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   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/gfp.h>
  16 #include <linux/slab.h>
  17 #include <linux/string.h>
  18 #include <linux/vmalloc.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 /* diag 204 subcodes */
  27 enum diag204_sc {
  28         SUBC_STIB4 = 4,
  29         SUBC_RSI = 5,
  30         SUBC_STIB6 = 6,
  31         SUBC_STIB7 = 7
  32 };
  33
  34 /* The two available diag 204 data formats */
  35 enum diag204_format {
  36         INFO_SIMPLE = 0,
  37         INFO_EXT = 0x00010000
  38 };
  39
  40 /* bit is set in flags, when physical cpu info is included in diag 204 data */
  41 #define LPAR_PHYS_FLG  0x80
  42
  43 static char *diag224_cpu_names;                 /* diag 224 name table */
  44 static enum diag204_sc diag204_store_sc;        /* used subcode for store */
  45 static enum diag204_format diag204_info_type;   /* used diag 204 data format */
  46
  47 static void *diag204_buf;               /* 4K aligned buffer for diag204 data */
  48 static void *diag204_buf_vmalloc;       /* vmalloc pointer for diag204 data */
  49 static int diag204_buf_pages;           /* number of pages for diag204 data */
  50
  51 /*
  52  * DIAG 204 data structures and member access functions.
  53  *
  54  * Since we have two different diag 204 data formats for old and new s390
  55  * machines, we do not access the structs directly, but use getter functions for
  56  * each struct member instead. This should make the code more readable.
  57  */
  58
  59 /* Time information block */
  60
  61 struct info_blk_hdr {
  62         __u8  npar;
  63         __u8  flags;
  64         __u16 tslice;
  65         __u16 phys_cpus;
  66         __u16 this_part;
  67         __u64 curtod;
  68 } __attribute__ ((packed));
  69
  70 struct x_info_blk_hdr {
  71         __u8  npar;
  72         __u8  flags;
  73         __u16 tslice;
  74         __u16 phys_cpus;
  75         __u16 this_part;
  76         __u64 curtod1;
  77         __u64 curtod2;
  78         char reserved[40];
  79 } __attribute__ ((packed));
  80
  81 static inline int info_blk_hdr__size(enum diag204_format type)
  82 {
  83         if (type == INFO_SIMPLE)
  84                 return sizeof(struct info_blk_hdr);
  85         else /* INFO_EXT */
  86                 return sizeof(struct x_info_blk_hdr);
  87 }
  88
  89 static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
  90 {
  91         if (type == INFO_SIMPLE)
  92                 return ((struct info_blk_hdr *)hdr)->npar;
  93         else /* INFO_EXT */
  94                 return ((struct x_info_blk_hdr *)hdr)->npar;
  95 }
  96
  97 static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
  98 {
  99         if (type == INFO_SIMPLE)
 100                 return ((struct info_blk_hdr *)hdr)->flags;
 101         else /* INFO_EXT */
 102                 return ((struct x_info_blk_hdr *)hdr)->flags;
 103 }
 104
 105 static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
 106 {
 107         if (type == INFO_SIMPLE)
 108                 return ((struct info_blk_hdr *)hdr)->phys_cpus;
 109         else /* INFO_EXT */
 110                 return ((struct x_info_blk_hdr *)hdr)->phys_cpus;
 111 }
 112
 113 /* Partition header */
 114
 115 struct part_hdr {
 116         __u8 pn;
 117         __u8 cpus;
 118         char reserved[6];
 119         char part_name[LPAR_NAME_LEN];
 120 } __attribute__ ((packed));
 121
 122 struct x_part_hdr {
 123         __u8  pn;
 124         __u8  cpus;
 125         __u8  rcpus;
 126         __u8  pflag;
 127         __u32 mlu;
 128         char  part_name[LPAR_NAME_LEN];
 129         char  lpc_name[8];
