1 #include <linux/export.h>
2 #include <linux/bitops.h>
7 #include <linux/sched.h>
8 #include <linux/sched/clock.h>
9 #include <linux/random.h>
10 #include <asm/processor.h>
12 #include <asm/cacheinfo.h>
14 #include <asm/spec-ctrl.h>
16 #include <asm/pci-direct.h>
17 #include <asm/delay.h>
20 # include <asm/mmconfig.h>
21 # include <asm/set_memory.h>
26 static const int amd_erratum_383[];
27 static const int amd_erratum_400[];
28 static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum);
31 * nodes_per_socket: Stores the number of nodes per socket.
32 * Refer to Fam15h Models 00-0fh BKDG - CPUID Fn8000_001E_ECX
33 * Node Identifiers[10:8]
35 static u32 nodes_per_socket = 1;
37 static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)
42 WARN_ONCE((boot_cpu_data.x86 != 0xf),
43 "%s should only be used on K8!\n", __func__);
48 err = rdmsr_safe_regs(gprs);
50 *p = gprs[0] | ((u64)gprs[2] << 32);
55 static inline int wrmsrl_amd_safe(unsigned msr, unsigned long long val)
59 WARN_ONCE((boot_cpu_data.x86 != 0xf),
60 "%s should only be used on K8!\n", __func__);
67 return wrmsr_safe_regs(gprs);
71 * B step AMD K6 before B 9730xxxx have hardware bugs that can cause
72 * misexecution of code under Linux. Owners of such processors should
73 * contact AMD for precise details and a CPU swap.
75 * See http://www.multimania.com/poulot/k6bug.html
76 * and section 2.6.2 of "AMD-K6 Processor Revision Guide - Model 6"
77 * (Publication # 21266 Issue Date: August 1998)
79 * The following test is erm.. interesting. AMD neglected to up
80 * the chip setting when fixing the bug but they also tweaked some
81 * performance at the same time..
84 extern __visible void vide(void);
85 __asm__(".globl vide\n"
86 ".type vide, @function\n"
90 static void init_amd_k5(struct cpuinfo_x86 *c)
94 * General Systems BIOSen alias the cpu frequency registers
95 * of the Elan at 0x000df000. Unfortunately, one of the Linux
96 * drivers subsequently pokes it, and changes the CPU speed.
97 * Workaround : Remove the unneeded alias.
99 #define CBAR (0xfffc) /* Configuration Base Address (32-bit) */
100 #define CBAR_ENB (0x80000000)
101 #define CBAR_KEY (0X000000CB)
102 if (c->x86_model == 9 || c->x86_model == 10) {
103 if (inl(CBAR) & CBAR_ENB)
104 outl(0 | CBAR_KEY, CBAR);
109 static void init_amd_k6(struct cpuinfo_x86 *c)
113 int mbytes = get_num_physpages() >> (20-PAGE_SHIFT);
115 if (c->x86_model < 6) {
116 /* Based on AMD doc 20734R - June 2000 */
117 if (c->x86_model == 0) {
118 clear_cpu_cap(c, X86_FEATURE_APIC);
119 set_cpu_cap(c, X86_FEATURE_PGE);
124 if (c->x86_model == 6 && c->x86_stepping == 1) {
125 const int K6_BUG_LOOP = 1000000;
127 void (*f_vide)(void);
130 pr_info("AMD K6 stepping B detected - ");
133 * It looks like AMD fixed the 2.6.2 bug and improved indirect
134 * calls at the same time.
