1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/export.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 <linux/sched/clock.h>
10 #include <linux/random.h>
11 #include <linux/topology.h>
12 #include <linux/platform_data/x86/amd-fch.h>
13 #include <asm/processor.h>
14 #include <asm/apic.h>
15 #include <asm/cacheinfo.h>
16 #include <asm/cpu.h>
17 #include <asm/cpu_device_id.h>
18 #include <asm/spec-ctrl.h>
19 #include <asm/smp.h>
20 #include <asm/numa.h>
21 #include <asm/pci-direct.h>
22 #include <asm/delay.h>
23 #include <asm/debugreg.h>
24 #include <asm/resctrl.h>
25 #include <asm/msr.h>
26 #include <asm/sev.h>
27
28 #ifdef CONFIG_X86_64
29 # include <asm/mmconfig.h>
30 #endif
31
32 #include "cpu.h"
33
34 u16 invlpgb_count_max __ro_after_init = 1;
35
rdmsrq_amd_safe(unsigned msr,u64 * p)36 static inline int rdmsrq_amd_safe(unsigned msr, u64 *p)
37 {
38 u32 gprs[8] = { 0 };
39 int err;
40
41 WARN_ONCE((boot_cpu_data.x86 != 0xf),
42 "%s should only be used on K8!\n", __func__);
43
44 gprs[1] = msr;
45 gprs[7] = 0x9c5a203a;
46
47 err = rdmsr_safe_regs(gprs);
48
49 *p = gprs[0] | ((u64)gprs[2] << 32);
50
51 return err;
52 }
53
wrmsrq_amd_safe(unsigned msr,u64 val)54 static inline int wrmsrq_amd_safe(unsigned msr, u64 val)
55 {
56 u32 gprs[8] = { 0 };
57
58 WARN_ONCE((boot_cpu_data.x86 != 0xf),
59 "%s should only be used on K8!\n", __func__);
60
61 gprs[0] = (u32)val;
62 gprs[1] = msr;
63 gprs[2] = val >> 32;
64 gprs[7] = 0x9c5a203a;
65
66 return wrmsr_safe_regs(gprs);
67 }
68
69 /*
70 * B step AMD K6 before B 9730xxxx have hardware bugs that can cause
71 * misexecution of code under Linux. Owners of such processors should
72 * contact AMD for precise details and a CPU swap.
73 *
74 * See http://www.multimania.com/poulot/k6bug.html
75 * and section 2.6.2 of "AMD-K6 Processor Revision Guide - Model 6"
76 * (Publication # 21266 Issue Date: August 1998)
77 *
78 * The following test is erm.. interesting. AMD neglected to up
79 * the chip setting when fixing the bug but they also tweaked some
80 * performance at the same time..
81 */
82
83 #ifdef CONFIG_X86_32
84 extern __visible void vide(void);
85 __asm__(".text\n"
86 ".globl vide\n"
87 ".type vide, @function\n"
88 ".align 4\n"
89 "vide: ret\n");
90 #endif
91
init_amd_k5(struct cpuinfo_x86 * c)92 static void init_amd_k5(struct cpuinfo_x86 *c)
93 {
94 #ifdef CONFIG_X86_32
95 /*
96 * General Systems BIOSen alias the cpu frequency registers
97 * of the Elan at 0x000df000. Unfortunately, one of the Linux
98 * drivers subsequently pokes it, and changes the CPU speed.
99 * Workaround : Remove the unneeded alias.
100 */
101 #define CBAR (0xfffc) /* Configuration Base Address (32-bit) */
102 #define CBAR_ENB (0x80000000)
103 #define CBAR_KEY (0X000000CB)
104 if (c->x86_model == 9 || c->x86_model == 10) {
105 if (inl(CBAR) & CBAR_ENB)
106 outl(0 | CBAR_KEY, CBAR);
107 }
108 #endif
109 }
110
init_amd_k6(struct cpuinfo_x86 * c)111 static void init_amd_k6(struct cpuinfo_x86 *c)
112 {
113 #ifdef CONFIG_X86_32
114 u32 l, h;
115 int mbytes = get_num_physpages() >> (20-PAGE_SHIFT);
116
117 if (c->x86_model < 6) {
118 /* Based on AMD doc 20734R - June 2000 */
119 if (c->x86_model == 0) {
120 clear_cpu_cap(c, X86_FEATURE_APIC);
121 set_cpu_cap(c, X86_FEATURE_PGE);
122 }
123 return;
124 }
125
126 if (c->x86_model == 6 && c->x86_stepping == 1) {
127 const int K6_BUG_LOOP = 1000000;
128 int n;
129 void (*f_vide)(void);
130 u64 d, d2;
131
132 pr_info("AMD K6 stepping B detected - ");
133
134 /*
135 * It looks like AMD fixed the 2.6.2 bug and improved indirect
136 * calls at the same time.
137 */
138
139 n = K6_BUG_LOOP;
140 f_vide = vide;
141 OPTIMIZER_HIDE_VAR(f_vide);
142 d = rdtsc();
143 while (n--)
144 f_vide();
145 d2 = rdtsc();
146 d = d2-d;
147
148 if (d > 20*K6_BUG_LOOP)
149 pr_cont("system stability may be impaired when more than 32 MB are used.\n");
150 else
151 pr_cont("probably OK (after B9730xxxx).\n");
152 }
153
154 /* K6 with old style WHCR */
155 if (c->x86_model < 8 ||
156 (c->x86_model == 8 && c->x86_stepping < 8)) {
157 /* We can only write allocate on the low 508Mb */
158 if (mbytes > 508)
159 mbytes = 508;
160
161 rdmsr(MSR_K6_WHCR, l, h);
162 if ((l&0x0000FFFF) == 0) {
163 unsigned long flags;
164 l = (1<<0)|((mbytes/4)<<1);
165 local_irq_save(flags);
166 wbinvd();
167 wrmsr(MSR_K6_WHCR, l, h);
168 local_irq_restore(flags);
169 pr_info("Enabling old style K6 write allocation for %d Mb\n",
170 mbytes);
171 }
172 return;
173 }
174
175 if ((c->x86_model == 8 && c->x86_stepping > 7) ||
176 c->x86_model == 9 || c->x86_model == 13) {
177 /* The more serious chips .. */
178
179 if (mbytes > 4092)
180 mbytes = 4092;
181
182 rdmsr(MSR_K6_WHCR, l, h);
183 if ((l&0xFFFF0000) == 0) {
184 unsigned long flags;
185 l = ((mbytes>>2)<<22)|(1<<16);
186 local_irq_save(flags);
187 wbinvd();
188 wrmsr(MSR_K6_WHCR, l, h);
189 local_irq_restore(flags);
190 pr_info("Enabling new style K6 write allocation for %d Mb\n",
191 mbytes);
192 }
193
194 return;
195 }
196
197 if (c->x86_model == 10) {
198 /* AMD Geode LX is model 10 */
199 /* placeholder for any needed mods */
200 return;
201 }
202 #endif
203 }
204
init_amd_k7(struct cpuinfo_x86 * c)205 static void init_amd_k7(struct cpuinfo_x86 *c)
206 {
207 #ifdef CONFIG_X86_32
208 u32 l, h;
209
210 /*
211 * Bit 15 of Athlon specific MSR 15, needs to be 0
212 * to enable SSE on Palomino/Morgan/Barton CPU's.
