1 /* 2 * x86 CPU topology data structures and functions 3 * 4 * Copyright (c) 2012 Red Hat Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 #ifndef HW_I386_TOPOLOGY_H 25 #define HW_I386_TOPOLOGY_H 26 27 /* This file implements the APIC-ID-based CPU topology enumeration logic, 28 * documented at the following document: 29 * Intel® 64 Architecture Processor Topology Enumeration 30 * http://software.intel.com/en-us/articles/intel-64-architecture-processor-topology-enumeration/ 31 * 32 * This code should be compatible with AMD's "Extended Method" described at: 33 * AMD CPUID Specification (Publication #25481) 34 * Section 3: Multiple Core Calcuation 35 * as long as: 36 * nr_threads is set to 1; 37 * OFFSET_IDX is assumed to be 0; 38 * CPUID Fn8000_0008_ECX[ApicIdCoreIdSize[3:0]] is set to apicid_core_width(). 39 */ 40 41 42 #include "qemu/bitops.h" 43 44 /* APIC IDs can be 32-bit, but beware: APIC IDs > 255 require x2APIC support 45 */ 46 typedef uint32_t apic_id_t; 47 48 typedef struct X86CPUTopoIDs { 49 unsigned pkg_id; 50 unsigned die_id; 51 unsigned core_id; 52 unsigned smt_id; 53 } X86CPUTopoIDs; 54 55 typedef struct X86CPUTopoInfo { 56 unsigned nodes_per_pkg; 57 unsigned dies_per_pkg; 58 unsigned cores_per_die; 59 unsigned threads_per_core; 60 } X86CPUTopoInfo; 61 62 /* Return the bit width needed for 'count' IDs 63 */ 64 static unsigned apicid_bitwidth_for_count(unsigned count) 65 { 66 g_assert(count >= 1); 67 count -= 1; 68 return count ? 32 - clz32(count) : 0; 69 } 70 71 /* Bit width of the SMT_ID (thread ID) field on the APIC ID 72 */ 73 static inline unsigned apicid_smt_width(X86CPUTopoInfo *topo_info) 74 { 75 return apicid_bitwidth_for_count(topo_info->threads_per_core); 76 } 77 78 /* Bit width of the Core_ID field 79 */ 80 static inline unsigned apicid_core_width(X86CPUTopoInfo *topo_info) 81 { 82 return apicid_bitwidth_for_count(topo_info->cores_per_die); 83 } 84 85 /* Bit width of the Die_ID field */ 86 static inline unsigned apicid_die_width(X86CPUTopoInfo *topo_info) 87 { 88 return apicid_bitwidth_for_count(topo_info->dies_per_pkg); 89 } 90 91 /* Bit offset of the Core_ID field 92 */ 93 static inline unsigned apicid_core_offset(X86CPUTopoInfo *topo_info) 94 { 95 return apicid_smt_width(topo_info); 96 } 97 98 /* Bit offset of the Die_ID field */ 99 static inline unsigned apicid_die_offset(X86CPUTopoInfo *topo_info) 100 { 101 return apicid_core_offset(topo_info) + apicid_core_width(topo_info); 102 } 103 104 /* Bit offset of the Pkg_ID (socket ID) field 105 */ 106 static inline unsigned apicid_pkg_offset(X86CPUTopoInfo *topo_info) 107 { 108 return apicid_die_offset(topo_info) + apicid_die_width(topo_info); 109 } 110 111 /* Make APIC ID for the CPU based on Pkg_ID, Core_ID, SMT_ID 112 * 113 * The caller must make sure core_id < nr_cores and smt_id < nr_threads. 114 */ 115 static inline apic_id_t x86_apicid_from_topo_ids(X86CPUTopoInfo *topo_info, 116 const X86CPUTopoIDs *topo_ids) 117 { 118 return (topo_ids->pkg_id << apicid_pkg_offset(topo_info)) | 119 (topo_ids->die_id << apicid_die_offset(topo_info)) | 120 (topo_ids->core_id << apicid_core_offset(topo_info)) | 121 topo_ids->smt_id; 122 } 123 124 /* Calculate thread/core/package IDs for a specific topology, 125 * based on (contiguous) CPU index 126 */ 127 static inline void x86_topo_ids_from_idx(X86CPUTopoInfo *topo_info, 128 unsigned cpu_index, 129 X86CPUTopoIDs *topo_ids) 130 { 131 unsigned nr_dies = topo_info->dies_per_pkg; 132 unsigned nr_cores = topo_info->cores_per_die; 133 unsigned nr_threads = topo_info->threads_per_core; 134 135 topo_ids->pkg_id = cpu_index / (nr_dies * nr_cores * nr_threads); 136 topo_ids->die_id = cpu_index / (nr_cores * nr_threads) % nr_dies; 137 topo_ids->core_id = cpu_index / nr_threads % nr_cores; 138 topo_ids->smt_id = cpu_index % nr_threads; 139 } 140 141 /* Calculate thread/core/package IDs for a specific topology, 142 * based on APIC ID 143 */ 144 static inline void x86_topo_ids_from_apicid(apic_id_t apicid, 145 X86CPUTopoInfo *topo_info, 146 X86CPUTopoIDs *topo_ids) 147 { 148 topo_ids->smt_id = apicid & 149 ~(0xFFFFFFFFUL << apicid_smt_width(topo_info)); 150 topo_ids->core_id = 151 (apicid >> apicid_core_offset(topo_info)) & 152 ~(0xFFFFFFFFUL << apicid_core_width(topo_info)); 153 topo_ids->die_id = 154 (apicid >> apicid_die_offset(topo_info)) & 155 ~(0xFFFFFFFFUL << apicid_die_width(topo_info)); 156 topo_ids->pkg_id = apicid >> apicid_pkg_offset(topo_info); 157 } 158 159 /* Make APIC ID for the CPU 'cpu_index' 160 * 161 * 'cpu_index' is a sequential, contiguous ID for the CPU. 162 */ 163 static inline apic_id_t x86_apicid_from_cpu_idx(X86CPUTopoInfo *topo_info, 164 unsigned cpu_index) 165 { 166 X86CPUTopoIDs topo_ids; 167 x86_topo_ids_from_idx(topo_info, cpu_index, &topo_ids); 168 return x86_apicid_from_topo_ids(topo_info, &topo_ids); 169 } 170 171 #endif /* HW_I386_TOPOLOGY_H */ 172