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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/sections.h>
17
18struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
19EXPORT_SYMBOL(node_data);
20nodemask_t numa_nodes_parsed __initdata;
21static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };
22
23static int numa_distance_cnt;
24static u8 *numa_distance;
25bool numa_off;
26
27static __init int numa_parse_early_param(char *opt)
28{
29 if (!opt)
30 return -EINVAL;
31 if (str_has_prefix(opt, "off"))
32 numa_off = true;
33
34 return 0;
35}
36early_param("numa", numa_parse_early_param);
37
38cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
39EXPORT_SYMBOL(node_to_cpumask_map);
40
41#ifdef CONFIG_DEBUG_PER_CPU_MAPS
42
43
44
45
46const struct cpumask *cpumask_of_node(int node)
47{
48
49 if (node == NUMA_NO_NODE)
50 return cpu_all_mask;
51
52 if (WARN_ON(node < 0 || node >= nr_node_ids))
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}
60EXPORT_SYMBOL(cpumask_of_node);
61
62#endif
63
64static void numa_update_cpu(unsigned int cpu, bool remove)
65{
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
74 cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
75}
76
77void numa_add_cpu(unsigned int cpu)
78{
79 numa_update_cpu(cpu, false);
80}
81
82void numa_remove_cpu(unsigned int cpu)
83{
84 numa_update_cpu(cpu, true);
85}
86
87void numa_clear_node(unsigned int cpu)
88{
89 numa_remove_cpu(cpu);
90 set_cpu_numa_node(cpu, NUMA_NO_NODE);
91}
92
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97
98
99
100static void __init setup_node_to_cpumask_map(void)
101{
102 int node;
103
104
105 if (nr_node_ids == MAX_NUMNODES)
106 setup_nr_node_ids();
107
108
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
114
115 pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
116}
117
118
119
120
121void numa_store_cpu_info(unsigned int cpu)
122{
123 set_cpu_numa_node(cpu, cpu_to_node_map[cpu]);
124}
125
126void __init early_map_cpu_to_node(unsigned int cpu, int nid)
127{
128
129 if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
130 nid = 0;
131
132 cpu_to_node_map[cpu] = nid;
133
134
135
136
137
138
139 if (!cpu)
140 set_cpu_numa_node(cpu, nid);
141}
142
143#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
144unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
145EXPORT_SYMBOL(__per_cpu_offset);
146
147static int __init early_cpu_to_node(int cpu)
148{
149 return cpu_to_node_map[cpu];
150}
151
152static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
153{
154 return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
155}
156
157static 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
162 return memblock_alloc_try_nid(size, align,
163 __pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid);
164}
165
166static void __init pcpu_fc_free(void *ptr, size_t size)
167{
168 memblock_free_early(__pa(ptr), size);
169}
170
171void __init setup_per_cpu_areas(void)
172{
173 unsigned long delta;
174 unsigned int cpu;
175 int rc;
176
177
178
179
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
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201
202
203int __init numa_add_memblk(int nid, u64 start, u64 end)
204{
205 int ret;
206
207 ret = memblock_set_node(start, (end - start), &memblock.memory, nid);
208 if (ret < 0) {
209 pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n",
210 start, (end - 1), nid);
211 return ret;
212 }
213
214 node_set(nid, numa_nodes_parsed);
215 return ret;
216}
217
218
219
220
221static 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
228 if (start_pfn >= end_pfn)
229 pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
230
231 nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
232 if (!nd_pa)
233 panic("Cannot allocate %zu bytes for node %d data\n",
234 nd_size, nid);
235
236 nd = __va(nd_pa);
237
238
239 pr_info("NODE_DATA [mem %#010Lx-%#010Lx]\n",
240 nd_pa, nd_pa + nd_size - 1);
241 tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
242 if (tnid != nid)
243 pr_info("NODE_DATA(%d) on node %d\n", nid, tnid);
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
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255
256
257void __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_ptr(numa_distance, size);
268 numa_distance_cnt = 0;
269 numa_distance = NULL;
270}
271
272
273
274
275static 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_phys_alloc_range(size, PAGE_SIZE, 0, PFN_PHYS(max_pfn));
283 if (WARN_ON(!phys))
284 return -ENOMEM;
285
286 numa_distance = __va(phys);
287 numa_distance_cnt = nr_node_ids;
288
289
290 for (i = 0; i < numa_distance_cnt; i++)
291 for (j = 0; j < numa_distance_cnt; j++)
292 numa_distance[i * numa_distance_cnt + j] = i == j ?
