2 * NUMA support, based on the x86 implementation.
4 * Copyright (C) 2015 Cavium Inc.
5 * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
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.
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.
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/>.
20 #include <linux/bootmem.h>
21 #include <linux/memblock.h>
22 #include <linux/module.h>
25 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
26 EXPORT_SYMBOL(node_data);
27 nodemask_t numa_nodes_parsed __initdata;
28 static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
30 static int numa_distance_cnt;
31 static u8 *numa_distance;
34 static __init int numa_parse_early_param(char *opt)
38 if (!strncmp(opt, "off", 3)) {
39 pr_info("%s\n", "NUMA turned off");
44 early_param("numa", numa_parse_early_param);
46 cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
47 EXPORT_SYMBOL(node_to_cpumask_map);
49 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
52 * Returns a pointer to the bitmask of CPUs on Node 'node'.
54 const struct cpumask *cpumask_of_node(int node)
56 if (WARN_ON(node >= nr_node_ids))
59 if (WARN_ON(node_to_cpumask_map[node] == NULL))
60 return cpu_online_mask;
62 return node_to_cpumask_map[node];
64 EXPORT_SYMBOL(cpumask_of_node);
68 static void map_cpu_to_node(unsigned int cpu, int nid)
70 set_cpu_numa_node(cpu, nid);
72 cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
75 void numa_clear_node(unsigned int cpu)
77 int nid = cpu_to_node(cpu);
80 cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
81 set_cpu_numa_node(cpu, NUMA_NO_NODE);
85 * Allocate node_to_cpumask_map based on number of available nodes
86 * Requires node_possible_map to be valid.
88 * Note: cpumask_of_node() is not valid until after this is done.
89 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
91 static void __init setup_node_to_cpumask_map(void)
96 /* setup nr_node_ids if not done yet */
97 if (nr_node_ids == MAX_NUMNODES)
100 /* allocate and clear the mapping */
101 for (node = 0; node < nr_node_ids; node++) {
102 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
103 cpumask_clear(node_to_cpumask_map[node]);
106 for_each_possible_cpu(cpu)
107 set_cpu_numa_node(cpu, NUMA_NO_NODE);
109 /* cpumask_of_node() will now work */
110 pr_debug("NUMA: Node to cpumask map for %d nodes\n", nr_node_ids);
114 * Set the cpu to node and mem mapping
116 void numa_store_cpu_info(unsigned int cpu)
118 map_cpu_to_node(cpu, numa_off ? 0 : cpu_to_node_map[cpu]);
121 void __init early_map_cpu_to_node(unsigned int cpu, int nid)
123 /* fallback to node 0 */
124 if (nid < 0 || nid >= MAX_NUMNODES)
127 cpu_to_node_map[cpu] = nid;
131 * numa_add_memblk - Set node id to memblk
132 * @nid: NUMA node ID of the new memblk
133 * @start: Start address of the new memblk
134 * @size: Size of the new memblk
137 * 0 on success, -errno on failure.
139 int __init numa_add_memblk(int nid, u64 start, u64 size)
143 ret = memblock_set_node(start, size, &memblock.memory, nid);
145 pr_err("NUMA: memblock [0x%llx - 0x%llx] failed to add on node %d\n",
146 start, (start + size - 1), nid);
150 node_set(nid, numa_nodes_parsed);
151 pr_info("NUMA: Adding memblock [0x%llx - 0x%llx] on node %d\n",
152 start, (start + size - 1), nid);
157 * Initialize NODE_DATA for a node on the local memory
159 static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
161 const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
166 pr_info("NUMA: Initmem setup node %d [mem %#010Lx-%#010Lx]\n",
167 nid, start_pfn << PAGE_SHIFT,
168 (end_pfn << PAGE_SHIFT) - 1);
170 nd_pa = memblock_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
173 /* report and initialize */
174 pr_info("NUMA: NODE_DATA [mem %#010Lx-%#010Lx]\n",
175 nd_pa, nd_pa + nd_size - 1);
176 tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
178 pr_info("NUMA: NODE_DATA(%d) on node %d\n", nid, tnid);
181 memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
182 NODE_DATA(nid)->node_id = nid;
183 NODE_DATA(nid)->node_start_pfn = start_pfn;
184 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
190 * The current table is freed.
