root/arch/arm64/mm/numa.c

DEFINITIONS

1. numa_parse_early_param
2. cpumask_of_node
3. numa_update_cpu
4. numa_add_cpu
5. numa_remove_cpu
6. numa_clear_node
7. setup_node_to_cpumask_map
8. numa_store_cpu_info
9. early_map_cpu_to_node
10. early_cpu_to_node
11. pcpu_cpu_distance
12. pcpu_fc_alloc
13. pcpu_fc_free
14. setup_per_cpu_areas
15. numa_add_memblk
16. setup_node_data
17. numa_free_distance
18. numa_alloc_distance
19. numa_set_distance
20. __node_distance
21. numa_register_nodes
22. numa_init
23. dummy_numa_init
24. arm64_numa_init
25. memory_add_physaddr_to_nid

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * NUMA support, based on the x86 implementation.
   4  *
   5  * Copyright (C) 2015 Cavium Inc.
   6  * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
   7  */
   8 
   9 #define pr_fmt(fmt) "NUMA: " fmt
  10 
  11 #include <linux/acpi.h>
  12 #include <linux/memblock.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 
  16 #include <asm/acpi.h>
  17 #include <asm/sections.h>
  18 
  19 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  20 EXPORT_SYMBOL(node_data);
  21 nodemask_t numa_nodes_parsed __initdata;
  22 static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
  23 
  24 static int numa_distance_cnt;
  25 static u8 *numa_distance;
  26 bool numa_off;
  27 
  28 static __init int numa_parse_early_param(char *opt)
  29 {
  30         if (!opt)
  31                 return -EINVAL;
  32         if (str_has_prefix(opt, "off"))
  33                 numa_off = true;
  34 
  35         return 0;
  36 }
  37 early_param("numa", numa_parse_early_param);
  38 
  39 cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
  40 EXPORT_SYMBOL(node_to_cpumask_map);
  41 
  42 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
  43 
  44 /*
  45  * Returns a pointer to the bitmask of CPUs on Node 'node'.
  46  */
  47 const struct cpumask *cpumask_of_node(int node)
  48 {
  49         if (WARN_ON(node >= nr_node_ids))
  50                 return cpu_none_mask;
  51 
  52         if (WARN_ON(node_to_cpumask_map[node] == NULL))
  53                 return cpu_online_mask;
  54 
  55         return node_to_cpumask_map[node];
  56 }
  57 EXPORT_SYMBOL(cpumask_of_node);
  58 
  59 #endif
  60 
  61 static void numa_update_cpu(unsigned int cpu, bool remove)
  62 {
  63         int nid = cpu_to_node(cpu);
  64 
  65         if (nid == NUMA_NO_NODE)
  66                 return;
  67 
  68         if (remove)
  69                 cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
  70         else
  71                 cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
  72 }
  73 
  74 void numa_add_cpu(unsigned int cpu)
  75 {
  76         numa_update_cpu(cpu, false);
  77 }
  78 
  79 void numa_remove_cpu(unsigned int cpu)
  80 {
  81         numa_update_cpu(cpu, true);
  82 }
  83 
  84 void numa_clear_node(unsigned int cpu)
  85 {
  86         numa_remove_cpu(cpu);
  87         set_cpu_numa_node(cpu, NUMA_NO_NODE);
  88 }
  89 
  90 /*
  91  * Allocate node_to_cpumask_map based on number of available nodes
  92  * Requires node_possible_map to be valid.
  93  *
  94  * Note: cpumask_of_node() is not valid until after this is done.
  95  * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
  96  */
  97 static void __init setup_node_to_cpumask_map(void)
  98 {
  99         int node;
 100 
 101         /* setup nr_node_ids if not done yet */
 102         if (nr_node_ids == MAX_NUMNODES)
 103                 setup_nr_node_ids();
 104 
 105         /* allocate and clear the mapping */
 106         for (node = 0; node < nr_node_ids; node++) {
 107                 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
 108                 cpumask_clear(node_to_cpumask_map[node]);
 109         }
 110 
 111         /* cpumask_of_node() will now work */
 112         pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
 113 }
 114 
 115 /*
 116  * Set the cpu to node and mem mapping
 117  */
 118 void numa_store_cpu_info(unsigned int cpu)
 119 {
 120         set_cpu_numa_node(cpu, cpu_to_node_map[cpu]);
 121 }
 122 
 123 void __init early_map_cpu_to_node(unsigned int cpu, int nid)
 124 {
 125         /* fallback to node 0 */
 126         if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
 127                 nid = 0;
 128 
 129         cpu_to_node_map[cpu] = nid;
 130 
 131         /*
 132          * We should set the numa node of cpu0 as soon as possible, because it
 133          * has already been set up online before. cpu_to_node(0) will soon be
 134          * called.
