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

   1 /*
   2  * Intel CPU Microcode Update Driver for Linux
   3  *
   4  * Copyright (C) 2000-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
   5  *               2006 Shaohua Li <shaohua.li@intel.com>
   6  *
   7  * Intel CPU microcode early update for Linux
   8  *
   9  * Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
  10  *                    H Peter Anvin" <hpa@zytor.com>
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version
  15  * 2 of the License, or (at your option) any later version.
  16  */
  17
  18 /*
  19  * This needs to be before all headers so that pr_debug in printk.h doesn't turn
  20  * printk calls into no_printk().
  21  *
  22  *#define DEBUG
  23  */
  24 #define pr_fmt(fmt) "microcode: " fmt
  25
  26 #include <linux/earlycpio.h>
  27 #include <linux/firmware.h>
  28 #include <linux/uaccess.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/initrd.h>
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/cpu.h>
  34 #include <linux/mm.h>
  35
  36 #include <asm/microcode_intel.h>
  37 #include <asm/processor.h>
  38 #include <asm/tlbflush.h>
  39 #include <asm/setup.h>
  40 #include <asm/msr.h>
  41
  42 static unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT];
  43 static struct mc_saved_data {
  44         unsigned int num_saved;
  45         struct microcode_intel **mc_saved;
  46 } mc_saved_data;
  47
  48 static enum ucode_state
  49 load_microcode_early(struct microcode_intel **saved,
  50                      unsigned int num_saved, struct ucode_cpu_info *uci)
  51 {
  52         struct microcode_intel *ucode_ptr, *new_mc = NULL;
  53         struct microcode_header_intel *mc_hdr;
  54         int new_rev, ret, i;
  55
  56         new_rev = uci->cpu_sig.rev;
  57
  58         for (i = 0; i < num_saved; i++) {
  59                 ucode_ptr = saved[i];
  60                 mc_hdr    = (struct microcode_header_intel *)ucode_ptr;
  61
  62                 ret = has_newer_microcode(ucode_ptr,
  63                                           uci->cpu_sig.sig,
  64                                           uci->cpu_sig.pf,
  65                                           new_rev);
  66                 if (!ret)
  67                         continue;
  68
  69                 new_rev = mc_hdr->rev;
  70                 new_mc  = ucode_ptr;
  71         }
  72
  73         if (!new_mc)
  74                 return UCODE_NFOUND;
  75
  76         uci->mc = (struct microcode_intel *)new_mc;
  77         return UCODE_OK;
  78 }
  79
  80 static inline void
  81 copy_initrd_ptrs(struct microcode_intel **mc_saved, unsigned long *initrd,
  82                   unsigned long off, int num_saved)
  83 {
  84         int i;
  85
  86         for (i = 0; i < num_saved; i++)
  87                 mc_saved[i] = (struct microcode_intel *)(initrd[i] + off);
  88 }
  89
  90 #ifdef CONFIG_X86_32
  91 static void
  92 microcode_phys(struct microcode_intel **mc_saved_tmp, struct mc_saved_data *mcs)
  93 {
  94         int i;
  95         struct microcode_intel ***mc_saved;
  96
  97         mc_saved = (struct microcode_intel ***)__pa_nodebug(&mcs->mc_saved);
  98
  99         for (i = 0; i < mcs->num_saved; i++) {
 100                 struct microcode_intel *p;
 101
 102                 p = *(struct microcode_intel **)__pa_nodebug(mcs->mc_saved + i);
 103                 mc_saved_tmp[i] = (struct microcode_intel *)__pa_nodebug(p);
 104         }
 105 }
 106 #endif
 107
 108 static enum ucode_state
 109 load_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
 110                unsigned long initrd_start, struct ucode_cpu_info *uci)
 111 {
 112         struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
 113         unsigned int count = mcs->num_saved;
 114
 115         if (!mcs->mc_saved) {
 116                 copy_initrd_ptrs(mc_saved_tmp, initrd, initrd_start, count);
 117
 118                 return load_microcode_early(mc_saved_tmp, count, uci);
 119         } else {
 120 #ifdef CONFIG_X86_32
 121                 microcode_phys(mc_saved_tmp, mcs);
 122                 return load_microcode_early(mc_saved_tmp, count, uci);
 123 #else
 124                 return load_microcode_early(mcs->mc_saved, count, uci);
 125 #endif
 126         }
 127 }
 128
 129 /*
 130  * Given CPU signature and a microcode patch, this function finds if the
 131  * microcode patch has matching family and model with the CPU.
