arch/s390/hypfs/hypfs_diag.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *    Hypervisor filesystem for Linux on s390. Diag 204 and 224
   4  *    implementation.
   5  *
   6  *    Copyright IBM Corp. 2006, 2008
   7  *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
   8  */
   9
  10 #define KMSG_COMPONENT "hypfs"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/types.h>
  14 #include <linux/errno.h>
  15 #include <linux/slab.h>
  16 #include <linux/string.h>
  17 #include <linux/vmalloc.h>
  18 #include <linux/mm.h>
  19 #include <asm/diag.h>
  20 #include <asm/ebcdic.h>
  21 #include "hypfs.h"
  22
  23 #define TMP_SIZE 64             /* size of temporary buffers */
  24
  25 #define DBFS_D204_HDR_VERSION   0
  26
  27 static char *diag224_cpu_names;                 /* diag 224 name table */
  28 static enum diag204_sc diag204_store_sc;        /* used subcode for store */
  29 static enum diag204_format diag204_info_type;   /* used diag 204 data format */
  30
  31 static void *diag204_buf;               /* 4K aligned buffer for diag204 data */
  32 static void *diag204_buf_vmalloc;       /* vmalloc pointer for diag204 data */
  33 static int diag204_buf_pages;           /* number of pages for diag204 data */
  34
  35 static struct dentry *dbfs_d204_file;
  36
  37 /*
  38  * DIAG 204 member access functions.
  39  *
  40  * Since we have two different diag 204 data formats for old and new s390
  41  * machines, we do not access the structs directly, but use getter functions for
  42  * each struct member instead. This should make the code more readable.
  43  */
  44
  45 /* Time information block */
  46
  47 static inline int info_blk_hdr__size(enum diag204_format type)
  48 {
  49         if (type == DIAG204_INFO_SIMPLE)
  50                 return sizeof(struct diag204_info_blk_hdr);
  51         else /* DIAG204_INFO_EXT */
  52                 return sizeof(struct diag204_x_info_blk_hdr);
  53 }
  54
  55 static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
  56 {
  57         if (type == DIAG204_INFO_SIMPLE)
  58                 return ((struct diag204_info_blk_hdr *)hdr)->npar;
  59         else /* DIAG204_INFO_EXT */
  60                 return ((struct diag204_x_info_blk_hdr *)hdr)->npar;
  61 }
  62
  63 static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
  64 {
  65         if (type == DIAG204_INFO_SIMPLE)
  66                 return ((struct diag204_info_blk_hdr *)hdr)->flags;
  67         else /* DIAG204_INFO_EXT */
  68                 return ((struct diag204_x_info_blk_hdr *)hdr)->flags;
  69 }
  70
  71 static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
  72 {
  73         if (type == DIAG204_INFO_SIMPLE)
  74                 return ((struct diag204_info_blk_hdr *)hdr)->phys_cpus;
  75         else /* DIAG204_INFO_EXT */
  76                 return ((struct diag204_x_info_blk_hdr *)hdr)->phys_cpus;
  77 }
  78
  79 /* Partition header */
  80
  81 static inline int part_hdr__size(enum diag204_format type)
  82 {
  83         if (type == DIAG204_INFO_SIMPLE)
  84                 return sizeof(struct diag204_part_hdr);
  85         else /* DIAG204_INFO_EXT */
  86                 return sizeof(struct diag204_x_part_hdr);
  87 }
  88
  89 static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
  90 {
  91         if (type == DIAG204_INFO_SIMPLE)
  92                 return ((struct diag204_part_hdr *)hdr)->cpus;
  93         else /* DIAG204_INFO_EXT */
  94                 return ((struct diag204_x_part_hdr *)hdr)->rcpus;
  95 }
  96
  97 static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
  98                                        char *name)
  99 {
 100         if (type == DIAG204_INFO_SIMPLE)
 101                 memcpy(name, ((struct diag204_part_hdr *)hdr)->part_name,
 102                        DIAG204_LPAR_NAME_LEN);
 103         else /* DIAG204_INFO_EXT */
 104                 memcpy(name, ((struct diag204_x_part_hdr *)hdr)->part_name,
 105                        DIAG204_LPAR_NAME_LEN);
 106         EBCASC(name, DIAG204_LPAR_NAME_LEN);
 107         name[DIAG204_LPAR_NAME_LEN] = 0;
 108         strim(name);
