1
2#include <linux/acpi.h>
3#include <linux/kernel.h>
4#include <linux/mm.h>
5#include <linux/string.h>
6#include <linux/init.h>
7#include <linux/bootmem.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>
14
15#include <asm/e820/api.h>
16#include <asm/proto.h>
17#include <asm/dma.h>
18#include <asm/amd_nb.h>
19
20#include "numa_internal.h"
21
22int numa_off;
23nodemask_t numa_nodes_parsed __initdata;
24
25struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
26EXPORT_SYMBOL(node_data);
27
28static struct numa_meminfo numa_meminfo
29#ifndef CONFIG_MEMORY_HOTPLUG
30__initdata
31#endif
32;
33
34static int numa_distance_cnt;
35static u8 *numa_distance;
36
37static __init int numa_setup(char *opt)
38{
39 if (!opt)
40 return -EINVAL;
41 if (!strncmp(opt, "off", 3))
42 numa_off = 1;
43#ifdef CONFIG_NUMA_EMU
44 if (!strncmp(opt, "fake=", 5))
45 numa_emu_cmdline(opt + 5);
46#endif
47#ifdef CONFIG_ACPI_NUMA
48 if (!strncmp(opt, "noacpi", 6))
49 acpi_numa = -1;
50#endif
51 return 0;
52}
53early_param("numa", numa_setup);
54
55
56
57
58s16 __apicid_to_node[MAX_LOCAL_APIC] = {
59 [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
60};
61
62int numa_cpu_node(int cpu)
63{
64 int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
65
66 if (apicid != BAD_APICID)
67 return __apicid_to_node[apicid];
68 return NUMA_NO_NODE;
69}
70
71cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
72EXPORT_SYMBOL(node_to_cpumask_map);
73
74
75
76
77DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
78EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
79
80void numa_set_node(int cpu, int node)
81{
82 int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
83
84
85 if (cpu_to_node_map) {
86 cpu_to_node_map[cpu] = node;
87 return;
88 }
89
90#ifdef CONFIG_DEBUG_PER_CPU_MAPS
91 if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) {
92 printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu);
93 dump_stack();
94 return;
95 }
96#endif
97 per_cpu(x86_cpu_to_node_map, cpu) = node;
98
99 set_cpu_numa_node(cpu, node);
100}
101
102void numa_clear_node(int cpu)
103{
104 numa_set_node(cpu, NUMA_NO_NODE);
105}
106
107
108
109
110
111
112
113
114void __init setup_node_to_cpumask_map(void)
115{
116 unsigned int node;
117
118
119 if (nr_node_ids == MAX_NUMNODES)
120 setup_nr_node_ids();
121
122
123 for (node = 0; node < nr_node_ids; node++)
124 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
125
126
127 pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids);
128}
129
130static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
131 struct numa_meminfo *mi)
132{
133
134 if (start == end)
135 return 0;
136
137
138 if (start > end || nid < 0 || nid >= MAX_NUMNODES) {
139 pr_warning("NUMA: Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
140 nid, start, end - 1);
141 return 0;
142 }
143
144 if (mi->nr_blks >= NR_NODE_MEMBLKS) {
145 pr_err("NUMA: too many memblk ranges\n");
146 return -EINVAL;
147 }
148
149 mi->blk[mi->nr_blks].start = start;
150 mi->blk[mi->nr_blks].end = end;
151 mi->blk[mi->nr_blks].nid = nid;
152 mi->nr_blks++;
153 return 0;
154}
155
156
157
158
159
160
161
162
163
164void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi)
165{
166 mi->nr_blks--;
167 memmove(&mi->blk[idx], &mi->blk[idx + 1],
168 (mi->nr_blks - idx) * sizeof(mi->blk[0]));
169}
170
171
172
173
174
175
176
177
178
179
180
181
182int __init numa_add_memblk(int nid, u64 start, u64 end)
183{
184 return numa_add_memblk_to(nid, start, end, &numa_meminfo);
185}
186
187
188static void __init alloc_node_data(int nid)
189{
190 const size_t nd_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
191 u64 nd_pa;
192 void *nd;
193 int tnid;
194
195
196
197
198
199 nd_pa = memblock_alloc_nid(nd_size, SMP_CACHE_BYTES, nid);
200 if (!nd_pa) {
201 nd_pa = __memblock_alloc_base(nd_size, SMP_CACHE_BYTES,
202 MEMBLOCK_ALLOC_ACCESSIBLE);
203 if (!nd_pa) {
204 pr_err("Cannot find %zu bytes in any node (initial node: %d)\n",
