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>
5 #include <linux/mm.h>
6 #include <linux/of.h>
7 #include <linux/string.h>
8 #include <linux/init.h>
9 #include <linux/memblock.h>
10 #include <linux/mmzone.h>
11 #include <linux/ctype.h>
12 #include <linux/nodemask.h>
13 #include <linux/sched.h>
14 #include <linux/topology.h>
15 #include <linux/sort.h>
16
17 #include <asm/e820/api.h>
18 #include <asm/proto.h>
19 #include <asm/dma.h>
20 #include <asm/amd_nb.h>
21
22 #include "numa_internal.h"
23
24 int numa_off;
25 nodemask_t numa_nodes_parsed __initdata;
26
27 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
28 EXPORT_SYMBOL(node_data);
29
30 static struct numa_meminfo numa_meminfo __initdata_or_meminfo;
31 static struct numa_meminfo numa_reserved_meminfo __initdata_or_meminfo;
32
33 static int numa_distance_cnt;
34 static u8 *numa_distance;
35
numa_setup(char * opt)36 static __init int numa_setup(char *opt)
37 {
38 if (!opt)
39 return -EINVAL;
40 if (!strncmp(opt, "off", 3))
41 numa_off = 1;
42 if (!strncmp(opt, "fake=", 5))
43 return numa_emu_cmdline(opt + 5);
44 if (!strncmp(opt, "noacpi", 6))
45 disable_srat();
46 if (!strncmp(opt, "nohmat", 6))
47 disable_hmat();
48 return 0;
49 }
50 early_param("numa", numa_setup);
51
52 /*
53 * apicid, cpu, node mappings
54 */
55 s16 __apicid_to_node[MAX_LOCAL_APIC] = {
56 [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
57 };
58
numa_cpu_node(int cpu)59 int numa_cpu_node(int cpu)
60 {
61 u32 apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
62
63 if (apicid != BAD_APICID)
64 return __apicid_to_node[apicid];
65 return NUMA_NO_NODE;
66 }
67
68 cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
69 EXPORT_SYMBOL(node_to_cpumask_map);
70
71 /*
72 * Map cpu index to node index
73 */
74 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
75 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
76
numa_set_node(int cpu,int node)77 void numa_set_node(int cpu, int node)
78 {
79 int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
80
81 /* early setting, no percpu area yet */
82 if (cpu_to_node_map) {
83 cpu_to_node_map[cpu] = node;
84 return;
85 }
86
87 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
88 if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) {
89 printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu);
90 dump_stack();
91 return;
92 }
93 #endif
94 per_cpu(x86_cpu_to_node_map, cpu) = node;
95
96 set_cpu_numa_node(cpu, node);
97 }
98
numa_clear_node(int cpu)99 void numa_clear_node(int cpu)
100 {
101 numa_set_node(cpu, NUMA_NO_NODE);
102 }
103
104 /*
105 * Allocate node_to_cpumask_map based on number of available nodes
106 * Requires node_possible_map to be valid.
107 *
108 * Note: cpumask_of_node() is not valid until after this is done.
109 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
110 */
setup_node_to_cpumask_map(void)111 void __init setup_node_to_cpumask_map(void)
112 {
113 unsigned int node;
114
115 /* setup nr_node_ids if not done yet */
116 if (nr_node_ids == MAX_NUMNODES)
117 setup_nr_node_ids();
118
119 /* allocate the map */
120 for (node = 0; node < nr_node_ids; node++)
121 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
122
123 /* cpumask_of_node() will now work */
124 pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
125 }
126
numa_add_memblk_to(int nid,u64 start,u64 end,struct numa_meminfo * mi)127 static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
128 struct numa_meminfo *mi)
129 {
130 /* ignore zero length blks */
131 if (start == end)
132 return 0;
133
134 /* whine about and ignore invalid blks */
135 if (start > end || nid < 0 || nid >= MAX_NUMNODES) {
136 pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
137 nid, start, end - 1);
138 return 0;
139 }
140
141 if (mi->nr_blks >= NR_NODE_MEMBLKS) {
142 pr_err("too many memblk ranges\n");
143 return -EINVAL;
144 }
145
146 mi->blk[mi->nr_blks].start = start;
147 mi->blk[mi->nr_blks].end = end;
148 mi->blk[mi->nr_blks].nid = nid;
149 mi->nr_blks++;
150 return 0;
151 }
152
153 /**
154 * numa_remove_memblk_from - Remove one numa_memblk from a numa_meminfo
155 * @idx: Index of memblk to remove
156 * @mi: numa_meminfo to remove memblk from
157 *
158 * Remove @idx'th numa_memblk from @mi by shifting @mi->blk[] and
159 * decrementing @mi->nr_blks.
