1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2010 Hudson River Trading LLC 5 * Written by: John H. Baldwin <jhb@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include "opt_vm.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/bus.h> 38 #include <sys/kernel.h> 39 #include <sys/lock.h> 40 #include <sys/mutex.h> 41 #include <sys/smp.h> 42 #include <sys/vmmeter.h> 43 #include <vm/vm.h> 44 #include <vm/pmap.h> 45 #include <vm/vm_param.h> 46 #include <vm/vm_page.h> 47 #include <vm/vm_phys.h> 48 49 #include <contrib/dev/acpica/include/acpi.h> 50 #include <contrib/dev/acpica/include/aclocal.h> 51 #include <contrib/dev/acpica/include/actables.h> 52 53 #include <machine/intr_machdep.h> 54 #include <machine/md_var.h> 55 #include <x86/apicvar.h> 56 57 #include <dev/acpica/acpivar.h> 58 59 #if MAXMEMDOM > 1 60 static struct cpu_info { 61 int enabled:1; 62 int has_memory:1; 63 int domain; 64 } *cpus; 65 66 struct mem_affinity mem_info[VM_PHYSSEG_MAX + 1]; 67 int num_mem; 68 69 static ACPI_TABLE_SRAT *srat; 70 static vm_paddr_t srat_physaddr; 71 72 static int domain_pxm[MAXMEMDOM]; 73 static int ndomain; 74 75 static ACPI_TABLE_SLIT *slit; 76 static vm_paddr_t slit_physaddr; 77 static int vm_locality_table[MAXMEMDOM * MAXMEMDOM]; 78 79 static void srat_walk_table(acpi_subtable_handler *handler, void *arg); 80 81 /* 82 * SLIT parsing. 83 */ 84 85 static void 86 slit_parse_table(ACPI_TABLE_SLIT *s) 87 { 88 int i, j; 89 int i_domain, j_domain; 90 int offset = 0; 91 uint8_t e; 92 93 /* 94 * This maps the SLIT data into the VM-domain centric view. 95 * There may be sparse entries in the PXM namespace, so 96 * remap them to a VM-domain ID and if it doesn't exist, 97 * skip it. 98 * 99 * It should result in a packed 2d array of VM-domain 100 * locality information entries. 101 */ 102 103 if (bootverbose) 104 printf("SLIT.Localities: %d\n", (int) s->LocalityCount); 105 for (i = 0; i < s->LocalityCount; i++) { 106 i_domain = acpi_map_pxm_to_vm_domainid(i); 107 if (i_domain < 0) 108 continue; 109 110 if (bootverbose) 111 printf("%d: ", i); 112 for (j = 0; j < s->LocalityCount; j++) { 113 j_domain = acpi_map_pxm_to_vm_domainid(j); 114 if (j_domain < 0) 115 continue; 116 e = s->Entry[i * s->LocalityCount + j]; 117 if (bootverbose) 118 printf("%d ", (int) e); 119 /* 255 == "no locality information" */ 120 if (e == 255) 121 vm_locality_table[offset] = -1; 122 else 123 vm_locality_table[offset] = e; 124 offset++; 125 } 126 if (bootverbose) 127 printf("\n"); 128 } 129 } 130 131 /* 132 * Look for an ACPI System Locality Distance Information Table ("SLIT") 133 */ 134 static int 135 parse_slit(void) 136 { 137 138 if (resource_disabled("slit", 0)) { 139 return (-1); 140 } 141 142 slit_physaddr = acpi_find_table(ACPI_SIG_SLIT); 143 if (slit_physaddr == 0) { 144 return (-1); 145 } 146 147 /* 148 * Make a pass over the table to populate the cpus[] and 149 * mem_info[] tables. 150 */ 151 slit = acpi_map_table(slit_physaddr, ACPI_SIG_SLIT); 152 slit_parse_table(slit); 153 acpi_unmap_table(slit); 154 slit = NULL; 155 156 return (0); 157 } 158 159 /* 160 * SRAT parsing. 161 */ 162 163 /* 164 * Returns true if a memory range overlaps with at least one range in 165 * phys_avail[]. 