Commit | Line | Data |
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caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1a2db300 GK |
2 | /* |
3 | * NUMA support, based on the x86 implementation. | |
4 | * | |
5 | * Copyright (C) 2015 Cavium Inc. | |
6 | * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com> | |
1a2db300 GK |
7 | */ |
8 | ||
f11c7bac KW |
9 | #define pr_fmt(fmt) "NUMA: " fmt |
10 | ||
d8b47fca | 11 | #include <linux/acpi.h> |
1a2db300 GK |
12 | #include <linux/memblock.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/of.h> | |
15 | ||
7af3a0a9 | 16 | #include <asm/sections.h> |
bfe6c8a8 | 17 | |
1a2db300 GK |
18 | struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; |
19 | EXPORT_SYMBOL(node_data); | |
20 | nodemask_t numa_nodes_parsed __initdata; | |
21 | static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE }; | |
22 | ||
23 | static int numa_distance_cnt; | |
24 | static u8 *numa_distance; | |
aec03f89 | 25 | bool numa_off; |
1a2db300 GK |
26 | |
27 | static __init int numa_parse_early_param(char *opt) | |
28 | { | |
29 | if (!opt) | |
30 | return -EINVAL; | |
b3e089cd | 31 | if (str_has_prefix(opt, "off")) |
34c33370 | 32 | numa_off = true; |
f11c7bac | 33 | |
1a2db300 GK |
34 | return 0; |
35 | } | |
36 | early_param("numa", numa_parse_early_param); | |
37 | ||
38 | cpumask_var_t node_to_cpumask_map[MAX_NUMNODES]; | |
39 | EXPORT_SYMBOL(node_to_cpumask_map); | |
40 | ||
41 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS | |
42 | ||
43 | /* | |
44 | * Returns a pointer to the bitmask of CPUs on Node 'node'. | |
45 | */ | |
46 | const struct cpumask *cpumask_of_node(int node) | |
47 | { | |
a194c5f2 ZL |
48 | |
49 | if (node == NUMA_NO_NODE) | |
50 | return cpu_all_mask; | |
51 | ||
52 | if (WARN_ON(node < 0 || node >= nr_node_ids)) | |
1a2db300 GK |
53 | return cpu_none_mask; |
54 | ||
55 | if (WARN_ON(node_to_cpumask_map[node] == NULL)) | |
56 | return cpu_online_mask; | |
57 | ||
58 | return node_to_cpumask_map[node]; | |
59 | } | |
60 | EXPORT_SYMBOL(cpumask_of_node); | |
61 | ||
62 | #endif | |
63 | ||
97fd6016 | 64 | static void numa_update_cpu(unsigned int cpu, bool remove) |
1a2db300 | 65 | { |
97fd6016 SH |
66 | int nid = cpu_to_node(cpu); |
67 | ||
68 | if (nid == NUMA_NO_NODE) | |
69 | return; | |
70 | ||
71 | if (remove) | |
72 | cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]); | |
73 | else | |
1a2db300 GK |
74 | cpumask_set_cpu(cpu, node_to_cpumask_map[nid]); |
75 | } | |
76 | ||
97fd6016 | 77 | void numa_add_cpu(unsigned int cpu) |
1a2db300 | 78 | { |
97fd6016 SH |
79 | numa_update_cpu(cpu, false); |
80 | } | |
1a2db300 | 81 | |
97fd6016 SH |
82 | void numa_remove_cpu(unsigned int cpu) |
83 | { | |
84 | numa_update_cpu(cpu, true); | |
85 | } | |
86 | ||
87 | void numa_clear_node(unsigned int cpu) | |
88 | { | |
89 | numa_remove_cpu(cpu); | |
1a2db300 GK |
90 | set_cpu_numa_node(cpu, NUMA_NO_NODE); |
91 | } | |
92 | ||
93 | /* | |
94 | * Allocate node_to_cpumask_map based on number of available nodes | |
95 | * Requires node_possible_map to be valid. | |
96 | * | |
97 | * Note: cpumask_of_node() is not valid until after this is done. | |
98 | * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.) | |
99 | */ | |
100 | static void __init setup_node_to_cpumask_map(void) | |
101 | { | |
1a2db300 GK |
102 | int node; |
