255         __u8 cpus;
256         char reserved2[6];
257         char mgm_name[8];
258         char reserved3[80];
259 } __attribute__ ((packed));
260
261 static inline int phys_hdr__size(enum diag204_format type)
262 {
263         if (type == INFO_SIMPLE)
264                 return sizeof(struct phys_hdr);
265         else /* INFO_EXT */
266                 return sizeof(struct x_phys_hdr);
267 }
268
269 static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
270 {
271         if (type == INFO_SIMPLE)
272                 return ((struct phys_hdr *)hdr)->cpus;
273         else /* INFO_EXT */
274                 return ((struct x_phys_hdr *)hdr)->cpus;
275 }
276
277 /* Physical CPU info block */
278
279 struct phys_cpu {
280         __u16 cpu_addr;
281         char  reserved1[2];
282         __u8  ctidx;
283         char  reserved2[3];
284         __u64 mgm_time;
285         char  reserved3[8];
286 } __attribute__ ((packed));
287
288 struct x_phys_cpu {
289         __u16 cpu_addr;
290         char  reserved1[2];
291         __u8  ctidx;
292         char  reserved2[3];
293         __u64 mgm_time;
294         char  reserved3[80];
295 } __attribute__ ((packed));
296
297 static inline int phys_cpu__size(enum diag204_format type)
298 {
299         if (type == INFO_SIMPLE)
300                 return sizeof(struct phys_cpu);
301         else /* INFO_EXT */
302                 return sizeof(struct x_phys_cpu);
303 }
304
305 static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
306 {
307         if (type == INFO_SIMPLE)
308                 return ((struct phys_cpu *)hdr)->cpu_addr;
309         else /* INFO_EXT */
310                 return ((struct x_phys_cpu *)hdr)->cpu_addr;
311 }
312
313 static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
314 {
315         if (type == INFO_SIMPLE)
316                 return ((struct phys_cpu *)hdr)->mgm_time;
317         else /* INFO_EXT */
318                 return ((struct x_phys_cpu *)hdr)->mgm_time;
319 }
320
321 static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
322 {
323         if (type == INFO_SIMPLE)
324                 return ((struct phys_cpu *)hdr)->ctidx;
325         else /* INFO_EXT */
326                 return ((struct x_phys_cpu *)hdr)->ctidx;
327 }
328
329 /* Diagnose 204 functions */
330
331 static int diag204(unsigned long subcode, unsigned long size, void *addr)
332 {
333         register unsigned long _subcode asm("0") = subcode;
334         register unsigned long _size asm("1") = size;
335
336         asm volatile(
337                 "       diag    %2,%0,0x204\n"
338                 "0:\n"
339                 EX_TABLE(0b,0b)
340                 : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory");
341         if (_subcode)
342                 return -1;
343         return _size;
344 }
345
346 /*
347  * For the old diag subcode 4 with simple data format we have to use real
348  * memory. If we use subcode 6 or 7 with extended data format, we can (and
349  * should) use vmalloc, since we need a lot of memory in that case. Currently
350  * up to 93 pages!
351  */
352
353 static void diag204_free_buffer(void)
354 {
355         if (!diag204_buf)
356                 return;
357         if (diag204_buf_vmalloc) {
358                 vfree(diag204_buf_vmalloc);
359                 diag204_buf_vmalloc = NULL;
360         } else {
361                 free_pages((unsigned long) diag204_buf, 0);
362         }
363         diag204_buf_pages = 0;
364         diag204_buf = NULL;
365 }
366
367 static void *diag204_alloc_vbuf(int pages)
368 {
369         /* The buffer has to be page aligned! */
370         diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1));
371         if (!diag204_buf_vmalloc)
372                 return ERR_PTR(-ENOMEM);
373         diag204_buf = (void*)((unsigned long)diag204_buf_vmalloc
374                                 & ~0xfffUL) + 0x1000;
375         diag204_buf_pages = pages;
376         return diag204_buf;
377 }
378
379 static void *diag204_alloc_rbuf(void)
380 {
381         diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
382         if (!diag204_buf)
383                 return ERR_PTR(-ENOMEM);
384         diag204_buf_pages = 1;
385         return diag204_buf;
386 }
387
388 static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
389 {
390         if (diag204_buf) {
391                 *pages = diag204_buf_pages;
392                 return diag204_buf;
393         }
394         if (fmt == INFO_SIMPLE) {
395                 *pages = 1;
396                 return diag204_alloc_rbuf();
397         } else {/* INFO_EXT */
398                 *pages = diag204((unsigned long)SUBC_RSI |
399                                  (unsigned long)INFO_EXT, 0, NULL);
400                 if (*pages <= 0)
401                         return ERR_PTR(-ENOSYS);
402                 else
403                         return diag204_alloc_vbuf(*pages);
404         }
405 }
406
407 /*
408  * diag204_probe() has to find out, which type of diagnose 204 implementation
409  * we have on our machine. Currently there are three possible scanarios:
410  *   - subcode 4   + simple data format (only one page)
411  *   - subcode 4-6 + extended data format
412  *   - subcode 4-7 + extended data format
413  *
414  * Subcode 5 is used to retrieve the size of the data, provided by subcodes
415  * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
416  * to subcode 6 it provides also information about secondary cpus.
