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/diag.h>
  19 #include <asm/ebcdic.h>
  20 #include "hypfs.h"
  21
  22 #define TMP_SIZE 64             /* size of temporary buffers */
  23
  24 #define DBFS_D204_HDR_VERSION   0
  25
  26 static char *diag224_cpu_names;                 /* diag 224 name table */
  27 static enum diag204_sc diag204_store_sc;        /* used subcode for store */
  28 static enum diag204_format diag204_info_type;   /* used diag 204 data format */
  29
  30 static void *diag204_buf;               /* 4K aligned buffer for diag204 data */
  31 static void *diag204_buf_vmalloc;       /* vmalloc pointer for diag204 data */
  32 static int diag204_buf_pages;           /* number of pages for diag204 data */
  33
  34 static struct dentry *dbfs_d204_file;
  35
  36 /*
  37  * DIAG 204 member access functions.
  38  *
  39  * Since we have two different diag 204 data formats for old and new s390
  40  * machines, we do not access the structs directly, but use getter functions for
  41  * each struct member instead. This should make the code more readable.
  42  */
  43
  44 /* Time information block */
  45
  46 static inline int info_blk_hdr__size(enum diag204_format type)
  47 {
  48         if (type == DIAG204_INFO_SIMPLE)
  49                 return sizeof(struct diag204_info_blk_hdr);
  50         else /* DIAG204_INFO_EXT */
  51                 return sizeof(struct diag204_x_info_blk_hdr);
  52 }
  53
  54 static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
  55 {
  56         if (type == DIAG204_INFO_SIMPLE)
  57                 return ((struct diag204_info_blk_hdr *)hdr)->npar;
  58         else /* DIAG204_INFO_EXT */
  59                 return ((struct diag204_x_info_blk_hdr *)hdr)->npar;
  60 }
  61
  62 static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
  63 {
  64         if (type == DIAG204_INFO_SIMPLE)
  65                 return ((struct diag204_info_blk_hdr *)hdr)->flags;
  66         else /* DIAG204_INFO_EXT */
  67                 return ((struct diag204_x_info_blk_hdr *)hdr)->flags;
  68 }
  69
  70 static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
  71 {
  72         if (type == DIAG204_INFO_SIMPLE)
  73                 return ((struct diag204_info_blk_hdr *)hdr)->phys_cpus;
  74         else /* DIAG204_INFO_EXT */
  75                 return ((struct diag204_x_info_blk_hdr *)hdr)->phys_cpus;
  76 }
  77
  78 /* Partition header */
  79
  80 static inline int part_hdr__size(enum diag204_format type)
  81 {
  82         if (type == DIAG204_INFO_SIMPLE)
  83                 return sizeof(struct diag204_part_hdr);
  84         else /* DIAG204_INFO_EXT */
  85                 return sizeof(struct diag204_x_part_hdr);
  86 }
  87
  88 static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
  89 {
  90         if (type == DIAG204_INFO_SIMPLE)
  91                 return ((struct diag204_part_hdr *)hdr)->cpus;
  92         else /* DIAG204_INFO_EXT */
  93                 return ((struct diag204_x_part_hdr *)hdr)->rcpus;
  94 }
  95
  96 static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
  97                                        char *name)
  98 {
  99         if (type == DIAG204_INFO_SIMPLE)
 100                 memcpy(name, ((struct diag204_part_hdr *)hdr)->part_name,
 101                        DIAG204_LPAR_NAME_LEN);
 102         else /* DIAG204_INFO_EXT */
 103                 memcpy(name, ((struct diag204_x_part_hdr *)hdr)->part_name,
 104                        DIAG204_LPAR_NAME_LEN);
 105         EBCASC(name, DIAG204_LPAR_NAME_LEN);
 106         name[DIAG204_LPAR_NAME_LEN] = 0;
 107         strim(name);
 108 }
 109
 110 /* CPU info block */
 111
 112 static inline int cpu_info__size(enum diag204_format type)
 113 {
 114         if (type == DIAG204_INFO_SIMPLE)
 115                 return sizeof(struct diag204_cpu_info);
 116         else /* DIAG204_INFO_EXT */