103 | ||
104 | /* setup nr_node_ids if not done yet */ | |
105 | if (nr_node_ids == MAX_NUMNODES) | |
106 | setup_nr_node_ids(); | |
107 | ||
108 | /* allocate and clear the mapping */ | |
109 | for (node = 0; node < nr_node_ids; node++) { | |
110 | alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]); | |
111 | cpumask_clear(node_to_cpumask_map[node]); | |
112 | } | |
113 | ||
1a2db300 | 114 | /* cpumask_of_node() will now work */ |
b9726c26 | 115 | pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids); |
1a2db300 GK |
116 | } |
117 | ||
118 | /* | |
b1ce45e8 | 119 | * Set the cpu to node and mem mapping |
1a2db300 GK |
120 | */ |
121 | void numa_store_cpu_info(unsigned int cpu) | |
122 | { | |
97fd6016 | 123 | set_cpu_numa_node(cpu, cpu_to_node_map[cpu]); |
1a2db300 GK |
124 | } |
125 | ||
126 | void __init early_map_cpu_to_node(unsigned int cpu, int nid) | |
127 | { | |
128 | /* fallback to node 0 */ | |
7ba5f605 | 129 | if (nid < 0 || nid >= MAX_NUMNODES || numa_off) |
1a2db300 GK |
130 | nid = 0; |
131 | ||
132 | cpu_to_node_map[cpu] = nid; | |
7ba5f605 ZL |
133 | |
134 | /* | |
135 | * We should set the numa node of cpu0 as soon as possible, because it | |
136 | * has already been set up online before. cpu_to_node(0) will soon be | |
137 | * called. | |
138 | */ | |
139 | if (!cpu) | |
140 | set_cpu_numa_node(cpu, nid); | |
1a2db300 GK |
141 | } |
142 | ||
7af3a0a9 ZL |
143 | #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA |
144 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly; | |
145 | EXPORT_SYMBOL(__per_cpu_offset); | |
146 | ||
147 | static int __init early_cpu_to_node(int cpu) | |
148 | { | |
149 | return cpu_to_node_map[cpu]; | |
150 | } | |
151 | ||
152 | static int __init pcpu_cpu_distance(unsigned int from, unsigned int to) | |
153 | { | |
26984c3b | 154 | return node_distance(early_cpu_to_node(from), early_cpu_to_node(to)); |
7af3a0a9 ZL |
155 | } |
156 | ||
7af3a0a9 ZL |
157 | void __init setup_per_cpu_areas(void) |
158 | { | |
159 | unsigned long delta; | |
160 | unsigned int cpu; | |
09cea619 KW |
161 | int rc = -EINVAL; |
162 | ||
163 | if (pcpu_chosen_fc != PCPU_FC_PAGE) { | |
164 | /* | |
165 | * Always reserve area for module percpu variables. That's | |
166 | * what the legacy allocator did. | |
167 | */ | |
168 | rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE, | |
169 | PERCPU_DYNAMIC_RESERVE, PAGE_SIZE, | |
170 | pcpu_cpu_distance, | |
23f91716 | 171 | early_cpu_to_node); |
09cea619 KW |
172 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
173 | if (rc < 0) | |
174 | pr_warn("PERCPU: %s allocator failed (%d), falling back to page size\n", | |
175 | pcpu_fc_names[pcpu_chosen_fc], rc); | |
176 | #endif | |
177 | } | |
7af3a0a9 | 178 | |
09cea619 KW |
179 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
180 | if (rc < 0) | |
20c03576 | 181 | rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, early_cpu_to_node); |
09cea619 | 182 | #endif |
7af3a0a9 | 183 | if (rc < 0) |
09cea619 | 184 | panic("Failed to initialize percpu areas (err=%d).", rc); |
7af3a0a9 ZL |
185 | |
186 | delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; | |
187 | for_each_possible_cpu(cpu) | |
188 | __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu]; | |
189 | } | |
190 | #endif | |
191 | ||
1a2db300 | 192 | /** |
b1ce45e8 | 193 | * numa_add_memblk() - Set node id to memblk |
