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Thomas Gleixnercaab2772019-06-03 07:44:50 +02001// SPDX-License-Identifier: GPL-2.0-only
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -07002/*
3 * NUMA support, based on the x86 implementation.
4 *
5 * Copyright (C) 2015 Cavium Inc.
6 * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -07007 */
8
Kefeng Wangf11c7ba2016-09-01 14:54:59 +08009#define pr_fmt(fmt) "NUMA: " fmt
10
Hanjun Guod8b47fc2016-05-24 15:35:44 -070011#include <linux/acpi.h>
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -070012#include <linux/memblock.h>
13#include <linux/module.h>
14#include <linux/of.h>
15
Zhen Lei7af3a0a2016-09-01 14:55:00 +080016#include <asm/sections.h>
Kefeng Wang09cea612021-11-05 13:39:44 -070017#include <asm/pgalloc.h>
Catalin Marinasbfe6c8a2016-08-15 16:33:10 +010018
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -070019struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
20EXPORT_SYMBOL(node_data);
21nodemask_t numa_nodes_parsed __initdata;
22static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
23
24static int numa_distance_cnt;
25static u8 *numa_distance;
Boris Ostrovskyaec03f82016-12-12 23:18:29 -050026bool numa_off;
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -070027
28static __init int numa_parse_early_param(char *opt)
29{
30 if (!opt)
31 return -EINVAL;
Chuhong Yuanb3e089c2019-07-30 10:44:15 +080032 if (str_has_prefix(opt, "off"))
David Daney34c33372016-05-24 15:35:37 -070033 numa_off = true;
Kefeng Wangf11c7ba2016-09-01 14:54:59 +080034
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -070035 return 0;
36}
37early_param("numa", numa_parse_early_param);
38
39cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
40EXPORT_SYMBOL(node_to_cpumask_map);
41
42#ifdef CONFIG_DEBUG_PER_CPU_MAPS
43
44/*
45 * Returns a pointer to the bitmask of CPUs on Node 'node'.
46 */
47const struct cpumask *cpumask_of_node(int node)
48{
Zhengyuan Liua194c5f2020-09-21 10:39:36 +080049
50 if (node == NUMA_NO_NODE)
51 return cpu_all_mask;
52
53 if (WARN_ON(node < 0 || node >= nr_node_ids))
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -070054 return cpu_none_mask;
55
56 if (WARN_ON(node_to_cpumask_map[node] == NULL))
57 return cpu_online_mask;
58
59 return node_to_cpumask_map[node];
60}
61EXPORT_SYMBOL(cpumask_of_node);
62
63#endif
64
Sudeep Holla97fd6012018-07-06 12:02:43 +010065static void numa_update_cpu(unsigned int cpu, bool remove)
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -070066{
Sudeep Holla97fd6012018-07-06 12:02:43 +010067 int nid = cpu_to_node(cpu);
68
69 if (nid == NUMA_NO_NODE)
70 return;
71
72 if (remove)
73 cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
74 else
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -070075 cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
76}
77
Sudeep Holla97fd6012018-07-06 12:02:43 +010078void numa_add_cpu(unsigned int cpu)
79{
80 numa_update_cpu(cpu, false);
81}
82
83void numa_remove_cpu(unsigned int cpu)
84{
85 numa_update_cpu(cpu, true);
86}
87
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -070088void numa_clear_node(unsigned int cpu)
89{
Sudeep Holla97fd6012018-07-06 12:02:43 +010090 numa_remove_cpu(cpu);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -070091 set_cpu_numa_node(cpu, NUMA_NO_NODE);
92}
93
94/*
95 * Allocate node_to_cpumask_map based on number of available nodes
96 * Requires node_possible_map to be valid.
97 *
98 * Note: cpumask_of_node() is not valid until after this is done.