 109 }
 110
 111 /* CPU info block */
 112
 113 static inline int cpu_info__size(enum diag204_format type)
 114 {
 115         if (type == DIAG204_INFO_SIMPLE)
 116                 return sizeof(struct diag204_cpu_info);
 117         else /* DIAG204_INFO_EXT */
 118                 return sizeof(struct diag204_x_cpu_info);
 119 }
 120
 121 static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
 122 {
 123         if (type == DIAG204_INFO_SIMPLE)
 124                 return ((struct diag204_cpu_info *)hdr)->ctidx;
 125         else /* DIAG204_INFO_EXT */
 126                 return ((struct diag204_x_cpu_info *)hdr)->ctidx;
 127 }
 128
 129 static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
 130 {
 131         if (type == DIAG204_INFO_SIMPLE)
 132                 return ((struct diag204_cpu_info *)hdr)->cpu_addr;
 133         else /* DIAG204_INFO_EXT */
 134                 return ((struct diag204_x_cpu_info *)hdr)->cpu_addr;
 135 }
 136
 137 static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
 138 {
 139         if (type == DIAG204_INFO_SIMPLE)
 140                 return ((struct diag204_cpu_info *)hdr)->acc_time;
 141         else /* DIAG204_INFO_EXT */
 142                 return ((struct diag204_x_cpu_info *)hdr)->acc_time;
 143 }
 144
 145 static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
 146 {
 147         if (type == DIAG204_INFO_SIMPLE)
 148                 return ((struct diag204_cpu_info *)hdr)->lp_time;
 149         else /* DIAG204_INFO_EXT */
 150                 return ((struct diag204_x_cpu_info *)hdr)->lp_time;
 151 }
 152
 153 static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
 154 {
 155         if (type == DIAG204_INFO_SIMPLE)
 156                 return 0;       /* online_time not available in simple info */
 157         else /* DIAG204_INFO_EXT */
 158                 return ((struct diag204_x_cpu_info *)hdr)->online_time;
 159 }
 160
 161 /* Physical header */
 162
 163 static inline int phys_hdr__size(enum diag204_format type)
 164 {
 165         if (type == DIAG204_INFO_SIMPLE)
 166                 return sizeof(struct diag204_phys_hdr);
 167         else /* DIAG204_INFO_EXT */
 168                 return sizeof(struct diag204_x_phys_hdr);
 169 }
 170
 171 static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
 172 {
 173         if (type == DIAG204_INFO_SIMPLE)
 174                 return ((struct diag204_phys_hdr *)hdr)->cpus;
 175         else /* DIAG204_INFO_EXT */
 176                 return ((struct diag204_x_phys_hdr *)hdr)->cpus;
 177 }
 178
 179 /* Physical CPU info block */
 180
 181 static inline int phys_cpu__size(enum diag204_format type)
 182 {
 183         if (type == DIAG204_INFO_SIMPLE)
 184                 return sizeof(struct diag204_phys_cpu);
 185         else /* DIAG204_INFO_EXT */
 186                 return sizeof(struct diag204_x_phys_cpu);
 187 }
 188
 189 static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
 190 {
 191         if (type == DIAG204_INFO_SIMPLE)
 192                 return ((struct diag204_phys_cpu *)hdr)->cpu_addr;
 193         else /* DIAG204_INFO_EXT */
 194                 return ((struct diag204_x_phys_cpu *)hdr)->cpu_addr;
 195 }
 196
 197 static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
 198 {
 199         if (type == DIAG204_INFO_SIMPLE)
 200                 return ((struct diag204_phys_cpu *)hdr)->mgm_time;
 201         else /* DIAG204_INFO_EXT */
 202                 return ((struct diag204_x_phys_cpu *)hdr)->mgm_time;
 203 }
 204
 205 static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
 206 {
 207         if (type == DIAG204_INFO_SIMPLE)
 208                 return ((struct diag204_phys_cpu *)hdr)->ctidx;
 209         else /* DIAG204_INFO_EXT */
 210                 return ((struct diag204_x_phys_cpu *)hdr)->ctidx;
 211 }
 212
 213 /* Diagnose 204 functions */
 214 /*
 215  * For the old diag subcode 4 with simple data format we have to use real
 216  * memory. If we use subcode 6 or 7 with extended data format, we can (and
 217  * should) use vmalloc, since we need a lot of memory in that case. Currently
 218  * up to 93 pages!
