Merge branch 'for-2.6.38/drivers' of git://git.kernel.dk/linux-2.6-block
[pandora-kernel.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 IBM Corp. 2006, 2008
7  *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
8  */
9
10 #define KMSG_COMPONENT "hypfs"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
13 #include <linux/types.h>
14 #include <linux/errno.h>
15 #include <linux/slab.h>
16 #include <linux/string.h>
17 #include <linux/vmalloc.h>
18 #include <linux/mm.h>
19 #include <asm/ebcdic.h>
20 #include "hypfs.h"
21
22 #define LPAR_NAME_LEN 8         /* lpar name len in diag 204 data */
23 #define CPU_NAME_LEN 16         /* type name len of cpus in diag224 name table */
24 #define TMP_SIZE 64             /* size of temporary buffers */
25
26 #define DBFS_D204_HDR_VERSION   0
27
28 /* diag 204 subcodes */
29 enum diag204_sc {
30         SUBC_STIB4 = 4,
31         SUBC_RSI = 5,
32         SUBC_STIB6 = 6,
33         SUBC_STIB7 = 7
34 };
35
36 /* The two available diag 204 data formats */
37 enum diag204_format {
38         INFO_SIMPLE = 0,
39         INFO_EXT = 0x00010000
40 };
41
42 /* bit is set in flags, when physical cpu info is included in diag 204 data */
43 #define LPAR_PHYS_FLG  0x80
44
45 static char *diag224_cpu_names;                 /* diag 224 name table */
46 static enum diag204_sc diag204_store_sc;        /* used subcode for store */
47 static enum diag204_format diag204_info_type;   /* used diag 204 data format */
48
49 static void *diag204_buf;               /* 4K aligned buffer for diag204 data */
50 static void *diag204_buf_vmalloc;       /* vmalloc pointer for diag204 data */
51 static int diag204_buf_pages;           /* number of pages for diag204 data */
52
53 static struct dentry *dbfs_d204_file;
54
55 /*
56  * DIAG 204 data structures and member access functions.
57  *
58  * Since we have two different diag 204 data formats for old and new s390
59  * machines, we do not access the structs directly, but use getter functions for
60  * each struct member instead. This should make the code more readable.
61  */
62
63 /* Time information block */
64
65 struct info_blk_hdr {
66         __u8  npar;
67         __u8  flags;
68         __u16 tslice;
69         __u16 phys_cpus;
70         __u16 this_part;
71         __u64 curtod;
72 } __attribute__ ((packed));
73
74 struct x_info_blk_hdr {
75         __u8  npar;
76         __u8  flags;
77         __u16 tslice;
78         __u16 phys_cpus;
79         __u16 this_part;
80         __u64 curtod1;
81         __u64 curtod2;
82         char reserved[40];
83 } __attribute__ ((packed));
84
85 static inline int info_blk_hdr__size(enum diag204_format type)
86 {
87         if (type == INFO_SIMPLE)
88                 return sizeof(struct info_blk_hdr);
89         else /* INFO_EXT */
90                 return sizeof(struct x_info_blk_hdr);
91 }
92
93 static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
94 {
95         if (type == INFO_SIMPLE)
96                 return ((struct info_blk_hdr *)hdr)->npar;
97         else /* INFO_EXT */
98                 return ((struct x_info_blk_hdr *)hdr)->npar;
99 }
100
101 static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
102 {
103         if (type == INFO_SIMPLE)
104                 return ((struct info_blk_hdr *)hdr)->flags;
105         else /* INFO_EXT */
106                 return ((struct x_info_blk_hdr *)hdr)->flags;
107 }
108
109 static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
110 {
111         if (type == INFO_SIMPLE)
112                 return ((struct info_blk_hdr *)hdr)->phys_cpus;
113         else /* INFO_EXT */
114                 return ((struct x_info_blk_hdr *)hdr)->phys_cpus;
115 }
116
117 /* Partition header */
118
119 struct part_hdr {
120         __u8 pn;
121         __u8 cpus;
122         char reserved[6];
123         char part_name[LPAR_NAME_LEN];
124 } __attribute__ ((packed));
125
126 struct x_part_hdr {
127         __u8  pn;
128         __u8  cpus;
129         __u8  rcpus;
130         __u8  pflag;
131         __u32 mlu;
132         char  part_name[LPAR_NAME_LEN];
133         char  lpc_name[8];
134         char  os_name[8];
135         __u64 online_cs;
136         __u64 online_es;
137         __u8  upid;
138         char  reserved1[3];
139         __u32 group_mlu;
140         char  group_name[8];
141         char  reserved2[32];
142 } __attribute__ ((packed));
143
144 static inline int part_hdr__size(enum diag204_format type)
145 {
146         if (type == INFO_SIMPLE)
147                 return sizeof(struct part_hdr);
