Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic VM initialization for x86-64 NUMA setups. | |
3 | * Copyright 2002,2003 Andi Kleen, SuSE Labs. | |
4 | */ | |
5 | #include <linux/kernel.h> | |
6 | #include <linux/mm.h> | |
7 | #include <linux/string.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/bootmem.h> | |
10 | #include <linux/mmzone.h> | |
11 | #include <linux/ctype.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/nodemask.h> | |
14 | ||
15 | #include <asm/e820.h> | |
16 | #include <asm/proto.h> | |
17 | #include <asm/dma.h> | |
18 | #include <asm/numa.h> | |
19 | #include <asm/acpi.h> | |
20 | ||
21 | #ifndef Dprintk | |
22 | #define Dprintk(x...) | |
23 | #endif | |
24 | ||
6c231b7b | 25 | struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; |
1da177e4 LT |
26 | bootmem_data_t plat_node_bdata[MAX_NUMNODES]; |
27 | ||
28 | int memnode_shift; | |
29 | u8 memnodemap[NODEMAPSIZE]; | |
30 | ||
3f098c26 AK |
31 | unsigned char cpu_to_node[NR_CPUS] __read_mostly = { |
32 | [0 ... NR_CPUS-1] = NUMA_NO_NODE | |
0b07e984 | 33 | }; |
3f098c26 AK |
34 | unsigned char apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = { |
35 | [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE | |
36 | }; | |
37 | cpumask_t node_to_cpumask[MAX_NUMNODES] __read_mostly; | |
1da177e4 LT |
38 | |
39 | int numa_off __initdata; | |
40 | ||
529a3404 ED |
41 | |
42 | /* | |
43 | * Given a shift value, try to populate memnodemap[] | |
44 | * Returns : | |
45 | * 1 if OK | |
46 | * 0 if memnodmap[] too small (of shift too small) | |
47 | * -1 if node overlap or lost ram (shift too big) | |
48 | */ | |
d18ff470 AK |
49 | static int __init |
50 | populate_memnodemap(const struct node *nodes, int numnodes, int shift) | |
1da177e4 LT |
51 | { |
52 | int i; | |
529a3404 ED |
53 | int res = -1; |
54 | unsigned long addr, end; | |
b684664f | 55 | |
8309cf66 ED |
56 | if (shift >= 64) |
57 | return -1; | |
529a3404 | 58 | memset(memnodemap, 0xff, sizeof(memnodemap)); |
b684664f | 59 | for (i = 0; i < numnodes; i++) { |
529a3404 ED |
60 | addr = nodes[i].start; |
61 | end = nodes[i].end; | |
62 | if (addr >= end) | |
b684664f | 63 | continue; |
529a3404 ED |
64 | if ((end >> shift) >= NODEMAPSIZE) |
65 | return 0; | |
66 | do { | |
67 | if (memnodemap[addr >> shift] != 0xff) | |
b684664f | 68 | return -1; |
b684664f | 69 | memnodemap[addr >> shift] = i; |
8309cf66 | 70 | addr += (1UL << shift); |
529a3404 ED |
71 | } while (addr < end); |
72 | res = 1; | |
1da177e4 | 73 | } |
529a3404 ED |
74 | return res; |
75 | } | |
76 | ||
77 | int __init compute_hash_shift(struct node *nodes, int numnodes) | |
78 | { | |
79 | int shift = 20; | |
80 | ||
81 | while (populate_memnodemap(nodes, numnodes, shift + 1) >= 0) | |
82 | shift++; | |
83 | ||
6b050f80 | 84 | printk(KERN_DEBUG "NUMA: Using %d for the hash shift.\n", |
529a3404 ED |
85 | shift); |
86 | ||
87 | if (populate_memnodemap(nodes, numnodes, shift) != 1) { | |
88 | printk(KERN_INFO | |