 130         char  os_name[8];
 131         __u64 online_cs;
 132         __u64 online_es;
 133         __u8  upid;
 134         char  reserved1[3];
 135         __u32 group_mlu;
 136         char  group_name[8];
 137         char  reserved2[32];
 138 } __attribute__ ((packed));
 139
 140 static inline int part_hdr__size(enum diag204_format type)
 141 {
 142         if (type == INFO_SIMPLE)
 143                 return sizeof(struct part_hdr);
 144         else /* INFO_EXT */
 145                 return sizeof(struct x_part_hdr);
 146 }
 147
 148 static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
 149 {
 150         if (type == INFO_SIMPLE)
 151                 return ((struct part_hdr *)hdr)->cpus;
 152         else /* INFO_EXT */
 153                 return ((struct x_part_hdr *)hdr)->rcpus;
 154 }
 155
 156 static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
 157                                        char *name)
 158 {
 159         if (type == INFO_SIMPLE)
 160                 memcpy(name, ((struct part_hdr *)hdr)->part_name,
 161                        LPAR_NAME_LEN);
 162         else /* INFO_EXT */
 163                 memcpy(name, ((struct x_part_hdr *)hdr)->part_name,
 164                        LPAR_NAME_LEN);
 165         EBCASC(name, LPAR_NAME_LEN);
 166         name[LPAR_NAME_LEN] = 0;
 167         strstrip(name);
 168 }
 169
 170 struct cpu_info {
 171         __u16 cpu_addr;
 172         char  reserved1[2];
 173         __u8  ctidx;
 174         __u8  cflag;
 175         __u16 weight;
 176         __u64 acc_time;
 177         __u64 lp_time;
 178 } __attribute__ ((packed));
 179
 180 struct x_cpu_info {
 181         __u16 cpu_addr;
 182         char  reserved1[2];
 183         __u8  ctidx;
 184         __u8  cflag;
 185         __u16 weight;
 186         __u64 acc_time;
 187         __u64 lp_time;
 188         __u16 min_weight;
 189         __u16 cur_weight;
 190         __u16 max_weight;
 191         char  reseved2[2];
 192         __u64 online_time;
 193         __u64 wait_time;
 194         __u32 pma_weight;
 195         __u32 polar_weight;
 196         char  reserved3[40];
 197 } __attribute__ ((packed));
 198
 199 /* CPU info block */
 200
 201 static inline int cpu_info__size(enum diag204_format type)
 202 {
 203         if (type == INFO_SIMPLE)
 204                 return sizeof(struct cpu_info);
 205         else /* INFO_EXT */
 206                 return sizeof(struct x_cpu_info);
 207 }
 208
 209 static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
 210 {
 211         if (type == INFO_SIMPLE)
 212                 return ((struct cpu_info *)hdr)->ctidx;
 213         else /* INFO_EXT */
 214                 return ((struct x_cpu_info *)hdr)->ctidx;
 215 }
 216
 217 static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
 218 {
 219         if (type == INFO_SIMPLE)
 220                 return ((struct cpu_info *)hdr)->cpu_addr;
 221         else /* INFO_EXT */
 222                 return ((struct x_cpu_info *)hdr)->cpu_addr;
 223 }
 224
 225 static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
 226 {
 227         if (type == INFO_SIMPLE)
 228                 return ((struct cpu_info *)hdr)->acc_time;
 229         else /* INFO_EXT */
 230                 return ((struct x_cpu_info *)hdr)->acc_time;
 231 }
 232
 233 static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
 234 {
 235         if (type == INFO_SIMPLE)
 236                 return ((struct cpu_info *)hdr)->lp_time;
 237         else /* INFO_EXT */
 238                 return ((struct x_cpu_info *)hdr)->lp_time;
 239 }
 240
 241 static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
 242 {