1a2db300 GK |
194 | * @nid: NUMA node ID of the new memblk |
195 | * @start: Start address of the new memblk | |
8ccbbdaa | 196 | * @end: End address of the new memblk |
1a2db300 GK |
197 | * |
198 | * RETURNS: | |
199 | * 0 on success, -errno on failure. | |
200 | */ | |
8ccbbdaa | 201 | int __init numa_add_memblk(int nid, u64 start, u64 end) |
1a2db300 GK |
202 | { |
203 | int ret; | |
204 | ||
8ccbbdaa | 205 | ret = memblock_set_node(start, (end - start), &memblock.memory, nid); |
1a2db300 | 206 | if (ret < 0) { |
f11c7bac | 207 | pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n", |
8ccbbdaa | 208 | start, (end - 1), nid); |
1a2db300 GK |
209 | return ret; |
210 | } | |
211 | ||
212 | node_set(nid, numa_nodes_parsed); | |
1a2db300 GK |
213 | return ret; |
214 | } | |
215 | ||
b1ce45e8 | 216 | /* |
1a2db300 GK |
217 | * Initialize NODE_DATA for a node on the local memory |
218 | */ | |
219 | static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn) | |
220 | { | |
221 | const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES); | |
222 | u64 nd_pa; | |
223 | void *nd; | |
224 | int tnid; | |
225 | ||
ece4b206 | 226 | if (start_pfn >= end_pfn) |
3f7a09f4 | 227 | pr_info("Initmem setup node %d [<memory-less node>]\n", nid); |
1a2db300 | 228 | |
9a8dd708 | 229 | nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid); |
33755574 MR |
230 | if (!nd_pa) |
231 | panic("Cannot allocate %zu bytes for node %d data\n", | |
232 | nd_size, nid); | |
233 | ||
1a2db300 GK |
234 | nd = __va(nd_pa); |
235 | ||
236 | /* report and initialize */ | |
f11c7bac | 237 | pr_info("NODE_DATA [mem %#010Lx-%#010Lx]\n", |
1a2db300 GK |
238 | nd_pa, nd_pa + nd_size - 1); |
239 | tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT); | |
240 | if (tnid != nid) | |
f11c7bac | 241 | pr_info("NODE_DATA(%d) on node %d\n", nid, tnid); |
1a2db300 GK |
242 | |
243 | node_data[nid] = nd; | |
244 | memset(NODE_DATA(nid), 0, sizeof(pg_data_t)); | |
245 | NODE_DATA(nid)->node_id = nid; | |
246 | NODE_DATA(nid)->node_start_pfn = start_pfn; | |
247 | NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; | |
248 | } | |
249 | ||
b1ce45e8 | 250 | /* |
1a2db300 GK |
251 | * numa_free_distance |
252 | * | |
253 | * The current table is freed. | |
254 | */ | |
255 | void __init numa_free_distance(void) | |
256 | { | |
257 | size_t size; | |
258 | ||
259 | if (!numa_distance) | |
260 | return; | |
261 | ||
262 | size = numa_distance_cnt * numa_distance_cnt * | |
263 | sizeof(numa_distance[0]); | |
264 | ||
4421cca0 | 265 | memblock_free(numa_distance, size); |
1a2db300 GK |
266 | numa_distance_cnt = 0; |
267 | numa_distance = NULL; | |
268 | } | |
269 | ||
b1ce45e8 | 270 | /* |
1a2db300 | 271 | * Create a new NUMA distance table. |
1a2db300 GK |
272 | */ |
273 | static int __init numa_alloc_distance(void) | |
274 | { | |
275 | size_t size; | |
1a2db300 GK |
276 | int i, j; |
277 | ||
278 | size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]); | |
5787ea5b MR |
279 | numa_distance = memblock_alloc(size, PAGE_SIZE); |
280 | if (WARN_ON(!numa_distance)) | |
1a2db300 GK |
281 | return -ENOMEM; |
282 | ||
1a2db300 GK |
283 | numa_distance_cnt = nr_node_ids; |
284 | ||
285 | /* fill with the default distances */ | |
286 | for (i = 0; i < numa_distance_cnt; i++) | |
287 | for (j = 0; j < numa_distance_cnt; j++) | |
