1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
22decb194SH. Peter Anvin /*
32decb194SH. Peter Anvin * Check for extended topology enumeration cpuid leaf 0xb and if it
42decb194SH. Peter Anvin * exists, use it for populating initial_apicid and cpu topology
52decb194SH. Peter Anvin * detection.
62decb194SH. Peter Anvin */
72decb194SH. Peter Anvin
82decb194SH. Peter Anvin #include <linux/cpu.h>
92decb194SH. Peter Anvin #include <asm/apic.h>
10eb243d1dSIngo Molnar #include <asm/memtype.h>
112decb194SH. Peter Anvin #include <asm/processor.h>
122decb194SH. Peter Anvin
13ad3bc25aSBorislav Petkov #include "cpu.h"
14ad3bc25aSBorislav Petkov
152decb194SH. Peter Anvin /* leaf 0xb SMT level */
162decb194SH. Peter Anvin #define SMT_LEVEL 0
172decb194SH. Peter Anvin
187745f03eSLen Brown /* extended topology sub-leaf types */
192decb194SH. Peter Anvin #define INVALID_TYPE 0
202decb194SH. Peter Anvin #define SMT_TYPE 1
212decb194SH. Peter Anvin #define CORE_TYPE 2
227745f03eSLen Brown #define DIE_TYPE 5
232decb194SH. Peter Anvin
242decb194SH. Peter Anvin #define LEAFB_SUBTYPE(ecx) (((ecx) >> 8) & 0xff)
252decb194SH. Peter Anvin #define BITS_SHIFT_NEXT_LEVEL(eax) ((eax) & 0x1f)
262decb194SH. Peter Anvin #define LEVEL_MAX_SIBLINGS(ebx) ((ebx) & 0xffff)
272decb194SH. Peter Anvin
2814d96d6cSLen Brown unsigned int __max_die_per_package __read_mostly = 1;
2914d96d6cSLen Brown EXPORT_SYMBOL(__max_die_per_package);
3014d96d6cSLen Brown
311eb8f690SBorislav Petkov #ifdef CONFIG_SMP
327745f03eSLen Brown /*
33d9f6e12fSIngo Molnar * Check if given CPUID extended topology "leaf" is implemented
347745f03eSLen Brown */
check_extended_topology_leaf(int leaf)357745f03eSLen Brown static int check_extended_topology_leaf(int leaf)
367745f03eSLen Brown {
377745f03eSLen Brown unsigned int eax, ebx, ecx, edx;
387745f03eSLen Brown
397745f03eSLen Brown cpuid_count(leaf, SMT_LEVEL, &eax, &ebx, &ecx, &edx);
407745f03eSLen Brown
417745f03eSLen Brown if (ebx == 0 || (LEAFB_SUBTYPE(ecx) != SMT_TYPE))
427745f03eSLen Brown return -1;
437745f03eSLen Brown
447745f03eSLen Brown return 0;
457745f03eSLen Brown }
467745f03eSLen Brown /*
47d9f6e12fSIngo Molnar * Return best CPUID Extended Topology Leaf supported
487745f03eSLen Brown */
detect_extended_topology_leaf(struct cpuinfo_x86 * c)497745f03eSLen Brown static int detect_extended_topology_leaf(struct cpuinfo_x86 *c)
507745f03eSLen Brown {
517745f03eSLen Brown if (c->cpuid_level >= 0x1f) {
527745f03eSLen Brown if (check_extended_topology_leaf(0x1f) == 0)
537745f03eSLen Brown return 0x1f;
547745f03eSLen Brown }
557745f03eSLen Brown
567745f03eSLen Brown if (c->cpuid_level >= 0xb) {
577745f03eSLen Brown if (check_extended_topology_leaf(0xb) == 0)
587745f03eSLen Brown return 0xb;
597745f03eSLen Brown }
607745f03eSLen Brown
617745f03eSLen Brown return -1;
627745f03eSLen Brown }
637745f03eSLen Brown #endif
647745f03eSLen Brown
detect_extended_topology_early(struct cpuinfo_x86 * c)6595f3d39cSThomas Gleixner int detect_extended_topology_early(struct cpuinfo_x86 *c)
662decb194SH. Peter Anvin {
672decb194SH. Peter Anvin #ifdef CONFIG_SMP
6895f3d39cSThomas Gleixner unsigned int eax, ebx, ecx, edx;
697745f03eSLen Brown int leaf;
702decb194SH. Peter Anvin
717745f03eSLen Brown leaf = detect_extended_topology_leaf(c);
727745f03eSLen Brown if (leaf < 0)
736c4f5abaSSuravee Suthikulpanit return -1;
742decb194SH. Peter Anvin
752decb194SH. Peter Anvin set_cpu_cap(c, X86_FEATURE_XTOPOLOGY);
762decb194SH. Peter Anvin
777745f03eSLen Brown cpuid_count(leaf, SMT_LEVEL, &eax, &ebx, &ecx, &edx);
782decb194SH. Peter Anvin /*
792decb194SH. Peter Anvin * initial apic id, which also represents 32-bit extended x2apic id.
802decb194SH. Peter Anvin */
812decb194SH. Peter Anvin c->initial_apicid = edx;
82*edc0a2b5SZhang Rui smp_num_siblings = max_t(int, smp_num_siblings, LEVEL_MAX_SIBLINGS(ebx));
8395f3d39cSThomas Gleixner #endif
8495f3d39cSThomas Gleixner return 0;
8595f3d39cSThomas Gleixner }
8695f3d39cSThomas Gleixner
8795f3d39cSThomas Gleixner /*
887745f03eSLen Brown * Check for extended topology enumeration cpuid leaf, and if it
8995f3d39cSThomas Gleixner * exists, use it for populating initial_apicid and cpu topology
9095f3d39cSThomas Gleixner * detection.
