aboutsummaryrefslogtreecommitdiff
path: root/arch/x86_64/mm/numa.c
blob: 876e343744128f57d10b6ea2c70165da3cf62e64 (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
/* 
 * Generic VM initialization for x86-64 NUMA setups.
 * Copyright 2002,2003 Andi Kleen, SuSE Labs.
 */ 
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mmzone.h>
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/nodemask.h>

#include <asm/e820.h>
#include <asm/proto.h>
#include <asm/dma.h>
#include <asm/numa.h>
#include <asm/acpi.h>

#ifndef Dprintk
#define Dprintk(x...)
#endif

struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
bootmem_data_t plat_node_bdata[MAX_NUMNODES];

int memnode_shift;
u8  memnodemap[NODEMAPSIZE];

unsigned char cpu_to_node[NR_CPUS] __read_mostly = {
	[0 ... NR_CPUS-1] = NUMA_NO_NODE
};
unsigned char apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
 	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
};
cpumask_t node_to_cpumask[MAX_NUMNODES] __read_mostly;

int numa_off __initdata;


/*
 * Given a shift value, try to populate memnodemap[]
 * Returns :
 * 1 if OK
 * 0 if memnodmap[] too small (of shift too small)
 * -1 if node overlap or lost ram (shift too big)
 */
static int __init
populate_memnodemap(const struct node *nodes, int numnodes, int shift)
{
	int i; 
	int res = -1;
	unsigned long addr, end;

	if (shift >= 64)
		return -1;
	memset(memnodemap, 0xff, sizeof(memnodemap));
	for (i = 0; i < numnodes; i++) {
		addr = nodes[i].start;
		end = nodes[i].end;
		if (addr >= end)
			continue;
		if ((end >> shift) >= NODEMAPSIZE)
			return 0;
		do {
			if (memnodemap[addr >> shift] != 0xff)
				return -1;
			memnodemap[addr >> shift] = i;
                       addr += (1UL << shift);
		} while (addr < end);
		res = 1;
	} 
	return res;
}

int __init compute_hash_shift(struct node *nodes, int numnodes)
{
	int shift = 20;

	while (populate_memnodemap(nodes, numnodes, shift + 1) >= 0)
		shift++;

	printk(KERN_DEBUG "NUMA: Using %d for the hash shift.\n",
		shift);

	if (populate_memnodemap(nodes, numnodes, shift) != 1) {
		printk(KERN_INFO
	"Your memory is not aligned you need to rebuild your kernel "
	"with a bigger NODEMAPSIZE shift=%d\n",
			shift);
		return -1;
	}
	return shift;
}

#ifdef CONFIG_SPARSEMEM
int early_pfn_to_nid(unsigned long pfn)
{
	return phys_to_nid(pfn << PAGE_SHIFT);
}
#endif

/* Initialize bootmem allocator for a node */
void __init setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
{ 
	unsigned long start_pfn, end_pfn, bootmap_pages, bootmap_size, bootmap_start; 
	unsigned long nodedata_phys;
	const int pgdat_size = round_up(sizeof(pg_data_t), PAGE_SIZE);

	start = round_up(start, ZONE_ALIGN); 

	printk(KERN_INFO "Bootmem setup node %d %016lx-%016lx\n", nodeid, start, end);

	start_pfn = start >> PAGE_SHIFT;
	end_pfn = end >> PAGE_SHIFT;

	nodedata_phys = find_e820_area(start, end, pgdat_size); 
	if (nodedata_phys == -1L) 
		panic("Cannot find memory pgdat in node %d\n", nodeid);

	Dprintk("nodedata_phys %lx\n", nodedata_phys); 

	node_data[nodeid] = phys_to_virt(nodedata_phys);
	memset(NODE_DATA(nodeid), 0, sizeof(pg_data_t));
	NODE_DATA(nodeid)->bdata = &plat_node_bdata[nodeid];
	NODE_DATA(nodeid)->node_start_pfn = start_pfn;
	NODE_DATA(nodeid)->node_spanned_pages = end_pfn - start_pfn;

