Venki Pallipadi | 1d67953 | 2007-07-11 12:18:32 -0700 | [diff] [blame] | 1 | /* |
H. Peter Anvin | 2decb19 | 2010-07-19 18:32:04 -0700 | [diff] [blame] | 2 | * Check for extended topology enumeration cpuid leaf 0xb and if it |
| 3 | * exists, use it for populating initial_apicid and cpu topology |
| 4 | * detection. |
Venki Pallipadi | 1d67953 | 2007-07-11 12:18:32 -0700 | [diff] [blame] | 5 | */ |
Venki Pallipadi | 1d67953 | 2007-07-11 12:18:32 -0700 | [diff] [blame] | 6 | |
H. Peter Anvin | 2decb19 | 2010-07-19 18:32:04 -0700 | [diff] [blame] | 7 | #include <linux/cpu.h> |
| 8 | #include <asm/apic.h> |
Thomas Gleixner | 8d4a430 | 2008-05-08 09:18:43 +0200 | [diff] [blame] | 9 | #include <asm/pat.h> |
Venki Pallipadi | 1d67953 | 2007-07-11 12:18:32 -0700 | [diff] [blame] | 10 | #include <asm/processor.h> |
| 11 | |
Suresh Siddha | bbb65d2 | 2008-08-23 17:47:10 +0200 | [diff] [blame] | 12 | /* leaf 0xb SMT level */ |
| 13 | #define SMT_LEVEL 0 |
| 14 | |
| 15 | /* leaf 0xb sub-leaf types */ |
| 16 | #define INVALID_TYPE 0 |
| 17 | #define SMT_TYPE 1 |
| 18 | #define CORE_TYPE 2 |
| 19 | |
| 20 | #define LEAFB_SUBTYPE(ecx) (((ecx) >> 8) & 0xff) |
| 21 | #define BITS_SHIFT_NEXT_LEVEL(eax) ((eax) & 0x1f) |
| 22 | #define LEVEL_MAX_SIBLINGS(ebx) ((ebx) & 0xffff) |
| 23 | |
| 24 | /* |
| 25 | * Check for extended topology enumeration cpuid leaf 0xb and if it |
| 26 | * exists, use it for populating initial_apicid and cpu topology |
| 27 | * detection. |
| 28 | */ |
| 29 | void __cpuinit detect_extended_topology(struct cpuinfo_x86 *c) |
| 30 | { |
Ingo Molnar | 3e5095d | 2009-01-27 17:07:08 +0100 | [diff] [blame] | 31 | #ifdef CONFIG_SMP |
Suresh Siddha | bbb65d2 | 2008-08-23 17:47:10 +0200 | [diff] [blame] | 32 | unsigned int eax, ebx, ecx, edx, sub_index; |
| 33 | unsigned int ht_mask_width, core_plus_mask_width; |
| 34 | unsigned int core_select_mask, core_level_siblings; |
Mike Travis | 2eaad1f | 2009-12-10 17:19:36 -0800 | [diff] [blame] | 35 | static bool printed; |
Suresh Siddha | bbb65d2 | 2008-08-23 17:47:10 +0200 | [diff] [blame] | 36 | |
| 37 | if (c->cpuid_level < 0xb) |
| 38 | return; |
| 39 | |
| 40 | cpuid_count(0xb, SMT_LEVEL, &eax, &ebx, &ecx, &edx); |
| 41 | |
| 42 | /* |
| 43 | * check if the cpuid leaf 0xb is actually implemented. |
| 44 | */ |
| 45 | if (ebx == 0 || (LEAFB_SUBTYPE(ecx) != SMT_TYPE)) |
| 46 | return; |
| 47 | |
| 48 | set_cpu_cap(c, X86_FEATURE_XTOPOLOGY); |
| 49 | |
| 50 | /* |
| 51 | * initial apic id, which also represents 32-bit extended x2apic id. |
| 52 | */ |
| 53 | c->initial_apicid = edx; |
| 54 | |
| 55 | /* |
| 56 | * Populate HT related information from sub-leaf level 0. |
| 57 | */ |
| 58 | core_level_siblings = smp_num_siblings = LEVEL_MAX_SIBLINGS(ebx); |
| 59 | core_plus_mask_width = ht_mask_width = BITS_SHIFT_NEXT_LEVEL(eax); |
| 60 | |
| 61 | sub_index = 1; |
| 62 | do { |
| 63 | cpuid_count(0xb, sub_index, &eax, &ebx, &ecx, &edx); |
| 64 | |
| 65 | /* |
| 66 | * Check for the Core type in the implemented sub leaves. |
| 67 | */ |
| 68 | if (LEAFB_SUBTYPE(ecx) == CORE_TYPE) { |
| 69 | core_level_siblings = LEVEL_MAX_SIBLINGS(ebx); |
| 70 | core_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax); |
| 71 | break; |
| 72 | } |
| 73 | |
| 74 | sub_index++; |
| 75 | } while (LEAFB_SUBTYPE(ecx) != INVALID_TYPE); |
| 76 | |
| 77 | core_select_mask = (~(-1 << core_plus_mask_width)) >> ht_mask_width; |
| 78 | |
Ingo Molnar | cb8cc44 | 2009-01-28 13:24:54 +0100 | [diff] [blame] | 79 | c->cpu_core_id = apic->phys_pkg_id(c->initial_apicid, ht_mask_width) |
Suresh Siddha | bbb65d2 | 2008-08-23 17:47:10 +0200 | [diff] [blame] | 80 | & core_select_mask; |
Ingo Molnar | cb8cc44 | 2009-01-28 13:24:54 +0100 | [diff] [blame] | 81 | c->phys_proc_id = apic->phys_pkg_id(c->initial_apicid, core_plus_mask_width); |
Suresh Siddha | 345077c | 2008-12-18 18:09:21 -0800 | [diff] [blame] | 82 | /* |
| 83 | * Reinit the apicid, now that we have extended initial_apicid. |
| 84 | */ |
Ingo Molnar | cb8cc44 | 2009-01-28 13:24:54 +0100 | [diff] [blame] | 85 | c->apicid = apic->phys_pkg_id(c->initial_apicid, 0); |
Ingo Molnar | d4c9a9f | 2009-01-28 13:31:22 +0100 | [diff] [blame] | 86 | |
Suresh Siddha | bbb65d2 | 2008-08-23 17:47:10 +0200 | [diff] [blame] | 87 | c->x86_max_cores = (core_level_siblings / smp_num_siblings); |
| 88 | |
Mike Travis | 2eaad1f | 2009-12-10 17:19:36 -0800 | [diff] [blame] | 89 | if (!printed) { |
| 90 | printk(KERN_INFO "CPU: Physical Processor ID: %d\n", |
| 91 | c->phys_proc_id); |
| 92 | if (c->x86_max_cores > 1) |
| 93 | printk(KERN_INFO "CPU: Processor Core ID: %d\n", |
| 94 | c->cpu_core_id); |
| 95 | printed = 1; |
| 96 | } |
Suresh Siddha | bbb65d2 | 2008-08-23 17:47:10 +0200 | [diff] [blame] | 97 | return; |
Suresh Siddha | 11c231a9 | 2008-08-23 17:47:11 +0200 | [diff] [blame] | 98 | #endif |
Suresh Siddha | bbb65d2 | 2008-08-23 17:47:10 +0200 | [diff] [blame] | 99 | } |