From: Vikas Shivappa <vikas.shivappa@linux.intel.com>
To: vikas.shivappa@intel.com, x86@kernel.org, linux-kernel@vger.kernel.org
Cc: hpa@zytor.com, tglx@linutronix.de, mingo@kernel.org,
ravi.v.shankar@intel.com, tony.luck@intel.com,
fenghua.yu@intel.com, vikas.shivappa@linux.intel.com
Subject: [PATCH 3/8] x86/intel_rdt/mba: Memory b/w allocation feature detect
Date: Fri, 7 Apr 2017 17:33:52 -0700 [thread overview]
Message-ID: <1491611637-20417-4-git-send-email-vikas.shivappa@linux.intel.com> (raw)
In-Reply-To: <1491611637-20417-1-git-send-email-vikas.shivappa@linux.intel.com>
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>
---
arch/x86/include/asm/cpufeatures.h | 2 ++
arch/x86/include/asm/intel_rdt.h | 8 ++++++++
arch/x86/kernel/cpu/intel_rdt.c | 3 +++
arch/x86/kernel/cpu/scattered.c | 1 +
4 files changed, 14 insertions(+)
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index b04bb6d..25d7f52 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -201,6 +201,8 @@
#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 */
+#define X86_FEATURE_MBA ( 7*32+18) /* Memory Bandwidth Allocation */
+
/* Virtualization flags: Linux defined, word 8 */
#define X86_FEATURE_TPR_SHADOW ( 8*32+ 0) /* Intel TPR Shadow */
#define X86_FEATURE_VNMI ( 8*32+ 1) /* Intel Virtual NMI */
diff --git a/arch/x86/include/asm/intel_rdt.h b/arch/x86/include/asm/intel_rdt.h
index 2add1a7..4c94f18 100644
--- a/arch/x86/include/asm/intel_rdt.h
+++ b/arch/x86/include/asm/intel_rdt.h
@@ -167,6 +167,14 @@ enum {
unsigned int full;
};
+/* CPUID.(EAX=10H, ECX=ResID=3).EAX */
+union cpuid_0x10_3_eax {
+ struct {
+ unsigned int max_delay:12;
+ } split;
+ unsigned int full;
+};
+
/* CPUID.(EAX=10H, ECX=ResID).EDX */
union cpuid_0x10_x_edx {
struct {
diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index 6507e93..c4cf2e8 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -212,6 +212,9 @@ static inline bool get_rdt_resources(void)
ret = true;
}
+ if (boot_cpu_has(X86_FEATURE_MBA))
+ ret = true;
+
rdt_init_padding();
return ret;
diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
index d979406..23c2350 100644
--- a/arch/x86/kernel/cpu/scattered.c
+++ b/arch/x86/kernel/cpu/scattered.c
@@ -27,6 +27,7 @@ struct cpuid_bit {
{ 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 },
--
1.9.1
next prev parent reply other threads:[~2017-04-08 0:34 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-08 0:33 [PATCH 0/8 V4] x86/intel_rdt: Intel Memory bandwidth allocation Vikas Shivappa
2017-04-08 0:33 ` [PATCH 1/8] Documentation, x86: " Vikas Shivappa
2017-04-14 14:17 ` [tip:x86/cpu] " tip-bot for Vikas Shivappa
2017-04-08 0:33 ` [PATCH 2/8] x86/intel_rdt/mba: Generalize the naming to get ready for MBA Vikas Shivappa
2017-04-14 14:17 ` [tip:x86/cpu] x86/intel_rdt: Cleanup namespace to support multiple resource types tip-bot for Vikas Shivappa
2017-04-08 0:33 ` Vikas Shivappa [this message]
2017-04-14 14:19 ` [tip:x86/cpu] x86/intel_rdt/mba: Memory bandwith allocation feature detect tip-bot for Vikas Shivappa
2017-04-08 0:33 ` [PATCH 4/8] x86/intel_rct/mba: Add MBA structures and initialize MBA Vikas Shivappa
2017-04-14 14:19 ` [tip:x86/cpu] x86/intel_rdt/mba: Add primary support for Memory Bandwidth Allocation (MBA) tip-bot for Vikas Shivappa
2017-04-08 0:33 ` [PATCH 5/8] x86/intel_rdt: Prep to add info files for MBA Vikas Shivappa
2017-04-14 14:20 ` [tip:x86/cpu] x86/intel_rdt: Make information files resource specific tip-bot for Vikas Shivappa
2017-04-08 0:33 ` [PATCH 6/8] x86/intel_rdt/mba: Add info directory files for MBA Vikas Shivappa
2017-04-14 14:20 ` [tip:x86/cpu] x86/intel_rdt/mba: Add info directory files for Memory Bandwidth Allocation tip-bot for Vikas Shivappa
2017-04-08 0:33 ` [PATCH 7/8] x86/intel_rdt: Prep to add schemata file for MBA Vikas Shivappa
2017-04-14 14:21 ` [tip:x86/cpu] x86/intel_rdt: Make schemata file parsers resource specific tip-bot for Vikas Shivappa
2017-04-08 0:33 ` [PATCH 8/8] x86/intel_rdt/mba: Add schemata file support for MBA Vikas Shivappa
2017-04-14 14:21 ` [tip:x86/cpu] " tip-bot for Vikas Shivappa
2017-04-12 22:59 ` [PATCH 0/8 V4] x86/intel_rdt: Intel Memory bandwidth allocation Shivappa Vikas
2017-04-12 23:33 ` Thomas Gleixner
2017-04-14 14:29 ` Thomas Gleixner
2017-04-14 17:52 ` Shivappa Vikas
2017-04-15 0:20 ` Shivappa Vikas
-- strict thread matches above, loose matches on Subject: below --
2017-04-03 21:57 [PATCH 0/8 V3] " Vikas Shivappa
2017-04-03 21:57 ` [PATCH 3/8] x86/intel_rdt/mba: Memory b/w allocation feature detect Vikas Shivappa
2017-02-17 19:58 [PATCH 0/8 V2] x86/intel_rdt: Intel Memory bandwidth allocation Vikas Shivappa
2017-02-17 19:58 ` [PATCH 3/8] x86/intel_rdt/mba: Memory b/w allocation feature detect Vikas Shivappa
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