1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_INTEL_RDT_H
3 #define _ASM_X86_INTEL_RDT_H
5 #include <linux/sched.h>
6 #include <linux/kernfs.h>
7 #include <linux/jump_label.h>
9 #define IA32_L3_QOS_CFG 0xc81
10 #define IA32_L2_QOS_CFG 0xc82
11 #define IA32_L3_CBM_BASE 0xc90
12 #define IA32_L2_CBM_BASE 0xd10
13 #define IA32_MBA_THRTL_BASE 0xd50
15 #define L3_QOS_CDP_ENABLE 0x01ULL
17 #define L2_QOS_CDP_ENABLE 0x01ULL
20 * Event IDs are used to program IA32_QM_EVTSEL before reading event
21 * counter from IA32_QM_CTR
23 #define QOS_L3_OCCUP_EVENT_ID 0x01
24 #define QOS_L3_MBM_TOTAL_EVENT_ID 0x02
25 #define QOS_L3_MBM_LOCAL_EVENT_ID 0x03
27 #define CQM_LIMBOCHECK_INTERVAL 1000
29 #define MBM_CNTR_WIDTH 24
30 #define MBM_OVERFLOW_INTERVAL 1000
32 #define RMID_VAL_ERROR BIT_ULL(63)
33 #define RMID_VAL_UNAVAIL BIT_ULL(62)
35 DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
38 * struct mon_evt - Entry in the event list of a resource
40 * @name: name of the event
45 struct list_head list;
49 * struct mon_data_bits - Monitoring details for each event file
50 * @rid: Resource id associated with the event file.
51 * @evtid: Event id associated with the event file
52 * @domid: The domain to which the event file belongs
57 unsigned int rid : 10;
58 unsigned int evtid : 8;
59 unsigned int domid : 14;
64 struct rdtgroup *rgrp;
71 extern unsigned int intel_cqm_threshold;
72 extern bool rdt_alloc_capable;
73 extern bool rdt_mon_capable;
74 extern unsigned int rdt_mon_features;
83 * struct mongroup - store mon group's data in resctrl fs.
84 * @mon_data_kn kernlfs node for the mon_data directory
85 * @parent: parent rdtgrp
86 * @crdtgrp_list: child rdtgroup node list
87 * @rmid: rmid for this rdtgroup
90 struct kernfs_node *mon_data_kn;
91 struct rdtgroup *parent;
92 struct list_head crdtgrp_list;
97 * struct rdtgroup - store rdtgroup's data in resctrl file system.
99 * @rdtgroup_list: linked list for all rdtgroups
100 * @closid: closid for this rdtgroup
101 * @cpu_mask: CPUs assigned to this rdtgroup
102 * @flags: status bits
103 * @waitcount: how many cpus expect to find this
104 * group when they acquire rdtgroup_mutex
105 * @type: indicates type of this rdtgroup - either
106 * monitor only or ctrl_mon group
107 * @mon: mongroup related data
110 struct kernfs_node *kn;
111 struct list_head rdtgroup_list;
113 struct cpumask cpu_mask;
116 enum rdt_group_type type;
121 #define RDT_DELETED 1
124 #define RFTYPE_FLAGS_CPUS_LIST 1
127 * Define the file type flags for base and info directories.
129 #define RFTYPE_INFO BIT(0)
130 #define RFTYPE_BASE BIT(1)
131 #define RF_CTRLSHIFT 4
132 #define RF_MONSHIFT 5
133 #define RF_TOPSHIFT 6
134 #define RFTYPE_CTRL BIT(RF_CTRLSHIFT)
135 #define RFTYPE_MON BIT(RF_MONSHIFT)
136 #define RFTYPE_TOP BIT(RF_TOPSHIFT)
137 #define RFTYPE_RES_CACHE BIT(8)
138 #define RFTYPE_RES_MB BIT(9)
139 #define RF_CTRL_INFO (RFTYPE_INFO | RFTYPE_CTRL)
140 #define RF_MON_INFO (RFTYPE_INFO | RFTYPE_MON)
141 #define RF_TOP_INFO (RFTYPE_INFO | RFTYPE_TOP)
142 #define RF_CTRL_BASE (RFTYPE_BASE | RFTYPE_CTRL)
144 /* List of all resource groups */
145 extern struct list_head rdt_all_groups;
147 extern int max_name_width, max_data_width;
149 int __init rdtgroup_init(void);
152 * struct rftype - describe each file in the resctrl file system
155 * @kf_ops: File operations
156 * @flags: File specific RFTYPE_FLAGS_* flags
157 * @fflags: File specific RF_* or RFTYPE_* flags
158 * @seq_show: Show content of the file
159 * @write: Write to the file
164 struct kernfs_ops *kf_ops;
166 unsigned long fflags;
168 int (*seq_show)(struct kernfs_open_file *of,
169 struct seq_file *sf, void *v);
171 * write() is the generic write callback which maps directly to
172 * kernfs write operation and overrides all other operations.
