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 /* 28 * This file implements the APIC-ID-based CPU topology enumeration logic, 29 * documented at the following document: 30 * Intel® 64 Architecture Processor Topology Enumeration 31 * http://software.intel.com/en-us/articles/intel-64-architecture-processor-topology-enumeration/ 32 * 33 * This code should be compatible with AMD's "Extended Method" described at: 34 * AMD CPUID Specification (Publication #25481) 35 * Section 3: Multiple Core Calculation 36 * as long as: 37 * nr_threads is set to 1; 38 * OFFSET_IDX is assumed to be 0; 39 * CPUID Fn8000_0008_ECX[ApicIdCoreIdSize[3:0]] is set to apicid_core_width(). 40 */ 41 42 #include "qapi/qapi-types-machine-common.h" 43 #include "qemu/bitops.h" 44 45 /* 46 * APIC IDs can be 32-bit, but beware: APIC IDs > 255 require x2APIC support 47 */ 48 typedef uint32_t apic_id_t; 49 50 typedef struct X86CPUTopoIDs { 51 unsigned pkg_id; 52 unsigned die_id; 53 unsigned module_id; 54 unsigned core_id; 55 unsigned smt_id; 56 } X86CPUTopoIDs; 57 58 typedef struct X86CPUTopoInfo { 59 unsigned dies_per_pkg; 60 unsigned modules_per_die; 61 unsigned cores_per_module; 62 unsigned threads_per_core; 63 } X86CPUTopoInfo; 64 65 #define CPU_TOPOLOGY_LEVEL_INVALID CPU_TOPOLOGY_LEVEL__MAX 66 67 /* Return the bit width needed for 'count' IDs */ 68 static unsigned apicid_bitwidth_for_count(unsigned count) 69 { 70 g_assert(count >= 1); 71 count -= 1; 72 return count ? 32 - clz32(count) : 0; 73 } 74 75 /* Bit width of the SMT_ID (thread ID) field on the APIC ID */ 76 static inline unsigned apicid_smt_width(X86CPUTopoInfo *topo_info) 77 { 78 return apicid_bitwidth_for_count(topo_info->threads_per_core); 79 } 80 81 /* Bit width of the Core_ID field */ 82 static inline unsigned apicid_core_width(X86CPUTopoInfo *topo_info) 83 { 84 return apicid_bitwidth_for_count(topo_info->cores_per_module); 85 } 86 87 /* Bit width of the Module_ID field */ 88 static inline unsigned apicid_module_width(X86CPUTopoInfo *topo_info) 89 { 90 return apicid_bitwidth_for_count(topo_info->modules_per_die); 91 } 92 93 /* Bit width of the Die_ID field */ 94 static inline unsigned apicid_die_width(X86CPUTopoInfo *topo_info) 95 { 96 return apicid_bitwidth_for_count(topo_info->dies_per_pkg); 97 } 98 99 /* Bit offset of the Core_ID field */ 100 static inline unsigned apicid_core_offset(X86CPUTopoInfo *topo_info) 101 { 102 return apicid_smt_width(topo_info); 103 } 104 105 /* Bit offset of the Module_ID field */ 106 static inline unsigned apicid_module_offset(X86CPUTopoInfo *topo_info) 107 { 108 return apicid_core_offset(topo_info) + apicid_core_width(topo_info); 109 } 110 111 /* Bit offset of the Die_ID field */ 112 static inline unsigned apicid_die_offset(X86CPUTopoInfo *topo_info) 113 { 114 return apicid_module_offset(topo_info) + apicid_module_width(topo_info); 115 } 116 117 /* Bit offset of the Pkg_ID (socket ID) field */ 118 static inline unsigned apicid_pkg_offset(X86CPUTopoInfo *topo_info) 119 { 120 return apicid_die_offset(topo_info) + apicid_die_width(topo_info); 121 } 122 123 /* 124 * Make APIC ID for the CPU based on Pkg_ID, Core_ID, SMT_ID 125 * 126 * The caller must make sure core_id < nr_cores and smt_id < nr_threads. 