139 OPTIMIZER_HIDE_VAR(f_vide);
146 if (d > 20*K6_BUG_LOOP)
147 pr_cont("system stability may be impaired when more than 32 MB are used.\n");
149 pr_cont("probably OK (after B9730xxxx).\n");
152 /* K6 with old style WHCR */
153 if (c->x86_model < 8 ||
154 (c->x86_model == 8 && c->x86_stepping < 8)) {
155 /* We can only write allocate on the low 508Mb */
159 rdmsr(MSR_K6_WHCR, l, h);
160 if ((l&0x0000FFFF) == 0) {
162 l = (1<<0)|((mbytes/4)<<1);
163 local_irq_save(flags);
165 wrmsr(MSR_K6_WHCR, l, h);
166 local_irq_restore(flags);
167 pr_info("Enabling old style K6 write allocation for %d Mb\n",
173 if ((c->x86_model == 8 && c->x86_stepping > 7) ||
174 c->x86_model == 9 || c->x86_model == 13) {
175 /* The more serious chips .. */
180 rdmsr(MSR_K6_WHCR, l, h);
181 if ((l&0xFFFF0000) == 0) {
183 l = ((mbytes>>2)<<22)|(1<<16);
184 local_irq_save(flags);
186 wrmsr(MSR_K6_WHCR, l, h);
187 local_irq_restore(flags);
188 pr_info("Enabling new style K6 write allocation for %d Mb\n",
195 if (c->x86_model == 10) {
196 /* AMD Geode LX is model 10 */
197 /* placeholder for any needed mods */
203 static void init_amd_k7(struct cpuinfo_x86 *c)
209 * Bit 15 of Athlon specific MSR 15, needs to be 0
210 * to enable SSE on Palomino/Morgan/Barton CPU's.
211 * If the BIOS didn't enable it already, enable it here.
213 if (c->x86_model >= 6 && c->x86_model <= 10) {
214 if (!cpu_has(c, X86_FEATURE_XMM)) {
215 pr_info("Enabling disabled K7/SSE Support.\n");
216 msr_clear_bit(MSR_K7_HWCR, 15);
217 set_cpu_cap(c, X86_FEATURE_XMM);
222 * It's been determined by AMD that Athlons since model 8 stepping 1
223 * are more robust with CLK_CTL set to 200xxxxx instead of 600xxxxx
224 * As per AMD technical note 27212 0.2
226 if ((c->x86_model == 8 && c->x86_stepping >= 1) || (c->x86_model > 8)) {
227 rdmsr(MSR_K7_CLK_CTL, l, h);
228 if ((l & 0xfff00000) != 0x20000000) {
229 pr_info("CPU: CLK_CTL MSR was %x. Reprogramming to %x\n",
230 l, ((l & 0x000fffff)|0x20000000));
231 wrmsr(MSR_K7_CLK_CTL, (l & 0x000fffff)|0x20000000, h);
235 set_cpu_cap(c, X86_FEATURE_K7);
237 /* calling is from identify_secondary_cpu() ? */
242 * Certain Athlons might work (for various values of 'work') in SMP
243 * but they are not certified as MP capable.
245 /* Athlon 660/661 is valid. */
246 if ((c->x86_model == 6) && ((c->x86_stepping == 0) ||
247 (c->x86_stepping == 1)))
250 /* Duron 670 is valid */
251 if ((c->x86_model == 7) && (c->x86_stepping == 0))
255 * Athlon 662, Duron 671, and Athlon >model 7 have capability
256 * bit. It's worth noting that the A5 stepping (662) of some
257 * Athlon XP's have the MP bit set.
258 * See http://www.heise.de/newsticker/data/jow-18.10.01-000 for
261 if (((c->x86_model == 6) && (c->x86_stepping >= 2)) ||
262 ((c->x86_model == 7) && (c->x86_stepping >= 1)) ||
264 if (cpu_has(c, X86_FEATURE_MP))
267 /* If we get here, not a certified SMP capable AMD system. */
270 * Don't taint if we are running SMP kernel on a single non-MP
273 WARN_ONCE(1, "WARNING: This combination of AMD"
274 " processors is not suitable for SMP.\n");
275 add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_NOW_UNRELIABLE);
281 * To workaround broken NUMA config. Read the comment in
282 * srat_detect_node().
284 static int nearby_node(int apicid)
288 for (i = apicid - 1; i >= 0; i--) {
289 node = __apicid_to_node[i];
290 if (node != NUMA_NO_NODE && node_online(node))
293 for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) {
294 node = __apicid_to_node[i];
295 if (node != NUMA_NO_NODE && node_online(node))
298 return first_node(node_online_map); /* Shouldn't happen */
303 * Fix up cpu_core_id for pre-F17h systems to be in the
304 * [0 .. cores_per_node - 1] range. Not really needed but
305 * kept so as not to break existing setups.