205 nd_size, nid);
206 return;
207 }
208 }
209 nd = __va(nd_pa);
210
211
212 printk(KERN_INFO "NODE_DATA(%d) allocated [mem %#010Lx-%#010Lx]\n", nid,
213 nd_pa, nd_pa + nd_size - 1);
214 tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
215 if (tnid != nid)
216 printk(KERN_INFO " NODE_DATA(%d) on node %d\n", nid, tnid);
217
218 node_data[nid] = nd;
219 memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
220
221 node_set_online(nid);
222}
223
224
225
226
227
228
229
230
231
232
233
234int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
235{
236 const u64 low = 0;
237 const u64 high = PFN_PHYS(max_pfn);
238 int i, j, k;
239
240
241 for (i = 0; i < mi->nr_blks; i++) {
242 struct numa_memblk *bi = &mi->blk[i];
243
244
245 bi->start = max(bi->start, low);
246 bi->end = min(bi->end, high);
247
248
249 if (bi->start >= bi->end ||
250 !memblock_overlaps_region(&memblock.memory,
251 bi->start, bi->end - bi->start))
252 numa_remove_memblk_from(i--, mi);
253 }
254
255
256 for (i = 0; i < mi->nr_blks; i++) {
257 struct numa_memblk *bi = &mi->blk[i];
258
259 for (j = i + 1; j < mi->nr_blks; j++) {
260 struct numa_memblk *bj = &mi->blk[j];
261 u64 start, end;
262
263
264
265
266
267
268 if (bi->end > bj->start && bi->start < bj->end) {
269 if (bi->nid != bj->nid) {
270 pr_err("NUMA: node %d [mem %#010Lx-%#010Lx] overlaps with node %d [mem %#010Lx-%#010Lx]\n",
271 bi->nid, bi->start, bi->end - 1,
272 bj->nid, bj->start, bj->end - 1);
273 return -EINVAL;
274 }
275 pr_warning("NUMA: Warning: node %d [mem %#010Lx-%#010Lx] overlaps with itself [mem %#010Lx-%#010Lx]\n",
276 bi->nid, bi->start, bi->end - 1,
277 bj->start, bj->end - 1);
278 }
279
280
281
282
283
284
285 if (bi->nid != bj->nid)
286 continue;
287 start = min(bi->start, bj->start);
288 end = max(bi->end, bj->end);
289 for (k = 0; k < mi->nr_blks; k++) {
290 struct numa_memblk *bk = &mi->blk[k];
291
292 if (bi->nid == bk->nid)
293 continue;
294 if (start < bk->end && end > bk->start)
295 break;
296 }
297 if (k < mi->nr_blks)
298 continue;
299 printk(KERN_INFO "NUMA: Node %d [mem %#010Lx-%#010Lx] + [mem %#010Lx-%#010Lx] -> [mem %#010Lx-%#010Lx]\n",
300 bi->nid, bi->start, bi->end - 1, bj->start,
301 bj->end - 1, start, end - 1);
302 bi->start = start;
303 bi->end = end;
304 numa_remove_memblk_from(j--, mi);
305 }
306 }
307
308
309 for (i = mi->nr_blks; i < ARRAY_SIZE(mi->blk); i++) {
310 mi->blk[i].start = mi->blk[i].end = 0;
311 mi->blk[i].nid = NUMA_NO_NODE;
312 }
313
314 return 0;
315}
316
317
318
319
320static void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
321 const struct numa_meminfo *mi)
322{
323 int i;
324
325 for (i = 0; i < ARRAY_SIZE(mi->blk); i++)
326 if (mi->blk[i].start != mi->blk[i].end &&
327 mi->blk[i].nid != NUMA_NO_NODE)
328 node_set(mi->blk[i].nid, *nodemask);
329}
330
331
332
333
334
335
336
337void __init numa_reset_distance(void)
338{
339 size_t size = numa_distance_cnt * numa_distance_cnt * sizeof(numa_distance[0]);
340
341
342 if (numa_distance_cnt)
343 memblock_free(__pa(numa_distance), size);
344 numa_distance_cnt = 0;
345 numa_distance = NULL;
346}
347
348static int __init numa_alloc_distance(void)
349{
350 nodemask_t nodes_parsed;
351 size_t size;
352 int i, j, cnt = 0;
353 u64 phys;
354
355
356 nodes_parsed = numa_nodes_parsed;
357 numa_nodemask_from_meminfo(&nodes_parsed, &numa_meminfo);
358
359 for_each_node_mask(i, nodes_parsed)
360 cnt = i;
361 cnt++;
362 size = cnt * cnt * sizeof(numa_distance[0]);
363
364 phys = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
365 size, PAGE_SIZE);
366 if (!phys) {
367 pr_warning("NUMA: Warning: can't allocate distance table!\n");
368
369 numa_distance = (void *)1LU;
370 return -ENOMEM;
371 }
372 memblock_reserve(phys, size);
373
374 numa_distance = __va(phys);
375 numa_distance_cnt = cnt;
376
377
378 for (i = 0; i < cnt; i++)
379 for (j = 0; j < cnt; j++)
380 numa_distance[i * cnt + j] = i == j ?
