diff options
Diffstat (limited to 'arch/x86/kernel/cpu/resctrl/internal.h')
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/internal.h | 542 |
1 files changed, 542 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h new file mode 100644 index 000000000..0b5c6c76f --- /dev/null +++ b/arch/x86/kernel/cpu/resctrl/internal.h @@ -0,0 +1,542 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_RESCTRL_INTERNAL_H +#define _ASM_X86_RESCTRL_INTERNAL_H + +#include <linux/resctrl.h> +#include <linux/sched.h> +#include <linux/kernfs.h> +#include <linux/fs_context.h> +#include <linux/jump_label.h> + +#define MSR_IA32_L3_QOS_CFG 0xc81 +#define MSR_IA32_L2_QOS_CFG 0xc82 +#define MSR_IA32_L3_CBM_BASE 0xc90 +#define MSR_IA32_L2_CBM_BASE 0xd10 +#define MSR_IA32_MBA_THRTL_BASE 0xd50 +#define MSR_IA32_MBA_BW_BASE 0xc0000200 + +#define MSR_IA32_QM_CTR 0x0c8e +#define MSR_IA32_QM_EVTSEL 0x0c8d + +#define L3_QOS_CDP_ENABLE 0x01ULL + +#define L2_QOS_CDP_ENABLE 0x01ULL + +#define CQM_LIMBOCHECK_INTERVAL 1000 + +#define MBM_CNTR_WIDTH_BASE 24 +#define MBM_OVERFLOW_INTERVAL 1000 +#define MAX_MBA_BW 100u +#define MBA_IS_LINEAR 0x4 +#define MAX_MBA_BW_AMD 0x800 +#define MBM_CNTR_WIDTH_OFFSET_AMD 20 + +#define RMID_VAL_ERROR BIT_ULL(63) +#define RMID_VAL_UNAVAIL BIT_ULL(62) +/* + * With the above fields in use 62 bits remain in MSR_IA32_QM_CTR for + * data to be returned. The counter width is discovered from the hardware + * as an offset from MBM_CNTR_WIDTH_BASE. + */ +#define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE) + + +struct rdt_fs_context { + struct kernfs_fs_context kfc; + bool enable_cdpl2; + bool enable_cdpl3; + bool enable_mba_mbps; +}; + +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); +} + +DECLARE_STATIC_KEY_FALSE(rdt_enable_key); +DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key); + +/** + * struct mon_evt - Entry in the event list of a resource + * @evtid: event id + * @name: name of the event + * @list: entry in &rdt_resource->evt_list + */ +struct mon_evt { + enum resctrl_event_id evtid; + char *name; + struct list_head list; +}; + +/** + * union mon_data_bits - Monitoring details for each event file + * @priv: Used to store monitoring event data in @u + * as kernfs private data + * @rid: Resource id associated with the event file + * @evtid: Event id associated with the event file + * @domid: The domain to which the event file belongs + * @u: Name of the bit fields struct + */ +union mon_data_bits { + void *priv; + struct { + unsigned int rid : 10; + enum resctrl_event_id evtid : 8; + unsigned int domid : 14; + } u; +}; + +struct rmid_read { + struct rdtgroup *rgrp; + struct rdt_resource *r; + struct rdt_domain *d; + enum resctrl_event_id evtid; + bool first; + int err; + u64 val; +}; + +extern bool rdt_alloc_capable; +extern bool rdt_mon_capable; +extern unsigned int rdt_mon_features; +extern struct list_head resctrl_schema_all; + +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 pseudo_lock_region - pseudo-lock region information + * @s: Resctrl schema for the resource to which this + * pseudo-locked region belongs + * @d: RDT domain to which this pseudo-locked region + * belongs + * @cbm: bitmask of the pseudo-locked region + * @lock_thread_wq: waitqueue used to wait on the pseudo-locking thread + * completion + * @thread_done: variable used by waitqueue to test if pseudo-locking + * thread completed + * @cpu: core associated with the cache on which the setup code + * will be run + * @line_size: size of the cache lines + * @size: size of pseudo-locked region in bytes + * @kmem: the kernel memory associated with pseudo-locked region + * @minor: minor number of character device associated with this + * region + * @debugfs_dir: pointer to this region's directory in the debugfs + * filesystem + * @pm_reqs: Power management QoS requests related to this region + */ +struct pseudo_lock_region { + struct resctrl_schema *s; + struct rdt_domain *d; + u32 cbm; + wait_queue_head_t lock_thread_wq; + int thread_done; + int cpu; + unsigned int line_size; + unsigned int size; + void *kmem; + unsigned int minor; + struct dentry *debugfs_dir; + struct list_head