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;
83 #ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
84 cpumask_t *cpumask_of_cpu_map __read_mostly;
85 EXPORT_SYMBOL(cpumask_of_cpu_map);
87 /* requires nr_cpu_ids to be initialized */
88 static void __init setup_cpumask_of_cpu(void)
92 /* alloc_bootmem zeroes memory */
93 cpumask_of_cpu_map = alloc_bootmem_low(sizeof(cpumask_t) * nr_cpu_ids);
94 for (i = 0; i < nr_cpu_ids; i++)
95 cpu_set(i, cpumask_of_cpu_map[i]);
98 static inline void setup_cpumask_of_cpu(void) { }
103 * Great future not-so-futuristic plan: make i386 and x86_64 do it
106 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
107 EXPORT_SYMBOL(__per_cpu_offset);
108 static inline void setup_cpu_pda_map(void) { }
110 #elif !defined(CONFIG_SMP)
111 static inline void setup_cpu_pda_map(void) { }
113 #else /* CONFIG_SMP && CONFIG_X86_64 */
116 * Allocate cpu_pda pointer table and array via alloc_bootmem.
118 static void __init setup_cpu_pda_map(void)
121 struct x8664_pda **new_cpu_pda;
125 size = roundup(sizeof(struct x8664_pda), cache_line_size());
127 /* allocate cpu_pda array and pointer table */
129 unsigned long tsize = nr_cpu_ids * sizeof(void *);
130 unsigned long asize = size * (nr_cpu_ids - 1);
132 tsize = roundup(tsize, cache_line_size());
133 new_cpu_pda = alloc_bootmem(tsize + asize);
134 pda = (char *)new_cpu_pda + tsize;
137 /* initialize pointer table to static pda's */
138 for_each_possible_cpu(cpu) {
140 /* leave boot cpu pda in place */
141 new_cpu_pda[0] = cpu_pda(0);
144 new_cpu_pda[cpu] = (struct x8664_pda *)pda;
145 new_cpu_pda[cpu]->in_bootmem = 1;
149 /* point to new pointer table */
150 _cpu_pda = new_cpu_pda;
156 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
157 * Always point %gs to its beginning
159 void __init setup_per_cpu_areas(void)
161 ssize_t size = PERCPU_ENOUGH_ROOM;
165 /* Setup cpu_pda map */
168 /* Copy section for each CPU (we discard the original) */
169 size = PERCPU_ENOUGH_ROOM;
170 printk(KERN_INFO "PERCPU: Allocating %zd bytes of per cpu data\n",
173 for_each_possible_cpu(cpu) {
174 #ifndef CONFIG_NEED_MULTIPLE_NODES
175 ptr = alloc_bootmem_pages(size);
177 int node = early_cpu_to_node(cpu);
178 if (!node_online(node) || !NODE_DATA(node)) {
179 ptr = alloc_bootmem_pages(size);
181 "cpu %d has no node %d or node-local memory\n",
185 ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
187 per_cpu_offset(cpu) = ptr - __per_cpu_start;
188 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
192 printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d, nr_node_ids %d\n",
193 NR_CPUS, nr_cpu_ids, nr_node_ids);
195 /* Setup percpu data maps */
196 setup_per_cpu_maps();
198 /* Setup node to cpumask map */
199 setup_node_to_cpumask_map();
201 /* Setup cpumask_of_cpu map */
202 setup_cpumask_of_cpu();
210 * Allocate node_to_cpumask_map based on number of available nodes
211 * Requires node_possible_map to be valid.
213 * Note: node_to_cpumask() is not valid until after this is done.
