arch/x86/kernel/cpu/amd.c

   1 #include <linux/export.h>
   2 #include <linux/init.h>
   3 #include <linux/bitops.h>
   4 #include <linux/elf.h>
   5 #include <linux/mm.h>
   6
   7 #include <linux/io.h>
   8 #include <linux/sched.h>
   9 #include <asm/processor.h>
  10 #include <asm/apic.h>
  11 #include <asm/cpu.h>
  12 #include <asm/pci-direct.h>
  13
  14 #ifdef CONFIG_X86_64
  15 # include <asm/mmconfig.h>
  16 # include <asm/cacheflush.h>
  17 #endif
  18
  19 #include "cpu.h"
  20
  21 static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)
  22 {
  23         u32 gprs[8] = { 0 };
  24         int err;
  25
  26         WARN_ONCE((boot_cpu_data.x86 != 0xf),
  27                   "%s should only be used on K8!\n", __func__);
  28
  29         gprs[1] = msr;
  30         gprs[7] = 0x9c5a203a;
  31
  32         err = rdmsr_safe_regs(gprs);
  33
  34         *p = gprs[0] | ((u64)gprs[2] << 32);
  35
  36         return err;
  37 }
  38
  39 static inline int wrmsrl_amd_safe(unsigned msr, unsigned long long val)
  40 {
  41         u32 gprs[8] = { 0 };
  42
  43         WARN_ONCE((boot_cpu_data.x86 != 0xf),
  44                   "%s should only be used on K8!\n", __func__);
  45
  46         gprs[0] = (u32)val;
  47         gprs[1] = msr;
  48         gprs[2] = val >> 32;
  49         gprs[7] = 0x9c5a203a;
  50
  51         return wrmsr_safe_regs(gprs);
  52 }
  53
  54 #ifdef CONFIG_X86_32
  55 /*
  56  *      B step AMD K6 before B 9730xxxx have hardware bugs that can cause
  57  *      misexecution of code under Linux. Owners of such processors should
  58  *      contact AMD for precise details and a CPU swap.
  59  *
  60  *      See     http://www.multimania.com/poulot/k6bug.html
  61  *      and     section 2.6.2 of "AMD-K6 Processor Revision Guide - Model 6"
  62  *              (Publication # 21266  Issue Date: August 1998)
  63  *
  64  *      The following test is erm.. interesting. AMD neglected to up
  65  *      the chip setting when fixing the bug but they also tweaked some
  66  *      performance at the same time..
  67  */
  68
  69 extern __visible void vide(void);
  70 __asm__(".globl vide\n\t.align 4\nvide: ret");
  71
  72 static void init_amd_k5(struct cpuinfo_x86 *c)
  73 {
  74 /*
  75  * General Systems BIOSen alias the cpu frequency registers
  76  * of the Elan at 0x000df000. Unfortuantly, one of the Linux
  77  * drivers subsequently pokes it, and changes the CPU speed.
  78  * Workaround : Remove the unneeded alias.
  79  */
  80 #define CBAR            (0xfffc) /* Configuration Base Address  (32-bit) */
  81 #define CBAR_ENB        (0x80000000)
  82 #define CBAR_KEY        (0X000000CB)
  83         if (c->x86_model == 9 || c->x86_model == 10) {
  84                 if (inl(CBAR) & CBAR_ENB)
  85                         outl(0 | CBAR_KEY, CBAR);
  86         }
  87 }
  88
  89
  90 static void init_amd_k6(struct cpuinfo_x86 *c)
  91 {
  92         u32 l, h;
  93         int mbytes = get_num_physpages() >> (20-PAGE_SHIFT);
  94
  95         if (c->x86_model < 6) {
  96                 /* Based on AMD doc 20734R - June 2000 */
  97                 if (c->x86_model == 0) {
  98                         clear_cpu_cap(c, X86_FEATURE_APIC);
  99                         set_cpu_cap(c, X86_FEATURE_PGE);
 100                 }
 101                 return;
 102         }
 103
 104         if (c->x86_model == 6 && c->x86_mask == 1) {
 105                 const int K6_BUG_LOOP = 1000000;
 106                 int n;
 107                 void (*f_vide)(void);
 108                 unsigned long d, d2;
 109
 110                 printk(KERN_INFO "AMD K6 stepping B detected - ");
 111
 112                 /*
 113                  * It looks like AMD fixed the 2.6.2 bug and improved indirect
 114                  * calls at the same time.
