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-rw-r--r--arch/x86/kernel/cpu/intel_rdt.h570
1 files changed, 570 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h
new file mode 100644
index 000000000..8412234ea
--- /dev/null
+++ b/arch/x86/kernel/cpu/intel_rdt.h
@@ -0,0 +1,570 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_INTEL_RDT_H
+#define _ASM_X86_INTEL_RDT_H
+
+#include <linux/sched.h>
+#include <linux/kernfs.h>
+#include <linux/jump_label.h>
+
+#define IA32_L3_QOS_CFG 0xc81
+#define IA32_L2_QOS_CFG 0xc82
+#define IA32_L3_CBM_BASE 0xc90
+#define IA32_L2_CBM_BASE 0xd10
+#define IA32_MBA_THRTL_BASE 0xd50
+
+#define L3_QOS_CDP_ENABLE 0x01ULL
+
+#define L2_QOS_CDP_ENABLE 0x01ULL
+
+/*
+ * Event IDs are used to program IA32_QM_EVTSEL before reading event
+ * counter from IA32_QM_CTR
+ */
+#define QOS_L3_OCCUP_EVENT_ID 0x01
+#define QOS_L3_MBM_TOTAL_EVENT_ID 0x02
+#define QOS_L3_MBM_LOCAL_EVENT_ID 0x03
+
+#define CQM_LIMBOCHECK_INTERVAL 1000
+
+#define MBM_CNTR_WIDTH 24
+#define MBM_OVERFLOW_INTERVAL 1000
+#define MAX_MBA_BW 100u
+
+#define RMID_VAL_ERROR BIT_ULL(63)
+#define RMID_VAL_UNAVAIL BIT_ULL(62)
+
+DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
+
+/**
+ * struct mon_evt - Entry in the event list of a resource
+ * @evtid: event id
+ * @name: name of the event
+ */
+struct mon_evt {
+ u32 evtid;
+ char *name;
+ struct list_head list;
+};
+
+/**
+ * struct mon_data_bits - Monitoring details for each event file
+ * @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
+ */
+union mon_data_bits {
+ void *priv;
+ struct {
+ unsigned int rid : 10;
+ unsigned int evtid : 8;
+ unsigned int domid : 14;
+ } u;
+};
+
+struct rmid_read {
+ struct rdtgroup *rgrp;
+ struct rdt_domain *d;
+ int evtid;
+ bool first;
+ u64 val;
+};
+
+extern unsigned int intel_cqm_threshold;
+extern bool rdt_alloc_capable;
+extern bool rdt_mon_capable;
+extern unsigned int rdt_mon_features;
+
+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
+ *
+ * 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 kernlfs 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
+ * @r: RDT 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 rdt_resource *r;
+ 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;
+ 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
+ * @chunks: Total data moved (multiply by rdt_group.mon_scale to get bytes)
+ * @prev_msr Value of IA32_QM_CTR for this RMID last time we read it
+ * @prev_bw_msr:Value of previous IA32_QM_CTR for bandwidth counting
+ * @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 chunks;
+ u64 prev_msr;
+ u64 prev_bw_msr;
+ u32 prev_bw;
+ u32 delta_bw;
+ bool delta_comp;
+};
+
+/**
+ * struct rdt_domain - group of cpus sharing an RDT resource
+ * @list: all instances of this resource
+ * @id: unique id for this instance
+ * @cpu_mask: which cpus share this resource
+ * @rmid_busy_llc:
+ * bitmap of which limbo RMIDs are above threshold
+ * @mbm_total: saved state for MBM total bandwidth
+ * @mbm_local: saved state for MBM local bandwidth
+ * @mbm_over: worker to periodically read MBM h/w counters
+ * @cqm_limbo: worker to periodically read CQM h/w counters
+ * @mbm_work_cpu:
+ * worker cpu for MBM h/w counters
+ * @cqm_work_cpu:
+ * worker cpu for CQM h/w counters
+ * @ctrl_val: array of cache or mem ctrl values (indexed by CLOSID)
+ * @mbps_val: When mba_sc is enabled, this holds the bandwidth in MBps
+ * @new_ctrl: new ctrl value to be loaded
+ * @have_new_ctrl: did user provide new_ctrl for this domain
+ * @plr: pseudo-locked region (if any) associated with domain
+ */
+struct rdt_domain {
+ struct list_head list;
+ int id;
+ struct cpumask cpu_mask;
+ unsigned long *rmid_busy_llc;
+ struct mbm_state *mbm_total;
+ struct mbm_state *mbm_local;
+ struct delayed_work mbm_over;
+ struct delayed_work cqm_limbo;
+ int mbm_work_cpu;
+ int cqm_work_cpu;
+ u32 *ctrl_val;
+ u32 *mbps_val;
+ u32 new_ctrl;
+ bool have_new_ctrl;
+ struct pseudo_lock_region *plr;
+};
+
+/**
+ * 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;
+ int low;
+ int high;
+};
+
+/**
+ * struct rdt_cache - Cache allocation related data
+ * @cbm_len: Length of the cache bit mask
+ * @min_cbm_bits: Minimum number of consecutive bits to be set
+ * @cbm_idx_mult: Multiplier of CBM index
+ * @cbm_idx_offset: Offset of CBM index. CBM index is computed by:
+ * closid * cbm_idx_multi + cbm_idx_offset
+ * in a cache bit mask
+ * @shareable_bits: Bitmask of shareable resource with other
+ * executing entities
+ */
+struct rdt_cache {
+ unsigned int cbm_len;
+ unsigned int min_cbm_bits;
+ unsigned int cbm_idx_mult;
+ unsigned int cbm_idx_offset;
+ unsigned int shareable_bits;
+};
+
+/**
+ * struct rdt_membw - Memory bandwidth allocation related data
+ * @max_delay: Max throttle delay. Delay is the hardware
+ * representation for memory bandwidth.