89 | "Your memory is not aligned you need to rebuild your kernel " | |
90 | "with a bigger NODEMAPSIZE shift=%d\n", | |
91 | shift); | |
92 | return -1; | |
93 | } | |
b684664f | 94 | return shift; |
1da177e4 LT |
95 | } |
96 | ||
bbfceef4 MT |
97 | #ifdef CONFIG_SPARSEMEM |
98 | int early_pfn_to_nid(unsigned long pfn) | |
99 | { | |
100 | return phys_to_nid(pfn << PAGE_SHIFT); | |
101 | } | |
102 | #endif | |
103 | ||
1da177e4 LT |
104 | /* Initialize bootmem allocator for a node */ |
105 | void __init setup_node_bootmem(int nodeid, unsigned long start, unsigned long end) | |
106 | { | |
107 | unsigned long start_pfn, end_pfn, bootmap_pages, bootmap_size, bootmap_start; | |
108 | unsigned long nodedata_phys; | |
109 | const int pgdat_size = round_up(sizeof(pg_data_t), PAGE_SIZE); | |
110 | ||
111 | start = round_up(start, ZONE_ALIGN); | |
112 | ||
6b050f80 | 113 | printk(KERN_INFO "Bootmem setup node %d %016lx-%016lx\n", nodeid, start, end); |
1da177e4 LT |
114 | |
115 | start_pfn = start >> PAGE_SHIFT; | |
116 | end_pfn = end >> PAGE_SHIFT; | |
117 | ||
118 | nodedata_phys = find_e820_area(start, end, pgdat_size); | |
119 | if (nodedata_phys == -1L) | |
120 | panic("Cannot find memory pgdat in node %d\n", nodeid); | |
121 | ||
122 | Dprintk("nodedata_phys %lx\n", nodedata_phys); | |
123 | ||
124 | node_data[nodeid] = phys_to_virt(nodedata_phys); | |
125 | memset(NODE_DATA(nodeid), 0, sizeof(pg_data_t)); | |
126 | NODE_DATA(nodeid)->bdata = &plat_node_bdata[nodeid]; | |
127 | NODE_DATA(nodeid)->node_start_pfn = start_pfn; | |
128 | NODE_DATA(nodeid)->node_spanned_pages = end_pfn - start_pfn; | |
129 | ||
130 | /* Find a place for the bootmem map */ | |
131 | bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
132 | bootmap_start = round_up(nodedata_phys + pgdat_size, PAGE_SIZE); | |
133 | bootmap_start = find_e820_area(bootmap_start, end, bootmap_pages<<PAGE_SHIFT); | |
134 | if (bootmap_start == -1L) | |
135 | panic("Not enough continuous space for bootmap on node %d", nodeid); | |
136 | Dprintk("bootmap start %lu pages %lu\n", bootmap_start, bootmap_pages); | |
137 | ||
138 | bootmap_size = init_bootmem_node(NODE_DATA(nodeid), | |
139 | bootmap_start >> PAGE_SHIFT, | |
140 | start_pfn, end_pfn); | |
141 | ||
142 | e820_bootmem_free(NODE_DATA(nodeid), start, end); | |
143 | ||
144 | reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys, pgdat_size); | |
145 | reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start, bootmap_pages<<PAGE_SHIFT); | |
146 | node_set_online(nodeid); | |
147 | } | |
148 | ||
149 | /* Initialize final allocator for a zone */ | |
150 | void __init setup_node_zones(int nodeid) | |
151 | { | |
152 | unsigned long start_pfn, end_pfn; | |
153 | unsigned long zones[MAX_NR_ZONES]; | |
485761bd | 154 | unsigned long holes[MAX_NR_ZONES]; |
1da177e4 | 155 | |
a2f1b424 AK |
156 | start_pfn = node_start_pfn(nodeid); |
157 | end_pfn = node_end_pfn(nodeid); | |
1da177e4 | 158 | |
6b050f80 | 159 | Dprintk(KERN_INFO "Setting up node %d %lx-%lx\n", |