148         else /* INFO_EXT */
149                 return sizeof(struct x_part_hdr);
150 }
151
152 static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
153 {
154         if (type == INFO_SIMPLE)
155                 return ((struct part_hdr *)hdr)->cpus;
156         else /* INFO_EXT */
157                 return ((struct x_part_hdr *)hdr)->rcpus;
158 }
159
160 static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
161                                        char *name)
162 {
163         if (type == INFO_SIMPLE)
164                 memcpy(name, ((struct part_hdr *)hdr)->part_name,
165                        LPAR_NAME_LEN);
166         else /* INFO_EXT */
167                 memcpy(name, ((struct x_part_hdr *)hdr)->part_name,
168                        LPAR_NAME_LEN);
169         EBCASC(name, LPAR_NAME_LEN);
170         name[LPAR_NAME_LEN] = 0;
171         strim(name);
172 }
173
174 struct cpu_info {
175         __u16 cpu_addr;
176         char  reserved1[2];
177         __u8  ctidx;
178         __u8  cflag;
179         __u16 weight;
180         __u64 acc_time;
181         __u64 lp_time;
182 } __attribute__ ((packed));
183
184 struct x_cpu_info {
185         __u16 cpu_addr;
186         char  reserved1[2];
187         __u8  ctidx;
188         __u8  cflag;
189         __u16 weight;
190         __u64 acc_time;
191         __u64 lp_time;
192         __u16 min_weight;
193         __u16 cur_weight;
194         __u16 max_weight;
195         char  reseved2[2];
196         __u64 online_time;
197         __u64 wait_time;
198         __u32 pma_weight;
199         __u32 polar_weight;
200         char  reserved3[40];
201 } __attribute__ ((packed));
202
203 /* CPU info block */
204
205 static inline int cpu_info__size(enum diag204_format type)
206 {
207         if (type == INFO_SIMPLE)
208                 return sizeof(struct cpu_info);
209         else /* INFO_EXT */
210                 return sizeof(struct x_cpu_info);
211 }
212
213 static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
214 {
215         if (type == INFO_SIMPLE)
216                 return ((struct cpu_info *)hdr)->ctidx;
217         else /* INFO_EXT */
218                 return ((struct x_cpu_info *)hdr)->ctidx;
219 }
220
221 static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
222 {
223         if (type == INFO_SIMPLE)
224                 return ((struct cpu_info *)hdr)->cpu_addr;
225         else /* INFO_EXT */
226                 return ((struct x_cpu_info *)hdr)->cpu_addr;
227 }
228
229 static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
230 {
231         if (type == INFO_SIMPLE)
232                 return ((struct cpu_info *)hdr)->acc_time;
233         else /* INFO_EXT */
234                 return ((struct x_cpu_info *)hdr)->acc_time;
235 }
236
237 static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
238 {
239         if (type == INFO_SIMPLE)
240                 return ((struct cpu_info *)hdr)->lp_time;
241         else /* INFO_EXT */
242                 return ((struct x_cpu_info *)hdr)->lp_time;
243 }
244
245 static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
246 {
247         if (type == INFO_SIMPLE)
248                 return 0;       /* online_time not available in simple info */
249         else /* INFO_EXT */
250                 return ((struct x_cpu_info *)hdr)->online_time;
251 }
252
253 /* Physical header */
254
255 struct phys_hdr {
256         char reserved1[1];
257         __u8 cpus;
258         char reserved2[6];
259         char mgm_name[8];
260 } __attribute__ ((packed));
261
262 struct x_phys_hdr {
263         char reserved1[1];
264         __u8 cpus;
265         char reserved2[6];
266         char mgm_name[8];
267         char reserved3[80];
268 } __attribute__ ((packed));
269
270 static inline int phys_hdr__size(enum diag204_format type)
271 {
272         if (type == INFO_SIMPLE)
273                 return sizeof(struct phys_hdr);
274         else /* INFO_EXT */
275                 return sizeof(struct x_phys_hdr);
276 }
277
278 static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
279 {
280         if (type == INFO_SIMPLE)
281                 return ((struct phys_hdr *)hdr)->cpus;
282         else /* INFO_EXT */
283                 return ((struct x_phys_hdr *)hdr)->cpus;
284 }
285
286 /* Physical CPU info block */
287
288 struct phys_cpu {
289         __u16 cpu_addr;
290         char  reserved1[2];
291         __u8  ctidx;
292         char  reserved2[3];
293         __u64 mgm_time;
294         char  reserved3[8];
295 } __attribute__ ((packed));
296
