1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Resource Director Technology(RDT) 4 * - Cache Allocation code. 5 * 6 * Copyright (C) 2016 Intel Corporation 7 * 8 * Authors: 9 * Fenghua Yu <fenghua.yu@intel.com> 10 * Tony Luck <tony.luck@intel.com> 11 * Vikas Shivappa <vikas.shivappa@intel.com> 12 * 13 * More information about RDT be found in the Intel (R) x86 Architecture 14 * Software Developer Manual June 2016, volume 3, section 17.17. 15 */ 16 17 #define pr_fmt(fmt) "resctrl: " fmt 18 19 #include <linux/cpu.h> 20 #include <linux/slab.h> 21 #include <linux/err.h> 22 #include <linux/cpuhotplug.h> 23 24 #include <asm/cpu_device_id.h> 25 #include <asm/msr.h> 26 #include <asm/resctrl.h> 27 #include "internal.h" 28 29 /* 30 * rdt_domain structures are kfree()d when their last CPU goes offline, 31 * and allocated when the first CPU in a new domain comes online. 32 * The rdt_resource's domain list is updated when this happens. Readers of 33 * the domain list must either take cpus_read_lock(), or rely on an RCU 34 * read-side critical section, to avoid observing concurrent modification. 35 * All writers take this mutex: 36 */ 37 static DEFINE_MUTEX(domain_list_lock); 38 39 /* 40 * The cached resctrl_pqr_state is strictly per CPU and can never be 41 * updated from a remote CPU. Functions which modify the state 42 * are called with interrupts disabled and no preemption, which 43 * is sufficient for the protection. 44 */ 45 DEFINE_PER_CPU(struct resctrl_pqr_state, pqr_state); 46 47 /* 48 * Global boolean for rdt_alloc which is true if any 49 * resource allocation is enabled. 50 */ 51 bool rdt_alloc_capable; 52 53 static void mba_wrmsr_intel(struct msr_param *m); 54 static void cat_wrmsr(struct msr_param *m); 55 static void mba_wrmsr_amd(struct msr_param *m); 56 57 #define ctrl_domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.ctrl_domains) 58 #define mon_domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.mon_domains) 59 60 struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = { 61 [RDT_RESOURCE_L3] = 62 { 63 .r_resctrl = { 64 .name = "L3", 65 .ctrl_scope = RESCTRL_L3_CACHE, 66 .mon_scope = RESCTRL_L3_CACHE, 67 .ctrl_domains = ctrl_domain_init(RDT_RESOURCE_L3), 68 .mon_domains = mon_domain_init(RDT_RESOURCE_L3), 69 .schema_fmt = RESCTRL_SCHEMA_BITMAP, 70 }, 71 .msr_base = MSR_IA32_L3_CBM_BASE, 72 .msr_update = cat_wrmsr, 73 }, 74 [RDT_RESOURCE_L2] = 75 { 76 .r_resctrl = { 77 .name = "L2", 78 .ctrl_scope = RESCTRL_L2_CACHE, 79 .ctrl_domains = ctrl_domain_init(RDT_RESOURCE_L2), 80 .schema_fmt = RESCTRL_SCHEMA_BITMAP, 81 }, 82 .msr_base = MSR_IA32_L2_CBM_BASE, 83 .msr_update = cat_wrmsr, 84 }, 85 [RDT_RESOURCE_MBA] = 86 { 87 .r_resctrl = { 88 .name = "MB", 89 .ctrl_scope = RESCTRL_L3_CACHE, 90 .ctrl_domains = ctrl_domain_init(RDT_RESOURCE_MBA), 91 .schema_fmt = RESCTRL_SCHEMA_RANGE, 92 }, 93 }, 94 [RDT_RESOURCE_SMBA] = 95 { 96 .r_resctrl = { 97 .name = "SMBA", 98 .ctrl_scope = RESCTRL_L3_CACHE, 99 .ctrl_domains = ctrl_domain_init(RDT_RESOURCE_SMBA), 100 .schema_fmt = RESCTRL_SCHEMA_RANGE, 101 }, 102 }, 103 [RDT_RESOURCE_PERF_PKG] = 104 { 105 .r_resctrl = { 106 .name = "PERF_PKG", 107 .mon_scope = RESCTRL_PACKAGE, 108 .mon_domains = mon_domain_init(RDT_RESOURCE_PERF_PKG), 109 }, 110 }, 111 }; 112 113 u32 resctrl_arch_system_num_rmid_idx(void) 114 { 115 struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl; 116 117 /* RMID are independent numbers for x86. num_rmid_idx == num_rmid */ 118 return r->mon.num_rmid; 119 } 120 121 struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l) 122 { 123 if (l >= RDT_NUM_RESOURCES) 124 return NULL; 125 126 return &rdt_resources_all[l].r_resctrl; 127 } 128 129 /* 130 * cache_alloc_hsw_probe() - Have to probe for Intel haswell server CPUs 131 * as they do not have CPUID enumeration support for Cache allocation. 