arch/x86/kernel/cpu/microcode/amd.c

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This source file includes following definitions.
find_equiv_id
verify_container
verify_equivalence_table
__verify_patch_section
__verify_patch_size
verify_patch
parse_container
scan_containers
__apply_microcode_amd
apply_microcode_early_amd
get_builtin_microcode
__load_ucode_amd
load_ucode_amd_bsp
load_ucode_amd_ap
save_microcode_in_initrd_amd
reload_ucode_amd
__find_equiv_id
cache_find_patch
update_cache
free_cache
find_patch
collect_cpu_info_amd
apply_microcode_amd
install_equiv_cpu_table
free_equiv_cpu_table
cleanup
verify_and_add_patch
__load_microcode_amd
load_microcode_amd
request_microcode_amd
request_microcode_user
microcode_fini_cpu_amd
init_amd_microcode
exit_amd_microcode
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  AMD CPU Microcode Update Driver for Linux
   4  *
   5  *  This driver allows to upgrade microcode on F10h AMD
   6  *  CPUs and later.
   7  *
   8  *  Copyright (C) 2008-2011 Advanced Micro Devices Inc.
   9  *                2013-2018 Borislav Petkov <bp@alien8.de>
  10  *
  11  *  Author: Peter Oruba <peter.oruba@amd.com>
  12  *
  13  *  Based on work by:
  14  *  Tigran Aivazian <aivazian.tigran@gmail.com>
  15  *
  16  *  early loader:
  17  *  Copyright (C) 2013 Advanced Micro Devices, Inc.
  18  *
  19  *  Author: Jacob Shin <jacob.shin@amd.com>
  20  *  Fixes: Borislav Petkov <bp@suse.de>
  21  */
  22 #define pr_fmt(fmt) "microcode: " fmt
  23 
  24 #include <linux/earlycpio.h>
  25 #include <linux/firmware.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/initrd.h>
  29 #include <linux/kernel.h>
  30 #include <linux/pci.h>
  31 
  32 #include <asm/microcode_amd.h>
  33 #include <asm/microcode.h>
  34 #include <asm/processor.h>
  35 #include <asm/setup.h>
  36 #include <asm/cpu.h>
  37 #include <asm/msr.h>
  38 
  39 static struct equiv_cpu_table {
  40         unsigned int num_entries;
  41         struct equiv_cpu_entry *entry;
  42 } equiv_table;
  43 
  44 /*
  45  * This points to the current valid container of microcode patches which we will
  46  * save from the initrd/builtin before jettisoning its contents. @mc is the
  47  * microcode patch we found to match.
  48  */
  49 struct cont_desc {
  50         struct microcode_amd *mc;
  51         u32                  cpuid_1_eax;
  52         u32                  psize;
  53         u8                   *data;
  54         size_t               size;
  55 };
  56 
  57 static u32 ucode_new_rev;
  58 static u8 amd_ucode_patch[PATCH_MAX_SIZE];
  59 
  60 /*
  61  * Microcode patch container file is prepended to the initrd in cpio
  62  * format. See Documentation/x86/microcode.rst
  63  */
  64 static const char
  65 ucode_path[] __maybe_unused = "kernel/x86/microcode/AuthenticAMD.bin";
  66 
  67 static u16 find_equiv_id(struct equiv_cpu_table *et, u32 sig)
  68 {
  69         unsigned int i;
  70 
  71         if (!et || !et->num_entries)
  72                 return 0;
  73 
  74         for (i = 0; i < et->num_entries; i++) {
  75                 struct equiv_cpu_entry *e = &et->entry[i];
  76 
  77                 if (sig == e->installed_cpu)
  78                         return e->equiv_cpu;
  79 
  80                 e++;
  81         }
  82         return 0;
  83 }
  84 
  85 /*
  86  * Check whether there is a valid microcode container file at the beginning
  87  * of @buf of size @buf_size. Set @early to use this function in the early path.
  88  */
  89 static bool verify_container(const u8 *buf, size_t buf_size, bool early)
  90 {
  91         u32 cont_magic;
  92 
  93         if (buf_size <= CONTAINER_HDR_SZ) {
  94                 if (!early)
  95                         pr_debug("Truncated microcode container header.\n");
  96 
  97                 return false;
  98         }
  99 
 100         cont_magic = *(const u32 *)buf;
 101         if (cont_magic != UCODE_MAGIC) {
 102                 if (!early)
 103                         pr_debug("Invalid magic value (0x%08x).\n", cont_magic);
 104 
 105                 return false;
 106         }
 107 
 108         return true;
 109 }
 110 
 111 /*
 112  * Check whether there is a valid, non-truncated CPU equivalence table at the
 113  * beginning of @buf of size @buf_size. Set @early to use this function in the
 114  * early path.