 243         if (type == INFO_SIMPLE)
 244                 return 0;       /* online_time not available in simple info */
 245         else /* INFO_EXT */
 246                 return ((struct x_cpu_info *)hdr)->online_time;
 247 }
 248
 249 /* Physical header */
 250
 251 struct phys_hdr {
 252         char reserved1[1];
 253         __u8 cpus;
 254         char reserved2[6];
 255         char mgm_name[8];
 256 } __attribute__ ((packed));
 257
 258 struct x_phys_hdr {
 259         char reserved1[1];
 260         __u8 cpus;
 261         char reserved2[6];
 262         char mgm_name[8];
 263         char reserved3[80];
 264 } __attribute__ ((packed));
 265
 266 static inline int phys_hdr__size(enum diag204_format type)
 267 {
 268         if (type == INFO_SIMPLE)
 269                 return sizeof(struct phys_hdr);
 270         else /* INFO_EXT */
 271                 return sizeof(struct x_phys_hdr);
 272 }
 273
 274 static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
 275 {
 276         if (type == INFO_SIMPLE)
 277                 return ((struct phys_hdr *)hdr)->cpus;
 278         else /* INFO_EXT */
 279                 return ((struct x_phys_hdr *)hdr)->cpus;
 280 }
 281
 282 /* Physical CPU info block */
 283
 284 struct phys_cpu {
 285         __u16 cpu_addr;
 286         char  reserved1[2];
 287         __u8  ctidx;
 288         char  reserved2[3];
 289         __u64 mgm_time;
 290         char  reserved3[8];
 291 } __attribute__ ((packed));
 292
 293 struct x_phys_cpu {
 294         __u16 cpu_addr;
 295         char  reserved1[2];
 296         __u8  ctidx;
 297         char  reserved2[3];
 298         __u64 mgm_time;
 299         char  reserved3[80];
 300 } __attribute__ ((packed));
 301
 302 static inline int phys_cpu__size(enum diag204_format type)
 303 {
 304         if (type == INFO_SIMPLE)
 305                 return sizeof(struct phys_cpu);
 306         else /* INFO_EXT */
 307                 return sizeof(struct x_phys_cpu);
 308 }
 309
 310 static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
 311 {
 312         if (type == INFO_SIMPLE)
 313                 return ((struct phys_cpu *)hdr)->cpu_addr;
 314         else /* INFO_EXT */
 315                 return ((struct x_phys_cpu *)hdr)->cpu_addr;
 316 }
 317
 318 static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
 319 {
 320         if (type == INFO_SIMPLE)
 321                 return ((struct phys_cpu *)hdr)->mgm_time;
 322         else /* INFO_EXT */
 323                 return ((struct x_phys_cpu *)hdr)->mgm_time;
 324 }
 325
 326 static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
 327 {
 328         if (type == INFO_SIMPLE)
 329                 return ((struct phys_cpu *)hdr)->ctidx;
 330         else /* INFO_EXT */
 331                 return ((struct x_phys_cpu *)hdr)->ctidx;
 332 }
 333
 334 /* Diagnose 204 functions */
 335
 336 static int diag204(unsigned long subcode, unsigned long size, void *addr)
 337 {
 338         register unsigned long _subcode asm("0") = subcode;
 339         register unsigned long _size asm("1") = size;
 340
 341         asm volatile(
 342                 "       diag    %2,%0,0x204\n"
 343                 "0:\n"
 344                 EX_TABLE(0b,0b)
 345                 : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory");
 346         if (_subcode)
 347                 return -1;
 348         return _size;
 349 }
 350
 351 /*
 352  * For the old diag subcode 4 with simple data format we have to use real
 353  * memory. If we use subcode 6 or 7 with extended data format, we can (and
 354  * should) use vmalloc, since we need a lot of memory in that case. Currently
 355  * up to 93 pages!