 115                  */
 116
 117                 n = K6_BUG_LOOP;
 118                 f_vide = vide;
 119                 rdtscl(d);
 120                 while (n--)
 121                         f_vide();
 122                 rdtscl(d2);
 123                 d = d2-d;
 124
 125                 if (d > 20*K6_BUG_LOOP)
 126                         printk(KERN_CONT
 127                                 "system stability may be impaired when more than 32 MB are used.\n");
 128                 else
 129                         printk(KERN_CONT "probably OK (after B9730xxxx).\n");
 130         }
 131
 132         /* K6 with old style WHCR */
 133         if (c->x86_model < 8 ||
 134            (c->x86_model == 8 && c->x86_mask < 8)) {
 135                 /* We can only write allocate on the low 508Mb */
 136                 if (mbytes > 508)
 137                         mbytes = 508;
 138
 139                 rdmsr(MSR_K6_WHCR, l, h);
 140                 if ((l&0x0000FFFF) == 0) {
 141                         unsigned long flags;
 142                         l = (1<<0)|((mbytes/4)<<1);
 143                         local_irq_save(flags);
 144                         wbinvd();
 145                         wrmsr(MSR_K6_WHCR, l, h);
 146                         local_irq_restore(flags);
 147                         printk(KERN_INFO "Enabling old style K6 write allocation for %d Mb\n",
 148                                 mbytes);
 149                 }
 150                 return;
 151         }
 152
 153         if ((c->x86_model == 8 && c->x86_mask > 7) ||
 154              c->x86_model == 9 || c->x86_model == 13) {
 155                 /* The more serious chips .. */
 156
 157                 if (mbytes > 4092)
 158                         mbytes = 4092;
 159
 160                 rdmsr(MSR_K6_WHCR, l, h);
 161                 if ((l&0xFFFF0000) == 0) {
 162                         unsigned long flags;
 163                         l = ((mbytes>>2)<<22)|(1<<16);
 164                         local_irq_save(flags);
 165                         wbinvd();
 166                         wrmsr(MSR_K6_WHCR, l, h);
 167                         local_irq_restore(flags);
 168                         printk(KERN_INFO "Enabling new style K6 write allocation for %d Mb\n",
 169                                 mbytes);
 170                 }
 171
 172                 return;
 173         }
 174
 175         if (c->x86_model == 10) {
 176                 /* AMD Geode LX is model 10 */
 177                 /* placeholder for any needed mods */
 178                 return;
 179         }
 180 }
 181
 182 static void amd_k7_smp_check(struct cpuinfo_x86 *c)
 183 {
 184         /* calling is from identify_secondary_cpu() ? */
 185         if (!c->cpu_index)
 186                 return;
 187
 188         /*
 189          * Certain Athlons might work (for various values of 'work') in SMP
 190          * but they are not certified as MP capable.
 191          */
 192         /* Athlon 660/661 is valid. */
 193         if ((c->x86_model == 6) && ((c->x86_mask == 0) ||
 194             (c->x86_mask == 1)))
 195                 return;
 196
 197         /* Duron 670 is valid */
 198         if ((c->x86_model == 7) && (c->x86_mask == 0))
 199                 return;
 200
 201         /*
 202          * Athlon 662, Duron 671, and Athlon >model 7 have capability
 203          * bit. It's worth noting that the A5 stepping (662) of some
 204          * Athlon XP's have the MP bit set.
 205          * See http://www.heise.de/newsticker/data/jow-18.10.01-000 for
 206          * more.
 207          */
 208         if (((c->x86_model == 6) && (c->x86_mask >= 2)) ||
 209             ((c->x86_model == 7) && (c->x86_mask >= 1)) ||
 210              (c->x86_model > 7))
 211                 if (cpu_has_mp)
 212                         return;
 213
 214         /* If we get here, not a certified SMP capable AMD system. */
 215
 216         /*
 217          * Don't taint if we are running SMP kernel on a single non-MP
 218          * approved Athlon
 219          */
 220         WARN_ONCE(1, "WARNING: This combination of AMD"
 221                 " processors is not suitable for SMP.\n");
 222         add_taint(TAINT_UNSAFE_SMP, LOCKDEP_NOW_UNRELIABLE);
 223 }
 224
 225 static void init_amd_k7(struct cpuinfo_x86 *c)
 226 {
 227         u32 l, h;
 228
 229         /*
 230          * Bit 15 of Athlon specific MSR 15, needs to be 0
 231          * to enable SSE on Palomino/Morgan/Barton CPU's.
 232          * If the BIOS didn't enable it already, enable it here.
