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b61b8bba18
When the last CPU in an rdt_domain goes offline, its rdt_domain struct gets freed. Current pseudo-locking code is unaware of this scenario and tries to dereference the freed structure in a few places. Add checks to prevent pseudo-locking code from doing this. While further work is needed to seamlessly restore resource groups (not just pseudo-locking) to their configuration when the domain is brought back online, the immediate issue of invalid pointers is addressed here. Fixes:f4e80d67a5
("x86/intel_rdt: Resctrl files reflect pseudo-locked information") Fixes:443810fe61
("x86/intel_rdt: Create debugfs files for pseudo-locking testing") Fixes:746e08590b
("x86/intel_rdt: Create character device exposing pseudo-locked region") Fixes:33dc3e410a
("x86/intel_rdt: Make CPU information accessible for pseudo-locked regions") Signed-off-by: Jithu Joseph <jithu.joseph@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: fenghua.yu@intel.com Cc: tony.luck@intel.com Cc: gavin.hindman@intel.com Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/231f742dbb7b00a31cc104416860e27dba6b072d.1539384145.git.reinette.chatre@intel.com
910 lines
22 KiB
C
910 lines
22 KiB
C
/*
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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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#include <linux/cacheinfo.h>
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#include <linux/cpuhotplug.h>
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#include <asm/intel-family.h>
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#include <asm/intel_rdt_sched.h>
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#include "intel_rdt.h"
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#define MBA_IS_LINEAR 0x4
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#define MBA_MAX_MBPS U32_MAX
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/* Mutex to protect rdtgroup access. */
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DEFINE_MUTEX(rdtgroup_mutex);
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/*
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* The cached intel_pqr_state is strictly per CPU and can never be
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* updated from a remote CPU. Functions which modify the state
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* are called with interrupts disabled and no preemption, which
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* is sufficient for the protection.
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*/
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DEFINE_PER_CPU(struct intel_pqr_state, pqr_state);
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/*
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* Used to store the max resource name width and max resource data width
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* to display the schemata in a tabular format
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*/
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int max_name_width, max_data_width;
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/*
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* Global boolean for rdt_alloc which is true if any
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* resource allocation is enabled.
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*/
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bool rdt_alloc_capable;
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static void
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mba_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r);
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static void
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cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r);
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#define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].domains)
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struct rdt_resource rdt_resources_all[] = {
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[RDT_RESOURCE_L3] =
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{
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.rid = RDT_RESOURCE_L3,
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.name = "L3",
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.domains = domain_init(RDT_RESOURCE_L3),
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.msr_base = IA32_L3_CBM_BASE,
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.msr_update = cat_wrmsr,
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.cache_level = 3,
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.cache = {
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.min_cbm_bits = 1,
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.cbm_idx_mult = 1,
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.cbm_idx_offset = 0,
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},
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.parse_ctrlval = parse_cbm,
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.format_str = "%d=%0*x",
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.fflags = RFTYPE_RES_CACHE,
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},
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[RDT_RESOURCE_L3DATA] =
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{
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.rid = RDT_RESOURCE_L3DATA,
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.name = "L3DATA",
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.domains = domain_init(RDT_RESOURCE_L3DATA),
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.msr_base = IA32_L3_CBM_BASE,
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.msr_update = cat_wrmsr,
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.cache_level = 3,
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.cache = {
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.min_cbm_bits = 1,
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.cbm_idx_mult = 2,
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.cbm_idx_offset = 0,
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},
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.parse_ctrlval = parse_cbm,
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.format_str = "%d=%0*x",
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.fflags = RFTYPE_RES_CACHE,
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},
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[RDT_RESOURCE_L3CODE] =
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{
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.rid = RDT_RESOURCE_L3CODE,
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.name = "L3CODE",
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.domains = domain_init(RDT_RESOURCE_L3CODE),
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.msr_base = IA32_L3_CBM_BASE,
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.msr_update = cat_wrmsr,
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.cache_level = 3,
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.cache = {