 115  */
 116 static bool verify_equivalence_table(const u8 *buf, size_t buf_size, bool early)
 117 {
 118         const u32 *hdr = (const u32 *)buf;
 119         u32 cont_type, equiv_tbl_len;
 120 
 121         if (!verify_container(buf, buf_size, early))
 122                 return false;
 123 
 124         cont_type = hdr[1];
 125         if (cont_type != UCODE_EQUIV_CPU_TABLE_TYPE) {
 126                 if (!early)
 127                         pr_debug("Wrong microcode container equivalence table type: %u.\n",
 128                                cont_type);
 129 
 130                 return false;
 131         }
 132 
 133         buf_size -= CONTAINER_HDR_SZ;
 134 
 135         equiv_tbl_len = hdr[2];
 136         if (equiv_tbl_len < sizeof(struct equiv_cpu_entry) ||
 137             buf_size < equiv_tbl_len) {
 138                 if (!early)
 139                         pr_debug("Truncated equivalence table.\n");
 140 
 141                 return false;
 142         }
 143 
 144         return true;
 145 }
 146 
 147 /*
 148  * Check whether there is a valid, non-truncated microcode patch section at the
 149  * beginning of @buf of size @buf_size. Set @early to use this function in the
 150  * early path.
 151  *
 152  * On success, @sh_psize returns the patch size according to the section header,
 153  * to the caller.
 154  */
 155 static bool
 156 __verify_patch_section(const u8 *buf, size_t buf_size, u32 *sh_psize, bool early)
 157 {
 158         u32 p_type, p_size;
 159         const u32 *hdr;
 160 
 161         if (buf_size < SECTION_HDR_SIZE) {
 162                 if (!early)
 163                         pr_debug("Truncated patch section.\n");
 164 
 165                 return false;
 166         }
 167 
 168         hdr = (const u32 *)buf;
 169         p_type = hdr[0];
 170         p_size = hdr[1];
 171 
 172         if (p_type != UCODE_UCODE_TYPE) {
 173                 if (!early)
 174                         pr_debug("Invalid type field (0x%x) in container file section header.\n",
 175                                 p_type);
 176 
 177                 return false;
 178         }
 179 
 180         if (p_size < sizeof(struct microcode_header_amd)) {
 181                 if (!early)
 182                         pr_debug("Patch of size %u too short.\n", p_size);
 183 
 184                 return false;
 185         }
 186 
 187         *sh_psize = p_size;
 188 
 189         return true;
 190 }
 191 
 192 /*
 193  * Check whether the passed remaining file @buf_size is large enough to contain
 194  * a patch of the indicated @sh_psize (and also whether this size does not
 195  * exceed the per-family maximum). @sh_psize is the size read from the section
 196  * header.
 197  */
 198 static unsigned int __verify_patch_size(u8 family, u32 sh_psize, size_t buf_size)
 199 {
 200         u32 max_size;
 201 
 202         if (family >= 0x15)
 203                 return min_t(u32, sh_psize, buf_size);
 204 
 205 #define F1XH_MPB_MAX_SIZE 2048
 206 #define F14H_MPB_MAX_SIZE 1824
 207 
 208         switch (family) {
 209         case 0x10 ... 0x12:
 210                 max_size = F1XH_MPB_MAX_SIZE;
 211                 break;
 212         case 0x14:
 213                 max_size = F14H_MPB_MAX_SIZE;
 214                 break;
 215         default:
 216                 WARN(1, "%s: WTF family: 0x%x\n", __func__, family);
 217                 return 0;
 218                 break;
 219         }
 220 
 221         if (sh_psize > min_t(u32, buf_size, max_size))
 222                 return 0;
 223 
 224         return sh_psize;
 225 }
 226 
 227 /*
 228  * Verify the patch in @buf.
