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 #define pr_fmt(fmt) "NUMA: " fmt
22 #include <linux/acpi.h>
23 #include <linux/memblock.h>
24 #include <linux/module.h>
28 #include <asm/sections.h>
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 };
35 static int numa_distance_cnt;
36 static u8 *numa_distance;
39 static __init int numa_parse_early_param(char *opt)
43 if (!strncmp(opt, "off", 3))
48 early_param("numa", numa_parse_early_param);
50 cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
51 EXPORT_SYMBOL(node_to_cpumask_map);
53 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
56 * Returns a pointer to the bitmask of CPUs on Node 'node'.
58 const struct cpumask *cpumask_of_node(int node)
60 if (WARN_ON(node >= nr_node_ids))
63 if (WARN_ON(node_to_cpumask_map[node] == NULL))
64 return cpu_online_mask;
66 return node_to_cpumask_map[node];
68 EXPORT_SYMBOL(cpumask_of_node);
72 static void numa_update_cpu(unsigned int cpu, bool remove)
74 int nid = cpu_to_node(cpu);
76 if (nid == NUMA_NO_NODE)
80 cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
82 cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
85 void numa_add_cpu(unsigned int cpu)
87 numa_update_cpu(cpu, false);
90 void numa_remove_cpu(unsigned int cpu)
92 numa_update_cpu(cpu, true);
95 void numa_clear_node(unsigned int cpu)
98 set_cpu_numa_node(cpu, NUMA_NO_NODE);
102 * Allocate node_to_cpumask_map based on number of available nodes
103 * Requires node_possible_map to be valid.
105 * Note: cpumask_of_node() is not valid until after this is done.
106 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
108 static void __init setup_node_to_cpumask_map(void)
112 /* setup nr_node_ids if not done yet */
113 if (nr_node_ids == MAX_NUMNODES)
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]);
122 /* cpumask_of_node() will now work */
123 pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
127 * Set the cpu to node and mem mapping
129 void numa_store_cpu_info(unsigned int cpu)
131 set_cpu_numa_node(cpu, cpu_to_node_map[cpu]);
134 void __init early_map_cpu_to_node(unsigned int cpu, int nid)
136 /* fallback to node 0 */
137 if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
140 cpu_to_node_map[cpu] = nid;
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
148 set_cpu_numa_node(cpu, nid);
151 #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
152 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
153 EXPORT_SYMBOL(__per_cpu_offset);
155 static int __init early_cpu_to_node(int cpu)
157 return cpu_to_node_map[cpu];
160 static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
162 return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
165 static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size,
168 int nid = early_cpu_to_node(cpu);
170 return memblock_alloc_try_nid(size, align,
171 __pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid);
174 static void __init pcpu_fc_free(void *ptr, size_t size)
176 memblock_free_early(__pa(ptr), size);
179 void __init setup_per_cpu_areas(void)
186 * Always reserve area for module percpu variables. That's
187 * what the legacy allocator did.
189 rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
190 PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
192 pcpu_fc_alloc, pcpu_fc_free);
194 panic("Failed to initialize percpu areas.");
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];
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
209 * 0 on success, -errno on failure.
211 int __init numa_add_memblk(int nid, u64 start, u64 end)
215 ret = memblock_set_node(start, (end - start), &memblock.memory, nid);
217 pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n",
218 start, (end - 1), nid);
222 node_set(nid, numa_nodes_parsed);
227 * Initialize NODE_DATA for a node on the local memory
229 static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
231 const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
236 if (start_pfn >= end_pfn)
237 pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
239 nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
241 panic("Cannot allocate %zu bytes for node %d data\n",
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);
251 pr_info("NODE_DATA(%d) on node %d\n", nid, tnid);
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;
263 * The current table is freed.
265 void __init numa_free_distance(void)
272 size = numa_distance_cnt * numa_distance_cnt *
273 sizeof(numa_distance[0]);
275 memblock_free(__pa(numa_distance), size);
276 numa_distance_cnt = 0;
277 numa_distance = NULL;
282 * Create a new NUMA distance table.
