arch/x86/include/asm/intel_rdt.h

   1 #ifndef _ASM_X86_INTEL_RDT_H
   2 #define _ASM_X86_INTEL_RDT_H
   3
   4 #ifdef CONFIG_INTEL_RDT_A
   5
   6 #include <linux/sched.h>
   7 #include <linux/kernfs.h>
   8 #include <linux/jump_label.h>
   9
  10 #include <asm/intel_rdt_common.h>
  11
  12 #define IA32_L3_QOS_CFG         0xc81
  13 #define IA32_L3_CBM_BASE        0xc90
  14 #define IA32_L2_CBM_BASE        0xd10
  15 #define IA32_MBA_THRTL_BASE     0xd50
  16
  17 #define L3_QOS_CDP_ENABLE       0x01ULL
  18
  19 /**
  20  * struct rdtgroup - store rdtgroup's data in resctrl file system.
  21  * @kn:                         kernfs node
  22  * @rdtgroup_list:              linked list for all rdtgroups
  23  * @closid:                     closid for this rdtgroup
  24  * @cpu_mask:                   CPUs assigned to this rdtgroup
  25  * @flags:                      status bits
  26  * @waitcount:                  how many cpus expect to find this
  27  *                              group when they acquire rdtgroup_mutex
  28  */
  29 struct rdtgroup {
  30         struct kernfs_node      *kn;
  31         struct list_head        rdtgroup_list;
  32         int                     closid;
  33         struct cpumask          cpu_mask;
  34         int                     flags;
  35         atomic_t                waitcount;
  36 };
  37
  38 /* rdtgroup.flags */
  39 #define RDT_DELETED             1
  40
  41 /* rftype.flags */
  42 #define RFTYPE_FLAGS_CPUS_LIST  1
  43
  44 /* List of all resource groups */
  45 extern struct list_head rdt_all_groups;
  46
  47 extern int max_name_width, max_data_width;
  48
  49 int __init rdtgroup_init(void);
  50
  51 /**
  52  * struct rftype - describe each file in the resctrl file system
  53  * @name:       File name
  54  * @mode:       Access mode
  55  * @kf_ops:     File operations
  56  * @flags:      File specific RFTYPE_FLAGS_* flags
  57  * @seq_show:   Show content of the file
  58  * @write:      Write to the file
  59  */
  60 struct rftype {
  61         char                    *name;
  62         umode_t                 mode;
  63         struct kernfs_ops       *kf_ops;
  64         unsigned long           flags;
  65
  66         int (*seq_show)(struct kernfs_open_file *of,
  67                         struct seq_file *sf, void *v);
  68         /*
  69          * write() is the generic write callback which maps directly to
  70          * kernfs write operation and overrides all other operations.
  71          * Maximum write size is determined by ->max_write_len.
  72          */
  73         ssize_t (*write)(struct kernfs_open_file *of,
  74                          char *buf, size_t nbytes, loff_t off);
  75 };
  76
  77 /**
  78  * struct rdt_domain - group of cpus sharing an RDT resource
  79  * @list:       all instances of this resource
  80  * @id:         unique id for this instance
  81  * @cpu_mask:   which cpus share this resource
  82  * @ctrl_val:   array of cache or mem ctrl values (indexed by CLOSID)
  83  * @new_ctrl:   new ctrl value to be loaded
  84  * @have_new_ctrl: did user provide new_ctrl for this domain
  85  */
  86 struct rdt_domain {
  87         struct list_head        list;
  88         int                     id;
  89         struct cpumask          cpu_mask;
  90         u32                     *ctrl_val;
  91         u32                     new_ctrl;
  92         bool                    have_new_ctrl;
  93 };
  94
  95 /**
  96  * struct msr_param - set a range of MSRs from a domain
  97  * @res:       The resource to use
  98  * @low:       Beginning index from base MSR
  99  * @high:      End index
 100  */
 101 struct msr_param {
 102         struct rdt_resource     *res;
 103         int                     low;
 104         int                     high;
 105 };
 106
 107 /**
 108  * struct rdt_cache - Cache allocation related data
 109  * @cbm_len:            Length of the cache bit mask
 110  * @min_cbm_bits:       Minimum number of consecutive bits to be set
 111  * @cbm_idx_mult:       Multiplier of CBM index
 112  * @cbm_idx_offset:     Offset of CBM index. CBM index is computed by:
 113  *                      closid * cbm_idx_multi + cbm_idx_offset
 114  *                      in a cache bit mask
 115  */
 116 struct rdt_cache {
 117         unsigned int    cbm_len;
 118         unsigned int    min_cbm_bits;
 119         unsigned int    cbm_idx_mult;
 120         unsigned int    cbm_idx_offset;
 121 };
 122
 123 /**
 124  * struct rdt_membw - Memory bandwidth allocation related data
 125  * @max_delay:          Max throttle delay. Delay is the hardware
 126  *                      representation for memory bandwidth.
 127  * @min_bw:             Minimum memory bandwidth percentage user can request
 128  * @bw_gran:            Granularity at which the memory bandwidth is allocated
 129  * @delay_linear:       True if memory B/W delay is in linear scale
 130  * @mb_map:             Mapping of memory B/W percentage to memory B/W delay
 131  */
 132 struct rdt_membw {
 133         u32             max_delay;
 134         u32             min_bw;
 135         u32             bw_gran;
 136         u32             delay_linear;
 137         u32             *mb_map;
 138 };
 139
 140 /**
 141  * struct rdt_resource - attributes of an RDT resource
 142  * @enabled:            Is this feature enabled on this machine
 143  * @capable:            Is this feature available on this machine
 144  * @name:               Name to use in "schemata" file
 145  * @num_closid:         Number of CLOSIDs available
 146  * @cache_level:        Which cache level defines scope of this resource
 147  * @default_ctrl:       Specifies default cache cbm or memory B/W percent.