 233          */
 234         if (c->x86_model >= 6 && c->x86_model <= 10) {
 235                 if (!cpu_has(c, X86_FEATURE_XMM)) {
 236                         printk(KERN_INFO "Enabling disabled K7/SSE Support.\n");
 237                         rdmsr(MSR_K7_HWCR, l, h);
 238                         l &= ~0x00008000;
 239                         wrmsr(MSR_K7_HWCR, l, h);
 240                         set_cpu_cap(c, X86_FEATURE_XMM);
 241                 }
 242         }
 243
 244         /*
 245          * It's been determined by AMD that Athlons since model 8 stepping 1
 246          * are more robust with CLK_CTL set to 200xxxxx instead of 600xxxxx
 247          * As per AMD technical note 27212 0.2
 248          */
 249         if ((c->x86_model == 8 && c->x86_mask >= 1) || (c->x86_model > 8)) {
 250                 rdmsr(MSR_K7_CLK_CTL, l, h);
 251                 if ((l & 0xfff00000) != 0x20000000) {
 252                         printk(KERN_INFO
 253                             "CPU: CLK_CTL MSR was %x. Reprogramming to %x\n",
 254                                         l, ((l & 0x000fffff)|0x20000000));
 255                         wrmsr(MSR_K7_CLK_CTL, (l & 0x000fffff)|0x20000000, h);
 256                 }
 257         }
 258
 259         set_cpu_cap(c, X86_FEATURE_K7);
 260
 261         amd_k7_smp_check(c);
 262 }
 263 #endif
 264
 265 #ifdef CONFIG_NUMA
 266 /*
 267  * To workaround broken NUMA config.  Read the comment in
 268  * srat_detect_node().
 269  */
 270 static int nearby_node(int apicid)
 271 {
 272         int i, node;
 273
 274         for (i = apicid - 1; i >= 0; i--) {
 275                 node = __apicid_to_node[i];
 276                 if (node != NUMA_NO_NODE && node_online(node))
 277                         return node;
 278         }
 279         for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) {
 280                 node = __apicid_to_node[i];
 281                 if (node != NUMA_NO_NODE && node_online(node))
 282                         return node;
 283         }
 284         return first_node(node_online_map); /* Shouldn't happen */
 285 }
 286 #endif
 287
 288 /*
 289  * Fixup core topology information for
 290  * (1) AMD multi-node processors
 291  *     Assumption: Number of cores in each internal node is the same.
 292  * (2) AMD processors supporting compute units
 293  */
 294 #ifdef CONFIG_X86_HT
 295 static void amd_get_topology(struct cpuinfo_x86 *c)
 296 {
 297         u32 nodes, cores_per_cu = 1;
 298         u8 node_id;
 299         int cpu = smp_processor_id();
 300
 301         /* get information required for multi-node processors */
 302         if (cpu_has_topoext) {
 303                 u32 eax, ebx, ecx, edx;
 304
 305                 cpuid(0x8000001e, &eax, &ebx, &ecx, &edx);
 306                 nodes = ((ecx >> 8) & 7) + 1;
 307                 node_id = ecx & 7;
 308
 309                 /* get compute unit information */
 310                 smp_num_siblings = ((ebx >> 8) & 3) + 1;
 311                 c->compute_unit_id = ebx & 0xff;
 312                 cores_per_cu += ((ebx >> 8) & 3);
 313         } else if (cpu_has(c, X86_FEATURE_NODEID_MSR)) {
 314                 u64 value;
 315
 316                 rdmsrl(MSR_FAM10H_NODE_ID, value);
 317                 nodes = ((value >> 3) & 7) + 1;
 318                 node_id = value & 7;
 319         } else
 320                 return;
 321
 322         /* fixup multi-node processor information */
 323         if (nodes > 1) {
 324                 u32 cores_per_node;
 325                 u32 cus_per_node;
 326
 327                 set_cpu_cap(c, X86_FEATURE_AMD_DCM);
 328                 cores_per_node = c->x86_max_cores / nodes;
 329                 cus_per_node = cores_per_node / cores_per_cu;
 330
 331                 /* store NodeID, use llc_shared_map to store sibling info */
 332                 per_cpu(cpu_llc_id, cpu) = node_id;
 333
 334                 /* core id has to be in the [0 .. cores_per_node - 1] range */
 335                 c->cpu_core_id %= cores_per_node;
 336                 c->compute_unit_id %= cus_per_node;
 337         }
 338 }
 339 #endif
 340
 341 /*
 342  * On a AMD dual core setup the lower bits of the APIC id distingush the cores.
 343  * Assumes number of cores is a power of two.