213 * If the BIOS didn't enable it already, enable it here.
214 */
215 if (c->x86_model >= 6 && c->x86_model <= 10) {
216 if (!cpu_has(c, X86_FEATURE_XMM)) {
217 pr_info("Enabling disabled K7/SSE Support.\n");
218 msr_clear_bit(MSR_K7_HWCR, 15);
219 set_cpu_cap(c, X86_FEATURE_XMM);
220 }
221 }
222
223 /*
224 * It's been determined by AMD that Athlons since model 8 stepping 1
225 * are more robust with CLK_CTL set to 200xxxxx instead of 600xxxxx
226 * As per AMD technical note 27212 0.2
227 */
228 if ((c->x86_model == 8 && c->x86_stepping >= 1) || (c->x86_model > 8)) {
229 rdmsr(MSR_K7_CLK_CTL, l, h);
230 if ((l & 0xfff00000) != 0x20000000) {
231 pr_info("CPU: CLK_CTL MSR was %x. Reprogramming to %x\n",
232 l, ((l & 0x000fffff)|0x20000000));
233 wrmsr(MSR_K7_CLK_CTL, (l & 0x000fffff)|0x20000000, h);
234 }
235 }
236
237 /* calling is from identify_secondary_cpu() ? */
238 if (!c->cpu_index)
239 return;
240
241 /*
242 * Certain Athlons might work (for various values of 'work') in SMP
243 * but they are not certified as MP capable.
244 */
245 /* Athlon 660/661 is valid. */
246 if ((c->x86_model == 6) && ((c->x86_stepping == 0) ||
247 (c->x86_stepping == 1)))
248 return;
249
250 /* Duron 670 is valid */
251 if ((c->x86_model == 7) && (c->x86_stepping == 0))
252 return;
253
254 /*
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
259 * more.
260 */
261 if (((c->x86_model == 6) && (c->x86_stepping >= 2)) ||
262 ((c->x86_model == 7) && (c->x86_stepping >= 1)) ||
263 (c->x86_model > 7))
264 if (cpu_has(c, X86_FEATURE_MP))
265 return;
266
267 /* If we get here, not a certified SMP capable AMD system. */
268
269 /*
270 * Don't taint if we are running SMP kernel on a single non-MP
271 * approved Athlon
272 */
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);
276 #endif
277 }
278
279 #ifdef CONFIG_NUMA
280 /*
281 * To workaround broken NUMA config. Read the comment in
282 * srat_detect_node().
283 */
nearby_node(int apicid)284 static int nearby_node(int apicid)
285 {
286 int i, node;
287
288 for (i = apicid - 1; i >= 0; i--) {
289 node = __apicid_to_node[i];
290 if (node != NUMA_NO_NODE && node_online(node))
291 return node;
292 }
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))
296 return node;
297 }
298 return first_node(node_online_map); /* Shouldn't happen */
299 }
300 #endif
301
srat_detect_node(struct cpuinfo_x86 * c)302 static void srat_detect_node(struct cpuinfo_x86 *c)
303 {
304 #ifdef CONFIG_NUMA
305 int cpu = smp_processor_id();
306 int node;
307 unsigned apicid = c->topo.apicid;
308
309 node = numa_cpu_node(cpu);
310 if (node == NUMA_NO_NODE)
311 node = per_cpu_llc_id(cpu);
312
313 /*
314 * On multi-fabric platform (e.g. Numascale NumaChip) a
315 * platform-specific handler needs to be called to fixup some
316 * IDs of the CPU.
317 */
318 if (x86_cpuinit.fixup_cpu_id)
319 x86_cpuinit.fixup_cpu_id(c, node);
320
321 if (!node_online(node)) {
322 /*
323 * Two possibilities here:
324 *
325 * - The CPU is missing memory and no node was created. In
326 * that case try picking one from a nearby CPU.
327 *
328 * - The APIC IDs differ from the HyperTransport node IDs
329 * which the K8 northbridge parsing fills in. Assume
330 * they are all increased by a constant offset, but in
331 * the same order as the HT nodeids. If that doesn't
332 * result in a usable node fall back to the path for the
333 * previous case.
334 *
335 * This workaround operates directly on the mapping between
336 * APIC ID and NUMA node, assuming certain relationship
337 * between APIC ID, HT node ID and NUMA topology. As going
338 * through CPU mapping may alter the outcome, directly
339 * access __apicid_to_node[].
340 */
341 int ht_nodeid = c->topo.initial_apicid;
342
343 if (__apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
344 node = __apicid_to_node[ht_nodeid];
345 /* Pick a nearby node */
346 if (!node_online(node))
347 node = nearby_node(apicid);
348 }
349 numa_set_node(cpu, node);
350 #endif
351 }
352
bsp_determine_snp(struct cpuinfo_x86 * c)353 static void bsp_determine_snp(struct cpuinfo_x86 *c)
354 {
355 #ifdef CONFIG_ARCH_HAS_CC_PLATFORM
356 cc_vendor = CC_VENDOR_AMD;
357
358 if (cpu_has(c, X86_FEATURE_SEV_SNP)) {
359 /*
360 * RMP table entry format is not architectural and is defined by the
361 * per-processor PPR. Restrict SNP support on the known CPU models
362 * for which the RMP table entry format is currently defined or for
363 * processors which support the architecturally defined RMPREAD
364 * instruction.