 229  *
 230  * Returns:
 231  * negative: on error
 232  * positive: patch is not for this family, skip it
 233  * 0: success
 234  */
 235 static int
 236 verify_patch(u8 family, const u8 *buf, size_t buf_size, u32 *patch_size, bool early)
 237 {
 238         struct microcode_header_amd *mc_hdr;
 239         unsigned int ret;
 240         u32 sh_psize;
 241         u16 proc_id;
 242         u8 patch_fam;
 243 
 244         if (!__verify_patch_section(buf, buf_size, &sh_psize, early))
 245                 return -1;
 246 
 247         /*
 248          * The section header length is not included in this indicated size
 249          * but is present in the leftover file length so we need to subtract
 250          * it before passing this value to the function below.
 251          */
 252         buf_size -= SECTION_HDR_SIZE;
 253 
 254         /*
 255          * Check if the remaining buffer is big enough to contain a patch of
 256          * size sh_psize, as the section claims.
 257          */
 258         if (buf_size < sh_psize) {
 259                 if (!early)
 260                         pr_debug("Patch of size %u truncated.\n", sh_psize);
 261 
 262                 return -1;
 263         }
 264 
 265         ret = __verify_patch_size(family, sh_psize, buf_size);
 266         if (!ret) {
 267                 if (!early)
 268                         pr_debug("Per-family patch size mismatch.\n");
 269                 return -1;
 270         }
 271 
 272         *patch_size = sh_psize;
 273 
 274         mc_hdr  = (struct microcode_header_amd *)(buf + SECTION_HDR_SIZE);
 275         if (mc_hdr->nb_dev_id || mc_hdr->sb_dev_id) {
 276                 if (!early)
 277                         pr_err("Patch-ID 0x%08x: chipset-specific code unsupported.\n", mc_hdr->patch_id);
 278                 return -1;
 279         }
 280 
 281         proc_id = mc_hdr->processor_rev_id;
 282         patch_fam = 0xf + (proc_id >> 12);
 283         if (patch_fam != family)
 284                 return 1;
 285 
 286         return 0;
 287 }
 288 
 289 /*
 290  * This scans the ucode blob for the proper container as we can have multiple
 291  * containers glued together. Returns the equivalence ID from the equivalence
 292  * table or 0 if none found.
 293  * Returns the amount of bytes consumed while scanning. @desc contains all the
 294  * data we're going to use in later stages of the application.
 295  */
 296 static size_t parse_container(u8 *ucode, size_t size, struct cont_desc *desc)
 297 {
 298         struct equiv_cpu_table table;
 299         size_t orig_size = size;
 300         u32 *hdr = (u32 *)ucode;
 301         u16 eq_id;
 302         u8 *buf;
 303 
 304         if (!verify_equivalence_table(ucode, size, true))
 305                 return 0;
 306 
 307         buf = ucode;
 308 
 309         table.entry = (struct equiv_cpu_entry *)(buf + CONTAINER_HDR_SZ);
 310         table.num_entries = hdr[2] / sizeof(struct equiv_cpu_entry);
 311 
 312         /*
 313          * Find the equivalence ID of our CPU in this table. Even if this table
 314          * doesn't contain a patch for the CPU, scan through the whole container
 315          * so that it can be skipped in case there are other containers appended.
 316          */
 317         eq_id = find_equiv_id(&table, desc->cpuid_1_eax);
 318 
 319         buf  += hdr[2] + CONTAINER_HDR_SZ;
 320         size -= hdr[2] + CONTAINER_HDR_SZ;
 321 
 322         /*
 323          * Scan through the rest of the container to find where it ends. We do
 324          * some basic sanity-checking too.
 325          */
 326         while (size > 0) {
 327                 struct microcode_amd *mc;
 328                 u32 patch_size;
 329                 int ret;
 330 
 331                 ret = verify_patch(x86_family(desc->cpuid_1_eax), buf, size, &patch_size, true);
 332                 if (ret < 0) {
 333                         /*
 334                          * Patch verification failed, skip to the next
 335                          * container, if there's one:
 336                          */
 337                         goto out;
 338                 } else if (ret > 0) {
 339                         goto skip;
 340                 }
 341 
 342                 mc = (struct microcode_amd *)(buf + SECTION_HDR_SIZE);
 343                 if (eq_id == mc->hdr.processor_rev_id) {
 344                         desc->psize = patch_size;
 345                         desc->mc = mc;
 346                 }
 347 
 348 skip:
 349                 /* Skip patch section header too: */
 350                 buf  += patch_size + SECTION_HDR_SIZE;
 351                 size -= patch_size + SECTION_HDR_SIZE;
 352         }
 353 
 354         /*
 355          * If we have found a patch (desc->mc), it means we're looking at the
 356          * container which has a patch for this CPU so return 0 to mean, @ucode
 357          * already points to the proper container. Otherwise, we return the size
 358          * we scanned so that we can advance to the next container in the
 359          * buffer.