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.min_cbm_bits = 1,
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.cbm_idx_mult = 2,
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.cbm_idx_offset = 1,
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},
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.parse_ctrlval = parse_cbm,
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.format_str = "%d=%0*x",
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.fflags = RFTYPE_RES_CACHE,
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},
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[RDT_RESOURCE_L2] =
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{
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.rid = RDT_RESOURCE_L2,
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.name = "L2",
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.domains = domain_init(RDT_RESOURCE_L2),
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.msr_base = IA32_L2_CBM_BASE,
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.msr_update = cat_wrmsr,
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.cache_level = 2,
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.cache = {
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.min_cbm_bits = 1,
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.cbm_idx_mult = 1,
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.cbm_idx_offset = 0,
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},
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.parse_ctrlval = parse_cbm,
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.format_str = "%d=%0*x",
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.fflags = RFTYPE_RES_CACHE,
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},
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[RDT_RESOURCE_L2DATA] =
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{
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.rid = RDT_RESOURCE_L2DATA,
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.name = "L2DATA",
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.domains = domain_init(RDT_RESOURCE_L2DATA),
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.msr_base = IA32_L2_CBM_BASE,
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.msr_update = cat_wrmsr,
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.cache_level = 2,
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.cache = {
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.min_cbm_bits = 1,
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.cbm_idx_mult = 2,
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.cbm_idx_offset = 0,
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},
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.parse_ctrlval = parse_cbm,
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.format_str = "%d=%0*x",
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.fflags = RFTYPE_RES_CACHE,
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},
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[RDT_RESOURCE_L2CODE] =
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{
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.rid = RDT_RESOURCE_L2CODE,
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.name = "L2CODE",
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.domains = domain_init(RDT_RESOURCE_L2CODE),
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.msr_base = IA32_L2_CBM_BASE,
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.msr_update = cat_wrmsr,
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.cache_level = 2,
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.cache = {
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.min_cbm_bits = 1,
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.cbm_idx_mult = 2,
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.cbm_idx_offset = 1,
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},
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.parse_ctrlval = parse_cbm,
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.format_str = "%d=%0*x",
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.fflags = RFTYPE_RES_CACHE,
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},
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[RDT_RESOURCE_MBA] =
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{
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.rid = RDT_RESOURCE_MBA,
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.name = "MB",
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.domains = domain_init(RDT_RESOURCE_MBA),
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.msr_base = IA32_MBA_THRTL_BASE,
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.msr_update = mba_wrmsr,
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.cache_level = 3,
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.parse_ctrlval = parse_bw,
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.format_str = "%d=%*u",
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.fflags = RFTYPE_RES_MB,
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},
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};
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static unsigned int cbm_idx(struct rdt_resource *r, unsigned int closid)
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{
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return closid * r->cache.cbm_idx_mult + r->cache.cbm_idx_offset;
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}
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/*
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* cache_alloc_hsw_probe() - Have to probe for Intel haswell server CPUs
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* as they do not have CPUID enumeration support for Cache allocation.
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* The check for Vendor/Family/Model is not enough to guarantee that
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* the MSRs won't #GP fault because only the following SKUs support
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* CAT:
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* Intel(R) Xeon(R) CPU E5-2658 v3 @ 2.20GHz
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* Intel(R) Xeon(R) CPU E5-2648L v3 @ 1.80GHz
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* Intel(R) Xeon(R) CPU E5-2628L v3 @ 2.00GHz
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* Intel(R) Xeon(R) CPU E5-2618L v3 @ 2.30GHz
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* Intel(R) Xeon(R) CPU E5-2608L v3 @ 2.00GHz
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* Intel(R) Xeon(R) CPU E5-2658A v3 @ 2.20GHz
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*
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* Probe by trying to write the first of the L3 cach mask registers
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* and checking that the bits stick. Max CLOSids is always 4 and max cbm length
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* is always 20 on hsw server parts. The minimum cache bitmask length
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* allowed for HSW server is always 2 bits. Hardcode all of them.