 219  */
 220
 221 static void diag204_free_buffer(void)
 222 {
 223         if (!diag204_buf)
 224                 return;
 225         if (diag204_buf_vmalloc) {
 226                 vfree(diag204_buf_vmalloc);
 227                 diag204_buf_vmalloc = NULL;
 228         } else {
 229                 free_pages((unsigned long) diag204_buf, 0);
 230         }
 231         diag204_buf = NULL;
 232 }
 233
 234 static void *page_align_ptr(void *ptr)
 235 {
 236         return (void *) PAGE_ALIGN((unsigned long) ptr);
 237 }
 238
 239 static void *diag204_alloc_vbuf(int pages)
 240 {
 241         /* The buffer has to be page aligned! */
 242         diag204_buf_vmalloc = vmalloc(array_size(PAGE_SIZE, (pages + 1)));
 243         if (!diag204_buf_vmalloc)
 244                 return ERR_PTR(-ENOMEM);
 245         diag204_buf = page_align_ptr(diag204_buf_vmalloc);
 246         diag204_buf_pages = pages;
 247         return diag204_buf;
 248 }
 249
 250 static void *diag204_alloc_rbuf(void)
 251 {
 252         diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
 253         if (!diag204_buf)
 254                 return ERR_PTR(-ENOMEM);
 255         diag204_buf_pages = 1;
 256         return diag204_buf;
 257 }
 258
 259 static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
 260 {
 261         if (diag204_buf) {
 262                 *pages = diag204_buf_pages;
 263                 return diag204_buf;
 264         }
 265         if (fmt == DIAG204_INFO_SIMPLE) {
 266                 *pages = 1;
 267                 return diag204_alloc_rbuf();
 268         } else {/* DIAG204_INFO_EXT */
 269                 *pages = diag204((unsigned long)DIAG204_SUBC_RSI |
 270                                  (unsigned long)DIAG204_INFO_EXT, 0, NULL);
 271                 if (*pages <= 0)
 272                         return ERR_PTR(-ENOSYS);
 273                 else
 274                         return diag204_alloc_vbuf(*pages);
 275         }
 276 }
 277
 278 /*
 279  * diag204_probe() has to find out, which type of diagnose 204 implementation
 280  * we have on our machine. Currently there are three possible scanarios:
 281  *   - subcode 4   + simple data format (only one page)
 282  *   - subcode 4-6 + extended data format
 283  *   - subcode 4-7 + extended data format
 284  *
 285  * Subcode 5 is used to retrieve the size of the data, provided by subcodes
 286  * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
 287  * to subcode 6 it provides also information about secondary cpus.
 288  * In order to get as much information as possible, we first try
 289  * subcode 7, then 6 and if both fail, we use subcode 4.
