Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 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 | |
Hanjun Guo | d8b47fc | 2016-05-24 15:35:44 -0700 | [diff] [blame] | 20 | #include <linux/acpi.h> |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 21 | #include <linux/bootmem.h> |
| 22 | #include <linux/memblock.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/of.h> |
| 25 | |
| 26 | struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; |
| 27 | EXPORT_SYMBOL(node_data); |
| 28 | nodemask_t numa_nodes_parsed __initdata; |
| 29 | static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE }; |
| 30 | |
| 31 | static int numa_distance_cnt; |
| 32 | static u8 *numa_distance; |
David Daney | 34c3337 | 2016-05-24 15:35:37 -0700 | [diff] [blame] | 33 | static bool numa_off; |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 34 | |
| 35 | static __init int numa_parse_early_param(char *opt) |
| 36 | { |
| 37 | if (!opt) |
| 38 | return -EINVAL; |
| 39 | if (!strncmp(opt, "off", 3)) { |
| 40 | pr_info("%s\n", "NUMA turned off"); |
David Daney | 34c3337 | 2016-05-24 15:35:37 -0700 | [diff] [blame] | 41 | numa_off = true; |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 42 | } |
| 43 | return 0; |
| 44 | } |
| 45 | early_param("numa", numa_parse_early_param); |
| 46 | |
| 47 | cpumask_var_t node_to_cpumask_map[MAX_NUMNODES]; |
| 48 | EXPORT_SYMBOL(node_to_cpumask_map); |
| 49 | |
| 50 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS |
| 51 | |
| 52 | /* |
| 53 | * Returns a pointer to the bitmask of CPUs on Node 'node'. |
| 54 | */ |
| 55 | const struct cpumask *cpumask_of_node(int node) |
| 56 | { |
| 57 | if (WARN_ON(node >= nr_node_ids)) |
| 58 | return cpu_none_mask; |
| 59 | |
| 60 | if (WARN_ON(node_to_cpumask_map[node] == NULL)) |
| 61 | return cpu_online_mask; |
| 62 | |
| 63 | return node_to_cpumask_map[node]; |
| 64 | } |
| 65 | EXPORT_SYMBOL(cpumask_of_node); |
| 66 | |
| 67 | #endif |
| 68 | |
| 69 | static void map_cpu_to_node(unsigned int cpu, int nid) |
| 70 | { |
| 71 | set_cpu_numa_node(cpu, nid); |
| 72 | if (nid >= 0) |
| 73 | cpumask_set_cpu(cpu, node_to_cpumask_map[nid]); |
| 74 | } |
| 75 | |
| 76 | void numa_clear_node(unsigned int cpu) |
| 77 | { |
| 78 | int nid = cpu_to_node(cpu); |
| 79 | |
| 80 | if (nid >= 0) |
| 81 | cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]); |
| 82 | set_cpu_numa_node(cpu, NUMA_NO_NODE); |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * Allocate node_to_cpumask_map based on number of available nodes |
| 87 | * Requires node_possible_map to be valid. |
| 88 | * |
| 89 | * Note: cpumask_of_node() is not valid until after this is done. |
| 90 | * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.) |
| 91 | */ |
| 92 | static void __init setup_node_to_cpumask_map(void) |
| 93 | { |
| 94 | unsigned int cpu; |
| 95 | int node; |
| 96 | |
| 97 | /* setup nr_node_ids if not done yet */ |
| 98 | if (nr_node_ids == MAX_NUMNODES) |
| 99 | setup_nr_node_ids(); |
| 100 | |
| 101 | /* allocate and clear the mapping */ |
| 102 | for (node = 0; node < nr_node_ids; node++) { |
| 103 | alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]); |
| 104 | cpumask_clear(node_to_cpumask_map[node]); |
| 105 | } |
| 106 | |
| 107 | for_each_possible_cpu(cpu) |
| 108 | set_cpu_numa_node(cpu, NUMA_NO_NODE); |
| 109 | |
| 110 | /* cpumask_of_node() will now work */ |
