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 | ||
157 | static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, | |
158 | size_t align) | |
159 | { | |
160 | int nid = early_cpu_to_node(cpu); | |
161 | ||
eb31d559 | 162 | return memblock_alloc_try_nid(size, align, |
7af3a0a9 ZL |
163 | __pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid); |
164 | } | |
165 | ||
166 | static void __init pcpu_fc_free(void *ptr, size_t size) | |
167 | { | |
168 | memblock_free_early(__pa(ptr), size); | |
169 | } | |
170 | ||
171 | void __init setup_per_cpu_areas(void) | |
172 | { | |
173 | unsigned long delta; | |
174 | unsigned int cpu; | |
175 | int rc; | |
176 | ||
177 | /* | |
178 | * Always reserve area for module percpu variables. That's | |
179 | * what the legacy allocator did. | |
180 | */ | |
181 | rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE, | |
182 | PERCPU_DYNAMIC_RESERVE, PAGE_SIZE, | |
183 | pcpu_cpu_distance, | |
184 | pcpu_fc_alloc, pcpu_fc_free); | |
185 | if (rc < 0) | |
186 | panic("Failed to initialize percpu areas."); | |
187 | ||
188 | delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; | |
189 | for_each_possible_cpu(cpu) | |
190 | __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu]; | |
191 | } | |
192 | #endif | |
193 | ||
1a2db300 | 194 | /** |
b1ce45e8 | 195 | * numa_add_memblk() - Set node id to memblk |
1a2db300 GK |
196 | * @nid: NUMA node ID of the new memblk |
197 | * @start: Start address of the new memblk | |
8ccbbdaa | 198 | * @end: End address of the new memblk |
1a2db300 GK |
199 | * |
200 | * RETURNS: | |
201 | * 0 on success, -errno on failure. | |
202 | */ | |
8ccbbdaa | 203 | int __init numa_add_memblk(int nid, u64 start, u64 end) |
1a2db300 GK |
204 | { |
205 | int ret; | |
206 | ||
8ccbbdaa | 207 | ret = memblock_set_node(start, (end - start), &memblock.memory, nid); |
1a2db300 | 208 | if (ret < 0) { |
f11c7bac | 209 | pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n", |
8ccbbdaa | 210 | start, (end - 1), nid); |
1a2db300 GK |
211 | return ret; |
212 | } | |
213 | ||
214 | node_set(nid, numa_nodes_parsed); | |
1a2db300 GK |
215 | return ret; |
216 | } | |
217 | ||
b1ce45e8 | 218 | /* |
1a2db300 GK |
219 | * Initialize NODE_DATA for a node on the local memory |
220 | */ | |
221 | static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn) | |
222 | { | |
223 | const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES); | |
224 | u64 nd_pa; | |
225 | void *nd; | |
226 | int tnid; | |
227 | ||
ece4b206 | 228 | if (start_pfn >= end_pfn) |
3f7a09f4 | 229 | pr_info("Initmem setup node %d [<memory-less node>]\n", nid); |
1a2db300 | 230 | |
9a8dd708 | 231 | nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid); |
33755574 MR |
232 | if (!nd_pa) |
233 | panic("Cannot allocate %zu bytes for node %d data\n", | |
234 | nd_size, nid); | |
235 | ||
1a2db300 GK |
236 | nd = __va(nd_pa); |
237 | ||
238 | /* report and initialize */ | |
f11c7bac | 239 | pr_info("NODE_DATA [mem %#010Lx-%#010Lx]\n", |
1a2db300 GK |
240 | nd_pa, nd_pa + nd_size - 1); |
241 | tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT); | |
242 | if (tnid != nid) | |
f11c7bac | 243 | pr_info("NODE_DATA(%d) on node %d\n", nid, tnid); |
1a2db300 GK |
244 | |
245 | node_data[nid] = nd; | |
246 | memset(NODE_DATA(nid), 0, sizeof(pg_data_t)); | |
247 | NODE_DATA(nid)->node_id = nid; | |
248 | NODE_DATA(nid)->node_start_pfn = start_pfn; | |
249 | NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; | |
250 | } | |
251 | ||
b1ce45e8 | 252 | /* |
1a2db300 GK |
253 | * numa_free_distance |
254 | * | |
255 | * The current table is freed. | |
256 | */ | |
257 | void __init numa_free_distance(void) | |
258 | { | |
259 | size_t size; | |
260 | ||
261 | if (!numa_distance) | |
262 | return; | |
263 | ||
264 | size = numa_distance_cnt * numa_distance_cnt * | |
