diff options
Diffstat (limited to 'include/linux/arch_topology.h')
| -rw-r--r-- | include/linux/arch_topology.h | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h index d72d6e5aa200..ebd7f8935f96 100644 --- a/include/linux/arch_topology.h +++ b/include/linux/arch_topology.h @@ -80,6 +80,11 @@ extern struct cpu_topology cpu_topology[NR_CPUS]; #define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling) #define topology_cluster_cpumask(cpu) (&cpu_topology[cpu].cluster_sibling) #define topology_llc_cpumask(cpu) (&cpu_topology[cpu].llc_sibling) + +#ifndef arch_cpu_is_threaded +#define arch_cpu_is_threaded() (0) +#endif + void init_cpu_topology(void); void store_cpu_topology(unsigned int cpuid); const struct cpumask *cpu_coregroup_mask(int cpu); @@ -89,6 +94,21 @@ void remove_cpu_topology(unsigned int cpuid); void reset_cpu_topology(void); int parse_acpi_topology(void); void freq_inv_set_max_ratio(int cpu, u64 max_rate); -#endif + +/* + * Architectures like ARM64 don't have reliable architectural way to get SMT + * information and depend on the firmware (ACPI/OF) report. Non-SMT core won't + * initialize thread_id so we can use this to detect the SMT implementation. + */ +static inline bool topology_core_has_smt(int cpu) +{ + return cpu_topology[cpu].thread_id != -1; +} + +#else + +static inline bool topology_core_has_smt(int cpu) { return false; } + +#endif /* CONFIG_GENERIC_ARCH_TOPOLOGY */ #endif /* _LINUX_ARCH_TOPOLOGY_H_ */ |