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/proto.h>
17 #include <asm/cpumask.h>
19 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
20 # define DBG(x...) printk(KERN_DEBUG x)
26 * Could be inside CONFIG_HAVE_SETUP_PER_CPU_AREA with other stuff but
27 * voyager wants cpu_number too.
30 DEFINE_PER_CPU(int, cpu_number);
31 EXPORT_PER_CPU_SYMBOL(cpu_number);
34 #ifdef CONFIG_X86_LOCAL_APIC
35 unsigned int num_processors;
36 unsigned disabled_cpus __cpuinitdata;
37 /* Processor that is doing the boot up */
38 unsigned int boot_cpu_physical_apicid = -1U;
39 EXPORT_SYMBOL(boot_cpu_physical_apicid);
40 unsigned int max_physical_apicid;
42 /* Bitmask of physically existing CPUs */
43 physid_mask_t phys_cpu_present_map;
47 * Map cpu index to physical APIC ID
49 DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID);
50 DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID);
51 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
52 EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
54 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
55 #define X86_64_NUMA 1 /* (used later) */
56 DEFINE_PER_CPU(int, node_number) = 0;
57 EXPORT_PER_CPU_SYMBOL(node_number);
60 * Map cpu index to node index
62 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
63 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
66 * Which logical CPUs are on which nodes
68 cpumask_t *node_to_cpumask_map;
69 EXPORT_SYMBOL(node_to_cpumask_map);
72 * Setup node_to_cpumask_map
74 static void __init setup_node_to_cpumask_map(void);
77 static inline void setup_node_to_cpumask_map(void) { }
81 * Define load_pda_offset() and per-cpu __pda for x86_64.
82 * load_pda_offset() is responsible for loading the offset of pda into
85 * On SMP, pda offset also duals as percpu base address and thus it
86 * should be at the start of per-cpu area. To achieve this, it's
87 * preallocated in vmlinux_64.lds.S directly instead of using
91 void __cpuinit load_pda_offset(int cpu)
93 /* Memory clobbers used to order pda/percpu accesses */
95 wrmsrl(MSR_GS_BASE, cpu_pda(cpu));
99 DEFINE_PER_CPU(struct x8664_pda, __pda);
101 EXPORT_PER_CPU_SYMBOL(__pda);
102 #endif /* CONFIG_SMP && CONFIG_X86_64 */
106 /* correctly size the local cpu masks */
107 static void setup_cpu_local_masks(void)
109 alloc_bootmem_cpumask_var(&cpu_initialized_mask);
110 alloc_bootmem_cpumask_var(&cpu_callin_mask);
111 alloc_bootmem_cpumask_var(&cpu_callout_mask);
112 alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask);
115 #else /* CONFIG_X86_32 */
117 static inline void setup_cpu_local_masks(void)
121 #endif /* CONFIG_X86_32 */
123 #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
125 * Copy data used in early init routines from the initial arrays to the
126 * per cpu data areas. These arrays then become expendable and the
127 * *_early_ptr's are zeroed indicating that the static arrays are gone.
129 static void __init setup_per_cpu_maps(void)
133 for_each_possible_cpu(cpu) {
134 per_cpu(x86_cpu_to_apicid, cpu) =
135 early_per_cpu_map(x86_cpu_to_apicid, cpu);
136 per_cpu(x86_bios_cpu_apicid, cpu) =
137 early_per_cpu_map(x86_bios_cpu_apicid, cpu);
139 per_cpu(x86_cpu_to_node_map, cpu) =
140 early_per_cpu_map(x86_cpu_to_node_map, cpu);
144 /* indicate the early static arrays will soon be gone */
145 early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
146 early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
148 early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
153 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = {
154 [0] = (unsigned long)__per_cpu_load,
157 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
159 EXPORT_SYMBOL(__per_cpu_offset);
163 * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
164 * Always point %gs to its beginning
166 void __init setup_per_cpu_areas(void)
168 ssize_t size, old_size;
171 unsigned long align = 1;
173 /* Copy section for each CPU (we discard the original) */
174 old_size = PERCPU_ENOUGH_ROOM;
175 align = max_t(unsigned long, PAGE_SIZE, align);
176 size = roundup(old_size, align);
178 pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
179 NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
181 pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size);
183 for_each_possible_cpu(cpu) {
184 #ifndef CONFIG_NEED_MULTIPLE_NODES
185 ptr = __alloc_bootmem(size, align,
186 __pa(MAX_DMA_ADDRESS));
188 int node = early_cpu_to_node(cpu);
189 if (!node_online(node) || !NODE_DATA(node)) {
190 ptr = __alloc_bootmem(size, align,
191 __pa(MAX_DMA_ADDRESS));
192 pr_info("cpu %d has no node %d or node-local memory\n",
194 pr_debug("per cpu data for cpu%d at %016lx\n",
197 ptr = __alloc_bootmem_node(NODE_DATA(node), size, align,
198 __pa(MAX_DMA_ADDRESS));
199 pr_debug("per cpu data for cpu%d on node%d at %016lx\n",
200 cpu, node, __pa(ptr));
204 memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start);
205 per_cpu_offset(cpu) = ptr - __per_cpu_start;
206 per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
207 per_cpu(cpu_number, cpu) = cpu;
209 per_cpu(irq_stack_ptr, cpu) =
210 (char *)per_cpu(irq_stack, cpu) + IRQ_STACK_SIZE - 64;
212 * CPU0 modified pda in the init data area, reload pda
213 * offset for CPU0 and clear the area for others.