297 struct x_phys_cpu {
298         __u16 cpu_addr;
299         char  reserved1[2];
300         __u8  ctidx;
301         char  reserved2[3];
302         __u64 mgm_time;
303         char  reserved3[80];
304 } __attribute__ ((packed));
305
306 static inline int phys_cpu__size(enum diag204_format type)
307 {
308         if (type == INFO_SIMPLE)
309                 return sizeof(struct phys_cpu);
310         else /* INFO_EXT */
311                 return sizeof(struct x_phys_cpu);
312 }
313
314 static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
315 {
316         if (type == INFO_SIMPLE)
317                 return ((struct phys_cpu *)hdr)->cpu_addr;
318         else /* INFO_EXT */
319                 return ((struct x_phys_cpu *)hdr)->cpu_addr;
320 }
321
322 static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
323 {
324         if (type == INFO_SIMPLE)
325                 return ((struct phys_cpu *)hdr)->mgm_time;
326         else /* INFO_EXT */
327                 return ((struct x_phys_cpu *)hdr)->mgm_time;
328 }
329
330 static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
331 {
332         if (type == INFO_SIMPLE)
333                 return ((struct phys_cpu *)hdr)->ctidx;
334         else /* INFO_EXT */
335                 return ((struct x_phys_cpu *)hdr)->ctidx;
336 }
337
338 /* Diagnose 204 functions */
339
340 static int diag204(unsigned long subcode, unsigned long size, void *addr)
341 {
342         register unsigned long _subcode asm("0") = subcode;
343         register unsigned long _size asm("1") = size;
344
345         asm volatile(
346                 "       diag    %2,%0,0x204\n"
347                 "0:\n"
348                 EX_TABLE(0b,0b)
349                 : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory");
350         if (_subcode)
351                 return -1;
352         return _size;
353 }
354
355 /*
356  * For the old diag subcode 4 with simple data format we have to use real
357  * memory. If we use subcode 6 or 7 with extended data format, we can (and
358  * should) use vmalloc, since we need a lot of memory in that case. Currently
359  * up to 93 pages!
360  */
361
362 static void diag204_free_buffer(void)
363 {
364         if (!diag204_buf)
365                 return;
366         if (diag204_buf_vmalloc) {
367                 vfree(diag204_buf_vmalloc);
368                 diag204_buf_vmalloc = NULL;
369         } else {
370                 free_pages((unsigned long) diag204_buf, 0);
371         }
372         diag204_buf = NULL;
373 }
374
375 static void *page_align_ptr(void *ptr)
376 {
377         return (void *) PAGE_ALIGN((unsigned long) ptr);
378 }
379
380 static void *diag204_alloc_vbuf(int pages)
381 {
382         /* The buffer has to be page aligned! */
383         diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1));
384         if (!diag204_buf_vmalloc)
385                 return ERR_PTR(-ENOMEM);
386         diag204_buf = page_align_ptr(diag204_buf_vmalloc);
387         diag204_buf_pages = pages;
388         return diag204_buf;
389 }
390
391 static void *diag204_alloc_rbuf(void)
392 {
393         diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
394         if (!diag204_buf)
395                 return ERR_PTR(-ENOMEM);
396         diag204_buf_pages = 1;
397         return diag204_buf;
398 }
399
400 static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
401 {
402         if (diag204_buf) {
403                 *pages = diag204_buf_pages;
404                 return diag204_buf;
405         }
406         if (fmt == INFO_SIMPLE) {
407                 *pages = 1;
408                 return diag204_alloc_rbuf();
409         } else {/* INFO_EXT */
410                 *pages = diag204((unsigned long)SUBC_RSI |
411                                  (unsigned long)INFO_EXT, 0, NULL);
412                 if (*pages <= 0)
413                         return ERR_PTR(-ENOSYS);
414                 else
415                         return diag204_alloc_vbuf(*pages);
416         }
417 }
418
419 /*
420  * diag204_probe() has to find out, which type of diagnose 204 implementation
421  * we have on our machine. Currently there are three possible scanarios:
422  *   - subcode 4   + simple data format (only one page)
423  *   - subcode 4-6 + extended data format
424  *   - subcode 4-7 + extended data format
425  *
426  * Subcode 5 is used to retrieve the size of the data, provided by subcodes
427  * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
428  * to subcode 6 it provides also information about secondary cpus.