 132  */
 133 static enum ucode_state
 134 matching_model_microcode(struct microcode_header_intel *mc_header,
 135                         unsigned long sig)
 136 {
 137         unsigned int fam, model;
 138         unsigned int fam_ucode, model_ucode;
 139         struct extended_sigtable *ext_header;
 140         unsigned long total_size = get_totalsize(mc_header);
 141         unsigned long data_size = get_datasize(mc_header);
 142         int ext_sigcount, i;
 143         struct extended_signature *ext_sig;
 144
 145         fam   = x86_family(sig);
 146         model = x86_model(sig);
 147
 148         fam_ucode   = x86_family(mc_header->sig);
 149         model_ucode = x86_model(mc_header->sig);
 150
 151         if (fam == fam_ucode && model == model_ucode)
 152                 return UCODE_OK;
 153
 154         /* Look for ext. headers: */
 155         if (total_size <= data_size + MC_HEADER_SIZE)
 156                 return UCODE_NFOUND;
 157
 158         ext_header   = (void *) mc_header + data_size + MC_HEADER_SIZE;
 159         ext_sig      = (void *)ext_header + EXT_HEADER_SIZE;
 160         ext_sigcount = ext_header->count;
 161
 162         for (i = 0; i < ext_sigcount; i++) {
 163                 fam_ucode   = x86_family(ext_sig->sig);
 164                 model_ucode = x86_model(ext_sig->sig);
 165
 166                 if (fam == fam_ucode && model == model_ucode)
 167                         return UCODE_OK;
 168
 169                 ext_sig++;
 170         }
 171         return UCODE_NFOUND;
 172 }
 173
 174 static int
 175 save_microcode(struct mc_saved_data *mcs,
 176                struct microcode_intel **mc_saved_src,
 177                unsigned int num_saved)
 178 {
 179         int i, j;
 180         struct microcode_intel **saved_ptr;
 181         int ret;
 182
 183         if (!num_saved)
 184                 return -EINVAL;
 185
 186         /*
 187          * Copy new microcode data.
 188          */
 189         saved_ptr = kcalloc(num_saved, sizeof(struct microcode_intel *), GFP_KERNEL);
 190         if (!saved_ptr)
 191                 return -ENOMEM;
 192
 193         for (i = 0; i < num_saved; i++) {
 194                 struct microcode_header_intel *mc_hdr;
 195                 struct microcode_intel *mc;
 196                 unsigned long size;
 197
 198                 if (!mc_saved_src[i]) {
 199                         ret = -EINVAL;
 200                         goto err;
 201                 }
 202
 203                 mc     = mc_saved_src[i];
 204                 mc_hdr = &mc->hdr;
 205                 size   = get_totalsize(mc_hdr);
 206
 207                 saved_ptr[i] = kmalloc(size, GFP_KERNEL);
 208                 if (!saved_ptr[i]) {
 209                         ret = -ENOMEM;
 210                         goto err;
 211                 }
 212
 213                 memcpy(saved_ptr[i], mc, size);
 214         }
 215
 216         /*
 217          * Point to newly saved microcode.
 218          */
 219         mcs->mc_saved  = saved_ptr;
 220         mcs->num_saved = num_saved;
 221
 222         return 0;
 223
 224 err:
 225         for (j = 0; j <= i; j++)
 226                 kfree(saved_ptr[j]);
 227         kfree(saved_ptr);
 228
 229         return ret;
 230 }
 231
 232 /*
 233  * A microcode patch in ucode_ptr is saved into mc_saved
 234  * - if it has matching signature and newer revision compared to an existing
 235  *   patch mc_saved.
 236  * - or if it is a newly discovered microcode patch.
 237  *
 238  * The microcode patch should have matching model with CPU.
 239  *
 240  * Returns: The updated number @num_saved of saved microcode patches.
 241  */
 242 static unsigned int _save_mc(struct microcode_intel **mc_saved,
 243                              u8 *ucode_ptr, unsigned int num_saved)
 244 {
 245         struct microcode_header_intel *mc_hdr, *mc_saved_hdr;
 246         unsigned int sig, pf;
 247         int found = 0, i;
 248
 249         mc_hdr = (struct microcode_header_intel *)ucode_ptr;
 250
 251         for (i = 0; i < num_saved; i++) {
 252                 mc_saved_hdr = (struct microcode_header_intel *)mc_saved[i];
 253                 sig          = mc_saved_hdr->sig;
 254                 pf           = mc_saved_hdr->pf;
 255
 256                 if (!find_matching_signature(ucode_ptr, sig, pf))
 257                         continue;
 258
 259                 found = 1;
 260
 261                 if (mc_hdr->rev <= mc_saved_hdr->rev)
 262                         continue;
 263
 264                 /*
 265                  * Found an older ucode saved earlier. Replace it with
 266                  * this newer one.