132 * The check for Vendor/Family/Model is not enough to guarantee that 133 * the MSRs won't #GP fault because only the following SKUs support 134 * CAT: 135 * Intel(R) Xeon(R) CPU E5-2658 v3 @ 2.20GHz 136 * Intel(R) Xeon(R) CPU E5-2648L v3 @ 1.80GHz 137 * Intel(R) Xeon(R) CPU E5-2628L v3 @ 2.00GHz 138 * Intel(R) Xeon(R) CPU E5-2618L v3 @ 2.30GHz 139 * Intel(R) Xeon(R) CPU E5-2608L v3 @ 2.00GHz 140 * Intel(R) Xeon(R) CPU E5-2658A v3 @ 2.20GHz 141 * 142 * Probe by trying to write the first of the L3 cache mask registers 143 * and checking that the bits stick. Max CLOSids is always 4 and max cbm length 144 * is always 20 on hsw server parts. The minimum cache bitmask length 145 * allowed for HSW server is always 2 bits. Hardcode all of them. 146 */ 147 static inline void cache_alloc_hsw_probe(void) 148 { 149 struct rdt_hw_resource *hw_res = &rdt_resources_all[RDT_RESOURCE_L3]; 150 struct rdt_resource *r = &hw_res->r_resctrl; 151 u64 max_cbm = BIT_ULL_MASK(20) - 1, l3_cbm_0; 152 153 if (wrmsrq_safe(MSR_IA32_L3_CBM_BASE, max_cbm)) 154 return; 155 156 rdmsrq(MSR_IA32_L3_CBM_BASE, l3_cbm_0); 157 158 /* If all the bits were set in MSR, return success */ 159 if (l3_cbm_0 != max_cbm) 160 return; 161 162 hw_res->num_closid = 4; 163 r->cache.cbm_len = 20; 164 r->cache.shareable_bits = 0xc0000; 165 r->cache.min_cbm_bits = 2; 166 r->cache.arch_has_sparse_bitmasks = false; 167 r->alloc_capable = true; 168 169 rdt_alloc_capable = true; 170 } 171 172 /* 173 * rdt_get_mb_table() - get a mapping of bandwidth(b/w) percentage values 174 * exposed to user interface and the h/w understandable delay values. 175 * 176 * The non-linear delay values have the granularity of power of two 177 * and also the h/w does not guarantee a curve for configured delay 178 * values vs. actual b/w enforced. 179 * Hence we need a mapping that is pre calibrated so the user can 180 * express the memory b/w as a percentage value. 181 */ 182 static inline bool rdt_get_mb_table(struct rdt_resource *r) 183 { 184 /* 185 * There are no Intel SKUs as of now to support non-linear delay. 186 */ 187 pr_info("MBA b/w map not implemented for cpu:%d, model:%d", 188 boot_cpu_data.x86, boot_cpu_data.x86_model); 189 190 return false; 191 } 192 193 static __init bool __get_mem_config_intel(struct rdt_resource *r) 194 { 195 struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); 196 union cpuid_0x10_3_eax eax; 197 union cpuid_0x10_x_edx edx; 198 u32 ebx, ecx, max_delay; 199 200 cpuid_count(0x00000010, 3, &eax.full, &ebx, &ecx, &edx.full); 201 hw_res->num_closid = edx.split.cos_max + 1; 202 max_delay = eax.split.max_delay + 1; 203 r->membw.max_bw = MAX_MBA_BW; 204 r->membw.arch_needs_linear = true; 205 if (ecx & MBA_IS_LINEAR) { 206 r->membw.delay_linear = true; 207 r->membw.min_bw = MAX_MBA_BW - max_delay; 208 r->membw.bw_gran = MAX_MBA_BW - max_delay; 209 } else { 210 if (!rdt_get_mb_table(r)) 211 return false; 212 r->membw.arch_needs_linear = false; 213 } 214 215 if (boot_cpu_has(X86_FEATURE_PER_THREAD_MBA)) 216 r->membw.throttle_mode = THREAD_THROTTLE_PER_THREAD; 217 else 218 r->membw.throttle_mode = THREAD_THROTTLE_MAX; 219 220 r->alloc_capable = true; 221 222 return true; 223 } 224 225 static __init bool __rdt_get_mem_config_amd(struct rdt_resource *r) 226 { 227 struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); 228 u32 eax, ebx, ecx, edx, subleaf; 229 230 /* 231 * Query CPUID_Fn80000020_EDX_x01 for MBA and 232 * CPUID_Fn80000020_EDX_x02 for SMBA 233 */ 234 subleaf = (r->rid == RDT_RESOURCE_SMBA) ? 