 117                 return sizeof(struct diag204_x_cpu_info);
 118 }
 119
 120 static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
 121 {
 122         if (type == DIAG204_INFO_SIMPLE)
 123                 return ((struct diag204_cpu_info *)hdr)->ctidx;
 124         else /* DIAG204_INFO_EXT */
 125                 return ((struct diag204_x_cpu_info *)hdr)->ctidx;
 126 }
 127
 128 static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
 129 {
 130         if (type == DIAG204_INFO_SIMPLE)
 131                 return ((struct diag204_cpu_info *)hdr)->cpu_addr;
 132         else /* DIAG204_INFO_EXT */
 133                 return ((struct diag204_x_cpu_info *)hdr)->cpu_addr;
 134 }
 135
 136 static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
 137 {
 138         if (type == DIAG204_INFO_SIMPLE)
 139                 return ((struct diag204_cpu_info *)hdr)->acc_time;
 140         else /* DIAG204_INFO_EXT */
 141                 return ((struct diag204_x_cpu_info *)hdr)->acc_time;
 142 }
 143
 144 static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
 145 {
 146         if (type == DIAG204_INFO_SIMPLE)
 147                 return ((struct diag204_cpu_info *)hdr)->lp_time;
 148         else /* DIAG204_INFO_EXT */
 149                 return ((struct diag204_x_cpu_info *)hdr)->lp_time;
 150 }
 151
 152 static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
 153 {
 154         if (type == DIAG204_INFO_SIMPLE)
 155                 return 0;       /* online_time not available in simple info */
 156         else /* DIAG204_INFO_EXT */
 157                 return ((struct diag204_x_cpu_info *)hdr)->online_time;
 158 }
 159
 160 /* Physical header */
 161
 162 static inline int phys_hdr__size(enum diag204_format type)
 163 {
 164         if (type == DIAG204_INFO_SIMPLE)
 165                 return sizeof(struct diag204_phys_hdr);
 166         else /* DIAG204_INFO_EXT */
 167                 return sizeof(struct diag204_x_phys_hdr);
 168 }
 169
 170 static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
 171 {
 172         if (type == DIAG204_INFO_SIMPLE)
 173                 return ((struct diag204_phys_hdr *)hdr)->cpus;
 174         else /* DIAG204_INFO_EXT */
 175                 return ((struct diag204_x_phys_hdr *)hdr)->cpus;
 176 }
 177
 178 /* Physical CPU info block */
 179
 180 static inline int phys_cpu__size(enum diag204_format type)
 181 {
 182         if (type == DIAG204_INFO_SIMPLE)
 183                 return sizeof(struct diag204_phys_cpu);
 184         else /* DIAG204_INFO_EXT */
 185                 return sizeof(struct diag204_x_phys_cpu);
 186 }
 187
 188 static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
 189 {
 190         if (type == DIAG204_INFO_SIMPLE)
 191                 return ((struct diag204_phys_cpu *)hdr)->cpu_addr;
 192         else /* DIAG204_INFO_EXT */
 193                 return ((struct diag204_x_phys_cpu *)hdr)->cpu_addr;
 194 }
 195
 196 static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
 197 {
 198         if (type == DIAG204_INFO_SIMPLE)
 199                 return ((struct diag204_phys_cpu *)hdr)->mgm_time;
 200         else /* DIAG204_INFO_EXT */
 201                 return ((struct diag204_x_phys_cpu *)hdr)->mgm_time;
 202 }
 203
 204 static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
 205 {
 206         if (type == DIAG204_INFO_SIMPLE)
 207                 return ((struct diag204_phys_cpu *)hdr)->ctidx;
 208         else /* DIAG204_INFO_EXT */
 209                 return ((struct diag204_x_phys_cpu *)hdr)->ctidx;
 210 }
 211
 212 /* Diagnose 204 functions */
 213 /*
 214  * For the old diag subcode 4 with simple data format we have to use real
 215  * memory. If we use subcode 6 or 7 with extended data format, we can (and
 216  * should) use vmalloc, since we need a lot of memory in that case. Currently
 217  * up to 93 pages!
