Merge branch 'linus' into x86/cleanups
[deliverable/linux.git] / arch / x86 / kernel / setup_percpu.c
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1#include <linux/kernel.h>
2#include <linux/module.h>
3#include <linux/init.h>
4#include <linux/bootmem.h>
5#include <linux/percpu.h>
1ecd2765 6#include <linux/kexec.h>
17b4cceb 7#include <linux/crash_dump.h>
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8#include <linux/smp.h>
9#include <linux/topology.h>
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10#include <asm/sections.h>
11#include <asm/processor.h>
12#include <asm/setup.h>
0fc0906e 13#include <asm/mpspec.h>
76eb4131 14#include <asm/apicdef.h>
1ecd2765 15#include <asm/highmem.h>
76eb4131 16
f8955ebe 17#ifdef CONFIG_X86_LOCAL_APIC
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18unsigned int num_processors;
19unsigned disabled_cpus __cpuinitdata;
20/* Processor that is doing the boot up */
21unsigned int boot_cpu_physical_apicid = -1U;
22EXPORT_SYMBOL(boot_cpu_physical_apicid);
8a87dd9a 23unsigned int max_physical_apicid;
2fe60147 24
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25/* Bitmask of physically existing CPUs */
26physid_mask_t phys_cpu_present_map;
f8955ebe 27#endif
0fc0906e 28
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29/* map cpu index to physical APIC ID */
30DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID);
31DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID);
32EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
33EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
34
35#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
36#define X86_64_NUMA 1
37
7891a24e 38/* map cpu index to node index */
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39DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
40EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
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41
42/* which logical CPUs are on which nodes */
43cpumask_t *node_to_cpumask_map;
44EXPORT_SYMBOL(node_to_cpumask_map);
45
46/* setup node_to_cpumask_map */
47static void __init setup_node_to_cpumask_map(void);
48
49#else
50static inline void setup_node_to_cpumask_map(void) { }
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51#endif
52
f8955ebe 53#if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
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54/*
55 * Copy data used in early init routines from the initial arrays to the
56 * per cpu data areas. These arrays then become expendable and the
57 * *_early_ptr's are zeroed indicating that the static arrays are gone.
58 */
59static void __init setup_per_cpu_maps(void)
60{
61 int cpu;
62
63 for_each_possible_cpu(cpu) {
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64 per_cpu(x86_cpu_to_apicid, cpu) =
65 early_per_cpu_map(x86_cpu_to_apicid, cpu);
b447a468 66 per_cpu(x86_bios_cpu_apicid, cpu) =
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67 early_per_cpu_map(x86_bios_cpu_apicid, cpu);
68#ifdef X86_64_NUMA
b447a468 69 per_cpu(x86_cpu_to_node_map, cpu) =
23ca4bba 70 early_per_cpu_map(x86_cpu_to_node_map, cpu);
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71#endif
72 }
73
74 /* indicate the early static arrays will soon be gone */
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75 early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
76 early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
77#ifdef X86_64_NUMA
78 early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
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79#endif
80}
81
82#ifdef CONFIG_X86_32
83/*
84 * Great future not-so-futuristic plan: make i386 and x86_64 do it
85 * the same way
86 */
87unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
88EXPORT_SYMBOL(__per_cpu_offset);
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89static inline void setup_cpu_pda_map(void) { }
90
91#elif !defined(CONFIG_SMP)
92static inline void setup_cpu_pda_map(void) { }
93
94#else /* CONFIG_SMP && CONFIG_X86_64 */
95
96/*
97 * Allocate cpu_pda pointer table and array via alloc_bootmem.