2 : 1; 235 236 cpuid_count(0x80000020, subleaf, &eax, &ebx, &ecx, &edx); 237 hw_res->num_closid = edx + 1; 238 r->membw.max_bw = 1 << eax; 239 240 /* AMD does not use delay */ 241 r->membw.delay_linear = false; 242 r->membw.arch_needs_linear = false; 243 244 /* 245 * AMD does not use memory delay throttle model to control 246 * the allocation like Intel does. 247 */ 248 r->membw.throttle_mode = THREAD_THROTTLE_UNDEFINED; 249 r->membw.min_bw = 0; 250 r->membw.bw_gran = 1; 251 252 r->alloc_capable = true; 253 254 return true; 255 } 256 257 static void rdt_get_cache_alloc_cfg(int idx, struct rdt_resource *r) 258 { 259 struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); 260 union cpuid_0x10_1_eax eax; 261 union cpuid_0x10_x_ecx ecx; 262 union cpuid_0x10_x_edx edx; 263 u32 ebx, default_ctrl; 264 265 cpuid_count(0x00000010, idx, &eax.full, &ebx, &ecx.full, &edx.full); 266 hw_res->num_closid = edx.split.cos_max + 1; 267 r->cache.cbm_len = eax.split.cbm_len + 1; 268 default_ctrl = BIT_MASK(eax.split.cbm_len + 1) - 1; 269 r->cache.shareable_bits = ebx & default_ctrl; 270 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) 271 r->cache.arch_has_sparse_bitmasks = ecx.split.noncont; 272 r->alloc_capable = true; 273 } 274 275 static void rdt_get_cdp_config(int level) 276 { 277 /* 278 * By default, CDP is disabled. CDP can be enabled by mount parameter 279 * "cdp" during resctrl file system mount time. 280 */ 281 rdt_resources_all[level].cdp_enabled = false; 282 rdt_resources_all[level].r_resctrl.cdp_capable = true; 283 } 284 285 static void rdt_set_io_alloc_capable(struct rdt_resource *r) 286 { 287 r->cache.io_alloc_capable = true; 288 } 289 290 static void rdt_get_cdp_l3_config(void) 291 { 292 rdt_get_cdp_config(RDT_RESOURCE_L3); 293 } 294 295 static void rdt_get_cdp_l2_config(void) 296 { 297 rdt_get_cdp_config(RDT_RESOURCE_L2); 298 } 299 300 static void mba_wrmsr_amd(struct msr_param *m) 301 { 302 struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(m->dom); 303 struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res); 304 unsigned int i; 305 306 for (i = m->low; i < m->high; i++) 307 wrmsrq(hw_res->msr_base + i, hw_dom->ctrl_val[i]); 308 } 309 310 /* 311 * Map the memory b/w percentage value to delay values 312 * that can be written to QOS_MSRs. 313 * There are currently no SKUs which support non linear delay values. 314 */ 315 static u32 delay_bw_map(unsigned long bw, struct rdt_resource *r) 316 { 317 if (r->membw.delay_linear) 318 return MAX_MBA_BW - bw; 319 320 pr_warn_once("Non Linear delay-bw map not supported but queried\n"); 321 return MAX_MBA_BW; 322 } 323 324 static void mba_wrmsr_intel(struct msr_param *m) 325 { 326 struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(m->dom); 327 struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res); 328 unsigned int i; 329 330 /* Write the delay values for mba. */ 331 for (i = m->low; i < m->high; i++) 332 wrmsrq(hw_res->msr_base + i, delay_bw_map(hw_dom->ctrl_val[i], m->res)); 333 } 334 335 static void cat_wrmsr(struct msr_param *m) 336 { 337 struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(m->dom); 338 struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res); 339 unsigned int i; 340 341 for (i = m->low; i < m->high; i++) 342 wrmsrq(hw_res->msr_base + i, hw_dom->ctrl_val[i]); 343 } 344 345 u32 resctrl_arch_get_num_closid(struct rdt_resource *r) 346 { 347 return resctrl_to_arch_res(r)->num_closid; 348 } 349 350 void rdt_ctrl_update(void *arg) 351 { 352 struct rdt_hw_resource *hw_res; 353 struct msr_param *m = arg; 354 355 hw_res = resctrl_to_arch_res(m->res); 356 hw_res->msr_update(m); 357 } 358 359 static void setup_default_ctrlval(struct rdt_resource *r, u32 *dc) 360 { 361 struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); 362 int i; 363 364 /* 365 * Initialize the Control MSRs to having no control. 