 267                  */
 268                 mc_saved[i] = (struct microcode_intel *)ucode_ptr;
 269                 break;
 270         }
 271
 272         /* Newly detected microcode, save it to memory. */
 273         if (i >= num_saved && !found)
 274                 mc_saved[num_saved++] = (struct microcode_intel *)ucode_ptr;
 275
 276         return num_saved;
 277 }
 278
 279 /*
 280  * Get microcode matching with BSP's model. Only CPUs with the same model as
 281  * BSP can stay in the platform.
 282  */
 283 static enum ucode_state __init
 284 get_matching_model_microcode(int cpu, unsigned long start,
 285                              void *data, size_t size,
 286                              struct mc_saved_data *mcs,
 287                              unsigned long *mc_saved_in_initrd,
 288                              struct ucode_cpu_info *uci)
 289 {
 290         u8 *ucode_ptr = data;
 291         unsigned int leftover = size;
 292         enum ucode_state state = UCODE_OK;
 293         unsigned int mc_size;
 294         struct microcode_header_intel *mc_header;
 295         struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
 296         unsigned int num_saved = mcs->num_saved;
 297         int i;
 298
 299         while (leftover && num_saved < ARRAY_SIZE(mc_saved_tmp)) {
 300
 301                 if (leftover < sizeof(mc_header))
 302                         break;
 303
 304                 mc_header = (struct microcode_header_intel *)ucode_ptr;
 305
 306                 mc_size = get_totalsize(mc_header);
 307                 if (!mc_size || mc_size > leftover ||
 308                         microcode_sanity_check(ucode_ptr, 0) < 0)
 309                         break;
 310
 311                 leftover -= mc_size;
 312
 313                 /*
 314                  * Since APs with same family and model as the BSP may boot in
 315                  * the platform, we need to find and save microcode patches
 316                  * with the same family and model as the BSP.
 317                  */
 318                 if (matching_model_microcode(mc_header, uci->cpu_sig.sig) !=
 319                          UCODE_OK) {
 320                         ucode_ptr += mc_size;
 321                         continue;
 322                 }
 323
 324                 num_saved = _save_mc(mc_saved_tmp, ucode_ptr, num_saved);
 325
 326                 ucode_ptr += mc_size;
 327         }
 328
 329         if (leftover) {
 330                 state = UCODE_ERROR;
 331                 goto out;
 332         }
 333
 334         if (!num_saved) {
 335                 state = UCODE_NFOUND;
 336                 goto out;
 337         }
 338
 339         for (i = 0; i < num_saved; i++)
 340                 mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
 341
 342         mcs->num_saved = num_saved;
 343 out:
 344         return state;
 345 }
 346
 347 static int collect_cpu_info_early(struct ucode_cpu_info *uci)
 348 {
 349         unsigned int val[2];
 350         unsigned int family, model;
 351         struct cpu_signature csig;
 352         unsigned int eax, ebx, ecx, edx;
 353
 354         csig.sig = 0;
 355         csig.pf = 0;
 356         csig.rev = 0;
 357
 358         memset(uci, 0, sizeof(*uci));
 359
 360         eax = 0x00000001;
 361         ecx = 0;
 362         native_cpuid(&eax, &ebx, &ecx, &edx);
 363         csig.sig = eax;
 364
 365         family = x86_family(csig.sig);
 366         model  = x86_model(csig.sig);
 367
 368         if ((model >= 5) || (family > 6)) {
 369                 /* get processor flags from MSR 0x17 */
 370                 native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
 371                 csig.pf = 1 << ((val[1] >> 18) & 7);
 372         }
 373         native_wrmsrl(MSR_IA32_UCODE_REV, 0);
 374
 375         /* As documented in the SDM: Do a CPUID 1 here */
 376         sync_core();
 377
 378         /* get the current revision from MSR 0x8B */
 379         native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
 380
 381         csig.rev = val[1];
 382
 383         uci->cpu_sig = csig;
 384         uci->valid = 1;
 385
 386         return 0;
 387 }
 388
 389 static void show_saved_mc(void)
 390 {