 360          */
 361         if (desc->mc) {
 362                 desc->data = ucode;
 363                 desc->size = orig_size - size;
 364 
 365                 return 0;
 366         }
 367 
 368 out:
 369         return orig_size - size;
 370 }
 371 
 372 /*
 373  * Scan the ucode blob for the proper container as we can have multiple
 374  * containers glued together.
 375  */
 376 static void scan_containers(u8 *ucode, size_t size, struct cont_desc *desc)
 377 {
 378         while (size) {
 379                 size_t s = parse_container(ucode, size, desc);
 380                 if (!s)
 381                         return;
 382 
 383                 /* catch wraparound */
 384                 if (size >= s) {
 385                         ucode += s;
 386                         size  -= s;
 387                 } else {
 388                         return;
 389                 }
 390         }
 391 }
 392 
 393 static int __apply_microcode_amd(struct microcode_amd *mc)
 394 {
 395         u32 rev, dummy;
 396 
 397         native_wrmsrl(MSR_AMD64_PATCH_LOADER, (u64)(long)&mc->hdr.data_code);
 398 
 399         /* verify patch application was successful */
 400         native_rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
 401         if (rev != mc->hdr.patch_id)
 402                 return -1;
 403 
 404         return 0;
 405 }
 406 
 407 /*
 408  * Early load occurs before we can vmalloc(). So we look for the microcode
 409  * patch container file in initrd, traverse equivalent cpu table, look for a
 410  * matching microcode patch, and update, all in initrd memory in place.
 411  * When vmalloc() is available for use later -- on 64-bit during first AP load,
 412  * and on 32-bit during save_microcode_in_initrd_amd() -- we can call
 413  * load_microcode_amd() to save equivalent cpu table and microcode patches in
 414  * kernel heap memory.
 415  *
 416  * Returns true if container found (sets @desc), false otherwise.
 417  */
 418 static bool
 419 apply_microcode_early_amd(u32 cpuid_1_eax, void *ucode, size_t size, bool save_patch)
 420 {
 421         struct cont_desc desc = { 0 };
 422         u8 (*patch)[PATCH_MAX_SIZE];
 423         struct microcode_amd *mc;
 424         u32 rev, dummy, *new_rev;
 425         bool ret = false;
 426 
 427 #ifdef CONFIG_X86_32
 428         new_rev = (u32 *)__pa_nodebug(&ucode_new_rev);
 429         patch   = (u8 (*)[PATCH_MAX_SIZE])__pa_nodebug(&amd_ucode_patch);
 430 #else
 431         new_rev = &ucode_new_rev;
 432         patch   = &amd_ucode_patch;
 433 #endif
 434 
 435         desc.cpuid_1_eax = cpuid_1_eax;
 436 
 437         scan_containers(ucode, size, &desc);
 438 
 439         mc = desc.mc;
 440         if (!mc)
 441                 return ret;
 442 
 443         native_rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
 444         if (rev >= mc->hdr.patch_id)
 445                 return ret;
 446 
 447         if (!__apply_microcode_amd(mc)) {
 448                 *new_rev = mc->hdr.patch_id;
 449                 ret      = true;
 450 
 451                 if (save_patch)
 452                         memcpy(patch, mc, min_t(u32, desc.psize, PATCH_MAX_SIZE));
 453         }
 454 
 455         return ret;
 456 }
 457 
 458 static bool get_builtin_microcode(struct cpio_data *cp, unsigned int family)
 459 {
 460 #ifdef CONFIG_X86_64
 461         char fw_name[36] = "amd-ucode/microcode_amd.bin";
 462 
 463         if (family >= 0x15)
 464                 snprintf(fw_name, sizeof(fw_name),
 465                          "amd-ucode/microcode_amd_fam%.2xh.bin", family);
 466 
 467         return get_builtin_firmware(cp, fw_name);
 468 #else
 469         return false;
 470 #endif
 471 }
 472 
 473 static void __load_ucode_amd(unsigned int cpuid_1_eax, struct cpio_data *ret)
 474 {
 475         struct ucode_cpu_info *uci;
 476         struct cpio_data cp;
 477         const char *path;
 478         bool use_pa;
 479 
 480         if (IS_ENABLED(CONFIG_X86_32)) {
 481                 uci     = (struct ucode_cpu_info *)__pa_nodebug(ucode_cpu_info);
 482                 path    = (const char *)__pa_nodebug(ucode_path);
 483                 use_pa  = true;
 484         } else {
 485                 uci     = ucode_cpu_info;
 486                 path    = ucode_path;
