1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Common code for 32 and 64-bit NUMA */
3 #include <linux/acpi.h>
4 #include <linux/kernel.h>
6 #include <linux/string.h>
7 #include <linux/init.h>
8 #include <linux/memblock.h>
9 #include <linux/mmzone.h>
10 #include <linux/ctype.h>
11 #include <linux/nodemask.h>
12 #include <linux/sched.h>
13 #include <linux/topology.h>
15 #include <asm/e820/api.h>
16 #include <asm/proto.h>
18 #include <asm/amd_nb.h>
20 #include "numa_internal.h"
23 nodemask_t numa_nodes_parsed __initdata;
25 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
26 EXPORT_SYMBOL(node_data);
28 static struct numa_meminfo numa_meminfo __initdata_or_meminfo;
29 static struct numa_meminfo numa_reserved_meminfo __initdata_or_meminfo;
31 static int numa_distance_cnt;
32 static u8 *numa_distance;
34 static __init int numa_setup(char *opt)
38 if (!strncmp(opt, "off", 3))
40 if (!strncmp(opt, "fake=", 5))
41 return numa_emu_cmdline(opt + 5);
42 if (!strncmp(opt, "noacpi", 6))
44 if (!strncmp(opt, "nohmat", 6))
48 early_param("numa", numa_setup);
51 * apicid, cpu, node mappings
53 s16 __apicid_to_node[MAX_LOCAL_APIC] = {
54 [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
57 int numa_cpu_node(int cpu)
59 int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
61 if (apicid != BAD_APICID)
62 return __apicid_to_node[apicid];
66 cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
67 EXPORT_SYMBOL(node_to_cpumask_map);
70 * Map cpu index to node index
72 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
73 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
75 void numa_set_node(int cpu, int node)
77 int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
79 /* early setting, no percpu area yet */
80 if (cpu_to_node_map) {
81 cpu_to_node_map[cpu] = node;
85 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
86 if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) {
87 printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu);
92 per_cpu(x86_cpu_to_node_map, cpu) = node;
94 set_cpu_numa_node(cpu, node);
97 void numa_clear_node(int cpu)
99 numa_set_node(cpu, NUMA_NO_NODE);
103 * Allocate node_to_cpumask_map based on number of available nodes
104 * Requires node_possible_map to be valid.
106 * Note: cpumask_of_node() is not valid until after this is done.
107 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
109 void __init setup_node_to_cpumask_map(void)
113 /* setup nr_node_ids if not done yet */
114 if (nr_node_ids == MAX_NUMNODES)
117 /* allocate the map */
118 for (node = 0; node < nr_node_ids; node++)
119 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
121 /* cpumask_of_node() will now work */
122 pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
125 static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
126 struct numa_meminfo *mi)
128 /* ignore zero length blks */
132 /* whine about and ignore invalid blks */
133 if (start > end || nid < 0 || nid >= MAX_NUMNODES) {
134 pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
135 nid, start, end - 1);
139 if (mi->nr_blks >= NR_NODE_MEMBLKS) {
140 pr_err("too many memblk ranges\n");
144 mi->blk[mi->nr_blks].start = start;
145 mi->blk[mi->nr_blks].end = end;
146 mi->blk[mi->nr_blks].nid = nid;
152 * numa_remove_memblk_from - Remove one numa_memblk from a numa_meminfo
153 * @idx: Index of memblk to remove
154 * @mi: numa_meminfo to remove memblk from
156 * Remove @idx'th numa_memblk from @mi by shifting @mi->blk[] and
157 * decrementing @mi->nr_blks.
159 void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi)
162 memmove(&mi->blk[idx], &mi->blk[idx + 1],
163 (mi->nr_blks - idx) * sizeof(mi->blk[0]));
167 * numa_move_tail_memblk - Move a numa_memblk from one numa_meminfo to another
168 * @dst: numa_meminfo to append block to
169 * @idx: Index of memblk to remove
170 * @src: numa_meminfo to remove memblk from
172 static void __init numa_move_tail_memblk(struct numa_meminfo *dst, int idx,
173 struct numa_meminfo *src)
175 dst->blk[dst->nr_blks++] = src->blk[idx];
176 numa_remove_memblk_from(idx, src);
180 * numa_add_memblk - Add one numa_memblk to numa_meminfo
181 * @nid: NUMA node ID of the new memblk
182 * @start: Start address of the new memblk
183 * @end: End address of the new memblk
185 * Add a new memblk to the default numa_meminfo.