a2f1b424 | 160 | nodeid, start_pfn, end_pfn); |
1da177e4 | 161 | |
a2f1b424 | 162 | size_zones(zones, holes, start_pfn, end_pfn); |
1da177e4 | 163 | free_area_init_node(nodeid, NODE_DATA(nodeid), zones, |
485761bd | 164 | start_pfn, holes); |
1da177e4 LT |
165 | } |
166 | ||
167 | void __init numa_init_array(void) | |
168 | { | |
169 | int rr, i; | |
170 | /* There are unfortunately some poorly designed mainboards around | |
171 | that only connect memory to a single CPU. This breaks the 1:1 cpu->node | |
172 | mapping. To avoid this fill in the mapping for all possible | |
173 | CPUs, as the number of CPUs is not known yet. | |
174 | We round robin the existing nodes. */ | |
85cc5135 | 175 | rr = first_node(node_online_map); |
1da177e4 LT |
176 | for (i = 0; i < NR_CPUS; i++) { |
177 | if (cpu_to_node[i] != NUMA_NO_NODE) | |
178 | continue; | |
69d81fcd | 179 | numa_set_node(i, rr); |
1da177e4 LT |
180 | rr = next_node(rr, node_online_map); |
181 | if (rr == MAX_NUMNODES) | |
182 | rr = first_node(node_online_map); | |
1da177e4 LT |
183 | } |
184 | ||
1da177e4 LT |
185 | } |
186 | ||
187 | #ifdef CONFIG_NUMA_EMU | |
188 | int numa_fake __initdata = 0; | |
189 | ||
190 | /* Numa emulation */ | |
191 | static int numa_emulation(unsigned long start_pfn, unsigned long end_pfn) | |
192 | { | |
193 | int i; | |
194 | struct node nodes[MAX_NUMNODES]; | |
195 | unsigned long sz = ((end_pfn - start_pfn)<<PAGE_SHIFT) / numa_fake; | |
196 | ||
197 | /* Kludge needed for the hash function */ | |
198 | if (hweight64(sz) > 1) { | |
199 | unsigned long x = 1; | |
200 | while ((x << 1) < sz) | |
201 | x <<= 1; | |
202 | if (x < sz/2) | |
6b050f80 | 203 | printk(KERN_ERR "Numa emulation unbalanced. Complain to maintainer\n"); |
1da177e4 LT |
204 | sz = x; |
205 | } | |
206 | ||
207 | memset(&nodes,0,sizeof(nodes)); | |
208 | for (i = 0; i < numa_fake; i++) { | |
209 | nodes[i].start = (start_pfn<<PAGE_SHIFT) + i*sz; | |
210 | if (i == numa_fake-1) | |
211 | sz = (end_pfn<<PAGE_SHIFT) - nodes[i].start; | |
212 | nodes[i].end = nodes[i].start + sz; | |
1da177e4 LT |
213 | printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n", |
214 | i, | |
215 | nodes[i].start, nodes[i].end, | |
216 | (nodes[i].end - nodes[i].start) >> 20); | |
217 | node_set_online(i); | |
218 | } | |
219 | memnode_shift = compute_hash_shift(nodes, numa_fake); | |
220 | if (memnode_shift < 0) { | |
221 | memnode_shift = 0; | |
222 | printk(KERN_ERR "No NUMA hash function found. Emulation disabled.\n"); | |
223 | return -1; | |
224 | } | |
225 | for_each_online_node(i) | |
226 | setup_node_bootmem(i, nodes[i].start, nodes[i].end); | |
227 | numa_init_array(); | |
228 | return 0; | |
229 | } | |
230 | #endif | |
231 | ||
232 | void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn) | |
233 | { | |
234 | int i; | |
235 | ||
236 | #ifdef CONFIG_NUMA_EMU | |
237 | if (numa_fake && !numa_emulation(start_pfn, end_pfn)) | |
238 | return; | |
239 | #endif | |