 344  */
 345 static void amd_detect_cmp(struct cpuinfo_x86 *c)
 346 {
 347 #ifdef CONFIG_X86_HT
 348         unsigned bits;
 349         int cpu = smp_processor_id();
 350
 351         bits = c->x86_coreid_bits;
 352         /* Low order bits define the core id (index of core in socket) */
 353         c->cpu_core_id = c->initial_apicid & ((1 << bits)-1);
 354         /* Convert the initial APIC ID into the socket ID */
 355         c->phys_proc_id = c->initial_apicid >> bits;
 356         /* use socket ID also for last level cache */
 357         per_cpu(cpu_llc_id, cpu) = c->phys_proc_id;
 358         amd_get_topology(c);
 359 #endif
 360 }
 361
 362 u16 amd_get_nb_id(int cpu)
 363 {
 364         u16 id = 0;
 365 #ifdef CONFIG_SMP
 366         id = per_cpu(cpu_llc_id, cpu);
 367 #endif
 368         return id;
 369 }
 370 EXPORT_SYMBOL_GPL(amd_get_nb_id);
 371
 372 static void srat_detect_node(struct cpuinfo_x86 *c)
 373 {
 374 #ifdef CONFIG_NUMA
 375         int cpu = smp_processor_id();
 376         int node;
 377         unsigned apicid = c->apicid;
 378
 379         node = numa_cpu_node(cpu);
 380         if (node == NUMA_NO_NODE)
 381                 node = per_cpu(cpu_llc_id, cpu);
 382
 383         /*
 384          * On multi-fabric platform (e.g. Numascale NumaChip) a
 385          * platform-specific handler needs to be called to fixup some
 386          * IDs of the CPU.
 387          */
 388         if (x86_cpuinit.fixup_cpu_id)
 389                 x86_cpuinit.fixup_cpu_id(c, node);
 390
 391         if (!node_online(node)) {
 392                 /*
 393                  * Two possibilities here:
 394                  *
 395                  * - The CPU is missing memory and no node was created.  In
 396                  *   that case try picking one from a nearby CPU.
 397                  *
 398                  * - The APIC IDs differ from the HyperTransport node IDs
 399                  *   which the K8 northbridge parsing fills in.  Assume
 400                  *   they are all increased by a constant offset, but in
 401                  *   the same order as the HT nodeids.  If that doesn't
 402                  *   result in a usable node fall back to the path for the
 403                  *   previous case.
 404                  *
 405                  * This workaround operates directly on the mapping between
 406                  * APIC ID and NUMA node, assuming certain relationship
 407                  * between APIC ID, HT node ID and NUMA topology.  As going
 408                  * through CPU mapping may alter the outcome, directly
 409                  * access __apicid_to_node[].
 410                  */
 411                 int ht_nodeid = c->initial_apicid;
 412
 413                 if (ht_nodeid >= 0 &&
 414                     __apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
 415                         node = __apicid_to_node[ht_nodeid];
 416                 /* Pick a nearby node */
 417                 if (!node_online(node))
 418                         node = nearby_node(apicid);
 419         }
 420         numa_set_node(cpu, node);
 421 #endif
 422 }
 423
 424 static void early_init_amd_mc(struct cpuinfo_x86 *c)
 425 {
 426 #ifdef CONFIG_X86_HT
 427         unsigned bits, ecx;
 428
 429         /* Multi core CPU? */
 430         if (c->extended_cpuid_level < 0x80000008)
 431                 return;
 432
 433         ecx = cpuid_ecx(0x80000008);
 434
 435         c->x86_max_cores = (ecx & 0xff) + 1;
 436
 437         /* CPU telling us the core id bits shift? */
 438         bits = (ecx >> 12) & 0xF;
 439
 440         /* Otherwise recompute */
 441         if (bits == 0) {
 442                 while ((1 << bits) < c->x86_max_cores)
 443                         bits++;
 444         }
 445
 446         c->x86_coreid_bits = bits;
 447 #endif
 448 }
 449
 450 static void bsp_init_amd(struct cpuinfo_x86 *c)
 451 {
 452         if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) {
 453
 454                 if (c->x86 > 0x10 ||
 455                     (c->x86 == 0x10 && c->x86_model >= 0x2)) {
 456                         u64 val;
 457
