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