 487                 use_pa  = false;
 488         }
 489 
 490         if (!get_builtin_microcode(&cp, x86_family(cpuid_1_eax)))
 491                 cp = find_microcode_in_initrd(path, use_pa);
 492 
 493         /* Needed in load_microcode_amd() */
 494         uci->cpu_sig.sig = cpuid_1_eax;
 495 
 496         *ret = cp;
 497 }
 498 
 499 void __init load_ucode_amd_bsp(unsigned int cpuid_1_eax)
 500 {
 501         struct cpio_data cp = { };
 502 
 503         __load_ucode_amd(cpuid_1_eax, &cp);
 504         if (!(cp.data && cp.size))
 505                 return;
 506 
 507         apply_microcode_early_amd(cpuid_1_eax, cp.data, cp.size, true);
 508 }
 509 
 510 void load_ucode_amd_ap(unsigned int cpuid_1_eax)
 511 {
 512         struct microcode_amd *mc;
 513         struct cpio_data cp;
 514         u32 *new_rev, rev, dummy;
 515 
 516         if (IS_ENABLED(CONFIG_X86_32)) {
 517                 mc      = (struct microcode_amd *)__pa_nodebug(amd_ucode_patch);
 518                 new_rev = (u32 *)__pa_nodebug(&ucode_new_rev);
 519         } else {
 520                 mc      = (struct microcode_amd *)amd_ucode_patch;
 521                 new_rev = &ucode_new_rev;
 522         }
 523 
 524         native_rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
 525 
 526         /* Check whether we have saved a new patch already: */
 527         if (*new_rev && rev < mc->hdr.patch_id) {
 528                 if (!__apply_microcode_amd(mc)) {
 529                         *new_rev = mc->hdr.patch_id;
 530                         return;
 531                 }
 532         }
 533 
 534         __load_ucode_amd(cpuid_1_eax, &cp);
 535         if (!(cp.data && cp.size))
 536                 return;
 537 
 538         apply_microcode_early_amd(cpuid_1_eax, cp.data, cp.size, false);
 539 }
 540 
 541 static enum ucode_state
 542 load_microcode_amd(bool save, u8 family, const u8 *data, size_t size);
 543 
 544 int __init save_microcode_in_initrd_amd(unsigned int cpuid_1_eax)
 545 {
 546         struct cont_desc desc = { 0 };
 547         enum ucode_state ret;
 548         struct cpio_data cp;
 549 
 550         cp = find_microcode_in_initrd(ucode_path, false);
 551         if (!(cp.data && cp.size))
 552                 return -EINVAL;
 553 
 554         desc.cpuid_1_eax = cpuid_1_eax;
 555 
 556         scan_containers(cp.data, cp.size, &desc);
 557         if (!desc.mc)
 558                 return -EINVAL;
 559 
 560         ret = load_microcode_amd(true, x86_family(cpuid_1_eax), desc.data, desc.size);
 561         if (ret > UCODE_UPDATED)
 562                 return -EINVAL;
 563 
 564         return 0;
 565 }
 566 
 567 void reload_ucode_amd(void)
 568 {
 569         struct microcode_amd *mc;
 570         u32 rev, dummy;
 571 
 572         mc = (struct microcode_amd *)amd_ucode_patch;
 573 
 574         rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
 575 
 576         if (rev < mc->hdr.patch_id) {
 577                 if (!__apply_microcode_amd(mc)) {
 578                         ucode_new_rev = mc->hdr.patch_id;
 579                         pr_info("reload patch_level=0x%08x\n", ucode_new_rev);
 580                 }
 581         }
 582 }
 583 static u16 __find_equiv_id(unsigned int cpu)
 584 {
 585         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 586         return find_equiv_id(&equiv_table, uci->cpu_sig.sig);
 587 }
 588 
 589 /*
 590  * a small, trivial cache of per-family ucode patches
 591  */
 592 static struct ucode_patch *cache_find_patch(u16 equiv_cpu)
 593 {
 594         struct ucode_patch *p;
 595 
 596         list_for_each_entry(p, &microcode_cache, plist)
 597                 if (p->equiv_cpu == equiv_cpu)
 598                         return p;
 599         return NULL;
 600 }
 601 
 602 static void update_cache(struct ucode_patch *new_patch)
 603 {
 604         struct ucode_patch *p;
 605 
 606         list_for_each_entry(p, &microcode_cache, plist) {
 607                 if (p->equiv_cpu == new_patch->equiv_cpu) {
 608                         if (p->patch_id >= new_patch->patch_id) {
 609                                 /* we already have the latest patch */
 610                                 kfree(new_patch->data);
 611                                 kfree(new_patch);
 612                                 return;