| 111 | pr_debug("NUMA: Node to cpumask map for %d nodes\n", nr_node_ids); |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * Set the cpu to node and mem mapping |
| 116 | */ |
| 117 | void numa_store_cpu_info(unsigned int cpu) |
| 118 | { |
| 119 | map_cpu_to_node(cpu, numa_off ? 0 : cpu_to_node_map[cpu]); |
| 120 | } |
| 121 | |
| 122 | void __init early_map_cpu_to_node(unsigned int cpu, int nid) |
| 123 | { |
| 124 | /* fallback to node 0 */ |
| 125 | if (nid < 0 || nid >= MAX_NUMNODES) |
| 126 | nid = 0; |
| 127 | |
| 128 | cpu_to_node_map[cpu] = nid; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * numa_add_memblk - Set node id to memblk |
| 133 | * @nid: NUMA node ID of the new memblk |
| 134 | * @start: Start address of the new memblk |
Hanjun Guo | 8ccbbda | 2016-05-24 15:35:36 -0700 | [diff] [blame] | 135 | * @end: End address of the new memblk |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 136 | * |
| 137 | * RETURNS: |
| 138 | * 0 on success, -errno on failure. |
| 139 | */ |
Hanjun Guo | 8ccbbda | 2016-05-24 15:35:36 -0700 | [diff] [blame] | 140 | int __init numa_add_memblk(int nid, u64 start, u64 end) |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 141 | { |
| 142 | int ret; |
| 143 | |
Hanjun Guo | 8ccbbda | 2016-05-24 15:35:36 -0700 | [diff] [blame] | 144 | ret = memblock_set_node(start, (end - start), &memblock.memory, nid); |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 145 | if (ret < 0) { |
| 146 | pr_err("NUMA: memblock [0x%llx - 0x%llx] failed to add on node %d\n", |
Hanjun Guo | 8ccbbda | 2016-05-24 15:35:36 -0700 | [diff] [blame] | 147 | start, (end - 1), nid); |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 148 | return ret; |
| 149 | } |
| 150 | |
| 151 | node_set(nid, numa_nodes_parsed); |
| 152 | pr_info("NUMA: Adding memblock [0x%llx - 0x%llx] on node %d\n", |
Hanjun Guo | 8ccbbda | 2016-05-24 15:35:36 -0700 | [diff] [blame] | 153 | start, (end - 1), nid); |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 154 | return ret; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Initialize NODE_DATA for a node on the local memory |
| 159 | */ |
| 160 | static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn) |
| 161 | { |
| 162 | const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES); |
| 163 | u64 nd_pa; |
| 164 | void *nd; |
| 165 | int tnid; |
| 166 | |
| 167 | pr_info("NUMA: Initmem setup node %d [mem %#010Lx-%#010Lx]\n", |
| 168 | nid, start_pfn << PAGE_SHIFT, |
| 169 | (end_pfn << PAGE_SHIFT) - 1); |
| 170 | |
| 171 | nd_pa = memblock_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid); |
| 172 | nd = __va(nd_pa); |
| 173 | |
| 174 | /* report and initialize */ |
| 175 | pr_info("NUMA: NODE_DATA [mem %#010Lx-%#010Lx]\n", |
| 176 | nd_pa, nd_pa + nd_size - 1); |
| 177 | tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT); |
| 178 | if (tnid != nid) |
| 179 | pr_info("NUMA: NODE_DATA(%d) on node %d\n", nid, tnid); |
| 180 | |
| 181 | node_data[nid] = nd; |
| 182 | memset(NODE_DATA(nid), 0, sizeof(pg_data_t)); |
| 183 | NODE_DATA(nid)->node_id = nid; |
| 184 | NODE_DATA(nid)->node_start_pfn = start_pfn; |
| 185 | NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * numa_free_distance |
| 190 | * |
| 191 | * The current table is freed. |
| 192 | */ |
| 193 | void __init numa_free_distance(void) |
| 194 | { |
| 195 | size_t size; |
| 196 | |
| 197 | if (!numa_distance) |
| 198 | return; |
| 199 | |
| 200 | size = numa_distance_cnt * numa_distance_cnt * |
| 201 | sizeof(numa_distance[0]); |