215 static void __init setup_node_to_cpumask_map(void)
217 unsigned int node, num = 0;
220 /* setup nr_node_ids if not done yet */
221 if (nr_node_ids == MAX_NUMNODES) {
222 for_each_node_mask(node, node_possible_map)
224 nr_node_ids = num + 1;
227 /* allocate the map */
228 map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
230 pr_debug(KERN_DEBUG "Node to cpumask map at %p for %d nodes\n",
233 /* node_to_cpumask() will now work */
234 node_to_cpumask_map = map;
237 void __cpuinit numa_set_node(int cpu, int node)
239 int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
241 if (cpu_pda(cpu) && node != NUMA_NO_NODE)
242 cpu_pda(cpu)->nodenumber = node;
245 cpu_to_node_map[cpu] = node;
247 else if (per_cpu_offset(cpu))
248 per_cpu(x86_cpu_to_node_map, cpu) = node;
251 pr_debug("Setting node for non-present cpu %d\n", cpu);
254 void __cpuinit numa_clear_node(int cpu)
256 numa_set_node(cpu, NUMA_NO_NODE);
259 #ifndef CONFIG_DEBUG_PER_CPU_MAPS
261 void __cpuinit numa_add_cpu(int cpu)
263 cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
266 void __cpuinit numa_remove_cpu(int cpu)
268 cpu_clear(cpu, node_to_cpumask_map[cpu_to_node(cpu)]);
271 #else /* CONFIG_DEBUG_PER_CPU_MAPS */
274 * --------- debug versions of the numa functions ---------
276 static void __cpuinit numa_set_cpumask(int cpu, int enable)
278 int node = cpu_to_node(cpu);
282 if (node_to_cpumask_map == NULL) {
283 printk(KERN_ERR "node_to_cpumask_map NULL\n");
288 mask = &node_to_cpumask_map[node];
292 cpu_clear(cpu, *mask);
294 cpulist_scnprintf(buf, sizeof(buf), *mask);
295 printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
296 enable? "numa_add_cpu":"numa_remove_cpu", cpu, node, buf);
299 void __cpuinit numa_add_cpu(int cpu)
301 numa_set_cpumask(cpu, 1);
304 void __cpuinit numa_remove_cpu(int cpu)
306 numa_set_cpumask(cpu, 0);
309 int cpu_to_node(int cpu)
311 if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
313 "cpu_to_node(%d): usage too early!\n", cpu);
315 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
317 return per_cpu(x86_cpu_to_node_map, cpu);
319 EXPORT_SYMBOL(cpu_to_node);
322 * Same function as cpu_to_node() but used if called before the
323 * per_cpu areas are setup.
325 int early_cpu_to_node(int cpu)
327 if (early_per_cpu_ptr(x86_cpu_to_node_map))
328 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
330 if (!per_cpu_offset(cpu)) {
332 "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
336 return per_cpu(x86_cpu_to_node_map, cpu);
341 static const cpumask_t cpu_mask_none;
344 * Returns a pointer to the bitmask of CPUs on Node 'node'.
346 const cpumask_t *_node_to_cpumask_ptr(int node)
348 if (node_to_cpumask_map == NULL) {
350 "_node_to_cpumask_ptr(%d): no node_to_cpumask_map!\n",
353 return (const cpumask_t *)&cpu_online_map;
355 if (node >= nr_node_ids) {
357 "_node_to_cpumask_ptr(%d): node > nr_node_ids(%d)\n",
360 return &cpu_mask_none;
362 return &node_to_cpumask_map[node];
364 EXPORT_SYMBOL(_node_to_cpumask_ptr);
367 * Returns a bitmask of CPUs on Node 'node'.
369 * Side note: this function creates the returned cpumask on the stack
370 * so with a high NR_CPUS count, excessive stack space is used. The
371 * node_to_cpumask_ptr function should be used whenever possible.
373 cpumask_t node_to_cpumask(int node)
375 if (node_to_cpumask_map == NULL) {
377 "node_to_cpumask(%d): no node_to_cpumask_map!\n", node);
379 return cpu_online_map;
381 if (node >= nr_node_ids) {
383 "node_to_cpumask(%d): node > nr_node_ids(%d)\n",
386 return cpu_mask_none;
388 return node_to_cpumask_map[node];
390 EXPORT_SYMBOL(node_to_cpumask);
393 * --------- end of debug versions of the numa functions ---------
396 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
398 #endif /* X86_64_NUMA */