 135          */
 136         if (!cpu)
 137                 set_cpu_numa_node(cpu, nid);
 138 }
 139 
 140 #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
 141 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
 142 EXPORT_SYMBOL(__per_cpu_offset);
 143 
 144 static int __init early_cpu_to_node(int cpu)
 145 {
 146         return cpu_to_node_map[cpu];
 147 }
 148 
 149 static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
 150 {
 151         return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
 152 }
 153 
 154 static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size,
 155                                        size_t align)
 156 {
 157         int nid = early_cpu_to_node(cpu);
 158 
 159         return  memblock_alloc_try_nid(size, align,
 160                         __pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid);
 161 }
 162 
 163 static void __init pcpu_fc_free(void *ptr, size_t size)
 164 {
 165         memblock_free_early(__pa(ptr), size);
 166 }
 167 
 168 void __init setup_per_cpu_areas(void)
 169 {
 170         unsigned long delta;
 171         unsigned int cpu;
 172         int rc;
 173 
 174         /*
 175          * Always reserve area for module percpu variables.  That's
 176          * what the legacy allocator did.
 177          */
 178         rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
 179                                     PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
 180                                     pcpu_cpu_distance,
 181                                     pcpu_fc_alloc, pcpu_fc_free);
 182         if (rc < 0)
 183                 panic("Failed to initialize percpu areas.");
 184 
 185         delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
 186         for_each_possible_cpu(cpu)
 187                 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
 188 }
 189 #endif
 190 
 191 /**
 192  * numa_add_memblk() - Set node id to memblk
 193  * @nid: NUMA node ID of the new memblk
 194  * @start: Start address of the new memblk
 195  * @end:  End address of the new memblk
 196  *
 197  * RETURNS:
 198  * 0 on success, -errno on failure.
 199  */
 200 int __init numa_add_memblk(int nid, u64 start, u64 end)
 201 {
 202         int ret;
 203 
 204         ret = memblock_set_node(start, (end - start), &memblock.memory, nid);
 205         if (ret < 0) {
 206                 pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n",
 207                         start, (end - 1), nid);
 208                 return ret;
 209         }
 210 
 211         node_set(nid, numa_nodes_parsed);
 212         return ret;
 213 }
 214 
 215 /*
 216  * Initialize NODE_DATA for a node on the local memory
 217  */
 218 static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
 219 {
 220         const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
 221         u64 nd_pa;
 222         void *nd;
 223         int tnid;
 224 
 225         if (start_pfn >= end_pfn)
 226                 pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
 227 
 228         nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
 229         if (!nd_pa)
 230                 panic("Cannot allocate %zu bytes for node %d data\n",
 231                       nd_size, nid);
 232 
 233         nd = __va(nd_pa);
 234 
 235         /* report and initialize */
 236         pr_info("NODE_DATA [mem %#010Lx-%#010Lx]\n",
 237                 nd_pa, nd_pa + nd_size - 1);
 238         tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
 239         if (tnid != nid)
 240                 pr_info("NODE_DATA(%d) on node %d\n", nid, tnid);
 241 
 242         node_data[nid] = nd;
 243         memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
 244         NODE_DATA(nid)->node_id = nid;
 245         NODE_DATA(nid)->node_start_pfn = start_pfn;
 246         NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
 247 }
 248 
 249 /*
 250  * numa_free_distance
 251  *
 252  * The current table is freed.
 253  */
 254 void __init numa_free_distance(void)
 255 {
 256         size_t size;
 257 
 258         if (!numa_distance)
 259                 return;
 260 
 261         size = numa_distance_cnt * numa_distance_cnt *
 262                 sizeof(numa_distance[0]);
 263 
 264         memblock_free(__pa(numa_distance), size);
 265         numa_distance_cnt = 0;
 266         numa_distance = NULL;
 267 }
 268 
 269 /*
 270  * Create a new NUMA distance table.
 271  */
 272 static int __init numa_alloc_distance(void)
 273 {
 274         size_t size;
 275         u64 phys;
 276         int i, j;
 277 
 278         size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
 279         phys = memblock_find_in_range(0, PFN_PHYS(max_pfn),
 280                                       size, PAGE_SIZE);
 281         if (WARN_ON(!phys))
 282                 return -ENOMEM;
 283 
 284         memblock_reserve(phys, size);
 285 
 286         numa_distance = __va(phys);
 287         numa_distance_cnt = nr_node_ids;
 288 
 289         /* fill with the default distances */
 290         for (i = 0; i < numa_distance_cnt; i++)
 291                 for (j = 0; j < numa_distance_cnt; j++)
 292                         numa_distance[i * numa_distance_cnt + j] = i == j ?
 293                                 LOCAL_DISTANCE : REMOTE_DISTANCE;
 294 
 295         pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt);
 296 
 297         return 0;
 298 }
 299 
 300 /**
 301  * numa_set_distance() - Set inter node NUMA distance from node to node.
 302  * @from: the 'from' node to set distance
 303  * @to: the 'to'  node to set distance
 304  * @distance: NUMA distance
 305  *
 306  * Set the distance from node @from to @to to @distance.
 307  * If distance table doesn't exist, a warning is printed.
 308  *
 309  * If @from or @to is higher than the highest known node or lower than zero
 310  * or @distance doesn't make sense, the call is ignored.
