linux-kernel - [PATCH 3/4] x86, cacheinfo: Make use of CPUID 0x8000001d for cache information on AMD

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Message-ID: <20121019090049.GF26718@alberich>
Date:	Fri, 19 Oct 2012 11:00:49 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	<x86@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/4] x86, cacheinfo: Make use of CPUID 0x8000001d for cache
 information on AMD


Rely on CPUID 0x8000001d for cache information when AMD CPUID topology
extensions are available.

Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
---
 arch/x86/kernel/cpu/intel_cacheinfo.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index 8ce7a83..cd2e1cc 100644
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -538,7 +538,11 @@ __cpuinit cpuid4_cache_lookup_regs(int index,
 	unsigned		edx;
 
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
-		amd_cpuid4(index, &eax, &ebx, &ecx);
+		if (cpu_has_topoext)
+			cpuid_count(0x8000001d, index, &eax.full,
+				    &ebx.full, &ecx.full, &edx);
+		else
+			amd_cpuid4(index, &eax, &ebx, &ecx);
 		amd_init_l3_cache(this_leaf, index);
 	} else {
 		cpuid_count(4, index, &eax.full, &ebx.full, &ecx.full, &edx);
-- 
1.7.8.6


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