aboutsummaryrefslogtreecommitdiff
path: root/arch/arm64/mm/numa.c
blob: 0bff116c07a881f9bba9bc55d2bb1681bbe7ea63 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
/*
 * NUMA support, based on the x86 implementation.
 *
 * Copyright (C) 2015 Cavium Inc.
 * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#define pr_fmt(fmt) "NUMA: " fmt

#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/module.h>
#include <linux/of.h>

#include <asm/acpi.h>
#include <asm/sections.h>

struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
EXPORT_SYMBOL(node_data);
nodemask_t numa_nodes_parsed __initdata;
static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };

static int numa_distance_cnt;
static u8 *numa_distance;
bool numa_off;

static __init int numa_parse_early_param(char *opt)
{
	if (!opt)
		return -EINVAL;
	if (!strncmp(opt, "off", 3))
		numa_off = true;

	return 0;
}
early_param("numa", numa_parse_early_param);

cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
EXPORT_SYMBOL(node_to_cpumask_map);

#ifdef CONFIG_DEBUG_PER_CPU_MAPS

/*
 * Returns a pointer to the bitmask of CPUs on Node 'node'.
 */
const struct cpumask *cpumask_of_node(int node)
{
	if (WARN_ON(node >= nr_node_ids))
		return cpu_none_mask;

	if (WARN_ON(node_to_cpumask_map[node] == NULL))
		return cpu_online_mask;

	return node_to_cpumask_map[node];
}
EXPORT_SYMBOL(cpumask_of_node);

#endif

static void numa_update_cpu(unsigned int cpu, bool remove)
{
	int nid = cpu_to_node(cpu);

	if (nid == NUMA_NO_NODE)
		return;

	if (remove)
		cpumask_clear_cpu(cpu, node_to_cpumask_map[nid]);
	else
		cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
}

void numa_add_cpu(unsigned int cpu)
{
	numa_update_cpu(cpu, false);
}

void numa_remove_cpu(unsigned int cpu)
{
	numa_update_cpu(cpu, true);
}

void numa_clear_node(unsigned int cpu)
{
	numa_remove_cpu(cpu);
	set_cpu_numa_node(cpu, NUMA_NO_NODE);
}

/*
 * Allocate node_to_cpumask_map based on number of available nodes
 * Requires node_possible_map to be valid.
 *
 * Note: cpumask_of_node() is not valid until after this is done.
 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
 */
static void __init setup_node_to_cpumask_map(void)
{
	int node;

	/* setup nr_node_ids if not done yet */
	if (nr_node_ids == MAX_NUMNODES)
		setup_nr_node_ids();

	/* allocate and clear the mapping */
	for (node = 0; node < nr_node_ids; node++) {
		alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
		cpumask_clear(node_to_cpumask_map[node]);
	}

	/* cpumask_of_node() will now work */
	pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids);
}

/*
 *  Set the cpu to node and mem mapping
 */
void numa_store_cpu_info(unsigned int cpu)
{
	set_cpu_numa_node(cpu, cpu_to_node_map[cpu]);
}

void __init early_map_cpu_to_node(unsigned int cpu, int nid)
{
	/* fallback to node 0 */
	if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
		nid = 0;

	cpu_to_node_map[cpu] = nid;

	/*
	 * We should set the numa node of cpu0 as soon as possible, because it
	 * has already been set up online before. cpu_to_node(0) will soon be
	 * called.
	 */
	if (!cpu)
		set_cpu_numa_node(cpu, nid);
}

#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(__per_cpu_offset);

static int __init early_cpu_to_node(int cpu)
{
	return cpu_to_node_map[cpu];
}

static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
{
	return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
}

static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size,
				       size_t align)
{
	int nid = early_cpu_to_node(cpu);

	return  memblock_alloc_try_nid(size, align,
			__pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid);
}

static void __init pcpu_fc_free(void *ptr, size_t size)
{
	memblock_free_early(__pa(ptr), size);
}

void __init setup_per_cpu_areas(void)
{
	unsigned long delta;
	unsigned int cpu;
	int rc;

	/*
	 * Always reserve area for module percpu variables.  That's
	 * what the legacy allocator did.
	 */
	rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
				    PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
				    pcpu_cpu_distance,
				    pcpu_fc_alloc, pcpu_fc_free);
	if (rc < 0)
		panic("Failed to initialize percpu areas.");

	delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
	for_each_possible_cpu(cpu)
		__per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
}
#endif

/**
 * numa_add_memblk - Set node id to memblk
 * @nid: NUMA node ID of the new memblk
 * @start: Start address of the new memblk
 * @end:  End address of the new memblk
 *
 * RETURNS:
 * 0 on success, -errno on failure.
 */
int __init numa_add_memblk(int nid, u64 start, u64 end)
{
	int ret;

	ret = memblock_set_node(start, (end - start), &memblock.memory, nid);
	if (ret < 0) {
		pr_err("memblock [0x%llx - 0x%llx] failed to add on node %d\n",
			start, (end - 1), nid);
		return ret;
	}

	node_set(nid, numa_nodes_parsed);
	return ret;
}

/**
 * Initialize NODE_DATA for a node on the local memory
 */
static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
{
	const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
	u64 nd_pa;
	void *nd;
	int tnid;

	if (start_pfn >= end_pfn)
		pr_info("Initmem setup node %d [<memory-less node>]\n", nid);

	nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
	nd = __va(nd_pa);