 290  */
 291
 292 static int diag204_probe(void)
 293 {
 294         void *buf;
 295         int pages, rc;
 296
 297         buf = diag204_get_buffer(DIAG204_INFO_EXT, &pages);
 298         if (!IS_ERR(buf)) {
 299                 if (diag204((unsigned long)DIAG204_SUBC_STIB7 |
 300                             (unsigned long)DIAG204_INFO_EXT, pages, buf) >= 0) {
 301                         diag204_store_sc = DIAG204_SUBC_STIB7;
 302                         diag204_info_type = DIAG204_INFO_EXT;
 303                         goto out;
 304                 }
 305                 if (diag204((unsigned long)DIAG204_SUBC_STIB6 |
 306                             (unsigned long)DIAG204_INFO_EXT, pages, buf) >= 0) {
 307                         diag204_store_sc = DIAG204_SUBC_STIB6;
 308                         diag204_info_type = DIAG204_INFO_EXT;
 309                         goto out;
 310                 }
 311                 diag204_free_buffer();
 312         }
 313
 314         /* subcodes 6 and 7 failed, now try subcode 4 */
 315
 316         buf = diag204_get_buffer(DIAG204_INFO_SIMPLE, &pages);
 317         if (IS_ERR(buf)) {
 318                 rc = PTR_ERR(buf);
 319                 goto fail_alloc;
 320         }
 321         if (diag204((unsigned long)DIAG204_SUBC_STIB4 |
 322                     (unsigned long)DIAG204_INFO_SIMPLE, pages, buf) >= 0) {
 323                 diag204_store_sc = DIAG204_SUBC_STIB4;
 324                 diag204_info_type = DIAG204_INFO_SIMPLE;
 325                 goto out;
 326         } else {
 327                 rc = -ENOSYS;
 328                 goto fail_store;
 329         }
 330 out:
 331         rc = 0;
 332 fail_store:
 333         diag204_free_buffer();
 334 fail_alloc:
 335         return rc;
 336 }
 337
 338 static int diag204_do_store(void *buf, int pages)
 339 {
 340         int rc;
 341
 342         rc = diag204((unsigned long) diag204_store_sc |
 343                      (unsigned long) diag204_info_type, pages, buf);
 344         return rc < 0 ? -ENOSYS : 0;
 345 }
 346
 347 static void *diag204_store(void)
 348 {
 349         void *buf;
 350         int pages, rc;
 351
 352         buf = diag204_get_buffer(diag204_info_type, &pages);
 353         if (IS_ERR(buf))
 354                 goto out;
 355         rc = diag204_do_store(buf, pages);
 356         if (rc)
 357                 return ERR_PTR(rc);
 358 out:
 359         return buf;
 360 }
 361
 362 /* Diagnose 224 functions */
 363
 364 static int diag224_get_name_table(void)
 365 {
 366         /* memory must be below 2GB */
 367         diag224_cpu_names = (char *) __get_free_page(GFP_KERNEL | GFP_DMA);
 368         if (!diag224_cpu_names)
 369                 return -ENOMEM;
 370         if (diag224(diag224_cpu_names)) {
 371                 free_page((unsigned long) diag224_cpu_names);
 372                 return -EOPNOTSUPP;
 373         }
 374         EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
 375         return 0;
 376 }
 377
 378 static void diag224_delete_name_table(void)
 379 {
 380         free_page((unsigned long) diag224_cpu_names);
 381 }
 382
 383 static int diag224_idx2name(int index, char *name)
 384 {
 385         memcpy(name, diag224_cpu_names + ((index + 1) * DIAG204_CPU_NAME_LEN),
 386                DIAG204_CPU_NAME_LEN);
 387         name[DIAG204_CPU_NAME_LEN] = 0;
 388         strim(name);
 389         return 0;
 390 }
 391
 392 struct dbfs_d204_hdr {
 393         u64     len;            /* Length of d204 buffer without header */
 394         u16     version;        /* Version of header */
 395         u8      sc;             /* Used subcode */
 396         char    reserved[53];
 397 } __attribute__ ((packed));
 398
 399 struct dbfs_d204 {
 400         struct dbfs_d204_hdr    hdr;    /* 64 byte header */
 401         char                    buf[];  /* d204 buffer */
 402 } __attribute__ ((packed));
 403
 404 static int dbfs_d204_create(void **data, void **data_free_ptr, size_t *size)
 405 {
 406         struct dbfs_d204 *d204;
 407         int rc, buf_size;