381 LOCAL_DISTANCE : REMOTE_DISTANCE;
382 printk(KERN_DEBUG "NUMA: Initialized distance table, cnt=%d\n", cnt);
383
384 return 0;
385}
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406void __init numa_set_distance(int from, int to, int distance)
407{
408 if (!numa_distance && numa_alloc_distance() < 0)
409 return;
410
411 if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
412 from < 0 || to < 0) {
413 pr_warn_once("NUMA: Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
414 from, to, distance);
415 return;
416 }
417
418 if ((u8)distance != distance ||
419 (from == to && distance != LOCAL_DISTANCE)) {
420 pr_warn_once("NUMA: Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
421 from, to, distance);
422 return;
423 }
424
425 numa_distance[from * numa_distance_cnt + to] = distance;
426}
427
428int __node_distance(int from, int to)
429{
430 if (from >= numa_distance_cnt || to >= numa_distance_cnt)
431 return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
432 return numa_distance[from * numa_distance_cnt + to];
433}
434EXPORT_SYMBOL(__node_distance);
435
436
437
438
439
440static bool __init numa_meminfo_cover_memory(const struct numa_meminfo *mi)
441{
442 u64 numaram, e820ram;
443 int i;
444
445 numaram = 0;
446 for (i = 0; i < mi->nr_blks; i++) {
447 u64 s = mi->blk[i].start >> PAGE_SHIFT;
448 u64 e = mi->blk[i].end >> PAGE_SHIFT;
449 numaram += e - s;
450 numaram -= __absent_pages_in_range(mi->blk[i].nid, s, e);
451 if ((s64)numaram < 0)
452 numaram = 0;
453 }
454
455 e820ram = max_pfn - absent_pages_in_range(0, max_pfn);
456
457
458 if ((s64)(e820ram - numaram) >= (1 << (20 - PAGE_SHIFT))) {
459 printk(KERN_ERR "NUMA: nodes only cover %LuMB of your %LuMB e820 RAM. Not used.\n",
460 (numaram << PAGE_SHIFT) >> 20,
461 (e820ram << PAGE_SHIFT) >> 20);
462 return false;
463 }
464 return true;
465}
466
467
468
469
470
471static void __init numa_clear_kernel_node_hotplug(void)
472{
473 nodemask_t reserved_nodemask = NODE_MASK_NONE;
474 struct memblock_region *mb_region;
475 int i;
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491 for (i = 0; i < numa_meminfo.nr_blks; i++) {
492 struct numa_memblk *mb = numa_meminfo.blk + i;
493 int ret;
494
495 ret = memblock_set_node(mb->start, mb->end - mb->start, &memblock.reserved, mb->nid);
496 WARN_ON_ONCE(ret);
497 }
498
499
500
501
502
503
504
505
506
507
508 for_each_memblock(reserved, mb_region) {
509 if (mb_region->nid != MAX_NUMNODES)
510 node_set(mb_region->nid, reserved_nodemask);
511 }
512
513
514
515
516
517
518
519
520
521 for (i = 0; i < numa_meminfo.nr_blks; i++) {
522 struct numa_memblk *mb = numa_meminfo.blk + i;
523
524 if (!node_isset(mb->nid, reserved_nodemask))
525 continue;
526
527 memblock_clear_hotplug(mb->start, mb->end - mb->start);
528 }
529}
530
531static int __init numa_register_memblks(struct numa_meminfo *mi)
532{
533 unsigned long uninitialized_var(pfn_align);
534 int i, nid;
535
536
537 node_possible_map = numa_nodes_parsed;
538 numa_nodemask_from_meminfo(&node_possible_map, mi);
539 if (WARN_ON(nodes_empty(node_possible_map)))
540 return -EINVAL;
541
542 for (i = 0; i < mi->nr_blks; i++) {
543 struct numa_memblk *mb = &mi->blk[i];
544 memblock_set_node(mb->start, mb->end - mb->start,
545 &memblock.memory, mb->nid);
546 }
547
548
549
550
551
552
553
554
555 numa_clear_kernel_node_hotplug();