365 */
366 if (!cpu_has(c, X86_FEATURE_HYPERVISOR) &&
367 (cpu_feature_enabled(X86_FEATURE_ZEN3) ||
368 cpu_feature_enabled(X86_FEATURE_ZEN4) ||
369 cpu_feature_enabled(X86_FEATURE_RMPREAD)) &&
370 snp_probe_rmptable_info()) {
371 cc_platform_set(CC_ATTR_HOST_SEV_SNP);
372 } else {
373 setup_clear_cpu_cap(X86_FEATURE_SEV_SNP);
374 cc_platform_clear(CC_ATTR_HOST_SEV_SNP);
375 }
376 }
377 #endif
378 }
379
380 #define ZEN_MODEL_STEP_UCODE(fam, model, step, ucode) \
381 X86_MATCH_VFM_STEPS(VFM_MAKE(X86_VENDOR_AMD, fam, model), \
382 step, step, ucode)
383
384 static const struct x86_cpu_id amd_tsa_microcode[] = {
385 ZEN_MODEL_STEP_UCODE(0x19, 0x01, 0x1, 0x0a0011d7),
386 ZEN_MODEL_STEP_UCODE(0x19, 0x01, 0x2, 0x0a00123b),
387 ZEN_MODEL_STEP_UCODE(0x19, 0x08, 0x2, 0x0a00820d),
388 ZEN_MODEL_STEP_UCODE(0x19, 0x11, 0x1, 0x0a10114c),
389 ZEN_MODEL_STEP_UCODE(0x19, 0x11, 0x2, 0x0a10124c),
390 ZEN_MODEL_STEP_UCODE(0x19, 0x18, 0x1, 0x0a108109),
391 ZEN_MODEL_STEP_UCODE(0x19, 0x21, 0x0, 0x0a20102e),
392 ZEN_MODEL_STEP_UCODE(0x19, 0x21, 0x2, 0x0a201211),
393 ZEN_MODEL_STEP_UCODE(0x19, 0x44, 0x1, 0x0a404108),
394 ZEN_MODEL_STEP_UCODE(0x19, 0x50, 0x0, 0x0a500012),
395 ZEN_MODEL_STEP_UCODE(0x19, 0x61, 0x2, 0x0a60120a),
396 ZEN_MODEL_STEP_UCODE(0x19, 0x74, 0x1, 0x0a704108),
397 ZEN_MODEL_STEP_UCODE(0x19, 0x75, 0x2, 0x0a705208),
398 ZEN_MODEL_STEP_UCODE(0x19, 0x78, 0x0, 0x0a708008),
399 ZEN_MODEL_STEP_UCODE(0x19, 0x7c, 0x0, 0x0a70c008),
400 ZEN_MODEL_STEP_UCODE(0x19, 0xa0, 0x2, 0x0aa00216),
401 {},
402 };
403
tsa_init(struct cpuinfo_x86 * c)404 static void tsa_init(struct cpuinfo_x86 *c)
405 {
406 if (cpu_has(c, X86_FEATURE_HYPERVISOR))
407 return;
408
409 if (cpu_has(c, X86_FEATURE_ZEN3) ||
410 cpu_has(c, X86_FEATURE_ZEN4)) {
411 if (x86_match_min_microcode_rev(amd_tsa_microcode))
412 setup_force_cpu_cap(X86_FEATURE_VERW_CLEAR);
413 else
414 pr_debug("%s: current revision: 0x%x\n", __func__, c->microcode);
415 } else {
416 setup_force_cpu_cap(X86_FEATURE_TSA_SQ_NO);
417 setup_force_cpu_cap(X86_FEATURE_TSA_L1_NO);
418 }
419 }
420
bsp_init_amd(struct cpuinfo_x86 * c)421 static void bsp_init_amd(struct cpuinfo_x86 *c)
422 {
423 if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) {
424
425 if (c->x86 > 0x10 ||
426 (c->x86 == 0x10 && c->x86_model >= 0x2)) {
427 u64 val;
428
429 rdmsrq(MSR_K7_HWCR, val);
430 if (!(val & BIT(24)))
431 pr_warn(FW_BUG "TSC doesn't count with P0 frequency!\n");
432 }
433 }
434
435 if (c->x86 == 0x15) {
436 unsigned long upperbit;
437 u32 cpuid, assoc;
438
439 cpuid = cpuid_edx(0x80000005);
440 assoc = cpuid >> 16 & 0xff;
441 upperbit = ((cpuid >> 24) << 10) / assoc;
442
443 va_align.mask = (upperbit - 1) & PAGE_MASK;
444 va_align.flags = ALIGN_VA_32 | ALIGN_VA_64;
445
446 /* A random value per boot for bit slice [12:upper_bit) */
447 va_align.bits = get_random_u32() & va_align.mask;
448 }
449
450 if (cpu_has(c, X86_FEATURE_MWAITX))
451 use_mwaitx_delay();
452
453 if (!boot_cpu_has(X86_FEATURE_AMD_SSBD) &&
454 !boot_cpu_has(X86_FEATURE_VIRT_SSBD) &&
455 c->x86 >= 0x15 && c->x86 <= 0x17) {
456 unsigned int bit;
457
458 switch (c->x86) {
459 case 0x15: bit = 54; break;
460 case 0x16: bit = 33; break;
461 case 0x17: bit = 10; break;
462 default: return;
463 }
464 /*
465 * Try to cache the base value so further operations can
466 * avoid RMW. If that faults, do not enable SSBD.
467 */
468 if (!rdmsrq_safe(MSR_AMD64_LS_CFG, &x86_amd_ls_cfg_base)) {
469 setup_force_cpu_cap(X86_FEATURE_LS_CFG_SSBD);
470 setup_force_cpu_cap(X86_FEATURE_SSBD);
471 x86_amd_ls_cfg_ssbd_mask = 1ULL << bit;
472 }
473 }
474
475 resctrl_cpu_detect(c);
476
477 /* Figure out Zen generations: */
478 switch (c->x86) {
479 case 0x17:
480 switch (c->x86_model) {
481 case 0x00 ... 0x2f:
482 case 0x50 ... 0x5f:
483 setup_force_cpu_cap(X86_FEATURE_ZEN1);
484 break;
485 case 0x30 ... 0x4f:
486 case 0x60 ... 0x7f:
487 case 0x90 ... 0x91:
488 case 0xa0 ... 0xaf:
489 setup_force_cpu_cap(X86_FEATURE_ZEN2);
490 break;
491 default:
492 goto warn;
493 }
494 break;
495
496 case 0x19:
497 switch (c->x86_model) {
498 case 0x00 ... 0x0f:
499 case 0x20 ... 0x5f:
500 setup_force_cpu_cap(X86_FEATURE_ZEN3);
501 break;
502 case 0x10 ... 0x1f:
503 case 0x60 ... 0xaf:
504 setup_force_cpu_cap(X86_FEATURE_ZEN4);
505 break;
506 default:
507 goto warn;
508 }
509 break;
510
511 case 0x1a:
512 switch (c->x86_model) {
513 case 0x00 ... 0x2f:
514 case 0x40 ... 0x4f:
515 case 0x60 ... 0x7f:
516 setup_force_cpu_cap(X86_FEATURE_ZEN5);
517 break;
518 case 0x50 ... 0x5f:
519 case 0x90 ... 0xaf:
520 case 0xc0 ... 0xcf:
521 setup_force_cpu_cap(X86_FEATURE_ZEN6);
522 break;
523 default:
524 goto warn;
525 }
526 break;
527
528 default:
529 break;
530 }
531
532 bsp_determine_snp(c);
533 tsa_init(c);
534
535 if (cpu_has(c, X86_FEATURE_GP_ON_USER_CPUID))
536 setup_force_cpu_cap(X86_FEATURE_CPUID_FAULT);
537
538 return;
539
540 warn:
541 WARN_ONCE(1, "Family 0x%x, model: 0x%x??\n", c->x86, c->x86_model);
542 }
543
early_detect_mem_encrypt(struct cpuinfo_x86 * c)544 static void early_detect_mem_encrypt(struct cpuinfo_x86 *c)
545 {
546 u64 msr;
547
548 /*
549 * BIOS support is required for SME and SEV.
550 * For SME: If BIOS has enabled SME then adjust x86_phys_bits by
551 * the SME physical address space reduction value.
