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x86/intel_rdt/mba: Memory bandwith allocation feature detect

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Detect MBA feature if CPUID.(EAX=10H, ECX=0):EBX.L2[bit 3] = 1.
Add supporting data structures to detect feature details which is done
in later patch using CPUID with EAX=10H, ECX= 3.

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Cc: ravi.v.shankar@intel.com
Cc: tony.luck@intel.com
Cc: fenghua.yu@intel.com
Cc: vikas.shivappa@intel.com
Link: http://lkml.kernel.org/r/1491611637-20417-4-git-send-email-vikas.shivappa@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Vikas Shivappa
2017-04-07 17:33:52 -07:00
committed by Thomas Gleixner
parent 0921c54769
commit ab66a33b03
4 changed files with 15 additions and 0 deletions
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4
arch/x86/kernel/cpu/intel_rdt.c
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@@ -430,6 +430,10 @@ static __init bool get_rdt_resources(void)
rdt_get_cache_config(2, &rdt_resources_all[RDT_RESOURCE_L2]);
ret = true;
}
if (boot_cpu_has(X86_FEATURE_MBA))
ret = true;
return ret;
}

1
arch/x86/kernel/cpu/scattered.c
View File

@@ -27,6 +27,7 @@ static const struct cpuid_bit cpuid_bits[] = {
{ X86_FEATURE_CAT_L3, CPUID_EBX, 1, 0x00000010, 0 },
{ X86_FEATURE_CAT_L2, CPUID_EBX, 2, 0x00000010, 0 },
{ X86_FEATURE_CDP_L3, CPUID_ECX, 2, 0x00000010, 1 },
{ X86_FEATURE_MBA, CPUID_EBX, 3, 0x00000010, 0 },
{ X86_FEATURE_HW_PSTATE, CPUID_EDX, 7, 0x80000007, 0 },
{ X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 },
{ X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 },