 218  */
 219
 220 static void diag204_free_buffer(void)
 221 {
 222         if (!diag204_buf)
 223                 return;
 224         if (diag204_buf_vmalloc) {
 225                 vfree(diag204_buf_vmalloc);
 226                 diag204_buf_vmalloc = NULL;
 227         } else {
 228                 free_pages((unsigned long) diag204_buf, 0);
 229         }
 230         diag204_buf = NULL;
 231 }
 232
 233 static void *page_align_ptr(void *ptr)
 234 {
 235         return (void *) PAGE_ALIGN((unsigned long) ptr);
 236 }
 237
 238 static void *diag204_alloc_vbuf(int pages)
 239 {
 240         /* The buffer has to be page aligned! */
 241         diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1));
 242         if (!diag204_buf_vmalloc)
 243                 return ERR_PTR(-ENOMEM);
 244         diag204_buf = page_align_ptr(diag204_buf_vmalloc);
 245         diag204_buf_pages = pages;
 246         return diag204_buf;
 247 }
 248
 249 static void *diag204_alloc_rbuf(void)
 250 {
 251         diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
 252         if (!diag204_buf)
 253                 return ERR_PTR(-ENOMEM);
 254         diag204_buf_pages = 1;
 255         return diag204_buf;
 256 }
 257
 258 static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
 259 {
 260         if (diag204_buf) {
 261                 *pages = diag204_buf_pages;
 262                 return diag204_buf;
 263         }
 264         if (fmt == DIAG204_INFO_SIMPLE) {
 265                 *pages = 1;
 266                 return diag204_alloc_rbuf();
 267         } else {/* DIAG204_INFO_EXT */
 268                 *pages = diag204((unsigned long)DIAG204_SUBC_RSI |
 269                                  (unsigned long)DIAG204_INFO_EXT, 0, NULL);
 270                 if (*pages <= 0)
 271                         return ERR_PTR(-ENOSYS);
 272                 else
 273                         return diag204_alloc_vbuf(*pages);
 274         }
 275 }
 276
 277 /*
 278  * diag204_probe() has to find out, which type of diagnose 204 implementation
 279  * we have on our machine. Currently there are three possible scanarios:
 280  *   - subcode 4   + simple data format (only one page)
 281  *   - subcode 4-6 + extended data format
 282  *   - subcode 4-7 + extended data format
 283  *
 284  * Subcode 5 is used to retrieve the size of the data, provided by subcodes
 285  * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
 286  * to subcode 6 it provides also information about secondary cpus.
 287  * In order to get as much information as possible, we first try
 288  * subcode 7, then 6 and if both fail, we use subcode 4.