307 static void legacy_fixup_core_id(struct cpuinfo_x86 *c)
314 cus_per_node = c->x86_max_cores / nodes_per_socket;
315 c->cpu_core_id %= cus_per_node;
319 * Fixup core topology information for
320 * (1) AMD multi-node processors
321 * Assumption: Number of cores in each internal node is the same.
322 * (2) AMD processors supporting compute units
324 static void amd_get_topology(struct cpuinfo_x86 *c)
327 int cpu = smp_processor_id();
329 /* get information required for multi-node processors */
330 if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
332 u32 eax, ebx, ecx, edx;
334 cpuid(0x8000001e, &eax, &ebx, &ecx, &edx);
336 node_id = ecx & 0xff;
337 smp_num_siblings = ((ebx >> 8) & 0xff) + 1;
340 c->cu_id = ebx & 0xff;
342 if (c->x86 >= 0x17) {
343 c->cpu_core_id = ebx & 0xff;
345 if (smp_num_siblings > 1)
346 c->x86_max_cores /= smp_num_siblings;
350 * In case leaf B is available, use it to derive
351 * topology information.
353 err = detect_extended_topology(c);
355 c->x86_coreid_bits = get_count_order(c->x86_max_cores);
357 cacheinfo_amd_init_llc_id(c, cpu, node_id);
359 } else if (cpu_has(c, X86_FEATURE_NODEID_MSR)) {
362 rdmsrl(MSR_FAM10H_NODE_ID, value);
365 per_cpu(cpu_llc_id, cpu) = node_id;
369 if (nodes_per_socket > 1) {
370 set_cpu_cap(c, X86_FEATURE_AMD_DCM);
371 legacy_fixup_core_id(c);
376 * On a AMD dual core setup the lower bits of the APIC id distinguish the cores.
377 * Assumes number of cores is a power of two.
379 static void amd_detect_cmp(struct cpuinfo_x86 *c)
382 int cpu = smp_processor_id();
384 bits = c->x86_coreid_bits;
385 /* Low order bits define the core id (index of core in socket) */
386 c->cpu_core_id = c->initial_apicid & ((1 << bits)-1);
387 /* Convert the initial APIC ID into the socket ID */
388 c->phys_proc_id = c->initial_apicid >> bits;
389 /* use socket ID also for last level cache */
390 per_cpu(cpu_llc_id, cpu) = c->phys_proc_id;
393 u16 amd_get_nb_id(int cpu)
395 return per_cpu(cpu_llc_id, cpu);
397 EXPORT_SYMBOL_GPL(amd_get_nb_id);
399 u32 amd_get_nodes_per_socket(void)
401 return nodes_per_socket;
403 EXPORT_SYMBOL_GPL(amd_get_nodes_per_socket);
405 static void srat_detect_node(struct cpuinfo_x86 *c)
408 int cpu = smp_processor_id();
410 unsigned apicid = c->apicid;
412 node = numa_cpu_node(cpu);
413 if (node == NUMA_NO_NODE)
414 node = per_cpu(cpu_llc_id, cpu);
417 * On multi-fabric platform (e.g. Numascale NumaChip) a
418 * platform-specific handler needs to be called to fixup some
421 if (x86_cpuinit.fixup_cpu_id)
422 x86_cpuinit.fixup_cpu_id(c, node);
424 if (!node_online(node)) {
426 * Two possibilities here:
428 * - The CPU is missing memory and no node was created. In
429 * that case try picking one from a nearby CPU.
431 * - The APIC IDs differ from the HyperTransport node IDs
432 * which the K8 northbridge parsing fills in. Assume
433 * they are all increased by a constant offset, but in
434 * the same order as the HT nodeids. If that doesn't
435 * result in a usable node fall back to the path for the
438 * This workaround operates directly on the mapping between
439 * APIC ID and NUMA node, assuming certain relationship
440 * between APIC ID, HT node ID and NUMA topology. As going
441 * through CPU mapping may alter the outcome, directly
442 * access __apicid_to_node[].
