1 /* 2 * arch/s390/hypfs/hypfs_diag.c 3 * Hypervisor filesystem for Linux on s390. Diag 204 and 224 4 * implementation. 5 * 6 * Copyright IBM Corp. 2006, 2008 7 * Author(s): Michael Holzheu <holzheu@de.ibm.com> 8 */ 9 10 #define KMSG_COMPONENT "hypfs" 11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 12 13 #include <linux/types.h> 14 #include <linux/errno.h> 15 #include <linux/gfp.h> 16 #include <linux/slab.h> 17 #include <linux/string.h> 18 #include <linux/vmalloc.h> 19 #include <asm/ebcdic.h> 20 #include "hypfs.h" 21 22 #define LPAR_NAME_LEN 8 /* lpar name len in diag 204 data */ 23 #define CPU_NAME_LEN 16 /* type name len of cpus in diag224 name table */ 24 #define TMP_SIZE 64 /* size of temporary buffers */ 25 26 /* diag 204 subcodes */ 27 enum diag204_sc { 28 SUBC_STIB4 = 4, 29 SUBC_RSI = 5, 30 SUBC_STIB6 = 6, 31 SUBC_STIB7 = 7 32 }; 33 34 /* The two available diag 204 data formats */ 35 enum diag204_format { 36 INFO_SIMPLE = 0, 37 INFO_EXT = 0x00010000 38 }; 39 40 /* bit is set in flags, when physical cpu info is included in diag 204 data */ 41 #define LPAR_PHYS_FLG 0x80 42 43 static char *diag224_cpu_names; /* diag 224 name table */ 44 static enum diag204_sc diag204_store_sc; /* used subcode for store */ 45 static enum diag204_format diag204_info_type; /* used diag 204 data format */ 46 47 static void *diag204_buf; /* 4K aligned buffer for diag204 data */ 48 static void *diag204_buf_vmalloc; /* vmalloc pointer for diag204 data */ 49 static int diag204_buf_pages; /* number of pages for diag204 data */ 50 51 /* 52 * DIAG 204 data structures and member access functions. 53 * 54 * Since we have two different diag 204 data formats for old and new s390 55 * machines, we do not access the structs directly, but use getter functions for 56 * each struct member instead. This should make the code more readable. 57 */ 58 59 /* Time information block */ 60 61 struct info_blk_hdr { 62 __u8 npar; 63 __u8 flags; 64 __u16 tslice; 65 __u16 phys_cpus; 66 __u16 this_part; 67 __u64 curtod; 68 } __attribute__ ((packed)); 69 70 struct x_info_blk_hdr { 71 __u8 npar; 72 __u8 flags; 73 __u16 tslice; 74 __u16 phys_cpus; 75 __u16 this_part; 76 __u64 curtod1; 77 __u64 curtod2; 78 char reserved[40]; 79 } __attribute__ ((packed)); 80 81 static inline int info_blk_hdr__size(enum diag204_format type) 82 { 83 if (type == INFO_SIMPLE) 84 return sizeof(struct info_blk_hdr); 85 else /* INFO_EXT */ 86 return sizeof(struct x_info_blk_hdr); 87 } 88 89 static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr) 90 { 91 if (type == INFO_SIMPLE) 92 return ((struct info_blk_hdr *)hdr)->npar; 93 else /* INFO_EXT */ 94 return ((struct x_info_blk_hdr *)hdr)->npar; 95 } 96 97 static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr) 98 { 99 if (type == INFO_SIMPLE) 100 return ((struct info_blk_hdr *)hdr)->flags; 101 else /* INFO_EXT */ 102 return ((struct x_info_blk_hdr *)hdr)->flags; 103 } 104 105 static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr) 106 { 107 if (type == INFO_SIMPLE) 108 return ((struct info_blk_hdr *)hdr)->phys_cpus; 109 else /* INFO_EXT */ 110 return ((struct x_info_blk_hdr *)hdr)->phys_cpus; 111 } 112 113 /* Partition header */ 114 115 struct part_hdr { 116 __u8 pn; 117 __u8 cpus; 118 char reserved[6]; 119 char part_name[LPAR_NAME_LEN]; 120 } __attribute__ ((packed)); 121 122 struct x_part_hdr { 123 __u8 pn; 124 __u8 cpus; 125 __u8 rcpus; 126 __u8 pflag; 127 __u32 mlu; 128 char part_name[LPAR_NAME_LEN]; 129 char lpc_name[8]; 130 char os_name[8]; 131 __u64 online_cs; 132 __u64 online_es; 133 __u8 upid; 134 char reserved1[3]; 135 __u32 group_mlu; 136 char group_name[8]; 137 char reserved2[32]; 138 } __attribute__ ((packed)); 139 140 static inline int part_hdr__size(enum diag204_format type) 141 { 142 if (type == INFO_SIMPLE) 143 return sizeof(struct part_hdr); 144 else /* INFO_EXT */ 145 return sizeof(struct x_part_hdr); 146 } 147 148 static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr) 149 { 150 if (type == INFO_SIMPLE) 151 return ((struct part_hdr *)hdr)->cpus; 152 else /* INFO_EXT */ 153 return ((struct x_part_hdr *)hdr)->rcpus; 154 } 155 156 static inline void part_hdr__part_name(enum diag204_format type, void *hdr, 157 char *name) 158 { 159 if (type == INFO_SIMPLE) 160 memcpy(name, ((struct part_hdr *)hdr)->part_name, 161 LPAR_NAME_LEN); 162 else /* INFO_EXT */ 163 memcpy(name, ((struct x_part_hdr *)hdr)->part_name, 164 LPAR_NAME_LEN); 165 EBCASC(name, LPAR_NAME_LEN); 166 name[LPAR_NAME_LEN] = 0; 167 strstrip(name); 168 } 169 170 struct cpu_info { 171 __u16 cpu_addr; 172 char reserved1[2]; 173 __u8 ctidx; 174 __u8 cflag; 175 __u16 weight; 176 __u64 acc_time; 177 __u64 lp_time; 178 } __attribute__ ((packed)); 179 180 struct x_cpu_info { 181 __u16 cpu_addr; 182 char reserved1[2]; 183 __u8 ctidx; 184 __u8 cflag; 185 __u16 weight; 186 __u64 acc_time; 187 __u64 lp_time; 188 __u16 min_weight; 189 __u16 cur_weight; 190 __u16 max_weight; 191 char reseved2[2]; 192 __u64 online_time; 193 __u64 wait_time; 194 __u32 pma_weight; 195 __u32 polar_weight; 196 char reserved3[40]; 197 } __attribute__ ((packed)); 198 199 /* CPU info block */ 200 201 static inline int cpu_info__size(enum diag204_format type) 202 { 203 if (type == INFO_SIMPLE) 204 return sizeof(struct cpu_info); 205 else /* INFO_EXT */ 206 return sizeof(struct x_cpu_info); 207 } 208 209 static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr) 210 { 211 if (type == INFO_SIMPLE) 212 return ((struct cpu_info *)hdr)->ctidx; 213 else /* INFO_EXT */ 214 return ((struct x_cpu_info *)hdr)->ctidx; 215 } 216 217 static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr) 218 { 219 if (type == INFO_SIMPLE) 220 return ((struct cpu_info *)hdr)->cpu_addr; 221 else /* INFO_EXT */ 222 return ((struct x_cpu_info *)hdr)->cpu_addr; 223 } 224 225 static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr) 226 { 227 if (type == INFO_SIMPLE) 228 return ((struct cpu_info *)hdr)->acc_time; 229 else /* INFO_EXT */ 230 return ((struct x_cpu_info *)hdr)->acc_time; 231 } 232 233 static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr) 234 { 235 if (type == INFO_SIMPLE) 236 return ((struct cpu_info *)hdr)->lp_time; 237 else /* INFO_EXT */ 238 return ((struct x_cpu_info *)hdr)->lp_time; 239 } 240 241 