166 */ 167 static int 168 overlaps_phys_avail(vm_paddr_t start, vm_paddr_t end) 169 { 170 int i; 171 172 for (i = 0; phys_avail[i] != 0 && phys_avail[i + 1] != 0; i += 2) { 173 if (phys_avail[i + 1] <= start) 174 continue; 175 if (phys_avail[i] < end) 176 return (1); 177 break; 178 } 179 return (0); 180 181 } 182 183 static void 184 srat_parse_entry(ACPI_SUBTABLE_HEADER *entry, void *arg) 185 { 186 ACPI_SRAT_CPU_AFFINITY *cpu; 187 ACPI_SRAT_X2APIC_CPU_AFFINITY *x2apic; 188 ACPI_SRAT_MEM_AFFINITY *mem; 189 int domain, i, slot; 190 191 switch (entry->Type) { 192 case ACPI_SRAT_TYPE_CPU_AFFINITY: 193 cpu = (ACPI_SRAT_CPU_AFFINITY *)entry; 194 domain = cpu->ProximityDomainLo | 195 cpu->ProximityDomainHi[0] << 8 | 196 cpu->ProximityDomainHi[1] << 16 | 197 cpu->ProximityDomainHi[2] << 24; 198 if (bootverbose) 199 printf("SRAT: Found CPU APIC ID %u domain %d: %s\n", 200 cpu->ApicId, domain, 201 (cpu->Flags & ACPI_SRAT_CPU_ENABLED) ? 202 "enabled" : "disabled"); 203 if (!(cpu->Flags & ACPI_SRAT_CPU_ENABLED)) 204 break; 205 if (cpu->ApicId > max_apic_id) { 206 printf("SRAT: Ignoring local APIC ID %u (too high)\n", 207 cpu->ApicId); 208 break; 209 } 210 211 if (cpus[cpu->ApicId].enabled) { 212 printf("SRAT: Duplicate local APIC ID %u\n", 213 cpu->ApicId); 214 *(int *)arg = ENXIO; 215 break; 216 } 217 cpus[cpu->ApicId].domain = domain; 218 cpus[cpu->ApicId].enabled = 1; 219 break; 220 case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY: 221 x2apic = (ACPI_SRAT_X2APIC_CPU_AFFINITY *)entry; 222 if (bootverbose) 223 printf("SRAT: Found CPU APIC ID %u domain %d: %s\n", 224 x2apic->ApicId, x2apic->ProximityDomain, 225 (x2apic->Flags & ACPI_SRAT_CPU_ENABLED) ? 226 "enabled" : "disabled"); 227 if (!(x2apic->Flags & ACPI_SRAT_CPU_ENABLED)) 228 break; 229 if (x2apic->ApicId > max_apic_id) { 230 printf("SRAT: Ignoring local APIC ID %u (too high)\n", 231 x2apic->ApicId); 232 break; 233 } 234 235 KASSERT(!cpus[x2apic->ApicId].enabled, 236 ("Duplicate local APIC ID %u", x2apic->ApicId)); 237 cpus[x2apic->ApicId].domain = x2apic->ProximityDomain; 238 cpus[x2apic->ApicId].enabled = 1; 239 break; 240 case ACPI_SRAT_TYPE_MEMORY_AFFINITY: 241 mem = (ACPI_SRAT_MEM_AFFINITY *)entry; 242 if (bootverbose) 243 printf( 244 "SRAT: Found memory domain %d addr 0x%jx len 0x%jx: %s\n", 245 mem->ProximityDomain, (uintmax_t)mem->BaseAddress, 246 (uintmax_t)mem->Length, 247 (mem->Flags & ACPI_SRAT_MEM_ENABLED) ? 248 "enabled" : "disabled"); 249 if (!(mem->Flags & ACPI_SRAT_MEM_ENABLED)) 250 break; 251 if (mem->BaseAddress >= cpu_getmaxphyaddr() || 252 !overlaps_phys_avail(mem->BaseAddress, 253 mem->BaseAddress + mem->Length)) { 254 printf("SRAT: Ignoring memory at addr 0x%jx\n", 255 (uintmax_t)mem->BaseAddress); 256 break; 257 } 258 if (num_mem == VM_PHYSSEG_MAX) { 259 printf("SRAT: Too many memory regions\n"); 260 *(int *)arg = ENXIO; 261 break; 262 } 263 slot = num_mem; 264 for (i = 0; i < num_mem; i++) { 265 if (mem_info[i].end <= mem->BaseAddress) 266 continue; 267 if (mem_info[i].start < 268 (mem->BaseAddress + mem->Length)) { 269 printf("SRAT: Overlapping memory entries\n"); 270 *(int *)arg = ENXIO; 271 return; 272 } 273 slot = i; 274 } 275 for (i = num_mem; i > slot; i--) 276 mem_info[i] = mem_info[i - 1]; 277 mem_info[slot].start = mem->BaseAddress; 278 mem_info[slot].end = mem->BaseAddress + mem->Length; 279 mem_info[slot].domain = mem->ProximityDomain; 280 num_mem++; 281 break; 282 } 283 } 284 285 /* 286 * Ensure each memory domain has at least one CPU and that each CPU 287 * has at least one memory domain. 