 311  */
 312 void __init numa_set_distance(int from, int to, int distance)
 313 {
 314         if (!numa_distance) {
 315                 pr_warn_once("Warning: distance table not allocated yet\n");
 316                 return;
 317         }
 318 
 319         if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
 320                         from < 0 || to < 0) {
 321                 pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
 322                             from, to, distance);
 323                 return;
 324         }
 325 
 326         if ((u8)distance != distance ||
 327             (from == to && distance != LOCAL_DISTANCE)) {
 328                 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
 329                              from, to, distance);
 330                 return;
 331         }
 332 
 333         numa_distance[from * numa_distance_cnt + to] = distance;
 334 }
 335 
 336 /*
 337  * Return NUMA distance @from to @to
 338  */
 339 int __node_distance(int from, int to)
 340 {
 341         if (from >= numa_distance_cnt || to >= numa_distance_cnt)
 342                 return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
 343         return numa_distance[from * numa_distance_cnt + to];
 344 }
 345 EXPORT_SYMBOL(__node_distance);
 346 
 347 static int __init numa_register_nodes(void)
 348 {
 349         int nid;
 350         struct memblock_region *mblk;
 351 
 352         /* Check that valid nid is set to memblks */
 353         for_each_memblock(memory, mblk)
 354                 if (mblk->nid == NUMA_NO_NODE || mblk->nid >= MAX_NUMNODES) {
 355                         pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
 356                                 mblk->nid, mblk->base,
 357                                 mblk->base + mblk->size - 1);
 358                         return -EINVAL;
 359                 }
 360 
 361         /* Finally register nodes. */
 362         for_each_node_mask(nid, numa_nodes_parsed) {
 363                 unsigned long start_pfn, end_pfn;
 364 
 365                 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
 366                 setup_node_data(nid, start_pfn, end_pfn);
 367                 node_set_online(nid);
 368         }
 369 
 370         /* Setup online nodes to actual nodes*/
 371         node_possible_map = numa_nodes_parsed;
 372 
 373         return 0;
 374 }
 375 
 376 static int __init numa_init(int (*init_func)(void))
 377 {
 378         int ret;
 379 
 380         nodes_clear(numa_nodes_parsed);
 381         nodes_clear(node_possible_map);
 382         nodes_clear(node_online_map);
 383 
 384         ret = numa_alloc_distance();
 385         if (ret < 0)
 386                 return ret;
 387 
 388         ret = init_func();
 389         if (ret < 0)
 390                 goto out_free_distance;
 391 
 392         if (nodes_empty(numa_nodes_parsed)) {
 393                 pr_info("No NUMA configuration found\n");
 394                 ret = -EINVAL;
 395                 goto out_free_distance;
 396         }
 397 
 398         ret = numa_register_nodes();
 399         if (ret < 0)
 400                 goto out_free_distance;
 401 
 402         setup_node_to_cpumask_map();
 403 
 404         return 0;
 405 out_free_distance:
 406         numa_free_distance();
 407         return ret;
 408 }
 409 
 410 /**
 411  * dummy_numa_init() - Fallback dummy NUMA init
 412  *
 413  * Used if there's no underlying NUMA architecture, NUMA initialization
 414  * fails, or NUMA is disabled on the command line.
 415  *
 416  * Must online at least one node (node 0) and add memory blocks that cover all
 417  * allowed memory. It is unlikely that this function fails.
 418  *
 419  * Return: 0 on success, -errno on failure.
 420  */
 421 static int __init dummy_numa_init(void)
 422 {
 423         int ret;
 424         struct memblock_region *mblk;
 425 
 426         if (numa_off)
 427                 pr_info("NUMA disabled\n"); /* Forced off on command line. */
 428         pr_info("Faking a node at [mem %#018Lx-%#018Lx]\n",
 429                 memblock_start_of_DRAM(), memblock_end_of_DRAM() - 1);
 430 
 431         for_each_memblock(memory, mblk) {
 432                 ret = numa_add_memblk(0, mblk->base, mblk->base + mblk->size);
 433                 if (!ret)
 434                         continue;
 435 
 436                 pr_err("NUMA init failed\n");
 437                 return ret;
 438         }
 439 
 440         numa_off = true;
 441         return 0;
 442 }
 443 
 444 /**
 445  * arm64_numa_init() - Initialize NUMA
 446  *
 447  * Try each configured NUMA initialization method until one succeeds. The
 448  * last fallback is dummy single node config encomapssing whole memory.
 449  */
 450 void __init arm64_numa_init(void)
 451 {
 452         if (!numa_off) {
 453                 if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))
 454                         return;
 455                 if (acpi_disabled && !numa_init(of_numa_init))
 456                         return;
 457         }
 458 
 459         numa_init(dummy_numa_init);
 460 }
 461 
 462 /*
 463  * We hope that we will be hotplugging memory on nodes we already know about,
 464  * such that acpi_get_node() succeeds and we never fall back to this...
 465  */
 466 int memory_add_physaddr_to_nid(u64 addr)
 467 {
 468         pr_warn("Unknown node for memory at 0x%llx, assuming node 0\n", addr);
 469         return 0;
 470 }