556
557
558
559
560
561#ifdef NODE_NOT_IN_PAGE_FLAGS
562 pfn_align = node_map_pfn_alignment();
563 if (pfn_align && pfn_align < PAGES_PER_SECTION) {
564 printk(KERN_WARNING "Node alignment %LuMB < min %LuMB, rejecting NUMA config\n",
565 PFN_PHYS(pfn_align) >> 20,
566 PFN_PHYS(PAGES_PER_SECTION) >> 20);
567 return -EINVAL;
568 }
569#endif
570 if (!numa_meminfo_cover_memory(mi))
571 return -EINVAL;
572
573
574 for_each_node_mask(nid, node_possible_map) {
575 u64 start = PFN_PHYS(max_pfn);
576 u64 end = 0;
577
578 for (i = 0; i < mi->nr_blks; i++) {
579 if (nid != mi->blk[i].nid)
580 continue;
581 start = min(mi->blk[i].start, start);
582 end = max(mi->blk[i].end, end);
583 }
584
585 if (start >= end)
586 continue;
587
588
589
590
591
592 if (end && (end - start) < NODE_MIN_SIZE)
593 continue;
594
595 alloc_node_data(nid);
596 }
597
598
599 memblock_dump_all();
600 return 0;
601}
602
603
604
605
606
607
608
609
610static void __init numa_init_array(void)
611{
612 int rr, i;
613
614 rr = first_node(node_online_map);
615 for (i = 0; i < nr_cpu_ids; i++) {
616 if (early_cpu_to_node(i) != NUMA_NO_NODE)
617 continue;
618 numa_set_node(i, rr);
619 rr = next_node_in(rr, node_online_map);
620 }
621}
622
623static int __init numa_init(int (*init_func)(void))
624{
625 int i;
626 int ret;
627
628 for (i = 0; i < MAX_LOCAL_APIC; i++)
629 set_apicid_to_node(i, NUMA_NO_NODE);
630
631 nodes_clear(numa_nodes_parsed);
632 nodes_clear(node_possible_map);
633 nodes_clear(node_online_map);
634 memset(&numa_meminfo, 0, sizeof(numa_meminfo));
635 WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.memory,
636 MAX_NUMNODES));
637 WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.reserved,
638 MAX_NUMNODES));
639
640 WARN_ON(memblock_clear_hotplug(0, ULLONG_MAX));
641 numa_reset_distance();
642
643 ret = init_func();
644 if (ret < 0)
645 return ret;
646
647
648
649
650
651
652
653
654
655 memblock_set_bottom_up(false);
656
657 ret = numa_cleanup_meminfo(&numa_meminfo);
658 if (ret < 0)
659 return ret;
660
661 numa_emulation(&numa_meminfo, numa_distance_cnt);
662
663 ret = numa_register_memblks(&numa_meminfo);
664 if (ret < 0)
665 return ret;
666
667 for (i = 0; i < nr_cpu_ids; i++) {
668 int nid = early_cpu_to_node(i);
669
670 if (nid == NUMA_NO_NODE)
671 continue;
672 if (!node_online(nid))
673 numa_clear_node(i);
674 }
675 numa_init_array();
676
677 return 0;
678}
679
680
681
682
683
684
685
686
687
688
689static int __init dummy_numa_init(void)
690{
691 printk(KERN_INFO "%s\n",
692 numa_off ? "NUMA turned off" : "No NUMA configuration found");
693 printk(KERN_INFO "Faking a node at [mem %#018Lx-%#018Lx]\n",
694 0LLU, PFN_PHYS(max_pfn) - 1);
695
696 node_set(0, numa_nodes_parsed);
697 numa_add_memblk(0, 0, PFN_PHYS(max_pfn));
698
699 return 0;
700}
701
702
703
704
705
706
707
708
709void __init x86_numa_init(void)
710{
711 if (!numa_off) {
712#ifdef CONFIG_ACPI_NUMA
713 if (!numa_init(x86_acpi_numa_init))
714 return;
715#endif
716#ifdef CONFIG_AMD_NUMA
717 if (!numa_init(amd_numa_init))
718 return;
719#endif
720 }
721
722 numa_init(dummy_numa_init);
723}
724
725static void __init init_memory_less_node(int nid)
726{
727 unsigned long zones_size[MAX_NR_ZONES] = {0};
728 unsigned long zholes_size[MAX_NR_ZONES] = {0};
729
730
731 alloc_node_data(nid);
732 free_area_init_node(nid, zones_size, 0, zholes_size);