pm_reqs; +}; + +/** + * 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 + * @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; + 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 RF_CTRLSHIFT 4 +#define RF_MONSHIFT 5 +#define RF_TOPSHIFT 6 +#define RFTYPE_CTRL BIT(RF_CTRLSHIFT) +#define RFTYPE_MON BIT(RF_MONSHIFT) +#define RFTYPE_TOP BIT(RF_TOPSHIFT) +#define RFTYPE_RES_CACHE BIT(8) +#define RFTYPE_RES_MB BIT(9) +#define RF_CTRL_INFO (RFTYPE_INFO | RFTYPE_CTRL) +#define RF_MON_INFO (RFTYPE_INFO | RFTYPE_MON) +#define RF_TOP_INFO (RFTYPE_INFO | RFTYPE_TOP) +#define RF_CTRL_BASE (RFTYPE_BASE | RFTYPE_CTRL) + +/* List of all resource groups */ +extern struct list_head rdt_all_groups; + +extern int max_name_width, max_data_width; + +int __init rdtgroup_init(void); +void __exit rdtgroup_exit(void); + +/** + * 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 RF_* or 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 + * @delta_bw: Difference between the current and previous bandwidth + * @delta_comp: Indicates whether to compute the delta_bw + */ +struct mbm_state { + u64 prev_bw_bytes; + u32 prev_bw; + u32 delta_bw; + bool delta_comp; +}; + +/** + * struct arch_mbm_state - values used to compute resctrl_arch_rmid_read()s + * return value. + * @chunks: Total data moved (multiply by rdt_group.mon_scale to get bytes) + * @prev_msr: Value of IA32_QM_CTR last time it was read for the RMID used to + * find this struct. + */ +struct arch_mbm_state { + u64 chunks; + u64 prev_msr; +}; + +/** + * struct rdt_hw_domain - Arch private attributes of a set of CPUs that share + * a resource + * @d_resctrl: Properties exposed to the resctrl file system + * @ctrl_val: array of cache or mem ctrl values (indexed by CLOSID) + * @arch_mbm_total: arch private state for MBM total bandwidth + * @arch_mbm_local: arch private state for MBM local bandwidth + * + * Members of this structure are accessed via helpers that provide abstraction. + */ +struct rdt_hw_domain { + struct rdt_domain d_resctrl; + u32 *ctrl_val; + struct arch_mbm_state *arch_mbm_total; + struct arch_mbm_state *arch_mbm_local; +}; + +static inline struct rdt_hw_domain *resctrl_to_arch_dom(struct rdt_domain *r) +{ + return container_of(r, struct rdt_hw_domain, d_resctrl); +} + +/** + * struct msr_param - set a range of MSRs from a domain + * @res: The resource to use + * @low: Beginning index from base MSR + * @high: End index + */ +struct msr_param { + struct rdt_resource *res; + u32 low; + u32 high; +}; + +static inline bool is_llc_occupancy_enabled(void) +{ + return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID)); +} + +static inline bool is_mbm_total_enabled(void) +{ + return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID)); +} + +static inline bool is_mbm_local_enabled(void) +{ + return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID)); +} + +static inline bool is_mbm_enabled(void) +{ + return (is_mbm_total_enabled() || is_mbm_local_enabled()); +} + +static inline bool is_mbm_event(int e) +{ + return (e >= QOS_L3_MBM_TOTAL_EVENT_ID && + e <= QOS_L3_MBM_LOCAL_EVENT_ID); +} + +struct rdt_parse_data { + struct rdtgroup *rdtgrp; + char *buf; +}; + +/** + * struct rdt_hw_resource - arch private attributes of a resctrl resource + * @r_resctrl: Attributes of the resource used directly by resctrl. + * @num_closid: Maximum number of closid this hardware can support, + * regardless of CDP. This is exposed via + * resctrl_arch_get_num_closid() to avoid confusion + * with struct resctrl_schema's property of the same name, + * which has been corrected for features like CDP. + * @msr_base: Base MSR address for CBMs + * @msr_update: Function pointer to update QOS MSRs + * @mon_scale: cqm counter * mon_scale = occupancy in bytes + * @mbm_width: Monitor width, to detect and correct for overflow. + * @cdp_enabled: CDP state of this resource + * + * Members of this structure are either private to the architecture + * e.g. mbm_width, or accessed via helpers that provide abstraction. e.g. + * msr_update and msr_base. + */ +struct rdt_hw_resource { + struct rdt_resource r_resctrl; + u32 num_closid; + unsigned int msr_base; + void (*msr_update) (struct rdt_domain *d, struct msr_param *m, + struct rdt_resource *r); + unsigned int mon_scale; + unsigned int mbm_width; + bool cdp_enabled; +}; + +static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r) +{ + return container_of(r, struct rdt_hw_resource, r_resctrl); +} + +int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s, + struct rdt_domain *d); +int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s, + struct rdt_domain *d); + +extern struct mutex rdtgroup_mutex; + +extern struct rdt_hw_resource rdt_resources_all[]; +extern struct rdtgroup rdtgroup_default; +DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key); + +extern struct dentry *debugfs_resctrl; + +enum resctrl_res_level { + RDT_RESOURCE_L3, + RDT_RESOURCE_L2, + RDT_RESOURCE_MBA, + + /* Must be the last */ + RDT_NUM_RESOURCES, +}; + +static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res) +{ + struct rdt_hw_resource *hw_res = resctrl_to_arch_res(res); + + hw_res++; + return &hw_res->r_resctrl; +} + +static inline bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l) +{ + return rdt_resources_all[l].cdp_enabled; +} + +int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable); + +/* + * To return the common struct rdt_resource, which is contained in struct + * rdt_hw_resource, walk the resctrl member of struct rdt_hw_resource. + */ +#define for_each_rdt_resource(r) \ + for (r = &rdt_resources_all[0].r_resctrl; \ + r <= &rdt_resources_all[RDT_NUM_RESOURCES - 1].r_resctrl; \ + r = resctrl_inc(r)) + +#define for_each_capable_rdt_resource(r) \ + for_each_rdt_resource(r) \ + if (r->alloc_capable || r->mon_capable) + +#define for_each_alloc_capable_rdt_resource(r) \ + for_each_rdt_resource(r) \ + if (r->alloc_capable) + +#define for_each_mon_capable_rdt_resource(r) \ + for_each_rdt_resource(r) \ + if (r->mon_capable) + +/* CPUID.(EAX=10H, ECX=ResID=1).EAX */ +union cpuid_0x10_1_eax { + struct { + unsigned int cbm_len:5; + } split; + unsigned int full; +}; + +/* CPUID.(EAX=10H, ECX=ResID=3).EAX */ +union cpuid_0x10_3_eax { + struct { + unsigned int max_delay:12; + } split; + unsigned int full; +}; + +/* CPUID.(EAX=10H, ECX=ResID).EDX */ +union cpuid_0x10_x_edx { + struct { + unsigned int cos_max:16; + } split; + unsigned int full; +}; + +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, ...); + +void rdt_ctrl_update(void *arg); +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); +struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id, + struct list_head **pos); +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); +bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d, + unsigned long cbm, int closid, bool exclusive); +unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d, + unsigned long cbm); +enum rdtgrp_mode rdtgroup_mode_by_closid(int closid); +int rdtgroup_tasks_assigned(struct rdtgroup *r); +int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp); +int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp); +bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm); +bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_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); +struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r); +int closids_supported(void); +void closid_free(int closid); +int alloc_rmid(void); +void free_rmid(u32 rmid); +int rdt_get_mon_l3_config(struct rdt_resource *r); +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_domain *d, struct rdtgroup *rdtgrp, + int evtid, int first); +void mbm_setup_overflow_handler(struct rdt_domain *dom, + unsigned long delay_ms); +void mbm_handle_overflow(struct work_struct *work); +void __init intel_rdt_mbm_apply_quirk(void); +bool is_mba_sc(struct rdt_resource *r); +void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms); +void cqm_handle_limbo(struct work_struct *work); +bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d); +void __check_limbo(struct rdt_domain *d, bool force_free); +void rdt_domain_reconfigure_cdp(struct rdt_resource *r); +void __init thread_throttle_mode_init(void); +void rdt_staged_configs_clear(void); + +#endif /* _ASM_X86_RESCTRL_INTERNAL_H */ |