arch/x86/kernel/cpu/intel_rdt.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_INTEL_RDT_H
   3 #define _ASM_X86_INTEL_RDT_H
   4
   5 #include <linux/sched.h>
   6 #include <linux/kernfs.h>
   7 #include <linux/jump_label.h>
   8
   9 #define IA32_L3_QOS_CFG         0xc81
  10 #define IA32_L3_CBM_BASE        0xc90
  11 #define IA32_L2_CBM_BASE        0xd10
  12 #define IA32_MBA_THRTL_BASE     0xd50
  13
  14 #define L3_QOS_CDP_ENABLE       0x01ULL
  15
  16 /*
  17  * Event IDs are used to program IA32_QM_EVTSEL before reading event
  18  * counter from IA32_QM_CTR
  19  */
  20 #define QOS_L3_OCCUP_EVENT_ID           0x01
  21 #define QOS_L3_MBM_TOTAL_EVENT_ID       0x02
  22 #define QOS_L3_MBM_LOCAL_EVENT_ID       0x03
  23
  24 #define CQM_LIMBOCHECK_INTERVAL 1000
  25
  26 #define MBM_CNTR_WIDTH                  24
  27 #define MBM_OVERFLOW_INTERVAL           1000
  28
  29 #define RMID_VAL_ERROR                  BIT_ULL(63)
  30 #define RMID_VAL_UNAVAIL                BIT_ULL(62)
  31
  32 DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
  33
  34 /**
  35  * struct mon_evt - Entry in the event list of a resource
  36  * @evtid:              event id
  37  * @name:               name of the event
  38  */
  39 struct mon_evt {
  40         u32                     evtid;
  41         char                    *name;
  42         struct list_head        list;
  43 };
  44
  45 /**
  46  * struct mon_data_bits - Monitoring details for each event file
  47  * @rid:               Resource id associated with the event file.
  48  * @evtid:             Event id associated with the event file
  49  * @domid:             The domain to which the event file belongs
  50  */
  51 union mon_data_bits {
  52         void *priv;
  53         struct {
  54                 unsigned int rid        : 10;
  55                 unsigned int evtid      : 8;
  56                 unsigned int domid      : 14;
  57         } u;
  58 };
  59
  60 struct rmid_read {
  61         struct rdtgroup         *rgrp;
  62         struct rdt_domain       *d;
  63         int                     evtid;
  64         bool                    first;
  65         u64                     val;
  66 };
  67
  68 extern unsigned int intel_cqm_threshold;
  69 extern bool rdt_alloc_capable;
  70 extern bool rdt_mon_capable;
  71 extern unsigned int rdt_mon_features;
  72
  73 enum rdt_group_type {
  74         RDTCTRL_GROUP = 0,
  75         RDTMON_GROUP,
  76         RDT_NUM_GROUP,
  77 };
  78
  79 /**
  80  * struct mongroup - store mon group's data in resctrl fs.
  81  * @mon_data_kn         kernlfs node for the mon_data directory
  82  * @parent:                     parent rdtgrp
  83  * @crdtgrp_list:               child rdtgroup node list
  84  * @rmid:                       rmid for this rdtgroup
  85  */
  86 struct mongroup {
  87         struct kernfs_node      *mon_data_kn;
  88         struct rdtgroup         *parent;
  89         struct list_head        crdtgrp_list;
  90         u32                     rmid;
  91 };
  92
  93 /**
  94  * struct rdtgroup - store rdtgroup's data in resctrl file system.
  95  * @kn:                         kernfs node
  96  * @rdtgroup_list:              linked list for all rdtgroups
  97  * @closid:                     closid for this rdtgroup
  98  * @cpu_mask:                   CPUs assigned to this rdtgroup
  99  * @flags:                      status bits
 100  * @waitcount:                  how many cpus expect to find this
 101  *                              group when they acquire rdtgroup_mutex
 102  * @type:                       indicates type of this rdtgroup - either
 103  *                              monitor only or ctrl_mon group
 104  * @mon:                        mongroup related data
 105  */
 106 struct rdtgroup {
 107         struct kernfs_node      *kn;
 108         struct list_head        rdtgroup_list;
 109         u32                     closid;
 110         struct cpumask          cpu_mask;
 111         int                     flags;
 112         atomic_t                waitcount;
 113         enum rdt_group_type     type;
 114         struct mongroup         mon;
 115 };
 116
 117 /* rdtgroup.flags */
 118 #define RDT_DELETED             1
 119
 120 /* rftype.flags */
 121 #define RFTYPE_FLAGS_CPUS_LIST  1
 122
 123 /*
 124  * Define the file type flags for base and info directories.