| 202 | |
| 203 | memblock_free(__pa(numa_distance), size); |
| 204 | numa_distance_cnt = 0; |
| 205 | numa_distance = NULL; |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * |
| 210 | * Create a new NUMA distance table. |
| 211 | * |
| 212 | */ |
| 213 | static int __init numa_alloc_distance(void) |
| 214 | { |
| 215 | size_t size; |
| 216 | u64 phys; |
| 217 | int i, j; |
| 218 | |
| 219 | size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]); |
| 220 | phys = memblock_find_in_range(0, PFN_PHYS(max_pfn), |
| 221 | size, PAGE_SIZE); |
| 222 | if (WARN_ON(!phys)) |
| 223 | return -ENOMEM; |
| 224 | |
| 225 | memblock_reserve(phys, size); |
| 226 | |
| 227 | numa_distance = __va(phys); |
| 228 | numa_distance_cnt = nr_node_ids; |
| 229 | |
| 230 | /* fill with the default distances */ |
| 231 | for (i = 0; i < numa_distance_cnt; i++) |
| 232 | for (j = 0; j < numa_distance_cnt; j++) |
| 233 | numa_distance[i * numa_distance_cnt + j] = i == j ? |
| 234 | LOCAL_DISTANCE : REMOTE_DISTANCE; |
| 235 | |
| 236 | pr_debug("NUMA: Initialized distance table, cnt=%d\n", |
| 237 | numa_distance_cnt); |
| 238 | |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * numa_set_distance - Set inter node NUMA distance from node to node. |
| 244 | * @from: the 'from' node to set distance |
| 245 | * @to: the 'to' node to set distance |
| 246 | * @distance: NUMA distance |
| 247 | * |
| 248 | * Set the distance from node @from to @to to @distance. |
| 249 | * If distance table doesn't exist, a warning is printed. |
| 250 | * |
| 251 | * If @from or @to is higher than the highest known node or lower than zero |
| 252 | * or @distance doesn't make sense, the call is ignored. |
| 253 | * |
| 254 | */ |
| 255 | void __init numa_set_distance(int from, int to, int distance) |
| 256 | { |
| 257 | if (!numa_distance) { |
| 258 | pr_warn_once("NUMA: Warning: distance table not allocated yet\n"); |
| 259 | return; |
| 260 | } |
| 261 | |
| 262 | if (from >= numa_distance_cnt || to >= numa_distance_cnt || |
| 263 | from < 0 || to < 0) { |
| 264 | pr_warn_once("NUMA: Warning: node ids are out of bound, from=%d to=%d distance=%d\n", |
| 265 | from, to, distance); |
| 266 | return; |
| 267 | } |
| 268 | |
| 269 | if ((u8)distance != distance || |
| 270 | (from == to && distance != LOCAL_DISTANCE)) { |
| 271 | pr_warn_once("NUMA: Warning: invalid distance parameter, from=%d to=%d distance=%d\n", |
| 272 | from, to, distance); |
| 273 | return; |
| 274 | } |
| 275 | |
| 276 | numa_distance[from * numa_distance_cnt + to] = distance; |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * Return NUMA distance @from to @to |
| 281 | */ |
| 282 | int __node_distance(int from, int to) |
| 283 | { |
| 284 | if (from >= numa_distance_cnt || to >= numa_distance_cnt) |
| 285 | return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE; |
| 286 | return numa_distance[from * numa_distance_cnt + to]; |
| 287 | } |
| 288 | EXPORT_SYMBOL(__node_distance); |
| 289 | |
| 290 | static int __init numa_register_nodes(void) |
| 291 | { |
| 292 | int nid; |
| 293 | struct memblock_region *mblk; |
| 294 | |
| 295 | /* Check that valid nid is set to memblks */ |
| 296 | for_each_memblock(memory, mblk) |
| 297 | if (mblk->nid == NUMA_NO_NODE || mblk->nid >= MAX_NUMNODES) { |
| 298 | pr_warn("NUMA: Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n", |
| 299 | mblk->nid, mblk->base, |
| 300 | mblk->base + mblk->size - 1); |
| 301 | return -EINVAL; |
