1 // SPDX-License-Identifier: GPL-2.0-only
3 * NUMA support, based on the x86 implementation.
5 * Copyright (C) 2015 Cavium Inc.
6 * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
9 #define pr_fmt(fmt) "NUMA: " fmt
11 #include <linux/acpi.h>
12 #include <linux/memblock.h>
13 #include <linux/module.h>
16 #include <asm/sections.h>
18 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
19 EXPORT_SYMBOL(node_data);
20 nodemask_t numa_nodes_parsed __initdata;
21 static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
23 static int numa_distance_cnt;
24 static u8 *numa_distance;
27 static __init int numa_parse_early_param(char *opt)
31 if (str_has_prefix(opt, "off"))
36 early_param("numa", numa_parse_early_param);
38 cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
39 EXPORT_SYMBOL(node_to_cpumask_map);
41 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
44 * Returns a pointer to the bitmask of CPUs on Node 'node'.
46 const struct cpumask *cpumask_of_node(int node)
49 if (node == NUMA_NO_NODE)
52 if (WARN_ON(node < 0 || node >= nr_node_ids))
55 if (WARN_ON(node_to_cpumask_map[node] == NULL))
56 return cpu_online_mask;
58 return node_to_cpumask_map[node];
60 EXPORT_SYMBOL(cpumask_of_node);
64 static void numa_update_cpu(unsigned int cpu, bool remove)
66 int nid = cpu_to_node(cpu);
68 if (nid == NUMA_NO_NODE)
72 cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
74 cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
77 void numa_add_cpu(unsigned int cpu)
79 numa_update_cpu(cpu, false);
82 void numa_remove_cpu(unsigned int cpu)
84 numa_update_cpu(cpu, true);
87 void numa_clear_node(unsigned int cpu)
90 set_cpu_numa_node(cpu, NUMA_NO_NODE);
94 * Allocate node_to_cpumask_map based on number of available nodes
95 * Requires node_possible_map to be valid.
97 * Note: cpumask_of_node() is not valid until after this is done.
98 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
100 static void __init setup_node_to_cpumask_map(void)
104 /* setup nr_node_ids if not done yet */
105 if (nr_node_ids == MAX_NUMNODES)
108 /* allocate and clear the mapping */
109 for (node = 0; node < nr_node_ids; node++) {
110 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
111 cpumask_clear(node_to_cpumask_map[node]);
114 /* cpumask_of_node() will now work */
115 pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
119 * Set the cpu to node and mem mapping
121 void numa_store_cpu_info(unsigned int cpu)
123 set_cpu_numa_node(cpu, cpu_to_node_map[cpu]);
126 void __init early_map_cpu_to_node(unsigned int cpu, int nid)
128 /* fallback to node 0 */
129 if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
132 cpu_to_node_map[cpu] = nid;
135 * We should set the numa node of cpu0 as soon as possible, because it
136 * has already been set up online before. cpu_to_node(0) will soon be
140 set_cpu_numa_node(cpu, nid);
143 #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
144 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
145 EXPORT_SYMBOL(__per_cpu_offset);
147 static int __init early_cpu_to_node(int cpu)
149 return cpu_to_node_map[cpu];
152 static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
154 return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
157 void __init setup_per_cpu_areas(void)
163 if (pcpu_chosen_fc != PCPU_FC_PAGE) {
165 * Always reserve area for module percpu variables. That's
166 * what the legacy allocator did.
168 rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
169 PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
172 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
174 pr_warn("PERCPU: %s allocator failed (%d), falling back to page size\n",
175 pcpu_fc_names[pcpu_chosen_fc], rc);
179 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
181 rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, early_cpu_to_node);
184 panic("Failed to initialize percpu areas (err=%d).", rc);
186 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
187 for_each_possible_cpu(cpu)
188 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
193 * numa_add_memblk() - Set node id to memblk
194 * @nid: NUMA node ID of the new memblk
195 * @start: Start address of the new memblk
196 * @end: End address of the new memblk
199 * 0 on success, -errno on failure.
201 int __init numa_add_memblk(int nid, u64 start, u64 end)
205 ret = memblock_set_node(start, (end - start), &memblock.memory, nid);
207 pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n",
208 start, (end - 1), nid);
212 node_set(nid, numa_nodes_parsed);
217 * Initialize NODE_DATA for a node on the local memory
219 static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
221 const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
226 if (start_pfn >= end_pfn)
227 pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
229 nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
231 panic("Cannot allocate %zu bytes for node %d data\n",
236 /* report and initialize */
237 pr_info("NODE_DATA [mem %#010Lx-%#010Lx]\n",
238 nd_pa, nd_pa + nd_size - 1);
239 tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
241 pr_info("NODE_DATA(%d) on node %d\n", nid, tnid);
244 memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
245 NODE_DATA(nid)->node_id = nid;
246 NODE_DATA(nid)->node_start_pfn = start_pfn;
247 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
253 * The current table is freed.
