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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * acpi_numa.c - ACPI NUMA support4 *5 * Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com>6 */7 8#define pr_fmt(fmt) "ACPI: " fmt9 10#include <linux/module.h>11#include <linux/init.h>12#include <linux/kernel.h>13#include <linux/types.h>14#include <linux/errno.h>15#include <linux/acpi.h>16#include <linux/memblock.h>17#include <linux/numa.h>18#include <linux/nodemask.h>19#include <linux/topology.h>20#include <linux/numa_memblks.h>21 22static nodemask_t nodes_found_map = NODE_MASK_NONE;23 24/* maps to convert between proximity domain and logical node ID */25static int pxm_to_node_map[MAX_PXM_DOMAINS]26 = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };27static int node_to_pxm_map[MAX_NUMNODES]28 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };29 30unsigned char acpi_srat_revision __initdata;31static int acpi_numa __initdata;32 33static int last_real_pxm;34 35void __init disable_srat(void)36{37 acpi_numa = -1;38}39 40int pxm_to_node(int pxm)41{42 if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off)43 return NUMA_NO_NODE;44 return pxm_to_node_map[pxm];45}46EXPORT_SYMBOL(pxm_to_node);47 48int node_to_pxm(int node)49{50 if (node < 0)51 return PXM_INVAL;52 return node_to_pxm_map[node];53}54 55static void __acpi_map_pxm_to_node(int pxm, int node)56{57 if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])58 pxm_to_node_map[pxm] = node;59 if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])60 node_to_pxm_map[node] = pxm;61}62 63int acpi_map_pxm_to_node(int pxm)64{65 int node;66 67 if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off)68 return NUMA_NO_NODE;69 70 node = pxm_to_node_map[pxm];71 72 if (node == NUMA_NO_NODE) {73 node = first_unset_node(nodes_found_map);74 if (node >= MAX_NUMNODES)75 return NUMA_NO_NODE;76 __acpi_map_pxm_to_node(pxm, node);77 node_set(node, nodes_found_map);78 }79 80 return node;81}82EXPORT_SYMBOL(acpi_map_pxm_to_node);83 84static void __init85acpi_table_print_srat_entry(struct acpi_subtable_header *header)86{87 switch (header->type) {88 case ACPI_SRAT_TYPE_CPU_AFFINITY:89 {90 struct acpi_srat_cpu_affinity *p =91 (struct acpi_srat_cpu_affinity *)header;92 pr_debug("SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",93 p->apic_id, p->local_sapic_eid,94 p->proximity_domain_lo,95 (p->flags & ACPI_SRAT_CPU_ENABLED) ?96 "enabled" : "disabled");97 }98 break;99 100 case ACPI_SRAT_TYPE_MEMORY_AFFINITY:101 {102 struct acpi_srat_mem_affinity *p =103 (struct acpi_srat_mem_affinity *)header;104 pr_debug("SRAT Memory (0x%llx length 0x%llx) in proximity domain %d %s%s%s\n",105 (unsigned long long)p->base_address,106 (unsigned long long)p->length,107 p->proximity_domain,108 (p->flags & ACPI_SRAT_MEM_ENABLED) ?109 "enabled" : "disabled",110 (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?111 " hot-pluggable" : "",112 (p->flags & ACPI_SRAT_MEM_NON_VOLATILE) ?113 " non-volatile" : "");114 }115 break;116 117 case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:118 {119 struct acpi_srat_x2apic_cpu_affinity *p =120 (struct acpi_srat_x2apic_cpu_affinity *)header;121 pr_debug("SRAT Processor (x2apicid[0x%08x]) in proximity domain %d %s\n",122 p->apic_id,123 p->proximity_domain,124 (p->flags & ACPI_SRAT_CPU_ENABLED) ?125 "enabled" : "disabled");126 }127 break;128 129 case ACPI_SRAT_TYPE_GICC_AFFINITY:130 {131 struct acpi_srat_gicc_affinity *p =132 (struct acpi_srat_gicc_affinity *)header;133 pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n",134 p->acpi_processor_uid,135 p->proximity_domain,136 (p->flags & ACPI_SRAT_GICC_ENABLED) ?137 "enabled" : "disabled");138 }139 break;140 141 case ACPI_SRAT_TYPE_GENERIC_AFFINITY:142 {143 struct acpi_srat_generic_affinity *p =144 (struct acpi_srat_generic_affinity *)header;145 146 if (p->device_handle_type == 0) {147 /*148 * For pci devices this may be the only place they149 * are assigned a proximity domain150 */151 pr_debug("SRAT Generic Initiator(Seg:%u BDF:%u) in proximity domain %d %s\n",152 *(u16 *)(&p->device_handle[0]),153 *(u16 *)(&p->device_handle[2]),154 p->proximity_domain,155 (p->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED) ?156 "enabled" : "disabled");157 } else {158 /*159 * In this case we can rely on the device having a160 * proximity domain reference161 */162 pr_debug("SRAT Generic Initiator(HID=%.8s UID=%.4s) in proximity domain %d %s\n",163 (char *)(&p->device_handle[0]),164 (char *)(&p->device_handle[8]),165 p->proximity_domain,166 (p->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED) ?167 "enabled" : "disabled");168 }169 }170 break;171 172 case ACPI_SRAT_TYPE_RINTC_AFFINITY:173 {174 struct acpi_srat_rintc_affinity *p =175 (struct acpi_srat_rintc_affinity *)header;176 pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n",177 p->acpi_processor_uid,178 p->proximity_domain,179 (p->flags & ACPI_SRAT_RINTC_ENABLED) ?180 "enabled" : "disabled");181 }182 break;183 184 default:185 pr_warn("Found unsupported SRAT entry (type = 0x%x)\n",186 header->type);187 break;188 }189}190 191/*192 * A lot of BIOS fill in 10 (= no distance) everywhere. This messes193 * up the NUMA heuristics which wants the local node to have a smaller194 * distance than the others.195 * Do some quick checks here and only use the SLIT if it passes.196 */197static int __init slit_valid(struct acpi_table_slit *slit)198{199 int i, j;200 int d = slit->locality_count;201 for (i = 0; i < d; i++) {202 for (j = 0; j < d; j++) {203 u8 val = slit->entry[d*i + j];204 if (i == j) {205 if (val != LOCAL_DISTANCE)206 return 0;207 } else if (val <= LOCAL_DISTANCE)208 return 0;209 }210 }211 return 1;212}213 214void __init bad_srat(void)215{216 pr_err("SRAT: SRAT not used.\n");217 disable_srat();218}219 220int __init srat_disabled(void)221{222 return acpi_numa < 0;223}224 225__weak int __init numa_fill_memblks(u64 start, u64 end)226{227 return NUMA_NO_MEMBLK;228}229 230/*231 * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for232 * I/O localities since SRAT does not list them. I/O localities are233 * not supported at this point.234 */235static int __init acpi_parse_slit(struct acpi_table_header *table)236{237 struct acpi_table_slit *slit = (struct acpi_table_slit *)table;238 int i, j;239 240 if (!slit_valid(slit)) {241 pr_info("SLIT table looks invalid. Not used.\n");242 return -EINVAL;243 }244 245 for (i = 0; i < slit->locality_count; i++) {246 const int from_node = pxm_to_node(i);247 248 if (from_node == NUMA_NO_NODE)249 continue;250 251 for (j = 0; j < slit->locality_count; j++) {252 const int to_node = pxm_to_node(j);253 254 if (to_node == NUMA_NO_NODE)255 continue;256 257 numa_set_distance(from_node, to_node,258 slit->entry[slit->locality_count * i + j]);259 }260 }261 262 return 0;263}264 265static int parsed_numa_memblks __initdata;266 267static int __init268acpi_parse_memory_affinity(union acpi_subtable_headers *header,269 const unsigned long table_end)270{271 struct acpi_srat_mem_affinity *ma;272 u64 start, end;273 u32 hotpluggable;274 int node, pxm;275 276 ma = (struct acpi_srat_mem_affinity *)header;277 278 acpi_table_print_srat_entry(&header->common);279 280 if (srat_disabled())281 return 0;282 if (ma->header.length < sizeof(struct acpi_srat_mem_affinity)) {283 pr_err("SRAT: Unexpected header length: %d\n",284 ma->header.length);285 goto out_err_bad_srat;286 }287 if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)288 return 0;289 hotpluggable = IS_ENABLED(CONFIG_MEMORY_HOTPLUG) &&290 (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE);291 292 start = ma->base_address;293 end = start + ma->length;294 pxm = ma->proximity_domain;295 if (acpi_srat_revision <= 1)296 pxm &= 0xff;297 298 node = acpi_map_pxm_to_node(pxm);299 if (node == NUMA_NO_NODE) {300 pr_err("SRAT: Too many proximity domains.