552 * If BIOS has not enabled SME then don't advertise the
553 * SME feature (set in scattered.c).
554 * If the kernel has not enabled SME via any means then
555 * don't advertise the SME feature.
556 * For SEV: If BIOS has not enabled SEV then don't advertise SEV and
557 * any additional functionality based on it.
558 *
559 * In all cases, since support for SME and SEV requires long mode,
560 * don't advertise the feature under CONFIG_X86_32.
561 */
562 if (cpu_has(c, X86_FEATURE_SME) || cpu_has(c, X86_FEATURE_SEV)) {
563 /* Check if memory encryption is enabled */
564 rdmsrq(MSR_AMD64_SYSCFG, msr);
565 if (!(msr & MSR_AMD64_SYSCFG_MEM_ENCRYPT))
566 goto clear_all;
567
568 /*
569 * Always adjust physical address bits. Even though this
570 * will be a value above 32-bits this is still done for
571 * CONFIG_X86_32 so that accurate values are reported.
572 */
573 c->x86_phys_bits -= (cpuid_ebx(0x8000001f) >> 6) & 0x3f;
574
575 if (IS_ENABLED(CONFIG_X86_32))
576 goto clear_all;
577
578 if (!sme_me_mask)
579 setup_clear_cpu_cap(X86_FEATURE_SME);
580
581 rdmsrq(MSR_K7_HWCR, msr);
582 if (!(msr & MSR_K7_HWCR_SMMLOCK))
583 goto clear_sev;
584
585 return;
586
587 clear_all:
588 setup_clear_cpu_cap(X86_FEATURE_SME);
589 clear_sev:
590 setup_clear_cpu_cap(X86_FEATURE_SEV);
591 setup_clear_cpu_cap(X86_FEATURE_SEV_ES);
592 setup_clear_cpu_cap(X86_FEATURE_SEV_SNP);
593 }
594 }
595
early_init_amd(struct cpuinfo_x86 * c)596 static void early_init_amd(struct cpuinfo_x86 *c)
597 {
598 u32 dummy;
599
600 if (c->x86 >= 0xf)
601 set_cpu_cap(c, X86_FEATURE_K8);
602
603 rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);
604
605 /*
606 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
607 * with P/T states and does not stop in deep C-states
608 */
609 if (c->x86_power & (1 << 8)) {
610 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
611 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
612 }
613
614 /* Bit 12 of 8000_0007 edx is accumulated power mechanism. */
615 if (c->x86_power & BIT(12))
616 set_cpu_cap(c, X86_FEATURE_ACC_POWER);
617
618 /* Bit 14 indicates the Runtime Average Power Limit interface. */
619 if (c->x86_power & BIT(14))
620 set_cpu_cap(c, X86_FEATURE_RAPL);
621
622 #ifdef CONFIG_X86_64
623 set_cpu_cap(c, X86_FEATURE_SYSCALL32);
624 #else
625 /* Set MTRR capability flag if appropriate */
626 if (c->x86 == 5)
627 if (c->x86_model == 13 || c->x86_model == 9 ||
628 (c->x86_model == 8 && c->x86_stepping >= 8))
629 set_cpu_cap(c, X86_FEATURE_K6_MTRR);
630 #endif
631 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_PCI)
632 /*
633 * ApicID can always be treated as an 8-bit value for AMD APIC versions
634 * >= 0x10, but even old K8s came out of reset with version 0x10. So, we
635 * can safely set X86_FEATURE_EXTD_APICID unconditionally for families
636 * after 16h.
637 */
638 if (boot_cpu_has(X86_FEATURE_APIC)) {
639 if (c->x86 > 0x16)
640 set_cpu_cap(c, X86_FEATURE_EXTD_APICID);
641 else if (c->x86 >= 0xf) {
642 /* check CPU config space for extended APIC ID */
643 unsigned int val;
644
645 val = read_pci_config(0, 24, 0, 0x68);
646 if ((val >> 17 & 0x3) == 0x3)
647 set_cpu_cap(c, X86_FEATURE_EXTD_APICID);
648 }
649 }
650 #endif
651
652 /*
653 * This is only needed to tell the kernel whether to use VMCALL
654 * and VMMCALL. VMMCALL is never executed except under virt, so
655 * we can set it unconditionally.
656 */
657 set_cpu_cap(c, X86_FEATURE_VMMCALL);
658
659 /* F16h erratum 793, CVE-2013-6885 */
660 if (c->x86 == 0x16 && c->x86_model <= 0xf)
661 msr_set_bit(MSR_AMD64_LS_CFG, 15);
662
663 early_detect_mem_encrypt(c);
664
665 if (!cpu_has(c, X86_FEATURE_HYPERVISOR) && !cpu_has(c, X86_FEATURE_IBPB_BRTYPE)) {
666 if (c->x86 == 0x17 && boot_cpu_has(X86_FEATURE_AMD_IBPB))
667 setup_force_cpu_cap(X86_FEATURE_IBPB_BRTYPE);
668 else if (c->x86 >= 0x19 && !wrmsrq_safe(MSR_IA32_PRED_CMD, PRED_CMD_SBPB)) {
669 setup_force_cpu_cap(X86_FEATURE_IBPB_BRTYPE);
670 setup_force_cpu_cap(X86_FEATURE_SBPB);
671 }
672 }
673 }
674
init_amd_k8(struct cpuinfo_x86 * c)675 static void init_amd_k8(struct cpuinfo_x86 *c)
676 {
677 u32 level;
678 u64 value;
679
680 /* On C+ stepping K8 rep microcode works well for copy/memset */
681 level = cpuid_eax(1);
682 if ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58)
683 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
684
685 /*
686 * Some BIOSes incorrectly force this feature, but only K8 revision D
687 * (model = 0x14) and later actually support it.
688 * (AMD Erratum #110, docId: 25759).
689 */
690 if (c->x86_model < 0x14 && cpu_has(c, X86_FEATURE_LAHF_LM) && !cpu_has(c, X86_FEATURE_HYPERVISOR)) {
691 clear_cpu_cap(c, X86_FEATURE_LAHF_LM);
692 if (!rdmsrq_amd_safe(0xc001100d, &value)) {
693 value &= ~BIT_64(32);
694 wrmsrq_amd_safe(0xc001100d, value);
695 }
696 }
697
698 if (!c->x86_model_id[0])
699 strscpy(c->x86_model_id, "Hammer");
700
701 #ifdef CONFIG_SMP
702 /*
703 * Disable TLB flush filter by setting HWCR.FFDIS on K8
704 * bit 6 of msr C001_0015
705 *
706 * Errata 63 for SH-B3 steppings
707 * Errata 122 for all steppings (F+ have it disabled by default)
708 */
709 msr_set_bit(MSR_K7_HWCR, 6);
710 #endif
711 set_cpu_bug(c, X86_BUG_SWAPGS_FENCE);
712
713 /*
714 * Check models and steppings affected by erratum 400. This is
715 * used to select the proper idle routine and to enable the
716 * check whether the machine is affected in arch_post_acpi_subsys_init()
717 * which sets the X86_BUG_AMD_APIC_C1E bug depending on the MSR check.
