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x86/topology: Provide topology_smt_supported()

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

Suggested-by: Dave Hansen <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
This commit is contained in:
Thomas Gleixner committed 2018-06-21 14:20:57 +02:00
1 parent 6a4d2657e0
commit f048c399e0
2 files changed
+10
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arch/x86/include/asm/topology.h
+2
View File
@@ -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_phys_to_logical_pkg(unsigned int pkg);
bool topology_is_primary_thread(unsigned int cpu);
bool topology_smt_supported(void);
#else
#define topology_max_packages() (1)
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_max_smt_threads(void) { return 1; }
static inline bool topology_is_primary_thread(unsigned int cpu) { return true; }
static inline bool topology_smt_supported(void) { return false; }
#endif
static inline void arch_fix_phys_package_id(int num, u32 slot)
arch/x86/kernel/smpboot.c
+8
View File
@@ -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));
}
/**
* 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
*