160 */
numa_remove_memblk_from(int idx,struct numa_meminfo * mi)161 void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi)
162 {
163 mi->nr_blks--;
164 memmove(&mi->blk[idx], &mi->blk[idx + 1],
165 (mi->nr_blks - idx) * sizeof(mi->blk[0]));
166 }
167
168 /**
169 * numa_move_tail_memblk - Move a numa_memblk from one numa_meminfo to another
170 * @dst: numa_meminfo to append block to
171 * @idx: Index of memblk to remove
172 * @src: numa_meminfo to remove memblk from
173 */
numa_move_tail_memblk(struct numa_meminfo * dst,int idx,struct numa_meminfo * src)174 static void __init numa_move_tail_memblk(struct numa_meminfo *dst, int idx,
175 struct numa_meminfo *src)
176 {
177 dst->blk[dst->nr_blks++] = src->blk[idx];
178 numa_remove_memblk_from(idx, src);
179 }
180
181 /**
182 * numa_add_memblk - Add one numa_memblk to numa_meminfo
183 * @nid: NUMA node ID of the new memblk
184 * @start: Start address of the new memblk
185 * @end: End address of the new memblk
186 *
187 * Add a new memblk to the default numa_meminfo.
188 *
189 * RETURNS:
190 * 0 on success, -errno on failure.
191 */
numa_add_memblk(int nid,u64 start,u64 end)192 int __init numa_add_memblk(int nid, u64 start, u64 end)
193 {
194 return numa_add_memblk_to(nid, start, end, &numa_meminfo);
195 }
196
197 /* Allocate NODE_DATA for a node on the local memory */
alloc_node_data(int nid)198 static void __init alloc_node_data(int nid)
199 {
200 const size_t nd_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
201 u64 nd_pa;
202 void *nd;
203 int tnid;
204
205 /*
206 * Allocate node data. Try node-local memory and then any node.
207 * Never allocate in DMA zone.
208 */
209 nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
210 if (!nd_pa) {
211 pr_err("Cannot find %zu bytes in any node (initial node: %d)\n",
212 nd_size, nid);
213 return;
214 }
215 nd = __va(nd_pa);
216
217 /* report and initialize */
218 printk(KERN_INFO "NODE_DATA(%d) allocated [mem %#010Lx-%#010Lx]\n", nid,
219 nd_pa, nd_pa + nd_size - 1);
220 tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
221 if (tnid != nid)
222 printk(KERN_INFO " NODE_DATA(%d) on node %d\n", nid, tnid);
223
224 node_data[nid] = nd;
225 memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
226
227 node_set_online(nid);
228 }
229
230 /**
231 * numa_cleanup_meminfo - Cleanup a numa_meminfo
232 * @mi: numa_meminfo to clean up
233 *
234 * Sanitize @mi by merging and removing unnecessary memblks. Also check for
235 * conflicts and clear unused memblks.
236 *
237 * RETURNS:
238 * 0 on success, -errno on failure.
239 */
numa_cleanup_meminfo(struct numa_meminfo * mi)240 int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
241 {
242 const u64 low = 0;
243 const u64 high = PFN_PHYS(max_pfn);
244 int i, j, k;
245
246 /* first, trim all entries */
247 for (i = 0; i < mi->nr_blks; i++) {
248 struct numa_memblk *bi = &mi->blk[i];
249
250 /* move / save reserved memory ranges */
251 if (!memblock_overlaps_region(&memblock.memory,
252 bi->start, bi->end - bi->start)) {
253 numa_move_tail_memblk(&numa_reserved_meminfo, i--, mi);
254 continue;
255 }
256
257 /* make sure all non-reserved blocks are inside the limits */
258 bi->start = max(bi->start, low);
259
260 /* preserve info for non-RAM areas above 'max_pfn': */
261 if (bi->end > high) {
262 numa_add_memblk_to(bi->nid, high, bi->end,
263 &numa_reserved_meminfo);
264 bi->end = high;
265 }
266
267 /* and there's no empty block */
268 if (bi->start >= bi->end)
269 numa_remove_memblk_from(i--, mi);
270 }
271
272 /* merge neighboring / overlapping entries */
273 for (i = 0; i < mi->nr_blks; i++) {
274 struct numa_memblk *bi = &mi->blk[i];
275
276 for (j = i + 1; j < mi->nr_blks; j++) {
277 struct numa_memblk *bj = &mi->blk[j];
278 u64 start, end;
279
280 /*
281 * See whether there are overlapping blocks. Whine
282 * about but allow overlaps of the same nid. They
283 * will be merged below.