288 | numa_distance[i * numa_distance_cnt + j] = i == j ? | |
289 | LOCAL_DISTANCE : REMOTE_DISTANCE; | |
290 | ||
f11c7bac | 291 | pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt); |
1a2db300 GK |
292 | |
293 | return 0; | |
294 | } | |
295 | ||
296 | /** | |
b1ce45e8 | 297 | * numa_set_distance() - Set inter node NUMA distance from node to node. |
1a2db300 GK |
298 | * @from: the 'from' node to set distance |
299 | * @to: the 'to' node to set distance | |
300 | * @distance: NUMA distance | |
301 | * | |
302 | * Set the distance from node @from to @to to @distance. | |
303 | * If distance table doesn't exist, a warning is printed. | |
304 | * | |
305 | * If @from or @to is higher than the highest known node or lower than zero | |
306 | * or @distance doesn't make sense, the call is ignored. | |
1a2db300 GK |
307 | */ |
308 | void __init numa_set_distance(int from, int to, int distance) | |
309 | { | |
310 | if (!numa_distance) { | |
f11c7bac | 311 | pr_warn_once("Warning: distance table not allocated yet\n"); |
1a2db300 GK |
312 | return; |
313 | } | |
314 | ||
315 | if (from >= numa_distance_cnt || to >= numa_distance_cnt || | |
316 | from < 0 || to < 0) { | |
f11c7bac | 317 | pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n", |
1a2db300 GK |
318 | from, to, distance); |
319 | return; | |
320 | } | |
321 | ||
322 | if ((u8)distance != distance || | |
323 | (from == to && distance != LOCAL_DISTANCE)) { | |
f11c7bac | 324 | pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n", |
1a2db300 GK |
325 | from, to, distance); |
326 | return; | |
327 | } | |
328 | ||
329 | numa_distance[from * numa_distance_cnt + to] = distance; | |
330 | } | |
331 | ||
b1ce45e8 | 332 | /* |
1a2db300 GK |
333 | * Return NUMA distance @from to @to |
334 | */ | |
335 | int __node_distance(int from, int to) | |
336 | { | |
337 | if (from >= numa_distance_cnt || to >= numa_distance_cnt) | |
338 | return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE; | |
339 | return numa_distance[from * numa_distance_cnt + to]; | |
340 | } | |
341 | EXPORT_SYMBOL(__node_distance); | |
342 | ||
343 | static int __init numa_register_nodes(void) | |
344 | { | |
345 | int nid; | |
346 | struct memblock_region *mblk; | |
347 | ||
348 | /* Check that valid nid is set to memblks */ | |
cc6de168 | 349 | for_each_mem_region(mblk) { |
d622abf7 | 350 | int mblk_nid = memblock_get_region_node(mblk); |
4cd48bb3 RD |
351 | phys_addr_t start = mblk->base; |
352 | phys_addr_t end = mblk->base + mblk->size - 1; | |
d622abf7 MR |
353 | |
354 | if (mblk_nid == NUMA_NO_NODE || mblk_nid >= MAX_NUMNODES) { | |
4cd48bb3 RD |
355 | pr_warn("Warning: invalid memblk node %d [mem %pap-%pap]\n", |
356 | mblk_nid, &start, &end); | |
1a2db300 GK |
357 | return -EINVAL; |
358 | } | |
d622abf7 | 359 | } |
1a2db300 GK |
360 | |
361 | /* Finally register nodes. */ | |
362 | for_each_node_mask(nid, numa_nodes_parsed) { | |
363 | unsigned long start_pfn, end_pfn; | |
364 | ||
365 | get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); | |
366 | setup_node_data(nid, start_pfn, end_pfn); | |
367 | node_set_online(nid); | |
368 | } | |
369 | ||
370 | /* Setup online nodes to actual nodes*/ | |
371 | node_possible_map = numa_nodes_parsed; | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | static int __init numa_init(int (*init_func)(void)) | |