 125  */
 126 #define RFTYPE_INFO                     BIT(0)
 127 #define RFTYPE_BASE                     BIT(1)
 128 #define RF_CTRLSHIFT                    4
 129 #define RF_MONSHIFT                     5
 130 #define RF_TOPSHIFT                     6
 131 #define RFTYPE_CTRL                     BIT(RF_CTRLSHIFT)
 132 #define RFTYPE_MON                      BIT(RF_MONSHIFT)
 133 #define RFTYPE_TOP                      BIT(RF_TOPSHIFT)
 134 #define RFTYPE_RES_CACHE                BIT(8)
 135 #define RFTYPE_RES_MB                   BIT(9)
 136 #define RF_CTRL_INFO                    (RFTYPE_INFO | RFTYPE_CTRL)
 137 #define RF_MON_INFO                     (RFTYPE_INFO | RFTYPE_MON)
 138 #define RF_TOP_INFO                     (RFTYPE_INFO | RFTYPE_TOP)
 139 #define RF_CTRL_BASE                    (RFTYPE_BASE | RFTYPE_CTRL)
 140
 141 /* List of all resource groups */
 142 extern struct list_head rdt_all_groups;
 143
 144 extern int max_name_width, max_data_width;
 145
 146 int __init rdtgroup_init(void);
 147
 148 /**
 149  * struct rftype - describe each file in the resctrl file system
 150  * @name:       File name
 151  * @mode:       Access mode
 152  * @kf_ops:     File operations
 153  * @flags:      File specific RFTYPE_FLAGS_* flags
 154  * @fflags:     File specific RF_* or RFTYPE_* flags
 155  * @seq_show:   Show content of the file
 156  * @write:      Write to the file
 157  */
 158 struct rftype {
 159         char                    *name;
 160         umode_t                 mode;
 161         struct kernfs_ops       *kf_ops;
 162         unsigned long           flags;
 163         unsigned long           fflags;
 164
 165         int (*seq_show)(struct kernfs_open_file *of,
 166                         struct seq_file *sf, void *v);
 167         /*
 168          * write() is the generic write callback which maps directly to
 169          * kernfs write operation and overrides all other operations.
 170          * Maximum write size is determined by ->max_write_len.
 171          */
 172         ssize_t (*write)(struct kernfs_open_file *of,
 173                          char *buf, size_t nbytes, loff_t off);
 174 };
 175
 176 /**
 177  * struct mbm_state - status for each MBM counter in each domain
 178  * @chunks:     Total data moved (multiply by rdt_group.mon_scale to get bytes)
 179  * @prev_msr    Value of IA32_QM_CTR for this RMID last time we read it
 180  */
 181 struct mbm_state {
 182         u64     chunks;
 183         u64     prev_msr;
 184 };
 185
 186 /**
 187  * struct rdt_domain - group of cpus sharing an RDT resource
 188  * @list:       all instances of this resource
 189  * @id:         unique id for this instance
 190  * @cpu_mask:   which cpus share this resource
 191  * @rmid_busy_llc:
 192  *              bitmap of which limbo RMIDs are above threshold
 193  * @mbm_total:  saved state for MBM total bandwidth
 194  * @mbm_local:  saved state for MBM local bandwidth
 195  * @mbm_over:   worker to periodically read MBM h/w counters
 196  * @cqm_limbo:  worker to periodically read CQM h/w counters
 197  * @mbm_work_cpu:
 198  *              worker cpu for MBM h/w counters
 199  * @cqm_work_cpu:
 200  *              worker cpu for CQM h/w counters
 201  * @ctrl_val:   array of cache or mem ctrl values (indexed by CLOSID)
 202  * @new_ctrl:   new ctrl value to be loaded
 203  * @have_new_ctrl: did user provide new_ctrl for this domain
 204  */
 205 struct rdt_domain {
 206         struct list_head        list;
 207         int                     id;
 208         struct cpumask          cpu_mask;
 209         unsigned long           *rmid_busy_llc;
 210         struct mbm_state        *mbm_total;
 211         struct mbm_state        *mbm_local;