284 */
285 if (bi->end > bj->start && bi->start < bj->end) {
286 if (bi->nid != bj->nid) {
287 pr_err("node %d [mem %#010Lx-%#010Lx] overlaps with node %d [mem %#010Lx-%#010Lx]\n",
288 bi->nid, bi->start, bi->end - 1,
289 bj->nid, bj->start, bj->end - 1);
290 return -EINVAL;
291 }
292 pr_warn("Warning: node %d [mem %#010Lx-%#010Lx] overlaps with itself [mem %#010Lx-%#010Lx]\n",
293 bi->nid, bi->start, bi->end - 1,
294 bj->start, bj->end - 1);
295 }
296
297 /*
298 * Join together blocks on the same node, holes
299 * between which don't overlap with memory on other
300 * nodes.
301 */
302 if (bi->nid != bj->nid)
303 continue;
304 start = min(bi->start, bj->start);
305 end = max(bi->end, bj->end);
306 for (k = 0; k < mi->nr_blks; k++) {
307 struct numa_memblk *bk = &mi->blk[k];
308
309 if (bi->nid == bk->nid)
310 continue;
311 if (start < bk->end && end > bk->start)
312 break;
313 }
314 if (k < mi->nr_blks)
315 continue;
316 printk(KERN_INFO "NUMA: Node %d [mem %#010Lx-%#010Lx] + [mem %#010Lx-%#010Lx] -> [mem %#010Lx-%#010Lx]\n",
317 bi->nid, bi->start, bi->end - 1, bj->start,
318 bj->end - 1, start, end - 1);
319 bi->start = start;
320 bi->end = end;
321 numa_remove_memblk_from(j--, mi);
322 }
323 }
324
325 /* clear unused ones */
326 for (i = mi->nr_blks; i < ARRAY_SIZE(mi->blk); i++) {
327 mi->blk[i].start = mi->blk[i].end = 0;
328 mi->blk[i].nid = NUMA_NO_NODE;
329 }
330
331 return 0;
332 }
333
334 /*
335 * Set nodes, which have memory in @mi, in *@nodemask.
336 */
numa_nodemask_from_meminfo(nodemask_t * nodemask,const struct numa_meminfo * mi)337 static void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
338 const struct numa_meminfo *mi)
339 {
340 int i;
341
342 for (i = 0; i < ARRAY_SIZE(mi->blk); i++)
343 if (mi->blk[i].start != mi->blk[i].end &&
344 mi->blk[i].nid != NUMA_NO_NODE)
345 node_set(mi->blk[i].nid, *nodemask);
346 }
347
348 /**
349 * numa_reset_distance - Reset NUMA distance table
350 *
351 * The current table is freed. The next numa_set_distance() call will
352 * create a new one.
353 */
numa_reset_distance(void)354 void __init numa_reset_distance(void)
355 {
356 size_t size = numa_distance_cnt * numa_distance_cnt * sizeof(numa_distance[0]);
357
358 /* numa_distance could be 1LU marking allocation failure, test cnt */
359 if (numa_distance_cnt)
360 memblock_free(numa_distance, size);
361 numa_distance_cnt = 0;
362 numa_distance = NULL; /* enable table creation */
363 }
364
numa_alloc_distance(void)365 static int __init numa_alloc_distance(void)
366 {
367 nodemask_t nodes_parsed;
368 size_t size;
369 int i, j, cnt = 0;
370 u64 phys;
371
372 /* size the new table and allocate it */
373 nodes_parsed = numa_nodes_parsed;
374 numa_nodemask_from_meminfo(&nodes_parsed, &numa_meminfo);
375
376 for_each_node_mask(i, nodes_parsed)
377 cnt = i;
378 cnt++;
379 size = cnt * cnt * sizeof(numa_distance[0]);
380
381 phys = memblock_phys_alloc_range(size, PAGE_SIZE, 0,
382 PFN_PHYS(max_pfn_mapped));
383 if (!phys) {
384 pr_warn("Warning: can't allocate distance table!\n");
385 /* don't retry until explicitly reset */
386 numa_distance = (void *)1LU;
387 return -ENOMEM;
388 }
389
390 numa_distance = __va(phys);
391 numa_distance_cnt = cnt;
392
393 /* fill with the default distances */
394 for (i = 0; i < cnt; i++)
395 for (j = 0; j < cnt; j++)
396 numa_distance[i * cnt + j] = i == j ?
