x86/intel_rdt: Enumerate L2 Code and Data Prioritization (CDP) feature

L2 Code and Data Prioritization (CDP) is enumerated in
CPUID(EAX=0x10, ECX=0x2):ECX.bit2

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "Ravi V Shankar" <ravi.v.shankar@intel.com>
Cc: "Tony Luck" <tony.luck@intel.com>
Cc: Vikas" <vikas.shivappa@intel.com>
Cc: Sai Praneeth" <sai.praneeth.prakhya@intel.com>
Cc: Reinette" <reinette.chatre@intel.com>
Link: https://lkml.kernel.org/r/1513810644-78015-4-git-send-email-fenghua.yu@intel.com

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 25b9375..67bbfaa 100644 (file)
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -206,6 +206,7 @@
 #define X86_FEATURE_RETPOLINE          ( 7*32+12) /* Generic Retpoline mitigation for Spectre variant 2 */
 #define X86_FEATURE_RETPOLINE_AMD      ( 7*32+13) /* AMD Retpoline mitigation for Spectre variant 2 */
 #define X86_FEATURE_INTEL_PPIN         ( 7*32+14) /* Intel Processor Inventory Number */
+#define X86_FEATURE_CDP_L2             ( 7*32+15) /* Code and Data Prioritization L2 */
 #define X86_FEATURE_AVX512_4VNNIW      ( 7*32+16) /* AVX-512 Neural Network Instructions */
 #define X86_FEATURE_AVX512_4FMAPS      ( 7*32+17) /* AVX-512 Multiply Accumulation Single precision */
 

diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
index d0e6976..df4d8f7 100644 (file)
--- a/arch/x86/kernel/cpu/scattered.c
+++ b/arch/x86/kernel/cpu/scattered.c
@@ -26,6 +26,7 @@ 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_CDP_L2,           CPUID_ECX,  2, 0x00000010, 2 },
        { 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 },