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Commit f048c399 authored Jun 21, 2018 by Thomas Gleixner

x86/topology: Provide topology_smt_supported()



Provide information whether SMT is supoorted by the CPUs. Preparatory patch
for SMT control mechanism.

Suggested-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@kernel.org>

parent 6a4d2657

arch/x86/include/asm/topology.h

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -125,6 +125,7 @@ static inline int topology_max_smt_threads(void)
	int topology_update_package_map(unsigned int apicid, unsigned int cpu);		int topology_update_package_map(unsigned int apicid, unsigned int cpu);
	int topology_phys_to_logical_pkg(unsigned int pkg);		int topology_phys_to_logical_pkg(unsigned int pkg);
	bool topology_is_primary_thread(unsigned int cpu);		bool topology_is_primary_thread(unsigned int cpu);
			bool topology_smt_supported(void);
	#else		#else
	#define topology_max_packages() (1)		#define topology_max_packages() (1)
	static inline int		static inline int
	@@ -132,6 +133,7 @@ topology_update_package_map(unsigned int apicid, unsigned int cpu) { return 0; }
	static inline int topology_phys_to_logical_pkg(unsigned int pkg) { return 0; }		static inline int topology_phys_to_logical_pkg(unsigned int pkg) { return 0; }
	static inline int topology_max_smt_threads(void) { return 1; }		static inline int topology_max_smt_threads(void) { return 1; }
	static inline bool topology_is_primary_thread(unsigned int cpu) { return true; }		static inline bool topology_is_primary_thread(unsigned int cpu) { return true; }
			static inline bool topology_smt_supported(void) { return false; }
	#endif		#endif

	static inline void arch_fix_phys_package_id(int num, u32 slot)		static inline void arch_fix_phys_package_id(int num, u32 slot)

arch/x86/kernel/smpboot.c

+8 −0

Original line number	Original line	Diff line number	Diff line
	@@ -274,6 +274,14 @@ bool topology_is_primary_thread(unsigned int cpu)
	return apic_id_is_primary_thread(per_cpu(x86_cpu_to_apicid, cpu));		return apic_id_is_primary_thread(per_cpu(x86_cpu_to_apicid, cpu));
	}		}

			/**
			* topology_smt_supported - Check whether SMT is supported by the CPUs
			*/
			bool topology_smt_supported(void)
			{
			return smp_num_siblings > 1;
			}

	/**		/**
	* topology_phys_to_logical_pkg - Map a physical package id to a logical		* topology_phys_to_logical_pkg - Map a physical package id to a logical
	*		*