99 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
100 */
101static void __init setup_node_to_cpumask_map(void)
102{
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700103 int node;
104
105 /* setup nr_node_ids if not done yet */
106 if (nr_node_ids == MAX_NUMNODES)
107 setup_nr_node_ids();
108
109 /* allocate and clear the mapping */
110 for (node = 0; node < nr_node_ids; node++) {
111 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
112 cpumask_clear(node_to_cpumask_map[node]);
113 }
114
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700115 /* cpumask_of_node() will now work */
Alexey Dobriyanb9726c22019-03-05 15:48:26 -0800116 pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700117}
118
119/*
Qian Caib1ce45e2019-03-14 12:16:19 -0400120 * Set the cpu to node and mem mapping
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700121 */
122void numa_store_cpu_info(unsigned int cpu)
123{
Sudeep Holla97fd6012018-07-06 12:02:43 +0100124 set_cpu_numa_node(cpu, cpu_to_node_map[cpu]);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700125}
126
127void __init early_map_cpu_to_node(unsigned int cpu, int nid)
128{
129 /* fallback to node 0 */
Zhen Lei7ba5f602016-09-01 14:55:04 +0800130 if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700131 nid = 0;
132
133 cpu_to_node_map[cpu] = nid;
Zhen Lei7ba5f602016-09-01 14:55:04 +0800134
135 /*
136 * We should set the numa node of cpu0 as soon as possible, because it
137 * has already been set up online before. cpu_to_node(0) will soon be
138 * called.
139 */
140 if (!cpu)
141 set_cpu_numa_node(cpu, nid);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700142}
143
Zhen Lei7af3a0a2016-09-01 14:55:00 +0800144#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
145unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
146EXPORT_SYMBOL(__per_cpu_offset);
147
148static int __init early_cpu_to_node(int cpu)
149{
150 return cpu_to_node_map[cpu];
151}
152
153static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
154{
Yisheng Xie26984c32016-10-21 16:13:55 +0800155 return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
Zhen Lei7af3a0a2016-09-01 14:55:00 +0800156}
157
158static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size,
159 size_t align)
160{
161 int nid = early_cpu_to_node(cpu);
162
Mike Rapoporteb31d552018-10-30 15:08:04 -0700163 return memblock_alloc_try_nid(size, align,
Zhen Lei7af3a0a2016-09-01 14:55:00 +0800164 __pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid);
165}
166
167static void __init pcpu_fc_free(void *ptr, size_t size)
168{
Mike Rapoport4421cca02021-11-05 13:43:22 -0700169 memblock_free(ptr, size);
Zhen Lei7af3a0a2016-09-01 14:55:00 +0800170}
171
Kefeng Wang09cea612021-11-05 13:39:44 -0700172#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
173static void __init pcpu_populate_pte(unsigned long addr)
174{
175 pgd_t *pgd = pgd_offset_k(addr);
176 p4d_t *p4d;
177 pud_t *pud;
178 pmd_t *pmd;
179
180 p4d = p4d_offset(pgd, addr);
181 if (p4d_none(*p4d)) {
182 pud_t *new;
183
184 new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
185 if (!new)
186 goto err_alloc;
187 p4d_populate(&init_mm, p4d, new);
188 }
189
190 pud = pud_offset(p4d, addr);
191 if (pud_none(*pud)) {
192 pmd_t *new;
193
194 new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
195 if (!new)
196 goto err_alloc;
197 pud_populate(&init_mm, pud, new);
198 }
199
200 pmd = pmd_offset(pud, addr);
201 if (!pmd_present(*pmd)) {
202 pte_t *new;
203
204 new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
205 if (!new)
206 goto err_alloc;
207 pmd_populate_kernel(&init_mm, pmd, new);
208 }
209
210 return;
211
212err_alloc:
213 panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
214 __func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
215}
216#endif
217
Zhen Lei7af3a0a2016-09-01 14:55:00 +0800218void __init setup_per_cpu_areas(void)
219{
220 unsigned long delta;
221 unsigned int cpu;
Kefeng Wang09cea612021-11-05 13:39:44 -0700222 int rc = -EINVAL;
Zhen Lei7af3a0a2016-09-01 14:55:00 +0800223
Kefeng Wang09cea612021-11-05 13:39:44 -0700224 if (pcpu_chosen_fc != PCPU_FC_PAGE) {
225 /*
226 * Always reserve area for module percpu variables. That's
227 * what the legacy allocator did.