9195f3d39cSThomas Gleixner */
detect_extended_topology(struct cpuinfo_x86 * c)9295f3d39cSThomas Gleixner int detect_extended_topology(struct cpuinfo_x86 *c)
9395f3d39cSThomas Gleixner {
9495f3d39cSThomas Gleixner #ifdef CONFIG_SMP
9595f3d39cSThomas Gleixner unsigned int eax, ebx, ecx, edx, sub_index;
967745f03eSLen Brown unsigned int ht_mask_width, core_plus_mask_width, die_plus_mask_width;
9795f3d39cSThomas Gleixner unsigned int core_select_mask, core_level_siblings;
987745f03eSLen Brown unsigned int die_select_mask, die_level_siblings;
992b12a7a1SZhang Rui unsigned int pkg_mask_width;
100cb09a379SYazen Ghannam bool die_level_present = false;
1017745f03eSLen Brown int leaf;
10295f3d39cSThomas Gleixner
1037745f03eSLen Brown leaf = detect_extended_topology_leaf(c);
1047745f03eSLen Brown if (leaf < 0)
10595f3d39cSThomas Gleixner return -1;
1062decb194SH. Peter Anvin
1072decb194SH. Peter Anvin /*
1082decb194SH. Peter Anvin * Populate HT related information from sub-leaf level 0.
1092decb194SH. Peter Anvin */
1107745f03eSLen Brown cpuid_count(leaf, SMT_LEVEL, &eax, &ebx, &ecx, &edx);
1117745f03eSLen Brown c->initial_apicid = edx;
112*edc0a2b5SZhang Rui core_level_siblings = LEVEL_MAX_SIBLINGS(ebx);
113*edc0a2b5SZhang Rui smp_num_siblings = max_t(int, smp_num_siblings, LEVEL_MAX_SIBLINGS(ebx));
1142decb194SH. Peter Anvin core_plus_mask_width = ht_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
1157745f03eSLen Brown die_level_siblings = LEVEL_MAX_SIBLINGS(ebx);
1162b12a7a1SZhang Rui pkg_mask_width = die_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
1172decb194SH. Peter Anvin
1182decb194SH. Peter Anvin sub_index = 1;
1192b12a7a1SZhang Rui while (true) {
1207745f03eSLen Brown cpuid_count(leaf, sub_index, &eax, &ebx, &ecx, &edx);
1212decb194SH. Peter Anvin
1222decb194SH. Peter Anvin /*
1232decb194SH. Peter Anvin * Check for the Core type in the implemented sub leaves.
1242decb194SH. Peter Anvin */
1252decb194SH. Peter Anvin if (LEAFB_SUBTYPE(ecx) == CORE_TYPE) {
1262decb194SH. Peter Anvin core_level_siblings = LEVEL_MAX_SIBLINGS(ebx);
1272decb194SH. Peter Anvin core_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
1287745f03eSLen Brown die_level_siblings = core_level_siblings;
1297745f03eSLen Brown die_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
1307745f03eSLen Brown }
1317745f03eSLen Brown if (LEAFB_SUBTYPE(ecx) == DIE_TYPE) {
132cb09a379SYazen Ghannam die_level_present = true;
1337745f03eSLen Brown die_level_siblings = LEVEL_MAX_SIBLINGS(ebx);
1347745f03eSLen Brown die_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
1352decb194SH. Peter Anvin }
1362decb194SH. Peter Anvin
1372b12a7a1SZhang Rui if (LEAFB_SUBTYPE(ecx) != INVALID_TYPE)
1382b12a7a1SZhang Rui pkg_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
1392b12a7a1SZhang Rui else
1402b12a7a1SZhang Rui break;
1412b12a7a1SZhang Rui
1422decb194SH. Peter Anvin sub_index++;
1432b12a7a1SZhang Rui }
1442decb194SH. Peter Anvin
14571eac706SZhang Rui core_select_mask = (~(-1 << pkg_mask_width)) >> ht_mask_width;
1467745f03eSLen Brown die_select_mask = (~(-1 << die_plus_mask_width)) >>
1477745f03eSLen Brown core_plus_mask_width;
1482decb194SH. Peter Anvin
1497745f03eSLen Brown c->cpu_core_id = apic->phys_pkg_id(c->initial_apicid,
1507745f03eSLen Brown ht_mask_width) & core_select_mask;
151cb09a379SYazen Ghannam
152cb09a379SYazen Ghannam if (die_level_present) {
1537745f03eSLen Brown c->cpu_die_id = apic->phys_pkg_id(c->initial_apicid,
1547745f03eSLen Brown core_plus_mask_width) & die_select_mask;
155cb09a379SYazen Ghannam }
156cb09a379SYazen Ghannam
1577745f03eSLen Brown c->phys_proc_id = apic->phys_pkg_id(c->initial_apicid,
1582b12a7a1SZhang Rui pkg_mask_width);
1592decb194SH. Peter Anvin /*
1602decb194SH. Peter Anvin * Reinit the apicid, now that we have extended initial_apicid.
1612decb194SH. Peter Anvin */
1622decb194SH. Peter Anvin c->apicid = apic->phys_pkg_id(c->initial_apicid, 0);
1632decb194SH. Peter Anvin
1642decb194SH. Peter Anvin c->x86_max_cores = (core_level_siblings / smp_num_siblings);
16514d96d6cSLen Brown __max_die_per_package = (die_level_siblings / core_level_siblings);
1662decb194SH. Peter Anvin #endif
1676c4f5abaSSuravee Suthikulpanit return 0;
1682decb194SH. Peter Anvin }
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