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8
9#define pr_fmt(fmt) "NUMA: " fmt
10
11#include <linux/acpi.h>
12#include <linux/memblock.h>
13#include <linux/module.h>
14#include <linux/of.h>
15
16#include <asm/acpi.h>
17#include <asm/sections.h>
18
19struct 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;
26bool numa_off;
27
28static __init int numa_parse_early_param(char *opt)
29{
30 if (!opt)
31 return -EINVAL;
32 if (str_has_prefix(opt, "off"))
33 numa_off = true;
34
35 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
46
47const struct cpumask *cpumask_of_node(int node)
48{
49
50 if (node == NUMA_NO_NODE)
51 return cpu_all_mask;
52
53 if (WARN_ON(node < 0 || node >= nr_node_ids))
54 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
65static void numa_update_cpu(unsigned int cpu, bool remove)
66{
67 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
75 cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
76}
77
78void 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
88void numa_clear_node(unsigned int cpu)
89{
90 numa_remove_cpu(cpu);
91 set_cpu_numa_node(cpu, NUMA_NO_NODE);
92}
93
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99
100
101static void __init setup_node_to_cpumask_map(void)
102{
103 int node;
104
105
106 if (nr_node_ids == MAX_NUMNODES)
107 setup_nr_node_ids();
108
109
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
115
116 pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
117}
118
119
120
121
122void numa_store_cpu_info(unsigned int cpu)
123{
124 set_cpu_numa_node(cpu, cpu_to_node_map[cpu]);
125}
126
127void __init early_map_cpu_to_node(unsigned int cpu, int nid)
128{
129
130 if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
131 nid = 0;
132
133 cpu_to_node_map[cpu] = nid;
134
135
136
137
138
139
140 if (!cpu)
141 set_cpu_numa_node(cpu, nid);
142}
143
144#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{
155 return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
156}
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
163 return memblock_alloc_try_nid(size, align,
164 __pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid);
165}
166
167static void __init pcpu_fc_free(void *ptr, size_t size)
168{
169 memblock_free_early(__pa(ptr), size);
170}
171
172void __init setup_per_cpu_areas(void)
173{
174 unsigned long delta;
175 unsigned int cpu;
176 int rc;
177
178
179
180
181
182 rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
183 PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
184 pcpu_cpu_distance,
185 pcpu_fc_alloc, pcpu_fc_free);
186 if (rc < 0)
187 panic("Failed to initialize percpu areas.");
188
189 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
190 for_each_possible_cpu(cpu)
191 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
192}
193#endif
194
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202
203
204int __init numa_add_memblk(int nid, u64 start, u64 end)
205{
206 int ret;
207
208 ret = memblock_set_node(start, (end - start), &memblock.memory, nid);
209 if (ret < 0) {
210 pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n",
211 start, (end - 1), nid);
212 return ret;
213 }
214
215 node_set(nid, numa_nodes_parsed);
216 return ret;
217}
218
219
220
221
222static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
223{
224 const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
225 u64 nd_pa;
226 void *nd;
227 int tnid;
228
229 if (start_pfn >= end_pfn)
230 pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
231
232 nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
233 if (!nd_pa)
234 panic("Cannot allocate %zu bytes for node %d data\n",
235 nd_size, nid);
236
237 nd = __va(nd_pa);
238
239
240 pr_info("NODE_DATA [mem %#010Lx-%#010Lx]\n",
241 nd_pa, nd_pa + nd_size - 1);
242 tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
243 if (tnid != nid)
244 pr_info("NODE_DATA(%d) on node %d\n", nid, tnid);
245
246 node_data[nid] = nd;
247 memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
248 NODE_DATA(nid)->node_id = nid;
249 NODE_DATA(nid)->node_start_pfn = start_pfn;
250 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
251}
252
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256
257
258void __init numa_free_distance(void)
259{
260 size_t size;
261
262 if (!numa_distance)
263 return;
264
265 size = numa_distance_cnt * numa_distance_cnt *
266 sizeof(numa_distance[0]);
267
268 memblock_free(__pa(numa_distance), size);
269 numa_distance_cnt = 0;
270 numa_distance = NULL;
271}
272
273
274
275
276static int __init numa_alloc_distance(void)
277{
278 size_t size;
279 u64 phys;
280 int i, j;
281
282 size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
283 phys = memblock_find_in_range(0, PFN_PHYS(max_pfn),
284 size, PAGE_SIZE);
285 if (WARN_ON(!phys))
286 return -ENOMEM;
287
288 memblock_reserve(phys, size);
289
290 numa_distance = __va(phys);
291 numa_distance_cnt = nr_node_ids;
292
293
294 for (i = 0; i < numa_distance_cnt; i++)
295 for (j = 0; j < numa_distance_cnt; j++)
296 numa_distance[i * numa_distance_cnt + j] = i == j ?