718 */
719 if (c->x86_model > 0x41 ||
720 (c->x86_model == 0x41 && c->x86_stepping >= 0x2))
721 setup_force_cpu_bug(X86_BUG_AMD_E400);
722 }
723
init_amd_gh(struct cpuinfo_x86 * c)724 static void init_amd_gh(struct cpuinfo_x86 *c)
725 {
726 #ifdef CONFIG_MMCONF_FAM10H
727 /* do this for boot cpu */
728 if (c == &boot_cpu_data)
729 check_enable_amd_mmconf_dmi();
730
731 fam10h_check_enable_mmcfg();
732 #endif
733
734 /*
735 * Disable GART TLB Walk Errors on Fam10h. We do this here because this
736 * is always needed when GART is enabled, even in a kernel which has no
737 * MCE support built in. BIOS should disable GartTlbWlk Errors already.
738 * If it doesn't, we do it here as suggested by the BKDG.
739 *
740 * Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=33012
741 */
742 msr_set_bit(MSR_AMD64_MCx_MASK(4), 10);
743
744 /*
745 * On family 10h BIOS may not have properly enabled WC+ support, causing
746 * it to be converted to CD memtype. This may result in performance
747 * degradation for certain nested-paging guests. Prevent this conversion
748 * by clearing bit 24 in MSR_AMD64_BU_CFG2.
749 *
750 * NOTE: we want to use the _safe accessors so as not to #GP kvm
751 * guests on older kvm hosts.
752 */
753 msr_clear_bit(MSR_AMD64_BU_CFG2, 24);
754
755 set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH);
756
757 /*
758 * Check models and steppings affected by erratum 400. This is
759 * used to select the proper idle routine and to enable the
760 * check whether the machine is affected in arch_post_acpi_subsys_init()
761 * which sets the X86_BUG_AMD_APIC_C1E bug depending on the MSR check.
762 */
763 if (c->x86_model > 0x2 ||
764 (c->x86_model == 0x2 && c->x86_stepping >= 0x1))
765 setup_force_cpu_bug(X86_BUG_AMD_E400);
766 }
767
init_amd_ln(struct cpuinfo_x86 * c)768 static void init_amd_ln(struct cpuinfo_x86 *c)
769 {
770 /*
771 * Apply erratum 665 fix unconditionally so machines without a BIOS
772 * fix work.
773 */
774 msr_set_bit(MSR_AMD64_DE_CFG, 31);
775 }
776
777 static bool rdrand_force;
778
rdrand_cmdline(char * str)779 static int __init rdrand_cmdline(char *str)
780 {
781 if (!str)
782 return -EINVAL;
783
784 if (!strcmp(str, "force"))
785 rdrand_force = true;
786 else
787 return -EINVAL;
788
789 return 0;
790 }
791 early_param("rdrand", rdrand_cmdline);
792
clear_rdrand_cpuid_bit(struct cpuinfo_x86 * c)793 static void clear_rdrand_cpuid_bit(struct cpuinfo_x86 *c)
794 {
795 /*
796 * Saving of the MSR used to hide the RDRAND support during
797 * suspend/resume is done by arch/x86/power/cpu.c, which is
798 * dependent on CONFIG_PM_SLEEP.
799 */
800 if (!IS_ENABLED(CONFIG_PM_SLEEP))
801 return;
802
803 /*
804 * The self-test can clear X86_FEATURE_RDRAND, so check for
805 * RDRAND support using the CPUID function directly.
806 */
807 if (!(cpuid_ecx(1) & BIT(30)) || rdrand_force)
808 return;
809
810 msr_clear_bit(MSR_AMD64_CPUID_FN_1, 62);
811
812 /*
813 * Verify that the CPUID change has occurred in case the kernel is
814 * running virtualized and the hypervisor doesn't support the MSR.
815 */
816 if (cpuid_ecx(1) & BIT(30)) {
817 pr_info_once("BIOS may not properly restore RDRAND after suspend, but hypervisor does not support hiding RDRAND via CPUID.\n");
818 return;
819 }
820
821 clear_cpu_cap(c, X86_FEATURE_RDRAND);
822 pr_info_once("BIOS may not properly restore RDRAND after suspend, hiding RDRAND via CPUID. Use rdrand=force to reenable.\n");
823 }
824
init_amd_jg(struct cpuinfo_x86 * c)825 static void init_amd_jg(struct cpuinfo_x86 *c)
826 {
827 /*
828 * Some BIOS implementations do not restore proper RDRAND support
829 * across suspend and resume. Check on whether to hide the RDRAND
830 * instruction support via CPUID.
831 */
832 clear_rdrand_cpuid_bit(c);
833 }
834
init_amd_bd(struct cpuinfo_x86 * c)835 static void init_amd_bd(struct cpuinfo_x86 *c)
836 {
837 u64 value;
838
839 /*
840 * The way access filter has a performance penalty on some workloads.
841 * Disable it on the affected CPUs.
842 */
843 if ((c->x86_model >= 0x02) && (c->x86_model < 0x20)) {
844 if (!rdmsrq_safe(MSR_F15H_IC_CFG, &value) && !(value & 0x1E)) {
845 value |= 0x1E;
846 wrmsrq_safe(MSR_F15H_IC_CFG, value);
847 }
848 }
849
850 /*
851 * Some BIOS implementations do not restore proper RDRAND support
852 * across suspend and resume. Check on whether to hide the RDRAND
853 * instruction support via CPUID.
854 */
855 clear_rdrand_cpuid_bit(c);
856 }
857
858 static const struct x86_cpu_id erratum_1386_microcode[] = {
859 X86_MATCH_VFM_STEPS(VFM_MAKE(X86_VENDOR_AMD, 0x17, 0x01), 0x2, 0x2, 0x0800126e),
860 X86_MATCH_VFM_STEPS(VFM_MAKE(X86_VENDOR_AMD, 0x17, 0x31), 0x0, 0x0, 0x08301052),
861 {}
862 };
863
fix_erratum_1386(struct cpuinfo_x86 * c)864 static void fix_erratum_1386(struct cpuinfo_x86 *c)
865 {
866 /*
867 * Work around Erratum 1386. The XSAVES instruction malfunctions in
868 * certain circumstances on Zen1/2 uarch, and not all parts have had
869 * updated microcode at the time of writing (March 2023).
870 *
871 * Affected parts all have no supervisor XSAVE states, meaning that
872 * the XSAVEC instruction (which works fine) is equivalent.
873 *
874 * Clear the feature flag only on microcode revisions which
875 * don't have the fix.
876 */
877 if (x86_match_min_microcode_rev(erratum_1386_microcode))
878 return;
879
880 clear_cpu_cap(c, X86_FEATURE_XSAVES);
881 }
882
init_spectral_chicken(struct cpuinfo_x86 * c)883 void init_spectral_chicken(struct cpuinfo_x86 *c)
884 {
885 #ifdef CONFIG_MITIGATION_UNRET_ENTRY
886 u64 value;
887
888 /*
889 * On Zen2 we offer this chicken (bit) on the altar of Speculation.