397 LOCAL_DISTANCE : REMOTE_DISTANCE;
398 printk(KERN_DEBUG "NUMA: Initialized distance table, cnt=%d\n", cnt);
399
400 return 0;
401 }
402
403 /**
404 * numa_set_distance - Set NUMA distance from one NUMA to another
405 * @from: the 'from' node to set distance
406 * @to: the 'to' node to set distance
407 * @distance: NUMA distance
408 *
409 * Set the distance from node @from to @to to @distance. If distance table
410 * doesn't exist, one which is large enough to accommodate all the currently
411 * known nodes will be created.
412 *
413 * If such table cannot be allocated, a warning is printed and further
414 * calls are ignored until the distance table is reset with
415 * numa_reset_distance().
416 *
417 * If @from or @to is higher than the highest known node or lower than zero
418 * at the time of table creation or @distance doesn't make sense, the call
419 * is ignored.
420 * This is to allow simplification of specific NUMA config implementations.
421 */
numa_set_distance(int from,int to,int distance)422 void __init numa_set_distance(int from, int to, int distance)
423 {
424 if (!numa_distance && numa_alloc_distance() < 0)
425 return;
426
427 if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
428 from < 0 || to < 0) {
429 pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
430 from, to, distance);
431 return;
432 }
433
434 if ((u8)distance != distance ||
435 (from == to && distance != LOCAL_DISTANCE)) {
436 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
437 from, to, distance);
438 return;
439 }
440
441 numa_distance[from * numa_distance_cnt + to] = distance;
442 }
443
__node_distance(int from,int to)444 int __node_distance(int from, int to)
445 {
446 if (from >= numa_distance_cnt || to >= numa_distance_cnt)
447 return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
448 return numa_distance[from * numa_distance_cnt + to];
449 }
450 EXPORT_SYMBOL(__node_distance);
451
452 /*
453 * Mark all currently memblock-reserved physical memory (which covers the
454 * kernel's own memory ranges) as hot-unswappable.
455 */
numa_clear_kernel_node_hotplug(void)456 static void __init numa_clear_kernel_node_hotplug(void)
457 {
458 nodemask_t reserved_nodemask = NODE_MASK_NONE;
459 struct memblock_region *mb_region;
460 int i;
461
462 /*
463 * We have to do some preprocessing of memblock regions, to
464 * make them suitable for reservation.
465 *
466 * At this time, all memory regions reserved by memblock are
467 * used by the kernel, but those regions are not split up
468 * along node boundaries yet, and don't necessarily have their
469 * node ID set yet either.
470 *
471 * So iterate over all memory known to the x86 architecture,
472 * and use those ranges to set the nid in memblock.reserved.
473 * This will split up the memblock regions along node
474 * boundaries and will set the node IDs as well.
475 */
476 for (i = 0; i < numa_meminfo.nr_blks; i++) {
477 struct numa_memblk *mb = numa_meminfo.blk + i;
478 int ret;
479
480 ret = memblock_set_node(mb->start, mb->end - mb->start, &memblock.reserved, mb->nid);
481 WARN_ON_ONCE(ret);
482 }
483
484 /*
485 * Now go over all reserved memblock regions, to construct a
486 * node mask of all kernel reserved memory areas.
487 *
488 * [ Note, when booting with mem=nn[kMG] or in a kdump kernel,
489 * numa_meminfo might not include all memblock.reserved
490 * memory ranges, because quirks such as trim_snb_memory()
491 * reserve specific pages for Sandy Bridge graphics. ]
492 */
493 for_each_reserved_mem_region(mb_region) {
494 int nid = memblock_get_region_node(mb_region);
495
496 if (nid != MAX_NUMNODES)
497 node_set(nid, reserved_nodemask);
498 }
499
500 /*
501 * Finally, clear the MEMBLOCK_HOTPLUG flag for all memory
502 * belonging to the reserved node mask.