429  * In order to get as much information as possible, we first try
430  * subcode 7, then 6 and if both fail, we use subcode 4.
431  */
432
433 static int diag204_probe(void)
434 {
435         void *buf;
436         int pages, rc;
437
438         buf = diag204_get_buffer(INFO_EXT, &pages);
439         if (!IS_ERR(buf)) {
440                 if (diag204((unsigned long)SUBC_STIB7 |
441                             (unsigned long)INFO_EXT, pages, buf) >= 0) {
442                         diag204_store_sc = SUBC_STIB7;
443                         diag204_info_type = INFO_EXT;
444                         goto out;
445                 }
446                 if (diag204((unsigned long)SUBC_STIB6 |
447                             (unsigned long)INFO_EXT, pages, buf) >= 0) {
448                         diag204_store_sc = SUBC_STIB6;
449                         diag204_info_type = INFO_EXT;
450                         goto out;
451                 }
452                 diag204_free_buffer();
453         }
454
455         /* subcodes 6 and 7 failed, now try subcode 4 */
456
457         buf = diag204_get_buffer(INFO_SIMPLE, &pages);
458         if (IS_ERR(buf)) {
459                 rc = PTR_ERR(buf);
460                 goto fail_alloc;
461         }
462         if (diag204((unsigned long)SUBC_STIB4 |
463                     (unsigned long)INFO_SIMPLE, pages, buf) >= 0) {
464                 diag204_store_sc = SUBC_STIB4;
465                 diag204_info_type = INFO_SIMPLE;
466                 goto out;
467         } else {
468                 rc = -ENOSYS;
469                 goto fail_store;
470         }
471 out:
472         rc = 0;
473 fail_store:
474         diag204_free_buffer();
475 fail_alloc:
476         return rc;
477 }
478
479 static int diag204_do_store(void *buf, int pages)
480 {
481         int rc;
482
483         rc = diag204((unsigned long) diag204_store_sc |
484                      (unsigned long) diag204_info_type, pages, buf);
485         return rc < 0 ? -ENOSYS : 0;
486 }
487
488 static void *diag204_store(void)
489 {
490         void *buf;
491         int pages, rc;
492
493         buf = diag204_get_buffer(diag204_info_type, &pages);
494         if (IS_ERR(buf))
495                 goto out;
496         rc = diag204_do_store(buf, pages);
497         if (rc)
498                 return ERR_PTR(rc);
499 out:
500         return buf;
501 }
502
503 /* Diagnose 224 functions */
504
505 static int diag224(void *ptr)
506 {
507         int rc = -EOPNOTSUPP;
508
509         asm volatile(
510                 "       diag    %1,%2,0x224\n"
511                 "0:     lhi     %0,0x0\n"
512                 "1:\n"
513                 EX_TABLE(0b,1b)
514                 : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
515         return rc;
516 }
517
518 static int diag224_get_name_table(void)
519 {
520         /* memory must be below 2GB */
521         diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
522         if (!diag224_cpu_names)
523                 return -ENOMEM;
524         if (diag224(diag224_cpu_names)) {
525                 kfree(diag224_cpu_names);
526                 return -EOPNOTSUPP;
527         }
528         EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
529         return 0;
530 }
531
532 static void diag224_delete_name_table(void)
533 {
534         kfree(diag224_cpu_names);
535 }
536
537 static int diag224_idx2name(int index, char *name)
538 {
539         memcpy(name, diag224_cpu_names + ((index + 1) * CPU_NAME_LEN),
540                 CPU_NAME_LEN);
541         name[CPU_NAME_LEN] = 0;
542         strim(name);
543         return 0;
544 }
545
546 struct dbfs_d204_hdr {
547         u64     len;            /* Length of d204 buffer without header */
548         u16     version;        /* Version of header */
549         u8      sc;             /* Used subcode */
550         char    reserved[53];
551 } __attribute__ ((packed));
552
553 struct dbfs_d204 {
554         struct dbfs_d204_hdr    hdr;    /* 64 byte header */
555         char                    buf[];  /* d204 buffer */
556 } __attribute__ ((packed));
557
558 static int dbfs_d204_create(void **data, void **data_free_ptr, size_t *size)
559 {
560         struct dbfs_d204 *d204;