	/* Find a place for the bootmem map */
	bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 
	bootmap_start = round_up(nodedata_phys + pgdat_size, PAGE_SIZE);
	bootmap_start = find_e820_area(bootmap_start, end, bootmap_pages<<PAGE_SHIFT);
	if (bootmap_start == -1L) 
		panic("Not enough continuous space for bootmap on node %d", nodeid); 
	Dprintk("bootmap start %lu pages %lu\n", bootmap_start, bootmap_pages); 
	
	bootmap_size = init_bootmem_node(NODE_DATA(nodeid),
					 bootmap_start >> PAGE_SHIFT, 
					 start_pfn, end_pfn); 

	e820_bootmem_free(NODE_DATA(nodeid), start, end);

	reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys, pgdat_size); 
	reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start, bootmap_pages<<PAGE_SHIFT);
	node_set_online(nodeid);
} 

/* Initialize final allocator for a zone */
void __init setup_node_zones(int nodeid)
{ 
	unsigned long start_pfn, end_pfn; 
	unsigned long zones[MAX_NR_ZONES];
	unsigned long holes[MAX_NR_ZONES];

 	start_pfn = node_start_pfn(nodeid);
 	end_pfn = node_end_pfn(nodeid);

	Dprintk(KERN_INFO "Setting up node %d %lx-%lx\n",
		nodeid, start_pfn, end_pfn);

	size_zones(zones, holes, start_pfn, end_pfn);
	free_area_init_node(nodeid, NODE_DATA(nodeid), zones,
			    start_pfn, holes);
} 

void __init numa_init_array(void)
{
	int rr, i;
	/* There are unfortunately some poorly designed mainboards around
	   that only connect memory to a single CPU. This breaks the 1:1 cpu->node
	   mapping. To avoid this fill in the mapping for all possible
	   CPUs, as the number of CPUs is not known yet. 
	   We round robin the existing nodes. */
	rr = first_node(node_online_map);
	for (i = 0; i < NR_CPUS; i++) {
		if (cpu_to_node[i] != NUMA_NO_NODE)
			continue;
 		numa_set_node(i, rr);
		rr = next_node(rr, node_online_map);
		if (rr == MAX_NUMNODES)
			rr = first_node(node_online_map);
	}

}

#ifdef CONFIG_NUMA_EMU
int numa_fake __initdata = 0;

/* Numa emulation */
static int numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
{
 	int i;
 	struct node nodes[MAX_NUMNODES];
 	unsigned long sz = ((end_pfn - start_pfn)<<PAGE_SHIFT) / numa_fake;

 	/* Kludge needed for the hash function */
 	if (hweight64(sz) > 1) {
 		unsigned long x = 1;
 		while ((x << 1) < sz)
 			x <<= 1;
 		if (x < sz/2)
 			printk(KERN_ERR "Numa emulation unbalanced. Complain to maintainer\n");
 		sz = x;
 	}

 	memset(&nodes,0,sizeof(nodes));
 	for (i = 0; i < numa_fake; i++) {
 		nodes[i].start = (start_pfn<<PAGE_SHIFT) + i*sz;
 		if (i == numa_fake-1)
 			sz = (end_pfn<<PAGE_SHIFT) - nodes[i].start;
 		nodes[i].end = nodes[i].start + sz;
 		printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n",
 		       i,
 		       nodes[i].start, nodes[i].end,
 		       (nodes[i].end - nodes[i].start) >> 20);
		node_set_online(i);
 	}
 	memnode_shift = compute_hash_shift(nodes, numa_fake);
 	if (memnode_shift < 0) {
 		memnode_shift = 0;
 		printk(KERN_ERR "No NUMA hash function found. Emulation disabled.\n");
 		return -1;
 	}
 	for_each_online_node(i)
 		setup_node_bootmem(i, nodes[i].start, nodes[i].end);
 	numa_init_array();
 	return 0;
}
#endif

void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
{ 
	int i;

