[ck] [patch v1 6/6] ck: x86/cpu: Add detect extended topology for Zhaoxin CPUs

Detect the extended topology information of Zhaoxin CPUs if available. The patch is scheduled to be submitted to the kernel mainline in 2021. Signed-off-by: LeoLiu-oc &lt;LeoLiu-oc(a)zhaoxin.com&gt; --- arch/x86/kernel/cpu/centaur.c | 20 +++++++++++++++++++- arch/x86/kernel/cpu/zhaoxin.c | 7 ++++++- 2 files changed, 25 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/centaur.c b/arch/x86/kernel/cpu/centaur.c index 8735be464bc1..49b33cc78751 100644 --- a/arch/x86/kernel/cpu/centaur.c +++ b/arch/x86/kernel/cpu/centaur.c @@ -115,6 +115,21 @@ static void early_init_centaur(struct cpuinfo_x86 *c) set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC); set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC); } + + if (c->cpuid_level >= 0x00000001) { + u32 eax, ebx, ecx, edx; + + cpuid(0x00000001, &eax, &ebx, &ecx, &edx); + /* + * If HTT (EDX[28]) is set EBX[16:23] contain the number of + * apicids which are reserved per package. Store the resulting + * shift value for the package management code. + */ + if (edx & (1U << 28)) + c->x86_coreid_bits = get_count_order((ebx >> 16) & 0xff); + } + if (detect_extended_topology_early(c) < 0) + detect_ht_early(c); } static void centaur_detect_vmx_virtcap(struct cpuinfo_x86 *c) @@ -158,8 +173,11 @@ static void init_centaur(struct cpuinfo_x86 *c) clear_cpu_cap(c, 0*32+31); #endif early_init_centaur(c); + detect_extended_topology(c); init_intel_cacheinfo(c); - detect_num_cpu_cores(c); + if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) + detect_num_cpu_cores(c); + #ifdef CONFIG_X86_32 detect_ht(c); #endif diff --git a/arch/x86/kernel/cpu/zhaoxin.c b/arch/x86/kernel/cpu/zhaoxin.c index 452fd0a6bc61..b6fc969b3e74 100644 --- a/arch/x86/kernel/cpu/zhaoxin.c +++ b/arch/x86/kernel/cpu/zhaoxin.c @@ -85,6 +85,8 @@ static void early_init_zhaoxin(struct cpuinfo_x86 *c) c->x86_coreid_bits = get_count_order((ebx >> 16) & 0xff); } + if (detect_extended_topology_early(c) < 0) + detect_ht_early(c); } static void zhaoxin_detect_vmx_virtcap(struct cpuinfo_x86 *c) @@ -115,8 +117,11 @@ static void zhaoxin_detect_vmx_virtcap(struct cpuinfo_x86 *c) static void init_zhaoxin(struct cpuinfo_x86 *c) { early_init_zhaoxin(c); + detect_extended_topology(c); init_intel_cacheinfo(c); - detect_num_cpu_cores(c); + if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) + detect_num_cpu_cores(c); + #ifdef CONFIG_X86_32 detect_ht(c); #endif -- 2.20.1