linux/arch/s390/hypfs/hypfs_diag.c
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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 (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 */
  22enum 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 */
  30enum 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
  38static char *diag224_cpu_names;                 /* diag 224 name table */
  39static enum diag204_sc diag204_store_sc;        /* used subcode for store */
  40static enum diag204_format diag204_info_type;   /* used diag 204 data format */
  41
  42static void *diag204_buf;               /* 4K aligned buffer for diag204 data */
  43static void *diag204_buf_vmalloc;       /* vmalloc pointer for diag204 data */
  44static 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
  56struct 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
  65struct 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
  76static 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
  84static 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
  92static 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
 100static 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
 110struct part_hdr {
 111        __u8 pn;
 112        __u8 cpus;
 113        char reserved[6];
 114        char part_name[LPAR_NAME_LEN];
 115} __attribute__ ((packed));
 116
 117struct 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
 135static 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
 143static 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
 151static 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
 165struct 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
 175struct 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
 196static 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
 204static 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
 212static 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
 220static 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
 228static 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
 236static 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
 246struct phys_hdr {
 247        char reserved1[1];
 248        __u8 cpus;
 249        char reserved2[6];
 250        char mgm_name[8];
 251} __attribute__ ((packed));
 252
 253struct 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
 261static 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
 269static 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
 279struct 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
 288struct 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
 297static 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
 305static 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
 313static 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
 321static 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
 331static 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
 353static 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
 367static 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
 379static 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
 388static 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
 421static 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        }
 459out:
 460        rc = 0;
 461fail_store:
 462        diag204_free_buffer();
 463fail_alloc:
 464        return rc;
 465}
 466
 467static 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);
 478out:
 479        return buf;
 480}
 481
 482/* Diagnose 224 functions */
 483
 484static 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
 497static 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
 511static void diag224_delete_name_table(void)
 512{
 513        kfree(diag224_cpu_names);
 514}
 515
 516static 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
 541void 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
 552static 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
 585static 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
 613static 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
 636static 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
 657int 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
 701err_out:
 702        return rc;
 703}
 704
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