173 * Maximum write size is determined by ->max_write_len.
175 ssize_t (*write)(struct kernfs_open_file *of,
176 char *buf, size_t nbytes, loff_t off);
180 * struct mbm_state - status for each MBM counter in each domain
181 * @chunks: Total data moved (multiply by rdt_group.mon_scale to get bytes)
182 * @prev_msr Value of IA32_QM_CTR for this RMID last time we read it
190 * struct rdt_domain - group of cpus sharing an RDT resource
191 * @list: all instances of this resource
192 * @id: unique id for this instance
193 * @cpu_mask: which cpus share this resource
195 * bitmap of which limbo RMIDs are above threshold
196 * @mbm_total: saved state for MBM total bandwidth
197 * @mbm_local: saved state for MBM local bandwidth
198 * @mbm_over: worker to periodically read MBM h/w counters
199 * @cqm_limbo: worker to periodically read CQM h/w counters
201 * worker cpu for MBM h/w counters
203 * worker cpu for CQM h/w counters
204 * @ctrl_val: array of cache or mem ctrl values (indexed by CLOSID)
205 * @mbps_val: When mba_sc is enabled, this holds the bandwidth in MBps
206 * @new_ctrl: new ctrl value to be loaded
207 * @have_new_ctrl: did user provide new_ctrl for this domain
210 struct list_head list;
212 struct cpumask cpu_mask;
213 unsigned long *rmid_busy_llc;
214 struct mbm_state *mbm_total;
215 struct mbm_state *mbm_local;
216 struct delayed_work mbm_over;
217 struct delayed_work cqm_limbo;
227 * struct msr_param - set a range of MSRs from a domain
228 * @res: The resource to use
229 * @low: Beginning index from base MSR
233 struct rdt_resource *res;
239 * struct rdt_cache - Cache allocation related data
240 * @cbm_len: Length of the cache bit mask
241 * @min_cbm_bits: Minimum number of consecutive bits to be set
242 * @cbm_idx_mult: Multiplier of CBM index
243 * @cbm_idx_offset: Offset of CBM index. CBM index is computed by:
244 * closid * cbm_idx_multi + cbm_idx_offset
245 * in a cache bit mask
246 * @shareable_bits: Bitmask of shareable resource with other
250 unsigned int cbm_len;
251 unsigned int min_cbm_bits;
252 unsigned int cbm_idx_mult;
253 unsigned int cbm_idx_offset;
254 unsigned int shareable_bits;
258 * struct rdt_membw - Memory bandwidth allocation related data
259 * @max_delay: Max throttle delay. Delay is the hardware
260 * representation for memory bandwidth.
261 * @min_bw: Minimum memory bandwidth percentage user can request
262 * @bw_gran: Granularity at which the memory bandwidth is allocated
263 * @delay_linear: True if memory B/W delay is in linear scale
264 * @mba_sc: True if MBA software controller(mba_sc) is enabled
265 * @mb_map: Mapping of memory B/W percentage to memory B/W delay
276 static inline bool is_llc_occupancy_enabled(void)
278 return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
281 static inline bool is_mbm_total_enabled(void)
283 return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID));
286 static inline bool is_mbm_local_enabled(void)
288 return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID));
291 static inline bool is_mbm_enabled(void)
293 return (is_mbm_total_enabled() || is_mbm_local_enabled());
296 static inline bool is_mbm_event(int e)
298 return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
299 e <= QOS_L3_MBM_LOCAL_EVENT_ID);
303 * struct rdt_resource - attributes of an RDT resource
304 * @rid: The index of the resource
305 * @alloc_enabled: Is allocation enabled on this machine
306 * @mon_enabled: Is monitoring enabled for this feature
307 * @alloc_capable: Is allocation available on this machine
308 * @mon_capable: Is monitor feature available on this machine
309 * @name: Name to use in "schemata" file
310 * @num_closid: Number of CLOSIDs available
311 * @cache_level: Which cache level defines scope of this resource
312 * @default_ctrl: Specifies default cache cbm or memory B/W percent.