265 | sizeof(numa_distance[0]); | |
266 | ||
267 | memblock_free(__pa(numa_distance), size); | |
268 | numa_distance_cnt = 0; | |
269 | numa_distance = NULL; | |
270 | } | |
271 | ||
b1ce45e8 | 272 | /* |
1a2db300 | 273 | * Create a new NUMA distance table. |
1a2db300 GK |
274 | */ |
275 | static int __init numa_alloc_distance(void) | |
276 | { | |
277 | size_t size; | |
278 | u64 phys; | |
279 | int i, j; | |
280 | ||
281 | size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]); | |
282 | phys = memblock_find_in_range(0, PFN_PHYS(max_pfn), | |
283 | size, PAGE_SIZE); | |
284 | if (WARN_ON(!phys)) | |
285 | return -ENOMEM; | |
286 | ||
287 | memblock_reserve(phys, size); | |
288 | ||
289 | numa_distance = __va(phys); | |
290 | numa_distance_cnt = nr_node_ids; | |
291 | ||
292 | /* fill with the default distances */ | |
293 | for (i = 0; i < numa_distance_cnt; i++) | |
294 | for (j = 0; j < numa_distance_cnt; j++) | |
295 | numa_distance[i * numa_distance_cnt + j] = i == j ? | |
296 | LOCAL_DISTANCE : REMOTE_DISTANCE; | |
297 | ||
f11c7bac | 298 | pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt); |
1a2db300 GK |
299 | |
300 | return 0; | |
301 | } | |
302 | ||
303 | /** | |
b1ce45e8 | 304 | * numa_set_distance() - Set inter node NUMA distance from node to node. |
1a2db300 GK |
305 | * @from: the 'from' node to set distance |
306 | * @to: the 'to' node to set distance | |
307 | * @distance: NUMA distance | |
308 | * | |
309 | * Set the distance from node @from to @to to @distance. | |
310 | * If distance table doesn't exist, a warning is printed. | |
311 | * | |
312 | * If @from or @to is higher than the highest known node or lower than zero | |
313 | * or @distance doesn't make sense, the call is ignored. | |
1a2db300 GK |
314 | */ |
315 | void __init numa_set_distance(int from, int to, int distance) | |
316 | { | |
317 | if (!numa_distance) { | |
f11c7bac | 318 | pr_warn_once("Warning: distance table not allocated yet\n"); |
1a2db300 GK |
319 | return; |
320 | } | |
321 | ||
322 | if (from >= numa_distance_cnt || to >= numa_distance_cnt || | |
323 | from < 0 || to < 0) { | |
f11c7bac | 324 | pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n", |
1a2db300 GK |
325 | from, to, distance); |
326 | return; | |
327 | } | |
328 | ||
329 | if ((u8)distance != distance || | |
330 | (from == to && distance != LOCAL_DISTANCE)) { | |
f11c7bac | 331 | pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n", |
1a2db300 GK |
332 | from, to, distance); |
333 | return; | |
334 | } | |
335 | ||
336 | numa_distance[from * numa_distance_cnt + to] = distance; | |
337 | } | |
338 | ||
b1ce45e8 | 339 | /* |
1a2db300 GK |
340 | * Return NUMA distance @from to @to |
341 | */ | |
342 | int __node_distance(int from, int to) | |
343 | { | |
344 | if (from >= numa_distance_cnt || to >= numa_distance_cnt) | |
345 | return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE; | |
346 | return numa_distance[from * numa_distance_cnt + to]; | |
347 | } | |
348 | EXPORT_SYMBOL(__node_distance); | |
349 | ||
350 | static int __init numa_register_nodes(void) | |
351 | { | |
352 | int nid; | |
353 | struct memblock_region *mblk; | |
354 | ||
355 | /* Check that valid nid is set to memblks */ | |
cc6de168 | 356 | for_each_mem_region(mblk) { |
d622abf7 | 357 | int mblk_nid = memblock_get_region_node(mblk); |
4cd48bb3 RD |
358 | phys_addr_t start = mblk->base; |
359 | phys_addr_t end = mblk->base + mblk->size - 1; | |
d622abf7 MR |
360 | |
361 | if (mblk_nid == NUMA_NO_NODE || mblk_nid >= MAX_NUMNODES) { | |
4cd48bb3 RD |
362 | pr_warn("Warning: invalid memblk node %d [mem %pap-%pap]\n", |
363 | mblk_nid, &start, &end); | |
1a2db300 GK |
364 | return -EINVAL; |
365 | } | |
d622abf7 | 366 | } |
1a2db300 GK |
367 | |
368 | /* Finally register nodes. */ | |