255 void __init numa_free_distance(void)
262 size = numa_distance_cnt * numa_distance_cnt *
263 sizeof(numa_distance[0]);
265 memblock_free(numa_distance, size);
266 numa_distance_cnt = 0;
267 numa_distance = NULL;
271 * Create a new NUMA distance table.
273 static int __init numa_alloc_distance(void)
278 size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
279 numa_distance = memblock_alloc(size, PAGE_SIZE);
280 if (WARN_ON(!numa_distance))
283 numa_distance_cnt = nr_node_ids;
285 /* fill with the default distances */
286 for (i = 0; i < numa_distance_cnt; i++)
287 for (j = 0; j < numa_distance_cnt; j++)
288 numa_distance[i * numa_distance_cnt + j] = i == j ?
289 LOCAL_DISTANCE : REMOTE_DISTANCE;
291 pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt);
297 * numa_set_distance() - Set inter node NUMA distance from node to node.
298 * @from: the 'from' node to set distance
299 * @to: the 'to' node to set distance
300 * @distance: NUMA distance
302 * Set the distance from node @from to @to to @distance.
303 * If distance table doesn't exist, a warning is printed.
305 * If @from or @to is higher than the highest known node or lower than zero
306 * or @distance doesn't make sense, the call is ignored.
308 void __init numa_set_distance(int from, int to, int distance)
310 if (!numa_distance) {
311 pr_warn_once("Warning: distance table not allocated yet\n");
315 if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
316 from < 0 || to < 0) {
317 pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
322 if ((u8)distance != distance ||
323 (from == to && distance != LOCAL_DISTANCE)) {
324 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
329 numa_distance[from * numa_distance_cnt + to] = distance;
333 * Return NUMA distance @from to @to
335 int __node_distance(int from, int to)
337 if (from >= numa_distance_cnt || to >= numa_distance_cnt)
338 return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
339 return numa_distance[from * numa_distance_cnt + to];
341 EXPORT_SYMBOL(__node_distance);
343 static int __init numa_register_nodes(void)
346 struct memblock_region *mblk;
348 /* Check that valid nid is set to memblks */
349 for_each_mem_region(mblk) {
350 int mblk_nid = memblock_get_region_node(mblk);
351 phys_addr_t start = mblk->base;
352 phys_addr_t end = mblk->base + mblk->size - 1;
354 if (mblk_nid == NUMA_NO_NODE || mblk_nid >= MAX_NUMNODES) {
355 pr_warn("Warning: invalid memblk node %d [mem %pap-%pap]\n",
356 mblk_nid, &start, &end);
361 /* Finally register nodes. */
362 for_each_node_mask(nid, numa_nodes_parsed) {
363 unsigned long start_pfn, end_pfn;
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);
370 /* Setup online nodes to actual nodes*/
371 node_possible_map = numa_nodes_parsed;
376 static int __init numa_init(int (*init_func)(void))
380 nodes_clear(numa_nodes_parsed);
381 nodes_clear(node_possible_map);
382 nodes_clear(node_online_map);
384 ret = numa_alloc_distance();
390 goto out_free_distance;
392 if (nodes_empty(numa_nodes_parsed)) {
393 pr_info("No NUMA configuration found\n");
395 goto out_free_distance;
398 ret = numa_register_nodes();
400 goto out_free_distance;
402 setup_node_to_cpumask_map();
406 numa_free_distance();
411 * dummy_numa_init() - Fallback dummy NUMA init
413 * Used if there's no underlying NUMA architecture, NUMA initialization
414 * fails, or NUMA is disabled on the command line.
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.
419 * Return: 0 on success, -errno on failure.
421 static int __init dummy_numa_init(void)
423 phys_addr_t start = memblock_start_of_DRAM();
424 phys_addr_t end = memblock_end_of_DRAM() - 1;
428 pr_info("NUMA disabled\n"); /* Forced off on command line. */
429 pr_info("Faking a node at [mem %pap-%pap]\n", &start, &end);
431 ret = numa_add_memblk(0, start, end + 1);
433 pr_err("NUMA init failed\n");
441 #ifdef CONFIG_ACPI_NUMA
442 static int __init arch_acpi_numa_init(void)
446 ret = acpi_numa_init();
448 pr_info("Failed to initialise from firmware\n");
452 return srat_disabled() ? -EINVAL : 0;
455 static int __init arch_acpi_numa_init(void)
462 * arch_numa_init() - Initialize NUMA
464 * Try each configured NUMA initialization method until one succeeds. The
465 * last fallback is dummy single node config encompassing whole memory.
467 void __init arch_numa_init(void)
470 if (!acpi_disabled && !numa_init(arch_acpi_numa_init))
472 if (acpi_disabled && !numa_init(of_numa_init))
476 numa_init(dummy_numa_init);