98 */
99static void __init setup_cpu_pda_map(void)
100{
101 char *pda;
102 struct x8664_pda **new_cpu_pda;
103 unsigned long size;
104 int cpu;
105
106 size = roundup(sizeof(struct x8664_pda), cache_line_size());
107
108 /* allocate cpu_pda array and pointer table */
109 {
110 unsigned long tsize = nr_cpu_ids * sizeof(void *);
111 unsigned long asize = size * (nr_cpu_ids - 1);
112
113 tsize = roundup(tsize, cache_line_size());
114 new_cpu_pda = alloc_bootmem(tsize + asize);
115 pda = (char *)new_cpu_pda + tsize;
116 }
117
118 /* initialize pointer table to static pda's */
119 for_each_possible_cpu(cpu) {
120 if (cpu == 0) {
121 /* leave boot cpu pda in place */
122 new_cpu_pda[0] = cpu_pda(0);
123 continue;
124 }
125 new_cpu_pda[cpu] = (struct x8664_pda *)pda;
126 new_cpu_pda[cpu]->in_bootmem = 1;
127 pda += size;
128 }
129
130 /* point to new pointer table */
131 _cpu_pda = new_cpu_pda;
132}
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133
134#endif /* CONFIG_SMP && CONFIG_X86_64 */
135
136#ifdef CONFIG_X86_64
137
138/* correctly size the local cpu masks */
139static void setup_cpu_local_masks(void)
140{
141 alloc_bootmem_cpumask_var(&cpu_initialized_mask);
142 alloc_bootmem_cpumask_var(&cpu_callin_mask);
143 alloc_bootmem_cpumask_var(&cpu_callout_mask);
144 alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask);
145}
146
147#else /* CONFIG_X86_32 */
148
149static inline void setup_cpu_local_masks(void)
150{
151}
152
153#endif /* CONFIG_X86_32 */
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154
155/*
156 * Great future plan:
157 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
158 * Always point %gs to its beginning
159 */
160void __init setup_per_cpu_areas(void)
161{
d6c88a50 162 ssize_t size, old_size;
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163 char *ptr;
164 int cpu;
1f8ff037 165 unsigned long align = 1;
4fe29a85 166
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167 /* Setup cpu_pda map */
168 setup_cpu_pda_map();
169
4fe29a85 170 /* Copy section for each CPU (we discard the original) */
1f3fcd4b 171 old_size = PERCPU_ENOUGH_ROOM;
1f8ff037 172 align = max_t(unsigned long, PAGE_SIZE, align);
d6c88a50 173 size = roundup(old_size, align);
a1681965 174
ab14398a 175 pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
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176 NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
177
ab14398a 178 pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size);
b447a468 179
3461b0af 180 for_each_possible_cpu(cpu) {
4fe29a85 181#ifndef CONFIG_NEED_MULTIPLE_NODES
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182 ptr = __alloc_bootmem(size, align,
183 __pa(MAX_DMA_ADDRESS));
4fe29a85 184#else
3461b0af 185 int node = early_cpu_to_node(cpu);
b447a468 186 if (!node_online(node) || !NODE_DATA(node)) {
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187 ptr = __alloc_bootmem(size, align,
188 __pa(MAX_DMA_ADDRESS));
ab14398a 189 pr_info("cpu %d has no node %d or node-local memory\n",
3461b0af 190 cpu, node);
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191 pr_debug("per cpu data for cpu%d at %016lx\n",
192 cpu, __pa(ptr));
193 } else {
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194 ptr = __alloc_bootmem_node(NODE_DATA(node), size, align,
195 __pa(MAX_DMA_ADDRESS));
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196 pr_debug("per cpu data for cpu%d on node%d at %016lx\n",
197 cpu, node, __pa(ptr));
a677f58a 198 }
4fe29a85 199#endif
3461b0af 200 per_cpu_offset(cpu) = ptr - __per_cpu_start;
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201 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
202 }
203
b447a468 204 /* Setup percpu data maps */
4fe29a85 205 setup_per_cpu_maps();
9f0e8d04 206
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207 /* Setup node to cpumask map */
208 setup_node_to_cpumask_map();
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209
210 /* Setup cpu initialized, callin, callout masks */
211 setup_cpu_local_masks();
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212}
213
214#endif
c45a707d 215
23ca4bba 216#ifdef X86_64_NUMA
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217
218/*
219 * Allocate node_to_cpumask_map based on number of available nodes
220 * Requires node_possible_map to be valid.
221 *
222 * Note: node_to_cpumask() is not valid until after this is done.