 408         void *base;
 409
 410         buf_size = PAGE_SIZE * (diag204_buf_pages + 1) + sizeof(d204->hdr);
 411         base = vzalloc(buf_size);
 412         if (!base)
 413                 return -ENOMEM;
 414         d204 = page_align_ptr(base + sizeof(d204->hdr)) - sizeof(d204->hdr);
 415         rc = diag204_do_store(d204->buf, diag204_buf_pages);
 416         if (rc) {
 417                 vfree(base);
 418                 return rc;
 419         }
 420         d204->hdr.version = DBFS_D204_HDR_VERSION;
 421         d204->hdr.len = PAGE_SIZE * diag204_buf_pages;
 422         d204->hdr.sc = diag204_store_sc;
 423         *data = d204;
 424         *data_free_ptr = base;
 425         *size = d204->hdr.len + sizeof(struct dbfs_d204_hdr);
 426         return 0;
 427 }
 428
 429 static struct hypfs_dbfs_file dbfs_file_d204 = {
 430         .name           = "diag_204",
 431         .data_create    = dbfs_d204_create,
 432         .data_free      = vfree,
 433 };
 434
 435 __init int hypfs_diag_init(void)
 436 {
 437         int rc;
 438
 439         if (diag204_probe()) {
 440                 pr_err("The hardware system does not support hypfs\n");
 441                 return -ENODATA;
 442         }
 443         if (diag204_info_type == DIAG204_INFO_EXT) {
 444                 rc = hypfs_dbfs_create_file(&dbfs_file_d204);
 445                 if (rc)
 446                         return rc;
 447         }
 448         if (MACHINE_IS_LPAR) {
 449                 rc = diag224_get_name_table();
 450                 if (rc) {
 451                         pr_err("The hardware system does not provide all "
 452                                "functions required by hypfs\n");
 453                         debugfs_remove(dbfs_d204_file);
 454                         return rc;
 455                 }
 456         }
 457         return 0;
 458 }
 459
 460 void hypfs_diag_exit(void)
 461 {
 462         debugfs_remove(dbfs_d204_file);
 463         diag224_delete_name_table();
 464         diag204_free_buffer();
 465         hypfs_dbfs_remove_file(&dbfs_file_d204);
 466 }
 467
 468 /*
 469  * Functions to create the directory structure
 470  * *******************************************
 471  */
 472
 473 static int hypfs_create_cpu_files(struct dentry *cpus_dir, void *cpu_info)
 474 {
 475         struct dentry *cpu_dir;
 476         char buffer[TMP_SIZE];
 477         void *rc;
 478
 479         snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
 480                                                             cpu_info));
 481         cpu_dir = hypfs_mkdir(cpus_dir, buffer);
 482         rc = hypfs_create_u64(cpu_dir, "mgmtime",
 483                               cpu_info__acc_time(diag204_info_type, cpu_info) -
 484                               cpu_info__lp_time(diag204_info_type, cpu_info));
 485         if (IS_ERR(rc))
 486                 return PTR_ERR(rc);
 487         rc = hypfs_create_u64(cpu_dir, "cputime",
 488                               cpu_info__lp_time(diag204_info_type, cpu_info));
 489         if (IS_ERR(rc))
 490                 return PTR_ERR(rc);
 491         if (diag204_info_type == DIAG204_INFO_EXT) {
 492                 rc = hypfs_create_u64(cpu_dir, "onlinetime",
 493                                       cpu_info__online_time(diag204_info_type,
 494                                                             cpu_info));
 495                 if (IS_ERR(rc))
 496                         return PTR_ERR(rc);
 497         }
 498         diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
 499         rc = hypfs_create_str(cpu_dir, "type", buffer);
 500         return PTR_RET(rc);
 501 }
 502
 503 static void *hypfs_create_lpar_files(struct dentry *systems_dir, void *part_hdr)
 504 {
 505         struct dentry *cpus_dir;
 506         struct dentry *lpar_dir;
 507         char lpar_name[DIAG204_LPAR_NAME_LEN + 1];
 508         void *cpu_info;
 509         int i;
 510
 511         part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
 512         lpar_name[DIAG204_LPAR_NAME_LEN] = 0;