503 *
504 * Note that this will include memory regions that reside
505 * on nodes that contain kernel memory - entire nodes
506 * become hot-unpluggable:
507 */
508 for (i = 0; i < numa_meminfo.nr_blks; i++) {
509 struct numa_memblk *mb = numa_meminfo.blk + i;
510
511 if (!node_isset(mb->nid, reserved_nodemask))
512 continue;
513
514 memblock_clear_hotplug(mb->start, mb->end - mb->start);
515 }
516 }
517
numa_register_memblks(struct numa_meminfo * mi)518 static int __init numa_register_memblks(struct numa_meminfo *mi)
519 {
520 int i, nid;
521
522 /* Account for nodes with cpus and no memory */
523 node_possible_map = numa_nodes_parsed;
524 numa_nodemask_from_meminfo(&node_possible_map, mi);
525 if (WARN_ON(nodes_empty(node_possible_map)))
526 return -EINVAL;
527
528 for (i = 0; i < mi->nr_blks; i++) {
529 struct numa_memblk *mb = &mi->blk[i];
530 memblock_set_node(mb->start, mb->end - mb->start,
531 &memblock.memory, mb->nid);
532 }
533
534 /*
535 * At very early time, the kernel have to use some memory such as
536 * loading the kernel image. We cannot prevent this anyway. So any
537 * node the kernel resides in should be un-hotpluggable.
538 *
539 * And when we come here, alloc node data won't fail.
540 */
541 numa_clear_kernel_node_hotplug();
542
543 /*
544 * If sections array is gonna be used for pfn -> nid mapping, check
545 * whether its granularity is fine enough.
546 */
547 if (IS_ENABLED(NODE_NOT_IN_PAGE_FLAGS)) {
548 unsigned long pfn_align = node_map_pfn_alignment();
549
550 if (pfn_align && pfn_align < PAGES_PER_SECTION) {
551 pr_warn("Node alignment %LuMB < min %LuMB, rejecting NUMA config\n",
552 PFN_PHYS(pfn_align) >> 20,
553 PFN_PHYS(PAGES_PER_SECTION) >> 20);
554 return -EINVAL;
555 }
556 }
557
558 if (!memblock_validate_numa_coverage(SZ_1M))
559 return -EINVAL;
560
561 /* Finally register nodes. */
562 for_each_node_mask(nid, node_possible_map) {
563 u64 start = PFN_PHYS(max_pfn);
564 u64 end = 0;
565
566 for (i = 0; i < mi->nr_blks; i++) {
567 if (nid != mi->blk[i].nid)
568 continue;
569 start = min(mi->blk[i].start, start);
570 end = max(mi->blk[i].end, end);
571 }
572
573 if (start >= end)
574 continue;
575
576 alloc_node_data(nid);
577 }
578
579 /* Dump memblock with node info and return. */
580 memblock_dump_all();
581 return 0;
582 }
583
584 /*
585 * There are unfortunately some poorly designed mainboards around that
586 * only connect memory to a single CPU. This breaks the 1:1 cpu->node
587 * mapping. To avoid this fill in the mapping for all possible CPUs,
588 * as the number of CPUs is not known yet. We round robin the existing
589 * nodes.
590 */
numa_init_array(void)591 static void __init numa_init_array(void)
592 {
593 int rr, i;
594
595 rr = first_node(node_online_map);
596 for (i = 0; i < nr_cpu_ids; i++) {
597 if (early_cpu_to_node(i) != NUMA_NO_NODE)
598 continue;
599 numa_set_node(i, rr);
600 rr = next_node_in(rr, node_online_map);
601 }
602 }
603
numa_init(int (* init_func)(void))604 static int __init numa_init(int (*init_func)(void))
605 {
606 int i;
607 int ret;
608
609 for (i = 0; i < MAX_LOCAL_APIC; i++)
610 set_apicid_to_node(i, NUMA_NO_NODE);
611
612 nodes_clear(numa_nodes_parsed);
613 nodes_clear(node_possible_map);
614 nodes_clear(node_online_map);
615 memset(&numa_meminfo, 0, sizeof(numa_meminfo));
616 WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.memory,
617 MAX_NUMNODES));
618 WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.reserved,
619 MAX_NUMNODES));
620 /* In case that parsing SRAT failed. */
621 WARN_ON(memblock_clear_hotplug(0, ULLONG_MAX));
622 numa_reset_distance();
623
624 ret = init_func();
625 if (ret < 0)
626 return ret;
627
628 /*
629 * We reset memblock back to the top-down direction
630 * here because if we configured ACPI_NUMA, we have
631 * parsed SRAT in init_func(). It is ok to have the
632 * reset here even if we did't configure ACPI_NUMA
633 * or acpi numa init fails and fallbacks to dummy
634 * numa init.