\n");301 goto out_err_bad_srat;302 }303 304 if (numa_add_memblk(node, start, end) < 0) {305 pr_err("SRAT: Failed to add memblk to node %u [mem %#010Lx-%#010Lx]\n",306 node, (unsigned long long) start,307 (unsigned long long) end - 1);308 goto out_err_bad_srat;309 }310 311 node_set(node, numa_nodes_parsed);312 313 pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s%s\n",314 node, pxm,315 (unsigned long long) start, (unsigned long long) end - 1,316 hotpluggable ? " hotplug" : "",317 ma->flags & ACPI_SRAT_MEM_NON_VOLATILE ? " non-volatile" : "");318 319 /* Mark hotplug range in memblock. */320 if (hotpluggable && memblock_mark_hotplug(start, ma->length))321 pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n",322 (unsigned long long)start, (unsigned long long)end - 1);323 324 max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1));325 326 parsed_numa_memblks++;327 328 return 0;329 330out_err_bad_srat:331 /* Just disable SRAT, but do not fail and ignore errors. */332 bad_srat();333 334 return 0;335}336 337static int __init acpi_parse_cfmws(union acpi_subtable_headers *header,338 void *arg, const unsigned long table_end)339{340 struct acpi_cedt_cfmws *cfmws;341 int *fake_pxm = arg;342 u64 start, end;343 int node;344 345 cfmws = (struct acpi_cedt_cfmws *)header;346 start = cfmws->base_hpa;347 end = cfmws->base_hpa + cfmws->window_size;348 349 /*350 * The SRAT may have already described NUMA details for all,351 * or a portion of, this CFMWS HPA range. Extend the memblks352 * found for any portion of the window to cover the entire353 * window.354 */355 if (!numa_fill_memblks(start, end))356 return 0;357 358 /* No SRAT description. Create a new node. */359 node = acpi_map_pxm_to_node(*fake_pxm);360 361 if (node == NUMA_NO_NODE) {362 pr_err("ACPI NUMA: Too many proximity domains while processing CFMWS.\n");363 return -EINVAL;364 }365 366 if (numa_add_memblk(node, start, end) < 0) {367 /* CXL driver must handle the NUMA_NO_NODE case */368 pr_warn("ACPI NUMA: Failed to add memblk for CFMWS node %d [mem %#llx-%#llx]\n",369 node, start, end);370 }371 node_set(node, numa_nodes_parsed);372 373 /* Set the next available fake_pxm value */374 (*fake_pxm)++;375 return 0;376}377 378void __init __weak379acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)380{381 pr_warn("Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);382}383 384static int __init385acpi_parse_x2apic_affinity(union acpi_subtable_headers *header,386 const unsigned long end)387{388 struct acpi_srat_x2apic_cpu_affinity *processor_affinity;389 390 processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;391 392 acpi_table_print_srat_entry(&header->common);393 394 /* let architecture-dependent part to do it */395 acpi_numa_x2apic_affinity_init(processor_affinity);396 397 return 0;398}399 400static int __init401acpi_parse_processor_affinity(union acpi_subtable_headers *header,402 const unsigned long end)403{404 struct acpi_srat_cpu_affinity *processor_affinity;405 406 processor_affinity = (struct acpi_srat_cpu_affinity *)header;407 408 acpi_table_print_srat_entry(&header->common);409 410 /* let architecture-dependent part to do it */411 acpi_numa_processor_affinity_init(processor_affinity);412 413 return 0;414}415 416static int __init417acpi_parse_gicc_affinity(union acpi_subtable_headers *header,418 const unsigned long end)419{420 struct acpi_srat_gicc_affinity *processor_affinity;421 422 processor_affinity = (struct acpi_srat_gicc_affinity *)header;423 424 acpi_table_print_srat_entry(&header->common);425 426 /* let architecture-dependent part to do it */427 acpi_numa_gicc_affinity_init(processor_affinity);428 429 return 0;430}431 432#if defined(CONFIG_X86) || defined(CONFIG_ARM64)433static int __init434acpi_parse_gi_affinity(union acpi_subtable_headers *header,435 const unsigned long end)436{437 struct acpi_srat_generic_affinity *gi_affinity;438 int node;439 440 gi_affinity = (struct acpi_srat_generic_affinity *)header;441 if (!gi_affinity)442 return -EINVAL;443 acpi_table_print_srat_entry(&header->common);444 445 if (!(gi_affinity->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED))446 return -EINVAL;447 448 node = acpi_map_pxm_to_node(gi_affinity->proximity_domain);449 if (node == NUMA_NO_NODE) {450 pr_err("SRAT: Too many proximity domains.