Quelle internal.h
Sprache: C
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _FS_RESCTRL_INTERNAL_H
#define _FS_RESCTRL_INTERNAL_H
#include <linux/resctrl.h>
#include <linux/kernfs.h>
#include <linux/fs_context.h>
#include <linux/tick.h>
#define CQM_LIMBOCHECK_INTERVAL 1000
/**
* cpumask_any_housekeeping ( ) - Choose any CPU in @ mask , preferring those that
* aren ' t marked nohz_full
* @ mask : The mask to pick a CPU from .
* @ exclude_cpu : The CPU to avoid picking .
*
* Returns a CPU from @ mask , but not @ exclude_cpu . If there are housekeeping
* CPUs that don ' t use nohz_full , these are preferred . Pass
* RESCTRL_PICK_ANY_CPU to avoid excluding any CPUs .
*
* When a CPU is excluded , returns > = nr_cpu_ids if no CPUs are available .
*/
static inline unsigned int
cpumask_any_housekeeping(const struct cpumask *mask, int exclude_cpu)
{
unsigned int cpu;
/* Try to find a CPU that isn't nohz_full to use in preference */
if (tick_nohz_full_enabled()) {
cpu = cpumask_any_andnot_but(mask, tick_nohz_full_mask, exclude_cpu);
if (cpu < nr_cpu_ids)
return cpu;
}
return cpumask_any_but(mask, exclude_cpu);
}
struct rdt_fs_context {
struct kernfs_fs_context kfc;
bool enable_cdpl2;
bool enable_cdpl3;
bool enable_mba_mbps;
bool enable_debug;
};
static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
{
struct kernfs_fs_context *kfc = fc->fs_private;
return container_of(kfc, struct rdt_fs_context, kfc);
}
/**
* struct mon_evt - Entry in the event list of a resource
* @ evtid : event id
* @ name : name of the event
* @ configurable : true if the event is configurable
* @ list : entry in & rdt_resource - > evt_list
*/
struct mon_evt {
enum resctrl_event_id evtid;
char *name;
bool configurable;
struct list_head list;
};
/**
* struct mon_data - Monitoring details for each event file .
* @ list : Member of the global @ mon_data_kn_priv_list list .
* @ rid : Resource id associated with the event file .
* @ evtid : Event id associated with the event file .
* @ sum : Set when event must be summed across multiple
* domains .
* @ domid : When @ sum is zero this is the domain to which
* the event file belongs . When @ sum is one this
* is the id of the L3 cache that all domains to be
* summed share .
*
* Pointed to by the kernfs kn - > priv field of monitoring event files .
* Readers and writers must hold rdtgroup_mutex .
*/
struct mon_data {
struct list_head list;
enum resctrl_res_level rid;
enum resctrl_event_id evtid;
int domid;
bool sum;
};
/**
* struct rmid_read - Data passed across smp_call * ( ) to read event count .
* @ rgrp : Resource group for which the counter is being read . If it is a parent
* resource group then its event count is summed with the count from all
* its child resource groups .
* @ r : Resource describing the properties of the event being read .
* @ d : Domain that the counter should be read from . If NULL then sum all
* domains in @ r sharing L3 @ ci . id
* @ evtid : Which monitor event to read .
* @ first : Initialize MBM counter when true .
* @ ci : Cacheinfo for L3 . Only set when @ d is NULL . Used when summing domains .
* @ err : Error encountered when reading counter .
* @ val : Returned value of event counter . If @ rgrp is a parent resource group ,
* @ val includes the sum of event counts from its child resource groups .
* If @ d is NULL , @ val includes the sum of all domains in @ r sharing @ ci . id ,
* ( summed across child resource groups if @ rgrp is a parent resource group ) .
* @ arch_mon_ctx : Hardware monitor allocated for this read request ( MPAM only ) .
