Commit-ID: 3986a0a805e668a63fac0ca2cdfa8db951f87c4b Gitweb: https://git.kernel.org/tip/3986a0a805e668a63fac0ca2cdfa8db951f87c4b Author: Suravee Suthikulpanit <[email protected]> AuthorDate: Fri, 27 Apr 2018 16:48:01 -0500 Committer: Thomas Gleixner <[email protected]> CommitDate: Sun, 6 May 2018 12:49:16 +0200
x86/CPU/AMD: Derive CPU topology from CPUID function 0xB when available Derive topology information from Extended Topology Enumeration (CPUID function 0xB) when the information is available. Signed-off-by: Suravee Suthikulpanit <[email protected]> Signed-off-by: Borislav Petkov <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/[email protected] --- arch/x86/kernel/cpu/amd.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index bf27246bb7bd..55361ee04cc5 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -327,6 +327,7 @@ static void amd_get_topology(struct cpuinfo_x86 *c) /* get information required for multi-node processors */ if (boot_cpu_has(X86_FEATURE_TOPOEXT)) { + int err; u32 eax, ebx, ecx, edx; cpuid(0x8000001e, &eax, &ebx, &ecx, &edx); @@ -344,6 +345,14 @@ static void amd_get_topology(struct cpuinfo_x86 *c) c->x86_max_cores /= smp_num_siblings; } + /* + * In case leaf B is available, use it to derive + * topology information. + */ + err = detect_extended_topology(c); + if (!err) + c->x86_coreid_bits = get_count_order(c->x86_max_cores); + cacheinfo_amd_init_llc_id(c, cpu, node_id); } else if (cpu_has(c, X86_FEATURE_NODEID_MSR)) { @@ -378,7 +387,6 @@ static void amd_detect_cmp(struct cpuinfo_x86 *c) c->phys_proc_id = c->initial_apicid >> bits; /* use socket ID also for last level cache */ per_cpu(cpu_llc_id, cpu) = c->phys_proc_id; - amd_get_topology(c); } u16 amd_get_nb_id(int cpu) @@ -821,6 +829,7 @@ static void init_amd(struct cpuinfo_x86 *c) /* Multi core CPU? */ if (c->extended_cpuid_level >= 0x80000008) { amd_detect_cmp(c); + amd_get_topology(c); srat_detect_node(c); }
