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Subject[PATCH 1/5] x86, cacheinfo: Unify AMD L3 cache index disable checking
Date
From: Borislav Petkov <borislav.petkov@amd.com>

All F10h CPUs starting with model 8 resp. 9, stepping 1, support L3
cache index disable. Concentrate the family, model, stepping checking at
one place and enable the feature implicitly on upcoming Fam10h models.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
---
arch/x86/kernel/cpu/intel_cacheinfo.c | 17 ++++++++++-------
1 files changed, 10 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index b3eeb66..acfb083 100644
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -328,18 +328,22 @@ static unsigned int __cpuinit amd_calc_l3_indices(void)
static void __cpuinit
amd_check_l3_disable(int index, struct _cpuid4_info_regs *this_leaf)
{
- if (index < 3)
+ if (boot_cpu_data.x86 != 0x10)
return;

- if (boot_cpu_data.x86 == 0x11)
+ if (index < 3)
return;

/* see errata #382 and #388 */
- if ((boot_cpu_data.x86 == 0x10) &&
- ((boot_cpu_data.x86_model < 0x8) ||
- (boot_cpu_data.x86_mask < 0x1)))
+ if (boot_cpu_data.x86_model < 0x8)
return;

+ if ((boot_cpu_data.x86_model == 0x8 ||
+ boot_cpu_data.x86_model == 0x9)
+ &&
+ boot_cpu_data.x86_mask < 0x1)
+ return;
+
this_leaf->can_disable = true;
this_leaf->l3_indices = amd_calc_l3_indices();
}
@@ -443,8 +447,7 @@ __cpuinit cpuid4_cache_lookup_regs(int index,

if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
amd_cpuid4(index, &eax, &ebx, &ecx);
- if (boot_cpu_data.x86 >= 0x10)
- amd_check_l3_disable(index, this_leaf);
+ amd_check_l3_disable(index, this_leaf);
} else {
cpuid_count(4, index, &eax.full, &ebx.full, &ecx.full, &edx);
}
--
1.7.1.rc1


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