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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
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/*
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* Resource Director Technology(RDT)
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* - Cache Allocation code.
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*
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* Copyright (C) 2016 Intel Corporation
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*
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* Authors:
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* Fenghua Yu <fenghua.yu@intel.com>
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* Tony Luck <tony.luck@intel.com>
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* Vikas Shivappa <vikas.shivappa@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* More information about RDT be found in the Intel (R) x86 Architecture
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* Software Developer Manual June 2016, volume 3, section 17.17.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/slab.h>
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#include <linux/err.h>
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static inline bool get_rdt_resources(void)
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{
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bool ret = false;
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if (!boot_cpu_has(X86_FEATURE_RDT_A))
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return false;
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if (boot_cpu_has(X86_FEATURE_CAT_L3))
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ret = true;
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return ret;
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}
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static int __init intel_rdt_late_init(void)
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{
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if (!get_rdt_resources())
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return -ENODEV;
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pr_info("Intel RDT cache allocation detected\n");
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if (boot_cpu_has(X86_FEATURE_CDP_L3))
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pr_info("Intel RDT code data prioritization detected\n");
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return 0;
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}
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late_initcall(intel_rdt_late_init);
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