555 lines
16 KiB
C
555 lines
16 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_RESCTRL_INTERNAL_H
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#define _ASM_X86_RESCTRL_INTERNAL_H
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#include <linux/resctrl.h>
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#include <linux/sched.h>
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#include <linux/kernfs.h>
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#include <linux/fs_context.h>
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#include <linux/jump_label.h>
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#define MSR_IA32_L3_QOS_CFG 0xc81
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#define MSR_IA32_L2_QOS_CFG 0xc82
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#define MSR_IA32_L3_CBM_BASE 0xc90
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#define MSR_IA32_L2_CBM_BASE 0xd10
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#define MSR_IA32_MBA_THRTL_BASE 0xd50
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#define MSR_IA32_MBA_BW_BASE 0xc0000200
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#define MSR_IA32_QM_CTR 0x0c8e
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#define MSR_IA32_QM_EVTSEL 0x0c8d
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#define L3_QOS_CDP_ENABLE 0x01ULL
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#define L2_QOS_CDP_ENABLE 0x01ULL
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/*
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* Event IDs are used to program IA32_QM_EVTSEL before reading event
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* counter from IA32_QM_CTR
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*/
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#define QOS_L3_OCCUP_EVENT_ID 0x01
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#define QOS_L3_MBM_TOTAL_EVENT_ID 0x02
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#define QOS_L3_MBM_LOCAL_EVENT_ID 0x03
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#define CQM_LIMBOCHECK_INTERVAL 1000
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#define MBM_CNTR_WIDTH_BASE 24
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#define MBM_OVERFLOW_INTERVAL 1000
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#define MAX_MBA_BW 100u
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#define MBA_IS_LINEAR 0x4
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#define MBA_MAX_MBPS U32_MAX
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#define MAX_MBA_BW_AMD 0x800
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#define MBM_CNTR_WIDTH_OFFSET_AMD 20
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#define RMID_VAL_ERROR BIT_ULL(63)
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#define RMID_VAL_UNAVAIL BIT_ULL(62)
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/*
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* With the above fields in use 62 bits remain in MSR_IA32_QM_CTR for
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* data to be returned. The counter width is discovered from the hardware
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* as an offset from MBM_CNTR_WIDTH_BASE.
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*/
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#define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
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struct rdt_fs_context {
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struct kernfs_fs_context kfc;
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bool enable_cdpl2;
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bool enable_cdpl3;
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bool enable_mba_mbps;
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};
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static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
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{
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struct kernfs_fs_context *kfc = fc->fs_private;
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return container_of(kfc, struct rdt_fs_context, kfc);
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}
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DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
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DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key);
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/**
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* struct mon_evt - Entry in the event list of a resource
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* @evtid: event id
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* @name: name of the event
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* @list: entry in &rdt_resource->evt_list
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*/
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struct mon_evt {
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u32 evtid;
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char *name;
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struct list_head list;
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};
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/**
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* union mon_data_bits - Monitoring details for each event file
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* @priv: Used to store monitoring event data in @u
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* as kernfs private data
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* @rid: Resource id associated with the event file
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* @evtid: Event id associated with the event file
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* @domid: The domain to which the event file belongs
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* @u: Name of the bit fields struct
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*/
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union mon_data_bits {
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void *priv;
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struct {
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unsigned int rid : 10;
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unsigned int evtid : 8;
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unsigned int domid : 14;
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} u;
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};
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struct rmid_read {
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struct rdtgroup *rgrp;
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struct rdt_resource *r;
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struct rdt_domain *d;
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int evtid;
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bool first;
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u64 val;
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};
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extern unsigned int resctrl_cqm_threshold;
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extern bool rdt_alloc_capable;
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extern bool rdt_mon_capable;
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extern unsigned int rdt_mon_features;
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extern struct list_head resctrl_schema_all;
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enum rdt_group_type {
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RDTCTRL_GROUP = 0,
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RDTMON_GROUP,
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RDT_NUM_GROUP,
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};
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/**
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* enum rdtgrp_mode - Mode of a RDT resource group
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* @RDT_MODE_SHAREABLE: This resource group allows sharing of its allocations
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* @RDT_MODE_EXCLUSIVE: No sharing of this resource group's allocations allowed
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* @RDT_MODE_PSEUDO_LOCKSETUP: Resource group will be used for Pseudo-Locking
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* @RDT_MODE_PSEUDO_LOCKED: No sharing of this resource group's allocations
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* allowed AND the allocations are Cache Pseudo-Locked
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* @RDT_NUM_MODES: Total number of modes
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*
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* The mode of a resource group enables control over the allowed overlap
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* between allocations associated with different resource groups (classes
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* of service). User is able to modify the mode of a resource group by
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* writing to the "mode" resctrl file associated with the resource group.