188 * 0 on success, -errno on failure.
190 int __init numa_add_memblk(int nid, u64 start, u64 end)
192 return numa_add_memblk_to(nid, start, end, &numa_meminfo);
195 /* Allocate NODE_DATA for a node on the local memory */
196 static void __init alloc_node_data(int nid)
198 const size_t nd_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
204 * Allocate node data. Try node-local memory and then any node.
205 * Never allocate in DMA zone.
207 nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
209 pr_err("Cannot find %zu bytes in any node (initial node: %d)\n",
215 /* report and initialize */
216 printk(KERN_INFO "NODE_DATA(%d) allocated [mem %#010Lx-%#010Lx]\n", nid,
217 nd_pa, nd_pa + nd_size - 1);
218 tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
220 printk(KERN_INFO " NODE_DATA(%d) on node %d\n", nid, tnid);
223 memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
225 node_set_online(nid);
229 * numa_cleanup_meminfo - Cleanup a numa_meminfo
230 * @mi: numa_meminfo to clean up
232 * Sanitize @mi by merging and removing unnecessary memblks. Also check for
233 * conflicts and clear unused memblks.
236 * 0 on success, -errno on failure.
238 int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
241 const u64 high = PFN_PHYS(max_pfn);
244 /* first, trim all entries */
245 for (i = 0; i < mi->nr_blks; i++) {
246 struct numa_memblk *bi = &mi->blk[i];
248 /* move / save reserved memory ranges */
249 if (!memblock_overlaps_region(&memblock.memory,
250 bi->start, bi->end - bi->start)) {
251 numa_move_tail_memblk(&numa_reserved_meminfo, i--, mi);
255 /* make sure all non-reserved blocks are inside the limits */
256 bi->start = max(bi->start, low);
257 bi->end = min(bi->end, high);
259 /* and there's no empty block */
260 if (bi->start >= bi->end)
261 numa_remove_memblk_from(i--, mi);
264 /* merge neighboring / overlapping entries */
265 for (i = 0; i < mi->nr_blks; i++) {
266 struct numa_memblk *bi = &mi->blk[i];
268 for (j = i + 1; j < mi->nr_blks; j++) {
269 struct numa_memblk *bj = &mi->blk[j];
273 * See whether there are overlapping blocks. Whine
274 * about but allow overlaps of the same nid. They
275 * will be merged below.
277 if (bi->end > bj->start && bi->start < bj->end) {
278 if (bi->nid != bj->nid) {
279 pr_err("node %d [mem %#010Lx-%#010Lx] overlaps with node %d [mem %#010Lx-%#010Lx]\n",
280 bi->nid, bi->start, bi->end - 1,
281 bj->nid, bj->start, bj->end - 1);
284 pr_warn("Warning: node %d [mem %#010Lx-%#010Lx] overlaps with itself [mem %#010Lx-%#010Lx]\n",
285 bi->nid, bi->start, bi->end - 1,
286 bj->start, bj->end - 1);
290 * Join together blocks on the same node, holes
291 * between which don't overlap with memory on other
294 if (bi->nid != bj->nid)
296 start = min(bi->start, bj->start);
297 end = max(bi->end, bj->end);
298 for (k = 0; k < mi->nr_blks; k++) {
299 struct numa_memblk *bk = &mi->blk[k];
301 if (bi->nid == bk->nid)
303 if (start < bk->end && end > bk->start)
308 printk(KERN_INFO "NUMA: Node %d [mem %#010Lx-%#010Lx] + [mem %#010Lx-%#010Lx] -> [mem %#010Lx-%#010Lx]\n",
309 bi->nid, bi->start, bi->end - 1, bj->start,
310 bj->end - 1, start, end - 1);
313 numa_remove_memblk_from(j--, mi);
317 /* clear unused ones */
318 for (i = mi->nr_blks; i < ARRAY_SIZE(mi->blk); i++) {
319 mi->blk[i].start = mi->blk[i].end = 0;
320 mi->blk[i].nid = NUMA_NO_NODE;
327 * Set nodes, which have memory in @mi, in *@nodemask.