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*/
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static inline void cache_alloc_hsw_probe(void)
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{
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struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3];
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u32 l, h, max_cbm = BIT_MASK(20) - 1;
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if (wrmsr_safe(IA32_L3_CBM_BASE, max_cbm, 0))
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return;
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rdmsr(IA32_L3_CBM_BASE, l, h);
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/* If all the bits were set in MSR, return success */
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if (l != max_cbm)
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return;
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r->num_closid = 4;
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r->default_ctrl = max_cbm;
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r->cache.cbm_len = 20;
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r->cache.shareable_bits = 0xc0000;
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r->cache.min_cbm_bits = 2;
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r->alloc_capable = true;
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r->alloc_enabled = true;
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rdt_alloc_capable = true;
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}
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bool is_mba_sc(struct rdt_resource *r)
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{
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if (!r)
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return rdt_resources_all[RDT_RESOURCE_MBA].membw.mba_sc;
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return r->membw.mba_sc;
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}
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/*
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* rdt_get_mb_table() - get a mapping of bandwidth(b/w) percentage values
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* exposed to user interface and the h/w understandable delay values.
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*
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* The non-linear delay values have the granularity of power of two
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* and also the h/w does not guarantee a curve for configured delay
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* values vs. actual b/w enforced.
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* Hence we need a mapping that is pre calibrated so the user can
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* express the memory b/w as a percentage value.
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*/
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static inline bool rdt_get_mb_table(struct rdt_resource *r)
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{
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/*
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* There are no Intel SKUs as of now to support non-linear delay.
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*/
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pr_info("MBA b/w map not implemented for cpu:%d, model:%d",
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boot_cpu_data.x86, boot_cpu_data.x86_model);
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return false;
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}
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static bool rdt_get_mem_config(struct rdt_resource *r)
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{
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union cpuid_0x10_3_eax eax;
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union cpuid_0x10_x_edx edx;
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u32 ebx, ecx;
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cpuid_count(0x00000010, 3, &eax.full, &ebx, &ecx, &edx.full);
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r->num_closid = edx.split.cos_max + 1;
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r->membw.max_delay = eax.split.max_delay + 1;
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r->default_ctrl = MAX_MBA_BW;
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if (ecx & MBA_IS_LINEAR) {
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r->membw.delay_linear = true;
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r->membw.min_bw = MAX_MBA_BW - r->membw.max_delay;
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r->membw.bw_gran = MAX_MBA_BW - r->membw.max_delay;
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} else {
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if (!rdt_get_mb_table(r))
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return false;
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}
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r->data_width = 3;
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r->alloc_capable = true;
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r->alloc_enabled = true;
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return true;
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}
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static void rdt_get_cache_alloc_cfg(int idx, struct rdt_resource *r)
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{
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union cpuid_0x10_1_eax eax;
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union cpuid_0x10_x_edx edx;
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u32 ebx, ecx;
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cpuid_count(0x00000010, idx, &eax.full, &ebx, &ecx, &edx.full);
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r->num_closid = edx.split.cos_max + 1;
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r->cache.cbm_len = eax.split.cbm_len + 1;
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r->default_ctrl = BIT_MASK(eax.split.cbm_len + 1) - 1;
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r->cache.shareable_bits = ebx & r->default_ctrl;
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r->data_width = (r->cache.cbm_len + 3) / 4;
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r->alloc_capable = true;
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r->alloc_enabled = true;
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}
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static void rdt_get_cdp_config(int level, int type)
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{
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struct rdt_resource *r_l = &rdt_resources_all[level];
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struct rdt_resource *r = &rdt_resources_all[type];
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r->num_closid = r_l->num_closid / 2;
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r->cache.cbm_len = r_l->cache.cbm_len;
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r->default_ctrl = r_l->default_ctrl;
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r->cache.shareable_bits = r_l->cache.shareable_bits;
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r->data_width = (r->cache.cbm_len + 3) / 4;
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r->alloc_capable = true;
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/*
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* By default, CDP is disabled. CDP can be enabled by mount parameter
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* "cdp" during resctrl file system mount time.