 391 #ifdef DEBUG
 392         int i, j;
 393         unsigned int sig, pf, rev, total_size, data_size, date;
 394         struct ucode_cpu_info uci;
 395
 396         if (!mc_saved_data.num_saved) {
 397                 pr_debug("no microcode data saved.\n");
 398                 return;
 399         }
 400         pr_debug("Total microcode saved: %d\n", mc_saved_data.num_saved);
 401
 402         collect_cpu_info_early(&uci);
 403
 404         sig = uci.cpu_sig.sig;
 405         pf = uci.cpu_sig.pf;
 406         rev = uci.cpu_sig.rev;
 407         pr_debug("CPU: sig=0x%x, pf=0x%x, rev=0x%x\n", sig, pf, rev);
 408
 409         for (i = 0; i < mc_saved_data.num_saved; i++) {
 410                 struct microcode_header_intel *mc_saved_header;
 411                 struct extended_sigtable *ext_header;
 412                 int ext_sigcount;
 413                 struct extended_signature *ext_sig;
 414
 415                 mc_saved_header = (struct microcode_header_intel *)
 416                                   mc_saved_data.mc_saved[i];
 417                 sig = mc_saved_header->sig;
 418                 pf = mc_saved_header->pf;
 419                 rev = mc_saved_header->rev;
 420                 total_size = get_totalsize(mc_saved_header);
 421                 data_size = get_datasize(mc_saved_header);
 422                 date = mc_saved_header->date;
 423
 424                 pr_debug("mc_saved[%d]: sig=0x%x, pf=0x%x, rev=0x%x, toal size=0x%x, date = %04x-%02x-%02x\n",
 425                          i, sig, pf, rev, total_size,
 426                          date & 0xffff,
 427                          date >> 24,
 428                          (date >> 16) & 0xff);
 429
 430                 /* Look for ext. headers: */
 431                 if (total_size <= data_size + MC_HEADER_SIZE)
 432                         continue;
 433
 434                 ext_header = (void *) mc_saved_header + data_size + MC_HEADER_SIZE;
 435                 ext_sigcount = ext_header->count;
 436                 ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
 437
 438                 for (j = 0; j < ext_sigcount; j++) {
 439                         sig = ext_sig->sig;
 440                         pf = ext_sig->pf;
 441
 442                         pr_debug("\tExtended[%d]: sig=0x%x, pf=0x%x\n",
 443                                  j, sig, pf);
 444
 445                         ext_sig++;
 446                 }
 447
 448         }
 449 #endif
 450 }
 451
 452 #ifdef CONFIG_HOTPLUG_CPU
 453 static DEFINE_MUTEX(x86_cpu_microcode_mutex);
 454 /*
 455  * Save this mc into mc_saved_data. So it will be loaded early when a CPU is
 456  * hot added or resumes.
 457  *
 458  * Please make sure this mc should be a valid microcode patch before calling
 459  * this function.
 460  */
 461 int save_mc_for_early(u8 *mc)
 462 {
 463         struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
 464         unsigned int mc_saved_count_init;
 465         unsigned int num_saved;
 466         struct microcode_intel **mc_saved;
 467         int ret = 0;
 468         int i;
 469
 470         /*
 471          * Hold hotplug lock so mc_saved_data is not accessed by a CPU in
 472          * hotplug.
 473          */
 474         mutex_lock(&x86_cpu_microcode_mutex);
 475
 476         mc_saved_count_init = mc_saved_data.num_saved;
 477         num_saved = mc_saved_data.num_saved;
 478         mc_saved = mc_saved_data.mc_saved;
 479
 480         if (mc_saved && num_saved)
 481                 memcpy(mc_saved_tmp, mc_saved,
 482                        num_saved * sizeof(struct microcode_intel *));
 483         /*
 484          * Save the microcode patch mc in mc_save_tmp structure if it's a newer
 485          * version.
 486          */
 487         num_saved = _save_mc(mc_saved_tmp, mc, num_saved);
 488
 489         /*
 490          * Save the mc_save_tmp in global mc_saved_data.
 491          */
 492         ret = save_microcode(&mc_saved_data, mc_saved_tmp, num_saved);
 493         if (ret) {
 494                 pr_err("Cannot save microcode patch.\n");
 495                 goto out;
 496         }
 497
 498         show_saved_mc();
 499
 500         /*
 501          * Free old saved microcode data.