329 static void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
330 const struct numa_meminfo *mi)
334 for (i = 0; i < ARRAY_SIZE(mi->blk); i++)
335 if (mi->blk[i].start != mi->blk[i].end &&
336 mi->blk[i].nid != NUMA_NO_NODE)
337 node_set(mi->blk[i].nid, *nodemask);
341 * numa_reset_distance - Reset NUMA distance table
343 * The current table is freed. The next numa_set_distance() call will
346 void __init numa_reset_distance(void)
348 size_t size = numa_distance_cnt * numa_distance_cnt * sizeof(numa_distance[0]);
350 /* numa_distance could be 1LU marking allocation failure, test cnt */
351 if (numa_distance_cnt)
352 memblock_free(__pa(numa_distance), size);
353 numa_distance_cnt = 0;
354 numa_distance = NULL; /* enable table creation */
357 static int __init numa_alloc_distance(void)
359 nodemask_t nodes_parsed;
364 /* size the new table and allocate it */
365 nodes_parsed = numa_nodes_parsed;
366 numa_nodemask_from_meminfo(&nodes_parsed, &numa_meminfo);
368 for_each_node_mask(i, nodes_parsed)
371 size = cnt * cnt * sizeof(numa_distance[0]);
373 phys = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
376 pr_warn("Warning: can't allocate distance table!\n");
377 /* don't retry until explicitly reset */
378 numa_distance = (void *)1LU;
381 memblock_reserve(phys, size);
383 numa_distance = __va(phys);
384 numa_distance_cnt = cnt;
386 /* fill with the default distances */
387 for (i = 0; i < cnt; i++)
388 for (j = 0; j < cnt; j++)
389 numa_distance[i * cnt + j] = i == j ?
390 LOCAL_DISTANCE : REMOTE_DISTANCE;
391 printk(KERN_DEBUG "NUMA: Initialized distance table, cnt=%d\n", cnt);
397 * numa_set_distance - Set NUMA distance from one NUMA to another
398 * @from: the 'from' node to set distance
399 * @to: the 'to' node to set distance
400 * @distance: NUMA distance
402 * Set the distance from node @from to @to to @distance. If distance table
403 * doesn't exist, one which is large enough to accommodate all the currently
404 * known nodes will be created.
406 * If such table cannot be allocated, a warning is printed and further
407 * calls are ignored until the distance table is reset with
408 * numa_reset_distance().
410 * If @from or @to is higher than the highest known node or lower than zero
411 * at the time of table creation or @distance doesn't make sense, the call
413 * This is to allow simplification of specific NUMA config implementations.
415 void __init numa_set_distance(int from, int to, int distance)
417 if (!numa_distance && numa_alloc_distance() < 0)
420 if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
421 from < 0 || to < 0) {
422 pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
427 if ((u8)distance != distance ||
428 (from == to && distance != LOCAL_DISTANCE)) {
429 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
434 numa_distance[from * numa_distance_cnt + to] = distance;
437 int __node_distance(int from, int to)
439 if (from >= numa_distance_cnt || to >= numa_distance_cnt)
440 return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
441 return numa_distance[from * numa_distance_cnt + to];
443 EXPORT_SYMBOL(__node_distance);
446 * Sanity check to catch more bad NUMA configurations (they are amazingly
447 * common). Make sure the nodes cover all memory.
449 static bool __init numa_meminfo_cover_memory(const struct numa_meminfo *mi)
451 u64 numaram, e820ram;
455 for (i = 0; i < mi->nr_blks; i++) {
456 u64 s = mi->blk[i].start >> PAGE_SHIFT;
457 u64 e = mi->blk[i].end >> PAGE_SHIFT;
459 numaram -= __absent_pages_in_range(mi->blk[i].nid, s, e);
460 if ((s64)numaram < 0)
464 e820ram = max_pfn - absent_pages_in_range(0, max_pfn);
466 /* We seem to lose 3 pages somewhere. Allow 1M of slack. */
467 if ((s64)(e820ram - numaram) >= (1 << (20 - PAGE_SHIFT))) {
468 printk(KERN_ERR "NUMA: nodes only cover %LuMB of your %LuMB e820 RAM. Not used.\n",
469 (numaram << PAGE_SHIFT) >> 20,
470 (e820ram << PAGE_SHIFT) >> 20);
477 * Mark all currently memblock-reserved physical memory (which covers the
478 * kernel's own memory ranges) as hot-unswappable.