369 | for_each_node_mask(nid, numa_nodes_parsed) { | |
370 | unsigned long start_pfn, end_pfn; | |
371 | ||
372 | get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); | |
373 | setup_node_data(nid, start_pfn, end_pfn); | |
374 | node_set_online(nid); | |
375 | } | |
376 | ||
377 | /* Setup online nodes to actual nodes*/ | |
378 | node_possible_map = numa_nodes_parsed; | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static int __init numa_init(int (*init_func)(void)) | |
384 | { | |
385 | int ret; | |
386 | ||
387 | nodes_clear(numa_nodes_parsed); | |
388 | nodes_clear(node_possible_map); | |
389 | nodes_clear(node_online_map); | |
1a2db300 GK |
390 | |
391 | ret = numa_alloc_distance(); | |
392 | if (ret < 0) | |
393 | return ret; | |
394 | ||
395 | ret = init_func(); | |
396 | if (ret < 0) | |
52338088 | 397 | goto out_free_distance; |
1a2db300 | 398 | |
794224ea ZL |
399 | if (nodes_empty(numa_nodes_parsed)) { |
400 | pr_info("No NUMA configuration found\n"); | |
52338088 AK |
401 | ret = -EINVAL; |
402 | goto out_free_distance; | |
794224ea | 403 | } |
1a2db300 GK |
404 | |
405 | ret = numa_register_nodes(); | |
406 | if (ret < 0) | |
52338088 | 407 | goto out_free_distance; |
1a2db300 GK |
408 | |
409 | setup_node_to_cpumask_map(); | |
410 | ||
1a2db300 | 411 | return 0; |
52338088 AK |
412 | out_free_distance: |
413 | numa_free_distance(); | |
414 | return ret; | |
1a2db300 GK |
415 | } |
416 | ||
417 | /** | |
b1ce45e8 | 418 | * dummy_numa_init() - Fallback dummy NUMA init |
1a2db300 GK |
419 | * |
420 | * Used if there's no underlying NUMA architecture, NUMA initialization | |
421 | * fails, or NUMA is disabled on the command line. | |
422 | * | |
423 | * Must online at least one node (node 0) and add memory blocks that cover all | |
424 | * allowed memory. It is unlikely that this function fails. | |
b1ce45e8 QC |
425 | * |
426 | * Return: 0 on success, -errno on failure. | |
1a2db300 GK |
427 | */ |
428 | static int __init dummy_numa_init(void) | |
429 | { | |
ab8f21aa | 430 | phys_addr_t start = memblock_start_of_DRAM(); |
4cd48bb3 | 431 | phys_addr_t end = memblock_end_of_DRAM() - 1; |
1a2db300 | 432 | int ret; |
1a2db300 | 433 | |
34c33370 DD |
434 | if (numa_off) |
435 | pr_info("NUMA disabled\n"); /* Forced off on command line. */ | |
4cd48bb3 | 436 | pr_info("Faking a node at [mem %pap-%pap]\n", &start, &end); |
1a2db300 | 437 | |
4cd48bb3 | 438 | ret = numa_add_memblk(0, start, end + 1); |
ab8f21aa | 439 | if (ret) { |
1a2db300 GK |
440 | pr_err("NUMA init failed\n"); |
441 | return ret; | |
442 | } | |
443 | ||
34c33370 | 444 | numa_off = true; |
1a2db300 GK |
445 | return 0; |
446 | } | |
447 | ||
eb75541f AP |
448 | #ifdef CONFIG_ACPI_NUMA |
449 | static int __init arch_acpi_numa_init(void) | |
450 | { | |
451 | int ret; | |
452 | ||
453 | ret = acpi_numa_init(); | |
454 | if (ret) { | |
455 | pr_info("Failed to initialise from firmware\n"); | |
456 | return ret; | |
457 | } | |
458 | ||
459 | return srat_disabled() ? -EINVAL : 0; | |
460 | } | |
461 | #else | |
462 | static int __init arch_acpi_numa_init(void) | |
463 | { | |
464 | return -EOPNOTSUPP; | |
465 | } | |
466 | #endif | |
467 | ||
1a2db300 | 468 | /** |
eb75541f | 469 | * arch_numa_init() - Initialize NUMA |
1a2db300 | 470 | * |
b1ce45e8 | 471 | * Try each configured NUMA initialization method until one succeeds. The |
9a747c91 | 472 | * last fallback is dummy single node config encompassing whole memory. |
1a2db300 | 473 | */ |
eb75541f | 474 | void __init arch_numa_init(void) |
1a2db300 GK |
475 | { |
476 | if (!numa_off) { | |
eb75541f | 477 | if (!acpi_disabled && !numa_init(arch_acpi_numa_init)) |
d8b47fca HG |
478 | return; |
479 | if (acpi_disabled && !numa_init(of_numa_init)) | |
1a2db300 GK |
480 | return; |
481 | } | |
482 | ||
483 | numa_init(dummy_numa_init); | |
484 | } |