 289  */
 290
 291 static int diag204_probe(void)
 292 {
 293         void *buf;
 294         int pages, rc;
 295
 296         buf = diag204_get_buffer(DIAG204_INFO_EXT, &pages);
 297         if (!IS_ERR(buf)) {
 298                 if (diag204((unsigned long)DIAG204_SUBC_STIB7 |
 299                             (unsigned long)DIAG204_INFO_EXT, pages, buf) >= 0) {
 300                         diag204_store_sc = DIAG204_SUBC_STIB7;
 301                         diag204_info_type = DIAG204_INFO_EXT;
 302                         goto out;
 303                 }
 304                 if (diag204((unsigned long)DIAG204_SUBC_STIB6 |
 305                             (unsigned long)DIAG204_INFO_EXT, pages, buf) >= 0) {
 306                         diag204_store_sc = DIAG204_SUBC_STIB6;
 307                         diag204_info_type = DIAG204_INFO_EXT;
 308                         goto out;
 309                 }
 310                 diag204_free_buffer();
 311         }
 312
 313         /* subcodes 6 and 7 failed, now try subcode 4 */
 314
 315         buf = diag204_get_buffer(DIAG204_INFO_SIMPLE, &pages);
 316         if (IS_ERR(buf)) {
 317                 rc = PTR_ERR(buf);
 318                 goto fail_alloc;
 319         }
 320         if (diag204((unsigned long)DIAG204_SUBC_STIB4 |
 321                     (unsigned long)DIAG204_INFO_SIMPLE, pages, buf) >= 0) {
 322                 diag204_store_sc = DIAG204_SUBC_STIB4;
 323                 diag204_info_type = DIAG204_INFO_SIMPLE;
 324                 goto out;
 325         } else {
 326                 rc = -ENOSYS;
 327                 goto fail_store;
 328         }
 329 out:
 330         rc = 0;
 331 fail_store:
 332         diag204_free_buffer();
 333 fail_alloc:
 334         return rc;
 335 }
 336
 337 static int diag204_do_store(void *buf, int pages)
 338 {
 339         int rc;
 340
 341         rc = diag204((unsigned long) diag204_store_sc |
 342                      (unsigned long) diag204_info_type, pages, buf);
 343         return rc < 0 ? -ENOSYS : 0;
 344 }
 345
 346 static void *diag204_store(void)
 347 {
 348         void *buf;
 349         int pages, rc;
 350
 351         buf = diag204_get_buffer(diag204_info_type, &pages);
 352         if (IS_ERR(buf))
 353                 goto out;
 354         rc = diag204_do_store(buf, pages);
 355         if (rc)
 356                 return ERR_PTR(rc);
 357 out:
 358         return buf;
 359 }
 360
 361 /* Diagnose 224 functions */
 362
 363 static int diag224_get_name_table(void)
 364 {
 365         /* memory must be below 2GB */
 366         diag224_cpu_names = (char *) __get_free_page(GFP_KERNEL | GFP_DMA);
 367         if (!diag224_cpu_names)
 368                 return -ENOMEM;
 369         if (diag224(diag224_cpu_names)) {
 370                 free_page((unsigned long) diag224_cpu_names);
 371                 return -EOPNOTSUPP;
 372         }
 373         EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
 374         return 0;
 375 }
 376
 377 static void diag224_delete_name_table(void)
 378 {
 379         free_page((unsigned long) diag224_cpu_names);
 380 }
 381
 382 static int diag224_idx2name(int index, char *name)
 383 {
 384         memcpy(name, diag224_cpu_names + ((index + 1) * DIAG204_CPU_NAME_LEN),
 385                DIAG204_CPU_NAME_LEN);
 386         name[DIAG204_CPU_NAME_LEN] = 0;
 387         strim(name);
 388         return 0;
 389 }
 390
 391 struct dbfs_d204_hdr {
 392         u64     len;            /* Length of d204 buffer without header */
 393         u16     version;        /* Version of header */
 394         u8      sc;             /* Used subcode */
 395         char    reserved[53];
 396 } __attribute__ ((packed));
 397
 398 struct dbfs_d204 {
 399         struct dbfs_d204_hdr    hdr;    /* 64 byte header */
 400         char                    buf[];  /* d204 buffer */
 401 } __attribute__ ((packed));
 402
 403 static int dbfs_d204_create(void **data, void **data_free_ptr, size_t *size)
 404 {
 405         struct dbfs_d204 *d204;
 406         int rc, buf_size;
