Commit 78e99b4a authored by Fenghua Yu's avatar Fenghua Yu Committed by Thomas Gleixner

x86/intel_rdt: Add CONFIG, Makefile, and basic initialization

Introduce CONFIG_INTEL_RDT_A (default: no, dependent on 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 for now.
Signed-off-by: default avatarFenghua Yu <fenghua.yu@intel.com>
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: "Borislav Petkov" <bp@suse.de>
Cc: "H. Peter Anvin" <h.peter.anvin@intel.com>
Link: http://lkml.kernel.org/r/1477142405-32078-7-git-send-email-fenghua.yu@intel.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 4ab15864
......@@ -407,6 +407,18 @@ 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.
Say N if unsure.
if X86_32
config X86_EXTENDED_PLATFORM
bool "Support for extended (non-PC) x86 platforms"
......
......@@ -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/
......
/*
* 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);
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