1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef ARCH_X86_TOPOLOGY_H 3 #define ARCH_X86_TOPOLOGY_H 4 5 struct topo_scan { 6 struct cpuinfo_x86 *c; 7 unsigned int dom_shifts[TOPO_MAX_DOMAIN]; 8 unsigned int dom_ncpus[TOPO_MAX_DOMAIN]; 9 10 /* Legacy CPUID[1]:EBX[23:16] number of logical processors */ 11 unsigned int ebx1_nproc_shift; 12 13 /* AMD specific node ID which cannot be mapped into APIC space. */ 14 u16 amd_nodes_per_pkg; 15 u16 amd_node_id; 16 }; 17 18 void cpu_init_topology(struct cpuinfo_x86 *c); 19 void cpu_parse_topology(struct cpuinfo_x86 *c); 20 void topology_set_dom(struct topo_scan *tscan, enum x86_topology_domains dom, 21 unsigned int shift, unsigned int ncpus); 22 bool cpu_parse_topology_ext(struct topo_scan *tscan); 23 void cpu_parse_topology_amd(struct topo_scan *tscan); 24 void cpu_topology_fixup_amd(struct topo_scan *tscan); 25 26 static inline u32 topo_shift_apicid(u32 apicid, enum x86_topology_domains dom) 27 { 28 if (dom == TOPO_SMT_DOMAIN) 29 return apicid; 30 return apicid >> x86_topo_system.dom_shifts[dom - 1]; 31 } 32 33 static inline u32 topo_relative_domain_id(u32 apicid, enum x86_topology_domains dom) 34 { 35 if (dom != TOPO_SMT_DOMAIN) 36 apicid >>= x86_topo_system.dom_shifts[dom - 1]; 37 return apicid & (x86_topo_system.dom_size[dom] - 1); 38 } 39 40 static inline u32 topo_domain_mask(enum x86_topology_domains dom) 41 { 42 return (1U << x86_topo_system.dom_shifts[dom]) - 1; 43 } 44 45 /* 46 * Update a domain level after the fact without propagating. Used to fixup 47 * broken CPUID enumerations. 48 */ 49 static inline void topology_update_dom(struct topo_scan *tscan, enum x86_topology_domains dom, 50 unsigned int shift, unsigned int ncpus) 51 { 52 tscan->dom_shifts[dom] = shift; 53 tscan->dom_ncpus[dom] = ncpus; 54 } 55 56 #ifdef CONFIG_X86_LOCAL_APIC 57 unsigned int topology_unit_count(u32 apicid, enum x86_topology_domains which_units, 58 enum x86_topology_domains at_level); 59 #else 60 static inline unsigned int topology_unit_count(u32 apicid, enum x86_topology_domains which_units, 61 enum x86_topology_domains at_level) 62 { 63 return 1; 64 } 65 #endif 66 67 #endif /* ARCH_X86_TOPOLOGY_H */ 68