 407         void *base;
 408
 409         buf_size = PAGE_SIZE * (diag204_buf_pages + 1) + sizeof(d204->hdr);
 410         base = vzalloc(buf_size);
 411         if (!base)
 412                 return -ENOMEM;
 413         d204 = page_align_ptr(base + sizeof(d204->hdr)) - sizeof(d204->hdr);
 414         rc = diag204_do_store(d204->buf, diag204_buf_pages);
 415         if (rc) {
 416                 vfree(base);
 417                 return rc;
 418         }
 419         d204->hdr.version = DBFS_D204_HDR_VERSION;
 420         d204->hdr.len = PAGE_SIZE * diag204_buf_pages;
 421         d204->hdr.sc = diag204_store_sc;
 422         *data = d204;
 423         *data_free_ptr = base;
 424         *size = d204->hdr.len + sizeof(struct dbfs_d204_hdr);
 425         return 0;
 426 }
 427
 428 static struct hypfs_dbfs_file dbfs_file_d204 = {
 429         .name           = "diag_204",
 430         .data_create    = dbfs_d204_create,
 431         .data_free      = vfree,
 432 };
 433
 434 __init int hypfs_diag_init(void)
 435 {
 436         int rc;
 437
 438         if (diag204_probe()) {
 439                 pr_err("The hardware system does not support hypfs\n");
 440                 return -ENODATA;
 441         }
 442         if (diag204_info_type == DIAG204_INFO_EXT) {
 443                 rc = hypfs_dbfs_create_file(&dbfs_file_d204);
 444                 if (rc)
 445                         return rc;
 446         }
 447         if (MACHINE_IS_LPAR) {
 448                 rc = diag224_get_name_table();
 449                 if (rc) {
 450                         pr_err("The hardware system does not provide all "
 451                                "functions required by hypfs\n");
 452                         debugfs_remove(dbfs_d204_file);
 453                         return rc;
 454                 }
 455         }
 456         return 0;
 457 }
 458
 459 void hypfs_diag_exit(void)
 460 {
 461         debugfs_remove(dbfs_d204_file);
 462         diag224_delete_name_table();
 463         diag204_free_buffer();
 464         hypfs_dbfs_remove_file(&dbfs_file_d204);
 465 }
 466
 467 /*
 468  * Functions to create the directory structure
 469  * *******************************************
 470  */
 471
 472 static int hypfs_create_cpu_files(struct dentry *cpus_dir, void *cpu_info)
 473 {
 474         struct dentry *cpu_dir;
 475         char buffer[TMP_SIZE];
 476         void *rc;
 477
 478         snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
 479                                                             cpu_info));
 480         cpu_dir = hypfs_mkdir(cpus_dir, buffer);
 481         rc = hypfs_create_u64(cpu_dir, "mgmtime",
 482                               cpu_info__acc_time(diag204_info_type, cpu_info) -
 483                               cpu_info__lp_time(diag204_info_type, cpu_info));
 484         if (IS_ERR(rc))
 485                 return PTR_ERR(rc);
 486         rc = hypfs_create_u64(cpu_dir, "cputime",
 487                               cpu_info__lp_time(diag204_info_type, cpu_info));
 488         if (IS_ERR(rc))
 489                 return PTR_ERR(rc);
 490         if (diag204_info_type == DIAG204_INFO_EXT) {
 491                 rc = hypfs_create_u64(cpu_dir, "onlinetime",
 492                                       cpu_info__online_time(diag204_info_type,
 493                                                             cpu_info));
 494                 if (IS_ERR(rc))
 495                         return PTR_ERR(rc);
 496         }
 497         diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
 498         rc = hypfs_create_str(cpu_dir, "type", buffer);
 499         return PTR_RET(rc);
 500 }
 501
 502 static void *hypfs_create_lpar_files(struct dentry *systems_dir, void *part_hdr)
 503 {
 504         struct dentry *cpus_dir;
 505         struct dentry *lpar_dir;
 506         char lpar_name[DIAG204_LPAR_NAME_LEN + 1];
 507         void *cpu_info;
 508         int i;
 509
 510         part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
 511         lpar_name[DIAG204_LPAR_NAME_LEN] = 0;