+ * @min_bw: Minimum memory bandwidth percentage user can request
+ * @bw_gran: Granularity at which the memory bandwidth is allocated
+ * @delay_linear: True if memory B/W delay is in linear scale
+ * @mba_sc: True if MBA software controller(mba_sc) is enabled
+ * @mb_map: Mapping of memory B/W percentage to memory B/W delay
+ */
+struct rdt_membw {
+ u32 max_delay;
+ u32 min_bw;
+ u32 bw_gran;
+ u32 delay_linear;
+ bool mba_sc;
+ u32 *mb_map;
+};
+
+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_resource - attributes of an RDT resource
+ * @rid: The index of the resource
+ * @alloc_enabled: Is allocation enabled on this machine
+ * @mon_enabled: Is monitoring enabled for this feature
+ * @alloc_capable: Is allocation available on this machine
+ * @mon_capable: Is monitor feature available on this machine
+ * @name: Name to use in "schemata" file
+ * @num_closid: Number of CLOSIDs available
+ * @cache_level: Which cache level defines scope of this resource
+ * @default_ctrl: Specifies default cache cbm or memory B/W percent.
+ * @msr_base: Base MSR address for CBMs
+ * @msr_update: Function pointer to update QOS MSRs
+ * @data_width: Character width of data when displaying
+ * @domains: All domains for this resource
+ * @cache: Cache allocation related data
+ * @format_str: Per resource format string to show domain value
+ * @parse_ctrlval: Per resource function pointer to parse control values
+ * @evt_list: List of monitoring events
+ * @num_rmid: Number of RMIDs available
+ * @mon_scale: cqm counter * mon_scale = occupancy in bytes
+ * @fflags: flags to choose base and info files
+ */
+struct rdt_resource {
+ int rid;
+ bool alloc_enabled;
+ bool mon_enabled;
+ bool alloc_capable;
+ bool mon_capable;
+ char *name;
+ int num_closid;
+ int cache_level;
+ u32 default_ctrl;
+ unsigned int msr_base;
+ void (*msr_update) (struct rdt_domain *d, struct msr_param *m,
+ struct rdt_resource *r);
+ int data_width;
+ struct list_head domains;
+ struct rdt_cache cache;
+ struct rdt_membw membw;
+ const char *format_str;
+ int (*parse_ctrlval)(struct rdt_parse_data *data,
+ struct rdt_resource *r,
+ struct rdt_domain *d);
+ struct list_head evt_list;
+ int num_rmid;
+ unsigned int mon_scale;
+ unsigned long fflags;
+};
+
+int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
+ struct rdt_domain *d);
+int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
+ struct rdt_domain *d);
+
+extern struct mutex rdtgroup_mutex;
+
+extern struct rdt_resource rdt_resources_all[];
+extern struct rdtgroup rdtgroup_default;
+DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
+
+extern struct dentry *debugfs_resctrl;
+
+enum {
+ RDT_RESOURCE_L3,
+ RDT_RESOURCE_L3DATA,
+ RDT_RESOURCE_L3CODE,
+ RDT_RESOURCE_L2,
+ RDT_RESOURCE_L2DATA,
+ RDT_RESOURCE_L2CODE,
+ RDT_RESOURCE_MBA,
+
+ /* Must be the last */
+ RDT_NUM_RESOURCES,
+};
+
+#define for_each_capable_rdt_resource(r) \
+ for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
+ r++) \
+ if (r->alloc_capable || r->mon_capable)
+
+#define for_each_alloc_capable_rdt_resource(r) \
+ for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
+ r++) \
+ if (r->alloc_capable)
+
+#define for_each_mon_capable_rdt_resource(r) \
+ for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
+ r++) \
+ if (r->mon_capable)
+
+#define for_each_alloc_enabled_rdt_resource(r) \
+ for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
+ r++) \
+ if (r->alloc_enabled)
+
+#define for_each_mon_enabled_rdt_resource(r) \
+ for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
+ r++) \
+ if (r->mon_enabled)
+
+/* 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);
+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 rdt_resource *r, 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 update_domains(struct rdt_resource *r, int closid);
+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 rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
+ unsigned int dom_id);
+void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
+ struct rdt_domain *d);
+void mon_event_read(struct rmid_read *rr, 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);
+bool is_mba_sc(struct rdt_resource *r);
+void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm);
+u32 delay_bw_map(unsigned long bw, 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);
+
+#endif /* _ASM_X86_INTEL_RDT_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 09:35:48 +0000