 212         struct delayed_work     mbm_over;
 213         struct delayed_work     cqm_limbo;
 214         int                     mbm_work_cpu;
 215         int                     cqm_work_cpu;
 216         u32                     *ctrl_val;
 217         u32                     new_ctrl;
 218         bool                    have_new_ctrl;
 219 };
 220
 221 /**
 222  * struct msr_param - set a range of MSRs from a domain
 223  * @res:       The resource to use
 224  * @low:       Beginning index from base MSR
 225  * @high:      End index
 226  */
 227 struct msr_param {
 228         struct rdt_resource     *res;
 229         int                     low;
 230         int                     high;
 231 };
 232
 233 /**
 234  * struct rdt_cache - Cache allocation related data
 235  * @cbm_len:            Length of the cache bit mask
 236  * @min_cbm_bits:       Minimum number of consecutive bits to be set
 237  * @cbm_idx_mult:       Multiplier of CBM index
 238  * @cbm_idx_offset:     Offset of CBM index. CBM index is computed by:
 239  *                      closid * cbm_idx_multi + cbm_idx_offset
 240  *                      in a cache bit mask
 241  * @shareable_bits:     Bitmask of shareable resource with other
 242  *                      executing entities
 243  */
 244 struct rdt_cache {
 245         unsigned int    cbm_len;
 246         unsigned int    min_cbm_bits;
 247         unsigned int    cbm_idx_mult;
 248         unsigned int    cbm_idx_offset;
 249         unsigned int    shareable_bits;
 250 };
 251
 252 /**
 253  * struct rdt_membw - Memory bandwidth allocation related data
 254  * @max_delay:          Max throttle delay. Delay is the hardware
 255  *                      representation for memory bandwidth.
 256  * @min_bw:             Minimum memory bandwidth percentage user can request
 257  * @bw_gran:            Granularity at which the memory bandwidth is allocated
 258  * @delay_linear:       True if memory B/W delay is in linear scale
 259  * @mb_map:             Mapping of memory B/W percentage to memory B/W delay
 260  */
 261 struct rdt_membw {
 262         u32             max_delay;
 263         u32             min_bw;
 264         u32             bw_gran;
 265         u32             delay_linear;
 266         u32             *mb_map;
 267 };
 268
 269 static inline bool is_llc_occupancy_enabled(void)
 270 {
 271         return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
 272 }
 273
 274 static inline bool is_mbm_total_enabled(void)
 275 {
 276         return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID));
 277 }
 278
 279 static inline bool is_mbm_local_enabled(void)
 280 {
 281         return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID));
 282 }
 283
 284 static inline bool is_mbm_enabled(void)
 285 {
 286         return (is_mbm_total_enabled() || is_mbm_local_enabled());
 287 }
 288
 289 static inline bool is_mbm_event(int e)
 290 {
 291         return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
 292                 e <= QOS_L3_MBM_LOCAL_EVENT_ID);
 293 }
 294
 295 /**
 296  * struct rdt_resource - attributes of an RDT resource
 297  * @rid:                The index of the resource
 298  * @alloc_enabled:      Is allocation enabled on this machine
 299  * @mon_enabled:                Is monitoring enabled for this feature
 300  * @alloc_capable:      Is allocation available on this machine
 301  * @mon_capable:                Is monitor feature available on this machine
 302  * @name:               Name to use in "schemata" file
 303  * @num_closid:         Number of CLOSIDs available
 304  * @cache_level:        Which cache level defines scope of this resource
 305  * @default_ctrl:       Specifies default cache cbm or memory B/W percent.