 502          */
 503         if (mc_saved) {
 504                 for (i = 0; i < mc_saved_count_init; i++)
 505                         kfree(mc_saved[i]);
 506                 kfree(mc_saved);
 507         }
 508
 509 out:
 510         mutex_unlock(&x86_cpu_microcode_mutex);
 511
 512         return ret;
 513 }
 514 EXPORT_SYMBOL_GPL(save_mc_for_early);
 515 #endif
 516
 517 static bool __init load_builtin_intel_microcode(struct cpio_data *cp)
 518 {
 519 #ifdef CONFIG_X86_64
 520         unsigned int eax = 0x00000001, ebx, ecx = 0, edx;
 521         char name[30];
 522
 523         native_cpuid(&eax, &ebx, &ecx, &edx);
 524
 525         sprintf(name, "intel-ucode/%02x-%02x-%02x",
 526                       x86_family(eax), x86_model(eax), x86_stepping(eax));
 527
 528         return get_builtin_firmware(cp, name);
 529 #else
 530         return false;
 531 #endif
 532 }
 533
 534 static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
 535 static __init enum ucode_state
 536 scan_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
 537                unsigned long start, unsigned long size,
 538                struct ucode_cpu_info *uci)
 539 {
 540         struct cpio_data cd;
 541         long offset = 0;
 542 #ifdef CONFIG_X86_32
 543         char *p = (char *)__pa_nodebug(ucode_name);
 544 #else
 545         char *p = ucode_name;
 546 #endif
 547
 548         cd.data = NULL;
 549         cd.size = 0;
 550
 551         /* try built-in microcode if no initrd */
 552         if (!size) {
 553                 if (!load_builtin_intel_microcode(&cd))
 554                         return UCODE_ERROR;
 555         } else {
 556                 cd = find_cpio_data(p, (void *)start, size, &offset);
 557                 if (!cd.data)
 558                         return UCODE_ERROR;
 559         }
 560
 561         return get_matching_model_microcode(0, start, cd.data, cd.size,
 562                                             mcs, initrd, uci);
 563 }
 564
 565 /*
 566  * Print ucode update info.
 567  */
 568 static void
 569 print_ucode_info(struct ucode_cpu_info *uci, unsigned int date)
 570 {
 571         pr_info_once("microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n",
 572                      uci->cpu_sig.rev,
 573                      date & 0xffff,
 574                      date >> 24,
 575                      (date >> 16) & 0xff);
 576 }
 577
 578 #ifdef CONFIG_X86_32
 579
 580 static int delay_ucode_info;
 581 static int current_mc_date;
 582
 583 /*
 584  * Print early updated ucode info after printk works. This is delayed info dump.
 585  */
 586 void show_ucode_info_early(void)
 587 {
 588         struct ucode_cpu_info uci;
 589
 590         if (delay_ucode_info) {
 591                 collect_cpu_info_early(&uci);
 592                 print_ucode_info(&uci, current_mc_date);
 593                 delay_ucode_info = 0;
 594         }
 595 }
 596
 597 /*
 598  * At this point, we can not call printk() yet. Keep microcode patch number in
 599  * mc_saved_data.mc_saved and delay printing microcode info in
 600  * show_ucode_info_early() until printk() works.
 601  */
 602 static void print_ucode(struct ucode_cpu_info *uci)
 603 {
 604         struct microcode_intel *mc;
 605         int *delay_ucode_info_p;
 606         int *current_mc_date_p;
 607
 608         mc = uci->mc;
 609         if (!mc)
 610                 return;
 611
 612         delay_ucode_info_p = (int *)__pa_nodebug(&delay_ucode_info);
 613         current_mc_date_p = (int *)__pa_nodebug(&current_mc_date);
 614
 615         *delay_ucode_info_p = 1;
 616         *current_mc_date_p = mc->hdr.date;
 617 }
 618 #else
 619
 620 /*
 621  * Flush global tlb. We only do this in x86_64 where paging has been enabled
 622  * already and PGE should be enabled as well.