 458                         rdmsrl(MSR_K7_HWCR, val);
 459                         if (!(val & BIT(24)))
 460                                 printk(KERN_WARNING FW_BUG "TSC doesn't count "
 461                                         "with P0 frequency!\n");
 462                 }
 463         }
 464
 465         if (c->x86 == 0x15) {
 466                 unsigned long upperbit;
 467                 u32 cpuid, assoc;
 468
 469                 cpuid    = cpuid_edx(0x80000005);
 470                 assoc    = cpuid >> 16 & 0xff;
 471                 upperbit = ((cpuid >> 24) << 10) / assoc;
 472
 473                 va_align.mask     = (upperbit - 1) & PAGE_MASK;
 474                 va_align.flags    = ALIGN_VA_32 | ALIGN_VA_64;
 475         }
 476 }
 477
 478 static void early_init_amd(struct cpuinfo_x86 *c)
 479 {
 480         early_init_amd_mc(c);
 481
 482         /*
 483          * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
 484          * with P/T states and does not stop in deep C-states
 485          */
 486         if (c->x86_power & (1 << 8)) {
 487                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
 488                 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
 489                 if (!check_tsc_unstable())
 490                         sched_clock_stable = 1;
 491         }
 492
 493 #ifdef CONFIG_X86_64
 494         set_cpu_cap(c, X86_FEATURE_SYSCALL32);
 495 #else
 496         /*  Set MTRR capability flag if appropriate */
 497         if (c->x86 == 5)
 498                 if (c->x86_model == 13 || c->x86_model == 9 ||
 499                     (c->x86_model == 8 && c->x86_mask >= 8))
 500                         set_cpu_cap(c, X86_FEATURE_K6_MTRR);
 501 #endif
 502 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_PCI)
 503         /* check CPU config space for extended APIC ID */
 504         if (cpu_has_apic && c->x86 >= 0xf) {
 505                 unsigned int val;
 506                 val = read_pci_config(0, 24, 0, 0x68);
 507                 if ((val & ((1 << 17) | (1 << 18))) == ((1 << 17) | (1 << 18)))
 508                         set_cpu_cap(c, X86_FEATURE_EXTD_APICID);
 509         }
 510 #endif
 511
 512         /* F16h erratum 793, CVE-2013-6885 */
 513         if (c->x86 == 0x16 && c->x86_model <= 0xf) {
 514                 u64 val;
 515
 516                 rdmsrl(MSR_AMD64_LS_CFG, val);
 517                 if (!(val & BIT(15)))
 518                         wrmsrl(MSR_AMD64_LS_CFG, val | BIT(15));
 519         }
 520
 521 }
 522
 523 static const int amd_erratum_383[];
 524 static const int amd_erratum_400[];
 525 static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum);
 526
 527 static void init_amd(struct cpuinfo_x86 *c)
 528 {
 529         u32 dummy;
 530         unsigned long long value;
 531
 532 #ifdef CONFIG_SMP
 533         /*
 534          * Disable TLB flush filter by setting HWCR.FFDIS on K8
 535          * bit 6 of msr C001_0015
 536          *
 537          * Errata 63 for SH-B3 steppings
 538          * Errata 122 for all steppings (F+ have it disabled by default)
 539          */
 540         if (c->x86 == 0xf) {
 541                 rdmsrl(MSR_K7_HWCR, value);
 542                 value |= 1 << 6;
 543                 wrmsrl(MSR_K7_HWCR, value);
 544         }
 545 #endif
 546
 547         early_init_amd(c);
 548
 549         /*
 550          * Bit 31 in normal CPUID used for nonstandard 3DNow ID;
 551          * 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway
 552          */
 553         clear_cpu_cap(c, 0*32+31);
 554
 555 #ifdef CONFIG_X86_64
 556         /* On C+ stepping K8 rep microcode works well for copy/memset */
 557         if (c->x86 == 0xf) {
 558                 u32 level;
 559
 560                 level = cpuid_eax(1);
 561                 if ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58)
 562                         set_cpu_cap(c, X86_FEATURE_REP_GOOD);
 563
 564                 /*
 565                  * Some BIOSes incorrectly force this feature, but only K8
 566                  * revision D (model = 0x14) and later actually support it.
 567                  * (AMD Erratum #110, docId: 25759).