 356  */
 357
 358 static void diag204_free_buffer(void)
 359 {
 360         if (!diag204_buf)
 361                 return;
 362         if (diag204_buf_vmalloc) {
 363                 vfree(diag204_buf_vmalloc);
 364                 diag204_buf_vmalloc = NULL;
 365         } else {
 366                 free_pages((unsigned long) diag204_buf, 0);
 367         }
 368         diag204_buf_pages = 0;
 369         diag204_buf = NULL;
 370 }
 371
 372 static void *diag204_alloc_vbuf(int pages)
 373 {
 374         /* The buffer has to be page aligned! */
 375         diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1));
 376         if (!diag204_buf_vmalloc)
 377                 return ERR_PTR(-ENOMEM);
 378         diag204_buf = (void*)((unsigned long)diag204_buf_vmalloc
 379                                 & ~0xfffUL) + 0x1000;
 380         diag204_buf_pages = pages;
 381         return diag204_buf;
 382 }
 383
 384 static void *diag204_alloc_rbuf(void)
 385 {
 386         diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
 387         if (!diag204_buf)
 388                 return ERR_PTR(-ENOMEM);
 389         diag204_buf_pages = 1;
 390         return diag204_buf;
 391 }
 392
 393 static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
 394 {
 395         if (diag204_buf) {
 396                 *pages = diag204_buf_pages;
 397                 return diag204_buf;
 398         }
 399         if (fmt == INFO_SIMPLE) {
 400                 *pages = 1;
 401                 return diag204_alloc_rbuf();
 402         } else {/* INFO_EXT */
 403                 *pages = diag204((unsigned long)SUBC_RSI |
 404                                  (unsigned long)INFO_EXT, 0, NULL);
 405                 if (*pages <= 0)
 406                         return ERR_PTR(-ENOSYS);
 407                 else
 408                         return diag204_alloc_vbuf(*pages);
 409         }
 410 }
 411
 412 /*
 413  * diag204_probe() has to find out, which type of diagnose 204 implementation
 414  * we have on our machine. Currently there are three possible scanarios:
 415  *   - subcode 4   + simple data format (only one page)
 416  *   - subcode 4-6 + extended data format
 417  *   - subcode 4-7 + extended data format
 418  *
 419  * Subcode 5 is used to retrieve the size of the data, provided by subcodes
 420  * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
 421  * to subcode 6 it provides also information about secondary cpus.
 422  * In order to get as much information as possible, we first try
 423  * subcode 7, then 6 and if both fail, we use subcode 4.
 424  */
 425
 426 static int diag204_probe(void)
 427 {
 428         void *buf;
 429         int pages, rc;
 430
 431         buf = diag204_get_buffer(INFO_EXT, &pages);
 432         if (!IS_ERR(buf)) {
 433                 if (diag204((unsigned long)SUBC_STIB7 |
 434                             (unsigned long)INFO_EXT, pages, buf) >= 0) {
 435                         diag204_store_sc = SUBC_STIB7;
 436                         diag204_info_type = INFO_EXT;
 437                         goto out;
 438                 }
 439                 if (diag204((unsigned long)SUBC_STIB6 |
 440                             (unsigned long)INFO_EXT, pages, buf) >= 0) {
 441                         diag204_store_sc = SUBC_STIB7;
 442                         diag204_info_type = INFO_EXT;
 443                         goto out;
 444                 }
 445                 diag204_free_buffer();
 446         }
 447
 448         /* subcodes 6 and 7 failed, now try subcode 4 */
 449
 450         buf = diag204_get_buffer(INFO_SIMPLE, &pages);
 451         if (IS_ERR(buf)) {
 452                 rc = PTR_ERR(buf);
 453                 goto fail_alloc;
 454         }
 455         if (diag204((unsigned long)SUBC_STIB4 |
 456                     (unsigned long)INFO_SIMPLE, pages, buf) >= 0) {
 457                 diag204_store_sc = SUBC_STIB4;
 458                 diag204_info_type = INFO_SIMPLE;
 459                 goto out;
 460         } else {
 461                 rc = -ENOSYS;
 462                 goto fail_store;
 463         }
 464 out:
 465         rc = 0;
 466 fail_store:
 467         diag204_free_buffer();
 468 fail_alloc:
 469         return rc;
 470 }
 471
 472 static void *diag204_store(void)
 473 {
 474         void *buf;
 475         int pages;
 476
 477         buf = diag204_get_buffer(diag204_info_type, &pages);