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*
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* The "shareable", "exclusive", and "pseudo-locksetup" modes are set by
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* writing the appropriate text to the "mode" file. A resource group enters
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* "pseudo-locked" mode after the schemata is written while the resource
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* group is in "pseudo-locksetup" mode.
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*/
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enum rdtgrp_mode {
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RDT_MODE_SHAREABLE = 0,
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RDT_MODE_EXCLUSIVE,
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RDT_MODE_PSEUDO_LOCKSETUP,
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RDT_MODE_PSEUDO_LOCKED,
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/* Must be last */
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RDT_NUM_MODES,
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};
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/**
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* struct mongroup - store mon group's data in resctrl fs.
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* @mon_data_kn: kernfs node for the mon_data directory
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* @parent: parent rdtgrp
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* @crdtgrp_list: child rdtgroup node list
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* @rmid: rmid for this rdtgroup
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*/
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struct mongroup {
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struct kernfs_node *mon_data_kn;
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struct rdtgroup *parent;
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struct list_head crdtgrp_list;
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u32 rmid;
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};
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/**
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* struct pseudo_lock_region - pseudo-lock region information
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* @s: Resctrl schema for the resource to which this
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* pseudo-locked region belongs
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* @d: RDT domain to which this pseudo-locked region
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* belongs
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* @cbm: bitmask of the pseudo-locked region
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* @lock_thread_wq: waitqueue used to wait on the pseudo-locking thread
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* completion
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* @thread_done: variable used by waitqueue to test if pseudo-locking
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* thread completed
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* @cpu: core associated with the cache on which the setup code
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* will be run
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* @line_size: size of the cache lines
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* @size: size of pseudo-locked region in bytes
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* @kmem: the kernel memory associated with pseudo-locked region
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* @minor: minor number of character device associated with this
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* region
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* @debugfs_dir: pointer to this region's directory in the debugfs
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* filesystem
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* @pm_reqs: Power management QoS requests related to this region
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*/
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struct pseudo_lock_region {
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struct resctrl_schema *s;
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struct rdt_domain *d;
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u32 cbm;
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wait_queue_head_t lock_thread_wq;
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int thread_done;
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int cpu;
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unsigned int line_size;
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unsigned int size;
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void *kmem;
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unsigned int minor;
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struct dentry *debugfs_dir;
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struct list_head pm_reqs;
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};
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/**
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* struct rdtgroup - store rdtgroup's data in resctrl file system.
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* @kn: kernfs node
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* @rdtgroup_list: linked list for all rdtgroups
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* @closid: closid for this rdtgroup
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* @cpu_mask: CPUs assigned to this rdtgroup
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* @flags: status bits
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* @waitcount: how many cpus expect to find this
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* group when they acquire rdtgroup_mutex
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* @type: indicates type of this rdtgroup - either
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* monitor only or ctrl_mon group
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* @mon: mongroup related data
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* @mode: mode of resource group
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* @plr: pseudo-locked region
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*/
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struct rdtgroup {
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struct kernfs_node *kn;
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struct list_head rdtgroup_list;
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u32 closid;
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struct cpumask cpu_mask;
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int flags;
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atomic_t waitcount;
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enum rdt_group_type type;
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struct mongroup mon;
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enum rdtgrp_mode mode;
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struct pseudo_lock_region *plr;
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};
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/* rdtgroup.flags */
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#define RDT_DELETED 1
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/* rftype.flags */
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#define RFTYPE_FLAGS_CPUS_LIST 1
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/*
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* Define the file type flags for base and info directories.
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*/
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#define RFTYPE_INFO BIT(0)
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#define RFTYPE_BASE BIT(1)
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#define RF_CTRLSHIFT 4
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#define RF_MONSHIFT 5
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#define RF_TOPSHIFT 6
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#define RFTYPE_CTRL BIT(RF_CTRLSHIFT)
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#define RFTYPE_MON BIT(RF_MONSHIFT)
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#define RFTYPE_TOP BIT(RF_TOPSHIFT)
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#define RFTYPE_RES_CACHE BIT(8)
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#define RFTYPE_RES_MB BIT(9)
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#define RF_CTRL_INFO (RFTYPE_INFO | RFTYPE_CTRL)
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#define RF_MON_INFO (RFTYPE_INFO | RFTYPE_MON)
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#define RF_TOP_INFO (RFTYPE_INFO | RFTYPE_TOP)
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#define RF_CTRL_BASE (RFTYPE_BASE | RFTYPE_CTRL)
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/* List of all resource groups */
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extern struct list_head rdt_all_groups;
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extern int max_name_width, max_data_width;
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int __init rdtgroup_init(void);
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void __exit rdtgroup_exit(void);
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/**
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* struct rftype - describe each file in the resctrl file system
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* @name: File name
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* @mode: Access mode
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* @kf_ops: File operations
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* @flags: File specific RFTYPE_FLAGS_* flags
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* @fflags: File specific RF_* or RFTYPE_* flags
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* @seq_show: Show content of the file
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* @write: Write to the file
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*/
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struct rftype {
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char *name;
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umode_t mode;
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const struct kernfs_ops *kf_ops;
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unsigned long flags;
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unsigned long fflags;
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int (*seq_show)(struct kernfs_open_file *of,
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struct seq_file *sf, void *v);
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/*
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* write() is the generic write callback which maps directly to
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* kernfs write operation and overrides all other operations.
