kernel/arch/s390/hypfs/hypfs_diag.c

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