 512         lpar_dir = hypfs_mkdir(systems_dir, lpar_name);
 513         if (IS_ERR(lpar_dir))
 514                 return lpar_dir;
 515         cpus_dir = hypfs_mkdir(lpar_dir, "cpus");
 516         if (IS_ERR(cpus_dir))
 517                 return cpus_dir;
 518         cpu_info = part_hdr + part_hdr__size(diag204_info_type);
 519         for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
 520                 int rc;
 521                 rc = hypfs_create_cpu_files(cpus_dir, cpu_info);
 522                 if (rc)
 523                         return ERR_PTR(rc);
 524                 cpu_info += cpu_info__size(diag204_info_type);
 525         }
 526         return cpu_info;
 527 }
 528
 529 static int hypfs_create_phys_cpu_files(struct dentry *cpus_dir, void *cpu_info)
 530 {
 531         struct dentry *cpu_dir;
 532         char buffer[TMP_SIZE];
 533         void *rc;
 534
 535         snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
 536                                                             cpu_info));
 537         cpu_dir = hypfs_mkdir(cpus_dir, buffer);
 538         if (IS_ERR(cpu_dir))
 539                 return PTR_ERR(cpu_dir);
 540         rc = hypfs_create_u64(cpu_dir, "mgmtime",
 541                               phys_cpu__mgm_time(diag204_info_type, cpu_info));
 542         if (IS_ERR(rc))
 543                 return PTR_ERR(rc);
 544         diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
 545         rc = hypfs_create_str(cpu_dir, "type", buffer);
 546         return PTR_RET(rc);
 547 }
 548
 549 static void *hypfs_create_phys_files(struct dentry *parent_dir, void *phys_hdr)
 550 {
 551         int i;
 552         void *cpu_info;
 553         struct dentry *cpus_dir;
 554
 555         cpus_dir = hypfs_mkdir(parent_dir, "cpus");
 556         if (IS_ERR(cpus_dir))
 557                 return cpus_dir;
 558         cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
 559         for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
 560                 int rc;
 561                 rc = hypfs_create_phys_cpu_files(cpus_dir, cpu_info);
 562                 if (rc)
 563                         return ERR_PTR(rc);
 564                 cpu_info += phys_cpu__size(diag204_info_type);
 565         }
 566         return cpu_info;
 567 }
 568
 569 int hypfs_diag_create_files(struct dentry *root)
 570 {
 571         struct dentry *systems_dir, *hyp_dir;
 572         void *time_hdr, *part_hdr;
 573         int i, rc;
 574         void *buffer, *ptr;
 575
 576         buffer = diag204_store();
 577         if (IS_ERR(buffer))
 578                 return PTR_ERR(buffer);
 579
 580         systems_dir = hypfs_mkdir(root, "systems");
 581         if (IS_ERR(systems_dir)) {
 582                 rc = PTR_ERR(systems_dir);
 583                 goto err_out;
 584         }
 585         time_hdr = (struct x_info_blk_hdr *)buffer;
 586         part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
 587         for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
 588                 part_hdr = hypfs_create_lpar_files(systems_dir, part_hdr);
 589                 if (IS_ERR(part_hdr)) {
 590                         rc = PTR_ERR(part_hdr);
 591                         goto err_out;
 592                 }
 593         }
 594         if (info_blk_hdr__flags(diag204_info_type, time_hdr) &
 595             DIAG204_LPAR_PHYS_FLG) {
 596                 ptr = hypfs_create_phys_files(root, part_hdr);
 597                 if (IS_ERR(ptr)) {
 598                         rc = PTR_ERR(ptr);
 599                         goto err_out;
 600                 }
 601         }
 602         hyp_dir = hypfs_mkdir(root, "hyp");
 603         if (IS_ERR(hyp_dir)) {
 604                 rc = PTR_ERR(hyp_dir);
 605                 goto err_out;
 606         }
 607         ptr = hypfs_create_str(hyp_dir, "type", "LPAR Hypervisor");
 608         if (IS_ERR(ptr)) {
 609                 rc = PTR_ERR(ptr);
 610                 goto err_out;
 611         }
 612         rc = 0;
 613
 614 err_out:
 615         return rc;
 616 }