635 */
636 memblock_set_bottom_up(false);
637
638 ret = numa_cleanup_meminfo(&numa_meminfo);
639 if (ret < 0)
640 return ret;
641
642 numa_emulation(&numa_meminfo, numa_distance_cnt);
643
644 ret = numa_register_memblks(&numa_meminfo);
645 if (ret < 0)
646 return ret;
647
648 for (i = 0; i < nr_cpu_ids; i++) {
649 int nid = early_cpu_to_node(i);
650
651 if (nid == NUMA_NO_NODE)
652 continue;
653 if (!node_online(nid))
654 numa_clear_node(i);
655 }
656 numa_init_array();
657
658 return 0;
659 }
660
661 /**
662 * dummy_numa_init - Fallback dummy NUMA init
663 *
664 * Used if there's no underlying NUMA architecture, NUMA initialization
665 * fails, or NUMA is disabled on the command line.
666 *
667 * Must online at least one node and add memory blocks that cover all
668 * allowed memory. This function must not fail.
669 */
dummy_numa_init(void)670 static int __init dummy_numa_init(void)
671 {
672 printk(KERN_INFO "%s\n",
673 numa_off ? "NUMA turned off" : "No NUMA configuration found");
674 printk(KERN_INFO "Faking a node at [mem %#018Lx-%#018Lx]\n",
675 0LLU, PFN_PHYS(max_pfn) - 1);
676
677 node_set(0, numa_nodes_parsed);
678 numa_add_memblk(0, 0, PFN_PHYS(max_pfn));
679
680 return 0;
681 }
682
683 /**
684 * x86_numa_init - Initialize NUMA
685 *
686 * Try each configured NUMA initialization method until one succeeds. The
687 * last fallback is dummy single node config encompassing whole memory and
688 * never fails.
689 */
x86_numa_init(void)690 void __init x86_numa_init(void)
691 {
692 if (!numa_off) {
693 #ifdef CONFIG_ACPI_NUMA
694 if (!numa_init(x86_acpi_numa_init))
695 return;
696 #endif
697 #ifdef CONFIG_AMD_NUMA
698 if (!numa_init(amd_numa_init))
699 return;
700 #endif
701 if (acpi_disabled && !numa_init(of_numa_init))
702 return;
703 }
704
705 numa_init(dummy_numa_init);
706 }
707
708
709 /*
710 * A node may exist which has one or more Generic Initiators but no CPUs and no
711 * memory.
712 *
713 * This function must be called after init_cpu_to_node(), to ensure that any
714 * memoryless CPU nodes have already been brought online, and before the
715 * node_data[nid] is needed for zone list setup in build_all_zonelists().
716 *
717 * When this function is called, any nodes containing either memory and/or CPUs
718 * will already be online and there is no need to do anything extra, even if
719 * they also contain one or more Generic Initiators.
720 */
init_gi_nodes(void)721 void __init init_gi_nodes(void)
722 {
723 int nid;
724
725 /*
726 * Exclude this node from
727 * bringup_nonboot_cpus
728 * cpu_up
729 * __try_online_node
730 * register_one_node
731 * because node_subsys is not initialized yet.
732 * TODO remove dependency on node_online
733 */
734 for_each_node_state(nid, N_GENERIC_INITIATOR)
735 if (!node_online(nid))
736 node_set_online(nid);
737 }
738
739 /*
740 * Setup early cpu_to_node.
741 *
742 * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
743 * and apicid_to_node[] tables have valid entries for a CPU.
744 * This means we skip cpu_to_node[] initialisation for NUMA
745 * emulation and faking node case (when running a kernel compiled
746 * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
747 * is already initialized in a round robin manner at numa_init_array,
748 * prior to this call, and this initialization is good enough
749 * for the fake NUMA cases.
750 *
751 * Called before the per_cpu areas are setup.