366 * For Cache Allocation: Set all bits in cbm 367 * For Memory Allocation: Set b/w requested to 100% 368 */ 369 for (i = 0; i < hw_res->num_closid; i++, dc++) 370 *dc = resctrl_get_default_ctrl(r); 371 } 372 373 static void ctrl_domain_free(struct rdt_hw_ctrl_domain *hw_dom) 374 { 375 kfree(hw_dom->ctrl_val); 376 kfree(hw_dom); 377 } 378 379 static void l3_mon_domain_free(struct rdt_hw_l3_mon_domain *hw_dom) 380 { 381 int idx; 382 383 for_each_mbm_idx(idx) 384 kfree(hw_dom->arch_mbm_states[idx]); 385 kfree(hw_dom); 386 } 387 388 static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_ctrl_domain *d) 389 { 390 struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(d); 391 struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r); 392 struct msr_param m; 393 u32 *dc; 394 395 dc = kmalloc_array(hw_res->num_closid, sizeof(*hw_dom->ctrl_val), 396 GFP_KERNEL); 397 if (!dc) 398 return -ENOMEM; 399 400 hw_dom->ctrl_val = dc; 401 setup_default_ctrlval(r, dc); 402 403 m.res = r; 404 m.dom = d; 405 m.low = 0; 406 m.high = hw_res->num_closid; 407 hw_res->msr_update(&m); 408 return 0; 409 } 410 411 /** 412 * l3_mon_domain_mbm_alloc() - Allocate arch private storage for the MBM counters 413 * @num_rmid: The size of the MBM counter array 414 * @hw_dom: The domain that owns the allocated arrays 415 * 416 * Return: 0 for success, or -ENOMEM. 417 */ 418 static int l3_mon_domain_mbm_alloc(u32 num_rmid, struct rdt_hw_l3_mon_domain *hw_dom) 419 { 420 size_t tsize = sizeof(*hw_dom->arch_mbm_states[0]); 421 enum resctrl_event_id eventid; 422 int idx; 423 424 for_each_mbm_event_id(eventid) { 425 if (!resctrl_is_mon_event_enabled(eventid)) 426 continue; 427 idx = MBM_STATE_IDX(eventid); 428 hw_dom->arch_mbm_states[idx] = kcalloc(num_rmid, tsize, GFP_KERNEL); 429 if (!hw_dom->arch_mbm_states[idx]) 430 goto cleanup; 431 } 432 433 return 0; 434 cleanup: 435 for_each_mbm_idx(idx) { 436 kfree(hw_dom->arch_mbm_states[idx]); 437 hw_dom->arch_mbm_states[idx] = NULL; 438 } 439 440 return -ENOMEM; 441 } 442 443 static int get_domain_id_from_scope(int cpu, enum resctrl_scope scope) 444 { 445 switch (scope) { 446 case RESCTRL_L2_CACHE: 447 case RESCTRL_L3_CACHE: 448 return get_cpu_cacheinfo_id(cpu, scope); 449 case RESCTRL_L3_NODE: 450 return cpu_to_node(cpu); 451 case RESCTRL_PACKAGE: 452 return topology_physical_package_id(cpu); 453 default: 454 break; 455 } 456 457 return -EINVAL; 458 } 459 460 static void domain_add_cpu_ctrl(int cpu, struct rdt_resource *r) 461 { 462 int id = get_domain_id_from_scope(cpu, r->ctrl_scope); 463 struct rdt_hw_ctrl_domain *hw_dom; 464 struct list_head *add_pos = NULL; 465 struct rdt_domain_hdr *hdr; 466 struct rdt_ctrl_domain *d; 467 int err; 468 469 lockdep_assert_held(&domain_list_lock); 470 471 if (id < 0) { 472 pr_warn_once("Can't find control domain id for CPU:%d scope:%d for resource %s\n", 473 cpu, r->ctrl_scope, r->name); 474 return; 475 } 476 477 hdr = resctrl_find_domain(&r->ctrl_domains, id, &add_pos); 478 if (hdr) { 479 if (!domain_header_is_valid(hdr, RESCTRL_CTRL_DOMAIN, r->rid)) 480 return; 481 d = container_of(hdr, struct rdt_ctrl_domain, hdr); 482 483 cpumask_set_cpu(cpu, &d->hdr.cpu_mask); 484 if (r->cache.arch_has_per_cpu_cfg) 485 rdt_domain_reconfigure_cdp(r); 486 return; 487 } 488 489 hw_dom = kzalloc_node(sizeof(*hw_dom), GFP_KERNEL, cpu_to_node(cpu)); 490 if (!hw_dom) 491 return; 492 493 d = &hw_dom->d_resctrl; 494 d->hdr.id = id; 495 d->hdr.type = RESCTRL_CTRL_DOMAIN; 496 d->hdr.rid = r->rid; 497 cpumask_set_cpu(cpu, &d->hdr.cpu_mask); 498 499 rdt_domain_reconfigure_cdp(r); 500 501 if (domain_setup_ctrlval(r, d)) { 502 ctrl_domain_free(hw_dom); 503 return; 504 } 505 506 list_add_tail_rcu(&d->hdr.list, add_pos); 507 508 err = resctrl_online_ctrl_domain(r, d); 509 if (err) { 510 list_del_rcu(&d->hdr.list); 511 synchronize_rcu(); 512 ctrl_domain_free(hw_dom); 513 } 514 } 515 516 static void l3_mon_domain_setup(int cpu, int id, struct rdt_resource *r, struct list_head *add_pos) 517 { 518 struct rdt_hw_l3_mon_domain *hw_dom; 519 struct rdt_l3_mon_domain *d; 520 struct cacheinfo *ci; 521 int err; 522 523 hw_dom = kzalloc_node(sizeof(*hw_dom), GFP_KERNEL, cpu_to_node(cpu)); 524 if (!hw_dom) 525 return; 