 478         if (IS_ERR(buf))
 479                 goto out;
 480         if (diag204((unsigned long)diag204_store_sc |
 481                     (unsigned long)diag204_info_type, pages, buf) < 0)
 482                 return ERR_PTR(-ENOSYS);
 483 out:
 484         return buf;
 485 }
 486
 487 /* Diagnose 224 functions */
 488
 489 static int diag224(void *ptr)
 490 {
 491         int rc = -ENOTSUPP;
 492
 493         asm volatile(
 494                 "       diag    %1,%2,0x224\n"
 495                 "0:     lhi     %0,0x0\n"
 496                 "1:\n"
 497                 EX_TABLE(0b,1b)
 498                 : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
 499         return rc;
 500 }
 501
 502 static int diag224_get_name_table(void)
 503 {
 504         /* memory must be below 2GB */
 505         diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 506         if (!diag224_cpu_names)
 507                 return -ENOMEM;
 508         if (diag224(diag224_cpu_names)) {
 509                 kfree(diag224_cpu_names);
 510                 return -ENOTSUPP;
 511         }
 512         EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
 513         return 0;
 514 }
 515
 516 static void diag224_delete_name_table(void)
 517 {
 518         kfree(diag224_cpu_names);
 519 }
 520
 521 static int diag224_idx2name(int index, char *name)
 522 {
 523         memcpy(name, diag224_cpu_names + ((index + 1) * CPU_NAME_LEN),
 524                 CPU_NAME_LEN);
 525         name[CPU_NAME_LEN] = 0;
 526         strstrip(name);
 527         return 0;
 528 }
 529
 530 __init int hypfs_diag_init(void)
 531 {
 532         int rc;
 533
 534         if (diag204_probe()) {
 535                 pr_err("The hardware system does not support hypfs\n");
 536                 return -ENODATA;
 537         }
 538         rc = diag224_get_name_table();
 539         if (rc) {
 540                 diag204_free_buffer();
 541                 pr_err("The hardware system does not provide all "
 542                        "functions required by hypfs\n");
 543         }
 544         return rc;
 545 }
 546
 547 void hypfs_diag_exit(void)
 548 {
 549         diag224_delete_name_table();
 550         diag204_free_buffer();
 551 }
 552
 553 /*
 554  * Functions to create the directory structure
 555  * *******************************************
 556  */
 557
 558 static int hypfs_create_cpu_files(struct super_block *sb,
 559                                   struct dentry *cpus_dir, void *cpu_info)
 560 {
 561         struct dentry *cpu_dir;
 562         char buffer[TMP_SIZE];
 563         void *rc;
 564
 565         snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
 566                                                             cpu_info));
 567         cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
 568         rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
 569                               cpu_info__acc_time(diag204_info_type, cpu_info) -
 570                               cpu_info__lp_time(diag204_info_type, cpu_info));
 571         if (IS_ERR(rc))
 572                 return PTR_ERR(rc);
 573         rc = hypfs_create_u64(sb, cpu_dir, "cputime",
 574                               cpu_info__lp_time(diag204_info_type, cpu_info));
 575         if (IS_ERR(rc))
 576                 return PTR_ERR(rc);
 577         if (diag204_info_type == INFO_EXT) {
 578                 rc = hypfs_create_u64(sb, cpu_dir, "onlinetime",
 579                                       cpu_info__online_time(diag204_info_type,
 580                                                             cpu_info));
 581                 if (IS_ERR(rc))
 582                         return PTR_ERR(rc);
 583         }
 584         diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
 585         rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
 586         if (IS_ERR(rc))
 587                 return PTR_ERR(rc);
 588         return 0;
 589 }
 590
 591 static void *hypfs_create_lpar_files(struct super_block *sb,
 592                                      struct dentry *systems_dir, void *part_hdr)
 593 {
 594         struct dentry *cpus_dir;
 595         struct dentry *lpar_dir;
 596         char lpar_name[LPAR_NAME_LEN + 1];
 597         void *cpu_info;
 598         int i;
 599
 600         part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