static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr) 242 { 243 if (type == INFO_SIMPLE) 244 return 0; /* online_time not available in simple info */ 245 else /* INFO_EXT */ 246 return ((struct x_cpu_info *)hdr)->online_time; 247 } 248 249 /* Physical header */ 250 251 struct phys_hdr { 252 char reserved1[1]; 253 __u8 cpus; 254 char reserved2[6]; 255 char mgm_name[8]; 256 } __attribute__ ((packed)); 257 258 struct x_phys_hdr { 259 char reserved1[1]; 260 __u8 cpus; 261 char reserved2[6]; 262 char mgm_name[8]; 263 char reserved3[80]; 264 } __attribute__ ((packed)); 265 266 static inline int phys_hdr__size(enum diag204_format type) 267 { 268 if (type == INFO_SIMPLE) 269 return sizeof(struct phys_hdr); 270 else /* INFO_EXT */ 271 return sizeof(struct x_phys_hdr); 272 } 273 274 static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr) 275 { 276 if (type == INFO_SIMPLE) 277 return ((struct phys_hdr *)hdr)->cpus; 278 else /* INFO_EXT */ 279 return ((struct x_phys_hdr *)hdr)->cpus; 280 } 281 282 /* Physical CPU info block */ 283 284 struct phys_cpu { 285 __u16 cpu_addr; 286 char reserved1[2]; 287 __u8 ctidx; 288 char reserved2[3]; 289 __u64 mgm_time; 290 char reserved3[8]; 291 } __attribute__ ((packed)); 292 293 struct x_phys_cpu { 294 __u16 cpu_addr; 295 char reserved1[2]; 296 __u8 ctidx; 297 char reserved2[3]; 298 __u64 mgm_time; 299 char reserved3[80]; 300 } __attribute__ ((packed)); 301 302 static inline int phys_cpu__size(enum diag204_format type) 303 { 304 if (type == INFO_SIMPLE) 305 return sizeof(struct phys_cpu); 306 else /* INFO_EXT */ 307 return sizeof(struct x_phys_cpu); 308 } 309 310 static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr) 311 { 312 if (type == INFO_SIMPLE) 313 return ((struct phys_cpu *)hdr)->cpu_addr; 314 else /* INFO_EXT */ 315 return ((struct x_phys_cpu *)hdr)->cpu_addr; 316 } 317 318 static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr) 319 { 320 if (type == INFO_SIMPLE) 321 return ((struct phys_cpu *)hdr)->mgm_time; 322 else /* INFO_EXT */ 323 return ((struct x_phys_cpu *)hdr)->mgm_time; 324 } 325 326 static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr) 327 { 328 if (type == INFO_SIMPLE) 329 return ((struct phys_cpu *)hdr)->ctidx; 330 else /* INFO_EXT */ 331 return ((struct x_phys_cpu *)hdr)->ctidx; 332 } 333 334 /* Diagnose 204 functions */ 335 336 static int diag204(unsigned long subcode, unsigned long size, void *addr) 337 { 338 register unsigned long _subcode asm("0") = subcode; 339 register unsigned long _size asm("1") = size; 340 341 asm volatile( 342 " diag %2,%0,0x204\n" 343 "0:\n" 344 EX_TABLE(0b,0b) 345 : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory"); 346 if (_subcode) 347 return -1; 348 return _size; 349 } 350 351 /* 352 * For the old diag subcode 4 with simple data format we have to use real 353 * memory. If we use subcode 6 or 7 with extended data format, we can (and 354 * should) use vmalloc, since we need a lot of memory in that case. Currently 355 * up to 93 pages! 