240 | ||
241 | #ifdef CONFIG_ACPI_NUMA | |
242 | if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT, | |
243 | end_pfn << PAGE_SHIFT)) | |
244 | return; | |
245 | #endif | |
246 | ||
247 | #ifdef CONFIG_K8_NUMA | |
248 | if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT)) | |
249 | return; | |
250 | #endif | |
251 | printk(KERN_INFO "%s\n", | |
252 | numa_off ? "NUMA turned off" : "No NUMA configuration found"); | |
253 | ||
254 | printk(KERN_INFO "Faking a node at %016lx-%016lx\n", | |
255 | start_pfn << PAGE_SHIFT, | |
256 | end_pfn << PAGE_SHIFT); | |
257 | /* setup dummy node covering all memory */ | |
258 | memnode_shift = 63; | |
259 | memnodemap[0] = 0; | |
260 | nodes_clear(node_online_map); | |
261 | node_set_online(0); | |
262 | for (i = 0; i < NR_CPUS; i++) | |
69d81fcd | 263 | numa_set_node(i, 0); |
1da177e4 LT |
264 | node_to_cpumask[0] = cpumask_of_cpu(0); |
265 | setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT); | |
266 | } | |
267 | ||
e6982c67 | 268 | __cpuinit void numa_add_cpu(int cpu) |
1da177e4 | 269 | { |
e6a045a5 | 270 | set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]); |
1da177e4 LT |
271 | } |
272 | ||
69d81fcd AK |
273 | void __cpuinit numa_set_node(int cpu, int node) |
274 | { | |
275 | cpu_pda[cpu].nodenumber = node; | |
276 | cpu_to_node[cpu] = node; | |
277 | } | |
278 | ||
1da177e4 LT |
279 | unsigned long __init numa_free_all_bootmem(void) |
280 | { | |
281 | int i; | |
282 | unsigned long pages = 0; | |
283 | for_each_online_node(i) { | |
284 | pages += free_all_bootmem_node(NODE_DATA(i)); | |
285 | } | |
286 | return pages; | |
287 | } | |
288 | ||
d3ee871e BP |
289 | #ifdef CONFIG_SPARSEMEM |
290 | static void __init arch_sparse_init(void) | |
291 | { | |
292 | int i; | |
293 | ||
294 | for_each_online_node(i) | |
295 | memory_present(i, node_start_pfn(i), node_end_pfn(i)); | |
296 | ||
297 | sparse_init(); | |
298 | } | |
299 | #else | |
300 | #define arch_sparse_init() do {} while (0) | |
301 | #endif | |
302 | ||
1da177e4 LT |
303 | void __init paging_init(void) |
304 | { | |
305 | int i; | |
d3ee871e BP |
306 | |
307 | arch_sparse_init(); | |
308 | ||
1da177e4 LT |
309 | for_each_online_node(i) { |
310 | setup_node_zones(i); | |
311 | } | |
312 | } | |
313 | ||
314 | /* [numa=off] */ | |
315 | __init int numa_setup(char *opt) | |
316 | { | |
317 | if (!strncmp(opt,"off",3)) | |
318 | numa_off = 1; | |
319 | #ifdef CONFIG_NUMA_EMU | |
320 | if(!strncmp(opt, "fake=", 5)) { | |
321 | numa_fake = simple_strtoul(opt+5,NULL,0); ; | |
322 | if (numa_fake >= MAX_NUMNODES) | |
323 | numa_fake = MAX_NUMNODES; | |
324 | } | |
325 | #endif | |
326 | #ifdef CONFIG_ACPI_NUMA | |
327 | if (!strncmp(opt,"noacpi",6)) | |
328 | acpi_numa = -1; | |
329 | #endif | |
330 | return 1; | |
331 | } | |
332 | ||
333 | EXPORT_SYMBOL(cpu_to_node); | |
334 | EXPORT_SYMBOL(node_to_cpumask); | |
335 | EXPORT_SYMBOL(memnode_shift); | |
336 | EXPORT_SYMBOL(memnodemap); | |
337 | EXPORT_SYMBOL(node_data); |