127 */ 128 static inline apic_id_t x86_apicid_from_topo_ids(X86CPUTopoInfo *topo_info, 129 const X86CPUTopoIDs *topo_ids) 130 { 131 return (topo_ids->pkg_id << apicid_pkg_offset(topo_info)) | 132 (topo_ids->die_id << apicid_die_offset(topo_info)) | 133 (topo_ids->module_id << apicid_module_offset(topo_info)) | 134 (topo_ids->core_id << apicid_core_offset(topo_info)) | 135 topo_ids->smt_id; 136 } 137 138 /* 139 * Calculate thread/core/package IDs for a specific topology, 140 * based on (contiguous) CPU index 141 */ 142 static inline void x86_topo_ids_from_idx(X86CPUTopoInfo *topo_info, 143 unsigned cpu_index, 144 X86CPUTopoIDs *topo_ids) 145 { 146 unsigned nr_dies = topo_info->dies_per_pkg; 147 unsigned nr_modules = topo_info->modules_per_die; 148 unsigned nr_cores = topo_info->cores_per_module; 149 unsigned nr_threads = topo_info->threads_per_core; 150 151 topo_ids->pkg_id = cpu_index / (nr_dies * nr_modules * 152 nr_cores * nr_threads); 153 topo_ids->die_id = cpu_index / (nr_modules * nr_cores * 154 nr_threads) % nr_dies; 155 topo_ids->module_id = cpu_index / (nr_cores * nr_threads) % 156 nr_modules; 157 topo_ids->core_id = cpu_index / nr_threads % nr_cores; 158 topo_ids->smt_id = cpu_index % nr_threads; 159 } 160 161 /* 162 * Calculate thread/core/package IDs for a specific topology, 163 * based on APIC ID 164 */ 165 static inline void x86_topo_ids_from_apicid(apic_id_t apicid, 166 X86CPUTopoInfo *topo_info, 167 X86CPUTopoIDs *topo_ids) 168 { 169 topo_ids->smt_id = apicid & 170 ~(0xFFFFFFFFUL << apicid_smt_width(topo_info)); 171 topo_ids->core_id = 172 (apicid >> apicid_core_offset(topo_info)) & 173 ~(0xFFFFFFFFUL << apicid_core_width(topo_info)); 174 topo_ids->module_id = 175 (apicid >> apicid_module_offset(topo_info)) & 176 ~(0xFFFFFFFFUL << apicid_module_width(topo_info)); 177 topo_ids->die_id = 178 (apicid >> apicid_die_offset(topo_info)) & 179 ~(0xFFFFFFFFUL << apicid_die_width(topo_info)); 180 topo_ids->pkg_id = apicid >> apicid_pkg_offset(topo_info); 181 } 182 183 /* 184 * Make APIC ID for the CPU 'cpu_index' 185 * 186 * 'cpu_index' is a sequential, contiguous ID for the CPU. 187 */ 188 static inline apic_id_t x86_apicid_from_cpu_idx(X86CPUTopoInfo *topo_info, 189 unsigned cpu_index) 190 { 191 X86CPUTopoIDs topo_ids; 192 x86_topo_ids_from_idx(topo_info, cpu_index, &topo_ids); 193 return x86_apicid_from_topo_ids(topo_info, &topo_ids); 194 } 195 196 /* 197 * Check whether there's extended topology level (module or die)? 198 */ 199 static inline bool x86_has_extended_topo(unsigned long *topo_bitmap) 200 { 201 return test_bit(CPU_TOPOLOGY_LEVEL_MODULE, topo_bitmap) || 202 test_bit(CPU_TOPOLOGY_LEVEL_DIE, topo_bitmap); 203 } 204 205 #endif /* HW_I386_TOPOLOGY_H */ 206