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Subject[PATCH v4 06/18] x86/intel_rdt: Add CONFIG, Makefile, and basic initialization
Date
From: Fenghua Yu <fenghua.yu@intel.com>

Introduce CONFIG_INTEL_RDT_A (default: no, dependent on X86 and
CPU_SUP_INTEL) to control inclusion of Resource Director Technology in
the build.

Simple init() routine just checks which features are present. If they are
pr_info() one line summary for each feature.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---
arch/x86/Kconfig | 12 +++++++++
arch/x86/kernel/cpu/Makefile | 2 ++
arch/x86/kernel/cpu/intel_rdt.c | 54 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 68 insertions(+)
create mode 100644 arch/x86/kernel/cpu/intel_rdt.c

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 2a1f0ce..b245fcb 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -406,6 +406,18 @@ config GOLDFISH
def_bool y
depends on X86_GOLDFISH

+config INTEL_RDT_A
+ bool "Intel Resource Director Technology Allocation support"
+ default n
+ depends on X86 && CPU_SUP_INTEL
+ help
+ Select to enable resource allocation which is a sub-feature of
+ Intel Resource Director Technology(RDT). More information about
+ RDT can be found in the Intel x86 Architecture Software
+ Developer Manual June 2016, volume 3, section 17.17.
+
+ Say N if unsure.
+
if X86_32
config X86_EXTENDED_PLATFORM
bool "Support for extended (non-PC) x86 platforms"
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 4a8697f..cf4bfd0 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -34,6 +34,8 @@ obj-$(CONFIG_CPU_SUP_CENTAUR) += centaur.o
obj-$(CONFIG_CPU_SUP_TRANSMETA_32) += transmeta.o
obj-$(CONFIG_CPU_SUP_UMC_32) += umc.o

+obj-$(CONFIG_INTEL_RDT_A) += intel_rdt.o
+
obj-$(CONFIG_X86_MCE) += mcheck/
obj-$(CONFIG_MTRR) += mtrr/
obj-$(CONFIG_MICROCODE) += microcode/
diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
new file mode 100644
index 0000000..7d7aebe
--- /dev/null
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -0,0 +1,54 @@
+/*
+ * Resource Director Technology(RDT)
+ * - Cache Allocation code.
+ *
+ * Copyright (C) 2016 Intel Corporation
+ *
+ * Authors:
+ * Fenghua Yu <fenghua.yu@intel.com>
+ * Tony Luck <tony.luck@intel.com>
+ * Vikas Shivappa <vikas.shivappa@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * More information about RDT be found in the Intel (R) x86 Architecture
+ * Software Developer Manual June 2016, volume 3, section 17.17.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/slab.h>
+#include <linux/err.h>
+
+static inline bool get_rdt_resources(void)
+{
+ bool ret = false;
+
+ if (!boot_cpu_has(X86_FEATURE_RDT_A))
+ return false;
+ if (boot_cpu_has(X86_FEATURE_CAT_L3))
+ ret = true;
+
+ return ret;
+}
+
+static int __init intel_rdt_late_init(void)
+{
+ if (!get_rdt_resources())
+ return -ENODEV;
+
+ pr_info("Intel RDT cache allocation detected\n");
+ if (boot_cpu_has(X86_FEATURE_CDP_L3))
+ pr_info("Intel RDT code data prioritization detected\n");
+
+ return 0;
+}
+
+late_initcall(intel_rdt_late_init);
--
2.5.0
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