| 302 | } |
| 303 | |
| 304 | /* Finally register nodes. */ |
| 305 | for_each_node_mask(nid, numa_nodes_parsed) { |
| 306 | unsigned long start_pfn, end_pfn; |
| 307 | |
| 308 | get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); |
| 309 | setup_node_data(nid, start_pfn, end_pfn); |
| 310 | node_set_online(nid); |
| 311 | } |
| 312 | |
| 313 | /* Setup online nodes to actual nodes*/ |
| 314 | node_possible_map = numa_nodes_parsed; |
| 315 | |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | static int __init numa_init(int (*init_func)(void)) |
| 320 | { |
| 321 | int ret; |
| 322 | |
| 323 | nodes_clear(numa_nodes_parsed); |
| 324 | nodes_clear(node_possible_map); |
| 325 | nodes_clear(node_online_map); |
| 326 | numa_free_distance(); |
| 327 | |
| 328 | ret = numa_alloc_distance(); |
| 329 | if (ret < 0) |
| 330 | return ret; |
| 331 | |
| 332 | ret = init_func(); |
| 333 | if (ret < 0) |
| 334 | return ret; |
| 335 | |
| 336 | if (nodes_empty(numa_nodes_parsed)) |
| 337 | return -EINVAL; |
| 338 | |
| 339 | ret = numa_register_nodes(); |
| 340 | if (ret < 0) |
| 341 | return ret; |
| 342 | |
| 343 | setup_node_to_cpumask_map(); |
| 344 | |
| 345 | /* init boot processor */ |
| 346 | cpu_to_node_map[0] = 0; |
| 347 | map_cpu_to_node(0, 0); |
| 348 | |
| 349 | return 0; |
| 350 | } |
| 351 | |
| 352 | /** |
| 353 | * dummy_numa_init - Fallback dummy NUMA init |
| 354 | * |
| 355 | * Used if there's no underlying NUMA architecture, NUMA initialization |
| 356 | * fails, or NUMA is disabled on the command line. |
| 357 | * |
| 358 | * Must online at least one node (node 0) and add memory blocks that cover all |
| 359 | * allowed memory. It is unlikely that this function fails. |
| 360 | */ |
| 361 | static int __init dummy_numa_init(void) |
| 362 | { |
| 363 | int ret; |
| 364 | struct memblock_region *mblk; |
| 365 | |
David Daney | 34c3337 | 2016-05-24 15:35:37 -0700 | [diff] [blame] | 366 | if (numa_off) |
| 367 | pr_info("NUMA disabled\n"); /* Forced off on command line. */ |
| 368 | else |
| 369 | pr_info("No NUMA configuration found\n"); |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 370 | pr_info("NUMA: Faking a node at [mem %#018Lx-%#018Lx]\n", |
| 371 | 0LLU, PFN_PHYS(max_pfn) - 1); |
| 372 | |
| 373 | for_each_memblock(memory, mblk) { |
Hanjun Guo | 8ccbbda | 2016-05-24 15:35:36 -0700 | [diff] [blame] | 374 | ret = numa_add_memblk(0, mblk->base, mblk->base + mblk->size); |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 375 | if (!ret) |
| 376 | continue; |
| 377 | |
| 378 | pr_err("NUMA init failed\n"); |
| 379 | return ret; |
| 380 | } |
| 381 | |
David Daney | 34c3337 | 2016-05-24 15:35:37 -0700 | [diff] [blame] | 382 | numa_off = true; |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | /** |
| 387 | * arm64_numa_init - Initialize NUMA |
| 388 | * |
| 389 | * Try each configured NUMA initialization method until one succeeds. The |
| 390 | * last fallback is dummy single node config encomapssing whole memory. |
| 391 | */ |
| 392 | void __init arm64_numa_init(void) |
| 393 | { |
| 394 | if (!numa_off) { |
Hanjun Guo | d8b47fc | 2016-05-24 15:35:44 -0700 | [diff] [blame] | 395 | if (!acpi_disabled && !numa_init(arm64_acpi_numa_init)) |
| 396 | return; |
| 397 | if (acpi_disabled && !numa_init(of_numa_init)) |
Ganapatrao Kulkarni | 1a2db30 | 2016-04-08 15:50:27 -0700 | [diff] [blame] | 398 | return; |
| 399 | } |
| 400 | |
| 401 | numa_init(dummy_numa_init); |
| 402 | } |