*/
struct rmid_read {
struct rdtgroup *rgrp;
struct rdt_resource *r;
struct rdt_mon_domain *d;
enum resctrl_event_id evtid;
bool first;
struct cacheinfo *ci;
int err;
u64 val;
void *arch_mon_ctx;
};
extern struct list_head resctrl_schema_all;
extern bool resctrl_mounted;
enum rdt_group_type {
RDTCTRL_GROUP = 0 ,
RDTMON_GROUP,
RDT_NUM_GROUP,
};
/**
* enum rdtgrp_mode - Mode of a RDT resource group
* @ RDT_MODE_SHAREABLE : This resource group allows sharing of its allocations
* @ RDT_MODE_EXCLUSIVE : No sharing of this resource group ' s allocations allowed
* @ RDT_MODE_PSEUDO_LOCKSETUP : Resource group will be used for Pseudo - Locking
* @ RDT_MODE_PSEUDO_LOCKED : No sharing of this resource group ' s allocations
* allowed AND the allocations are Cache Pseudo - Locked
* @ RDT_NUM_MODES : Total number of modes
*
* The mode of a resource group enables control over the allowed overlap
* between allocations associated with different resource groups ( classes
* of service ) . User is able to modify the mode of a resource group by
* writing to the " mode " resctrl file associated with the resource group .
*
* The " shareable " , " exclusive " , and " pseudo - locksetup " modes are set by
* writing the appropriate text to the " mode " file . A resource group enters
* " pseudo - locked " mode after the schemata is written while the resource
* group is in " pseudo - locksetup " mode .
*/
enum rdtgrp_mode {
RDT_MODE_SHAREABLE = 0 ,
RDT_MODE_EXCLUSIVE,
RDT_MODE_PSEUDO_LOCKSETUP,
RDT_MODE_PSEUDO_LOCKED,
/* Must be last */
RDT_NUM_MODES,
};
/**
* struct mongroup - store mon group ' s data in resctrl fs .
* @ mon_data_kn : kernfs node for the mon_data directory
* @ parent : parent rdtgrp
* @ crdtgrp_list : child rdtgroup node list
* @ rmid : rmid for this rdtgroup
*/
struct mongroup {
struct kernfs_node *mon_data_kn;
struct rdtgroup *parent;
struct list_head crdtgrp_list;
u32 rmid;
};
/**
* struct rdtgroup - store rdtgroup ' s data in resctrl file system .
* @ kn : kernfs node
* @ rdtgroup_list : linked list for all rdtgroups
* @ closid : closid for this rdtgroup
* @ cpu_mask : CPUs assigned to this rdtgroup
* @ flags : status bits
* @ waitcount : how many cpus expect to find this
* group when they acquire rdtgroup_mutex
* @ type : indicates type of this rdtgroup - either
* monitor only or ctrl_mon group
* @ mon : mongroup related data
* @ mode : mode of resource group
* @ mba_mbps_event : input monitoring event id when mba_sc is enabled
* @ plr : pseudo - locked region
*/
struct rdtgroup {
struct kernfs_node *kn;
struct list_head rdtgroup_list;
u32 closid;
struct cpumask cpu_mask;
int flags;
atomic_t waitcount;
enum rdt_group_type type;
struct mongroup mon;
enum rdtgrp_mode mode;
enum resctrl_event_id mba_mbps_event;
struct pseudo_lock_region *plr;
};
/* rdtgroup.flags */
#define RDT_DELETED 1
/* rftype.flags */
#define RFTYPE_FLAGS_CPUS_LIST 1
/*
* Define the file type flags for base and info directories .
*/
#define RFTYPE_INFO BIT(0 )
#define RFTYPE_BASE BIT(1 )
#define RFTYPE_CTRL BIT(4 )
#define RFTYPE_MON BIT(5 )
#define RFTYPE_TOP BIT(6 )
#define RFTYPE_RES_CACHE BIT(8 )
#define RFTYPE_RES_MB BIT(9 )
#define RFTYPE_DEBUG BIT(10 )
#define RFTYPE_CTRL_INFO (RFTYPE_INFO | RFTYPE_CTRL)
#define RFTYPE_MON_INFO (RFTYPE_INFO | RFTYPE_MON)
#define RFTYPE_TOP_INFO (RFTYPE_INFO | RFTYPE_TOP)
#define RFTYPE_CTRL_BASE (RFTYPE_BASE | RFTYPE_CTRL)
#define RFTYPE_MON_BASE (RFTYPE_BASE | RFTYPE_MON)
/* List of all resource groups */
extern struct list_head rdt_all_groups;
extern int max_name_width;
/**
* struct rftype - describe each file in the resctrl file system
* @ name : File name
* @ mode : Access mode
* @ kf_ops : File operations
* @ flags : File specific RFTYPE_FLAGS_ * flags
* @ fflags : File specific RFTYPE_ * flags
* @ seq_show : Show content of the file
* @ write : Write to the file
*/
struct rftype {
char *name;
umode_t mode;
const struct kernfs_ops *kf_ops;
unsigned long flags;
unsigned long fflags;
int (*seq_show)(struct kernfs_open_file *of,
struct seq_file *sf, void *v);
/*
* write ( ) is the generic write callback which maps directly to
* kernfs write operation and overrides all other operations .