 568                  */
 569                 if (c->x86_model < 0x14 && cpu_has(c, X86_FEATURE_LAHF_LM)) {
 570                         clear_cpu_cap(c, X86_FEATURE_LAHF_LM);
 571                         if (!rdmsrl_amd_safe(0xc001100d, &value)) {
 572                                 value &= ~(1ULL << 32);
 573                                 wrmsrl_amd_safe(0xc001100d, value);
 574                         }
 575                 }
 576
 577         }
 578         if (c->x86 >= 0x10)
 579                 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
 580
 581         /* get apicid instead of initial apic id from cpuid */
 582         c->apicid = hard_smp_processor_id();
 583 #else
 584
 585         /*
 586          *      FIXME: We should handle the K5 here. Set up the write
 587          *      range and also turn on MSR 83 bits 4 and 31 (write alloc,
 588          *      no bus pipeline)
 589          */
 590
 591         switch (c->x86) {
 592         case 4:
 593                 init_amd_k5(c);
 594                 break;
 595         case 5:
 596                 init_amd_k6(c);
 597                 break;
 598         case 6: /* An Athlon/Duron */
 599                 init_amd_k7(c);
 600                 break;
 601         }
 602
 603         /* K6s reports MCEs but don't actually have all the MSRs */
 604         if (c->x86 < 6)
 605                 clear_cpu_cap(c, X86_FEATURE_MCE);
 606 #endif
 607
 608         /* Enable workaround for FXSAVE leak */
 609         if (c->x86 >= 6)
 610                 set_cpu_cap(c, X86_FEATURE_FXSAVE_LEAK);
 611
 612         if (!c->x86_model_id[0]) {
 613                 switch (c->x86) {
 614                 case 0xf:
 615                         /* Should distinguish Models here, but this is only
 616                            a fallback anyways. */
 617                         strcpy(c->x86_model_id, "Hammer");
 618                         break;
 619                 }
 620         }
 621
 622         /* re-enable TopologyExtensions if switched off by BIOS */
 623         if ((c->x86 == 0x15) &&
 624             (c->x86_model >= 0x10) && (c->x86_model <= 0x1f) &&
 625             !cpu_has(c, X86_FEATURE_TOPOEXT)) {
 626
 627                 if (!rdmsrl_safe(0xc0011005, &value)) {
 628                         value |= 1ULL << 54;
 629                         wrmsrl_safe(0xc0011005, value);
 630                         rdmsrl(0xc0011005, value);
 631                         if (value & (1ULL << 54)) {
 632                                 set_cpu_cap(c, X86_FEATURE_TOPOEXT);
 633                                 printk(KERN_INFO FW_INFO "CPU: Re-enabling "
 634                                   "disabled Topology Extensions Support\n");
 635                         }
 636                 }
 637         }
 638
 639         /*
 640          * The way access filter has a performance penalty on some workloads.
 641          * Disable it on the affected CPUs.
 642          */
 643         if ((c->x86 == 0x15) &&
 644             (c->x86_model >= 0x02) && (c->x86_model < 0x20)) {
 645
 646                 if (!rdmsrl_safe(0xc0011021, &value) && !(value & 0x1E)) {
 647                         value |= 0x1E;
 648                         wrmsrl_safe(0xc0011021, value);
 649                 }
 650         }
 651
 652         cpu_detect_cache_sizes(c);
 653
 654         /* Multi core CPU? */
 655         if (c->extended_cpuid_level >= 0x80000008) {
 656                 amd_detect_cmp(c);
 657                 srat_detect_node(c);
 658         }
 659
 660 #ifdef CONFIG_X86_32
 661         detect_ht(c);
 662 #endif
 663
 664         init_amd_cacheinfo(c);
 665
 666         if (c->x86 >= 0xf)
 667                 set_cpu_cap(c, X86_FEATURE_K8);
 668
 669         if (cpu_has_xmm2) {
 670                 /* MFENCE stops RDTSC speculation */
 671                 set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);
 672         }
 673
 674 #ifdef CONFIG_X86_64
 675         if (c->x86 == 0x10) {
 676                 /* do this for boot cpu */
 677                 if (c == &boot_cpu_data)
 678                         check_enable_amd_mmconf_dmi();
 679
 680                 fam10h_check_enable_mmcfg();
 681         }
 682
 683         if (c == &boot_cpu_data && c->x86 >= 0xf) {
 684                 unsigned long long tseg;
 685
 686                 /*
 687                  * Split up direct mapping around the TSEG SMM area.
 688                  * Don't do it for gbpages because there seems very little
 689                  * benefit in doing so.
 690                  */
 691                 if (!rdmsrl_safe(MSR_K8_TSEG_ADDR, &tseg)) {
 692                         unsigned long pfn = tseg >> PAGE_SHIFT;
 693
 694                         printk(KERN_DEBUG "tseg: %010llx\n", tseg);
 695                         if (pfn_range_is_mapped(pfn, pfn + 1))
 696                                 set_memory_4k((unsigned long)__va(tseg), 1);
 697                 }
 698         }
 699 #endif
 700
 701         /*
 702          * Family 0x12 and above processors have APIC timer
 703          * running in deep C states.