 623  */
 624 static inline void flush_tlb_early(void)
 625 {
 626         __native_flush_tlb_global_irq_disabled();
 627 }
 628
 629 static inline void print_ucode(struct ucode_cpu_info *uci)
 630 {
 631         struct microcode_intel *mc;
 632
 633         mc = uci->mc;
 634         if (!mc)
 635                 return;
 636
 637         print_ucode_info(uci, mc->hdr.date);
 638 }
 639 #endif
 640
 641 static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 642 {
 643         struct microcode_intel *mc;
 644         unsigned int val[2];
 645
 646         mc = uci->mc;
 647         if (!mc)
 648                 return 0;
 649
 650         /* write microcode via MSR 0x79 */
 651         native_wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
 652         native_wrmsrl(MSR_IA32_UCODE_REV, 0);
 653
 654         /* As documented in the SDM: Do a CPUID 1 here */
 655         sync_core();
 656
 657         /* get the current revision from MSR 0x8B */
 658         native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
 659         if (val[1] != mc->hdr.rev)
 660                 return -1;
 661
 662 #ifdef CONFIG_X86_64
 663         /* Flush global tlb. This is precaution. */
 664         flush_tlb_early();
 665 #endif
 666         uci->cpu_sig.rev = val[1];
 667
 668         if (early)
 669                 print_ucode(uci);
 670         else
 671                 print_ucode_info(uci, mc->hdr.date);
 672
 673         return 0;
 674 }
 675
 676 /*
 677  * This function converts microcode patch offsets previously stored in
 678  * mc_saved_in_initrd to pointers and stores the pointers in mc_saved_data.
 679  */
 680 int __init save_microcode_in_initrd_intel(void)
 681 {
 682         unsigned int count = mc_saved_data.num_saved;
 683         struct microcode_intel *mc_saved[MAX_UCODE_COUNT];
 684         int ret = 0;
 685
 686         if (!count)
 687                 return ret;
 688
 689         copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, get_initrd_start(), count);
 690
 691         ret = save_microcode(&mc_saved_data, mc_saved, count);
 692         if (ret)
 693                 pr_err("Cannot save microcode patches from initrd.\n");
 694
 695         show_saved_mc();
 696
 697         return ret;
 698 }
 699
 700 static void __init
 701 _load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *initrd,
 702                       unsigned long start, unsigned long size)
 703 {
 704         struct ucode_cpu_info uci;
 705         enum ucode_state ret;
 706
 707         collect_cpu_info_early(&uci);
 708
 709         ret = scan_microcode(mcs, initrd, start, size, &uci);
 710         if (ret != UCODE_OK)
 711                 return;
 712
 713         ret = load_microcode(mcs, initrd, start, &uci);
 714         if (ret != UCODE_OK)
 715                 return;
 716
 717         apply_microcode_early(&uci, true);
 718 }
 719
 720 void __init load_ucode_intel_bsp(void)
 721 {
 722         u64 start, size;
 723 #ifdef CONFIG_X86_32
 724         struct boot_params *p;
 725
 726         p       = (struct boot_params *)__pa_nodebug(&boot_params);
 727         size    = p->hdr.ramdisk_size;
 728
 729         /*
 730          * Set start only if we have an initrd image. We cannot use initrd_start
 731          * because it is not set that early yet.
 732          */
 733         start   = (size ? p->hdr.ramdisk_image : 0);
 734
 735         _load_ucode_intel_bsp((struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
 736                               (unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
 737                               start, size);
 738 #else
 739         size    = boot_params.hdr.ramdisk_size;
 740         start   = (size ? boot_params.hdr.ramdisk_image + PAGE_OFFSET : 0);
 741
 742         _load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd, start, size);
 743 #endif
 744 }
 745
 746 void load_ucode_intel_ap(void)
 747 {
 748         unsigned long *mc_saved_in_initrd_p;
 749         struct mc_saved_data *mcs_p;
 750         struct ucode_cpu_info uci;
 751         enum ucode_state ret;
 752 #ifdef CONFIG_X86_32
 753
 754         mc_saved_in_initrd_p = (unsigned long *)__pa_nodebug(mc_saved_in_initrd);
 755         mcs_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
 756 #else
 757         mc_saved_in_initrd_p = mc_saved_in_initrd;
 758         mcs_p = &mc_saved_data;
 759 #endif
 760
 761         /*
 762          * If there is no valid ucode previously saved in memory, no need to
 763          * update ucode on this AP.