417  * In order to get as much information as possible, we first try
418  * subcode 7, then 6 and if both fail, we use subcode 4.
419  */
420
421 static int diag204_probe(void)
422 {
423         void *buf;
424         int pages, rc;
425
426         buf = diag204_get_buffer(INFO_EXT, &pages);
427         if (!IS_ERR(buf)) {
428                 if (diag204((unsigned long)SUBC_STIB7 |
429                             (unsigned long)INFO_EXT, pages, buf) >= 0) {
430                         diag204_store_sc = SUBC_STIB7;
431                         diag204_info_type = INFO_EXT;
432                         goto out;
433                 }
434                 if (diag204((unsigned long)SUBC_STIB6 |
435                             (unsigned long)INFO_EXT, pages, buf) >= 0) {
436                         diag204_store_sc = SUBC_STIB7;
437                         diag204_info_type = INFO_EXT;
438                         goto out;
439                 }
440                 diag204_free_buffer();
441         }
442
443         /* subcodes 6 and 7 failed, now try subcode 4 */
444
445         buf = diag204_get_buffer(INFO_SIMPLE, &pages);
446         if (IS_ERR(buf)) {
447                 rc = PTR_ERR(buf);
448                 goto fail_alloc;
449         }
450         if (diag204((unsigned long)SUBC_STIB4 |
451                     (unsigned long)INFO_SIMPLE, pages, buf) >= 0) {
452                 diag204_store_sc = SUBC_STIB4;
453                 diag204_info_type = INFO_SIMPLE;
454                 goto out;
455         } else {
456                 rc = -ENOSYS;
457                 goto fail_store;
458         }
459 out:
460         rc = 0;
461 fail_store:
462         diag204_free_buffer();
463 fail_alloc:
464         return rc;
465 }
466
467 static void *diag204_store(void)
468 {
469         void *buf;
470         int pages;
471
472         buf = diag204_get_buffer(diag204_info_type, &pages);
473         if (IS_ERR(buf))
474                 goto out;
475         if (diag204((unsigned long)diag204_store_sc |
476                     (unsigned long)diag204_info_type, pages, buf) < 0)
477                 return ERR_PTR(-ENOSYS);
478 out:
479         return buf;
480 }
481
482 /* Diagnose 224 functions */
483
484 static int diag224(void *ptr)
485 {
486         int rc = -ENOTSUPP;
487
488         asm volatile(
489                 "       diag    %1,%2,0x224\n"
490                 "0:     lhi     %0,0x0\n"
491                 "1:\n"
492                 EX_TABLE(0b,1b)
493                 : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
494         return rc;
495 }
496
497 static int diag224_get_name_table(void)
498 {
499         /* memory must be below 2GB */
500         diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
501         if (!diag224_cpu_names)
502                 return -ENOMEM;
503         if (diag224(diag224_cpu_names)) {
504                 kfree(diag224_cpu_names);
505                 return -ENOTSUPP;
506         }
507         EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
508         return 0;
509 }
510
511 static void diag224_delete_name_table(void)
512 {
513         kfree(diag224_cpu_names);
514 }
515
516 static int diag224_idx2name(int index, char *name)
517 {
518         memcpy(name, diag224_cpu_names + ((index + 1) * CPU_NAME_LEN),
519                 CPU_NAME_LEN);
520         name[CPU_NAME_LEN] = 0;
521         strstrip(name);
522         return 0;
523 }
524
525 __init int hypfs_diag_init(void)
526 {
527         int rc;
528
529         if (diag204_probe()) {
530                 printk(KERN_ERR "hypfs: diag 204 not working.");
531                 return -ENODATA;
532         }
533         rc = diag224_get_name_table();
534         if (rc) {
535                 diag204_free_buffer();
536                 printk(KERN_ERR "hypfs: could not get name table.\n");
537         }
538         return rc;
539 }
540
541 void hypfs_diag_exit(void)
542 {
543         diag224_delete_name_table();
544         diag204_free_buffer();
545 }
546
547 /*
548  * Functions to create the directory structure
549  * *******************************************
550  */
551
552 static int hypfs_create_cpu_files(struct super_block *sb,
553                                   struct dentry *cpus_dir, void *cpu_info)
554 {
555         struct dentry *cpu_dir;
556         char buffer[TMP_SIZE];
557         void *rc;
558
559         snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
560                                                             cpu_info));
561         cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
562         rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
563                               cpu_info__acc_time(diag204_info_type, cpu_info) -
564                               cpu_info__lp_time(diag204_info_type, cpu_info));
565         if (IS_ERR(rc))
566                 return PTR_ERR(rc);
567         rc = hypfs_create_u64(sb, cpu_dir, "cputime",
568                               cpu_info__lp_time(diag204_info_type, cpu_info));
569         if (IS_ERR(rc))
570                 return PTR_ERR(rc);
571         if (diag204_info_type == INFO_EXT) {
572                 rc = hypfs_create_u64(sb, cpu_dir, "onlinetime",