444 int ht_nodeid = c->initial_apicid;
446 if (__apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
447 node = __apicid_to_node[ht_nodeid];
448 /* Pick a nearby node */
449 if (!node_online(node))
450 node = nearby_node(apicid);
452 numa_set_node(cpu, node);
456 static void early_init_amd_mc(struct cpuinfo_x86 *c)
461 /* Multi core CPU? */
462 if (c->extended_cpuid_level < 0x80000008)
465 ecx = cpuid_ecx(0x80000008);
467 c->x86_max_cores = (ecx & 0xff) + 1;
469 /* CPU telling us the core id bits shift? */
470 bits = (ecx >> 12) & 0xF;
472 /* Otherwise recompute */
474 while ((1 << bits) < c->x86_max_cores)
478 c->x86_coreid_bits = bits;
482 static void bsp_init_amd(struct cpuinfo_x86 *c)
487 unsigned long long tseg;
490 * Split up direct mapping around the TSEG SMM area.
491 * Don't do it for gbpages because there seems very little
492 * benefit in doing so.
494 if (!rdmsrl_safe(MSR_K8_TSEG_ADDR, &tseg)) {
495 unsigned long pfn = tseg >> PAGE_SHIFT;
497 pr_debug("tseg: %010llx\n", tseg);
498 if (pfn_range_is_mapped(pfn, pfn + 1))
499 set_memory_4k((unsigned long)__va(tseg), 1);
504 if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) {
507 (c->x86 == 0x10 && c->x86_model >= 0x2)) {
510 rdmsrl(MSR_K7_HWCR, val);
511 if (!(val & BIT(24)))
512 pr_warn(FW_BUG "TSC doesn't count with P0 frequency!\n");
516 if (c->x86 == 0x15) {
517 unsigned long upperbit;
520 cpuid = cpuid_edx(0x80000005);
521 assoc = cpuid >> 16 & 0xff;
522 upperbit = ((cpuid >> 24) << 10) / assoc;
524 va_align.mask = (upperbit - 1) & PAGE_MASK;
525 va_align.flags = ALIGN_VA_32 | ALIGN_VA_64;
527 /* A random value per boot for bit slice [12:upper_bit) */
528 va_align.bits = get_random_int() & va_align.mask;
531 if (cpu_has(c, X86_FEATURE_MWAITX))
534 if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
537 ecx = cpuid_ecx(0x8000001e);
538 nodes_per_socket = ((ecx >> 8) & 7) + 1;
539 } else if (boot_cpu_has(X86_FEATURE_NODEID_MSR)) {
542 rdmsrl(MSR_FAM10H_NODE_ID, value);
543 nodes_per_socket = ((value >> 3) & 7) + 1;
546 if (!boot_cpu_has(X86_FEATURE_AMD_SSBD) &&
547 !boot_cpu_has(X86_FEATURE_VIRT_SSBD) &&
548 c->x86 >= 0x15 && c->x86 <= 0x17) {
552 case 0x15: bit = 54; break;
553 case 0x16: bit = 33; break;
554 case 0x17: bit = 10; break;
558 * Try to cache the base value so further operations can
559 * avoid RMW. If that faults, do not enable SSBD.
561 if (!rdmsrl_safe(MSR_AMD64_LS_CFG, &x86_amd_ls_cfg_base)) {
562 setup_force_cpu_cap(X86_FEATURE_LS_CFG_SSBD);
563 setup_force_cpu_cap(X86_FEATURE_SSBD);
564 x86_amd_ls_cfg_ssbd_mask = 1ULL << bit;
569 static void early_detect_mem_encrypt(struct cpuinfo_x86 *c)
574 * BIOS support is required for SME and SEV.
575 * For SME: If BIOS has enabled SME then adjust x86_phys_bits by
576 * the SME physical address space reduction value.