 306  * @msr_base:           Base MSR address for CBMs
 307  * @msr_update:         Function pointer to update QOS MSRs
 308  * @data_width:         Character width of data when displaying
 309  * @domains:            All domains for this resource
 310  * @cache:              Cache allocation related data
 311  * @format_str:         Per resource format string to show domain value
 312  * @parse_ctrlval:      Per resource function pointer to parse control values
 313  * @evt_list:                   List of monitoring events
 314  * @num_rmid:                   Number of RMIDs available
 315  * @mon_scale:                  cqm counter * mon_scale = occupancy in bytes
 316  * @fflags:                     flags to choose base and info files
 317  */
 318 struct rdt_resource {
 319         int                     rid;
 320         bool                    alloc_enabled;
 321         bool                    mon_enabled;
 322         bool                    alloc_capable;
 323         bool                    mon_capable;
 324         char                    *name;
 325         int                     num_closid;
 326         int                     cache_level;
 327         u32                     default_ctrl;
 328         unsigned int            msr_base;
 329         void (*msr_update)      (struct rdt_domain *d, struct msr_param *m,
 330                                  struct rdt_resource *r);
 331         int                     data_width;
 332         struct list_head        domains;
 333         struct rdt_cache        cache;
 334         struct rdt_membw        membw;
 335         const char              *format_str;
 336         int (*parse_ctrlval)    (char *buf, struct rdt_resource *r,
 337                                  struct rdt_domain *d);
 338         struct list_head        evt_list;
 339         int                     num_rmid;
 340         unsigned int            mon_scale;
 341         unsigned long           fflags;
 342 };
 343
 344 int parse_cbm(char *buf, struct rdt_resource *r, struct rdt_domain *d);
 345 int parse_bw(char *buf, struct rdt_resource *r,  struct rdt_domain *d);
 346
 347 extern struct mutex rdtgroup_mutex;
 348
 349 extern struct rdt_resource rdt_resources_all[];
 350 extern struct rdtgroup rdtgroup_default;
 351 DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
 352
 353 int __init rdtgroup_init(void);
 354
 355 enum {
 356         RDT_RESOURCE_L3,
 357         RDT_RESOURCE_L3DATA,
 358         RDT_RESOURCE_L3CODE,
 359         RDT_RESOURCE_L2,
 360         RDT_RESOURCE_MBA,
 361
 362         /* Must be the last */
 363         RDT_NUM_RESOURCES,
 364 };
 365
 366 #define for_each_capable_rdt_resource(r)                                      \
 367         for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
 368              r++)                                                             \
 369                 if (r->alloc_capable || r->mon_capable)
 370
 371 #define for_each_alloc_capable_rdt_resource(r)                                \
 372         for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
 373              r++)                                                             \
 374                 if (r->alloc_capable)
 375
 376 #define for_each_mon_capable_rdt_resource(r)                                  \
 377         for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
 378              r++)                                                             \
 379                 if (r->mon_capable)
 380
 381 #define for_each_alloc_enabled_rdt_resource(r)                                \
 382         for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
 383              r++)                                                             \
 384                 if (r->alloc_enabled)
 385
 386 #define for_each_mon_enabled_rdt_resource(r)                                  \
 387         for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
 388              r++)                                                             \
 389                 if (r->mon_enabled)
 390
 391 /* CPUID.(EAX=10H, ECX=ResID=1).EAX */
 392 union cpuid_0x10_1_eax {
 393         struct {
 394                 unsigned int cbm_len:5;
 395         } split;
 396         unsigned int full;
 397 };
 398
 399 /* CPUID.(EAX=10H, ECX=ResID=3).EAX */
 400 union cpuid_0x10_3_eax {
 401         struct {
 402                 unsigned int max_delay:12;
 403         } split;
 404         unsigned int full;
 405 };
 406
 407 /* CPUID.(EAX=10H, ECX=ResID).EDX */
 408 union cpuid_0x10_x_edx {
 409         struct {
 410                 unsigned int cos_max:16;
 411         } split;
 412         unsigned int full;
 413 };
 414
 415 void rdt_last_cmd_clear(void);
 416 void rdt_last_cmd_puts(const char *s);
 417 void rdt_last_cmd_printf(const char *fmt, ...);
 418
 419 void rdt_ctrl_update(void *arg);
 420 struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn);
 421 void rdtgroup_kn_unlock(struct kernfs_node *kn);
 422 struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
 423                                    struct list_head **pos);
 424 ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 425                                 char *buf, size_t nbytes, loff_t off);
 426 int rdtgroup_schemata_show(struct kernfs_open_file *of,
 427                            struct seq_file *s, void *v);
 428 struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);
 429 int alloc_rmid(void);
 430 void free_rmid(u32 rmid);
 431 int rdt_get_mon_l3_config(struct rdt_resource *r);
 432 void mon_event_count(void *info);
 433 int rdtgroup_mondata_show(struct seq_file *m, void *arg);
 434 void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
 435                                     unsigned int dom_id);
 436 void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
 437                                     struct rdt_domain *d);
 438 void mon_event_read(struct rmid_read *rr, struct rdt_domain *d,
 439                     struct rdtgroup *rdtgrp, int evtid, int first);
 440 void mbm_setup_overflow_handler(struct rdt_domain *dom,
 441                                 unsigned long delay_ms);
 442 void mbm_handle_overflow(struct work_struct *work);
 443 void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms);
 444 void cqm_handle_limbo(struct work_struct *work);
 445 bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
 446 void __check_limbo(struct rdt_domain *d, bool force_free);
 447
 448 #endif /* _ASM_X86_INTEL_RDT_H */