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/*
* 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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