From: "Fenghua Yu" <fenghua.yu@intel.com>
To: "Thomas Gleixner" <tglx@linutronix.de>
Cc: "H. Peter Anvin" <h.peter.anvin@intel.com>,
"Ingo Molnar" <mingo@elte.hu>, "Tony Luck" <tony.luck@intel.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Stephane Eranian" <eranian@google.com>,
"Borislav Petkov" <bp@suse.de>,
"Dave Hansen" <dave.hansen@intel.com>,
"Nilay Vaish" <nilayvaish@gmail.com>, "Shaohua Li" <shli@fb.com>,
"David Carrillo-Cisneros" <davidcc@google.com>,
"Ravi V Shankar" <ravi.v.shankar@intel.com>,
"Sai Prakhya" <sai.praneeth.prakhya@intel.com>,
"Vikas Shivappa" <vikas.shivappa@linux.intel.com>,
"linux-kernel" <linux-kernel@vger.kernel.org>,
"x86" <x86@kernel.org>, "Fenghua Yu" <fenghua.yu@intel.com>
Subject: [PATCH v3 06/18] x86/intel_rdt: Add CONFIG, Makefile, and basic initialization
Date: Fri, 7 Oct 2016 19:45:51 -0700 [thread overview]
Message-ID: <1475894763-64683-7-git-send-email-fenghua.yu@intel.com> (raw)
In-Reply-To: <1475894763-64683-1-git-send-email-fenghua.yu@intel.com>
From: Fenghua Yu <fenghua.yu@intel.com>
Introduce CONFIG_INTEL_RDT (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 | 56 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 70 insertions(+)
create mode 100644 arch/x86/kernel/cpu/intel_rdt.c
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 2a1f0ce..cfca613 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
+ bool "Intel Resource Director Technology 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..5a791c8 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) += 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..ebe8dae
--- /dev/null
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -0,0 +1,56 @@
+/*
+ * 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(struct cpuinfo_x86 *c)
+{
+ bool ret = false;
+
+ if (!cpu_has(c, X86_FEATURE_RDT_A))
+ return false;
+ if (cpu_has(c, X86_FEATURE_CAT_L3))
+ ret = true;
+
+ return ret;
+}
+
+static int __init intel_rdt_late_init(void)
+{
+ struct cpuinfo_x86 *c = &boot_cpu_data;
+
+ if (!get_rdt_resources(c))
+ return -ENODEV;
+
+ pr_info("Intel cache allocation detected\n");
+ if (cpu_has(c, X86_FEATURE_CDP_L3))
+ pr_info("Intel code data prioritization detected\n");
+
+ return 0;
+}
+
+late_initcall(intel_rdt_late_init);
--
2.5.0
next prev parent reply other threads:[~2016-10-07 23:47 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-08 2:45 [PATCH v3 00/18] Intel Cache Allocation Technology Fenghua Yu
2016-10-07 23:54 ` [RFC PATCH 19/18] x86/intel_rdt: Add support for L2 cache allocation Luck, Tony
2016-10-08 2:45 ` [PATCH v3 01/18] Documentation, ABI: Add a document entry for cache id Fenghua Yu
2016-10-08 17:11 ` Nilay Vaish
2016-10-10 16:45 ` Luck, Tony
2016-10-11 16:48 ` Nilay Vaish
2016-10-08 2:45 ` [PATCH v3 02/18] cacheinfo: Introduce " Fenghua Yu
2016-10-08 17:10 ` Nilay Vaish
2016-10-08 2:45 ` [PATCH v3 03/18] x86, intel_cacheinfo: Enable cache id in x86 Fenghua Yu
2016-10-08 2:45 ` [PATCH v3 04/18] x86/intel_rdt: Feature discovery Fenghua Yu
2016-10-08 17:11 ` Nilay Vaish
2016-10-08 20:54 ` Fenghua Yu
2016-10-08 19:52 ` Borislav Petkov
2016-10-11 16:57 ` Nilay Vaish
2016-10-11 17:03 ` Borislav Petkov
2016-10-10 16:01 ` Dave Hansen
2016-10-10 16:18 ` Borislav Petkov
2016-10-08 2:45 ` [PATCH v3 05/18] Documentation, x86: Documentation for Intel resource allocation user interface Fenghua Yu
2016-10-08 17:12 ` Nilay Vaish
2016-10-08 20:33 ` Fenghua Yu
2016-10-10 17:19 ` Luck, Tony
2016-10-11 17:07 ` Nilay Vaish
2016-10-11 18:04 ` Luck, Tony
2016-10-08 2:45 ` Fenghua Yu [this message]
2016-10-08 20:57 ` [PATCH v3 06/18] x86/intel_rdt: Add CONFIG, Makefile, and basic initialization Borislav Petkov
2016-10-08 2:45 ` [PATCH v3 07/18] x86/intel_rdt: Add Haswell feature discovery Fenghua Yu
2016-10-09 11:41 ` Borislav Petkov
2016-10-09 17:09 ` Fenghua Yu
2016-10-09 16:28 ` Borislav Petkov
2016-10-10 18:55 ` Luck, Tony
2016-10-11 11:12 ` Borislav Petkov
2016-10-11 14:51 ` Luck, Tony
2016-10-08 2:45 ` [PATCH v3 08/18] x86/intel_rdt: Pick up L3 RDT parameters from CPUID Fenghua Yu
2016-10-08 2:45 ` [PATCH v3 09/18] x86/cqm: Move PQR_ASSOC management code into generic code used by both CQM and CAT Fenghua Yu
2016-10-08 2:45 ` [PATCH v3 10/18] x86/intel_rdt: Build structures for each resource based on cache topology Fenghua Yu
2016-10-09 21:57 ` Nilay Vaish
2016-10-08 2:45 ` [PATCH v3 11/18] x86/intel_rdt: Add basic resctrl filesystem support Fenghua Yu
2016-10-09 22:31 ` Nilay Vaish
2016-10-10 23:44 ` Luck, Tony
2016-10-08 2:45 ` [PATCH v3 12/18] x86/intel_rdt: Add "info" files to resctrl file system Fenghua Yu
2016-10-08 2:45 ` [PATCH v3 13/18] x86/intel_rdt: Add mkdir " Fenghua Yu
2016-10-10 17:51 ` Nilay Vaish
2016-10-08 2:45 ` [PATCH v3 14/18] x86/intel_rdt: Add cpus file Fenghua Yu
2016-10-08 2:46 ` [PATCH v3 15/18] x86/intel_rdt: Add tasks files Fenghua Yu
2016-10-08 2:46 ` [PATCH v3 16/18] x86/intel_rdt: Add schemata file Fenghua Yu
2016-10-08 2:46 ` [PATCH v3 17/18] x86/intel_rdt: Add scheduler hook Fenghua Yu
2016-10-08 2:46 ` [PATCH v3 18/18] MAINTAINERS: Add maintainer for Intel RDT resource allocation Fenghua Yu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1475894763-64683-7-git-send-email-fenghua.yu@intel.com \
--to=fenghua.yu@intel.com \
--cc=bp@suse.de \
--cc=dave.hansen@intel.com \
--cc=davidcc@google.com \
--cc=eranian@google.com \
--cc=h.peter.anvin@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=nilayvaish@gmail.com \
--cc=peterz@infradead.org \
--cc=ravi.v.shankar@intel.com \
--cc=sai.praneeth.prakhya@intel.com \
--cc=shli@fb.com \
--cc=tglx@linutronix.de \
--cc=tony.luck@intel.com \
--cc=vikas.shivappa@linux.intel.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).