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 <linux/topology.h>
10 #include <asm/sections.h>
11 #include <asm/processor.h>
12 #include <asm/setup.h>
13 #include <asm/mpspec.h>
14 #include <asm/apicdef.h>
15 #include <asm/highmem.h>
16 #include <asm/cpumask.h>
18 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
19 # define DBG(x...) printk(KERN_DEBUG x)
24 #ifdef CONFIG_X86_LOCAL_APIC
25 unsigned int num_processors;
26 unsigned disabled_cpus __cpuinitdata;
27 /* Processor that is doing the boot up */
28 unsigned int boot_cpu_physical_apicid = -1U;
29 EXPORT_SYMBOL(boot_cpu_physical_apicid);
30 unsigned int max_physical_apicid;
32 /* Bitmask of physically existing CPUs */
33 physid_mask_t phys_cpu_present_map;
37 * Map cpu index to physical APIC ID
39 DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID);
40 DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID);
41 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
42 EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
44 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
45 #define X86_64_NUMA 1 /* (used later) */
48 * Map cpu index to node index
50 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
51 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
54 * Which logical CPUs are on which nodes
56 cpumask_t *node_to_cpumask_map;
57 EXPORT_SYMBOL(node_to_cpumask_map);
60 * Setup node_to_cpumask_map
62 static void __init setup_node_to_cpumask_map(void);
65 static inline void setup_node_to_cpumask_map(void) { }
68 #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
70 * Copy data used in early init routines from the initial arrays to the
71 * per cpu data areas. These arrays then become expendable and the
72 * *_early_ptr's are zeroed indicating that the static arrays are gone.
74 static void __init setup_per_cpu_maps(void)
78 for_each_possible_cpu(cpu) {
79 per_cpu(x86_cpu_to_apicid, cpu) =
80 early_per_cpu_map(x86_cpu_to_apicid, cpu);
81 per_cpu(x86_bios_cpu_apicid, cpu) =
82 early_per_cpu_map(x86_bios_cpu_apicid, cpu);
84 per_cpu(x86_cpu_to_node_map, cpu) =
85 early_per_cpu_map(x86_cpu_to_node_map, cpu);
89 /* indicate the early static arrays will soon be gone */
90 early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
91 early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
93 early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
99 * Great future not-so-futuristic plan: make i386 and x86_64 do it
102 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
103 EXPORT_SYMBOL(__per_cpu_offset);
104 static inline void setup_cpu_pda_map(void) { }
106 #elif !defined(CONFIG_SMP)
107 static inline void setup_cpu_pda_map(void) { }
109 #else /* CONFIG_SMP && CONFIG_X86_64 */
112 * Allocate cpu_pda pointer table and array via alloc_bootmem.
114 static void __init setup_cpu_pda_map(void)
120 size = roundup(sizeof(struct x8664_pda), cache_line_size());
122 /* allocate cpu_pda array and pointer table */
124 unsigned long asize = size * (nr_cpu_ids - 1);
126 pda = alloc_bootmem(asize);
129 /* initialize pointer table to static pda's */
130 for_each_possible_cpu(cpu) {
132 /* leave boot cpu pda in place */
135 cpu_pda(cpu) = (struct x8664_pda *)pda;
136 cpu_pda(cpu)->in_bootmem = 1;
141 #endif /* CONFIG_SMP && CONFIG_X86_64 */
145 /* correctly size the local cpu masks */
146 static void setup_cpu_local_masks(void)
148 alloc_bootmem_cpumask_var(&cpu_initialized_mask);
149 alloc_bootmem_cpumask_var(&cpu_callin_mask);
150 alloc_bootmem_cpumask_var(&cpu_callout_mask);
151 alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask);
154 #else /* CONFIG_X86_32 */
156 static inline void setup_cpu_local_masks(void)
160 #endif /* CONFIG_X86_32 */
164 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
165 * Always point %gs to its beginning
167 void __init setup_per_cpu_areas(void)
169 ssize_t size, old_size;
172 unsigned long align = 1;
174 /* Setup cpu_pda map */
177 /* Copy section for each CPU (we discard the original) */
178 old_size = PERCPU_ENOUGH_ROOM;
179 align = max_t(unsigned long, PAGE_SIZE, align);
180 size = roundup(old_size, align);
182 pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
183 NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
185 pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size);
187 for_each_possible_cpu(cpu) {
188 #ifndef CONFIG_NEED_MULTIPLE_NODES
189 ptr = __alloc_bootmem(size, align,
190 __pa(MAX_DMA_ADDRESS));
192 int node = early_cpu_to_node(cpu);
193 if (!node_online(node) || !NODE_DATA(node)) {
194 ptr = __alloc_bootmem(size, align,
195 __pa(MAX_DMA_ADDRESS));
196 pr_info("cpu %d has no node %d or node-local memory\n",
198 pr_debug("per cpu data for cpu%d at %016lx\n",
201 ptr = __alloc_bootmem_node(NODE_DATA(node), size, align,
202 __pa(MAX_DMA_ADDRESS));
203 pr_debug("per cpu data for cpu%d on node%d at %016lx\n",
204 cpu, node, __pa(ptr));
207 per_cpu_offset(cpu) = ptr - __per_cpu_start;
208 memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start);
210 DBG("PERCPU: cpu %4d %p\n", cpu, ptr);
213 /* Setup percpu data maps */
214 setup_per_cpu_maps();
216 /* Setup node to cpumask map */
217 setup_node_to_cpumask_map();
219 /* Setup cpu initialized, callin, callout masks */
220 setup_cpu_local_masks();
228 * Allocate node_to_cpumask_map based on number of available nodes
229 * Requires node_possible_map to be valid.
