1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * acpi_numa.c - ACPI NUMA support 4 * 5 * Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com> 6 */ 7 8 #define pr_fmt(fmt) "ACPI: " fmt 9 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 21 static nodemask_t nodes_found_map = NODE_MASK_NONE; 22 23 /* maps to convert between proximity domain and logical node ID */ 24 static int pxm_to_node_map[MAX_PXM_DOMAINS] 25 = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE }; 26 static int node_to_pxm_map[MAX_NUMNODES] 27 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL }; 28 29 unsigned char acpi_srat_revision __initdata; 30 int acpi_numa __initdata; 31 32 int pxm_to_node(int pxm) 33 { 34 if (pxm < 0) 35 return NUMA_NO_NODE; 36 return pxm_to_node_map[pxm]; 37 } 38 EXPORT_SYMBOL(pxm_to_node); 39 40 int node_to_pxm(int node) 41 { 42 if (node < 0) 43 return PXM_INVAL; 44 return node_to_pxm_map[node]; 45 } 46 47 static void __acpi_map_pxm_to_node(int pxm, int node) 48 { 49 if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm]) 50 pxm_to_node_map[pxm] = node; 51 if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node]) 52 node_to_pxm_map[node] = pxm; 53 } 54 55 int acpi_map_pxm_to_node(int pxm) 56 { 57 int node; 58 59 if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off) 60 return NUMA_NO_NODE; 61 62 node = pxm_to_node_map[pxm]; 63 64 if (node == NUMA_NO_NODE) { 65 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES) 66 return NUMA_NO_NODE; 67 node = first_unset_node(nodes_found_map); 68 __acpi_map_pxm_to_node(pxm, node); 69 node_set(node, nodes_found_map); 70 } 71 72 return node; 73 } 74 EXPORT_SYMBOL(acpi_map_pxm_to_node); 75 76 static void __init 77 acpi_table_print_srat_entry(struct acpi_subtable_header *header) 78 { 79 switch (header->type) { 80 case ACPI_SRAT_TYPE_CPU_AFFINITY: 81 { 82 struct acpi_srat_cpu_affinity *p = 83 (struct acpi_srat_cpu_affinity *)header; 84 pr_debug("SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n", 85 p->apic_id, p->local_sapic_eid, 86 p->proximity_domain_lo, 87 (p->flags & ACPI_SRAT_CPU_ENABLED) ? 88 "enabled" : "disabled"); 89 } 90 break; 91 92 case ACPI_SRAT_TYPE_MEMORY_AFFINITY: 93 { 94 struct acpi_srat_mem_affinity *p = 95 (struct acpi_srat_mem_affinity *)header; 96 pr_debug("SRAT Memory (0x%llx length 0x%llx) in proximity domain %d %s%s%s\n", 97 (unsigned long long)p->base_address, 98 (unsigned long long)p->length, 99 p->proximity_domain, 100 (p->flags & ACPI_SRAT_MEM_ENABLED) ? 101 "enabled" : "disabled", 102 (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ? 103 " hot-pluggable" : "", 104 (p->flags & ACPI_SRAT_MEM_NON_VOLATILE) ? 105 " non-volatile" : ""); 106 } 107 break; 108 109 case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY: 110 { 111 struct acpi_srat_x2apic_cpu_affinity *p = 112 (struct acpi_srat_x2apic_cpu_affinity *)header; 113 pr_debug("SRAT Processor (x2apicid[0x%08x]) in proximity domain %d %s\n", 114 p->apic_id, 115 p->proximity_domain, 116 (p->flags & ACPI_SRAT_CPU_ENABLED) ? 117 "enabled" : "disabled"); 118 } 119 break; 120 121 case ACPI_SRAT_TYPE_GICC_AFFINITY: 122 { 123 struct acpi_srat_gicc_affinity *p = 124 (struct acpi_srat_gicc_affinity *)header; 125 pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n", 126 p->acpi_processor_uid, 127 p->proximity_domain, 128 (p->flags & ACPI_SRAT_GICC_ENABLED) ? 129 "enabled" : "disabled"); 130 } 131 break; 132 133 default: 134 pr_warn("Found unsupported SRAT entry (type = 0x%x)\n", 135 header->type); 136 break; 137 } 138 } 139 140 /* 141 * A lot of BIOS fill in 10 (= no distance) everywhere. This messes 142 * up the NUMA heuristics which wants the local node to have a smaller 143 * distance than the others. 144 * Do some quick checks here and only use the SLIT if it passes. 