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*/
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r->alloc_enabled = false;
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}
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static void rdt_get_cdp_l3_config(void)
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{
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rdt_get_cdp_config(RDT_RESOURCE_L3, RDT_RESOURCE_L3DATA);
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rdt_get_cdp_config(RDT_RESOURCE_L3, RDT_RESOURCE_L3CODE);
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}
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static void rdt_get_cdp_l2_config(void)
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{
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rdt_get_cdp_config(RDT_RESOURCE_L2, RDT_RESOURCE_L2DATA);
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rdt_get_cdp_config(RDT_RESOURCE_L2, RDT_RESOURCE_L2CODE);
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}
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static int get_cache_id(int cpu, int level)
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{
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struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
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int i;
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for (i = 0; i < ci->num_leaves; i++) {
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if (ci->info_list[i].level == level)
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return ci->info_list[i].id;
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}
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return -1;
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}
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/*
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* Map the memory b/w percentage value to delay values
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* that can be written to QOS_MSRs.
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* There are currently no SKUs which support non linear delay values.
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*/
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u32 delay_bw_map(unsigned long bw, struct rdt_resource *r)
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{
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if (r->membw.delay_linear)
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return MAX_MBA_BW - bw;
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pr_warn_once("Non Linear delay-bw map not supported but queried\n");
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return r->default_ctrl;
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}
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static void
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mba_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
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{
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unsigned int i;
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/* Write the delay values for mba. */
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for (i = m->low; i < m->high; i++)
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wrmsrl(r->msr_base + i, delay_bw_map(d->ctrl_val[i], r));
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}
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static void
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cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
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{
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unsigned int i;
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for (i = m->low; i < m->high; i++)
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wrmsrl(r->msr_base + cbm_idx(r, i), d->ctrl_val[i]);
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}
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struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
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{
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struct rdt_domain *d;
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list_for_each_entry(d, &r->domains, list) {
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/* Find the domain that contains this CPU */
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if (cpumask_test_cpu(cpu, &d->cpu_mask))
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return d;
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}
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return NULL;
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}
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void rdt_ctrl_update(void *arg)
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{
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struct msr_param *m = arg;
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struct rdt_resource *r = m->res;
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int cpu = smp_processor_id();
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struct rdt_domain *d;
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d = get_domain_from_cpu(cpu, r);
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if (d) {
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r->msr_update(d, m, r);
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return;
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}
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pr_warn_once("cpu %d not found in any domain for resource %s\n",
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cpu, r->name);
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}
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/*
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* rdt_find_domain - Find a domain in a resource that matches input resource id
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*
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* Search resource r's domain list to find the resource id. If the resource
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* id is found in a domain, return the domain. Otherwise, if requested by
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* caller, return the first domain whose id is bigger than the input id.
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* The domain list is sorted by id in ascending order.
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*/
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struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
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struct list_head **pos)
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{
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struct rdt_domain *d;
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struct list_head *l;
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if (id < 0)
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return ERR_PTR(id);
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list_for_each(l, &r->domains) {
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d = list_entry(l, struct rdt_domain, list);
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/* When id is found, return its domain. */
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if (id == d->id)
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return d;
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/* Stop searching when finding id's position in sorted list. */
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if (id < d->id)
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break;
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}
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if (pos)
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*pos = l;
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return NULL;
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}
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void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm)
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{
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int i;
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/*
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* Initialize the Control MSRs to having no control.