577 * If BIOS has not enabled SME then don't advertise the
578 * SME feature (set in scattered.c).
579 * For SEV: If BIOS has not enabled SEV then don't advertise the
580 * SEV feature (set in scattered.c).
582 * In all cases, since support for SME and SEV requires long mode,
583 * don't advertise the feature under CONFIG_X86_32.
585 if (cpu_has(c, X86_FEATURE_SME) || cpu_has(c, X86_FEATURE_SEV)) {
586 /* Check if memory encryption is enabled */
587 rdmsrl(MSR_K8_SYSCFG, msr);
588 if (!(msr & MSR_K8_SYSCFG_MEM_ENCRYPT))
592 * Always adjust physical address bits. Even though this
593 * will be a value above 32-bits this is still done for
594 * CONFIG_X86_32 so that accurate values are reported.
596 c->x86_phys_bits -= (cpuid_ebx(0x8000001f) >> 6) & 0x3f;
598 if (IS_ENABLED(CONFIG_X86_32))
601 rdmsrl(MSR_K7_HWCR, msr);
602 if (!(msr & MSR_K7_HWCR_SMMLOCK))
608 clear_cpu_cap(c, X86_FEATURE_SME);
610 clear_cpu_cap(c, X86_FEATURE_SEV);
614 static void early_init_amd(struct cpuinfo_x86 *c)
618 early_init_amd_mc(c);
620 rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);
623 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
624 * with P/T states and does not stop in deep C-states
626 if (c->x86_power & (1 << 8)) {
627 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
628 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
631 /* Bit 12 of 8000_0007 edx is accumulated power mechanism. */
632 if (c->x86_power & BIT(12))
633 set_cpu_cap(c, X86_FEATURE_ACC_POWER);
636 set_cpu_cap(c, X86_FEATURE_SYSCALL32);
638 /* Set MTRR capability flag if appropriate */
640 if (c->x86_model == 13 || c->x86_model == 9 ||
641 (c->x86_model == 8 && c->x86_stepping >= 8))
642 set_cpu_cap(c, X86_FEATURE_K6_MTRR);
644 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_PCI)
646 * ApicID can always be treated as an 8-bit value for AMD APIC versions
647 * >= 0x10, but even old K8s came out of reset with version 0x10. So, we
648 * can safely set X86_FEATURE_EXTD_APICID unconditionally for families
651 if (boot_cpu_has(X86_FEATURE_APIC)) {
653 set_cpu_cap(c, X86_FEATURE_EXTD_APICID);
654 else if (c->x86 >= 0xf) {
655 /* check CPU config space for extended APIC ID */
658 val = read_pci_config(0, 24, 0, 0x68);
659 if ((val >> 17 & 0x3) == 0x3)
660 set_cpu_cap(c, X86_FEATURE_EXTD_APICID);
666 * This is only needed to tell the kernel whether to use VMCALL
667 * and VMMCALL. VMMCALL is never executed except under virt, so
668 * we can set it unconditionally.
670 set_cpu_cap(c, X86_FEATURE_VMMCALL);
672 /* F16h erratum 793, CVE-2013-6885 */
673 if (c->x86 == 0x16 && c->x86_model <= 0xf)
674 msr_set_bit(MSR_AMD64_LS_CFG, 15);
677 * Check whether the machine is affected by erratum 400. This is
678 * used to select the proper idle routine and to enable the check
679 * whether the machine is affected in arch_post_acpi_init(), which
680 * sets the X86_BUG_AMD_APIC_C1E bug depending on the MSR check.
682 if (cpu_has_amd_erratum(c, amd_erratum_400))
683 set_cpu_bug(c, X86_BUG_AMD_E400);
685 early_detect_mem_encrypt(c);
688 static void init_amd_k8(struct cpuinfo_x86 *c)
693 /* On C+ stepping K8 rep microcode works well for copy/memset */
694 level = cpuid_eax(1);
695 if ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58)
696 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
699 * Some BIOSes incorrectly force this feature, but only K8 revision D
700 * (model = 0x14) and later actually support it.
701 * (AMD Erratum #110, docId: 25759).
