x86/cpufeature: Add RDT CPUID feature bits
authorFenghua Yu <fenghua.yu@intel.com>
Sat, 22 Oct 2016 13:19:51 +0000 (06:19 -0700)
committerThomas Gleixner <tglx@linutronix.de>
Wed, 26 Oct 2016 21:12:38 +0000 (23:12 +0200)
Check CPUID leaves for all the Resource Director Technology (RDT)
Cache Allocation Technology (CAT) bits.

Presence of allocation features:
  CPUID.(EAX=7H, ECX=0):EBX[bit 15] X86_FEATURE_RDT_A

L2 and L3 caches are each separately enabled:
  CPUID.(EAX=10H, ECX=0):EBX[bit 1] X86_FEATURE_CAT_L3
  CPUID.(EAX=10H, ECX=0):EBX[bit 2] X86_FEATURE_CAT_L2

L3 cache may support independent control of allocation for
code and data (CDP = Code/Data Prioritization):
  CPUID.(EAX=10H, ECX=1):ECX[bit 2] X86_FEATURE_CDP_L3

[ tglx: Fixed up Borislavs comments and moved the feature bits into a gap ]

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Acked-by: "Borislav Petkov" <bp@suse.de>
Cc: "Ravi V Shankar" <ravi.v.shankar@intel.com>
Cc: "Tony Luck" <tony.luck@intel.com>
Cc: "David Carrillo-Cisneros" <davidcc@google.com>
Cc: "Sai Prakhya" <sai.praneeth.prakhya@intel.com>
Cc: "Peter Zijlstra" <peterz@infradead.org>
Cc: "Stephane Eranian" <eranian@google.com>
Cc: "Dave Hansen" <dave.hansen@intel.com>
Cc: "Shaohua Li" <shli@fb.com>
Cc: "Nilay Vaish" <nilayvaish@gmail.com>
Cc: "Vikas Shivappa" <vikas.shivappa@linux.intel.com>
Cc: "Ingo Molnar" <mingo@elte.hu>
Cc: "H. Peter Anvin" <h.peter.anvin@intel.com>
Link: http://lkml.kernel.org/r/1477142405-32078-5-git-send-email-fenghua.yu@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
arch/x86/include/asm/cpufeatures.h
arch/x86/kernel/cpu/scattered.c

index a39629206864e5bb74aaddea15ca1ab762877042..90b8c0b185c30f13ba3b6015b13f50c92a4e0df7 100644 (file)
 
 #define X86_FEATURE_CPB                ( 7*32+ 2) /* AMD Core Performance Boost */
 #define X86_FEATURE_EPB                ( 7*32+ 3) /* IA32_ENERGY_PERF_BIAS support */
+#define X86_FEATURE_CAT_L3     ( 7*32+ 4) /* Cache Allocation Technology L3 */
+#define X86_FEATURE_CAT_L2     ( 7*32+ 5) /* Cache Allocation Technology L2 */
+#define X86_FEATURE_CDP_L3     ( 7*32+ 6) /* Code and Data Prioritization L3 */
 
 #define X86_FEATURE_HW_PSTATE  ( 7*32+ 8) /* AMD HW-PState */
 #define X86_FEATURE_PROC_FEEDBACK ( 7*32+ 9) /* AMD ProcFeedbackInterface */
 #define X86_FEATURE_RTM                ( 9*32+11) /* Restricted Transactional Memory */
 #define X86_FEATURE_CQM                ( 9*32+12) /* Cache QoS Monitoring */
 #define X86_FEATURE_MPX                ( 9*32+14) /* Memory Protection Extension */
+#define X86_FEATURE_RDT_A      ( 9*32+15) /* Resource Director Technology Allocation */
 #define X86_FEATURE_AVX512F    ( 9*32+16) /* AVX-512 Foundation */
 #define X86_FEATURE_AVX512DQ   ( 9*32+17) /* AVX-512 DQ (Double/Quad granular) Instructions */
 #define X86_FEATURE_RDSEED     ( 9*32+18) /* The RDSEED instruction */
index 1db8dc490b665e751f43f3411cc21079eea75ae2..49fb680bb0e50f7154bc870b9e78d4c2c29285c1 100644 (file)
@@ -36,6 +36,9 @@ void init_scattered_cpuid_features(struct cpuinfo_x86 *c)
                { X86_FEATURE_AVX512_4FMAPS,    CR_EDX, 3, 0x00000007, 0 },
                { X86_FEATURE_APERFMPERF,       CR_ECX, 0, 0x00000006, 0 },
                { X86_FEATURE_EPB,              CR_ECX, 3, 0x00000006, 0 },
+               { X86_FEATURE_CAT_L3,           CR_EBX, 1, 0x00000010, 0 },
+               { X86_FEATURE_CAT_L2,           CR_EBX, 2, 0x00000010, 0 },
+               { X86_FEATURE_CDP_L3,           CR_ECX, 2, 0x00000010, 1 },
                { X86_FEATURE_HW_PSTATE,        CR_EDX, 7, 0x80000007, 0 },
                { X86_FEATURE_CPB,              CR_EDX, 9, 0x80000007, 0 },
                { X86_FEATURE_PROC_FEEDBACK,    CR_EDX,11, 0x80000007, 0 },