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* For Cache Allocation: Set all bits in cbm
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* For Memory Allocation: Set b/w requested to 100%
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* and the bandwidth in MBps to U32_MAX
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*/
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for (i = 0; i < r->num_closid; i++, dc++, dm++) {
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*dc = r->default_ctrl;
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*dm = MBA_MAX_MBPS;
|
|
}
|
|
}
|
|
|
|
static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
|
|
{
|
|
struct msr_param m;
|
|
u32 *dc, *dm;
|
|
|
|
dc = kmalloc_array(r->num_closid, sizeof(*d->ctrl_val), GFP_KERNEL);
|
|
if (!dc)
|
|
return -ENOMEM;
|
|
|
|
dm = kmalloc_array(r->num_closid, sizeof(*d->mbps_val), GFP_KERNEL);
|
|
if (!dm) {
|
|
kfree(dc);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
d->ctrl_val = dc;
|
|
d->mbps_val = dm;
|
|
setup_default_ctrlval(r, dc, dm);
|
|
|
|
m.low = 0;
|
|
m.high = r->num_closid;
|
|
r->msr_update(d, &m, r);
|
|
return 0;
|
|
}
|
|
|
|
static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
|
|
{
|
|
size_t tsize;
|
|
|
|
if (is_llc_occupancy_enabled()) {
|
|
d->rmid_busy_llc = bitmap_zalloc(r->num_rmid, GFP_KERNEL);
|
|
if (!d->rmid_busy_llc)
|
|
return -ENOMEM;
|
|
INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo);
|
|
}
|
|
if (is_mbm_total_enabled()) {
|
|
tsize = sizeof(*d->mbm_total);
|
|
d->mbm_total = kcalloc(r->num_rmid, tsize, GFP_KERNEL);
|
|
if (!d->mbm_total) {
|
|
bitmap_free(d->rmid_busy_llc);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
if (is_mbm_local_enabled()) {
|
|
tsize = sizeof(*d->mbm_local);
|
|
d->mbm_local = kcalloc(r->num_rmid, tsize, GFP_KERNEL);
|
|
if (!d->mbm_local) {
|
|
bitmap_free(d->rmid_busy_llc);
|
|
kfree(d->mbm_total);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
if (is_mbm_enabled()) {
|
|
INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow);
|
|
mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* domain_add_cpu - Add a cpu to a resource's domain list.
|
|
*
|
|
* If an existing domain in the resource r's domain list matches the cpu's
|
|
* resource id, add the cpu in the domain.
|
|
*
|
|
* Otherwise, a new domain is allocated and inserted into the right position
|
|
* in the domain list sorted by id in ascending order.
|
|
*
|
|
* The order in the domain list is visible to users when we print entries
|
|
* in the schemata file and schemata input is validated to have the same order
|
|
* as this list.
|
|
*/
|
|
static void domain_add_cpu(int cpu, struct rdt_resource *r)
|
|
{
|
|
int id = get_cache_id(cpu, r->cache_level);
|
|
struct list_head *add_pos = NULL;
|
|
struct rdt_domain *d;
|
|
|
|
d = rdt_find_domain(r, id, &add_pos);
|
|
if (IS_ERR(d)) {
|
|
pr_warn("Could't find cache id for cpu %d\n", cpu);
|
|
return;
|
|
}
|
|
|
|
if (d) {
|
|
cpumask_set_cpu(cpu, &d->cpu_mask);
|
|
return;
|
|
}
|
|
|
|
d = kzalloc_node(sizeof(*d), GFP_KERNEL, cpu_to_node(cpu));
|
|
if (!d)
|
|
return;
|
|
|
|
d->id = id;
|
|
cpumask_set_cpu(cpu, &d->cpu_mask);
|
|
|
|
if (r->alloc_capable && domain_setup_ctrlval(r, d)) {
|
|
kfree(d);
|
|
return;
|
|
}
|
|
|
|
if (r->mon_capable && domain_setup_mon_state(r, d)) {
|
|
kfree(d);
|
|
return;
|
|
}
|
|
|
|
list_add_tail(&d->list, add_pos);
|
|
|
|
/*
|
|
* If resctrl is mounted, add
|
|
* per domain monitor data directories.
|
|
*/
|
|
if (static_branch_unlikely(&rdt_mon_enable_key))
|
|
mkdir_mondata_subdir_allrdtgrp(r, d);
|
|
}
|
|
|
|
static void domain_remove_cpu(int cpu, struct rdt_resource *r)
|
|
{
|
|
int id = get_cache_id(cpu, r->cache_level);
|
|
struct rdt_domain *d;
|
|
|
|
d = rdt_find_domain(r, id, NULL);
|
|
if (IS_ERR_OR_NULL(d)) {
|
|
pr_warn("Could't find cache id for cpu %d\n", cpu);
|
|
return;
|
|
}
|
|
|
|
cpumask_clear_cpu(cpu, &d->cpu_mask);
|
|
if (cpumask_empty(&d->cpu_mask)) {
|
|
/*
|
|
* If resctrl is mounted, remove all the
|
|
* per domain monitor data directories.