 764          */
 765         if (!mcs_p->num_saved)
 766                 return;
 767
 768         collect_cpu_info_early(&uci);
 769         ret = load_microcode(mcs_p, mc_saved_in_initrd_p,
 770                              get_initrd_start_addr(), &uci);
 771
 772         if (ret != UCODE_OK)
 773                 return;
 774
 775         apply_microcode_early(&uci, true);
 776 }
 777
 778 void reload_ucode_intel(void)
 779 {
 780         struct ucode_cpu_info uci;
 781         enum ucode_state ret;
 782
 783         if (!mc_saved_data.num_saved)
 784                 return;
 785
 786         collect_cpu_info_early(&uci);
 787
 788         ret = load_microcode_early(mc_saved_data.mc_saved,
 789                                    mc_saved_data.num_saved, &uci);
 790         if (ret != UCODE_OK)
 791                 return;
 792
 793         apply_microcode_early(&uci, false);
 794 }
 795
 796 static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
 797 {
 798         struct cpuinfo_x86 *c = &cpu_data(cpu_num);
 799         unsigned int val[2];
 800
 801         memset(csig, 0, sizeof(*csig));
 802
 803         csig->sig = cpuid_eax(0x00000001);
 804
 805         if ((c->x86_model >= 5) || (c->x86 > 6)) {
 806                 /* get processor flags from MSR 0x17 */
 807                 rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
 808                 csig->pf = 1 << ((val[1] >> 18) & 7);
 809         }
 810
 811         csig->rev = c->microcode;
 812         pr_info("CPU%d sig=0x%x, pf=0x%x, revision=0x%x\n",
 813                 cpu_num, csig->sig, csig->pf, csig->rev);
 814
 815         return 0;
 816 }
 817
 818 /*
 819  * return 0 - no update found
 820  * return 1 - found update
 821  */
 822 static int get_matching_mc(struct microcode_intel *mc, int cpu)
 823 {
 824         struct cpu_signature cpu_sig;
 825         unsigned int csig, cpf, crev;
 826
 827         collect_cpu_info(cpu, &cpu_sig);
 828
 829         csig = cpu_sig.sig;
 830         cpf = cpu_sig.pf;
 831         crev = cpu_sig.rev;
 832
 833         return has_newer_microcode(mc, csig, cpf, crev);
 834 }
 835
 836 static int apply_microcode_intel(int cpu)
 837 {
 838         struct microcode_intel *mc;
 839         struct ucode_cpu_info *uci;
 840         struct cpuinfo_x86 *c;
 841         unsigned int val[2];
 842
 843         /* We should bind the task to the CPU */
 844         if (WARN_ON(raw_smp_processor_id() != cpu))
 845                 return -1;
 846
 847         uci = ucode_cpu_info + cpu;
 848         mc = uci->mc;
 849         if (!mc)
 850                 return 0;
 851
 852         /*
 853          * Microcode on this CPU could be updated earlier. Only apply the
 854          * microcode patch in mc when it is newer than the one on this
 855          * CPU.
 856          */
 857         if (!get_matching_mc(mc, cpu))
 858                 return 0;
 859
 860         /* write microcode via MSR 0x79 */
 861         wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
 862         wrmsrl(MSR_IA32_UCODE_REV, 0);
 863
 864         /* As documented in the SDM: Do a CPUID 1 here */
 865         sync_core();
 866
 867         /* get the current revision from MSR 0x8B */
 868         rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
 869
 870         if (val[1] != mc->hdr.rev) {
 871                 pr_err("CPU%d update to revision 0x%x failed\n",
 872                        cpu, mc->hdr.rev);
 873                 return -1;
 874         }
 875
 876         pr_info("CPU%d updated to revision 0x%x, date = %04x-%02x-%02x\n",
 877                 cpu, val[1],
 878                 mc->hdr.date & 0xffff,
 879                 mc->hdr.date >> 24,
 880                 (mc->hdr.date >> 16) & 0xff);
 881
 882         c = &cpu_data(cpu);
 883
 884         uci->cpu_sig.rev = val[1];
 885         c->microcode = val[1];
 886
 887         return 0;
 888 }
 889
 890 static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
 891                                 int (*get_ucode_data)(void *, const void *, size_t))
 892 {
 893         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 894         u8 *ucode_ptr = data, *new_mc = NULL, *mc = NULL;
 895         int new_rev = uci->cpu_sig.rev;
 896         unsigned int leftover = size;
 897         enum ucode_state state = UCODE_OK;
 898         unsigned int curr_mc_size = 0;
 899         unsigned int csig, cpf;
 900
 901         while (leftover) {
 902                 struct microcode_header_intel mc_header;
 903                 unsigned int mc_size;
 904
 905                 if (leftover < sizeof(mc_header)) {
 906                         pr_err("error! Truncated header in microcode data file\n");
 907                         break;
 908                 }