356 */ 357 358 static void diag204_free_buffer(void) 359 { 360 if (!diag204_buf) 361 return; 362 if (diag204_buf_vmalloc) { 363 vfree(diag204_buf_vmalloc); 364 diag204_buf_vmalloc = NULL; 365 } else { 366 free_pages((unsigned long) diag204_buf, 0); 367 } 368 diag204_buf_pages = 0; 369 diag204_buf = NULL; 370 } 371 372 static void *diag204_alloc_vbuf(int pages) 373 { 374 /* The buffer has to be page aligned! */ 375 diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1)); 376 if (!diag204_buf_vmalloc) 377 return ERR_PTR(-ENOMEM); 378 diag204_buf = (void*)((unsigned long)diag204_buf_vmalloc 379 & ~0xfffUL) + 0x1000; 380 diag204_buf_pages = pages; 381 return diag204_buf; 382 } 383 384 static void *diag204_alloc_rbuf(void) 385 { 386 diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0); 387 if (!diag204_buf) 388 return ERR_PTR(-ENOMEM); 389 diag204_buf_pages = 1; 390 return diag204_buf; 391 } 392 393 static void *diag204_get_buffer(enum diag204_format fmt, int *pages) 394 { 395 if (diag204_buf) { 396 *pages = diag204_buf_pages; 397 return diag204_buf; 398 } 399 if (fmt == INFO_SIMPLE) { 400 *pages = 1; 401 return diag204_alloc_rbuf(); 402 } else {/* INFO_EXT */ 403 *pages = diag204((unsigned long)SUBC_RSI | 404 (unsigned long)INFO_EXT, 0, NULL); 405 if (*pages <= 0) 406 return ERR_PTR(-ENOSYS); 407 else 408 return diag204_alloc_vbuf(*pages); 409 } 410 } 411 412 /* 413 * diag204_probe() has to find out, which type of diagnose 204 implementation 414 * we have on our machine. Currently there are three possible scanarios: 415 * - subcode 4 + simple data format (only one page) 416 * - subcode 4-6 + extended data format 417 * - subcode 4-7 + extended data format 418 * 419 * Subcode 5 is used to retrieve the size of the data, provided by subcodes 420 * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition 421 * to subcode 6 it provides also information about secondary cpus. 422 * In order to get as much information as possible, we first try 423 * subcode 7, then 6 and if both fail, we use subcode 4. 424 */ 425 426 static int diag204_probe(void) 427 { 428 void *buf; 429 int pages, rc; 430 431 buf = diag204_get_buffer(INFO_EXT, &pages); 432 if (!IS_ERR(buf)) { 433 if (diag204((unsigned long)SUBC_STIB7 | 434 (unsigned long)INFO_EXT, pages, buf) >= 0) { 435 diag204_store_sc = SUBC_STIB7; 436 diag204_info_type = INFO_EXT; 437 goto out; 438 } 439 if (diag204((unsigned long)SUBC_STIB6 | 440 (unsigned long)INFO_EXT, pages, buf) >= 0) { 441 diag204_store_sc = SUBC_STIB7; 442 diag204_info_type = INFO_EXT; 443 goto out; 444 } 445 diag204_free_buffer(); 446 } 447 448 /* subcodes 6 and 7 failed, now try subcode 4 */ 449 450 buf = diag204_get_buffer(INFO_SIMPLE, &pages); 451 if (IS_ERR(buf)) { 452 rc = PTR_ERR(buf); 453 goto fail_alloc; 454 } 455 if (diag204((unsigned long)SUBC_STIB4 | 456 (unsigned long)INFO_SIMPLE, pages, buf) >= 0) { 457 diag204_store_sc = SUBC_STIB4; 458 diag204_info_type = INFO_SIMPLE; 459 goto out; 460 } else { 461 rc = -ENOSYS; 462 goto fail_store; 463 } 464 out: 465 rc = 0; 466 fail_store: 467 diag204_free_buffer(); 468 fail_alloc: 469 return rc; 470 } 471 472 static void *diag204_store(void) 473 { 474 void *buf; 475 int pages; 476 477 buf = diag204_get_buffer(diag204_info_type, &pages); 478 if (IS_ERR(buf)) 479 