228 */
229 rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
230 PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
231 pcpu_cpu_distance,
232 pcpu_fc_alloc, pcpu_fc_free);
233#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
234 if (rc < 0)
235 pr_warn("PERCPU: %s allocator failed (%d), falling back to page size\n",
236 pcpu_fc_names[pcpu_chosen_fc], rc);
237#endif
238 }
239
240#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
Zhen Lei7af3a0a2016-09-01 14:55:00 +0800241 if (rc < 0)
Kefeng Wang09cea612021-11-05 13:39:44 -0700242 rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE,
243 pcpu_fc_alloc,
244 pcpu_fc_free,
245 pcpu_populate_pte);
246#endif
247 if (rc < 0)
248 panic("Failed to initialize percpu areas (err=%d).", rc);
Zhen Lei7af3a0a2016-09-01 14:55:00 +0800249
250 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
251 for_each_possible_cpu(cpu)
252 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
253}
254#endif
255
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700256/**
Qian Caib1ce45e2019-03-14 12:16:19 -0400257 * numa_add_memblk() - Set node id to memblk
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700258 * @nid: NUMA node ID of the new memblk
259 * @start: Start address of the new memblk
Hanjun Guo8ccbbda2016-05-24 15:35:36 -0700260 * @end: End address of the new memblk
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700261 *
262 * RETURNS:
263 * 0 on success, -errno on failure.
264 */
Hanjun Guo8ccbbda2016-05-24 15:35:36 -0700265int __init numa_add_memblk(int nid, u64 start, u64 end)
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700266{
267 int ret;
268
Hanjun Guo8ccbbda2016-05-24 15:35:36 -0700269 ret = memblock_set_node(start, (end - start), &memblock.memory, nid);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700270 if (ret < 0) {
Kefeng Wangf11c7ba2016-09-01 14:54:59 +0800271 pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n",
Hanjun Guo8ccbbda2016-05-24 15:35:36 -0700272 start, (end - 1), nid);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700273 return ret;
274 }
275
276 node_set(nid, numa_nodes_parsed);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700277 return ret;
278}
279
Qian Caib1ce45e2019-03-14 12:16:19 -0400280/*
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700281 * Initialize NODE_DATA for a node on the local memory
282 */
283static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
284{
285 const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
286 u64 nd_pa;
287 void *nd;
288 int tnid;
289
Punit Agrawalece4b202017-07-20 12:03:59 +0100290 if (start_pfn >= end_pfn)
Hanjun Guo3f7a09f2016-10-21 16:13:56 +0800291 pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700292
Mike Rapoport9a8dd702018-10-30 15:07:59 -0700293 nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
Mike Rapoport33755572019-03-11 23:29:21 -0700294 if (!nd_pa)
295 panic("Cannot allocate %zu bytes for node %d data\n",
296 nd_size, nid);
297
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700298 nd = __va(nd_pa);
299
300 /* report and initialize */
Kefeng Wangf11c7ba2016-09-01 14:54:59 +0800301 pr_info("NODE_DATA [mem %#010Lx-%#010Lx]\n",
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700302 nd_pa, nd_pa + nd_size - 1);
303 tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
304 if (tnid != nid)
Kefeng Wangf11c7ba2016-09-01 14:54:59 +0800305 pr_info("NODE_DATA(%d) on node %d\n", nid, tnid);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700306
307 node_data[nid] = nd;
308 memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
309 NODE_DATA(nid)->node_id = nid;
310 NODE_DATA(nid)->node_start_pfn = start_pfn;
311 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
312}
313
Qian Caib1ce45e2019-03-14 12:16:19 -0400314/*
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700315 * numa_free_distance
316 *
317 * The current table is freed.
318 */
319void __init numa_free_distance(void)
320{
321 size_t size;
322
323 if (!numa_distance)
324 return;
325
326 size = numa_distance_cnt * numa_distance_cnt *
327 sizeof(numa_distance[0]);
328
Mike Rapoport4421cca02021-11-05 13:43:22 -0700329 memblock_free(numa_distance, size);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700330 numa_distance_cnt = 0;
331 numa_distance = NULL;
332}
333
Qian Caib1ce45e2019-03-14 12:16:19 -0400334/*
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700335 * Create a new NUMA distance table.