561         int rc, buf_size;
562         void *base;
563
564         buf_size = PAGE_SIZE * (diag204_buf_pages + 1) + sizeof(d204->hdr);
565         base = vmalloc(buf_size);
566         if (!base)
567                 return -ENOMEM;
568         memset(base, 0, buf_size);
569         d204 = page_align_ptr(base + sizeof(d204->hdr)) - sizeof(d204->hdr);
570         rc = diag204_do_store(d204->buf, diag204_buf_pages);
571         if (rc) {
572                 vfree(base);
573                 return rc;
574         }
575         d204->hdr.version = DBFS_D204_HDR_VERSION;
576         d204->hdr.len = PAGE_SIZE * diag204_buf_pages;
577         d204->hdr.sc = diag204_store_sc;
578         *data = d204;
579         *data_free_ptr = base;
580         *size = d204->hdr.len + sizeof(struct dbfs_d204_hdr);
581         return 0;
582 }
583
584 static struct hypfs_dbfs_file dbfs_file_d204 = {
585         .name           = "diag_204",
586         .data_create    = dbfs_d204_create,
587         .data_free      = vfree,
588 };
589
590 __init int hypfs_diag_init(void)
591 {
592         int rc;
593
594         if (diag204_probe()) {
595                 pr_err("The hardware system does not support hypfs\n");
596                 return -ENODATA;
597         }
598         if (diag204_info_type == INFO_EXT) {
599                 rc = hypfs_dbfs_create_file(&dbfs_file_d204);
600                 if (rc)
601                         return rc;
602         }
603         if (MACHINE_IS_LPAR) {
604                 rc = diag224_get_name_table();
605                 if (rc) {
606                         pr_err("The hardware system does not provide all "
607                                "functions required by hypfs\n");
608                         debugfs_remove(dbfs_d204_file);
609                         return rc;
610                 }
611         }
612         return 0;
613 }
614
615 void hypfs_diag_exit(void)
616 {
617         debugfs_remove(dbfs_d204_file);
618         diag224_delete_name_table();
619         diag204_free_buffer();
620         hypfs_dbfs_remove_file(&dbfs_file_d204);
621 }
622
623 /*
624  * Functions to create the directory structure
625  * *******************************************
626  */
627
628 static int hypfs_create_cpu_files(struct super_block *sb,
629                                   struct dentry *cpus_dir, void *cpu_info)
630 {
631         struct dentry *cpu_dir;
632         char buffer[TMP_SIZE];
633         void *rc;
634
635         snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
636                                                             cpu_info));
637         cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
638         rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
639                               cpu_info__acc_time(diag204_info_type, cpu_info) -
640                               cpu_info__lp_time(diag204_info_type, cpu_info));
641         if (IS_ERR(rc))
642                 return PTR_ERR(rc);
643         rc = hypfs_create_u64(sb, cpu_dir, "cputime",
644                               cpu_info__lp_time(diag204_info_type, cpu_info));
645         if (IS_ERR(rc))
646                 return PTR_ERR(rc);
647         if (diag204_info_type == INFO_EXT) {
648                 rc = hypfs_create_u64(sb, cpu_dir, "onlinetime",
649                                       cpu_info__online_time(diag204_info_type,
650                                                             cpu_info));
651                 if (IS_ERR(rc))
652                         return PTR_ERR(rc);
653         }
654         diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
655         rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
656         if (IS_ERR(rc))
657                 return PTR_ERR(rc);
658         return 0;
659 }
660
661 static void *hypfs_create_lpar_files(struct super_block *sb,
662                                      struct dentry *systems_dir, void *part_hdr)
663 {
664         struct dentry *cpus_dir;
665         struct dentry *lpar_dir;
666         char lpar_name[LPAR_NAME_LEN + 1];
667         void *cpu_info;
668         int i;
669
670         part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
671         lpar_name[LPAR_NAME_LEN] = 0;