* Maximum write size is determined by - > max_write_len .
*/
ssize_t (*write)(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off);
};
/**
* struct mbm_state - status for each MBM counter in each domain
* @ prev_bw_bytes : Previous bytes value read for bandwidth calculation
* @ prev_bw : The most recent bandwidth in MBps
*/
struct mbm_state {
u64 prev_bw_bytes;
u32 prev_bw;
};
extern struct mutex rdtgroup_mutex;
static inline const char *rdt_kn_name(const struct kernfs_node *kn)
{
return rcu_dereference_check(kn->name, lockdep_is_held(&rdtgroup_mutex));
}
extern struct rdtgroup rdtgroup_default;
extern struct dentry *debugfs_resctrl;
extern enum resctrl_event_id mba_mbps_default_event;
void rdt_last_cmd_clear(void );
void rdt_last_cmd_puts(const char *s);
__printf(1 , 2 )
void rdt_last_cmd_printf(const char *fmt, ...);
struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn);
void rdtgroup_kn_unlock(struct kernfs_node *kn);
int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
umode_t mask);
ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off);
int rdtgroup_schemata_show(struct kernfs_open_file *of,
struct seq_file *s, void *v);
ssize_t rdtgroup_mba_mbps_event_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off);
int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
struct seq_file *s, void *v);
bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_ctrl_domain *d,
unsigned long cbm, int closid, bool exclusive);
unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_ctrl_domain *d,
unsigned long cbm);
enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
int rdtgroup_tasks_assigned(struct rdtgroup *r);
int closids_supported(void );
void closid_free(int closid);
int alloc_rmid(u32 closid);
void free_rmid(u32 closid, u32 rmid);
void resctrl_mon_resource_exit(void );
void mon_event_count(void *info);
int rdtgroup_mondata_show(struct seq_file *m, void *arg);
void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
cpumask_t *cpumask, int evtid, int first);
int resctrl_mon_resource_init(void );
void mbm_setup_overflow_handler(struct rdt_mon_domain *dom,
unsigned long delay_ms,
int exclude_cpu);
void mbm_handle_overflow(struct work_struct *work);
bool is_mba_sc(struct rdt_resource *r);
void cqm_setup_limbo_handler(struct rdt_mon_domain *dom, unsigned long delay_ms,
int exclude_cpu);
void cqm_handle_limbo(struct work_struct *work);
bool has_busy_rmid(struct rdt_mon_domain *d);
void __check_limbo(struct rdt_mon_domain *d, bool force_free);
void resctrl_file_fflags_init(const char *config, unsigned long fflags);
void rdt_staged_configs_clear(void );
bool closid_allocated(unsigned int closid);
int resctrl_find_cleanest_closid(void );
#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm);
bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d);
int rdt_pseudo_lock_init(void );
void rdt_pseudo_lock_release(void );
int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
#else
static inline int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
{
return -EOPNOTSUPP;
}
static inline int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
{
return -EOPNOTSUPP;
}
static inline bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm)
{
return false ;
}
static inline bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d)
{
return false ;
}
static inline int rdt_pseudo_lock_init(void ) { return 0 ; }
static inline void rdt_pseudo_lock_release(void ) { }
static inline int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
{
return -EOPNOTSUPP;
}
static inline void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp) { }
#endif /* CONFIG_RESCTRL_FS_PSEUDO_LOCK */
#endif /* _FS_RESCTRL_INTERNAL_H */
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(vorverarbeitet am 2026-09-29)
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*© Formatika GbR, Deutschland
2026-10-10
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