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x86: Add cpu_has_topoext

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Introduce cpu_has_topoext to check for AMD's CPUID topology extensions
support. It indicates support for
CPUID Fn8000_001D_EAX_x[N:0]-CPUID Fn8000_001E_EDX

See AMD's CPUID Specification, Publication # 25481
(as of Rev. 2.34 September 2010)

Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Link: http://lkml.kernel.org/r/20121019085813.GD26718@alberich
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Andreas Herrmann 2012-10-19 10:58:13 +02:00 committed by H. Peter Anvin
parent 77b67063bb
commit 193f3fcb3a
3 changed files with 3 additions and 2 deletions
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1
arch/x86/include/asm/cpufeature.h
View file

@ -311,6 +311,7 @@ extern const char * const x86_power_flags[32];
#define cpu_has_cx8 boot_cpu_has(X86_FEATURE_CX8)
#define cpu_has_cx16 boot_cpu_has(X86_FEATURE_CX16)
#define cpu_has_eager_fpu boot_cpu_has(X86_FEATURE_EAGER_FPU)
#define cpu_has_topoext boot_cpu_has(X86_FEATURE_TOPOEXT)
#if defined(CONFIG_X86_INVLPG) || defined(CONFIG_X86_64)
# define cpu_has_invlpg 1

2
arch/x86/kernel/cpu/amd.c
View file

@ -304,7 +304,7 @@ static void __cpuinit amd_get_topology(struct cpuinfo_x86 *c)
int cpu = smp_processor_id();
/* get information required for multi-node processors */
if (cpu_has(c, X86_FEATURE_TOPOEXT)) {
if (cpu_has_topoext) {
u32 eax, ebx, ecx, edx;
cpuid(0x8000001e, &eax, &ebx, &ecx, &edx);

2
arch/x86/kernel/smpboot.c
View file

@ -313,7 +313,7 @@ do { \
static bool __cpuinit match_smt(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
{
if (cpu_has(c, X86_FEATURE_TOPOEXT)) {
if (cpu_has_topoext) {
int cpu1 = c->cpu_index, cpu2 = o->cpu_index;
if (c->phys_proc_id == o->phys_proc_id &&