890 *
891 * This suppresses speculation from the middle of a basic block, i.e. it
892 * suppresses non-branch predictions.
893 */
894 if (!cpu_has(c, X86_FEATURE_HYPERVISOR)) {
895 if (!rdmsrq_safe(MSR_ZEN2_SPECTRAL_CHICKEN, &value)) {
896 value |= MSR_ZEN2_SPECTRAL_CHICKEN_BIT;
897 wrmsrq_safe(MSR_ZEN2_SPECTRAL_CHICKEN, value);
898 }
899 }
900 #endif
901 }
902
init_amd_zen_common(void)903 static void init_amd_zen_common(void)
904 {
905 setup_force_cpu_cap(X86_FEATURE_ZEN);
906 #ifdef CONFIG_NUMA
907 node_reclaim_distance = 32;
908 #endif
909 }
910
init_amd_zen1(struct cpuinfo_x86 * c)911 static void init_amd_zen1(struct cpuinfo_x86 *c)
912 {
913 fix_erratum_1386(c);
914
915 /* Fix up CPUID bits, but only if not virtualised. */
916 if (!cpu_has(c, X86_FEATURE_HYPERVISOR)) {
917
918 /* Erratum 1076: CPB feature bit not being set in CPUID. */
919 if (!cpu_has(c, X86_FEATURE_CPB))
920 set_cpu_cap(c, X86_FEATURE_CPB);
921 }
922
923 pr_notice_once("AMD Zen1 DIV0 bug detected. Disable SMT for full protection.\n");
924 setup_force_cpu_bug(X86_BUG_DIV0);
925
926 /*
927 * Turn off the Instructions Retired free counter on machines that are
928 * susceptible to erratum #1054 "Instructions Retired Performance
929 * Counter May Be Inaccurate".
930 */
931 if (c->x86_model < 0x30) {
932 msr_clear_bit(MSR_K7_HWCR, MSR_K7_HWCR_IRPERF_EN_BIT);
933 clear_cpu_cap(c, X86_FEATURE_IRPERF);
934 }
935 }
936
cpu_has_zenbleed_microcode(void)937 static bool cpu_has_zenbleed_microcode(void)
938 {
939 u32 good_rev = 0;
940
941 switch (boot_cpu_data.x86_model) {
942 case 0x30 ... 0x3f: good_rev = 0x0830107b; break;
943 case 0x60 ... 0x67: good_rev = 0x0860010c; break;
944 case 0x68 ... 0x6f: good_rev = 0x08608107; break;
945 case 0x70 ... 0x7f: good_rev = 0x08701033; break;
946 case 0xa0 ... 0xaf: good_rev = 0x08a00009; break;
947
948 default:
949 return false;
950 }
951
952 if (boot_cpu_data.microcode < good_rev)
953 return false;
954
955 return true;
956 }
957
zen2_zenbleed_check(struct cpuinfo_x86 * c)958 static void zen2_zenbleed_check(struct cpuinfo_x86 *c)
959 {
960 if (cpu_has(c, X86_FEATURE_HYPERVISOR))
961 return;
962
963 if (!cpu_has(c, X86_FEATURE_AVX))
964 return;
965
966 if (!cpu_has_zenbleed_microcode()) {
967 pr_notice_once("Zenbleed: please update your microcode for the most optimal fix\n");
968 msr_set_bit(MSR_AMD64_DE_CFG, MSR_AMD64_DE_CFG_ZEN2_FP_BACKUP_FIX_BIT);
969 } else {
970 msr_clear_bit(MSR_AMD64_DE_CFG, MSR_AMD64_DE_CFG_ZEN2_FP_BACKUP_FIX_BIT);
971 }
972 }
973
init_amd_zen2(struct cpuinfo_x86 * c)974 static void init_amd_zen2(struct cpuinfo_x86 *c)
975 {
976 init_spectral_chicken(c);
977 fix_erratum_1386(c);
978 zen2_zenbleed_check(c);
979
980 /* Disable RDSEED on AMD Cyan Skillfish because of an error. */
981 if (c->x86_model == 0x47 && c->x86_stepping == 0x0) {
982 clear_cpu_cap(c, X86_FEATURE_RDSEED);
983 msr_clear_bit(MSR_AMD64_CPUID_FN_7, 18);
984 pr_emerg("RDSEED is not reliable on this platform; disabling.\n");
985 }
986
987 /* Correct misconfigured CPUID on some clients. */
988 clear_cpu_cap(c, X86_FEATURE_INVLPGB);
989 }
990
init_amd_zen3(struct cpuinfo_x86 * c)991 static void init_amd_zen3(struct cpuinfo_x86 *c)
992 {
993 if (!cpu_has(c, X86_FEATURE_HYPERVISOR)) {
994 /*
995 * Zen3 (Fam19 model < 0x10) parts are not susceptible to
996 * Branch Type Confusion, but predate the allocation of the
997 * BTC_NO bit.
998 */
999 if (!cpu_has(c, X86_FEATURE_BTC_NO))
1000 set_cpu_cap(c, X86_FEATURE_BTC_NO);
1001 }
1002 }
1003
init_amd_zen4(struct cpuinfo_x86 * c)1004 static void init_amd_zen4(struct cpuinfo_x86 *c)
1005 {
1006 if (!cpu_has(c, X86_FEATURE_HYPERVISOR))
1007 msr_set_bit(MSR_ZEN4_BP_CFG, MSR_ZEN4_BP_CFG_SHARED_BTB_FIX_BIT);
1008
1009 /*
1010 * These Zen4 SoCs advertise support for virtualized VMLOAD/VMSAVE
1011 * in some BIOS versions but they can lead to random host reboots.
1012 */
1013 switch (c->x86_model) {
1014 case 0x18 ... 0x1f:
1015 case 0x60 ... 0x7f:
1016 clear_cpu_cap(c, X86_FEATURE_V_VMSAVE_VMLOAD);
1017 break;
1018 }
1019 }
1020
init_amd_zen5(struct cpuinfo_x86 * c)1021 static void init_amd_zen5(struct cpuinfo_x86 *c)
1022 {
1023 }
1024
init_amd(struct cpuinfo_x86 * c)1025 static void init_amd(struct cpuinfo_x86 *c)
1026 {
1027 u64 vm_cr;
1028
1029 early_init_amd(c);
1030
1031 /*
1032 * Bit 31 in normal CPUID used for nonstandard 3DNow ID;
1033 * 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway
1034 */
1035 clear_cpu_cap(c, 0*32+31);
1036
1037 if (c->x86 >= 0x10)
1038 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
1039
1040 /* AMD FSRM also implies FSRS */
1041 if (cpu_has(c, X86_FEATURE_FSRM))
1042 set_cpu_cap(c, X86_FEATURE_FSRS);
1043
1044 /* K6s reports MCEs but don't actually have all the MSRs */
1045 if (c->x86 < 6)
1046 clear_cpu_cap(c, X86_FEATURE_MCE);
1047
1048 switch (c->x86) {
1049 case 4: init_amd_k5(c); break;
1050 case 5: init_amd_k6(c); break;
1051 case 6: init_amd_k7(c); break;
1052 case 0xf: init_amd_k8(c); break;
1053 case 0x10: init_amd_gh(c); break;
1054 case 0x12: init_amd_ln(c); break;
1055 case 0x15: init_amd_bd(c); break;
1056 case 0x16: init_amd_jg(c); break;
1057 }
1058
1059 /*
1060 * Save up on some future enablement work and do common Zen
1061 * settings.