288 */ 289 static int 290 check_domains(void) 291 { 292 int found, i, j; 293 294 for (i = 0; i < num_mem; i++) { 295 found = 0; 296 for (j = 0; j <= max_apic_id; j++) 297 if (cpus[j].enabled && 298 cpus[j].domain == mem_info[i].domain) { 299 cpus[j].has_memory = 1; 300 found++; 301 } 302 if (!found) { 303 printf("SRAT: No CPU found for memory domain %d\n", 304 mem_info[i].domain); 305 return (ENXIO); 306 } 307 } 308 for (i = 0; i <= max_apic_id; i++) 309 if (cpus[i].enabled && !cpus[i].has_memory) { 310 found = 0; 311 for (j = 0; j < num_mem && !found; j++) { 312 if (mem_info[j].domain == cpus[i].domain) 313 found = 1; 314 } 315 if (!found) { 316 if (bootverbose) 317 printf("SRAT: mem dom %d is empty\n", 318 cpus[i].domain); 319 mem_info[num_mem].start = 0; 320 mem_info[num_mem].end = 0; 321 mem_info[num_mem].domain = cpus[i].domain; 322 num_mem++; 323 } 324 } 325 return (0); 326 } 327 328 /* 329 * Check that the SRAT memory regions cover all of the regions in 330 * phys_avail[]. 331 */ 332 static int 333 check_phys_avail(void) 334 { 335 vm_paddr_t address; 336 int i, j; 337 338 /* j is the current offset into phys_avail[]. */ 339 address = phys_avail[0]; 340 j = 0; 341 for (i = 0; i < num_mem; i++) { 342 /* 343 * Consume as many phys_avail[] entries as fit in this 344 * region. 345 */ 346 while (address >= mem_info[i].start && 347 address <= mem_info[i].end) { 348 /* 349 * If we cover the rest of this phys_avail[] entry, 350 * advance to the next entry. 351 */ 352 if (phys_avail[j + 1] <= mem_info[i].end) { 353 j += 2; 354 if (phys_avail[j] == 0 && 355 phys_avail[j + 1] == 0) { 356 return (0); 357 } 358 address = phys_avail[j]; 359 } else 360 address = mem_info[i].end + 1; 361 } 362 } 363 printf("SRAT: No memory region found for 0x%jx - 0x%jx\n", 364 (uintmax_t)phys_avail[j], (uintmax_t)phys_avail[j + 1]); 365 return (ENXIO); 366 } 367 368 /* 369 * Renumber the memory domains to be compact and zero-based if not 370 * already. Returns an error if there are too many domains. 371 */ 372 static int 373 renumber_domains(void) 374 { 375 int i, j, slot; 376 377 /* Enumerate all the domains. */ 378 ndomain = 0; 379 for (i = 0; i < num_mem; i++) { 380 /* See if this domain is already known. */ 381 for (j = 0; j < ndomain; j++) { 382 if (domain_pxm[j] >= mem_info[i].domain) 383 break; 384 } 385 if (j < ndomain && domain_pxm[j] == mem_info[i].domain) 386 continue; 387 388 if (ndomain >= MAXMEMDOM) { 389 ndomain = 1; 390 printf("SRAT: Too many memory domains\n"); 391 return (EFBIG); 392 } 393 394 /* Insert the new domain at slot 'j'. */ 395 slot = j; 396 for (j = ndomain; j > slot; j--) 397 domain_pxm[j] = domain_pxm[j - 1]; 398 domain_pxm[slot] = mem_info[i].domain; 399 ndomain++; 400 } 401 402 /* Renumber each domain to its index in the sorted 'domain_pxm' list. */ 403 for (i = 0; i < ndomain; i++) { 404 /* 405 * If the domain is already the right value, no need 406 * to renumber. 407 */ 408 if (domain_pxm[i] == i) 409 continue; 410 411 /* Walk the cpu[] and mem_info[] arrays to renumber. */ 412 for (j = 0; j < num_mem; j++) 413 if (mem_info[j].domain == domain_pxm[i]) 414 mem_info[j].domain = i; 415 for (j = 0; j <= max_apic_id; j++) 416 if (cpus[j].enabled && cpus[j].domain == domain_pxm[i]) 417 cpus[j].domain = i; 418 } 419 420 return (0); 421 } 422 423 /* 424 * Look for an ACPI System Resource Affinity Table ("SRAT") 425 */ 426 static int 427 parse_srat(void) 428 { 429 unsigned int idx, size; 430 vm_paddr_t addr; 431 int error; 432 433 if (resource_disabled("srat", 0)) 434 return (-1); 435 436 srat_physaddr = acpi_find_table(ACPI_SIG_SRAT); 437 if (srat_physaddr == 0) 438 return (-1); 439 440 /* 441 * Allocate data structure: 442 * 443 * Find the last physical memory region and steal some memory from 444 * it. This is done because at this point in the boot process 445 * malloc is still not usable. 