 909
 910                 if (get_ucode_data(&mc_header, ucode_ptr, sizeof(mc_header)))
 911                         break;
 912
 913                 mc_size = get_totalsize(&mc_header);
 914                 if (!mc_size || mc_size > leftover) {
 915                         pr_err("error! Bad data in microcode data file\n");
 916                         break;
 917                 }
 918
 919                 /* For performance reasons, reuse mc area when possible */
 920                 if (!mc || mc_size > curr_mc_size) {
 921                         vfree(mc);
 922                         mc = vmalloc(mc_size);
 923                         if (!mc)
 924                                 break;
 925                         curr_mc_size = mc_size;
 926                 }
 927
 928                 if (get_ucode_data(mc, ucode_ptr, mc_size) ||
 929                     microcode_sanity_check(mc, 1) < 0) {
 930                         break;
 931                 }
 932
 933                 csig = uci->cpu_sig.sig;
 934                 cpf = uci->cpu_sig.pf;
 935                 if (has_newer_microcode(mc, csig, cpf, new_rev)) {
 936                         vfree(new_mc);
 937                         new_rev = mc_header.rev;
 938                         new_mc  = mc;
 939                         mc = NULL;      /* trigger new vmalloc */
 940                 }
 941
 942                 ucode_ptr += mc_size;
 943                 leftover  -= mc_size;
 944         }
 945
 946         vfree(mc);
 947
 948         if (leftover) {
 949                 vfree(new_mc);
 950                 state = UCODE_ERROR;
 951                 goto out;
 952         }
 953
 954         if (!new_mc) {
 955                 state = UCODE_NFOUND;
 956                 goto out;
 957         }
 958
 959         vfree(uci->mc);
 960         uci->mc = (struct microcode_intel *)new_mc;
 961
 962         /*
 963          * If early loading microcode is supported, save this mc into
 964          * permanent memory. So it will be loaded early when a CPU is hot added
 965          * or resumes.
 966          */
 967         save_mc_for_early(new_mc);
 968
 969         pr_debug("CPU%d found a matching microcode update with version 0x%x (current=0x%x)\n",
 970                  cpu, new_rev, uci->cpu_sig.rev);
 971 out:
 972         return state;
 973 }
 974
 975 static int get_ucode_fw(void *to, const void *from, size_t n)
 976 {
 977         memcpy(to, from, n);
 978         return 0;
 979 }
 980
 981 static enum ucode_state request_microcode_fw(int cpu, struct device *device,
 982                                              bool refresh_fw)
 983 {
 984         char name[30];
 985         struct cpuinfo_x86 *c = &cpu_data(cpu);
 986         const struct firmware *firmware;
 987         enum ucode_state ret;
 988
 989         sprintf(name, "intel-ucode/%02x-%02x-%02x",
 990                 c->x86, c->x86_model, c->x86_mask);
 991
 992         if (request_firmware_direct(&firmware, name, device)) {
 993                 pr_debug("data file %s load failed\n", name);
 994                 return UCODE_NFOUND;
 995         }
 996
 997         ret = generic_load_microcode(cpu, (void *)firmware->data,
 998                                      firmware->size, &get_ucode_fw);
 999
1000         release_firmware(firmware);
1001
1002         return ret;
1003 }
1004
1005 static int get_ucode_user(void *to, const void *from, size_t n)
1006 {
1007         return copy_from_user(to, from, n);
1008 }
1009
1010 static enum ucode_state
1011 request_microcode_user(int cpu, const void __user *buf, size_t size)
1012 {
1013         return generic_load_microcode(cpu, (void *)buf, size, &get_ucode_user);
1014 }
1015
1016 static void microcode_fini_cpu(int cpu)
1017 {
1018         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
1019
1020         vfree(uci->mc);
1021         uci->mc = NULL;
1022 }
1023
1024 static struct microcode_ops microcode_intel_ops = {
1025         .request_microcode_user           = request_microcode_user,
1026         .request_microcode_fw             = request_microcode_fw,
1027         .collect_cpu_info                 = collect_cpu_info,
1028         .apply_microcode                  = apply_microcode_intel,
1029         .microcode_fini_cpu               = microcode_fini_cpu,
1030 };
1031
1032 struct microcode_ops * __init init_intel_microcode(void)
1033 {
1034         struct cpuinfo_x86 *c = &boot_cpu_data;
1035
1036         if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
1037             cpu_has(c, X86_FEATURE_IA64)) {
1038                 pr_err("Intel CPU family 0x%x not supported\n", c->x86);
1039                 return NULL;
1040         }
1041
1042         return &microcode_intel_ops;
1043 }
1044