703 if (c->x86_model < 0x14 && cpu_has(c, X86_FEATURE_LAHF_LM)) {
704 clear_cpu_cap(c, X86_FEATURE_LAHF_LM);
705 if (!rdmsrl_amd_safe(0xc001100d, &value)) {
706 value &= ~BIT_64(32);
707 wrmsrl_amd_safe(0xc001100d, value);
711 if (!c->x86_model_id[0])
712 strcpy(c->x86_model_id, "Hammer");
716 * Disable TLB flush filter by setting HWCR.FFDIS on K8
717 * bit 6 of msr C001_0015
719 * Errata 63 for SH-B3 steppings
720 * Errata 122 for all steppings (F+ have it disabled by default)
722 msr_set_bit(MSR_K7_HWCR, 6);
724 set_cpu_bug(c, X86_BUG_SWAPGS_FENCE);
727 static void init_amd_gh(struct cpuinfo_x86 *c)
729 #ifdef CONFIG_MMCONF_FAM10H
730 /* do this for boot cpu */
731 if (c == &boot_cpu_data)
732 check_enable_amd_mmconf_dmi();
734 fam10h_check_enable_mmcfg();
738 * Disable GART TLB Walk Errors on Fam10h. We do this here because this
739 * is always needed when GART is enabled, even in a kernel which has no
740 * MCE support built in. BIOS should disable GartTlbWlk Errors already.
741 * If it doesn't, we do it here as suggested by the BKDG.
743 * Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=33012
745 msr_set_bit(MSR_AMD64_MCx_MASK(4), 10);
748 * On family 10h BIOS may not have properly enabled WC+ support, causing
749 * it to be converted to CD memtype. This may result in performance
750 * degradation for certain nested-paging guests. Prevent this conversion
751 * by clearing bit 24 in MSR_AMD64_BU_CFG2.
753 * NOTE: we want to use the _safe accessors so as not to #GP kvm
754 * guests on older kvm hosts.
756 msr_clear_bit(MSR_AMD64_BU_CFG2, 24);
758 if (cpu_has_amd_erratum(c, amd_erratum_383))
759 set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH);
762 #define MSR_AMD64_DE_CFG 0xC0011029
764 static void init_amd_ln(struct cpuinfo_x86 *c)
767 * Apply erratum 665 fix unconditionally so machines without a BIOS
770 msr_set_bit(MSR_AMD64_DE_CFG, 31);
773 static void init_amd_bd(struct cpuinfo_x86 *c)
777 /* re-enable TopologyExtensions if switched off by BIOS */
778 if ((c->x86_model >= 0x10) && (c->x86_model <= 0x6f) &&
779 !cpu_has(c, X86_FEATURE_TOPOEXT)) {
781 if (msr_set_bit(0xc0011005, 54) > 0) {
782 rdmsrl(0xc0011005, value);
783 if (value & BIT_64(54)) {
784 set_cpu_cap(c, X86_FEATURE_TOPOEXT);
785 pr_info_once(FW_INFO "CPU: Re-enabling disabled Topology Extensions Support.\n");
791 * The way access filter has a performance penalty on some workloads.
792 * Disable it on the affected CPUs.
794 if ((c->x86_model >= 0x02) && (c->x86_model < 0x20)) {
795 if (!rdmsrl_safe(MSR_F15H_IC_CFG, &value) && !(value & 0x1E)) {
797 wrmsrl_safe(MSR_F15H_IC_CFG, value);
802 static void init_amd_zn(struct cpuinfo_x86 *c)
804 set_cpu_cap(c, X86_FEATURE_ZEN);
806 * Fix erratum 1076: CPB feature bit not being set in CPUID. It affects
807 * all up to and including B1.