192 void __init numa_free_distance(void)
199 size = numa_distance_cnt * numa_distance_cnt *
200 sizeof(numa_distance[0]);
202 memblock_free(__pa(numa_distance), size);
203 numa_distance_cnt = 0;
204 numa_distance = NULL;
209 * Create a new NUMA distance table.
212 static int __init numa_alloc_distance(void)
218 size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
219 phys = memblock_find_in_range(0, PFN_PHYS(max_pfn),
224 memblock_reserve(phys, size);
226 numa_distance = __va(phys);
227 numa_distance_cnt = nr_node_ids;
229 /* fill with the default distances */
230 for (i = 0; i < numa_distance_cnt; i++)
231 for (j = 0; j < numa_distance_cnt; j++)
232 numa_distance[i * numa_distance_cnt + j] = i == j ?
233 LOCAL_DISTANCE : REMOTE_DISTANCE;
235 pr_debug("NUMA: Initialized distance table, cnt=%d\n",
242 * numa_set_distance - Set inter node NUMA distance from node to node.
243 * @from: the 'from' node to set distance
244 * @to: the 'to' node to set distance
245 * @distance: NUMA distance
247 * Set the distance from node @from to @to to @distance.
248 * If distance table doesn't exist, a warning is printed.
250 * If @from or @to is higher than the highest known node or lower than zero
251 * or @distance doesn't make sense, the call is ignored.
254 void __init numa_set_distance(int from, int to, int distance)
256 if (!numa_distance) {
257 pr_warn_once("NUMA: Warning: distance table not allocated yet\n");
261 if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
262 from < 0 || to < 0) {
263 pr_warn_once("NUMA: Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
268 if ((u8)distance != distance ||
269 (from == to && distance != LOCAL_DISTANCE)) {
270 pr_warn_once("NUMA: Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
275 numa_distance[from * numa_distance_cnt + to] = distance;
279 * Return NUMA distance @from to @to
281 int __node_distance(int from, int to)
283 if (from >= numa_distance_cnt || to >= numa_distance_cnt)
284 return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
285 return numa_distance[from * numa_distance_cnt + to];
287 EXPORT_SYMBOL(__node_distance);
289 static int __init numa_register_nodes(void)
292 struct memblock_region *mblk;
294 /* Check that valid nid is set to memblks */
295 for_each_memblock(memory, mblk)
296 if (mblk->nid == NUMA_NO_NODE || mblk->nid >= MAX_NUMNODES) {
297 pr_warn("NUMA: Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
298 mblk->nid, mblk->base,
299 mblk->base + mblk->size - 1);
303 /* Finally register nodes. */
304 for_each_node_mask(nid, numa_nodes_parsed) {
305 unsigned long start_pfn, end_pfn;
307 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
308 setup_node_data(nid, start_pfn, end_pfn);
309 node_set_online(nid);
312 /* Setup online nodes to actual nodes*/
313 node_possible_map = numa_nodes_parsed;
318 static int __init numa_init(int (*init_func)(void))
322 nodes_clear(numa_nodes_parsed);
323 nodes_clear(node_possible_map);
324 nodes_clear(node_online_map);
325 numa_free_distance();
327 ret = numa_alloc_distance();
335 if (nodes_empty(numa_nodes_parsed))
338 ret = numa_register_nodes();
342 setup_node_to_cpumask_map();
344 /* init boot processor */
345 cpu_to_node_map[0] = 0;
346 map_cpu_to_node(0, 0);
352 * dummy_numa_init - Fallback dummy NUMA init
354 * Used if there's no underlying NUMA architecture, NUMA initialization
355 * fails, or NUMA is disabled on the command line.
357 * Must online at least one node (node 0) and add memory blocks that cover all
358 * allowed memory. It is unlikely that this function fails.
360 static int __init dummy_numa_init(void)
363 struct memblock_region *mblk;
365 pr_info("%s\n", "No NUMA configuration found");
366 pr_info("NUMA: Faking a node at [mem %#018Lx-%#018Lx]\n",
367 0LLU, PFN_PHYS(max_pfn) - 1);
369 for_each_memblock(memory, mblk) {
370 ret = numa_add_memblk(0, mblk->base, mblk->size);
374 pr_err("NUMA init failed\n");
383 * arm64_numa_init - Initialize NUMA
385 * Try each configured NUMA initialization method until one succeeds. The
386 * last fallback is dummy single node config encomapssing whole memory.
388 void __init arm64_numa_init(void)
391 if (!numa_init(of_numa_init))
395 numa_init(dummy_numa_init);