145 */ 146 static int __init slit_valid(struct acpi_table_slit *slit) 147 { 148 int i, j; 149 int d = slit->locality_count; 150 for (i = 0; i < d; i++) { 151 for (j = 0; j < d; j++) { 152 u8 val = slit->entry[d*i + j]; 153 if (i == j) { 154 if (val != LOCAL_DISTANCE) 155 return 0; 156 } else if (val <= LOCAL_DISTANCE) 157 return 0; 158 } 159 } 160 return 1; 161 } 162 163 void __init bad_srat(void) 164 { 165 pr_err("SRAT: SRAT not used.\n"); 166 acpi_numa = -1; 167 } 168 169 int __init srat_disabled(void) 170 { 171 return acpi_numa < 0; 172 } 173 174 #if defined(CONFIG_X86) || defined(CONFIG_ARM64) 175 /* 176 * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for 177 * I/O localities since SRAT does not list them. I/O localities are 178 * not supported at this point. 179 */ 180 void __init acpi_numa_slit_init(struct acpi_table_slit *slit) 181 { 182 int i, j; 183 184 for (i = 0; i < slit->locality_count; i++) { 185 const int from_node = pxm_to_node(i); 186 187 if (from_node == NUMA_NO_NODE) 188 continue; 189 190 for (j = 0; j < slit->locality_count; j++) { 191 const int to_node = pxm_to_node(j); 192 193 if (to_node == NUMA_NO_NODE) 194 continue; 195 196 numa_set_distance(from_node, to_node, 197 slit->entry[slit->locality_count * i + j]); 198 } 199 } 200 } 201 202 /* 203 * Default callback for parsing of the Proximity Domain <-> Memory 204 * Area mappings 205 */ 206 int __init 207 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma) 208 { 209 u64 start, end; 210 u32 hotpluggable; 211 int node, pxm; 212 213 if (srat_disabled()) 214 goto out_err; 215 if (ma->header.length < sizeof(struct acpi_srat_mem_affinity)) { 216 pr_err("SRAT: Unexpected header length: %d\n", 217 ma->header.length); 218 goto out_err_bad_srat; 219 } 220 if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0) 221 goto out_err; 222 hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE; 223 if (hotpluggable && !IS_ENABLED(CONFIG_MEMORY_HOTPLUG)) 224 goto out_err; 225 226 start = ma->base_address; 227 end = start + ma->length; 228 pxm = ma->proximity_domain; 229 if (acpi_srat_revision <= 1) 230 pxm &= 0xff; 231 232 node = acpi_map_pxm_to_node(pxm); 233 if (node == NUMA_NO_NODE) { 234 pr_err("SRAT: Too many proximity domains.\n"); 235 goto out_err_bad_srat; 236 } 237 238 if (numa_add_memblk(node, start, end) < 0) { 239 pr_err("SRAT: Failed to add memblk to node %u [mem %#010Lx-%#010Lx]\n", 240 node, (unsigned long long) start, 241 (unsigned long long) end - 1); 242 goto out_err_bad_srat; 243 } 244 245 node_set(node, numa_nodes_parsed); 246 247 pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s%s\n", 248 node, pxm, 249 (unsigned long long) start, (unsigned long long) end - 1, 250 hotpluggable ? " hotplug" : "", 251 ma->flags & ACPI_SRAT_MEM_NON_VOLATILE ? " non-volatile" : ""); 252 253 /* Mark hotplug range in memblock. */ 254 if (hotpluggable && memblock_mark_hotplug(start, ma->length)) 255 pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n", 256 (unsigned long long)start, (unsigned long long)end - 1); 257 258 max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1)); 259 260 return 0; 261 out_err_bad_srat: 262 bad_srat(); 263 out_err: 264 return -EINVAL; 265 } 266 #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */ 267 268 static int __init acpi_parse_slit(struct acpi_table_header *table) 269 { 270 struct acpi_table_slit *slit = (struct acpi_table_slit *)table; 271 272 if (!slit_valid(slit)) { 273 pr_info("SLIT table looks invalid. Not used.\n"); 274 return -EINVAL; 275 } 276 acpi_numa_slit_init(slit); 277 278 return 0; 279 } 280 281 void __init __weak 282 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa) 283 { 284 pr_warn("Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id); 285 } 286 287 static int __init 288 acpi_parse_x2apic_affinity(union acpi_subtable_headers *header, 289 const unsigned long end) 290 { 291 struct acpi_srat_x2apic_cpu_affinity *processor_affinity; 292 293 processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header; 294 295 acpi_table_print_srat_entry(&header->common); 296 297 /* let architecture-dependent part to do it */ 298 