231 * Note: node_to_cpumask() is not valid until after this is done.
232 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
234 static void __init setup_node_to_cpumask_map(void)
236 unsigned int node, num = 0;
239 /* setup nr_node_ids if not done yet */
240 if (nr_node_ids == MAX_NUMNODES) {
241 for_each_node_mask(node, node_possible_map)
243 nr_node_ids = num + 1;
246 /* allocate the map */
247 map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
248 DBG("node_to_cpumask_map at %p for %d nodes\n", map, nr_node_ids);
250 pr_debug("Node to cpumask map at %p for %d nodes\n",
253 /* node_to_cpumask() will now work */
254 node_to_cpumask_map = map;
257 void __cpuinit numa_set_node(int cpu, int node)
259 int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
261 /* early setting, no percpu area yet */
262 if (cpu_to_node_map) {
263 cpu_to_node_map[cpu] = node;
267 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
268 if (cpu >= nr_cpu_ids || !per_cpu_offset(cpu)) {
269 printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu);
274 per_cpu(x86_cpu_to_node_map, cpu) = node;
276 if (node != NUMA_NO_NODE)
277 cpu_pda(cpu)->nodenumber = node;
280 void __cpuinit numa_clear_node(int cpu)
282 numa_set_node(cpu, NUMA_NO_NODE);
285 #ifndef CONFIG_DEBUG_PER_CPU_MAPS
287 void __cpuinit numa_add_cpu(int cpu)
289 cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
292 void __cpuinit numa_remove_cpu(int cpu)
294 cpu_clear(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
297 #else /* CONFIG_DEBUG_PER_CPU_MAPS */
300 * --------- debug versions of the numa functions ---------
302 static void __cpuinit numa_set_cpumask(int cpu, int enable)
304 int node = early_cpu_to_node(cpu);
308 if (node_to_cpumask_map == NULL) {
309 printk(KERN_ERR "node_to_cpumask_map NULL\n");
314 mask = &node_to_cpumask_map[node];
318 cpu_clear(cpu, *mask);
320 cpulist_scnprintf(buf, sizeof(buf), mask);
321 printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
322 enable ? "numa_add_cpu" : "numa_remove_cpu", cpu, node, buf);
325 void __cpuinit numa_add_cpu(int cpu)
327 numa_set_cpumask(cpu, 1);
330 void __cpuinit numa_remove_cpu(int cpu)
332 numa_set_cpumask(cpu, 0);
335 int cpu_to_node(int cpu)
337 if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
339 "cpu_to_node(%d): usage too early!\n", cpu);
341 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
343 return per_cpu(x86_cpu_to_node_map, cpu);
345 EXPORT_SYMBOL(cpu_to_node);
348 * Same function as cpu_to_node() but used if called before the
349 * per_cpu areas are setup.
351 int early_cpu_to_node(int cpu)
353 if (early_per_cpu_ptr(x86_cpu_to_node_map))
354 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
356 if (!per_cpu_offset(cpu)) {
358 "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
362 return per_cpu(x86_cpu_to_node_map, cpu);
367 static const cpumask_t cpu_mask_none;
370 * Returns a pointer to the bitmask of CPUs on Node 'node'.
372 const cpumask_t *cpumask_of_node(int node)
374 if (node_to_cpumask_map == NULL) {
376 "cpumask_of_node(%d): no node_to_cpumask_map!\n",
379 return (const cpumask_t *)&cpu_online_map;
381 if (node >= nr_node_ids) {
383 "cpumask_of_node(%d): node > nr_node_ids(%d)\n",
386 return &cpu_mask_none;
388 return &node_to_cpumask_map[node];
390 EXPORT_SYMBOL(cpumask_of_node);
393 * Returns a bitmask of CPUs on Node 'node'.
395 * Side note: this function creates the returned cpumask on the stack
396 * so with a high NR_CPUS count, excessive stack space is used. The
397 * node_to_cpumask_ptr function should be used whenever possible.
399 cpumask_t node_to_cpumask(int node)
401 if (node_to_cpumask_map == NULL) {
403 "node_to_cpumask(%d): no node_to_cpumask_map!\n", node);
405 return cpu_online_map;
407 if (node >= nr_node_ids) {
409 "node_to_cpumask(%d): node > nr_node_ids(%d)\n",
412 return cpu_mask_none;
414 return node_to_cpumask_map[node];
416 EXPORT_SYMBOL(node_to_cpumask);
419 * --------- end of debug versions of the numa functions ---------
422 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
424 #endif /* X86_64_NUMA */