 613                         }
 614 
 615                         list_replace(&p->plist, &new_patch->plist);
 616                         kfree(p->data);
 617                         kfree(p);
 618                         return;
 619                 }
 620         }
 621         /* no patch found, add it */
 622         list_add_tail(&new_patch->plist, &microcode_cache);
 623 }
 624 
 625 static void free_cache(void)
 626 {
 627         struct ucode_patch *p, *tmp;
 628 
 629         list_for_each_entry_safe(p, tmp, &microcode_cache, plist) {
 630                 __list_del(p->plist.prev, p->plist.next);
 631                 kfree(p->data);
 632                 kfree(p);
 633         }
 634 }
 635 
 636 static struct ucode_patch *find_patch(unsigned int cpu)
 637 {
 638         u16 equiv_id;
 639 
 640         equiv_id = __find_equiv_id(cpu);
 641         if (!equiv_id)
 642                 return NULL;
 643 
 644         return cache_find_patch(equiv_id);
 645 }
 646 
 647 static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
 648 {
 649         struct cpuinfo_x86 *c = &cpu_data(cpu);
 650         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 651         struct ucode_patch *p;
 652 
 653         csig->sig = cpuid_eax(0x00000001);
 654         csig->rev = c->microcode;
 655 
 656         /*
 657          * a patch could have been loaded early, set uci->mc so that
 658          * mc_bp_resume() can call apply_microcode()
 659          */
 660         p = find_patch(cpu);
 661         if (p && (p->patch_id == csig->rev))
 662                 uci->mc = p->data;
 663 
 664         pr_info("CPU%d: patch_level=0x%08x\n", cpu, csig->rev);
 665 
 666         return 0;
 667 }
 668 
 669 static enum ucode_state apply_microcode_amd(int cpu)
 670 {
 671         struct cpuinfo_x86 *c = &cpu_data(cpu);
 672         struct microcode_amd *mc_amd;
 673         struct ucode_cpu_info *uci;
 674         struct ucode_patch *p;
 675         enum ucode_state ret;
 676         u32 rev, dummy;
 677 
 678         BUG_ON(raw_smp_processor_id() != cpu);
 679 
 680         uci = ucode_cpu_info + cpu;
 681 
 682         p = find_patch(cpu);
 683         if (!p)
 684                 return UCODE_NFOUND;
 685 
 686         mc_amd  = p->data;
 687         uci->mc = p->data;
 688 
 689         rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
 690 
 691         /* need to apply patch? */
 692         if (rev >= mc_amd->hdr.patch_id) {
 693                 ret = UCODE_OK;
 694                 goto out;
 695         }
 696 
 697         if (__apply_microcode_amd(mc_amd)) {
 698                 pr_err("CPU%d: update failed for patch_level=0x%08x\n",
 699                         cpu, mc_amd->hdr.patch_id);
 700                 return UCODE_ERROR;
 701         }
 702 
 703         rev = mc_amd->hdr.patch_id;
 704         ret = UCODE_UPDATED;
 705 
 706         pr_info("CPU%d: new patch_level=0x%08x\n", cpu, rev);
 707 
 708 out:
 709         uci->cpu_sig.rev = rev;
 710         c->microcode     = rev;
 711 
 712         /* Update boot_cpu_data's revision too, if we're on the BSP: */
 713         if (c->cpu_index == boot_cpu_data.cpu_index)
 714                 boot_cpu_data.microcode = rev;
 715 
 716         return ret;
 717 }
 718 
 719 static size_t install_equiv_cpu_table(const u8 *buf, size_t buf_size)
 720 {
 721         u32 equiv_tbl_len;
 722         const u32 *hdr;
 723 
 724         if (!verify_equivalence_table(buf, buf_size, false))
 725                 return 0;
 726 
 727         hdr = (const u32 *)buf;
 728         equiv_tbl_len = hdr[2];
 729 
 730         equiv_table.entry = vmalloc(equiv_tbl_len);
 731         if (!equiv_table.entry) {
 732                 pr_err("failed to allocate equivalent CPU table\n");
 733                 return 0;
 734         }
 735 
 736         memcpy(equiv_table.entry, buf + CONTAINER_HDR_SZ, equiv_tbl_len);
 737         equiv_table.num_entries = equiv_tbl_len / sizeof(struct equiv_cpu_entry);
 738 
 739         /* add header length */
 740         return equiv_tbl_len + CONTAINER_HDR_SZ;
 741 }
 742 
 743 static void free_equiv_cpu_table(void)
 744 {
 745         vfree(equiv_table.entry);
 746         memset(&equiv_table, 0, sizeof(equiv_table));
 747 }
 748 
 749 static void cleanup(void)