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700336 */
337static int __init numa_alloc_distance(void)
338{
339 size_t size;
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700340 int i, j;
341
342 size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
Mike Rapoport5787ea52021-11-05 13:43:07 -0700343 numa_distance = memblock_alloc(size, PAGE_SIZE);
344 if (WARN_ON(!numa_distance))
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700345 return -ENOMEM;
346
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700347 numa_distance_cnt = nr_node_ids;
348
349 /* fill with the default distances */
350 for (i = 0; i < numa_distance_cnt; i++)
351 for (j = 0; j < numa_distance_cnt; j++)
352 numa_distance[i * numa_distance_cnt + j] = i == j ?
353 LOCAL_DISTANCE : REMOTE_DISTANCE;
354
Kefeng Wangf11c7ba2016-09-01 14:54:59 +0800355 pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700356
357 return 0;
358}
359
360/**
Qian Caib1ce45e2019-03-14 12:16:19 -0400361 * numa_set_distance() - Set inter node NUMA distance from node to node.
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700362 * @from: the 'from' node to set distance
363 * @to: the 'to' node to set distance
364 * @distance: NUMA distance
365 *
366 * Set the distance from node @from to @to to @distance.
367 * If distance table doesn't exist, a warning is printed.
368 *
369 * If @from or @to is higher than the highest known node or lower than zero
370 * or @distance doesn't make sense, the call is ignored.
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700371 */
372void __init numa_set_distance(int from, int to, int distance)
373{
374 if (!numa_distance) {
Kefeng Wangf11c7ba2016-09-01 14:54:59 +0800375 pr_warn_once("Warning: distance table not allocated yet\n");
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700376 return;
377 }
378
379 if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
380 from < 0 || to < 0) {
Kefeng Wangf11c7ba2016-09-01 14:54:59 +0800381 pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700382 from, to, distance);
383 return;
384 }
385
386 if ((u8)distance != distance ||
387 (from == to && distance != LOCAL_DISTANCE)) {
Kefeng Wangf11c7ba2016-09-01 14:54:59 +0800388 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700389 from, to, distance);
390 return;
391 }
392
393 numa_distance[from * numa_distance_cnt + to] = distance;
394}
395
Qian Caib1ce45e2019-03-14 12:16:19 -0400396/*
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700397 * Return NUMA distance @from to @to
398 */
399int __node_distance(int from, int to)
400{
401 if (from >= numa_distance_cnt || to >= numa_distance_cnt)
402 return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
403 return numa_distance[from * numa_distance_cnt + to];
404}
405EXPORT_SYMBOL(__node_distance);
406
407static int __init numa_register_nodes(void)
408{
409 int nid;
410 struct memblock_region *mblk;
411
412 /* Check that valid nid is set to memblks */
Mike Rapoportcc6de1682020-10-13 16:58:30 -0700413 for_each_mem_region(mblk) {
Mike Rapoportd622abf2020-06-03 15:56:53 -0700414 int mblk_nid = memblock_get_region_node(mblk);
Randy Dunlap4cd48bb2021-01-27 19:55:33 -0800415 phys_addr_t start = mblk->base;
416 phys_addr_t end = mblk->base + mblk->size - 1;
Mike Rapoportd622abf2020-06-03 15:56:53 -0700417
418 if (mblk_nid == NUMA_NO_NODE || mblk_nid >= MAX_NUMNODES) {
Randy Dunlap4cd48bb2021-01-27 19:55:33 -0800419 pr_warn("Warning: invalid memblk node %d [mem %pap-%pap]\n",
420 mblk_nid, &start, &end);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700421 return -EINVAL;
422 }
Mike Rapoportd622abf2020-06-03 15:56:53 -0700423 }
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700424
425 /* Finally register nodes. */
426 for_each_node_mask(nid, numa_nodes_parsed) {
427 unsigned long start_pfn, end_pfn;
428
429 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
430 setup_node_data(nid, start_pfn, end_pfn);
431 node_set_online(nid);
432 }
433
434 /* Setup online nodes to actual nodes*/
435 node_possible_map = numa_nodes_parsed;
436
437 return 0;
438}
439
440static int __init numa_init(int (*init_func)(void))
441{
442 int ret;
443
444 nodes_clear(numa_nodes_parsed);
445 nodes_clear(node_possible_map);
446 nodes_clear(node_online_map);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700447
448 ret = numa_alloc_distance();
449 if (ret < 0)
450 return ret;
451
452 ret = init_func();
453 if (ret < 0)
Anshuman Khandual52338082018-09-22 21:09:56 +0530454 goto out_free_distance;
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700455
Zhen Lei794224ea2016-09-01 14:54:56 +0800456 if (nodes_empty(numa_nodes_parsed)) {
457 pr_info("No NUMA configuration found\n");
Anshuman Khandual52338082018-09-22 21:09:56 +0530458 ret = -EINVAL;
459 goto out_free_distance;
Zhen Lei794224ea2016-09-01 14:54:56 +0800460 }
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700461
462 ret = numa_register_nodes();
463 if (ret < 0)
Anshuman Khandual52338082018-09-22 21:09:56 +0530464 goto out_free_distance;
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700465
466 setup_node_to_cpumask_map();
467
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700468 return 0;
Anshuman Khandual52338082018-09-22 21:09:56 +0530469out_free_distance:
470 numa_free_distance();
471 return ret;
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700472}
473
474/**
Qian Caib1ce45e2019-03-14 12:16:19 -0400475 * dummy_numa_init() - Fallback dummy NUMA init
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700476 *
477 * Used if there's no underlying NUMA architecture, NUMA initialization
478 * fails, or NUMA is disabled on the command line.