#ifdef CONFIG_NUMA_EMU
	if (numa_fake && !numa_emulation(start_pfn, end_pfn))
 		return;
#endif

#ifdef CONFIG_ACPI_NUMA
	if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT,
					  end_pfn << PAGE_SHIFT))
 		return;
#endif

#ifdef CONFIG_K8_NUMA
	if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT))
		return;
#endif
	printk(KERN_INFO "%s\n",
	       numa_off ? "NUMA turned off" : "No NUMA configuration found");

	printk(KERN_INFO "Faking a node at %016lx-%016lx\n", 
	       start_pfn << PAGE_SHIFT,
	       end_pfn << PAGE_SHIFT); 
		/* setup dummy node covering all memory */ 
	memnode_shift = 63; 
	memnodemap[0] = 0;
	nodes_clear(node_online_map);
	node_set_online(0);
	for (i = 0; i < NR_CPUS; i++)
		numa_set_node(i, 0);
	node_to_cpumask[0] = cpumask_of_cpu(0);
	setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
}

__cpuinit void numa_add_cpu(int cpu)
{
	set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]);
} 

void __cpuinit numa_set_node(int cpu, int node)
{
	cpu_pda[cpu].nodenumber = node;
	cpu_to_node[cpu] = node;
}

unsigned long __init numa_free_all_bootmem(void) 
{ 
	int i;
	unsigned long pages = 0;
	for_each_online_node(i) {
		pages += free_all_bootmem_node(NODE_DATA(i));
	}
	return pages;
} 

#ifdef CONFIG_SPARSEMEM
static void __init arch_sparse_init(void)
{
	int i;

	for_each_online_node(i)
		memory_present(i, node_start_pfn(i), node_end_pfn(i));

	sparse_init();
}
#else
#define arch_sparse_init() do {} while (0)
#endif

void __init paging_init(void)
{ 
	int i;

	arch_sparse_init();

	for_each_online_node(i) {
		setup_node_zones(i); 
	}
} 

/* [numa=off] */
__init int numa_setup(char *opt) 
{ 
	if (!strncmp(opt,"off",3))
		numa_off = 1;
#ifdef CONFIG_NUMA_EMU
	if(!strncmp(opt, "fake=", 5)) {
		numa_fake = simple_strtoul(opt+5,NULL,0); ;
		if (numa_fake >= MAX_NUMNODES)
			numa_fake = MAX_NUMNODES;
	}
#endif
#ifdef CONFIG_ACPI_NUMA
 	if (!strncmp(opt,"noacpi",6))
 		acpi_numa = -1;
#endif
	return 1;
} 

/*
 * Setup early cpu_to_node.
 *
 * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
 * and apicid_to_node[] tables have valid entries for a CPU.
 * This means we skip cpu_to_node[] initialisation for NUMA
 * emulation and faking node case (when running a kernel compiled
 * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
 * is already initialized in a round robin manner at numa_init_array,
 * prior to this call, and this initialization is good enough
 * for the fake NUMA cases.
 */
void __init init_cpu_to_node(void)
{
	int i;
 	for (i = 0; i < NR_CPUS; i++) {
		u8 apicid = x86_cpu_to_apicid[i];
		if (apicid == BAD_APICID)
			continue;
		if (apicid_to_node[apicid] == NUMA_NO_NODE)
			continue;
 		cpu_to_node[i] = apicid_to_node[apicid];
	}
}

EXPORT_SYMBOL(cpu_to_node);
EXPORT_SYMBOL(node_to_cpumask);
EXPORT_SYMBOL(memnode_shift);
EXPORT_SYMBOL(memnodemap);
EXPORT_SYMBOL(node_data);