223 */
224static void __init setup_node_to_cpumask_map(void)
225{
226 unsigned int node, num = 0;
227 cpumask_t *map;
228
229 /* setup nr_node_ids if not done yet */
230 if (nr_node_ids == MAX_NUMNODES) {
231 for_each_node_mask(node, node_possible_map)
232 num = node;
233 nr_node_ids = num + 1;
234 }
235
236 /* allocate the map */
237 map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
238
55410791 239 pr_debug("Node to cpumask map at %p for %d nodes\n",
cfc1b9a6 240 map, nr_node_ids);
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241
242 /* node_to_cpumask() will now work */
243 node_to_cpumask_map = map;
244}
245
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246void __cpuinit numa_set_node(int cpu, int node)
247{
248 int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
249
3461b0af 250 if (cpu_pda(cpu) && node != NUMA_NO_NODE)
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251 cpu_pda(cpu)->nodenumber = node;
252
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253 if (cpu_to_node_map)
254 cpu_to_node_map[cpu] = node;
255
256 else if (per_cpu_offset(cpu))
257 per_cpu(x86_cpu_to_node_map, cpu) = node;
258
259 else
cfc1b9a6 260 pr_debug("Setting node for non-present cpu %d\n", cpu);
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261}
262
263void __cpuinit numa_clear_node(int cpu)
264{
265 numa_set_node(cpu, NUMA_NO_NODE);
266}
267
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268#ifndef CONFIG_DEBUG_PER_CPU_MAPS
269
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270void __cpuinit numa_add_cpu(int cpu)
271{
272 cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
273}
274
275void __cpuinit numa_remove_cpu(int cpu)
276{
277 cpu_clear(cpu, node_to_cpumask_map[cpu_to_node(cpu)]);
278}
23ca4bba 279
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280#else /* CONFIG_DEBUG_PER_CPU_MAPS */
281
282/*
283 * --------- debug versions of the numa functions ---------
284 */
285static void __cpuinit numa_set_cpumask(int cpu, int enable)
286{
287 int node = cpu_to_node(cpu);
288 cpumask_t *mask;
289 char buf[64];
290
291 if (node_to_cpumask_map == NULL) {
292 printk(KERN_ERR "node_to_cpumask_map NULL\n");
293 dump_stack();
294 return;
295 }
296
297 mask = &node_to_cpumask_map[node];
298 if (enable)
299 cpu_set(cpu, *mask);
300 else
301 cpu_clear(cpu, *mask);
302
29c0177e 303 cpulist_scnprintf(buf, sizeof(buf), mask);
9f248bde 304 printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
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305 enable ? "numa_add_cpu" : "numa_remove_cpu", cpu, node, buf);
306}
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307
308void __cpuinit numa_add_cpu(int cpu)
309{
310 numa_set_cpumask(cpu, 1);
311}
312
313void __cpuinit numa_remove_cpu(int cpu)
314{
315 numa_set_cpumask(cpu, 0);
316}
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317
318int cpu_to_node(int cpu)
319{
320 if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
321 printk(KERN_WARNING
322 "cpu_to_node(%d): usage too early!\n", cpu);
323 dump_stack();
324 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
325 }
326 return per_cpu(x86_cpu_to_node_map, cpu);
327}
328EXPORT_SYMBOL(cpu_to_node);
329
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330/*
331 * Same function as cpu_to_node() but used if called before the
332 * per_cpu areas are setup.
333 */
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334int early_cpu_to_node(int cpu)
335{
336 if (early_per_cpu_ptr(x86_cpu_to_node_map))
337 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
338
339 if (!per_cpu_offset(cpu)) {
340 printk(KERN_WARNING
341 "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
9f248bde 342 dump_stack();
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MT
343 return NUMA_NO_NODE;
344 }
345 return per_cpu(x86_cpu_to_node_map, cpu);
346}
9f248bde 347
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348
349/* empty cpumask */
350static const cpumask_t cpu_mask_none;
351
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352/*
353 * Returns a pointer to the bitmask of CPUs on Node 'node'.
354 */
393d68fb 355const cpumask_t *cpumask_of_node(int node)
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MT
356{
357 if (node_to_cpumask_map == NULL) {
358 printk(KERN_WARNING
393d68fb 359 "cpumask_of_node(%d): no node_to_cpumask_map!\n",
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MT
360 node);
361 dump_stack();
11369f35 362 return (const cpumask_t *)&cpu_online_map;
9f248bde 363 }
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MT
364 if (node >= nr_node_ids) {
365 printk(KERN_WARNING
393d68fb 366 "cpumask_of_node(%d): node > nr_node_ids(%d)\n",
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MT
367 node, nr_node_ids);
368 dump_stack();
11369f35 369 return &cpu_mask_none;
6a2f47ca 370 }
11369f35 371 return &node_to_cpumask_map[node];
9f248bde 372}
393d68fb 373EXPORT_SYMBOL(cpumask_of_node);
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374
375/*
376 * Returns a bitmask of CPUs on Node 'node'.
6a2f47ca
MT
377 *
378 * Side note: this function creates the returned cpumask on the stack
379 * so with a high NR_CPUS count, excessive stack space is used. The
380 * node_to_cpumask_ptr function should be used whenever possible.
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MT
381 */
382cpumask_t node_to_cpumask(int node)
383{
384 if (node_to_cpumask_map == NULL) {
385 printk(KERN_WARNING
386 "node_to_cpumask(%d): no node_to_cpumask_map!\n", node);
387 dump_stack();
388 return cpu_online_map;
389 }
6a2f47ca
MT
390 if (node >= nr_node_ids) {
391 printk(KERN_WARNING
392 "node_to_cpumask(%d): node > nr_node_ids(%d)\n",
393 node, nr_node_ids);
394 dump_stack();
395 return cpu_mask_none;
396 }
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MT
397 return node_to_cpumask_map[node];
398}
399EXPORT_SYMBOL(node_to_cpumask);
400
401/*
402 * --------- end of debug versions of the numa functions ---------
403 */
404
405#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
406
407#endif /* X86_64_NUMA */
1ecd2765 408
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