|
|
*/
|
|
if (static_branch_unlikely(&rdt_mon_enable_key))
|
|
rmdir_mondata_subdir_allrdtgrp(r, d->id);
|
|
list_del(&d->list);
|
|
if (is_mbm_enabled())
|
|
cancel_delayed_work(&d->mbm_over);
|
|
if (is_llc_occupancy_enabled() && has_busy_rmid(r, d)) {
|
|
/*
|
|
* When a package is going down, forcefully
|
|
* decrement rmid->ebusy. There is no way to know
|
|
* that the L3 was flushed and hence may lead to
|
|
* incorrect counts in rare scenarios, but leaving
|
|
* the RMID as busy creates RMID leaks if the
|
|
* package never comes back.
|
|
*/
|
|
__check_limbo(d, true);
|
|
cancel_delayed_work(&d->cqm_limbo);
|
|
}
|
|
|
|
/*
|
|
* rdt_domain "d" is going to be freed below, so clear
|
|
* its pointer from pseudo_lock_region struct.
|
|
*/
|
|
if (d->plr)
|
|
d->plr->d = NULL;
|
|
|
|
kfree(d->ctrl_val);
|
|
kfree(d->mbps_val);
|
|
bitmap_free(d->rmid_busy_llc);
|
|
kfree(d->mbm_total);
|
|
kfree(d->mbm_local);
|
|
kfree(d);
|
|
return;
|
|
}
|
|
|
|
if (r == &rdt_resources_all[RDT_RESOURCE_L3]) {
|
|
if (is_mbm_enabled() && cpu == d->mbm_work_cpu) {
|
|
cancel_delayed_work(&d->mbm_over);
|
|
mbm_setup_overflow_handler(d, 0);
|
|
}
|
|
if (is_llc_occupancy_enabled() && cpu == d->cqm_work_cpu &&
|
|
has_busy_rmid(r, d)) {
|
|
cancel_delayed_work(&d->cqm_limbo);
|
|
cqm_setup_limbo_handler(d, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void clear_closid_rmid(int cpu)
|
|
{
|
|
struct intel_pqr_state *state = this_cpu_ptr(&pqr_state);
|
|
|
|
state->default_closid = 0;
|
|
state->default_rmid = 0;
|
|
state->cur_closid = 0;
|
|
state->cur_rmid = 0;
|
|
wrmsr(IA32_PQR_ASSOC, 0, 0);
|
|
}
|
|
|
|
static int intel_rdt_online_cpu(unsigned int cpu)
|
|
{
|
|
struct rdt_resource *r;
|
|
|
|
mutex_lock(&rdtgroup_mutex);
|
|
for_each_capable_rdt_resource(r)
|
|
domain_add_cpu(cpu, r);
|
|
/* The cpu is set in default rdtgroup after online. */
|
|
cpumask_set_cpu(cpu, &rdtgroup_default.cpu_mask);
|
|
clear_closid_rmid(cpu);
|
|
mutex_unlock(&rdtgroup_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void clear_childcpus(struct rdtgroup *r, unsigned int cpu)
|
|
{
|
|
struct rdtgroup *cr;
|
|
|
|
list_for_each_entry(cr, &r->mon.crdtgrp_list, mon.crdtgrp_list) {
|
|
if (cpumask_test_and_clear_cpu(cpu, &cr->cpu_mask)) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int intel_rdt_offline_cpu(unsigned int cpu)
|
|
{
|
|
struct rdtgroup *rdtgrp;
|
|
struct rdt_resource *r;
|
|
|
|
mutex_lock(&rdtgroup_mutex);
|
|
for_each_capable_rdt_resource(r)
|
|
domain_remove_cpu(cpu, r);
|
|
list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
|
|
if (cpumask_test_and_clear_cpu(cpu, &rdtgrp->cpu_mask)) {
|
|
clear_childcpus(rdtgrp, cpu);
|
|
break;
|
|
}
|
|
}
|
|
clear_closid_rmid(cpu);
|
|
mutex_unlock(&rdtgroup_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Choose a width for the resource name and resource data based on the
|
|
* resource that has widest name and cbm.