809 if (c->x86_model <= 1 && c->x86_stepping <= 1)
810 set_cpu_cap(c, X86_FEATURE_CPB);
813 static void init_amd(struct cpuinfo_x86 *c)
818 * Bit 31 in normal CPUID used for nonstandard 3DNow ID;
819 * 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway
821 clear_cpu_cap(c, 0*32+31);
824 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
826 /* get apicid instead of initial apic id from cpuid */
827 c->apicid = hard_smp_processor_id();
829 /* K6s reports MCEs but don't actually have all the MSRs */
831 clear_cpu_cap(c, X86_FEATURE_MCE);
834 case 4: init_amd_k5(c); break;
835 case 5: init_amd_k6(c); break;
836 case 6: init_amd_k7(c); break;
837 case 0xf: init_amd_k8(c); break;
838 case 0x10: init_amd_gh(c); break;
839 case 0x12: init_amd_ln(c); break;
840 case 0x15: init_amd_bd(c); break;
841 case 0x17: init_amd_zn(c); break;
845 * Enable workaround for FXSAVE leak on CPUs
846 * without a XSaveErPtr feature
848 if ((c->x86 >= 6) && (!cpu_has(c, X86_FEATURE_XSAVEERPTR)))
849 set_cpu_bug(c, X86_BUG_FXSAVE_LEAK);
851 cpu_detect_cache_sizes(c);
853 /* Multi core CPU? */
854 if (c->extended_cpuid_level >= 0x80000008) {
864 init_amd_cacheinfo(c);
867 set_cpu_cap(c, X86_FEATURE_K8);
869 if (cpu_has(c, X86_FEATURE_XMM2)) {
870 unsigned long long val;
874 * A serializing LFENCE has less overhead than MFENCE, so
875 * use it for execution serialization. On families which
876 * don't have that MSR, LFENCE is already serializing.
877 * msr_set_bit() uses the safe accessors, too, even if the MSR
880 msr_set_bit(MSR_F10H_DECFG,
881 MSR_F10H_DECFG_LFENCE_SERIALIZE_BIT);
884 * Verify that the MSR write was successful (could be running
885 * under a hypervisor) and only then assume that LFENCE is
888 ret = rdmsrl_safe(MSR_F10H_DECFG, &val);
889 if (!ret && (val & MSR_F10H_DECFG_LFENCE_SERIALIZE)) {
890 /* A serializing LFENCE stops RDTSC speculation */
891 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
893 /* MFENCE stops RDTSC speculation */
894 set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);
899 * Family 0x12 and above processors have APIC timer
900 * running in deep C states.
903 set_cpu_cap(c, X86_FEATURE_ARAT);
905 /* 3DNow or LM implies PREFETCHW */
906 if (!cpu_has(c, X86_FEATURE_3DNOWPREFETCH))
907 if (cpu_has(c, X86_FEATURE_3DNOW) || cpu_has(c, X86_FEATURE_LM))
908 set_cpu_cap(c, X86_FEATURE_3DNOWPREFETCH);
910 /* AMD CPUs don't reset SS attributes on SYSRET, Xen does. */
911 if (!cpu_has(c, X86_FEATURE_XENPV))
912 set_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
916 static unsigned int amd_size_cache(struct cpuinfo_x86 *c, unsigned int size)
918 /* AMD errata T13 (order #21922) */
921 if (c->x86_model == 3 && c->x86_stepping == 0)
923 /* Tbird rev A1/A2 */
924 if (c->x86_model == 4 &&
925 (c->x86_stepping == 0 || c->x86_stepping == 1))
932 static void cpu_detect_tlb_amd(struct cpuinfo_x86 *c)
934 u32 ebx, eax, ecx, edx;
940 if (c->extended_cpuid_level < 0x80000006)
943 cpuid(0x80000006, &eax, &ebx, &ecx, &edx);
945 tlb_lld_4k[ENTRIES] = (ebx >> 16) & mask;
946 tlb_lli_4k[ENTRIES] = ebx & mask;
949 * K8 doesn't have 2M/4M entries in the L2 TLB so read out the L1 TLB
950 * characteristics from the CPUID function 0x80000005 instead.