733
734
735
736
737
738}
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754void __init init_cpu_to_node(void)
755{
756 int cpu;
757 u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
758
759 BUG_ON(cpu_to_apicid == NULL);
760
761 for_each_possible_cpu(cpu) {
762 int node = numa_cpu_node(cpu);
763
764 if (node == NUMA_NO_NODE)
765 continue;
766
767 if (!node_online(node))
768 init_memory_less_node(node);
769
770 numa_set_node(cpu, node);
771 }
772}
773
774#ifndef CONFIG_DEBUG_PER_CPU_MAPS
775
776# ifndef CONFIG_NUMA_EMU
777void numa_add_cpu(int cpu)
778{
779 cpumask_set_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
780}
781
782void numa_remove_cpu(int cpu)
783{
784 cpumask_clear_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
785}
786# endif
787
788#else
789
790int __cpu_to_node(int cpu)
791{
792 if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
793 printk(KERN_WARNING
794 "cpu_to_node(%d): usage too early!\n", cpu);
795 dump_stack();
796 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
797 }
798 return per_cpu(x86_cpu_to_node_map, cpu);
799}
800EXPORT_SYMBOL(__cpu_to_node);
801
802
803
804
805
806int early_cpu_to_node(int cpu)
807{
808 if (early_per_cpu_ptr(x86_cpu_to_node_map))
809 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
810
811 if (!cpu_possible(cpu)) {
812 printk(KERN_WARNING
813 "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
814 dump_stack();
815 return NUMA_NO_NODE;
816 }
817 return per_cpu(x86_cpu_to_node_map, cpu);
818}
819
820void debug_cpumask_set_cpu(int cpu, int node, bool enable)
821{
822 struct cpumask *mask;
823
824 if (node == NUMA_NO_NODE) {
825
826 return;
827 }
828 mask = node_to_cpumask_map[node];
829 if (!mask) {
830 pr_err("node_to_cpumask_map[%i] NULL\n", node);
831 dump_stack();
832 return;
833 }
834
835 if (enable)
836 cpumask_set_cpu(cpu, mask);
837 else
838 cpumask_clear_cpu(cpu, mask);
839
840 printk(KERN_DEBUG "%s cpu %d node %d: mask now %*pbl\n",
841 enable ? "numa_add_cpu" : "numa_remove_cpu",
842 cpu, node, cpumask_pr_args(mask));
843 return;
844}
845
846# ifndef CONFIG_NUMA_EMU
847static void numa_set_cpumask(int cpu, bool enable)
848{
849 debug_cpumask_set_cpu(cpu, early_cpu_to_node(cpu), enable);
850}
851
852void numa_add_cpu(int cpu)
853{
854 numa_set_cpumask(cpu, true);
855}
856
857void numa_remove_cpu(int cpu)
858{
859 numa_set_cpumask(cpu, false);
860}
861# endif
862
863
864
865
866const struct cpumask *cpumask_of_node(int node)
867{
868 if (node >= nr_node_ids) {
869 printk(KERN_WARNING
870 "cpumask_of_node(%d): node > nr_node_ids(%d)\n",
871 node, nr_node_ids);
872 dump_stack();
873 return cpu_none_mask;
874 }
875 if (node_to_cpumask_map[node] == NULL) {
876 printk(KERN_WARNING
877 "cpumask_of_node(%d): no node_to_cpumask_map!\n",
878 node);
879 dump_stack();
880 return cpu_online_mask;
881 }
882 return node_to_cpumask_map[node];
883}
884EXPORT_SYMBOL(cpumask_of_node);
885
886#endif
887
888#ifdef CONFIG_MEMORY_HOTPLUG
889int memory_add_physaddr_to_nid(u64 start)
890{
891 struct numa_meminfo *mi = &numa_meminfo;
892 int nid = mi->blk[0].nid;
893 int i;
894
895 for (i = 0; i < mi->nr_blks; i++)
896 if (mi->blk[i].start <= start && mi->blk[i].end > start)
897 nid = mi->blk[i].nid;
898 return nid;
899}
900EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
901#endif
902