 750 {
 751         free_equiv_cpu_table();
 752         free_cache();
 753 }
 754 
 755 /*
 756  * Return a non-negative value even if some of the checks failed so that
 757  * we can skip over the next patch. If we return a negative value, we
 758  * signal a grave error like a memory allocation has failed and the
 759  * driver cannot continue functioning normally. In such cases, we tear
 760  * down everything we've used up so far and exit.
 761  */
 762 static int verify_and_add_patch(u8 family, u8 *fw, unsigned int leftover,
 763                                 unsigned int *patch_size)
 764 {
 765         struct microcode_header_amd *mc_hdr;
 766         struct ucode_patch *patch;
 767         u16 proc_id;
 768         int ret;
 769 
 770         ret = verify_patch(family, fw, leftover, patch_size, false);
 771         if (ret)
 772                 return ret;
 773 
 774         patch = kzalloc(sizeof(*patch), GFP_KERNEL);
 775         if (!patch) {
 776                 pr_err("Patch allocation failure.\n");
 777                 return -EINVAL;
 778         }
 779 
 780         patch->data = kmemdup(fw + SECTION_HDR_SIZE, *patch_size, GFP_KERNEL);
 781         if (!patch->data) {
 782                 pr_err("Patch data allocation failure.\n");
 783                 kfree(patch);
 784                 return -EINVAL;
 785         }
 786 
 787         mc_hdr      = (struct microcode_header_amd *)(fw + SECTION_HDR_SIZE);
 788         proc_id     = mc_hdr->processor_rev_id;
 789 
 790         INIT_LIST_HEAD(&patch->plist);
 791         patch->patch_id  = mc_hdr->patch_id;
 792         patch->equiv_cpu = proc_id;
 793 
 794         pr_debug("%s: Added patch_id: 0x%08x, proc_id: 0x%04x\n",
 795                  __func__, patch->patch_id, proc_id);
 796 
 797         /* ... and add to cache. */
 798         update_cache(patch);
 799 
 800         return 0;
 801 }
 802 
 803 static enum ucode_state __load_microcode_amd(u8 family, const u8 *data,
 804                                              size_t size)
 805 {
 806         u8 *fw = (u8 *)data;
 807         size_t offset;
 808 
 809         offset = install_equiv_cpu_table(data, size);
 810         if (!offset)
 811                 return UCODE_ERROR;
 812 
 813         fw   += offset;
 814         size -= offset;
 815 
 816         if (*(u32 *)fw != UCODE_UCODE_TYPE) {
 817                 pr_err("invalid type field in container file section header\n");
 818                 free_equiv_cpu_table();
 819                 return UCODE_ERROR;
 820         }
 821 
 822         while (size > 0) {
 823                 unsigned int crnt_size = 0;
 824                 int ret;
 825 
 826                 ret = verify_and_add_patch(family, fw, size, &crnt_size);
 827                 if (ret < 0)
 828                         return UCODE_ERROR;
 829 
 830                 fw   +=  crnt_size + SECTION_HDR_SIZE;
 831                 size -= (crnt_size + SECTION_HDR_SIZE);
 832         }
 833 
 834         return UCODE_OK;
 835 }
 836 
 837 static enum ucode_state
 838 load_microcode_amd(bool save, u8 family, const u8 *data, size_t size)
 839 {
 840         struct ucode_patch *p;
 841         enum ucode_state ret;
 842 
 843         /* free old equiv table */
 844         free_equiv_cpu_table();
 845 
 846         ret = __load_microcode_amd(family, data, size);
 847         if (ret != UCODE_OK) {
 848                 cleanup();
 849                 return ret;
 850         }
 851 
 852         p = find_patch(0);
 853         if (!p) {
 854                 return ret;
 855         } else {
 856                 if (boot_cpu_data.microcode >= p->patch_id)
 857                         return ret;
 858 
 859                 ret = UCODE_NEW;
 860         }
 861 
 862         /* save BSP's matching patch for early load */
 863         if (!save)
 864                 return ret;
 865 
 866         memset(amd_ucode_patch, 0, PATCH_MAX_SIZE);
 867         memcpy(amd_ucode_patch, p->data, min_t(u32, ksize(p->data), PATCH_MAX_SIZE));
 868 
 869         return ret;
 870 }
 871 
 872 /*
 873  * AMD microcode firmware naming convention, up to family 15h they are in
 874  * the legacy file:
 875  *
 876  *    amd-ucode/microcode_amd.bin
 877  *
 878  * This legacy file is always smaller than 2K in size.