752 */
init_cpu_to_node(void)753 void __init init_cpu_to_node(void)
754 {
755 int cpu;
756 u32 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
757
758 BUG_ON(cpu_to_apicid == NULL);
759
760 for_each_possible_cpu(cpu) {
761 int node = numa_cpu_node(cpu);
762
763 if (node == NUMA_NO_NODE)
764 continue;
765
766 /*
767 * Exclude this node from
768 * bringup_nonboot_cpus
769 * cpu_up
770 * __try_online_node
771 * register_one_node
772 * because node_subsys is not initialized yet.
773 * TODO remove dependency on node_online
774 */
775 if (!node_online(node))
776 node_set_online(node);
777
778 numa_set_node(cpu, node);
779 }
780 }
781
782 #ifndef CONFIG_DEBUG_PER_CPU_MAPS
783
784 # ifndef CONFIG_NUMA_EMU
numa_add_cpu(int cpu)785 void numa_add_cpu(int cpu)
786 {
787 cpumask_set_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
788 }
789
numa_remove_cpu(int cpu)790 void numa_remove_cpu(int cpu)
791 {
792 cpumask_clear_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
793 }
794 # endif /* !CONFIG_NUMA_EMU */
795
796 #else /* !CONFIG_DEBUG_PER_CPU_MAPS */
797
__cpu_to_node(int cpu)798 int __cpu_to_node(int cpu)
799 {
800 if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
801 printk(KERN_WARNING
802 "cpu_to_node(%d): usage too early!\n", cpu);
803 dump_stack();
804 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
805 }
806 return per_cpu(x86_cpu_to_node_map, cpu);
807 }
808 EXPORT_SYMBOL(__cpu_to_node);
809
810 /*
811 * Same function as cpu_to_node() but used if called before the
812 * per_cpu areas are setup.
813 */
early_cpu_to_node(int cpu)814 int early_cpu_to_node(int cpu)
815 {
816 if (early_per_cpu_ptr(x86_cpu_to_node_map))
817 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
818
819 if (!cpu_possible(cpu)) {
820 printk(KERN_WARNING
821 "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
822 dump_stack();
823 return NUMA_NO_NODE;
824 }
825 return per_cpu(x86_cpu_to_node_map, cpu);
826 }
827
debug_cpumask_set_cpu(int cpu,int node,bool enable)828 void debug_cpumask_set_cpu(int cpu, int node, bool enable)
829 {
830 struct cpumask *mask;
831
832 if (node == NUMA_NO_NODE) {
833 /* early_cpu_to_node() already emits a warning and trace */
834 return;
835 }
836 mask = node_to_cpumask_map[node];
837 if (!cpumask_available(mask)) {
838 pr_err("node_to_cpumask_map[%i] NULL\n", node);
839 dump_stack();
840 return;
841 }
842
843 if (enable)
844 cpumask_set_cpu(cpu, mask);
845 else
846 cpumask_clear_cpu(cpu, mask);
847
848 printk(KERN_DEBUG "%s cpu %d node %d: mask now %*pbl\n",
849 enable ? "numa_add_cpu" : "numa_remove_cpu",
850 cpu, node, cpumask_pr_args(mask));
851 return;
852 }
853
854 # ifndef CONFIG_NUMA_EMU
numa_set_cpumask(int cpu,bool enable)855 static void numa_set_cpumask(int cpu, bool enable)
856 {
857 debug_cpumask_set_cpu(cpu, early_cpu_to_node(cpu), enable);
858 }
859
numa_add_cpu(int cpu)860 void numa_add_cpu(int cpu)
861 {
862 numa_set_cpumask(cpu, true);
863 }
864
numa_remove_cpu(int cpu)865 void numa_remove_cpu(int cpu)
866 {
867 numa_set_cpumask(cpu, false);
868 }
869 # endif /* !CONFIG_NUMA_EMU */
870
871 /*
872 * Returns a pointer to the bitmask of CPUs on Node 'node'.