293 LOCAL_DISTANCE : REMOTE_DISTANCE;
294
295 pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt);
296
297 return 0;
298}
299
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310
311
312void __init numa_set_distance(int from, int to, int distance)
313{
314 if (!numa_distance) {
315 pr_warn_once("Warning: distance table not allocated yet\n");
316 return;
317 }
318
319 if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
320 from < 0 || to < 0) {
321 pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
322 from, to, distance);
323 return;
324 }
325
326 if ((u8)distance != distance ||
327 (from == to && distance != LOCAL_DISTANCE)) {
328 pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
329 from, to, distance);
330 return;
331 }
332
333 numa_distance[from * numa_distance_cnt + to] = distance;
334}
335
336
337
338
339int __node_distance(int from, int to)
340{
341 if (from >= numa_distance_cnt || to >= numa_distance_cnt)
342 return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
343 return numa_distance[from * numa_distance_cnt + to];
344}
345EXPORT_SYMBOL(__node_distance);
346
347static int __init numa_register_nodes(void)
348{
349 int nid;
350 struct memblock_region *mblk;
351
352
353 for_each_mem_region(mblk) {
354 int mblk_nid = memblock_get_region_node(mblk);
355 phys_addr_t start = mblk->base;
356 phys_addr_t end = mblk->base + mblk->size - 1;
357
358 if (mblk_nid == NUMA_NO_NODE || mblk_nid >= MAX_NUMNODES) {
359 pr_warn("Warning: invalid memblk node %d [mem %pap-%pap]\n",
360 mblk_nid, &start, &end);
361 return -EINVAL;
362 }
363 }
364
365
366 for_each_node_mask(nid, numa_nodes_parsed) {
367 unsigned long start_pfn, end_pfn;
368
369 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
370 setup_node_data(nid, start_pfn, end_pfn);
371 node_set_online(nid);
372 }
373
374
375 node_possible_map = numa_nodes_parsed;
376
377 return 0;
378}
379
380static int __init numa_init(int (*init_func)(void))
381{
382 int ret;
383
384 nodes_clear(numa_nodes_parsed);
385 nodes_clear(node_possible_map);
386 nodes_clear(node_online_map);
387
388 ret = numa_alloc_distance();
389 if (ret < 0)
390 return ret;
391
392 ret = init_func();
393 if (ret < 0)
394 goto out_free_distance;
395
396 if (nodes_empty(numa_nodes_parsed)) {
397 pr_info("No NUMA configuration found\n");
398 ret = -EINVAL;
399 goto out_free_distance;
400 }
401
402 ret = numa_register_nodes();
403 if (ret < 0)
404 goto out_free_distance;
405
406 setup_node_to_cpumask_map();
407
408 return 0;
409out_free_distance:
410 numa_free_distance();
411 return ret;
412}
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424
425static int __init dummy_numa_init(void)
426{
427 phys_addr_t start = memblock_start_of_DRAM();
428 phys_addr_t end = memblock_end_of_DRAM() - 1;
429 int ret;
430
431 if (numa_off)
432 pr_info("NUMA disabled\n");
433 pr_info("Faking a node at [mem %pap-%pap]\n", &start, &end);
434
435 ret = numa_add_memblk(0, start, end + 1);
436 if (ret) {
437 pr_err("NUMA init failed\n");
438 return ret;
439 }
440
441 numa_off = true;
442 return 0;
443}
444
445#ifdef CONFIG_ACPI_NUMA
446static int __init arch_acpi_numa_init(void)
447{
448 int ret;
449
450 ret = acpi_numa_init();
451 if (ret) {
452 pr_info("Failed to initialise from firmware\n");
453 return ret;
454 }
455
456 return srat_disabled() ? -EINVAL : 0;
457}
458#else
459static int __init arch_acpi_numa_init(void)
460{
461 return -EOPNOTSUPP;
462}
463#endif
464
465
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468
469
470
471void __init arch_numa_init(void)
472{
473 if (!numa_off) {
474 if (!acpi_disabled && !numa_init(arch_acpi_numa_init))
475 return;
476 if (acpi_disabled && !numa_init(of_numa_init))
477 return;
478 }
479
480 numa_init(dummy_numa_init);
481}
482