\n");451 return -EINVAL;452 }453 node_set(node, numa_nodes_parsed);454 node_set_state(node, N_GENERIC_INITIATOR);455 456 return 0;457}458#else459static int __init460acpi_parse_gi_affinity(union acpi_subtable_headers *header,461 const unsigned long end)462{463 return 0;464}465#endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */466 467static int __init468acpi_parse_rintc_affinity(union acpi_subtable_headers *header,469 const unsigned long end)470{471 struct acpi_srat_rintc_affinity *rintc_affinity;472 473 rintc_affinity = (struct acpi_srat_rintc_affinity *)header;474 acpi_table_print_srat_entry(&header->common);475 476 /* let architecture-dependent part to do it */477 acpi_numa_rintc_affinity_init(rintc_affinity);478 479 return 0;480}481 482static int __init acpi_parse_srat(struct acpi_table_header *table)483{484 struct acpi_table_srat *srat = (struct acpi_table_srat *)table;485 486 acpi_srat_revision = srat->header.revision;487 488 /* Real work done in acpi_table_parse_srat below. */489 490 return 0;491}492 493static int __init494acpi_table_parse_srat(enum acpi_srat_type id,495 acpi_tbl_entry_handler handler, unsigned int max_entries)496{497 return acpi_table_parse_entries(ACPI_SIG_SRAT,498 sizeof(struct acpi_table_srat), id,499 handler, max_entries);500}501 502int __init acpi_numa_init(void)503{504 int i, fake_pxm, cnt = 0;505 506 if (acpi_disabled)507 return -EINVAL;508 509 /*510 * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=511 * SRAT cpu entries could have different order with that in MADT.512 * So go over all cpu entries in SRAT to get apicid to node mapping.513 */514 515 /* SRAT: System Resource Affinity Table */516 if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {517 struct acpi_subtable_proc srat_proc[5];518 519 memset(srat_proc, 0, sizeof(srat_proc));520 srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY;521 srat_proc[0].handler = acpi_parse_processor_affinity;522 srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY;523 srat_proc[1].handler = acpi_parse_x2apic_affinity;524 srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY;525 srat_proc[2].handler = acpi_parse_gicc_affinity;526 srat_proc[3].id = ACPI_SRAT_TYPE_GENERIC_AFFINITY;527 srat_proc[3].handler = acpi_parse_gi_affinity;528 srat_proc[4].id = ACPI_SRAT_TYPE_RINTC_AFFINITY;529 srat_proc[4].handler = acpi_parse_rintc_affinity;530 531 acpi_table_parse_entries_array(ACPI_SIG_SRAT,532 sizeof(struct acpi_table_srat),533 srat_proc, ARRAY_SIZE(srat_proc), 0);534 535 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,536 acpi_parse_memory_affinity, 0);537 }538 539 /* SLIT: System Locality Information Table */540 acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);541 542 /*543 * CXL Fixed Memory Window Structures (CFMWS) must be parsed544 * after the SRAT. Create NUMA Nodes for CXL memory ranges that545 * are defined in the CFMWS and not already defined in the SRAT.546 * Initialize a fake_pxm as the first available PXM to emulate.547 */548 549 /* fake_pxm is the next unused PXM value after SRAT parsing */550 for (i = 0, fake_pxm = -1; i < MAX_NUMNODES; i++) {551 if (node_to_pxm_map[i] > fake_pxm)552 fake_pxm = node_to_pxm_map[i];553 }554 last_real_pxm = fake_pxm;555 fake_pxm++;556 acpi_table_parse_cedt(ACPI_CEDT_TYPE_CFMWS, acpi_parse_cfmws,557 &fake_pxm);558 559 if (cnt < 0)560 return cnt;561 else if (!parsed_numa_memblks)562 return -ENOENT;563 return 0;564}565 566bool acpi_node_backed_by_real_pxm(int nid)567{568 int pxm = node_to_pxm(nid);569 570 return pxm <= last_real_pxm;571}572EXPORT_SYMBOL_GPL(acpi_node_backed_by_real_pxm);573 574static int acpi_get_pxm(acpi_handle h)575{576 unsigned long long pxm;577 acpi_status status;578 acpi_handle handle;579 acpi_handle phandle = h;580 581 do {582 handle = phandle;583 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);584 if (ACPI_SUCCESS(status))585 return pxm;586 status = acpi_get_parent(handle, &phandle);587 } while (ACPI_SUCCESS(status));588 return -1;589}590 591int acpi_get_node(acpi_handle handle)592{593 int pxm;594 595 pxm = acpi_get_pxm(handle);596 597 return pxm_to_node(pxm);598}599EXPORT_SYMBOL(acpi_get_node);600