|
|
*/
|
|
static __init void rdt_init_padding(void)
|
|
{
|
|
struct rdt_resource *r;
|
|
int cl;
|
|
|
|
for_each_alloc_capable_rdt_resource(r) {
|
|
cl = strlen(r->name);
|
|
if (cl > max_name_width)
|
|
max_name_width = cl;
|
|
|
|
if (r->data_width > max_data_width)
|
|
max_data_width = r->data_width;
|
|
}
|
|
}
|
|
|
|
enum {
|
|
RDT_FLAG_CMT,
|
|
RDT_FLAG_MBM_TOTAL,
|
|
RDT_FLAG_MBM_LOCAL,
|
|
RDT_FLAG_L3_CAT,
|
|
RDT_FLAG_L3_CDP,
|
|
RDT_FLAG_L2_CAT,
|
|
RDT_FLAG_L2_CDP,
|
|
RDT_FLAG_MBA,
|
|
};
|
|
|
|
#define RDT_OPT(idx, n, f) \
|
|
[idx] = { \
|
|
.name = n, \
|
|
.flag = f \
|
|
}
|
|
|
|
struct rdt_options {
|
|
char *name;
|
|
int flag;
|
|
bool force_off, force_on;
|
|
};
|
|
|
|
static struct rdt_options rdt_options[] __initdata = {
|
|
RDT_OPT(RDT_FLAG_CMT, "cmt", X86_FEATURE_CQM_OCCUP_LLC),
|
|
RDT_OPT(RDT_FLAG_MBM_TOTAL, "mbmtotal", X86_FEATURE_CQM_MBM_TOTAL),
|
|
RDT_OPT(RDT_FLAG_MBM_LOCAL, "mbmlocal", X86_FEATURE_CQM_MBM_LOCAL),
|
|
RDT_OPT(RDT_FLAG_L3_CAT, "l3cat", X86_FEATURE_CAT_L3),
|
|
RDT_OPT(RDT_FLAG_L3_CDP, "l3cdp", X86_FEATURE_CDP_L3),
|
|
RDT_OPT(RDT_FLAG_L2_CAT, "l2cat", X86_FEATURE_CAT_L2),
|
|
RDT_OPT(RDT_FLAG_L2_CDP, "l2cdp", X86_FEATURE_CDP_L2),
|
|
RDT_OPT(RDT_FLAG_MBA, "mba", X86_FEATURE_MBA),
|
|
};
|
|
#define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options)
|
|
|
|
static int __init set_rdt_options(char *str)
|
|
{
|
|
struct rdt_options *o;
|
|
bool force_off;
|
|
char *tok;
|
|
|
|
if (*str == '=')
|
|
str++;
|
|
while ((tok = strsep(&str, ",")) != NULL) {
|
|
force_off = *tok == '!';
|
|
if (force_off)
|
|
tok++;
|
|
for (o = rdt_options; o < &rdt_options[NUM_RDT_OPTIONS]; o++) {
|
|
if (strcmp(tok, o->name) == 0) {
|
|
if (force_off)
|
|
o->force_off = true;
|
|
else
|
|
o->force_on = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
__setup("rdt", set_rdt_options);
|
|
|
|
static bool __init rdt_cpu_has(int flag)
|
|
{
|
|
bool ret = boot_cpu_has(flag);
|
|
struct rdt_options *o;
|
|
|
|
if (!ret)
|
|
return ret;
|
|
|
|
for (o = rdt_options; o < &rdt_options[NUM_RDT_OPTIONS]; o++) {
|
|
if (flag == o->flag) {
|
|
if (o->force_off)
|
|
ret = false;
|
|
if (o->force_on)
|
|
ret = true;
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static __init bool get_rdt_alloc_resources(void)
|
|
{
|
|
bool ret = false;
|
|
|
|
if (rdt_alloc_capable)
|
|
return true;
|
|
|
|
if (!boot_cpu_has(X86_FEATURE_RDT_A))
|
|
return false;
|
|
|
|
if (rdt_cpu_has(X86_FEATURE_CAT_L3)) {
|
|
rdt_get_cache_alloc_cfg(1, &rdt_resources_all[RDT_RESOURCE_L3]);
|
|
if (rdt_cpu_has(X86_FEATURE_CDP_L3))
|
|