480 static void __init numa_clear_kernel_node_hotplug(void)
482 nodemask_t reserved_nodemask = NODE_MASK_NONE;
483 struct memblock_region *mb_region;
487 * We have to do some preprocessing of memblock regions, to
488 * make them suitable for reservation.
490 * At this time, all memory regions reserved by memblock are
491 * used by the kernel, but those regions are not split up
492 * along node boundaries yet, and don't necessarily have their
493 * node ID set yet either.
495 * So iterate over all memory known to the x86 architecture,
496 * and use those ranges to set the nid in memblock.reserved.
497 * This will split up the memblock regions along node
498 * boundaries and will set the node IDs as well.
500 for (i = 0; i < numa_meminfo.nr_blks; i++) {
501 struct numa_memblk *mb = numa_meminfo.blk + i;
504 ret = memblock_set_node(mb->start, mb->end - mb->start, &memblock.reserved, mb->nid);
509 * Now go over all reserved memblock regions, to construct a
510 * node mask of all kernel reserved memory areas.
512 * [ Note, when booting with mem=nn[kMG] or in a kdump kernel,
513 * numa_meminfo might not include all memblock.reserved
514 * memory ranges, because quirks such as trim_snb_memory()
515 * reserve specific pages for Sandy Bridge graphics. ]
517 for_each_reserved_mem_region(mb_region) {
518 int nid = memblock_get_region_node(mb_region);
520 if (nid != MAX_NUMNODES)
521 node_set(nid, reserved_nodemask);
525 * Finally, clear the MEMBLOCK_HOTPLUG flag for all memory
526 * belonging to the reserved node mask.
528 * Note that this will include memory regions that reside
529 * on nodes that contain kernel memory - entire nodes
530 * become hot-unpluggable:
532 for (i = 0; i < numa_meminfo.nr_blks; i++) {
533 struct numa_memblk *mb = numa_meminfo.blk + i;
535 if (!node_isset(mb->nid, reserved_nodemask))
538 memblock_clear_hotplug(mb->start, mb->end - mb->start);
542 static int __init numa_register_memblks(struct numa_meminfo *mi)
546 /* Account for nodes with cpus and no memory */
547 node_possible_map = numa_nodes_parsed;
548 numa_nodemask_from_meminfo(&node_possible_map, mi);
549 if (WARN_ON(nodes_empty(node_possible_map)))
552 for (i = 0; i < mi->nr_blks; i++) {
553 struct numa_memblk *mb = &mi->blk[i];
554 memblock_set_node(mb->start, mb->end - mb->start,
555 &memblock.memory, mb->nid);
559 * At very early time, the kernel have to use some memory such as
560 * loading the kernel image. We cannot prevent this anyway. So any
561 * node the kernel resides in should be un-hotpluggable.
563 * And when we come here, alloc node data won't fail.
565 numa_clear_kernel_node_hotplug();
568 * If sections array is gonna be used for pfn -> nid mapping, check
569 * whether its granularity is fine enough.