 601         lpar_name[LPAR_NAME_LEN] = 0;
 602         lpar_dir = hypfs_mkdir(sb, systems_dir, lpar_name);
 603         if (IS_ERR(lpar_dir))
 604                 return lpar_dir;
 605         cpus_dir = hypfs_mkdir(sb, lpar_dir, "cpus");
 606         if (IS_ERR(cpus_dir))
 607                 return cpus_dir;
 608         cpu_info = part_hdr + part_hdr__size(diag204_info_type);
 609         for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
 610                 int rc;
 611                 rc = hypfs_create_cpu_files(sb, cpus_dir, cpu_info);
 612                 if (rc)
 613                         return ERR_PTR(rc);
 614                 cpu_info += cpu_info__size(diag204_info_type);
 615         }
 616         return cpu_info;
 617 }
 618
 619 static int hypfs_create_phys_cpu_files(struct super_block *sb,
 620                                        struct dentry *cpus_dir, void *cpu_info)
 621 {
 622         struct dentry *cpu_dir;
 623         char buffer[TMP_SIZE];
 624         void *rc;
 625
 626         snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
 627                                                             cpu_info));
 628         cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
 629         if (IS_ERR(cpu_dir))
 630                 return PTR_ERR(cpu_dir);
 631         rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
 632                               phys_cpu__mgm_time(diag204_info_type, cpu_info));
 633         if (IS_ERR(rc))
 634                 return PTR_ERR(rc);
 635         diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
 636         rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
 637         if (IS_ERR(rc))
 638                 return PTR_ERR(rc);
 639         return 0;
 640 }
 641
 642 static void *hypfs_create_phys_files(struct super_block *sb,
 643                                      struct dentry *parent_dir, void *phys_hdr)
 644 {
 645         int i;
 646         void *cpu_info;
 647         struct dentry *cpus_dir;
 648
 649         cpus_dir = hypfs_mkdir(sb, parent_dir, "cpus");
 650         if (IS_ERR(cpus_dir))
 651                 return cpus_dir;
 652         cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
 653         for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
 654                 int rc;
 655                 rc = hypfs_create_phys_cpu_files(sb, cpus_dir, cpu_info);
 656                 if (rc)
 657                         return ERR_PTR(rc);
 658                 cpu_info += phys_cpu__size(diag204_info_type);
 659         }
 660         return cpu_info;
 661 }
 662
 663 int hypfs_diag_create_files(struct super_block *sb, struct dentry *root)
 664 {
 665         struct dentry *systems_dir, *hyp_dir;
 666         void *time_hdr, *part_hdr;
 667         int i, rc;
 668         void *buffer, *ptr;
 669
 670         buffer = diag204_store();
 671         if (IS_ERR(buffer))
 672                 return PTR_ERR(buffer);
 673
 674         systems_dir = hypfs_mkdir(sb, root, "systems");
 675         if (IS_ERR(systems_dir)) {
 676                 rc = PTR_ERR(systems_dir);
 677                 goto err_out;
 678         }
 679         time_hdr = (struct x_info_blk_hdr *)buffer;
 680         part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
 681         for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
 682                 part_hdr = hypfs_create_lpar_files(sb, systems_dir, part_hdr);
 683                 if (IS_ERR(part_hdr)) {
 684                         rc = PTR_ERR(part_hdr);
 685                         goto err_out;
 686                 }
 687         }
 688         if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) {
 689                 ptr = hypfs_create_phys_files(sb, root, part_hdr);
 690                 if (IS_ERR(ptr)) {
 691                         rc = PTR_ERR(ptr);
 692                         goto err_out;
 693                 }
 694         }
 695         hyp_dir = hypfs_mkdir(sb, root, "hyp");
 696         if (IS_ERR(hyp_dir)) {
 697                 rc = PTR_ERR(hyp_dir);
 698                 goto err_out;
 699         }
 700         ptr = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor");
 701         if (IS_ERR(ptr)) {
 702                 rc = PTR_ERR(ptr);
 703                 goto err_out;
 704         }
 705         rc = 0;
 706
 707 err_out:
 708         return rc;
 709 }