	/* report and initialize */
	pr_info("NODE_DATA [mem %#010Lx-%#010Lx]\n",
		nd_pa, nd_pa + nd_size - 1);
	tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
	if (tnid != nid)
		pr_info("NODE_DATA(%d) on node %d\n", nid, tnid);

	node_data[nid] = nd;
	memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
	NODE_DATA(nid)->node_id = nid;
	NODE_DATA(nid)->node_start_pfn = start_pfn;
	NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
}

/**
 * numa_free_distance
 *
 * The current table is freed.
 */
void __init numa_free_distance(void)
{
	size_t size;

	if (!numa_distance)
		return;

	size = numa_distance_cnt * numa_distance_cnt *
		sizeof(numa_distance[0]);

	memblock_free(__pa(numa_distance), size);
	numa_distance_cnt = 0;
	numa_distance = NULL;
}

/**
 *
 * Create a new NUMA distance table.
 *
 */
static int __init numa_alloc_distance(void)
{
	size_t size;
	u64 phys;
	int i, j;

	size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
	phys = memblock_find_in_range(0, PFN_PHYS(max_pfn),
				      size, PAGE_SIZE);
	if (WARN_ON(!phys))
		return -ENOMEM;

	memblock_reserve(phys, size);

	numa_distance = __va(phys);
	numa_distance_cnt = nr_node_ids;

	/* fill with the default distances */
	for (i = 0; i < numa_distance_cnt; i++)
		for (j = 0; j < numa_distance_cnt; j++)
			numa_distance[i * numa_distance_cnt + j] = i == j ?
				LOCAL_DISTANCE : REMOTE_DISTANCE;

	pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt);

	return 0;
}

/**
 * numa_set_distance - Set inter node NUMA distance from node to node.
 * @from: the 'from' node to set distance
 * @to: the 'to'  node to set distance
 * @distance: NUMA distance
 *
 * Set the distance from node @from to @to to @distance.
 * If distance table doesn't exist, a warning is printed.
 *
 * If @from or @to is higher than the highest known node or lower than zero
 * or @distance doesn't make sense, the call is ignored.
 *
 */
void __init numa_set_distance(int from, int to, int distance)
{
	if (!numa_distance) {
		pr_warn_once("Warning: distance table not allocated yet\n");
		return;
	}

	if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
			from < 0 || to < 0) {
		pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
			    from, to, distance);
		return;
	}

	if ((u8)distance != distance ||
	    (from == to && distance != LOCAL_DISTANCE)) {
		pr_warn_once("Warning: invalid distance parameter, from=%d to=%d distance=%d\n",
			     from, to, distance);
		return;
	}

	numa_distance[from * numa_distance_cnt + to] = distance;
}

/**
 * Return NUMA distance @from to @to
 */
int __node_distance(int from, int to)
{
	if (from >= numa_distance_cnt || to >= numa_distance_cnt)
		return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
	return numa_distance[from * numa_distance_cnt + to];
}
EXPORT_SYMBOL(__node_distance);

static int __init numa_register_nodes(void)
{
	int nid;
	struct memblock_region *mblk;

	/* Check that valid nid is set to memblks */
	for_each_memblock(memory, mblk)
		if (mblk->nid == NUMA_NO_NODE || mblk->nid >= MAX_NUMNODES) {
			pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
				mblk->nid, mblk->base,
				mblk->base + mblk->size - 1);
			return -EINVAL;
		}

	/* Finally register nodes. */
	for_each_node_mask(nid, numa_nodes_parsed) {
		unsigned long start_pfn, end_pfn;

		get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
		setup_node_data(nid, start_pfn, end_pfn);
		node_set_online(nid);
	}

	/* Setup online nodes to actual nodes*/
	node_possible_map = numa_nodes_parsed;

	return 0;
}

static int __init numa_init(int (*init_func)(void))
{
	int ret;

	nodes_clear(numa_nodes_parsed);
	nodes_clear(node_possible_map);
	nodes_clear(node_online_map);

	ret = numa_alloc_distance();
	if (ret < 0)
		return ret;

	ret = init_func();
	if (ret < 0)
		goto out_free_distance;

	if (nodes_empty(numa_nodes_parsed)) {
		pr_info("No NUMA configuration found\n");
		ret = -EINVAL;
		goto out_free_distance;
	}

	ret = numa_register_nodes();
	if (ret < 0)
		goto out_free_distance;

	setup_node_to_cpumask_map();

	return 0;
out_free_distance:
	numa_free_distance();
	return ret;
}

/**
 * dummy_numa_init - Fallback dummy NUMA init
 *
 * Used if there's no underlying NUMA architecture, NUMA initialization
 * fails, or NUMA is disabled on the command line.
 *
 * Must online at least one node (node 0) and add memory blocks that cover all
 * allowed memory. It is unlikely that this function fails.
 */
static int __init dummy_numa_init(void)
{
	int ret;
	struct memblock_region *mblk;

	if (numa_off)
		pr_info("NUMA disabled\n"); /* Forced off on command line. */
	pr_info("Faking a node at [mem %#018Lx-%#018Lx]\n",
		memblock_start_of_DRAM(), memblock_end_of_DRAM() - 1);

	for_each_memblock(memory, mblk) {
		ret = numa_add_memblk(0, mblk->base, mblk->base + mblk->size);
		if (!ret)
			continue;

		pr_err("NUMA init failed\n");
		return ret;
	}

	numa_off = true;
	return 0;
}

/**
 * arm64_numa_init - Initialize NUMA
 *
 * Try each configured NUMA initialization method until one succeeds.  The
 * last fallback is dummy single node config encomapssing whole memory.
 */
void __init arm64_numa_init(void)
{
	if (!numa_off) {
		if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))
			return;
		if (acpi_disabled && !numa_init(of_numa_init))
			return;
	}

	numa_init(dummy_numa_init);
}