goto out; 480 if (diag204((unsigned long)diag204_store_sc | 481 (unsigned long)diag204_info_type, pages, buf) < 0) 482 return ERR_PTR(-ENOSYS); 483 out: 484 return buf; 485 } 486 487 /* Diagnose 224 functions */ 488 489 static int diag224(void *ptr) 490 { 491 int rc = -ENOTSUPP; 492 493 asm volatile( 494 " diag %1,%2,0x224\n" 495 "0: lhi %0,0x0\n" 496 "1:\n" 497 EX_TABLE(0b,1b) 498 : "+d" (rc) :"d" (0), "d" (ptr) : "memory"); 499 return rc; 500 } 501 502 static int diag224_get_name_table(void) 503 { 504 /* memory must be below 2GB */ 505 diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA); 506 if (!diag224_cpu_names) 507 return -ENOMEM; 508 if (diag224(diag224_cpu_names)) { 509 kfree(diag224_cpu_names); 510 return -ENOTSUPP; 511 } 512 EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16); 513 return 0; 514 } 515 516 static void diag224_delete_name_table(void) 517 { 518 kfree(diag224_cpu_names); 519 } 520 521 static int diag224_idx2name(int index, char *name) 522 { 523 memcpy(name, diag224_cpu_names + ((index + 1) * CPU_NAME_LEN), 524 CPU_NAME_LEN); 525 name[CPU_NAME_LEN] = 0; 526 strstrip(name); 527 return 0; 528 } 529 530 __init int hypfs_diag_init(void) 531 { 532 int rc; 533 534 if (diag204_probe()) { 535 pr_err("The hardware system does not support hypfs\n"); 536 return -ENODATA; 537 } 538 rc = diag224_get_name_table(); 539 if (rc) { 540 diag204_free_buffer(); 541 pr_err("The hardware system does not provide all " 542 "functions required by hypfs\n"); 543 } 544 return rc; 545 } 546 547 void hypfs_diag_exit(void) 548 { 549 diag224_delete_name_table(); 550 diag204_free_buffer(); 551 } 552 553 /* 554 * Functions to create the directory structure 555 * ******************************************* 556 */ 557 558 static int hypfs_create_cpu_files(struct super_block *sb, 559 struct dentry *cpus_dir, void *cpu_info) 560 { 561 struct dentry *cpu_dir; 562 char buffer[TMP_SIZE]; 563 void *rc; 564 565 snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type, 566 cpu_info)); 567 cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer); 568 rc = hypfs_create_u64(sb, cpu_dir, "mgmtime", 569 cpu_info__acc_time(diag204_info_type, cpu_info) - 570 cpu_info__lp_time(diag204_info_type, cpu_info)); 571 if (IS_ERR(rc)) 572 return PTR_ERR(rc); 573 rc = hypfs_create_u64(sb, cpu_dir, "cputime", 574 cpu_info__lp_time(diag204_info_type, cpu_info)); 575 if (IS_ERR(rc)) 576 return PTR_ERR(rc); 577 if (diag204_info_type == INFO_EXT) { 578 rc = hypfs_create_u64(sb, cpu_dir, "onlinetime", 579 cpu_info__online_time(diag204_info_type, 580 cpu_info)); 581 if (IS_ERR(rc)) 582 return PTR_ERR(rc); 583 } 584 diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer); 585 rc = hypfs_create_str(sb, cpu_dir, "type", buffer); 586 if (IS_ERR(rc)) 587 return PTR_ERR(rc); 588 return 0; 589 } 590 591 static void *hypfs_create_lpar_files(struct super_block *sb, 592 struct dentry *systems_dir, void *part_hdr) 593 { 594 struct dentry *cpus_dir; 595 struct dentry *lpar_dir; 596 char lpar_name[LPAR_NAME_LEN + 1]; 597 void *cpu_info; 598 int i; 599 600 part_hdr__part_name(diag204_info_type, part_hdr, lpar_name); 601 