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x86/cpu/intel: Define helper to get CPU core native ID

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Define helper get_this_hybrid_cpu_native_id() to return the CPU core
native ID. This core native ID combining with core type can be used to
figure out the CPU core uarch uniquely.

Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Tested-by: Yongwei Ma <yongwei.ma@intel.com>
Link: https://lkml.kernel.org/r/20240820073853.1974746-3-dapeng1.mi@linux.intel.com
This commit is contained in:
Dapeng Mi 2024-08-20 07:38:51 +00:00 committed by Peter Zijlstra
parent 79390db9eb
commit 2eb2802a41
2 changed files with 21 additions and 0 deletions
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6
arch/x86/include/asm/cpu.h
View File

@ -32,6 +32,7 @@ extern bool handle_user_split_lock(struct pt_regs *regs, long error_code);
extern bool handle_guest_split_lock(unsigned long ip);
extern void handle_bus_lock(struct pt_regs *regs);
u8 get_this_hybrid_cpu_type(void);
u32 get_this_hybrid_cpu_native_id(void);
#else
static inline void __init sld_setup(struct cpuinfo_x86 *c) {}
static inline bool handle_user_split_lock(struct pt_regs *regs, long error_code)
@ -50,6 +51,11 @@ static inline u8 get_this_hybrid_cpu_type(void)
{
return 0;
}
static inline u32 get_this_hybrid_cpu_native_id(void)
{
return 0;
}
#endif
#ifdef CONFIG_IA32_FEAT_CTL
void init_ia32_feat_ctl(struct cpuinfo_x86 *c);

15
arch/x86/kernel/cpu/intel.c
View File

@ -1299,3 +1299,18 @@ u8 get_this_hybrid_cpu_type(void)
return cpuid_eax(0x0000001a) >> X86_HYBRID_CPU_TYPE_ID_SHIFT;
}
/**
* get_this_hybrid_cpu_native_id() - Get the native id of this hybrid CPU
*
* Returns the uarch native ID [23:0] of a CPU in a hybrid processor.
* If the processor is not hybrid, returns 0.
*/
u32 get_this_hybrid_cpu_native_id(void)
{
if (!cpu_feature_enabled(X86_FEATURE_HYBRID_CPU))
return 0;
return cpuid_eax(0x0000001a) &
(BIT_ULL(X86_HYBRID_CPU_TYPE_ID_SHIFT) - 1);
}