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>
6 #include <linux/kexec.h>
7 #include <linux/crash_dump.h>
9 #include <asm/percpu.h>
10 #include <asm/sections.h>
11 #include <asm/processor.h>
12 #include <asm/setup.h>
13 #include <asm/topology.h>
14 #include <asm/mpspec.h>
15 #include <asm/apicdef.h>
16 #include <asm/highmem.h>
18 #ifdef CONFIG_X86_LOCAL_APIC
19 unsigned int num_processors;
20 unsigned disabled_cpus __cpuinitdata;
21 /* Processor that is doing the boot up */
22 unsigned int boot_cpu_physical_apicid = -1U;
23 unsigned int max_physical_apicid;
24 EXPORT_SYMBOL(boot_cpu_physical_apicid);
26 /* Bitmask of physically existing CPUs */
27 physid_mask_t phys_cpu_present_map;
30 /* map cpu index to physical APIC ID */
31 DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID);
32 DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID);
33 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
34 EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
36 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
39 /* map cpu index to node index */
40 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
41 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
43 /* which logical CPUs are on which nodes */
44 cpumask_t *node_to_cpumask_map;
45 EXPORT_SYMBOL(node_to_cpumask_map);
47 /* setup node_to_cpumask_map */
48 static void __init setup_node_to_cpumask_map(void);
51 static inline void setup_node_to_cpumask_map(void) { }
54 #if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
56 * Copy data used in early init routines from the initial arrays to the
57 * per cpu data areas. These arrays then become expendable and the
58 * *_early_ptr's are zeroed indicating that the static arrays are gone.
60 static void __init setup_per_cpu_maps(void)
64 for_each_possible_cpu(cpu) {
65 per_cpu(x86_cpu_to_apicid, cpu) =
66 early_per_cpu_map(x86_cpu_to_apicid, cpu);
67 per_cpu(x86_bios_cpu_apicid, cpu) =
68 early_per_cpu_map(x86_bios_cpu_apicid, cpu);
70 per_cpu(x86_cpu_to_node_map, cpu) =
71 early_per_cpu_map(x86_cpu_to_node_map, cpu);
75 /* indicate the early static arrays will soon be gone */
76 early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
77 early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
79 early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
85 * Great future not-so-futuristic plan: make i386 and x86_64 do it
88 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
89 EXPORT_SYMBOL(__per_cpu_offset);
90 static inline void setup_cpu_pda_map(void) { }
92 #elif !defined(CONFIG_SMP)
93 static inline void setup_cpu_pda_map(void) { }
95 #else /* CONFIG_SMP && CONFIG_X86_64 */
98 * Allocate cpu_pda pointer table and array via alloc_bootmem.
100 static void __init setup_cpu_pda_map(void)
103 struct x8664_pda **new_cpu_pda;
107 size = roundup(sizeof(struct x8664_pda), cache_line_size());
109 /* allocate cpu_pda array and pointer table */
111 unsigned long tsize = nr_cpu_ids * sizeof(void *);
112 unsigned long asize = size * (nr_cpu_ids - 1);
114 tsize = roundup(tsize, cache_line_size());
115 new_cpu_pda = alloc_bootmem(tsize + asize);
116 pda = (char *)new_cpu_pda + tsize;
119 /* initialize pointer table to static pda's */
120 for_each_possible_cpu(cpu) {
122 /* leave boot cpu pda in place */
123 new_cpu_pda[0] = cpu_pda(0);
126 new_cpu_pda[cpu] = (struct x8664_pda *)pda;
127 new_cpu_pda[cpu]->in_bootmem = 1;
131 /* point to new pointer table */
132 _cpu_pda = new_cpu_pda;
138 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
139 * Always point %gs to its beginning
141 void __init setup_per_cpu_areas(void)
143 ssize_t size = PERCPU_ENOUGH_ROOM;
147 /* Setup cpu_pda map */
150 /* Copy section for each CPU (we discard the original) */
151 size = PERCPU_ENOUGH_ROOM;
152 printk(KERN_INFO "PERCPU: Allocating %zd bytes of per cpu data\n",
155 for_each_possible_cpu(cpu) {
156 #ifndef CONFIG_NEED_MULTIPLE_NODES
157 ptr = alloc_bootmem_pages(size);
159 int node = early_cpu_to_node(cpu);
160 if (!node_online(node) || !NODE_DATA(node)) {
161 ptr = alloc_bootmem_pages(size);
163 "cpu %d has no node %d or node-local memory\n",
167 ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
169 per_cpu_offset(cpu) = ptr - __per_cpu_start;
170 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
174 printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d, nr_node_ids %d\n",
175 NR_CPUS, nr_cpu_ids, nr_node_ids);
177 /* Setup percpu data maps */
178 setup_per_cpu_maps();
180 /* Setup node to cpumask map */
181 setup_node_to_cpumask_map();
189 * Allocate node_to_cpumask_map based on number of available nodes
190 * Requires node_possible_map to be valid.