lpar_name[LPAR_NAME_LEN] = 0; 602 lpar_dir = hypfs_mkdir(sb, systems_dir, lpar_name); 603 if (IS_ERR(lpar_dir)) 604 return lpar_dir; 605 cpus_dir = hypfs_mkdir(sb, lpar_dir, "cpus"); 606 if (IS_ERR(cpus_dir)) 607 return cpus_dir; 608 cpu_info = part_hdr + part_hdr__size(diag204_info_type); 609 for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) { 610 int rc; 611 rc = hypfs_create_cpu_files(sb, cpus_dir, cpu_info); 612 if (rc) 613 return ERR_PTR(rc); 614 cpu_info += cpu_info__size(diag204_info_type); 615 } 616 return cpu_info; 617 } 618 619 static int hypfs_create_phys_cpu_files(struct super_block *sb, 620 struct dentry *cpus_dir, void *cpu_info) 621 { 622 struct dentry *cpu_dir; 623 char buffer[TMP_SIZE]; 624 void *rc; 625 626 snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type, 627 cpu_info)); 628 cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer); 629 if (IS_ERR(cpu_dir)) 630 return PTR_ERR(cpu_dir); 631 rc = hypfs_create_u64(sb, cpu_dir, "mgmtime", 632 phys_cpu__mgm_time(diag204_info_type, cpu_info)); 633 if (IS_ERR(rc)) 634 return PTR_ERR(rc); 635 diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer); 636 rc = hypfs_create_str(sb, cpu_dir, "type", buffer); 637 if (IS_ERR(rc)) 638 return PTR_ERR(rc); 639 return 0; 640 } 641 642 static void *hypfs_create_phys_files(struct super_block *sb, 643 struct dentry *parent_dir, void *phys_hdr) 644 { 645 int i; 646 void *cpu_info; 647 struct dentry *cpus_dir; 648 649 cpus_dir = hypfs_mkdir(sb, parent_dir, "cpus"); 650 if (IS_ERR(cpus_dir)) 651 return cpus_dir; 652 cpu_info = phys_hdr + phys_hdr__size(diag204_info_type); 653 for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) { 654 int rc; 655 rc = hypfs_create_phys_cpu_files(sb, cpus_dir, cpu_info); 656 if (rc) 657 return ERR_PTR(rc); 658 cpu_info += phys_cpu__size(diag204_info_type); 659 } 660 return cpu_info; 661 } 662 663 int hypfs_diag_create_files(struct super_block *sb, struct dentry *root) 664 { 665 struct dentry *systems_dir, *hyp_dir; 666 void *time_hdr, *part_hdr; 667 int i, rc; 668 void *buffer, *ptr; 669 670 buffer = diag204_store(); 671 if (IS_ERR(buffer)) 672 return PTR_ERR(buffer); 673 674 systems_dir = hypfs_mkdir(sb, root, "systems"); 675 if (IS_ERR(systems_dir)) { 676 rc = PTR_ERR(systems_dir); 677 goto err_out; 678 } 679 time_hdr = (struct x_info_blk_hdr *)buffer; 680 part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type); 681 for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) { 682 part_hdr = hypfs_create_lpar_files(sb, systems_dir, part_hdr); 683 if (IS_ERR(part_hdr)) { 684 rc = PTR_ERR(part_hdr); 685 goto err_out; 686 } 687 } 688 if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) { 689 ptr = hypfs_create_phys_files(sb, root, part_hdr); 690 if (IS_ERR(ptr)) { 691 rc = PTR_ERR(ptr); 692 goto err_out; 693 } 694 } 695 hyp_dir = hypfs_mkdir(sb, root, "hyp"); 696 if (IS_ERR(hyp_dir)) { 697 rc = PTR_ERR(hyp_dir); 698 goto err_out; 699 } 700 ptr = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor"); 701 if (IS_ERR(ptr)) { 702 rc = PTR_ERR(ptr); 703 goto err_out; 704 } 705 rc = 0; 706 707 err_out: 708 return rc; 709 } 710