 879  *
 880  * Beginning with family 15h, they are in family-specific firmware files:
 881  *
 882  *    amd-ucode/microcode_amd_fam15h.bin
 883  *    amd-ucode/microcode_amd_fam16h.bin
 884  *    ...
 885  *
 886  * These might be larger than 2K.
 887  */
 888 static enum ucode_state request_microcode_amd(int cpu, struct device *device,
 889                                               bool refresh_fw)
 890 {
 891         char fw_name[36] = "amd-ucode/microcode_amd.bin";
 892         struct cpuinfo_x86 *c = &cpu_data(cpu);
 893         bool bsp = c->cpu_index == boot_cpu_data.cpu_index;
 894         enum ucode_state ret = UCODE_NFOUND;
 895         const struct firmware *fw;
 896 
 897         /* reload ucode container only on the boot cpu */
 898         if (!refresh_fw || !bsp)
 899                 return UCODE_OK;
 900 
 901         if (c->x86 >= 0x15)
 902                 snprintf(fw_name, sizeof(fw_name), "amd-ucode/microcode_amd_fam%.2xh.bin", c->x86);
 903 
 904         if (request_firmware_direct(&fw, (const char *)fw_name, device)) {
 905                 pr_debug("failed to load file %s\n", fw_name);
 906                 goto out;
 907         }
 908 
 909         ret = UCODE_ERROR;
 910         if (!verify_container(fw->data, fw->size, false))
 911                 goto fw_release;
 912 
 913         ret = load_microcode_amd(bsp, c->x86, fw->data, fw->size);
 914 
 915  fw_release:
 916         release_firmware(fw);
 917 
 918  out:
 919         return ret;
 920 }
 921 
 922 static enum ucode_state
 923 request_microcode_user(int cpu, const void __user *buf, size_t size)
 924 {
 925         return UCODE_ERROR;
 926 }
 927 
 928 static void microcode_fini_cpu_amd(int cpu)
 929 {
 930         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 931 
 932         uci->mc = NULL;
 933 }
 934 
 935 static struct microcode_ops microcode_amd_ops = {
 936         .request_microcode_user           = request_microcode_user,
 937         .request_microcode_fw             = request_microcode_amd,
 938         .collect_cpu_info                 = collect_cpu_info_amd,
 939         .apply_microcode                  = apply_microcode_amd,
 940         .microcode_fini_cpu               = microcode_fini_cpu_amd,
 941 };
 942 
 943 struct microcode_ops * __init init_amd_microcode(void)
 944 {
 945         struct cpuinfo_x86 *c = &boot_cpu_data;
 946 
 947         if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
 948                 pr_warn("AMD CPU family 0x%x not supported\n", c->x86);
 949                 return NULL;
 950         }
 951 
 952         if (ucode_new_rev)
 953                 pr_info_once("microcode updated early to new patch_level=0x%08x\n",
 954                              ucode_new_rev);
 955 
 956         return &microcode_amd_ops;
 957 }
 958 
 959 void __exit exit_amd_microcode(void)
 960 {
 961         cleanup();
 962 }
/* [<][>][^][v][top][bottom][index][help] */
root/arch/x86/kernel/cpu/microcode/amd.c

DEFINITIONS
