arch/arm64/mm/numa.c

   1 /*
   2  * NUMA support, based on the x86 implementation.
   3  *
   4  * Copyright (C) 2015 Cavium Inc.
   5  * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #define pr_fmt(fmt) "NUMA: " fmt
  21
  22 #include <linux/acpi.h>
  23 #include <linux/memblock.h>
  24 #include <linux/module.h>
  25 #include <linux/of.h>
  26
  27 #include <asm/acpi.h>
  28 #include <asm/sections.h>
  29
  30 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  31 EXPORT_SYMBOL(node_data);
  32 nodemask_t numa_nodes_parsed __initdata;
  33 static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
  34
  35 static int numa_distance_cnt;
  36 static u8 *numa_distance;
  37 bool numa_off;
  38
  39 static __init int numa_parse_early_param(char *opt)
  40 {
  41         if (!opt)
  42                 return -EINVAL;
  43         if (!strncmp(opt, "off", 3))
  44                 numa_off = true;
  45
  46         return 0;
  47 }
  48 early_param("numa", numa_parse_early_param);
  49
  50 cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
  51 EXPORT_SYMBOL(node_to_cpumask_map);
  52
  53 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
  54
  55 /*
  56  * Returns a pointer to the bitmask of CPUs on Node 'node'.
  57  */
  58 const struct cpumask *cpumask_of_node(int node)
  59 {
  60         if (WARN_ON(node >= nr_node_ids))
  61                 return cpu_none_mask;
  62
  63         if (WARN_ON(node_to_cpumask_map[node] == NULL))
  64                 return cpu_online_mask;
  65
  66         return node_to_cpumask_map[node];
  67 }
  68 EXPORT_SYMBOL(cpumask_of_node);
  69
  70 #endif
  71
  72 static void numa_update_cpu(unsigned int cpu, bool remove)
  73 {
  74         int nid = cpu_to_node(cpu);
  75
  76         if (nid == NUMA_NO_NODE)
  77                 return;
  78
  79         if (remove)
  80                 cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
  81         else
  82                 cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
  83 }
  84
  85 void numa_add_cpu(unsigned int cpu)
  86 {
  87         numa_update_cpu(cpu, false);
  88 }
  89
  90 void numa_remove_cpu(unsigned int cpu)
  91 {
  92         numa_update_cpu(cpu, true);
  93 }
  94
  95 void numa_clear_node(unsigned int cpu)
  96 {
  97         numa_remove_cpu(cpu);
  98         set_cpu_numa_node(cpu, NUMA_NO_NODE);
  99 }
 100
 101 /*
 102  * Allocate node_to_cpumask_map based on number of available nodes
 103  * Requires node_possible_map to be valid.
 104  *
 105  * Note: cpumask_of_node() is not valid until after this is done.
 106  * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
 107  */
 108 static void __init setup_node_to_cpumask_map(void)
 109 {
 110         int node;
 111
 112         /* setup nr_node_ids if not done yet */
 113         if (nr_node_ids == MAX_NUMNODES)
 114                 setup_nr_node_ids();
 115
 116         /* allocate and clear the mapping */
 117         for (node = 0; node < nr_node_ids; node++) {
 118                 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
 119                 cpumask_clear(node_to_cpumask_map[node]);
 120         }
 121
 122         /* cpumask_of_node() will now work */
 123         pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
 124 }
 125
 126 /*
 127  * Set the cpu to node and mem mapping
 128  */
 129 void numa_store_cpu_info(unsigned int cpu)
 130 {
 131         set_cpu_numa_node(cpu, cpu_to_node_map[cpu]);
 132 }
 133
 134 void __init early_map_cpu_to_node(unsigned int cpu, int nid)
 135 {
 136         /* fallback to node 0 */
 137         if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
 138                 nid = 0;
 139
 140         cpu_to_node_map[cpu] = nid;
 141
 142         /*
 143          * We should set the numa node of cpu0 as soon as possible, because it
 144          * has already been set up online before. cpu_to_node(0) will soon be
 145          * called.
 146          */
 147         if (!cpu)
 148                 set_cpu_numa_node(cpu, nid);
 149 }
 150
 151 #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
 152 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
 153 EXPORT_SYMBOL(__per_cpu_offset);
 154
 155 static int __init early_cpu_to_node(int cpu)
 156 {
 157         return cpu_to_node_map[cpu];
 158 }
 159
 160 static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
 161 {
 162         return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
 163 }
 164
 165 static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size,
 166                                        size_t align)
 167 {
 168         int nid = early_cpu_to_node(cpu);
 169
 170         return  memblock_alloc_try_nid(size, align,
 171                         __pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid);
 172 }
 173
 174 static void __init pcpu_fc_free(void *ptr, size_t size)
 175 {
 176         memblock_free_early(__pa(ptr), size);
 177 }
 178
 179 void __init setup_per_cpu_areas(void)
 180 {
 181         unsigned long delta;
 182         unsigned int cpu;
 183         int rc;
 184
 185         /*
 186          * Always reserve area for module percpu variables.  That's
 187          * what the legacy allocator did.