192 * Note: node_to_cpumask() is not valid until after this is done.
194 static void __init setup_node_to_cpumask_map(void)
196 unsigned int node, num = 0;
199 /* setup nr_node_ids if not done yet */
200 if (nr_node_ids == MAX_NUMNODES) {
201 for_each_node_mask(node, node_possible_map)
203 nr_node_ids = num + 1;
206 /* allocate the map */
207 map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
209 pr_debug(KERN_DEBUG "Node to cpumask map at %p for %d nodes\n",
212 /* node_to_cpumask() will now work */
213 node_to_cpumask_map = map;
216 void __cpuinit numa_set_node(int cpu, int node)
218 int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
220 if (cpu_pda(cpu) && node != NUMA_NO_NODE)
221 cpu_pda(cpu)->nodenumber = node;
224 cpu_to_node_map[cpu] = node;
226 else if (per_cpu_offset(cpu))
227 per_cpu(x86_cpu_to_node_map, cpu) = node;
230 pr_debug("Setting node for non-present cpu %d\n", cpu);
233 void __cpuinit numa_clear_node(int cpu)
235 numa_set_node(cpu, NUMA_NO_NODE);
238 #ifndef CONFIG_DEBUG_PER_CPU_MAPS
240 void __cpuinit numa_add_cpu(int cpu)
242 cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
245 void __cpuinit numa_remove_cpu(int cpu)
247 cpu_clear(cpu, node_to_cpumask_map[cpu_to_node(cpu)]);
250 #else /* CONFIG_DEBUG_PER_CPU_MAPS */
253 * --------- debug versions of the numa functions ---------
255 static void __cpuinit numa_set_cpumask(int cpu, int enable)
257 int node = cpu_to_node(cpu);
261 if (node_to_cpumask_map == NULL) {
262 printk(KERN_ERR "node_to_cpumask_map NULL\n");
267 mask = &node_to_cpumask_map[node];
271 cpu_clear(cpu, *mask);
273 cpulist_scnprintf(buf, sizeof(buf), *mask);
274 printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
275 enable? "numa_add_cpu":"numa_remove_cpu", cpu, node, buf);
278 void __cpuinit numa_add_cpu(int cpu)
280 numa_set_cpumask(cpu, 1);
283 void __cpuinit numa_remove_cpu(int cpu)
285 numa_set_cpumask(cpu, 0);
288 int cpu_to_node(int cpu)
290 if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
292 "cpu_to_node(%d): usage too early!\n", cpu);
294 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
296 return per_cpu(x86_cpu_to_node_map, cpu);
298 EXPORT_SYMBOL(cpu_to_node);
301 * Same function as cpu_to_node() but used if called before the
302 * per_cpu areas are setup.
304 int early_cpu_to_node(int cpu)
306 if (early_per_cpu_ptr(x86_cpu_to_node_map))
307 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
309 if (!per_cpu_offset(cpu)) {
311 "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
315 return per_cpu(x86_cpu_to_node_map, cpu);
320 static const cpumask_t cpu_mask_none;
323 * Returns a pointer to the bitmask of CPUs on Node 'node'.
325 const cpumask_t *_node_to_cpumask_ptr(int node)
327 if (node_to_cpumask_map == NULL) {
329 "_node_to_cpumask_ptr(%d): no node_to_cpumask_map!\n",
332 return (const cpumask_t *)&cpu_online_map;
334 if (node >= nr_node_ids) {
336 "_node_to_cpumask_ptr(%d): node > nr_node_ids(%d)\n",
339 return &cpu_mask_none;
341 return &node_to_cpumask_map[node];
343 EXPORT_SYMBOL(_node_to_cpumask_ptr);
346 * Returns a bitmask of CPUs on Node 'node'.
348 * Side note: this function creates the returned cpumask on the stack
349 * so with a high NR_CPUS count, excessive stack space is used. The
350 * node_to_cpumask_ptr function should be used whenever possible.
352 cpumask_t node_to_cpumask(int node)
354 if (node_to_cpumask_map == NULL) {
356 "node_to_cpumask(%d): no node_to_cpumask_map!\n", node);
358 return cpu_online_map;
360 if (node >= nr_node_ids) {
362 "node_to_cpumask(%d): node > nr_node_ids(%d)\n",
365 return cpu_mask_none;
367 return node_to_cpumask_map[node];
369 EXPORT_SYMBOL(node_to_cpumask);
372 * --------- end of debug versions of the numa functions ---------
375 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
377 #endif /* X86_64_NUMA */