571 if (IS_ENABLED(NODE_NOT_IN_PAGE_FLAGS)) {
572 unsigned long pfn_align = node_map_pfn_alignment();
574 if (pfn_align && pfn_align < PAGES_PER_SECTION) {
575 pr_warn("Node alignment %LuMB < min %LuMB, rejecting NUMA config\n",
576 PFN_PHYS(pfn_align) >> 20,
577 PFN_PHYS(PAGES_PER_SECTION) >> 20);
581 if (!numa_meminfo_cover_memory(mi))
584 /* Finally register nodes. */
585 for_each_node_mask(nid, node_possible_map) {
586 u64 start = PFN_PHYS(max_pfn);
589 for (i = 0; i < mi->nr_blks; i++) {
590 if (nid != mi->blk[i].nid)
592 start = min(mi->blk[i].start, start);
593 end = max(mi->blk[i].end, end);
600 * Don't confuse VM with a node that doesn't have the
601 * minimum amount of memory:
603 if (end && (end - start) < NODE_MIN_SIZE)
606 alloc_node_data(nid);
609 /* Dump memblock with node info and return. */
615 * There are unfortunately some poorly designed mainboards around that
616 * only connect memory to a single CPU. This breaks the 1:1 cpu->node
617 * mapping. To avoid this fill in the mapping for all possible CPUs,
618 * as the number of CPUs is not known yet. We round robin the existing
621 static void __init numa_init_array(void)
625 rr = first_node(node_online_map);
626 for (i = 0; i < nr_cpu_ids; i++) {
627 if (early_cpu_to_node(i) != NUMA_NO_NODE)
629 numa_set_node(i, rr);
630 rr = next_node_in(rr, node_online_map);
634 static int __init numa_init(int (*init_func)(void))
639 for (i = 0; i < MAX_LOCAL_APIC; i++)
640 set_apicid_to_node(i, NUMA_NO_NODE);
642 nodes_clear(numa_nodes_parsed);
643 nodes_clear(node_possible_map);
644 nodes_clear(node_online_map);
645 memset(&numa_meminfo, 0, sizeof(numa_meminfo));
646 WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.memory,
648 WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.reserved,
650 /* In case that parsing SRAT failed. */
651 WARN_ON(memblock_clear_hotplug(0, ULLONG_MAX));
652 numa_reset_distance();
659 * We reset memblock back to the top-down direction
660 * here because if we configured ACPI_NUMA, we have
661 * parsed SRAT in init_func(). It is ok to have the
662 * reset here even if we did't configure ACPI_NUMA
663 * or acpi numa init fails and fallbacks to dummy
666 memblock_set_bottom_up(false);
668 ret = numa_cleanup_meminfo(&numa_meminfo);
672 numa_emulation(&numa_meminfo, numa_distance_cnt);
674 ret = numa_register_memblks(&numa_meminfo);
678 for (i = 0; i < nr_cpu_ids; i++) {
679 int nid = early_cpu_to_node(i);
681 if (nid == NUMA_NO_NODE)
683 if (!node_online(nid))
692 * dummy_numa_init - Fallback dummy NUMA init
694 * Used if there's no underlying NUMA architecture, NUMA initialization
695 * fails, or NUMA is disabled on the command line.
697 * Must online at least one node and add memory blocks that cover all
698 * allowed memory. This function must not fail.
700 static int __init dummy_numa_init(void)
702 printk(KERN_INFO "%s\n",
703 numa_off ? "NUMA turned off" : "No NUMA configuration found");
704 printk(KERN_INFO "Faking a node at [mem %#018Lx-%#018Lx]\n",
705 0LLU, PFN_PHYS(max_pfn) - 1);
707 node_set(0, numa_nodes_parsed);
708 numa_add_memblk(0, 0, PFN_PHYS(max_pfn));
714 * x86_numa_init - Initialize NUMA
716 * Try each configured NUMA initialization method until one succeeds. The
717 * last fallback is dummy single node config encompassing whole memory and
720 void __init x86_numa_init(void)
723 #ifdef CONFIG_ACPI_NUMA
724 if (!numa_init(x86_acpi_numa_init))
727 #ifdef CONFIG_AMD_NUMA
728 if (!numa_init(amd_numa_init))
733 numa_init(dummy_numa_init);
736 static void __init init_memory_less_node(int nid)
738 /* Allocate and initialize node data. Memory-less node is now online.*/
739 alloc_node_data(nid);
740 free_area_init_memoryless_node(nid);
743 * All zonelists will be built later in start_kernel() after per cpu
744 * areas are initialized.
749 * A node may exist which has one or more Generic Initiators but no CPUs and no
752 * This function must be called after init_cpu_to_node(), to ensure that any
753 * memoryless CPU nodes have already been brought online, and before the
754 * node_data[nid] is needed for zone list setup in build_all_zonelists().
756 * When this function is called, any nodes containing either memory and/or CPUs
757 * will already be online and there is no need to do anything extra, even if
758 * they also contain one or more Generic Initiators.
760 void __init init_gi_nodes(void)
764 for_each_node_state(nid, N_GENERIC_INITIATOR)
765 if (!node_online(nid))
766 init_memory_less_node(nid);
770 * Setup early cpu_to_node.
772 * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
773 * and apicid_to_node[] tables have valid entries for a CPU.
774 * This means we skip cpu_to_node[] initialisation for NUMA
775 * emulation and faking node case (when running a kernel compiled
776 * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
777 * is already initialized in a round robin manner at numa_init_array,
778 * prior to this call, and this initialization is good enough
779 * for the fake NUMA cases.
