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x86/topology: Provide topology_smt_supported()

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commit f048c399e0 upstream

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>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Gleixner
2018-06-21 10:37:20 +02:00
committed by Greg Kroah-Hartman
parent 7b69a96e5a
commit 16fd33cd35
2 changed files with 10 additions and 0 deletions
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2
arch/x86/include/asm/topology.h
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@@ -131,6 +131,7 @@ 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
@@ -138,6 +139,7 @@ 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)

8
arch/x86/kernel/smpboot.c
View File

@@ -304,6 +304,14 @@ 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
*