 188          */
 189         rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
 190                                     PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
 191                                     pcpu_cpu_distance,
 192                                     pcpu_fc_alloc, pcpu_fc_free);
 193         if (rc < 0)
 194                 panic("Failed to initialize percpu areas.");
 195
 196         delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
 197         for_each_possible_cpu(cpu)
 198                 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
 199 }
 200 #endif
 201
 202 /**
 203  * numa_add_memblk() - Set node id to memblk
 204  * @nid: NUMA node ID of the new memblk
 205  * @start: Start address of the new memblk
 206  * @end:  End address of the new memblk
 207  *
 208  * RETURNS:
 209  * 0 on success, -errno on failure.
 210  */
 211 int __init numa_add_memblk(int nid, u64 start, u64 end)
 212 {
 213         int ret;
 214
 215         ret = memblock_set_node(start, (end - start), &memblock.memory, nid);
 216         if (ret < 0) {
 217                 pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n",
 218                         start, (end - 1), nid);
 219                 return ret;
 220         }
 221
 222         node_set(nid, numa_nodes_parsed);
 223         return ret;
 224 }
 225
 226 /*
 227  * Initialize NODE_DATA for a node on the local memory
 228  */
 229 static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
 230 {
 231         const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
 232         u64 nd_pa;
 233         void *nd;
 234         int tnid;
 235
 236         if (start_pfn >= end_pfn)
 237                 pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
 238
 239         nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
 240         if (!nd_pa)
 241                 panic("Cannot allocate %zu bytes for node %d data\n",
 242                       nd_size, nid);
 243
 244         nd = __va(nd_pa);
 245
 246         /* report and initialize */
 247         pr_info("NODE_DATA [mem %#010Lx-%#010Lx]\n",
 248                 nd_pa, nd_pa + nd_size - 1);
 249         tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
 250         if (tnid != nid)
 251                 pr_info("NODE_DATA(%d) on node %d\n", nid, tnid);
 252
 253         node_data[nid] = nd;
 254         memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
 255         NODE_DATA(nid)->node_id = nid;
 256         NODE_DATA(nid)->node_start_pfn = start_pfn;
 257         NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
 258 }
 259
 260 /*
 261  * numa_free_distance
 262  *
 263  * The current table is freed.
 264  */
 265 void __init numa_free_distance(void)
 266 {
 267         size_t size;
 268
 269         if (!numa_distance)
 270                 return;
 271
 272         size = numa_distance_cnt * numa_distance_cnt *
 273                 sizeof(numa_distance[0]);
 274
 275         memblock_free(__pa(numa_distance), size);
 276         numa_distance_cnt = 0;
 277         numa_distance = NULL;
 278 }
 279
 280 /*
 281  * Create a new NUMA distance table.
 282  */
 283 static int __init numa_alloc_distance(void)
 284 {
 285         size_t size;
 286         u64 phys;
 287         int i, j;
 288
 289         size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
 290         phys = memblock_find_in_range(0, PFN_PHYS(max_pfn),
 291                                       size, PAGE_SIZE);
 292         if (WARN_ON(!phys))
 293                 return -ENOMEM;
 294
 295         memblock_reserve(phys, size);
 296
 297         numa_distance = __va(phys);
 298         numa_distance_cnt = nr_node_ids;
 299
 300         /* fill with the default distances */
 301         for (i = 0; i < numa_distance_cnt; i++)
 302                 for (j = 0; j < numa_distance_cnt; j++)
 303                         numa_distance[i * numa_distance_cnt + j] = i == j ?
 304                                 LOCAL_DISTANCE : REMOTE_DISTANCE;
 305
 306         pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt);
 307
 308         return 0;
 309 }
 310
 311 /**
 312  * numa_set_distance() - Set inter node NUMA distance from node to node.
 313  * @from: the 'from' node to set distance
 314  * @to: the 'to'  node to set distance
 315  * @distance: NUMA distance
 316  *
 317  * Set the distance from node @from to @to to @distance.
 318  * If distance table doesn't exist, a warning is printed.
 319  *
 320  * If @from or @to is higher than the highest known node or lower than zero
 321  * or @distance doesn't make sense, the call is ignored.