 513         lpar_dir = hypfs_mkdir(systems_dir, lpar_name);
 514         if (IS_ERR(lpar_dir))
 515                 return lpar_dir;
 516         cpus_dir = hypfs_mkdir(lpar_dir, "cpus");
 517         if (IS_ERR(cpus_dir))
 518                 return cpus_dir;
 519         cpu_info = part_hdr + part_hdr__size(diag204_info_type);
 520         for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
 521                 int rc;
 522                 rc = hypfs_create_cpu_files(cpus_dir, cpu_info);
 523                 if (rc)
 524                         return ERR_PTR(rc);
 525                 cpu_info += cpu_info__size(diag204_info_type);
 526         }
 527         return cpu_info;
 528 }
 529
 530 static int hypfs_create_phys_cpu_files(struct dentry *cpus_dir, void *cpu_info)
 531 {
 532         struct dentry *cpu_dir;
 533         char buffer[TMP_SIZE];
 534         void *rc;
 535
 536         snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
 537                                                             cpu_info));
 538         cpu_dir = hypfs_mkdir(cpus_dir, buffer);
 539         if (IS_ERR(cpu_dir))
 540                 return PTR_ERR(cpu_dir);
 541         rc = hypfs_create_u64(cpu_dir, "mgmtime",
 542                               phys_cpu__mgm_time(diag204_info_type, cpu_info));
 543         if (IS_ERR(rc))
 544                 return PTR_ERR(rc);
 545         diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
 546         rc = hypfs_create_str(cpu_dir, "type", buffer);
 547         return PTR_RET(rc);
 548 }
 549
 550 static void *hypfs_create_phys_files(struct dentry *parent_dir, void *phys_hdr)
 551 {
 552         int i;
 553         void *cpu_info;
 554         struct dentry *cpus_dir;
 555
 556         cpus_dir = hypfs_mkdir(parent_dir, "cpus");
 557         if (IS_ERR(cpus_dir))
 558                 return cpus_dir;
 559         cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
 560         for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
 561                 int rc;
 562                 rc = hypfs_create_phys_cpu_files(cpus_dir, cpu_info);
 563                 if (rc)
 564                         return ERR_PTR(rc);
 565                 cpu_info += phys_cpu__size(diag204_info_type);
 566         }
 567         return cpu_info;
 568 }
 569
 570 int hypfs_diag_create_files(struct dentry *root)
 571 {
 572         struct dentry *systems_dir, *hyp_dir;
 573         void *time_hdr, *part_hdr;
 574         int i, rc;
 575         void *buffer, *ptr;
 576
 577         buffer = diag204_store();
 578         if (IS_ERR(buffer))
 579                 return PTR_ERR(buffer);
 580
 581         systems_dir = hypfs_mkdir(root, "systems");
 582         if (IS_ERR(systems_dir)) {
 583                 rc = PTR_ERR(systems_dir);
 584                 goto err_out;
 585         }
 586         time_hdr = (struct x_info_blk_hdr *)buffer;
 587         part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
 588         for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
 589                 part_hdr = hypfs_create_lpar_files(systems_dir, part_hdr);
 590                 if (IS_ERR(part_hdr)) {
 591                         rc = PTR_ERR(part_hdr);
 592                         goto err_out;
 593                 }
 594         }
 595         if (info_blk_hdr__flags(diag204_info_type, time_hdr) &
 596             DIAG204_LPAR_PHYS_FLG) {
 597                 ptr = hypfs_create_phys_files(root, part_hdr);
 598                 if (IS_ERR(ptr)) {
 599                         rc = PTR_ERR(ptr);
 600                         goto err_out;
 601                 }
 602         }
 603         hyp_dir = hypfs_mkdir(root, "hyp");
 604         if (IS_ERR(hyp_dir)) {
 605                 rc = PTR_ERR(hyp_dir);
 606                 goto err_out;
 607         }
 608         ptr = hypfs_create_str(hyp_dir, "type", "LPAR Hypervisor");
 609         if (IS_ERR(ptr)) {
 610                 rc = PTR_ERR(ptr);
 611                 goto err_out;
 612         }
 613         rc = 0;
 614
 615 err_out:
 616         return rc;
 617 }