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* Maximum write size is determined by ->max_write_len.
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*/
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ssize_t (*write)(struct kernfs_open_file *of,
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char *buf, size_t nbytes, loff_t off);
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};
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/**
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* struct mbm_state - status for each MBM counter in each domain
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* @chunks: Total data moved (multiply by rdt_group.mon_scale to get bytes)
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* @prev_msr: Value of IA32_QM_CTR for this RMID last time we read it
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* @prev_bw_msr:Value of previous IA32_QM_CTR for bandwidth counting
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* @prev_bw: The most recent bandwidth in MBps
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* @delta_bw: Difference between the current and previous bandwidth
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* @delta_comp: Indicates whether to compute the delta_bw
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*/
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struct mbm_state {
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u64 chunks;
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u64 prev_msr;
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u64 prev_bw_msr;
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u32 prev_bw;
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u32 delta_bw;
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bool delta_comp;
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};
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/**
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* struct rdt_hw_domain - Arch private attributes of a set of CPUs that share
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* a resource
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* @d_resctrl: Properties exposed to the resctrl file system
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* @ctrl_val: array of cache or mem ctrl values (indexed by CLOSID)
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* @mbps_val: When mba_sc is enabled, this holds the bandwidth in MBps
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*
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* Members of this structure are accessed via helpers that provide abstraction.
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*/
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struct rdt_hw_domain {
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struct rdt_domain d_resctrl;
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u32 *ctrl_val;
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u32 *mbps_val;
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};
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static inline struct rdt_hw_domain *resctrl_to_arch_dom(struct rdt_domain *r)
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{
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return container_of(r, struct rdt_hw_domain, d_resctrl);
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}
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/**
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* struct msr_param - set a range of MSRs from a domain
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* @res: The resource to use
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* @low: Beginning index from base MSR
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* @high: End index
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*/
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struct msr_param {
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struct rdt_resource *res;
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u32 low;
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u32 high;
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};
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static inline bool is_llc_occupancy_enabled(void)
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{
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return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
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}
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static inline bool is_mbm_total_enabled(void)
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{
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return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID));
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}
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static inline bool is_mbm_local_enabled(void)
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{
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return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID));
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}
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static inline bool is_mbm_enabled(void)
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{
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return (is_mbm_total_enabled() || is_mbm_local_enabled());
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}
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static inline bool is_mbm_event(int e)
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{
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return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
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e <= QOS_L3_MBM_LOCAL_EVENT_ID);
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}
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struct rdt_parse_data {
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struct rdtgroup *rdtgrp;
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char *buf;
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};
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/**
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* struct rdt_hw_resource - arch private attributes of a resctrl resource
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* @r_resctrl: Attributes of the resource used directly by resctrl.
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* @num_closid: Maximum number of closid this hardware can support,
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* regardless of CDP. This is exposed via
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* resctrl_arch_get_num_closid() to avoid confusion
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* with struct resctrl_schema's property of the same name,
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* which has been corrected for features like CDP.
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* @msr_base: Base MSR address for CBMs
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* @msr_update: Function pointer to update QOS MSRs
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* @mon_scale: cqm counter * mon_scale = occupancy in bytes
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* @mbm_width: Monitor width, to detect and correct for overflow.
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* @cdp_enabled: CDP state of this resource
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*
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* Members of this structure are either private to the architecture
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* e.g. mbm_width, or accessed via helpers that provide abstraction. e.g.
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* msr_update and msr_base.