 322  */
 323 void __init numa_set_distance(int from, int to, int distance)
 324 {
 325         if (!numa_distance) {
 326                 pr_warn_once("Warning: distance table not allocated yet\n");
 327                 return;
 328         }
 329
 330         if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
 331                         from < 0 || to < 0) {
 332                 pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
 333                             from, to, distance);
 334                 return;
 335         }
 336
 337         if ((u8)distance != distance ||
 338             (from == to && distance != LOCAL_DISTANCE)) {
 339                 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
 340                              from, to, distance);
 341                 return;
 342         }
 343
 344         numa_distance[from * numa_distance_cnt + to] = distance;
 345 }
 346
 347 /*
 348  * Return NUMA distance @from to @to
 349  */
 350 int __node_distance(int from, int to)
 351 {
 352         if (from >= numa_distance_cnt || to >= numa_distance_cnt)
 353                 return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
 354         return numa_distance[from * numa_distance_cnt + to];
 355 }
 356 EXPORT_SYMBOL(__node_distance);
 357
 358 static int __init numa_register_nodes(void)
 359 {
 360         int nid;
 361         struct memblock_region *mblk;
 362
 363         /* Check that valid nid is set to memblks */
 364         for_each_memblock(memory, mblk)
 365                 if (mblk->nid == NUMA_NO_NODE || mblk->nid >= MAX_NUMNODES) {
 366                         pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
 367                                 mblk->nid, mblk->base,
 368                                 mblk->base + mblk->size - 1);
 369                         return -EINVAL;
 370                 }
 371
 372         /* Finally register nodes. */
 373         for_each_node_mask(nid, numa_nodes_parsed) {
 374                 unsigned long start_pfn, end_pfn;
 375
 376                 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
 377                 setup_node_data(nid, start_pfn, end_pfn);
 378                 node_set_online(nid);
 379         }
 380
 381         /* Setup online nodes to actual nodes*/
 382         node_possible_map = numa_nodes_parsed;
 383
 384         return 0;
 385 }
 386
 387 static int __init numa_init(int (*init_func)(void))
 388 {
 389         int ret;
 390
 391         nodes_clear(numa_nodes_parsed);
 392         nodes_clear(node_possible_map);
 393         nodes_clear(node_online_map);
 394
 395         ret = numa_alloc_distance();
 396         if (ret < 0)
 397                 return ret;
 398
 399         ret = init_func();
 400         if (ret < 0)
 401                 goto out_free_distance;
 402
 403         if (nodes_empty(numa_nodes_parsed)) {
 404                 pr_info("No NUMA configuration found\n");
 405                 ret = -EINVAL;
 406                 goto out_free_distance;
 407         }
 408
 409         ret = numa_register_nodes();
 410         if (ret < 0)
 411                 goto out_free_distance;
 412
 413         setup_node_to_cpumask_map();
 414
 415         return 0;
 416 out_free_distance:
 417         numa_free_distance();
 418         return ret;
 419 }
 420
 421 /**
 422  * dummy_numa_init() - Fallback dummy NUMA init
 423  *
 424  * Used if there's no underlying NUMA architecture, NUMA initialization
 425  * fails, or NUMA is disabled on the command line.
 426  *
 427  * Must online at least one node (node 0) and add memory blocks that cover all
 428  * allowed memory. It is unlikely that this function fails.
 429  *
 430  * Return: 0 on success, -errno on failure.
 431  */
 432 static int __init dummy_numa_init(void)
 433 {
 434         int ret;
 435         struct memblock_region *mblk;
 436
 437         if (numa_off)
 438                 pr_info("NUMA disabled\n"); /* Forced off on command line. */
 439         pr_info("Faking a node at [mem %#018Lx-%#018Lx]\n",
 440                 memblock_start_of_DRAM(), memblock_end_of_DRAM() - 1);
 441
 442         for_each_memblock(memory, mblk) {
 443                 ret = numa_add_memblk(0, mblk->base, mblk->base + mblk->size);
 444                 if (!ret)
 445                         continue;
 446
 447                 pr_err("NUMA init failed\n");
 448                 return ret;
 449         }
 450
 451         numa_off = true;
 452         return 0;
 453 }
 454
 455 /**
 456  * arm64_numa_init() - Initialize NUMA
 457  *
 458  * Try each configured NUMA initialization method until one succeeds. The
 459  * last fallback is dummy single node config encomapssing whole memory.
 460  */
 461 void __init arm64_numa_init(void)
 462 {
 463         if (!numa_off) {
 464                 if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))
 465                         return;
 466                 if (acpi_disabled && !numa_init(of_numa_init))
 467                         return;
 468         }
 469
 470         numa_init(dummy_numa_init);
 471 }
 472
 473 /*
 474  * We hope that we will be hotplugging memory on nodes we already know about,
 475  * such that acpi_get_node() succeeds and we never fall back to this...
 476  */
 477 int memory_add_physaddr_to_nid(u64 addr)
 478 {
 479         pr_warn("Unknown node for memory at 0x%llx, assuming node 0\n", addr);
 480         return 0;
 481 }