 148  * @msr_base:           Base MSR address for CBMs
 149  * @msr_update:         Function pointer to update QOS MSRs
 150  * @data_width:         Character width of data when displaying
 151  * @domains:            All domains for this resource
 152  * @cache:              Cache allocation related data
 153  * @info_files:         resctrl info files for the resource
 154  * @nr_info_files:      Number of info files
 155  * @format_str:         Per resource format string to show domain value
 156  * @parse_ctrlval:      Per resource function pointer to parse control values
 157  */
 158 struct rdt_resource {
 159         bool                    enabled;
 160         bool                    capable;
 161         char                    *name;
 162         int                     num_closid;
 163         int                     cache_level;
 164         u32                     default_ctrl;
 165         unsigned int            msr_base;
 166         void (*msr_update)      (struct rdt_domain *d, struct msr_param *m,
 167                                  struct rdt_resource *r);
 168         int                     data_width;
 169         struct list_head        domains;
 170         struct rdt_cache        cache;
 171         struct rdt_membw        membw;
 172         struct rftype           *info_files;
 173         int                     nr_info_files;
 174         const char              *format_str;
 175         int (*parse_ctrlval)    (char *buf, struct rdt_resource *r,
 176                                  struct rdt_domain *d);
 177 };
 178
 179 void rdt_get_cache_infofile(struct rdt_resource *r);
 180 void rdt_get_mba_infofile(struct rdt_resource *r);
 181 int parse_cbm(char *buf, struct rdt_resource *r, struct rdt_domain *d);
 182 int parse_bw(char *buf, struct rdt_resource *r,  struct rdt_domain *d);
 183
 184 extern struct mutex rdtgroup_mutex;
 185
 186 extern struct rdt_resource rdt_resources_all[];
 187 extern struct rdtgroup rdtgroup_default;
 188 DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
 189
 190 int __init rdtgroup_init(void);
 191
 192 enum {
 193         RDT_RESOURCE_L3,
 194         RDT_RESOURCE_L3DATA,
 195         RDT_RESOURCE_L3CODE,
 196         RDT_RESOURCE_L2,
 197         RDT_RESOURCE_MBA,
 198
 199         /* Must be the last */
 200         RDT_NUM_RESOURCES,
 201 };
 202
 203 #define for_each_capable_rdt_resource(r)                                      \
 204         for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
 205              r++)                                                             \
 206                 if (r->capable)
 207
 208 #define for_each_enabled_rdt_resource(r)                                      \
 209         for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
 210              r++)                                                             \
 211                 if (r->enabled)
 212
 213 /* CPUID.(EAX=10H, ECX=ResID=1).EAX */
 214 union cpuid_0x10_1_eax {
 215         struct {
 216                 unsigned int cbm_len:5;
 217         } split;
 218         unsigned int full;
 219 };
 220
 221 /* CPUID.(EAX=10H, ECX=ResID=3).EAX */
 222 union cpuid_0x10_3_eax {
 223         struct {
 224                 unsigned int max_delay:12;
 225         } split;
 226         unsigned int full;
 227 };
 228
 229 /* CPUID.(EAX=10H, ECX=ResID).EDX */
 230 union cpuid_0x10_x_edx {
 231         struct {
 232                 unsigned int cos_max:16;
 233         } split;
 234         unsigned int full;
 235 };
 236
 237 DECLARE_PER_CPU_READ_MOSTLY(int, cpu_closid);
 238
 239 void rdt_ctrl_update(void *arg);
 240 struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn);
 241 void rdtgroup_kn_unlock(struct kernfs_node *kn);
 242 ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 243                                 char *buf, size_t nbytes, loff_t off);
 244 int rdtgroup_schemata_show(struct kernfs_open_file *of,
 245                            struct seq_file *s, void *v);
 246
 247 /*
 248  * intel_rdt_sched_in() - Writes the task's CLOSid to IA32_PQR_MSR
 249  *
 250  * Following considerations are made so that this has minimal impact
 251  * on scheduler hot path:
 252  * - This will stay as no-op unless we are running on an Intel SKU
 253  *   which supports resource control and we enable by mounting the
 254  *   resctrl file system.
 255  * - Caches the per cpu CLOSid values and does the MSR write only
 256  *   when a task with a different CLOSid is scheduled in.
 257  *
 258  * Must be called with preemption disabled.
 259  */
 260 static inline void intel_rdt_sched_in(void)
 261 {
 262         if (static_branch_likely(&rdt_enable_key)) {
 263                 struct intel_pqr_state *state = this_cpu_ptr(&pqr_state);
 264                 int closid;
 265
 266                 /*
 267                  * If this task has a closid assigned, use it.
 268                  * Else use the closid assigned to this cpu.
 269                  */
 270                 closid = current->closid;
 271                 if (closid == 0)
 272                         closid = this_cpu_read(cpu_closid);
 273
 274                 if (closid != state->closid) {
 275                         state->closid = closid;
 276                         wrmsr(MSR_IA32_PQR_ASSOC, state->rmid, closid);
 277                 }
 278         }
 279 }
 280
 281 #else
 282
 283 static inline void intel_rdt_sched_in(void) {}
 284
 285 #endif /* CONFIG_INTEL_RDT_A */
 286 #endif /* _ASM_X86_INTEL_RDT_H */