377 | { | |
378 | int ret; | |
379 | ||
380 | nodes_clear(numa_nodes_parsed); | |
381 | nodes_clear(node_possible_map); | |
382 | nodes_clear(node_online_map); | |
1a2db300 GK |
383 | |
384 | ret = numa_alloc_distance(); | |
385 | if (ret < 0) | |
386 | return ret; | |
387 | ||
388 | ret = init_func(); | |
389 | if (ret < 0) | |
52338088 | 390 | goto out_free_distance; |
1a2db300 | 391 | |
794224ea ZL |
392 | if (nodes_empty(numa_nodes_parsed)) { |
393 | pr_info("No NUMA configuration found\n"); | |
52338088 AK |
394 | ret = -EINVAL; |
395 | goto out_free_distance; | |
794224ea | 396 | } |
1a2db300 GK |
397 | |
398 | ret = numa_register_nodes(); | |
399 | if (ret < 0) | |
52338088 | 400 | goto out_free_distance; |
1a2db300 GK |
401 | |
402 | setup_node_to_cpumask_map(); | |
403 | ||
1a2db300 | 404 | return 0; |
52338088 AK |
405 | out_free_distance: |
406 | numa_free_distance(); | |
407 | return ret; | |
1a2db300 GK |
408 | } |
409 | ||
410 | /** | |
b1ce45e8 | 411 | * dummy_numa_init() - Fallback dummy NUMA init |
1a2db300 GK |
412 | * |
413 | * Used if there's no underlying NUMA architecture, NUMA initialization | |
414 | * fails, or NUMA is disabled on the command line. | |
415 | * | |
416 | * Must online at least one node (node 0) and add memory blocks that cover all | |
417 | * allowed memory. It is unlikely that this function fails. | |
b1ce45e8 QC |
418 | * |
419 | * Return: 0 on success, -errno on failure. | |
1a2db300 GK |
420 | */ |
421 | static int __init dummy_numa_init(void) | |
422 | { | |
ab8f21aa | 423 | phys_addr_t start = memblock_start_of_DRAM(); |
4cd48bb3 | 424 | phys_addr_t end = memblock_end_of_DRAM() - 1; |
1a2db300 | 425 | int ret; |
1a2db300 | 426 | |
34c33370 DD |
427 | if (numa_off) |
428 | pr_info("NUMA disabled\n"); /* Forced off on command line. */ | |
4cd48bb3 | 429 | pr_info("Faking a node at [mem %pap-%pap]\n", &start, &end); |
1a2db300 | 430 | |
4cd48bb3 | 431 | ret = numa_add_memblk(0, start, end + 1); |
ab8f21aa | 432 | if (ret) { |
1a2db300 GK |
433 | pr_err("NUMA init failed\n"); |
434 | return ret; | |
435 | } | |
436 | ||
34c33370 | 437 | numa_off = true; |
1a2db300 GK |
438 | return 0; |
439 | } | |
440 | ||
eb75541f AP |
441 | #ifdef CONFIG_ACPI_NUMA |
442 | static int __init arch_acpi_numa_init(void) | |
443 | { | |
444 | int ret; | |
445 | ||
446 | ret = acpi_numa_init(); | |
447 | if (ret) { | |
448 | pr_info("Failed to initialise from firmware\n"); | |
449 | return ret; | |
450 | } | |
451 | ||
452 | return srat_disabled() ? -EINVAL : 0; | |
453 | } | |
454 | #else | |
455 | static int __init arch_acpi_numa_init(void) | |
456 | { | |
457 | return -EOPNOTSUPP; | |
458 | } | |
459 | #endif | |
460 | ||
1a2db300 | 461 | /** |
eb75541f | 462 | * arch_numa_init() - Initialize NUMA |
1a2db300 | 463 | * |
b1ce45e8 | 464 | * Try each configured NUMA initialization method until one succeeds. The |
9a747c91 | 465 | * last fallback is dummy single node config encompassing whole memory. |
1a2db300 | 466 | */ |
eb75541f | 467 | void __init arch_numa_init(void) |
1a2db300 GK |
468 | { |
469 | if (!numa_off) { | |
eb75541f | 470 | if (!acpi_disabled && !numa_init(arch_acpi_numa_init)) |
d8b47fca HG |
471 | return; |
472 | if (acpi_disabled && !numa_init(of_numa_init)) | |
1a2db300 GK |
473 | return; |
474 | } | |
475 | ||
476 | numa_init(dummy_numa_init); | |
477 | } |