297 LOCAL_DISTANCE : REMOTE_DISTANCE;
298
299 pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt);
300
301 return 0;
302}
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314
315
316void __init numa_set_distance(int from, int to, int distance)
317{
318 if (!numa_distance) {
319 pr_warn_once("Warning: distance table not allocated yet\n");
320 return;
321 }
322
323 if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
324 from < 0 || to < 0) {
325 pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
326 from, to, distance);
327 return;
328 }
329
330 if ((u8)distance != distance ||
331 (from == to && distance != LOCAL_DISTANCE)) {
332 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
333 from, to, distance);
334 return;
335 }
336
337 numa_distance[from * numa_distance_cnt + to] = distance;
338}
339
340
341
342
343int __node_distance(int from, int to)
344{
345 if (from >= numa_distance_cnt || to >= numa_distance_cnt)
346 return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
347 return numa_distance[from * numa_distance_cnt + to];
348}
349EXPORT_SYMBOL(__node_distance);
350
351static int __init numa_register_nodes(void)
352{
353 int nid;
354 struct memblock_region *mblk;
355
356
357 for_each_mem_region(mblk) {
358 int mblk_nid = memblock_get_region_node(mblk);
359
360 if (mblk_nid == NUMA_NO_NODE || mblk_nid >= MAX_NUMNODES) {
361 pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
362 mblk_nid, mblk->base,
363 mblk->base + mblk->size - 1);
364 return -EINVAL;
365 }
366 }
367
368
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
378 node_possible_map = numa_nodes_parsed;
379
380 return 0;
381}
382
383static 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);
390
391 ret = numa_alloc_distance();
392 if (ret < 0)
393 return ret;
394
395 ret = init_func();
396 if (ret < 0)
397 goto out_free_distance;
398
399 if (nodes_empty(numa_nodes_parsed)) {
400 pr_info("No NUMA configuration found\n");
401 ret = -EINVAL;
402 goto out_free_distance;
403 }
404
405 ret = numa_register_nodes();
406 if (ret < 0)
407 goto out_free_distance;
408
409 setup_node_to_cpumask_map();
410
411 return 0;
412out_free_distance:
413 numa_free_distance();
414 return ret;
415}
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427
428static int __init dummy_numa_init(void)
429{
430 phys_addr_t start = memblock_start_of_DRAM();
431 phys_addr_t end = memblock_end_of_DRAM();
432 int ret;
433
434 if (numa_off)
435 pr_info("NUMA disabled\n");
436 pr_info("Faking a node at [mem %#018Lx-%#018Lx]\n", start, end - 1);
437
438 ret = numa_add_memblk(0, start, end);
439 if (ret) {
440 pr_err("NUMA init failed\n");
441 return ret;
442 }
443
444 numa_off = true;
445 return 0;
446}
447
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451
452
453
454void __init arm64_numa_init(void)
455{
456 if (!numa_off) {
457 if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))
458 return;
459 if (acpi_disabled && !numa_init(of_numa_init))
460 return;
461 }
462
463 numa_init(dummy_numa_init);
464}
465