 704          */
 705         if (c->x86 > 0x11)
 706                 set_cpu_cap(c, X86_FEATURE_ARAT);
 707
 708         if (c->x86 == 0x10) {
 709                 /*
 710                  * Disable GART TLB Walk Errors on Fam10h. We do this here
 711                  * because this is always needed when GART is enabled, even in a
 712                  * kernel which has no MCE support built in.
 713                  * BIOS should disable GartTlbWlk Errors themself. If
 714                  * it doesn't do it here as suggested by the BKDG.
 715                  *
 716                  * Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=33012
 717                  */
 718                 u64 mask;
 719                 int err;
 720
 721                 err = rdmsrl_safe(MSR_AMD64_MCx_MASK(4), &mask);
 722                 if (err == 0) {
 723                         mask |= (1 << 10);
 724                         wrmsrl_safe(MSR_AMD64_MCx_MASK(4), mask);
 725                 }
 726
 727                 /*
 728                  * On family 10h BIOS may not have properly enabled WC+ support,
 729                  * causing it to be converted to CD memtype. This may result in
 730                  * performance degradation for certain nested-paging guests.
 731                  * Prevent this conversion by clearing bit 24 in
 732                  * MSR_AMD64_BU_CFG2.
 733                  *
 734                  * NOTE: we want to use the _safe accessors so as not to #GP kvm
 735                  * guests on older kvm hosts.
 736                  */
 737
 738                 rdmsrl_safe(MSR_AMD64_BU_CFG2, &value);
 739                 value &= ~(1ULL << 24);
 740                 wrmsrl_safe(MSR_AMD64_BU_CFG2, value);
 741
 742                 if (cpu_has_amd_erratum(c, amd_erratum_383))
 743                         set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH);
 744         }
 745
 746         if (cpu_has_amd_erratum(c, amd_erratum_400))
 747                 set_cpu_bug(c, X86_BUG_AMD_APIC_C1E);
 748
 749         rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);
 750 }
 751
 752 #ifdef CONFIG_X86_32
 753 static unsigned int amd_size_cache(struct cpuinfo_x86 *c, unsigned int size)
 754 {
 755         /* AMD errata T13 (order #21922) */
 756         if ((c->x86 == 6)) {
 757                 /* Duron Rev A0 */
 758                 if (c->x86_model == 3 && c->x86_mask == 0)
 759                         size = 64;
 760                 /* Tbird rev A1/A2 */
 761                 if (c->x86_model == 4 &&
 762                         (c->x86_mask == 0 || c->x86_mask == 1))
 763                         size = 256;
 764         }
 765         return size;
 766 }
 767 #endif
 768
 769 static void cpu_set_tlb_flushall_shift(struct cpuinfo_x86 *c)
 770 {
 771         tlb_flushall_shift = 5;
 772
 773         if (c->x86 <= 0x11)
 774                 tlb_flushall_shift = 4;
 775 }
 776
 777 static void cpu_detect_tlb_amd(struct cpuinfo_x86 *c)
 778 {
 779         u32 ebx, eax, ecx, edx;
 780         u16 mask = 0xfff;
 781
 782         if (c->x86 < 0xf)
 783                 return;
 784
 785         if (c->extended_cpuid_level < 0x80000006)
 786                 return;
 787
 788         cpuid(0x80000006, &eax, &ebx, &ecx, &edx);
 789
 790         tlb_lld_4k[ENTRIES] = (ebx >> 16) & mask;
 791         tlb_lli_4k[ENTRIES] = ebx & mask;
 792
 793         /*
 794          * K8 doesn't have 2M/4M entries in the L2 TLB so read out the L1 TLB
 795          * characteristics from the CPUID function 0x80000005 instead.