313 * @msr_base: Base MSR address for CBMs
314 * @msr_update: Function pointer to update QOS MSRs
315 * @data_width: Character width of data when displaying
316 * @domains: All domains for this resource
317 * @cache: Cache allocation related data
318 * @format_str: Per resource format string to show domain value
319 * @parse_ctrlval: Per resource function pointer to parse control values
320 * @evt_list: List of monitoring events
321 * @num_rmid: Number of RMIDs available
322 * @mon_scale: cqm counter * mon_scale = occupancy in bytes
323 * @fflags: flags to choose base and info files
325 struct rdt_resource {
335 unsigned int msr_base;
336 void (*msr_update) (struct rdt_domain *d, struct msr_param *m,
337 struct rdt_resource *r);
339 struct list_head domains;
340 struct rdt_cache cache;
341 struct rdt_membw membw;
342 const char *format_str;
343 int (*parse_ctrlval) (char *buf, struct rdt_resource *r,
344 struct rdt_domain *d);
345 struct list_head evt_list;
347 unsigned int mon_scale;
348 unsigned long fflags;
351 int parse_cbm(char *buf, struct rdt_resource *r, struct rdt_domain *d);
352 int parse_bw(char *buf, struct rdt_resource *r, struct rdt_domain *d);
354 extern struct mutex rdtgroup_mutex;
356 extern struct rdt_resource rdt_resources_all[];
357 extern struct rdtgroup rdtgroup_default;
358 DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
360 int __init rdtgroup_init(void);
371 /* Must be the last */
375 #define for_each_capable_rdt_resource(r) \
376 for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
378 if (r->alloc_capable || r->mon_capable)
380 #define for_each_alloc_capable_rdt_resource(r) \
381 for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
383 if (r->alloc_capable)
385 #define for_each_mon_capable_rdt_resource(r) \
386 for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
390 #define for_each_alloc_enabled_rdt_resource(r) \
391 for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
393 if (r->alloc_enabled)
395 #define for_each_mon_enabled_rdt_resource(r) \
396 for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
400 /* CPUID.(EAX=10H, ECX=ResID=1).EAX */
401 union cpuid_0x10_1_eax {
403 unsigned int cbm_len:5;
408 /* CPUID.(EAX=10H, ECX=ResID=3).EAX */
409 union cpuid_0x10_3_eax {
411 unsigned int max_delay:12;
416 /* CPUID.(EAX=10H, ECX=ResID).EDX */
417 union cpuid_0x10_x_edx {
419 unsigned int cos_max:16;
424 void rdt_last_cmd_clear(void);
425 void rdt_last_cmd_puts(const char *s);
426 void rdt_last_cmd_printf(const char *fmt, ...);
428 void rdt_ctrl_update(void *arg);
429 struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn);
430 void rdtgroup_kn_unlock(struct kernfs_node *kn);
431 struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
432 struct list_head **pos);
433 ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
434 char *buf, size_t nbytes, loff_t off);
435 int rdtgroup_schemata_show(struct kernfs_open_file *of,
436 struct seq_file *s, void *v);
437 struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);
438 int alloc_rmid(void);
439 void free_rmid(u32 rmid);
440 int rdt_get_mon_l3_config(struct rdt_resource *r);
441 void mon_event_count(void *info);
442 int rdtgroup_mondata_show(struct seq_file *m, void *arg);
443 void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
444 unsigned int dom_id);
445 void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
446 struct rdt_domain *d);
447 void mon_event_read(struct rmid_read *rr, struct rdt_domain *d,
448 struct rdtgroup *rdtgrp, int evtid, int first);
449 void mbm_setup_overflow_handler(struct rdt_domain *dom,
450 unsigned long delay_ms);
451 void mbm_handle_overflow(struct work_struct *work);
452 bool is_mba_sc(struct rdt_resource *r);
453 void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm);
454 void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms);
455 void cqm_handle_limbo(struct work_struct *work);
456 bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
457 void __check_limbo(struct rdt_domain *d, bool force_free);
459 #endif /* _ASM_X86_INTEL_RDT_H */