573                                       cpu_info__online_time(diag204_info_type,
574                                                             cpu_info));
575                 if (IS_ERR(rc))
576                         return PTR_ERR(rc);
577         }
578         diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
579         rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
580         if (IS_ERR(rc))
581                 return PTR_ERR(rc);
582         return 0;
583 }
584
585 static void *hypfs_create_lpar_files(struct super_block *sb,
586                                      struct dentry *systems_dir, void *part_hdr)
587 {
588         struct dentry *cpus_dir;
589         struct dentry *lpar_dir;
590         char lpar_name[LPAR_NAME_LEN + 1];
591         void *cpu_info;
592         int i;
593
594         part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
595         lpar_name[LPAR_NAME_LEN] = 0;
596         lpar_dir = hypfs_mkdir(sb, systems_dir, lpar_name);
597         if (IS_ERR(lpar_dir))
598                 return lpar_dir;
599         cpus_dir = hypfs_mkdir(sb, lpar_dir, "cpus");
600         if (IS_ERR(cpus_dir))
601                 return cpus_dir;
602         cpu_info = part_hdr + part_hdr__size(diag204_info_type);
603         for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
604                 int rc;
605                 rc = hypfs_create_cpu_files(sb, cpus_dir, cpu_info);
606                 if (rc)
607                         return ERR_PTR(rc);
608                 cpu_info += cpu_info__size(diag204_info_type);
609         }
610         return cpu_info;
611 }
612
613 static int hypfs_create_phys_cpu_files(struct super_block *sb,
614                                        struct dentry *cpus_dir, void *cpu_info)
615 {
616         struct dentry *cpu_dir;
617         char buffer[TMP_SIZE];
618         void *rc;
619
620         snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
621                                                             cpu_info));
622         cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
623         if (IS_ERR(cpu_dir))
624                 return PTR_ERR(cpu_dir);
625         rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
626                               phys_cpu__mgm_time(diag204_info_type, cpu_info));
627         if (IS_ERR(rc))
628                 return PTR_ERR(rc);
629         diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
630         rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
631         if (IS_ERR(rc))
632                 return PTR_ERR(rc);
633         return 0;
634 }
635
636 static void *hypfs_create_phys_files(struct super_block *sb,
637                                      struct dentry *parent_dir, void *phys_hdr)
638 {
639         int i;
640         void *cpu_info;
641         struct dentry *cpus_dir;
642
643         cpus_dir = hypfs_mkdir(sb, parent_dir, "cpus");
644         if (IS_ERR(cpus_dir))
645                 return cpus_dir;
646         cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
647         for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
648                 int rc;
649                 rc = hypfs_create_phys_cpu_files(sb, cpus_dir, cpu_info);
650                 if (rc)
651                         return ERR_PTR(rc);
652                 cpu_info += phys_cpu__size(diag204_info_type);
653         }
654         return cpu_info;
655 }
656
657 int hypfs_diag_create_files(struct super_block *sb, struct dentry *root)
658 {
659         struct dentry *systems_dir, *hyp_dir;
660         void *time_hdr, *part_hdr;
661         int i, rc;
662         void *buffer, *ptr;
663
664         buffer = diag204_store();
665         if (IS_ERR(buffer))
666                 return PTR_ERR(buffer);
667
668         systems_dir = hypfs_mkdir(sb, root, "systems");
669         if (IS_ERR(systems_dir)) {
670                 rc = PTR_ERR(systems_dir);
671                 goto err_out;
672         }
673         time_hdr = (struct x_info_blk_hdr *)buffer;
674         part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
675         for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
676                 part_hdr = hypfs_create_lpar_files(sb, systems_dir, part_hdr);
677                 if (IS_ERR(part_hdr)) {
678                         rc = PTR_ERR(part_hdr);
679                         goto err_out;
680                 }
681         }
682         if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) {
683                 ptr = hypfs_create_phys_files(sb, root, part_hdr);
684                 if (IS_ERR(ptr)) {
685                         rc = PTR_ERR(ptr);
686                         goto err_out;
687                 }
688         }
689         hyp_dir = hypfs_mkdir(sb, root, "hyp");
690         if (IS_ERR(hyp_dir)) {
691                 rc = PTR_ERR(hyp_dir);
692                 goto err_out;
693         }
694         ptr = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor");
695         if (IS_ERR(ptr)) {
696                 rc = PTR_ERR(ptr);
697                 goto err_out;
698         }
699         rc = 0;
700
701 err_out:
702         return rc;
703 }