526 527 d = &hw_dom->d_resctrl; 528 d->hdr.id = id; 529 d->hdr.type = RESCTRL_MON_DOMAIN; 530 d->hdr.rid = RDT_RESOURCE_L3; 531 ci = get_cpu_cacheinfo_level(cpu, RESCTRL_L3_CACHE); 532 if (!ci) { 533 pr_warn_once("Can't find L3 cache for CPU:%d resource %s\n", cpu, r->name); 534 l3_mon_domain_free(hw_dom); 535 return; 536 } 537 d->ci_id = ci->id; 538 cpumask_set_cpu(cpu, &d->hdr.cpu_mask); 539 540 arch_mon_domain_online(r, d); 541 542 if (l3_mon_domain_mbm_alloc(r->mon.num_rmid, hw_dom)) { 543 l3_mon_domain_free(hw_dom); 544 return; 545 } 546 547 list_add_tail_rcu(&d->hdr.list, add_pos); 548 549 err = resctrl_online_mon_domain(r, &d->hdr); 550 if (err) { 551 list_del_rcu(&d->hdr.list); 552 synchronize_rcu(); 553 l3_mon_domain_free(hw_dom); 554 } 555 } 556 557 static void domain_add_cpu_mon(int cpu, struct rdt_resource *r) 558 { 559 int id = get_domain_id_from_scope(cpu, r->mon_scope); 560 struct list_head *add_pos = NULL; 561 struct rdt_domain_hdr *hdr; 562 563 lockdep_assert_held(&domain_list_lock); 564 565 if (id < 0) { 566 pr_warn_once("Can't find monitor domain id for CPU:%d scope:%d for resource %s\n", 567 cpu, r->mon_scope, r->name); 568 return; 569 } 570 571 hdr = resctrl_find_domain(&r->mon_domains, id, &add_pos); 572 if (hdr) 573 cpumask_set_cpu(cpu, &hdr->cpu_mask); 574 575 switch (r->rid) { 576 case RDT_RESOURCE_L3: 577 /* Update the mbm_assign_mode state for the CPU if supported */ 578 if (r->mon.mbm_cntr_assignable) 579 resctrl_arch_mbm_cntr_assign_set_one(r); 580 if (!hdr) 581 l3_mon_domain_setup(cpu, id, r, add_pos); 582 break; 583 default: 584 pr_warn_once("Unknown resource rid=%d\n", r->rid); 585 break; 586 } 587 } 588 589 static void domain_add_cpu(int cpu, struct rdt_resource *r) 590 { 591 if (r->alloc_capable) 592 domain_add_cpu_ctrl(cpu, r); 593 if (r->mon_capable) 594 domain_add_cpu_mon(cpu, r); 595 } 596 597 static void domain_remove_cpu_ctrl(int cpu, struct rdt_resource *r) 598 { 599 int id = get_domain_id_from_scope(cpu, r->ctrl_scope); 600 struct rdt_hw_ctrl_domain *hw_dom; 601 struct rdt_domain_hdr *hdr; 602 struct rdt_ctrl_domain *d; 603 604 lockdep_assert_held(&domain_list_lock); 605 606 if (id < 0) { 607 pr_warn_once("Can't find control domain id for CPU:%d scope:%d for resource %s\n", 608 cpu, r->ctrl_scope, r->name); 609 return; 610 } 611 612 hdr = resctrl_find_domain(&r->ctrl_domains, id, NULL); 613 if (!hdr) { 614 pr_warn("Can't find control domain for id=%d for CPU %d for resource %s\n", 615 id, cpu, r->name); 616 return; 617 } 618 619 cpumask_clear_cpu(cpu, &hdr->cpu_mask); 620 if (!cpumask_empty(&hdr->cpu_mask)) 621 return; 622 623 if (!domain_header_is_valid(hdr, RESCTRL_CTRL_DOMAIN, r->rid)) 624 return; 625 626 d = container_of(hdr, struct rdt_ctrl_domain, hdr); 627 hw_dom = resctrl_to_arch_ctrl_dom(d); 628 629 resctrl_offline_ctrl_domain(r, d); 630 list_del_rcu(&hdr->list); 631 synchronize_rcu(); 632 633 /* 634 * rdt_ctrl_domain "d" is going to be freed below, so clear 635 * its pointer from pseudo_lock_region struct. 636 */ 637 if (d->plr) 638 d->plr->d = NULL; 639 ctrl_domain_free(hw_dom); 640 } 641 642 static void domain_remove_cpu_mon(int cpu, struct rdt_resource *r) 643 { 644 int id = get_domain_id_from_scope(cpu, r->mon_scope); 645 struct rdt_domain_hdr *hdr; 646 647 lockdep_assert_held(&domain_list_lock); 648 649 if (id < 0) { 650 pr_warn_once("Can't find monitor domain id for CPU:%d scope:%d for resource %s\n", 651 cpu, r->mon_scope, r->name); 652 return; 653 } 654 655 hdr = resctrl_find_domain(&r->mon_domains, id, NULL); 656 if (!hdr) { 657 pr_warn("Can't find monitor domain for id=%d for CPU %d for resource %s\n", 658 id, cpu, r->name); 659 return; 660 } 661 662 cpumask_clear_cpu(cpu, &hdr->cpu_mask); 663 if (!cpumask_empty(&hdr->cpu_mask)) 664 return; 665 666 switch (r->rid) { 667 case RDT_RESOURCE_L3: { 668 struct rdt_hw_l3_mon_domain *hw_dom; 669 struct rdt_l3_mon_domain *d; 670 671 if (!domain_header_is_valid(hdr, RESCTRL_MON_DOMAIN, RDT_RESOURCE_L3)) 672 return; 673 674 d = container_of(hdr, struct rdt_l3_mon_domain, hdr); 675 hw_dom = resctrl_to_arch_mon_dom(d); 676 resctrl_offline_mon_domain(r, hdr); 677 list_del_rcu(&hdr->list); 678 synchronize_rcu(); 679 l3_mon_domain_free(hw_dom); 680 break; 681 } 682 default: 683 pr_warn_once("Unknown resource rid=%d\n", r->rid); 684 break; 685 } 686 } 687 688 static void domain_remove_cpu(int cpu, struct rdt_resource *r) 689 { 690 if (r->alloc_capable) 691 domain_remove_cpu_ctrl(cpu, r); 692 if (r->mon_capable) 693 domain_remove_cpu_mon(cpu, r); 694 } 695 696 static void clear_closid_rmid(int cpu) 697 { 698 struct resctrl_pqr_state *state = this_cpu_ptr(&pqr_state); 699 700 state->default_closid = RESCTRL_RESERVED_CLOSID; 701 state->default_rmid = RESCTRL_RESERVED_RMID; 702 state->cur_closid = RESCTRL_RESERVED_CLOSID; 703 state->cur_rmid = RESCTRL_RESERVED_RMID; 704 wrmsr(MSR_IA32_PQR_ASSOC, RESCTRL_RESERVED_RMID, 705 RESCTRL_RESERVED_CLOSID); 706 } 707 708 static int resctrl_arch_online_cpu(unsigned int cpu) 709 { 710 struct rdt_resource *r; 711 712 mutex_lock(&domain_list_lock); 713 for_each_capable_rdt_resource(r) 714 domain_add_cpu(cpu, r); 715 mutex_unlock(&domain_list_lock); 716 717 clear_closid_rmid(cpu); 718 resctrl_online_cpu(cpu); 719 720 return 0; 721 } 722 723 static int resctrl_arch_offline_cpu(unsigned int cpu) 724 { 725 struct rdt_resource *r; 726 727 resctrl_offline_cpu(cpu); 728 729 mutex_lock(&domain_list_lock); 730 for_each_capable_rdt_resource(r) 731 domain_remove_cpu(cpu, r); 732 mutex_unlock(&domain_list_lock); 733 734 clear_closid_rmid(cpu); 735 736 return 0; 737 } 738 739 void resctrl_arch_pre_mount(void) 740 { 741 if (!intel_aet_get_events()) 742 return; 743 } 744 745 enum { 746 RDT_FLAG_CMT, 747 RDT_FLAG_MBM_TOTAL, 748 RDT_FLAG_MBM_LOCAL, 749 RDT_FLAG_L3_CAT, 750 RDT_FLAG_L3_CDP, 751 RDT_FLAG_L2_CAT, 752 RDT_FLAG_L2_CDP, 753 RDT_FLAG_MBA, 754 RDT_FLAG_SMBA, 755 RDT_FLAG_BMEC, 756 RDT_FLAG_ABMC, 757 RDT_FLAG_SDCIAE, 758 }; 759 760 #define RDT_OPT(idx, n, f) \ 761 [idx] = { \ 762 .name = n, \ 763 .flag = f \ 764 } 765 766 struct rdt_options { 767 char *name; 768 int flag; 769 bool force_off, force_on; 770 }; 771 772 static struct rdt_options rdt_options[] __ro_after_init = { 773 RDT_OPT(RDT_FLAG_CMT, "cmt", X86_FEATURE_CQM_OCCUP_LLC), 774 RDT_OPT(RDT_FLAG_MBM_TOTAL, "mbmtotal", X86_FEATURE_CQM_MBM_TOTAL), 775 RDT_OPT(RDT_FLAG_MBM_LOCAL, "mbmlocal", X86_FEATURE_CQM_MBM_LOCAL), 776 RDT_OPT(RDT_FLAG_L3_CAT, "l3cat", X86_FEATURE_CAT_L3), 777 RDT_OPT(RDT_FLAG_L3_CDP, "l3cdp", X86_FEATURE_CDP_L3), 778 RDT_OPT(RDT_FLAG_L2_CAT, "l2cat", X86_FEATURE_CAT_L2), 779 RDT_OPT(RDT_FLAG_L2_CDP, "l2cdp", X86_FEATURE_CDP_L2), 780 RDT_OPT(RDT_FLAG_MBA, "mba", X86_FEATURE_MBA), 781 RDT_OPT(RDT_FLAG_SMBA, "smba", X86_FEATURE_SMBA), 782 RDT_OPT(RDT_FLAG_BMEC, "bmec", X86_FEATURE_BMEC), 783 RDT_OPT(RDT_FLAG_ABMC, "abmc", X86_FEATURE_ABMC), 784 RDT_OPT(RDT_FLAG_SDCIAE, "sdciae", X86_FEATURE_SDCIAE), 785 }; 786 #define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options) 787 788 static int __init set_rdt_options(char *str) 789 { 790 struct rdt_options *o; 791 bool force_off; 792 char *tok; 793 794 if (*str == '=') 795 str++; 796 while ((tok = strsep(&str, ",")) != NULL) { 797 force_off = *tok == '!'; 798 if (force_off) 799 tok++; 800 for (o = rdt_options; o < &rdt_options[NUM_RDT_OPTIONS]; o++) { 801 if (strcmp(tok, o->name) == 0) { 802 if (force_off) 803 o->force_off = true; 804 else 805 o->force_on = true; 806 break; 807 } 808 } 809 } 810 return 1; 811 } 812 __setup("rdt", set_rdt_options); 813 814 bool rdt_cpu_has(int flag) 815 { 816 bool ret = boot_cpu_has(flag); 817 struct rdt_options *o; 818 819 if (!ret) 820 return ret; 821 822 for (o = rdt_options; o < &rdt_options[NUM_RDT_OPTIONS]; o++) { 823 if (flag == o->flag) { 824 if (o->force_off) 825 ret = false; 826 if (o->force_on) 827 ret = true; 828 break; 829 } 830 } 831 return ret; 832 } 833 834 bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt) 835 { 836 if (!rdt_cpu_has(X86_FEATURE_BMEC)) 837 return false; 838 839 switch (evt) { 840 case QOS_L3_MBM_TOTAL_EVENT_ID: 841 return rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL); 842 case QOS_L3_MBM_LOCAL_EVENT_ID: 843 return rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL); 844 default: 845 return false; 846 } 847 } 848 849 static __init bool get_mem_config(void) 850 { 851 struct rdt_hw_resource *hw_res = &rdt_resources_all[RDT_RESOURCE_MBA]; 852 853 if (!rdt_cpu_has(X86_FEATURE_MBA)) 854 return false; 855 856 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) 857 return __get_mem_config_intel(&hw_res->r_resctrl); 858 else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) 859 return __rdt_get_mem_config_amd(&hw_res->r_resctrl); 860 861 return false; 862 } 863 864 static __init bool get_slow_mem_config(void) 865 { 866 struct rdt_hw_resource *hw_res = &rdt_resources_all[RDT_RESOURCE_SMBA]; 867 868 if (!rdt_cpu_has(X86_FEATURE_SMBA)) 869 return false; 870 871 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) 872 return __rdt_get_mem_config_amd(&hw_res->r_resctrl); 873 874 return false; 875 } 876 877 static __init bool get_rdt_alloc_resources(void) 878 { 879 struct rdt_resource *r; 880 bool ret = false; 881 882 if (rdt_alloc_capable) 883 return true; 884 885 if (!boot_cpu_has(X86_FEATURE_RDT_A)) 886 return false; 887 888 if (rdt_cpu_has(X86_FEATURE_CAT_L3)) { 889 r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl; 890 rdt_get_cache_alloc_cfg(1, r); 891 if (rdt_cpu_has(X86_FEATURE_CDP_L3)) 892 rdt_get_cdp_l3_config(); 893 if (rdt_cpu_has(X86_FEATURE_SDCIAE)) 894 rdt_set_io_alloc_capable(r); 895 ret = true; 896 } 897 if (rdt_cpu_has(X86_FEATURE_CAT_L2)) { 898 /* CPUID 0x10.2 fields are same format at 0x10.1 */ 899 r = &rdt_resources_all[RDT_RESOURCE_L2].r_resctrl; 900 rdt_get_cache_alloc_cfg(2, r); 901 if (rdt_cpu_has(X86_FEATURE_CDP_L2)) 902 rdt_get_cdp_l2_config(); 903 ret = true; 904 } 905 906 if (get_mem_config()) 907 ret = true; 908 909 if (get_slow_mem_config()) 910 ret = true; 911 912 return ret; 913 } 914 915 static __init bool get_rdt_mon_resources(void) 916 { 917 struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl; 918 bool ret = false; 919 920 if (rdt_cpu_has(X86_FEATURE_CQM_OCCUP_LLC)) { 921 resctrl_enable_mon_event(QOS_L3_OCCUP_EVENT_ID, false, 0); 922 ret = true; 923 } 924 if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL)) { 925 resctrl_enable_mon_event(QOS_L3_MBM_TOTAL_EVENT_ID, false, 0); 926 ret = true; 927 } 928 if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL)) { 929 resctrl_enable_mon_event(QOS_L3_MBM_LOCAL_EVENT_ID, false, 0); 930 ret = true; 931 } 932 if (rdt_cpu_has(X86_FEATURE_ABMC)) 933 ret = true; 934 935 if (!ret) 936 return false; 937 938 return !rdt_get_l3_mon_config(r); 939 } 940 941 static __init void __check_quirks_intel(void) 942 { 943 switch (boot_cpu_data.x86_vfm) { 944 case INTEL_HASWELL_X: 945 if (!rdt_options[RDT_FLAG_L3_CAT].force_off) 946 cache_alloc_hsw_probe(); 947 break; 948 case INTEL_SKYLAKE_X: 949 if (boot_cpu_data.x86_stepping <= 4) 950 set_rdt_options("!cmt,!mbmtotal,!mbmlocal,!l3cat"); 951 else 952 set_rdt_options("!l3cat"); 953 fallthrough; 954 case INTEL_BROADWELL_X: 955 intel_rdt_mbm_apply_quirk(); 956 break; 957 } 958 } 959 960 static __init void check_quirks(void) 961 { 962 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) 963 __check_quirks_intel(); 964 } 965 966 static __init bool get_rdt_resources(void) 967 { 968 rdt_alloc_capable = get_rdt_alloc_resources(); 969 rdt_mon_capable = get_rdt_mon_resources(); 970 971 return (rdt_mon_capable || rdt_alloc_capable); 972 } 973 974 static __init void rdt_init_res_defs_intel(void) 975 { 976 struct rdt_hw_resource *hw_res; 977 struct rdt_resource *r; 978 979 for_each_rdt_resource(r) { 980 hw_res = resctrl_to_arch_res(r); 981 982 if (r->rid == RDT_RESOURCE_L3 || 983 r->rid == RDT_RESOURCE_L2) { 984 r->cache.arch_has_per_cpu_cfg = false; 985 r->cache.min_cbm_bits = 1; 986 } else if (r->rid == RDT_RESOURCE_MBA) { 987 hw_res->msr_base = MSR_IA32_MBA_THRTL_BASE; 988 hw_res->msr_update = mba_wrmsr_intel; 989 } 990 } 991 } 992 993 static __init void rdt_init_res_defs_amd(void) 994 { 995 struct rdt_hw_resource *hw_res; 996 struct rdt_resource *r; 997 998 for_each_rdt_resource(r) { 999 hw_res = resctrl_to_arch_res(r); 1000 1001 if (r->rid == RDT_RESOURCE_L3 || 1002 r->rid == RDT_RESOURCE_L2) { 1003 r->cache.arch_has_sparse_bitmasks = true; 1004 r->cache.arch_has_per_cpu_cfg = true; 1005 r->cache.min_cbm_bits = 0; 1006 } else if (r->rid == RDT_RESOURCE_MBA) { 1007 hw_res->msr_base = MSR_IA32_MBA_BW_BASE; 1008 hw_res->msr_update = mba_wrmsr_amd; 1009 } else if (r->rid == RDT_RESOURCE_SMBA) { 1010 hw_res->msr_base = MSR_IA32_SMBA_BW_BASE; 1011 hw_res->msr_update = mba_wrmsr_amd; 1012 } 1013 } 1014 } 1015 1016 static __init void rdt_init_res_defs(void) 1017 { 1018 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) 1019 rdt_init_res_defs_intel(); 1020 else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) 1021 rdt_init_res_defs_amd(); 1022 } 1023 1024 static enum cpuhp_state rdt_online; 1025 1026 /* Runs once on the BSP during boot. */ 1027 void resctrl_cpu_detect(struct cpuinfo_x86 *c) 1028 { 1029 if (!cpu_has(c, X86_FEATURE_CQM_LLC) && !cpu_has(c, X86_FEATURE_ABMC)) { 1030 c->x86_cache_max_rmid = -1; 1031 c->x86_cache_occ_scale = -1; 1032 c->x86_cache_mbm_width_offset = -1; 1033 return; 1034 } 1035 1036 /* will be overridden if occupancy monitoring exists */ 1037 c->x86_cache_max_rmid = cpuid_ebx(0xf); 1038 1039 if (cpu_has(c, X86_FEATURE_CQM_OCCUP_LLC) || 1040 cpu_has(c, X86_FEATURE_CQM_MBM_TOTAL) || 1041 cpu_has(c, X86_FEATURE_CQM_MBM_LOCAL) || 1042 cpu_has(c, X86_FEATURE_ABMC)) { 1043 u32 eax, ebx, ecx, edx; 1044 1045 /* QoS sub-leaf, EAX=0Fh, ECX=1 */ 1046 cpuid_count(0xf, 1, &eax, &ebx, &ecx, &edx); 1047 1048 c->x86_cache_max_rmid = ecx; 1049 c->x86_cache_occ_scale = ebx; 1050 c->x86_cache_mbm_width_offset = eax & 0xff; 1051 1052 if (c->x86_vendor == X86_VENDOR_AMD && !c->x86_cache_mbm_width_offset) 1053 c->x86_cache_mbm_width_offset = MBM_CNTR_WIDTH_OFFSET_AMD; 1054 } 1055 } 1056 1057 static int __init resctrl_arch_late_init(void) 1058 { 1059 struct rdt_resource *r; 1060 int state, ret, i; 1061 1062 /* for_each_rdt_resource() requires all rid to be initialised. */ 1063 for (i = 0; i < RDT_NUM_RESOURCES; i++) 1064 rdt_resources_all[i].r_resctrl.rid = i; 1065 1066 /* 1067 * Initialize functions(or definitions) that are different 1068 * between vendors here. 1069 */ 1070 rdt_init_res_defs(); 1071 1072 check_quirks(); 1073 1074 if (!get_rdt_resources()) 1075 return -ENODEV; 1076 1077 state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, 1078 "x86/resctrl/cat:online:", 1079 resctrl_arch_online_cpu, 1080 resctrl_arch_offline_cpu); 1081 if (state < 0) 1082 return state; 1083 1084 ret = resctrl_init(); 1085 if (ret) { 1086 cpuhp_remove_state(state); 1087 return ret; 1088 } 1089 rdt_online = state; 1090 1091 for_each_alloc_capable_rdt_resource(r) 1092 pr_info("%s allocation detected\n", r->name); 1093 1094 for_each_mon_capable_rdt_resource(r) 1095 pr_info("%s monitoring detected\n", r->name); 1096 1097 return 0; 1098 } 1099 1100 late_initcall(resctrl_arch_late_init); 1101 1102 static void __exit resctrl_arch_exit(void) 1103 { 1104 intel_aet_exit(); 1105 1106 cpuhp_remove_state(rdt_online); 1107 1108 resctrl_exit(); 1109 } 1110 1111 __exitcall(resctrl_arch_exit); 1112