672         lpar_dir = hypfs_mkdir(sb, systems_dir, lpar_name);
673         if (IS_ERR(lpar_dir))
674                 return lpar_dir;
675         cpus_dir = hypfs_mkdir(sb, lpar_dir, "cpus");
676         if (IS_ERR(cpus_dir))
677                 return cpus_dir;
678         cpu_info = part_hdr + part_hdr__size(diag204_info_type);
679         for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
680                 int rc;
681                 rc = hypfs_create_cpu_files(sb, cpus_dir, cpu_info);
682                 if (rc)
683                         return ERR_PTR(rc);
684                 cpu_info += cpu_info__size(diag204_info_type);
685         }
686         return cpu_info;
687 }
688
689 static int hypfs_create_phys_cpu_files(struct super_block *sb,
690                                        struct dentry *cpus_dir, void *cpu_info)
691 {
692         struct dentry *cpu_dir;
693         char buffer[TMP_SIZE];
694         void *rc;
695
696         snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
697                                                             cpu_info));
698         cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
699         if (IS_ERR(cpu_dir))
700                 return PTR_ERR(cpu_dir);
701         rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
702                               phys_cpu__mgm_time(diag204_info_type, cpu_info));
703         if (IS_ERR(rc))
704                 return PTR_ERR(rc);
705         diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
706         rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
707         if (IS_ERR(rc))
708                 return PTR_ERR(rc);
709         return 0;
710 }
711
712 static void *hypfs_create_phys_files(struct super_block *sb,
713                                      struct dentry *parent_dir, void *phys_hdr)
714 {
715         int i;
716         void *cpu_info;
717         struct dentry *cpus_dir;
718
719         cpus_dir = hypfs_mkdir(sb, parent_dir, "cpus");
720         if (IS_ERR(cpus_dir))
721                 return cpus_dir;
722         cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
723         for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
724                 int rc;
725                 rc = hypfs_create_phys_cpu_files(sb, cpus_dir, cpu_info);
726                 if (rc)
727                         return ERR_PTR(rc);
728                 cpu_info += phys_cpu__size(diag204_info_type);
729         }
730         return cpu_info;
731 }
732
733 int hypfs_diag_create_files(struct super_block *sb, struct dentry *root)
734 {
735         struct dentry *systems_dir, *hyp_dir;
736         void *time_hdr, *part_hdr;
737         int i, rc;
738         void *buffer, *ptr;
739
740         buffer = diag204_store();
741         if (IS_ERR(buffer))
742                 return PTR_ERR(buffer);
743
744         systems_dir = hypfs_mkdir(sb, root, "systems");
745         if (IS_ERR(systems_dir)) {
746                 rc = PTR_ERR(systems_dir);
747                 goto err_out;
748         }
749         time_hdr = (struct x_info_blk_hdr *)buffer;
750         part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
751         for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
752                 part_hdr = hypfs_create_lpar_files(sb, systems_dir, part_hdr);
753                 if (IS_ERR(part_hdr)) {
754                         rc = PTR_ERR(part_hdr);
755                         goto err_out;
756                 }
757         }
758         if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) {
759                 ptr = hypfs_create_phys_files(sb, root, part_hdr);
760                 if (IS_ERR(ptr)) {
761                         rc = PTR_ERR(ptr);
762                         goto err_out;
763                 }
764         }
765         hyp_dir = hypfs_mkdir(sb, root, "hyp");
766         if (IS_ERR(hyp_dir)) {
767                 rc = PTR_ERR(hyp_dir);
768                 goto err_out;
769         }
770         ptr = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor");
771         if (IS_ERR(ptr)) {
772                 rc = PTR_ERR(ptr);
773                 goto err_out;
774         }
775         rc = 0;
776
777 err_out:
778         return rc;
779 }