479 *
480 * Must online at least one node (node 0) and add memory blocks that cover all
481 * allowed memory. It is unlikely that this function fails.
Qian Caib1ce45e2019-03-14 12:16:19 -0400482 *
483 * Return: 0 on success, -errno on failure.
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700484 */
485static int __init dummy_numa_init(void)
486{
Mike Rapoportab8f21a2020-10-13 16:57:31 -0700487 phys_addr_t start = memblock_start_of_DRAM();
Randy Dunlap4cd48bb2021-01-27 19:55:33 -0800488 phys_addr_t end = memblock_end_of_DRAM() - 1;
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700489 int ret;
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700490
David Daney34c33372016-05-24 15:35:37 -0700491 if (numa_off)
492 pr_info("NUMA disabled\n"); /* Forced off on command line. */
Randy Dunlap4cd48bb2021-01-27 19:55:33 -0800493 pr_info("Faking a node at [mem %pap-%pap]\n", &start, &end);
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700494
Randy Dunlap4cd48bb2021-01-27 19:55:33 -0800495 ret = numa_add_memblk(0, start, end + 1);
Mike Rapoportab8f21a2020-10-13 16:57:31 -0700496 if (ret) {
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700497 pr_err("NUMA init failed\n");
498 return ret;
499 }
500
David Daney34c33372016-05-24 15:35:37 -0700501 numa_off = true;
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700502 return 0;
503}
504
Atish Patraeb755412020-11-18 16:38:25 -0800505#ifdef CONFIG_ACPI_NUMA
506static int __init arch_acpi_numa_init(void)
507{
508 int ret;
509
510 ret = acpi_numa_init();
511 if (ret) {
512 pr_info("Failed to initialise from firmware\n");
513 return ret;
514 }
515
516 return srat_disabled() ? -EINVAL : 0;
517}
518#else
519static int __init arch_acpi_numa_init(void)
520{
521 return -EOPNOTSUPP;
522}
523#endif
524
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700525/**
Atish Patraeb755412020-11-18 16:38:25 -0800526 * arch_numa_init() - Initialize NUMA
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700527 *
Qian Caib1ce45e2019-03-14 12:16:19 -0400528 * Try each configured NUMA initialization method until one succeeds. The
Yanfei Xu9a747c92020-09-01 17:11:54 +0800529 * last fallback is dummy single node config encompassing whole memory.
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700530 */
Atish Patraeb755412020-11-18 16:38:25 -0800531void __init arch_numa_init(void)
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700532{
533 if (!numa_off) {
Atish Patraeb755412020-11-18 16:38:25 -0800534 if (!acpi_disabled && !numa_init(arch_acpi_numa_init))
Hanjun Guod8b47fc2016-05-24 15:35:44 -0700535 return;
536 if (acpi_disabled && !numa_init(of_numa_init))
Ganapatrao Kulkarni1a2db302016-04-08 15:50:27 -0700537 return;
538 }
539
540 numa_init(dummy_numa_init);
541}