diff options
| author | Andreas Herrmann <andreas.herrmann3@amd.com> | 2010-09-30 14:38:57 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-10-01 16:18:32 -0700 |
| commit | 6057b4d331f19a3ea51aec463ea7839c128b3227 (patch) | |
| tree | 0bcf33ac60389ab21781b565aaf5b5e8c0fa60d8 /arch/x86/kernel/cpu/amd.c | |
| parent | 23588c38a84c9175c6668789b64ffba4651e5c6a (diff) | |
x86, amd: Extract compute unit information for AMD CPUs
Get compute unit information from CPUID Fn8000_001E_EBX.
(See AMD CPUID Specification - publication # 25481, revision 2.34,
September 2010.)
Note that each core on a compute unit still has a core_id of its own.
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
LKML-Reference: <20100930123857.GE20545@loge.amd.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/cpu/amd.c')
| -rw-r--r-- | arch/x86/kernel/cpu/amd.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 7e6a37d2425..70168ab88b7 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -256,21 +256,29 @@ static int __cpuinit nearby_node(int apicid) * Fixup core topology information for * (1) AMD multi-node processors * Assumption: Number of cores in each internal node is the same. + * (2) AMD processors supporting compute units */ #ifdef CONFIG_X86_HT static void __cpuinit amd_get_topology(struct cpuinfo_x86 *c) { - u32 nodes, cores_per_node; + u32 nodes; u8 node_id; - unsigned long long value; int cpu = smp_processor_id(); /* get information required for multi-node processors */ if (cpu_has(c, X86_FEATURE_TOPOEXT)) { - value = cpuid_ecx(0x8000001e); - nodes = ((value >> 8) & 7) + 1; - node_id = value & 7; + u32 eax, ebx, ecx, edx; + + cpuid(0x8000001e, &eax, &ebx, &ecx, &edx); + nodes = ((ecx >> 8) & 7) + 1; + node_id = ecx & 7; + + /* get compute unit information */ + smp_num_siblings = ((ebx >> 8) & 3) + 1; + c->compute_unit_id = ebx & 0xff; } else if (cpu_has(c, X86_FEATURE_NODEID_MSR)) { + u64 value; + rdmsrl(MSR_FAM10H_NODE_ID, value); nodes = ((value >> 3) & 7) + 1; node_id = value & 7; @@ -279,6 +287,8 @@ static void __cpuinit amd_get_topology(struct cpuinfo_x86 *c) /* fixup multi-node processor information */ if (nodes > 1) { + u32 cores_per_node; + set_cpu_cap(c, X86_FEATURE_AMD_DCM); cores_per_node = c->x86_max_cores / nodes; |