acpi_numa_x2apic_affinity_init(processor_affinity); 299 300 return 0; 301 } 302 303 static int __init 304 acpi_parse_processor_affinity(union acpi_subtable_headers *header, 305 const unsigned long end) 306 { 307 struct acpi_srat_cpu_affinity *processor_affinity; 308 309 processor_affinity = (struct acpi_srat_cpu_affinity *)header; 310 311 acpi_table_print_srat_entry(&header->common); 312 313 /* let architecture-dependent part to do it */ 314 acpi_numa_processor_affinity_init(processor_affinity); 315 316 return 0; 317 } 318 319 static int __init 320 acpi_parse_gicc_affinity(union acpi_subtable_headers *header, 321 const unsigned long end) 322 { 323 struct acpi_srat_gicc_affinity *processor_affinity; 324 325 processor_affinity = (struct acpi_srat_gicc_affinity *)header; 326 327 acpi_table_print_srat_entry(&header->common); 328 329 /* let architecture-dependent part to do it */ 330 acpi_numa_gicc_affinity_init(processor_affinity); 331 332 return 0; 333 } 334 335 static int __initdata parsed_numa_memblks; 336 337 static int __init 338 acpi_parse_memory_affinity(union acpi_subtable_headers * header, 339 const unsigned long end) 340 { 341 struct acpi_srat_mem_affinity *memory_affinity; 342 343 memory_affinity = (struct acpi_srat_mem_affinity *)header; 344 345 acpi_table_print_srat_entry(&header->common); 346 347 /* let architecture-dependent part to do it */ 348 if (!acpi_numa_memory_affinity_init(memory_affinity)) 349 parsed_numa_memblks++; 350 return 0; 351 } 352 353 static int __init acpi_parse_srat(struct acpi_table_header *table) 354 { 355 struct acpi_table_srat *srat = (struct acpi_table_srat *)table; 356 357 acpi_srat_revision = srat->header.revision; 358 359 /* Real work done in acpi_table_parse_srat below. */ 360 361 return 0; 362 } 363 364 static int __init 365 acpi_table_parse_srat(enum acpi_srat_type id, 366 acpi_tbl_entry_handler handler, unsigned int max_entries) 367 { 368 return acpi_table_parse_entries(ACPI_SIG_SRAT, 369 sizeof(struct acpi_table_srat), id, 370 handler, max_entries); 371 } 372 373 int __init acpi_numa_init(void) 374 { 375 int cnt = 0; 376 377 if (acpi_disabled) 378 return -EINVAL; 379 380 /* 381 * Should not limit number with cpu num that is from NR_CPUS or nr_cpus= 382 * SRAT cpu entries could have different order with that in MADT. 383 * So go over all cpu entries in SRAT to get apicid to node mapping. 384 */ 385 386 /* SRAT: System Resource Affinity Table */ 387 if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) { 388 struct acpi_subtable_proc srat_proc[3]; 389 390 memset(srat_proc, 0, sizeof(srat_proc)); 391 srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY; 392 srat_proc[0].handler = acpi_parse_processor_affinity; 393 srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY; 394 srat_proc[1].handler = acpi_parse_x2apic_affinity; 395 srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY; 396 srat_proc[2].handler = acpi_parse_gicc_affinity; 397 398 acpi_table_parse_entries_array(ACPI_SIG_SRAT, 399 sizeof(struct acpi_table_srat), 400 srat_proc, ARRAY_SIZE(srat_proc), 0); 401 402 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY, 403 acpi_parse_memory_affinity, 0); 404 } 405 406 /* SLIT: System Locality Information Table */ 407 acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit); 408 409 if (cnt < 0) 410 return cnt; 411 else if (!parsed_numa_memblks) 412 return -ENOENT; 413 return 0; 414 } 415 416 static int acpi_get_pxm(acpi_handle h) 417 { 418 unsigned long long pxm; 419 acpi_status status; 420 acpi_handle handle; 421 acpi_handle phandle = h; 422 423 do { 424 handle = phandle; 425 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm); 426 if (ACPI_SUCCESS(status)) 427 return pxm; 428 status = acpi_get_parent(handle, &phandle); 429 } while (ACPI_SUCCESS(status)); 430 return -1; 431 } 432 433 int acpi_get_node(acpi_handle handle) 434 { 435 int pxm; 436 437 pxm = acpi_get_pxm(handle); 438 439 return acpi_map_pxm_to_node(pxm); 440 } 441 EXPORT_SYMBOL(acpi_get_node); 442