1062 */
1063 if (c->x86 >= 0x17)
1064 init_amd_zen_common();
1065
1066 if (boot_cpu_has(X86_FEATURE_ZEN1))
1067 init_amd_zen1(c);
1068 else if (boot_cpu_has(X86_FEATURE_ZEN2))
1069 init_amd_zen2(c);
1070 else if (boot_cpu_has(X86_FEATURE_ZEN3))
1071 init_amd_zen3(c);
1072 else if (boot_cpu_has(X86_FEATURE_ZEN4))
1073 init_amd_zen4(c);
1074 else if (boot_cpu_has(X86_FEATURE_ZEN5))
1075 init_amd_zen5(c);
1076
1077 /*
1078 * Enable workaround for FXSAVE leak on CPUs
1079 * without a XSaveErPtr feature
1080 */
1081 if ((c->x86 >= 6) && (!cpu_has(c, X86_FEATURE_XSAVEERPTR)))
1082 set_cpu_bug(c, X86_BUG_FXSAVE_LEAK);
1083
1084 cpu_detect_cache_sizes(c);
1085
1086 srat_detect_node(c);
1087
1088 init_amd_cacheinfo(c);
1089
1090 if (cpu_has(c, X86_FEATURE_SVM)) {
1091 rdmsrq(MSR_VM_CR, vm_cr);
1092 if (vm_cr & SVM_VM_CR_SVM_DIS_MASK) {
1093 pr_notice_once("SVM disabled (by BIOS) in MSR_VM_CR\n");
1094 clear_cpu_cap(c, X86_FEATURE_SVM);
1095 }
1096 }
1097
1098 if (!cpu_has(c, X86_FEATURE_LFENCE_RDTSC) && cpu_has(c, X86_FEATURE_XMM2)) {
1099 /*
1100 * Use LFENCE for execution serialization. On families which
1101 * don't have that MSR, LFENCE is already serializing.
1102 * msr_set_bit() uses the safe accessors, too, even if the MSR
1103 * is not present.
1104 */
1105 msr_set_bit(MSR_AMD64_DE_CFG,
1106 MSR_AMD64_DE_CFG_LFENCE_SERIALIZE_BIT);
1107
1108 /* A serializing LFENCE stops RDTSC speculation */
1109 set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
1110 }
1111
1112 /*
1113 * Family 0x12 and above processors have APIC timer
1114 * running in deep C states.
1115 */
1116 if (c->x86 > 0x11)
1117 set_cpu_cap(c, X86_FEATURE_ARAT);
1118
1119 /* 3DNow or LM implies PREFETCHW */
1120 if (!cpu_has(c, X86_FEATURE_3DNOWPREFETCH))
1121 if (cpu_has(c, X86_FEATURE_3DNOW) || cpu_has(c, X86_FEATURE_LM))
1122 set_cpu_cap(c, X86_FEATURE_3DNOWPREFETCH);
1123
1124 /* AMD CPUs don't reset SS attributes on SYSRET, Xen does. */
1125 if (!cpu_feature_enabled(X86_FEATURE_XENPV))
1126 set_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
1127
1128 /* Enable the Instructions Retired free counter */
1129 if (cpu_has(c, X86_FEATURE_IRPERF))
1130 msr_set_bit(MSR_K7_HWCR, MSR_K7_HWCR_IRPERF_EN_BIT);
1131
1132 check_null_seg_clears_base(c);
1133
1134 /*
1135 * Make sure EFER[AIBRSE - Automatic IBRS Enable] is set. The APs are brought up
1136 * using the trampoline code and as part of it, MSR_EFER gets prepared there in
1137 * order to be replicated onto them. Regardless, set it here again, if not set,
1138 * to protect against any future refactoring/code reorganization which might
1139 * miss setting this important bit.
1140 */
1141 if (spectre_v2_in_eibrs_mode(spectre_v2_enabled) &&
1142 cpu_has(c, X86_FEATURE_AUTOIBRS))
1143 WARN_ON_ONCE(msr_set_bit(MSR_EFER, _EFER_AUTOIBRS) < 0);
1144
1145 /* AMD CPUs don't need fencing after x2APIC/TSC_DEADLINE MSR writes. */
1146 clear_cpu_cap(c, X86_FEATURE_APIC_MSRS_FENCE);
1147
1148 /* Enable Translation Cache Extension */
1149 if (cpu_has(c, X86_FEATURE_TCE))
1150 msr_set_bit(MSR_EFER, _EFER_TCE);
1151 }
1152
1153 #ifdef CONFIG_X86_32
amd_size_cache(struct cpuinfo_x86 * c,unsigned int size)1154 static unsigned int amd_size_cache(struct cpuinfo_x86 *c, unsigned int size)
1155 {
1156 /* AMD errata T13 (order #21922) */
1157 if (c->x86 == 6) {
1158 /* Duron Rev A0 */
1159 if (c->x86_model == 3 && c->x86_stepping == 0)
1160 size = 64;
1161 /* Tbird rev A1/A2 */
1162 if (c->x86_model == 4 &&
1163 (c->x86_stepping == 0 || c->x86_stepping == 1))
1164 size = 256;
1165 }
1166 return size;
1167 }
1168 #endif
1169
cpu_detect_tlb_amd(struct cpuinfo_x86 * c)1170 static void cpu_detect_tlb_amd(struct cpuinfo_x86 *c)
1171 {
1172 u32 ebx, eax, ecx, edx;
1173 u16 mask = 0xfff;
1174
1175 if (c->x86 < 0xf)
1176 return;
1177
1178 if (c->extended_cpuid_level < 0x80000006)
1179 return;
1180
1181 cpuid(0x80000006, &eax, &ebx, &ecx, &edx);
1182
1183 tlb_lld_4k = (ebx >> 16) & mask;
1184 tlb_lli_4k = ebx & mask;
1185
1186 /*
1187 * K8 doesn't have 2M/4M entries in the L2 TLB so read out the L1 TLB
1188 * characteristics from the CPUID function 0x80000005 instead.