781 * Called before the per_cpu areas are setup.
783 void __init init_cpu_to_node(void)
786 u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
788 BUG_ON(cpu_to_apicid == NULL);
790 for_each_possible_cpu(cpu) {
791 int node = numa_cpu_node(cpu);
793 if (node == NUMA_NO_NODE)
796 if (!node_online(node))
797 init_memory_less_node(node);
799 numa_set_node(cpu, node);
803 #ifndef CONFIG_DEBUG_PER_CPU_MAPS
805 # ifndef CONFIG_NUMA_EMU
806 void numa_add_cpu(int cpu)
808 cpumask_set_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
811 void numa_remove_cpu(int cpu)
813 cpumask_clear_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
815 # endif /* !CONFIG_NUMA_EMU */
817 #else /* !CONFIG_DEBUG_PER_CPU_MAPS */
819 int __cpu_to_node(int cpu)
821 if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
823 "cpu_to_node(%d): usage too early!\n", cpu);
825 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
827 return per_cpu(x86_cpu_to_node_map, cpu);
829 EXPORT_SYMBOL(__cpu_to_node);
832 * Same function as cpu_to_node() but used if called before the
833 * per_cpu areas are setup.
835 int early_cpu_to_node(int cpu)
837 if (early_per_cpu_ptr(x86_cpu_to_node_map))
838 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
840 if (!cpu_possible(cpu)) {
842 "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
846 return per_cpu(x86_cpu_to_node_map, cpu);
849 void debug_cpumask_set_cpu(int cpu, int node, bool enable)
851 struct cpumask *mask;
853 if (node == NUMA_NO_NODE) {
854 /* early_cpu_to_node() already emits a warning and trace */
857 mask = node_to_cpumask_map[node];
859 pr_err("node_to_cpumask_map[%i] NULL\n", node);
865 cpumask_set_cpu(cpu, mask);
867 cpumask_clear_cpu(cpu, mask);
869 printk(KERN_DEBUG "%s cpu %d node %d: mask now %*pbl\n",
870 enable ? "numa_add_cpu" : "numa_remove_cpu",
871 cpu, node, cpumask_pr_args(mask));
875 # ifndef CONFIG_NUMA_EMU
876 static void numa_set_cpumask(int cpu, bool enable)
878 debug_cpumask_set_cpu(cpu, early_cpu_to_node(cpu), enable);
881 void numa_add_cpu(int cpu)
883 numa_set_cpumask(cpu, true);
886 void numa_remove_cpu(int cpu)
888 numa_set_cpumask(cpu, false);
890 # endif /* !CONFIG_NUMA_EMU */
893 * Returns a pointer to the bitmask of CPUs on Node 'node'.
895 const struct cpumask *cpumask_of_node(int node)
897 if ((unsigned)node >= nr_node_ids) {
899 "cpumask_of_node(%d): (unsigned)node >= nr_node_ids(%u)\n",
902 return cpu_none_mask;
904 if (node_to_cpumask_map[node] == NULL) {
906 "cpumask_of_node(%d): no node_to_cpumask_map!\n",
909 return cpu_online_mask;
911 return node_to_cpumask_map[node];
913 EXPORT_SYMBOL(cpumask_of_node);
915 #endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
917 #ifdef CONFIG_NUMA_KEEP_MEMINFO
918 static int meminfo_to_nid(struct numa_meminfo *mi, u64 start)
922 for (i = 0; i < mi->nr_blks; i++)
923 if (mi->blk[i].start <= start && mi->blk[i].end > start)
924 return mi->blk[i].nid;
928 int phys_to_target_node(phys_addr_t start)
930 int nid = meminfo_to_nid(&numa_meminfo, start);
933 * Prefer online nodes, but if reserved memory might be
934 * hot-added continue the search with reserved ranges.
936 if (nid != NUMA_NO_NODE)
939 return meminfo_to_nid(&numa_reserved_meminfo, start);
941 EXPORT_SYMBOL_GPL(phys_to_target_node);
943 int memory_add_physaddr_to_nid(u64 start)
945 int nid = meminfo_to_nid(&numa_meminfo, start);
947 if (nid == NUMA_NO_NODE)
948 nid = numa_meminfo.blk[0].nid;
951 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);