rdt_get_cdp_l3_config();
|
|
ret = true;
|
|
}
|
|
if (rdt_cpu_has(X86_FEATURE_CAT_L2)) {
|
|
/* CPUID 0x10.2 fields are same format at 0x10.1 */
|
|
rdt_get_cache_alloc_cfg(2, &rdt_resources_all[RDT_RESOURCE_L2]);
|
|
if (rdt_cpu_has(X86_FEATURE_CDP_L2))
|
|
rdt_get_cdp_l2_config();
|
|
ret = true;
|
|
}
|
|
|
|
if (rdt_cpu_has(X86_FEATURE_MBA)) {
|
|
if (rdt_get_mem_config(&rdt_resources_all[RDT_RESOURCE_MBA]))
|
|
ret = true;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static __init bool get_rdt_mon_resources(void)
|
|
{
|
|
if (rdt_cpu_has(X86_FEATURE_CQM_OCCUP_LLC))
|
|
rdt_mon_features |= (1 << QOS_L3_OCCUP_EVENT_ID);
|
|
if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL))
|
|
rdt_mon_features |= (1 << QOS_L3_MBM_TOTAL_EVENT_ID);
|
|
if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))
|
|
rdt_mon_features |= (1 << QOS_L3_MBM_LOCAL_EVENT_ID);
|
|
|
|
if (!rdt_mon_features)
|
|
return false;
|
|
|
|
return !rdt_get_mon_l3_config(&rdt_resources_all[RDT_RESOURCE_L3]);
|
|
}
|
|
|
|
static __init void rdt_quirks(void)
|
|
{
|
|
switch (boot_cpu_data.x86_model) {
|
|
case INTEL_FAM6_HASWELL_X:
|
|
if (!rdt_options[RDT_FLAG_L3_CAT].force_off)
|
|
cache_alloc_hsw_probe();
|
|
break;
|
|
case INTEL_FAM6_SKYLAKE_X:
|
|
if (boot_cpu_data.x86_stepping <= 4)
|
|
set_rdt_options("!cmt,!mbmtotal,!mbmlocal,!l3cat");
|
|
else
|
|
set_rdt_options("!l3cat");
|
|
}
|
|
}
|
|
|
|
static __init bool get_rdt_resources(void)
|
|
{
|
|
rdt_quirks();
|
|
rdt_alloc_capable = get_rdt_alloc_resources();
|
|
rdt_mon_capable = get_rdt_mon_resources();
|
|
|
|
return (rdt_mon_capable || rdt_alloc_capable);
|
|
}
|
|
|
|
static enum cpuhp_state rdt_online;
|
|
|
|
static int __init intel_rdt_late_init(void)
|
|
{
|
|
struct rdt_resource *r;
|
|
int state, ret;
|
|
|
|
if (!get_rdt_resources())
|
|
return -ENODEV;
|
|
|
|
rdt_init_padding();
|
|
|
|
state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
|
|
"x86/rdt/cat:online:",
|
|
intel_rdt_online_cpu, intel_rdt_offline_cpu);
|
|
if (state < 0)
|
|
return state;
|
|
|
|
ret = rdtgroup_init();
|
|
if (ret) {
|
|
cpuhp_remove_state(state);
|
|
return ret;
|
|
}
|
|
rdt_online = state;
|
|
|
|
for_each_alloc_capable_rdt_resource(r)
|
|
pr_info("Intel RDT %s allocation detected\n", r->name);
|
|
|
|
for_each_mon_capable_rdt_resource(r)
|
|
pr_info("Intel RDT %s monitoring detected\n", r->name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(intel_rdt_late_init);
|
|
|
|
static void __exit intel_rdt_exit(void)
|
|
{
|
|
cpuhp_remove_state(rdt_online);
|
|
rdtgroup_exit();
|
|
}
|
|
|
|
__exitcall(intel_rdt_exit);
|