446 */ 447 for (idx = 0; phys_avail[idx + 1] != 0; idx += 2); 448 KASSERT(idx != 0, ("phys_avail is empty!")); 449 idx -= 2; 450 451 size = sizeof(*cpus) * (max_apic_id + 1); 452 addr = trunc_page(phys_avail[idx + 1] - size); 453 KASSERT(addr >= phys_avail[idx], 454 ("Not enough memory for SRAT table items")); 455 phys_avail[idx + 1] = addr - 1; 456 457 /* 458 * We cannot rely on PHYS_TO_DMAP because this code is also used in 459 * i386, so use pmap_mapbios to map the memory, this will end up using 460 * the default memory attribute (WB), and the DMAP when available. 461 */ 462 cpus = (struct cpu_info *)pmap_mapbios(addr, size); 463 bzero(cpus, size); 464 465 /* 466 * Make a pass over the table to populate the cpus[] and 467 * mem_info[] tables. 468 */ 469 srat = acpi_map_table(srat_physaddr, ACPI_SIG_SRAT); 470 error = 0; 471 srat_walk_table(srat_parse_entry, &error); 472 acpi_unmap_table(srat); 473 srat = NULL; 474 if (error || check_domains() != 0 || check_phys_avail() != 0 || 475 renumber_domains() != 0) { 476 srat_physaddr = 0; 477 return (-1); 478 } 479 480 return (0); 481 } 482 483 static void 484 init_mem_locality(void) 485 { 486 int i; 487 488 /* 489 * For now, assume -1 == "no locality information for 490 * this pairing. 491 */ 492 for (i = 0; i < MAXMEMDOM * MAXMEMDOM; i++) 493 vm_locality_table[i] = -1; 494 } 495 496 static void 497 parse_acpi_tables(void *dummy) 498 { 499 500 if (parse_srat() < 0) 501 return; 502 init_mem_locality(); 503 (void)parse_slit(); 504 vm_phys_register_domains(ndomain, mem_info, vm_locality_table); 505 } 506 SYSINIT(parse_acpi_tables, SI_SUB_VM - 1, SI_ORDER_FIRST, parse_acpi_tables, 507 NULL); 508 509 static void 510 srat_walk_table(acpi_subtable_handler *handler, void *arg) 511 { 512 513 acpi_walk_subtables(srat + 1, (char *)srat + srat->Header.Length, 514 handler, arg); 515 } 516 517 /* 518 * Setup per-CPU domain IDs. 519 */ 520 static void 521 srat_set_cpus(void *dummy) 522 { 523 struct cpu_info *cpu; 524 struct pcpu *pc; 525 u_int i; 526 527 if (srat_physaddr == 0) 528 return; 529 for (i = 0; i < MAXCPU; i++) { 530 if (CPU_ABSENT(i)) 531 continue; 532 pc = pcpu_find(i); 533 KASSERT(pc != NULL, ("no pcpu data for CPU %u", i)); 534 cpu = &cpus[pc->pc_apic_id]; 535 if (!cpu->enabled) 536 panic("SRAT: CPU with APIC ID %u is not known", 537 pc->pc_apic_id); 538 pc->pc_domain = vm_ndomains > 1 ? cpu->domain : 0; 539 CPU_SET(i, &cpuset_domain[pc->pc_domain]); 540 if (bootverbose) 541 printf("SRAT: CPU %u has memory domain %d\n", i, 542 pc->pc_domain); 543 } 544 545 /* Last usage of the cpus array, unmap it. */ 546 pmap_unmapbios((vm_offset_t)cpus, sizeof(*cpus) * (max_apic_id + 1)); 547 cpus = NULL; 548 } 549 SYSINIT(srat_set_cpus, SI_SUB_CPU, SI_ORDER_ANY, srat_set_cpus, NULL); 550 551 /* 552 * Map a _PXM value to a VM domain ID. 553 * 554 * Returns the domain ID, or -1 if no domain ID was found. 555 */ 556 int 557 acpi_map_pxm_to_vm_domainid(int pxm) 558 { 559 int i; 560 561 for (i = 0; i < ndomain; i++) { 562 if (domain_pxm[i] == pxm) 563 return (vm_ndomains > 1 ? i : 0); 564 } 565 566 return (-1); 567 } 568 569 #else /* MAXMEMDOM == 1 */ 570 571 int 572 acpi_map_pxm_to_vm_domainid(int pxm) 573 { 574 575 return (-1); 576 } 577 578 #endif /* MAXMEMDOM > 1 */ 579