1189 */
1190 if (c->x86 == 0xf) {
1191 cpuid(0x80000005, &eax, &ebx, &ecx, &edx);
1192 mask = 0xff;
1193 }
1194
1195 /* Handle DTLB 2M and 4M sizes, fall back to L1 if L2 is disabled */
1196 if (!((eax >> 16) & mask))
1197 tlb_lld_2m = (cpuid_eax(0x80000005) >> 16) & 0xff;
1198 else
1199 tlb_lld_2m = (eax >> 16) & mask;
1200
1201 /* a 4M entry uses two 2M entries */
1202 tlb_lld_4m = tlb_lld_2m >> 1;
1203
1204 /* Handle ITLB 2M and 4M sizes, fall back to L1 if L2 is disabled */
1205 if (!(eax & mask)) {
1206 /* Erratum 658 */
1207 if (c->x86 == 0x15 && c->x86_model <= 0x1f) {
1208 tlb_lli_2m = 1024;
1209 } else {
1210 cpuid(0x80000005, &eax, &ebx, &ecx, &edx);
1211 tlb_lli_2m = eax & 0xff;
1212 }
1213 } else
1214 tlb_lli_2m = eax & mask;
1215
1216 tlb_lli_4m = tlb_lli_2m >> 1;
1217
1218 /* Max number of pages INVLPGB can invalidate in one shot */
1219 if (cpu_has(c, X86_FEATURE_INVLPGB))
1220 invlpgb_count_max = (cpuid_edx(0x80000008) & 0xffff) + 1;
1221 }
1222
1223 static const struct cpu_dev amd_cpu_dev = {
1224 .c_vendor = "AMD",
1225 .c_ident = { "AuthenticAMD" },
1226 #ifdef CONFIG_X86_32
1227 .legacy_models = {
1228 { .family = 4, .model_names =
1229 {
1230 [3] = "486 DX/2",
1231 [7] = "486 DX/2-WB",
1232 [8] = "486 DX/4",
1233 [9] = "486 DX/4-WB",
1234 [14] = "Am5x86-WT",
1235 [15] = "Am5x86-WB"
1236 }
1237 },
1238 },
1239 .legacy_cache_size = amd_size_cache,
1240 #endif
1241 .c_early_init = early_init_amd,
1242 .c_detect_tlb = cpu_detect_tlb_amd,
1243 .c_bsp_init = bsp_init_amd,
1244 .c_init = init_amd,
1245 .c_x86_vendor = X86_VENDOR_AMD,
1246 };
1247
1248 cpu_dev_register(amd_cpu_dev);
1249
1250 static DEFINE_PER_CPU_READ_MOSTLY(unsigned long[4], amd_dr_addr_mask);
1251
1252 static unsigned int amd_msr_dr_addr_masks[] = {
1253 MSR_F16H_DR0_ADDR_MASK,
1254 MSR_F16H_DR1_ADDR_MASK,
1255 MSR_F16H_DR1_ADDR_MASK + 1,
1256 MSR_F16H_DR1_ADDR_MASK + 2
1257 };
1258
amd_set_dr_addr_mask(unsigned long mask,unsigned int dr)1259 void amd_set_dr_addr_mask(unsigned long mask, unsigned int dr)
1260 {
1261 int cpu = smp_processor_id();
1262
1263 if (!cpu_feature_enabled(X86_FEATURE_BPEXT))
1264 return;
1265
1266 if (WARN_ON_ONCE(dr >= ARRAY_SIZE(amd_msr_dr_addr_masks)))
1267 return;
1268
1269 if (per_cpu(amd_dr_addr_mask, cpu)[dr] == mask)
1270 return;
1271
1272 wrmsrq(amd_msr_dr_addr_masks[dr], mask);
1273 per_cpu(amd_dr_addr_mask, cpu)[dr] = mask;
1274 }
1275
amd_get_dr_addr_mask(unsigned int dr)1276 unsigned long amd_get_dr_addr_mask(unsigned int dr)
1277 {
1278 if (!cpu_feature_enabled(X86_FEATURE_BPEXT))
1279 return 0;
1280
1281 if (WARN_ON_ONCE(dr >= ARRAY_SIZE(amd_msr_dr_addr_masks)))
1282 return 0;
1283
1284 return per_cpu(amd_dr_addr_mask[dr], smp_processor_id());
1285 }
1286 EXPORT_SYMBOL_GPL(amd_get_dr_addr_mask);
1287
zenbleed_check_cpu(void * unused)1288 static void zenbleed_check_cpu(void *unused)
1289 {
1290 struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
1291
1292 zen2_zenbleed_check(c);
1293 }
1294
amd_check_microcode(void)1295 void amd_check_microcode(void)
1296 {
1297 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
1298 return;
1299
1300 if (cpu_feature_enabled(X86_FEATURE_ZEN2))
1301 on_each_cpu(zenbleed_check_cpu, NULL, 1);
1302 }
1303
1304 static const char * const s5_reset_reason_txt[] = {
1305 [0] = "thermal pin BP_THERMTRIP_L was tripped",
1306 [1] = "power button was pressed for 4 seconds",
1307 [2] = "shutdown pin was tripped",
1308 [4] = "remote ASF power off command was received",
1309 [9] = "internal CPU thermal limit was tripped",
1310 [16] = "system reset pin BP_SYS_RST_L was tripped",
1311 [17] = "software issued PCI reset",
1312 [18] = "software wrote 0x4 to reset control register 0xCF9",
1313 [19] = "software wrote 0x6 to reset control register 0xCF9",
1314 [20] = "software wrote 0xE to reset control register 0xCF9",
1315 [21] = "ACPI power state transition occurred",
1316 [22] = "keyboard reset pin KB_RST_L was tripped",
1317 [23] = "internal CPU shutdown event occurred",
1318 [24] = "system failed to boot before failed boot timer expired",
1319 [25] = "hardware watchdog timer expired",
1320 [26] = "remote ASF reset command was received",
1321 [27] = "an uncorrected error caused a data fabric sync flood event",
1322 [29] = "FCH and MP1 failed warm reset handshake",
1323 [30] = "a parity error occurred",
1324 [31] = "a software sync flood event occurred",
1325 };
1326
print_s5_reset_status_mmio(void)1327 static __init int print_s5_reset_status_mmio(void)
1328 {
1329 unsigned long value;
1330 void __iomem *addr;
1331 int i;
1332
1333 if (!cpu_feature_enabled(X86_FEATURE_ZEN))
1334 return 0;
1335
1336 addr = ioremap(FCH_PM_BASE + FCH_PM_S5_RESET_STATUS, sizeof(value));
1337 if (!addr)
1338 return 0;
1339
1340 value = ioread32(addr);
1341 iounmap(addr);
1342
1343 for (i = 0; i < ARRAY_SIZE(s5_reset_reason_txt); i++) {
1344 if (!(value & BIT(i)))
1345 continue;
1346
1347 if (s5_reset_reason_txt[i]) {
1348 pr_info("x86/amd: Previous system reset reason [0x%08lx]: %s\n",
1349 value, s5_reset_reason_txt[i]);
1350 }
1351 }
1352
1353 return 0;
1354 }
1355 late_initcall(print_s5_reset_status_mmio);
1356