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*/
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struct rdt_hw_resource {
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struct rdt_resource r_resctrl;
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u32 num_closid;
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unsigned int msr_base;
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void (*msr_update) (struct rdt_domain *d, struct msr_param *m,
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struct rdt_resource *r);
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unsigned int mon_scale;
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unsigned int mbm_width;
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bool cdp_enabled;
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};
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static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r)
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{
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return container_of(r, struct rdt_hw_resource, r_resctrl);
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}
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int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
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struct rdt_domain *d);
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int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
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struct rdt_domain *d);
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extern struct mutex rdtgroup_mutex;
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extern struct rdt_hw_resource rdt_resources_all[];
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extern struct rdtgroup rdtgroup_default;
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DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
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extern struct dentry *debugfs_resctrl;
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enum resctrl_res_level {
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RDT_RESOURCE_L3,
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RDT_RESOURCE_L2,
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RDT_RESOURCE_MBA,
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/* Must be the last */
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RDT_NUM_RESOURCES,
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};
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static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res)
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{
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struct rdt_hw_resource *hw_res = resctrl_to_arch_res(res);
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hw_res++;
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return &hw_res->r_resctrl;
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}
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static inline bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
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{
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return rdt_resources_all[l].cdp_enabled;
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}
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int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
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/*
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* To return the common struct rdt_resource, which is contained in struct
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* rdt_hw_resource, walk the resctrl member of struct rdt_hw_resource.
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*/
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#define for_each_rdt_resource(r) \
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for (r = &rdt_resources_all[0].r_resctrl; \
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r <= &rdt_resources_all[RDT_NUM_RESOURCES - 1].r_resctrl; \
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r = resctrl_inc(r))
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#define for_each_capable_rdt_resource(r) \
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for_each_rdt_resource(r) \
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if (r->alloc_capable || r->mon_capable)
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#define for_each_alloc_capable_rdt_resource(r) \
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for_each_rdt_resource(r) \
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if (r->alloc_capable)
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#define for_each_mon_capable_rdt_resource(r) \
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for_each_rdt_resource(r) \
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if (r->mon_capable)
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#define for_each_alloc_enabled_rdt_resource(r) \
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for_each_rdt_resource(r) \
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if (r->alloc_enabled)
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#define for_each_mon_enabled_rdt_resource(r) \
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for_each_rdt_resource(r) \
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if (r->mon_enabled)
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/* CPUID.(EAX=10H, ECX=ResID=1).EAX */
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union cpuid_0x10_1_eax {
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struct {
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unsigned int cbm_len:5;
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} split;
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unsigned int full;
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};
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/* CPUID.(EAX=10H, ECX=ResID=3).EAX */
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union cpuid_0x10_3_eax {
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struct {
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unsigned int max_delay:12;
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} split;
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unsigned int full;
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};
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/* CPUID.(EAX=10H, ECX=ResID).EDX */
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union cpuid_0x10_x_edx {
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struct {
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unsigned int cos_max:16;
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} split;
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unsigned int full;
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};
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void rdt_last_cmd_clear(void);
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void rdt_last_cmd_puts(const char *s);
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__printf(1, 2)
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void rdt_last_cmd_printf(const char *fmt, ...);
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void rdt_ctrl_update(void *arg);
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struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn);
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void rdtgroup_kn_unlock(struct kernfs_node *kn);
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int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
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int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
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umode_t mask);
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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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ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
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char *buf, size_t nbytes, loff_t off);
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int rdtgroup_schemata_show(struct kernfs_open_file *of,
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struct seq_file *s, void *v);
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bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
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unsigned long cbm, int closid, bool exclusive);
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unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,
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unsigned long cbm);
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enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
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int rdtgroup_tasks_assigned(struct rdtgroup *r);
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int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
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int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
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bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm);
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bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d);
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int rdt_pseudo_lock_init(void);
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void rdt_pseudo_lock_release(void);
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int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
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void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
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struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);
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int closids_supported(void);
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void closid_free(int closid);
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int alloc_rmid(void);
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void free_rmid(u32 rmid);
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int rdt_get_mon_l3_config(struct rdt_resource *r);
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void mon_event_count(void *info);
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int rdtgroup_mondata_show(struct seq_file *m, void *arg);
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void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
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unsigned int dom_id);
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void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
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struct rdt_domain *d);
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void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
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struct rdt_domain *d, struct rdtgroup *rdtgrp,
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int evtid, int first);
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void mbm_setup_overflow_handler(struct rdt_domain *dom,
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unsigned long delay_ms);
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void mbm_handle_overflow(struct work_struct *work);
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void __init intel_rdt_mbm_apply_quirk(void);
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bool is_mba_sc(struct rdt_resource *r);
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void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm);
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u32 delay_bw_map(unsigned long bw, struct rdt_resource *r);
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void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms);
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void cqm_handle_limbo(struct work_struct *work);
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bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
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void __check_limbo(struct rdt_domain *d, bool force_free);
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void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
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void __init thread_throttle_mode_init(void);
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#endif /* _ASM_X86_RESCTRL_INTERNAL_H */
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