285 static int __init numa_alloc_distance(void)
291 size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
292 phys = memblock_find_in_range(0, PFN_PHYS(max_pfn),
297 memblock_reserve(phys, size);
299 numa_distance = __va(phys);
300 numa_distance_cnt = nr_node_ids;
302 /* fill with the default distances */
303 for (i = 0; i < numa_distance_cnt; i++)
304 for (j = 0; j < numa_distance_cnt; j++)
305 numa_distance[i * numa_distance_cnt + j] = i == j ?
306 LOCAL_DISTANCE : REMOTE_DISTANCE;
308 pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt);
314 * numa_set_distance - Set inter node NUMA distance from node to node.
315 * @from: the 'from' node to set distance
316 * @to: the 'to' node to set distance
317 * @distance: NUMA distance
319 * Set the distance from node @from to @to to @distance.
320 * If distance table doesn't exist, a warning is printed.
322 * If @from or @to is higher than the highest known node or lower than zero
323 * or @distance doesn't make sense, the call is ignored.
326 void __init numa_set_distance(int from, int to, int distance)
328 if (!numa_distance) {
329 pr_warn_once("Warning: distance table not allocated yet\n");
333 if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
334 from < 0 || to < 0) {
335 pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
340 if ((u8)distance != distance ||
341 (from == to && distance != LOCAL_DISTANCE)) {
342 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
347 numa_distance[from * numa_distance_cnt + to] = distance;
351 * Return NUMA distance @from to @to
353 int __node_distance(int from, int to)
355 if (from >= numa_distance_cnt || to >= numa_distance_cnt)
356 return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
357 return numa_distance[from * numa_distance_cnt + to];
359 EXPORT_SYMBOL(__node_distance);
361 static int __init numa_register_nodes(void)
364 struct memblock_region *mblk;
366 /* Check that valid nid is set to memblks */
367 for_each_memblock(memory, mblk)
368 if (mblk->nid == NUMA_NO_NODE || mblk->nid >= MAX_NUMNODES) {
369 pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
370 mblk->nid, mblk->base,
371 mblk->base + mblk->size - 1);
375 /* Finally register nodes. */
376 for_each_node_mask(nid, numa_nodes_parsed) {
377 unsigned long start_pfn, end_pfn;
379 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
380 setup_node_data(nid, start_pfn, end_pfn);
381 node_set_online(nid);
384 /* Setup online nodes to actual nodes*/
385 node_possible_map = numa_nodes_parsed;
390 static int __init numa_init(int (*init_func)(void))
394 nodes_clear(numa_nodes_parsed);
395 nodes_clear(node_possible_map);
396 nodes_clear(node_online_map);
398 ret = numa_alloc_distance();
404 goto out_free_distance;
406 if (nodes_empty(numa_nodes_parsed)) {
407 pr_info("No NUMA configuration found\n");
409 goto out_free_distance;
412 ret = numa_register_nodes();
414 goto out_free_distance;
416 setup_node_to_cpumask_map();
420 numa_free_distance();
425 * dummy_numa_init - Fallback dummy NUMA init
427 * Used if there's no underlying NUMA architecture, NUMA initialization
428 * fails, or NUMA is disabled on the command line.
430 * Must online at least one node (node 0) and add memory blocks that cover all
431 * allowed memory. It is unlikely that this function fails.
433 static int __init dummy_numa_init(void)
436 struct memblock_region *mblk;
439 pr_info("NUMA disabled\n"); /* Forced off on command line. */
440 pr_info("Faking a node at [mem %#018Lx-%#018Lx]\n",
441 memblock_start_of_DRAM(), memblock_end_of_DRAM() - 1);
443 for_each_memblock(memory, mblk) {
444 ret = numa_add_memblk(0, mblk->base, mblk->base + mblk->size);
448 pr_err("NUMA init failed\n");
457 * arm64_numa_init - Initialize NUMA
459 * Try each configured NUMA initialization method until one succeeds. The
460 * last fallback is dummy single node config encomapssing whole memory.
462 void __init arm64_numa_init(void)
465 if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))
467 if (acpi_disabled && !numa_init(of_numa_init))
471 numa_init(dummy_numa_init);
475 * We hope that we will be hotplugging memory on nodes we already know about,
476 * such that acpi_get_node() succeeds and we never fall back to this...
478 int memory_add_physaddr_to_nid(u64 addr)
480 pr_warn("Unknown node for memory at 0x%llx, assuming node 0\n", addr);