arch/x86/kernel/cpu/topology.h

   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 */