 796          */
 797         if (c->x86 == 0xf) {
 798                 cpuid(0x80000005, &eax, &ebx, &ecx, &edx);
 799                 mask = 0xff;
 800         }
 801
 802         /* Handle DTLB 2M and 4M sizes, fall back to L1 if L2 is disabled */
 803         if (!((eax >> 16) & mask)) {
 804                 u32 a, b, c, d;
 805
 806                 cpuid(0x80000005, &a, &b, &c, &d);
 807                 tlb_lld_2m[ENTRIES] = (a >> 16) & 0xff;
 808         } else {
 809                 tlb_lld_2m[ENTRIES] = (eax >> 16) & mask;
 810         }
 811
 812         /* a 4M entry uses two 2M entries */
 813         tlb_lld_4m[ENTRIES] = tlb_lld_2m[ENTRIES] >> 1;
 814
 815         /* Handle ITLB 2M and 4M sizes, fall back to L1 if L2 is disabled */
 816         if (!(eax & mask)) {
 817                 /* Erratum 658 */
 818                 if (c->x86 == 0x15 && c->x86_model <= 0x1f) {
 819                         tlb_lli_2m[ENTRIES] = 1024;
 820                 } else {
 821                         cpuid(0x80000005, &eax, &ebx, &ecx, &edx);
 822                         tlb_lli_2m[ENTRIES] = eax & 0xff;
 823                 }
 824         } else
 825                 tlb_lli_2m[ENTRIES] = eax & mask;
 826
 827         tlb_lli_4m[ENTRIES] = tlb_lli_2m[ENTRIES] >> 1;
 828
 829         cpu_set_tlb_flushall_shift(c);
 830 }
 831
 832 static const struct cpu_dev amd_cpu_dev = {
 833         .c_vendor       = "AMD",
 834         .c_ident        = { "AuthenticAMD" },
 835 #ifdef CONFIG_X86_32
 836         .c_models = {
 837                 { .vendor = X86_VENDOR_AMD, .family = 4, .model_names =
 838                   {
 839                           [3] = "486 DX/2",
 840                           [7] = "486 DX/2-WB",
 841                           [8] = "486 DX/4",
 842                           [9] = "486 DX/4-WB",
 843                           [14] = "Am5x86-WT",
 844                           [15] = "Am5x86-WB"
 845                   }
 846                 },
 847         },
 848         .c_size_cache   = amd_size_cache,
 849 #endif
 850         .c_early_init   = early_init_amd,
 851         .c_detect_tlb   = cpu_detect_tlb_amd,
 852         .c_bsp_init     = bsp_init_amd,
 853         .c_init         = init_amd,
 854         .c_x86_vendor   = X86_VENDOR_AMD,
 855 };
 856
 857 cpu_dev_register(amd_cpu_dev);
 858
 859 /*
 860  * AMD errata checking
 861  *
 862  * Errata are defined as arrays of ints using the AMD_LEGACY_ERRATUM() or
 863  * AMD_OSVW_ERRATUM() macros. The latter is intended for newer errata that
 864  * have an OSVW id assigned, which it takes as first argument. Both take a
 865  * variable number of family-specific model-stepping ranges created by
 866  * AMD_MODEL_RANGE().
 867  *
 868  * Example:
 869  *
 870  * const int amd_erratum_319[] =
 871  *      AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0x4, 0x2),
 872  *                         AMD_MODEL_RANGE(0x10, 0x8, 0x0, 0x8, 0x0),
 873  *                         AMD_MODEL_RANGE(0x10, 0x9, 0x0, 0x9, 0x0));
 874  */
 875
 876 #define AMD_LEGACY_ERRATUM(...)         { -1, __VA_ARGS__, 0 }
 877 #define AMD_OSVW_ERRATUM(osvw_id, ...)  { osvw_id, __VA_ARGS__, 0 }
 878 #define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \
 879         ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end))
 880 #define AMD_MODEL_RANGE_FAMILY(range)   (((range) >> 24) & 0xff)
 881 #define AMD_MODEL_RANGE_START(range)    (((range) >> 12) & 0xfff)
 882 #define AMD_MODEL_RANGE_END(range)      ((range) & 0xfff)
 883
 884 static const int amd_erratum_400[] =
 885         AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
 886                             AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
 887
 888 static const int amd_erratum_383[] =
 889         AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0, 0, 0xff, 0xf));
 890
 891
 892 static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)
 893 {
 894         int osvw_id = *erratum++;
 895         u32 range;
 896         u32 ms;
 897
 898         if (osvw_id >= 0 && osvw_id < 65536 &&
 899             cpu_has(cpu, X86_FEATURE_OSVW)) {
 900                 u64 osvw_len;
 901
 902                 rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, osvw_len);
 903                 if (osvw_id < osvw_len) {
 904                         u64 osvw_bits;
 905
 906                         rdmsrl(MSR_AMD64_OSVW_STATUS + (osvw_id >> 6),
 907                             osvw_bits);
 908                         return osvw_bits & (1ULL << (osvw_id & 0x3f));
 909                 }
 910         }
 911
 912         /* OSVW unavailable or ID unknown, match family-model-stepping range */
 913         ms = (cpu->x86_model << 4) | cpu->x86_mask;
 914         while ((range = *erratum++))
 915                 if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) &&
 916                     (ms >= AMD_MODEL_RANGE_START(range)) &&
 917                     (ms <= AMD_MODEL_RANGE_END(range)))
 918                         return true;
 919
 920         return false;
 921 }