873 */
cpumask_of_node(int node)874 const struct cpumask *cpumask_of_node(int node)
875 {
876 if ((unsigned)node >= nr_node_ids) {
877 printk(KERN_WARNING
878 "cpumask_of_node(%d): (unsigned)node >= nr_node_ids(%u)\n",
879 node, nr_node_ids);
880 dump_stack();
881 return cpu_none_mask;
882 }
883 if (!cpumask_available(node_to_cpumask_map[node])) {
884 printk(KERN_WARNING
885 "cpumask_of_node(%d): no node_to_cpumask_map!\n",
886 node);
887 dump_stack();
888 return cpu_online_mask;
889 }
890 return node_to_cpumask_map[node];
891 }
892 EXPORT_SYMBOL(cpumask_of_node);
893
894 #endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
895
896 #ifdef CONFIG_NUMA_KEEP_MEMINFO
meminfo_to_nid(struct numa_meminfo * mi,u64 start)897 static int meminfo_to_nid(struct numa_meminfo *mi, u64 start)
898 {
899 int i;
900
901 for (i = 0; i < mi->nr_blks; i++)
902 if (mi->blk[i].start <= start && mi->blk[i].end > start)
903 return mi->blk[i].nid;
904 return NUMA_NO_NODE;
905 }
906
phys_to_target_node(phys_addr_t start)907 int phys_to_target_node(phys_addr_t start)
908 {
909 int nid = meminfo_to_nid(&numa_meminfo, start);
910
911 /*
912 * Prefer online nodes, but if reserved memory might be
913 * hot-added continue the search with reserved ranges.
914 */
915 if (nid != NUMA_NO_NODE)
916 return nid;
917
918 return meminfo_to_nid(&numa_reserved_meminfo, start);
919 }
920 EXPORT_SYMBOL_GPL(phys_to_target_node);
921
memory_add_physaddr_to_nid(u64 start)922 int memory_add_physaddr_to_nid(u64 start)
923 {
924 int nid = meminfo_to_nid(&numa_meminfo, start);
925
926 if (nid == NUMA_NO_NODE)
927 nid = numa_meminfo.blk[0].nid;
928 return nid;
929 }
930 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
931
932 #endif
933
cmp_memblk(const void * a,const void * b)934 static int __init cmp_memblk(const void *a, const void *b)
935 {
936 const struct numa_memblk *ma = *(const struct numa_memblk **)a;
937 const struct numa_memblk *mb = *(const struct numa_memblk **)b;
938
939 return (ma->start > mb->start) - (ma->start < mb->start);
940 }
941
942 static struct numa_memblk *numa_memblk_list[NR_NODE_MEMBLKS] __initdata;
943
944 /**
945 * numa_fill_memblks - Fill gaps in numa_meminfo memblks
946 * @start: address to begin fill
947 * @end: address to end fill
948 *
949 * Find and extend numa_meminfo memblks to cover the physical
950 * address range @start-@end
951 *
952 * RETURNS:
953 * 0 : Success
954 * NUMA_NO_MEMBLK : No memblks exist in address range @start-@end
955 */
956
numa_fill_memblks(u64 start,u64 end)957 int __init numa_fill_memblks(u64 start, u64 end)
958 {
959 struct numa_memblk **blk = &numa_memblk_list[0];
960 struct numa_meminfo *mi = &numa_meminfo;
961 int count = 0;
962 u64 prev_end;
963
964 /*
965 * Create a list of pointers to numa_meminfo memblks that
966 * overlap start, end. The list is used to make in-place
967 * changes that fill out the numa_meminfo memblks.
968 */
969 for (int i = 0; i < mi->nr_blks; i++) {
970 struct numa_memblk *bi = &mi->blk[i];
971
972 if (memblock_addrs_overlap(start, end - start, bi->start,
973 bi->end - bi->start)) {
974 blk[count] = &mi->blk[i];
975 count++;
976 }
977 }
978 if (!count)
979 return NUMA_NO_MEMBLK;
980
981 /* Sort the list of pointers in memblk->start order */
982 sort(&blk[0], count, sizeof(blk[0]), cmp_memblk, NULL);
983
984 /* Make sure the first/last memblks include start/end */
985 blk[0]->start = min(blk[0]->start, start);
986 blk[count - 1]->end = max(blk[count - 1]->end, end);
987
988 /*
989 * Fill any gaps by tracking the previous memblks
990 * end address and backfilling to it if needed.
991 */
992 prev_end = blk[0]->end;
993 for (int i = 1; i < count; i++) {
994 struct numa_memblk *curr = blk[i];
995
996 if (prev_end >= curr->start) {
997 if (prev_end < curr->end)
998 prev_end = curr->end;
999 } else {
1000 curr->start = prev_end;
1001 prev_end = curr->end;
1002 }
1003 }
1004 return 0;
1005 }
1006