953 cpuid(0x80000005, &eax, &ebx, &ecx, &edx);
957 /* Handle DTLB 2M and 4M sizes, fall back to L1 if L2 is disabled */
958 if (!((eax >> 16) & mask))
959 tlb_lld_2m[ENTRIES] = (cpuid_eax(0x80000005) >> 16) & 0xff;
961 tlb_lld_2m[ENTRIES] = (eax >> 16) & mask;
963 /* a 4M entry uses two 2M entries */
964 tlb_lld_4m[ENTRIES] = tlb_lld_2m[ENTRIES] >> 1;
966 /* Handle ITLB 2M and 4M sizes, fall back to L1 if L2 is disabled */
969 if (c->x86 == 0x15 && c->x86_model <= 0x1f) {
970 tlb_lli_2m[ENTRIES] = 1024;
972 cpuid(0x80000005, &eax, &ebx, &ecx, &edx);
973 tlb_lli_2m[ENTRIES] = eax & 0xff;
976 tlb_lli_2m[ENTRIES] = eax & mask;
978 tlb_lli_4m[ENTRIES] = tlb_lli_2m[ENTRIES] >> 1;
981 static const struct cpu_dev amd_cpu_dev = {
983 .c_ident = { "AuthenticAMD" },
986 { .family = 4, .model_names =
997 .legacy_cache_size = amd_size_cache,
999 .c_early_init = early_init_amd,
1000 .c_detect_tlb = cpu_detect_tlb_amd,
1001 .c_bsp_init = bsp_init_amd,
1003 .c_x86_vendor = X86_VENDOR_AMD,
1006 cpu_dev_register(amd_cpu_dev);
1009 * AMD errata checking
1011 * Errata are defined as arrays of ints using the AMD_LEGACY_ERRATUM() or
1012 * AMD_OSVW_ERRATUM() macros. The latter is intended for newer errata that
1013 * have an OSVW id assigned, which it takes as first argument. Both take a
1014 * variable number of family-specific model-stepping ranges created by
1015 * AMD_MODEL_RANGE().
1019 * const int amd_erratum_319[] =
1020 * AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0x4, 0x2),
1021 * AMD_MODEL_RANGE(0x10, 0x8, 0x0, 0x8, 0x0),
1022 * AMD_MODEL_RANGE(0x10, 0x9, 0x0, 0x9, 0x0));
1025 #define AMD_LEGACY_ERRATUM(...) { -1, __VA_ARGS__, 0 }
1026 #define AMD_OSVW_ERRATUM(osvw_id, ...) { osvw_id, __VA_ARGS__, 0 }
1027 #define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \
1028 ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end))
1029 #define AMD_MODEL_RANGE_FAMILY(range) (((range) >> 24) & 0xff)
1030 #define AMD_MODEL_RANGE_START(range) (((range) >> 12) & 0xfff)
1031 #define AMD_MODEL_RANGE_END(range) ((range) & 0xfff)
1033 static const int amd_erratum_400[] =
1034 AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
1035 AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
1037 static const int amd_erratum_383[] =
1038 AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0, 0, 0xff, 0xf));
1041 static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)
1043 int osvw_id = *erratum++;
1047 if (osvw_id >= 0 && osvw_id < 65536 &&
1048 cpu_has(cpu, X86_FEATURE_OSVW)) {
1051 rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, osvw_len);
1052 if (osvw_id < osvw_len) {
1055 rdmsrl(MSR_AMD64_OSVW_STATUS + (osvw_id >> 6),
1057 return osvw_bits & (1ULL << (osvw_id & 0x3f));
1061 /* OSVW unavailable or ID unknown, match family-model-stepping range */
1062 ms = (cpu->x86_model << 4) | cpu->x86_stepping;
1063 while ((range = *erratum++))
1064 if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) &&
1065 (ms >= AMD_MODEL_RANGE_START(range)) &&
1066 (ms <= AMD_MODEL_RANGE_END(range)))
1072 void set_dr_addr_mask(unsigned long mask, int dr)
1074 if (!boot_cpu_has(X86_FEATURE_BPEXT))
1079 wrmsr(MSR_F16H_DR0_ADDR_MASK, mask, 0);
1084 wrmsr(MSR_F16H_DR1_ADDR_MASK - 1 + dr, mask, 0);