218 memset(cpu_pda(cpu), 0, sizeof(*cpu_pda(cpu)));
221 DBG("PERCPU: cpu %4d %p\n", cpu, ptr);
224 /* Setup percpu data maps */
225 setup_per_cpu_maps();
227 /* Setup node to cpumask map */
228 setup_node_to_cpumask_map();
230 /* Setup cpu initialized, callin, callout masks */
231 setup_cpu_local_masks();
239 * Allocate node_to_cpumask_map based on number of available nodes
240 * Requires node_possible_map to be valid.
242 * Note: node_to_cpumask() is not valid until after this is done.
243 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.)
245 static void __init setup_node_to_cpumask_map(void)
247 unsigned int node, num = 0;
250 /* setup nr_node_ids if not done yet */
251 if (nr_node_ids == MAX_NUMNODES) {
252 for_each_node_mask(node, node_possible_map)
254 nr_node_ids = num + 1;
257 /* allocate the map */
258 map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
259 DBG("node_to_cpumask_map at %p for %d nodes\n", map, nr_node_ids);
261 pr_debug("Node to cpumask map at %p for %d nodes\n",
264 /* node_to_cpumask() will now work */
265 node_to_cpumask_map = map;
268 void __cpuinit numa_set_node(int cpu, int node)
270 int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
272 /* early setting, no percpu area yet */
273 if (cpu_to_node_map) {
274 cpu_to_node_map[cpu] = node;
278 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
279 if (cpu >= nr_cpu_ids || !per_cpu_offset(cpu)) {
280 printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu);
285 per_cpu(x86_cpu_to_node_map, cpu) = node;
287 if (node != NUMA_NO_NODE)
288 per_cpu(node_number, cpu) = node;
291 void __cpuinit numa_clear_node(int cpu)
293 numa_set_node(cpu, NUMA_NO_NODE);
296 #ifndef CONFIG_DEBUG_PER_CPU_MAPS
298 void __cpuinit numa_add_cpu(int cpu)
300 cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
303 void __cpuinit numa_remove_cpu(int cpu)
305 cpu_clear(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
308 #else /* CONFIG_DEBUG_PER_CPU_MAPS */
311 * --------- debug versions of the numa functions ---------
313 static void __cpuinit numa_set_cpumask(int cpu, int enable)
315 int node = early_cpu_to_node(cpu);
319 if (node_to_cpumask_map == NULL) {
320 printk(KERN_ERR "node_to_cpumask_map NULL\n");
325 mask = &node_to_cpumask_map[node];
329 cpu_clear(cpu, *mask);
331 cpulist_scnprintf(buf, sizeof(buf), mask);
332 printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
333 enable ? "numa_add_cpu" : "numa_remove_cpu", cpu, node, buf);
336 void __cpuinit numa_add_cpu(int cpu)
338 numa_set_cpumask(cpu, 1);
341 void __cpuinit numa_remove_cpu(int cpu)
343 numa_set_cpumask(cpu, 0);
346 int cpu_to_node(int cpu)
348 if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
350 "cpu_to_node(%d): usage too early!\n", cpu);
352 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
354 return per_cpu(x86_cpu_to_node_map, cpu);
356 EXPORT_SYMBOL(cpu_to_node);
359 * Same function as cpu_to_node() but used if called before the
360 * per_cpu areas are setup.
362 int early_cpu_to_node(int cpu)
364 if (early_per_cpu_ptr(x86_cpu_to_node_map))
365 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
367 if (!per_cpu_offset(cpu)) {
369 "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
373 return per_cpu(x86_cpu_to_node_map, cpu);
378 static const cpumask_t cpu_mask_none;
381 * Returns a pointer to the bitmask of CPUs on Node 'node'.
383 const cpumask_t *cpumask_of_node(int node)
385 if (node_to_cpumask_map == NULL) {
387 "cpumask_of_node(%d): no node_to_cpumask_map!\n",
390 return (const cpumask_t *)&cpu_online_map;
392 if (node >= nr_node_ids) {
394 "cpumask_of_node(%d): node > nr_node_ids(%d)\n",
397 return &cpu_mask_none;
399 return &node_to_cpumask_map[node];
401 EXPORT_SYMBOL(cpumask_of_node);
404 * Returns a bitmask of CPUs on Node 'node'.
406 * Side note: this function creates the returned cpumask on the stack
407 * so with a high NR_CPUS count, excessive stack space is used. The
408 * node_to_cpumask_ptr function should be used whenever possible.
410 cpumask_t node_to_cpumask(int node)
412 if (node_to_cpumask_map == NULL) {
414 "node_to_cpumask(%d): no node_to_cpumask_map!\n", node);
416 return cpu_online_map;
418 if (node >= nr_node_ids) {
420 "node_to_cpumask(%d): node > nr_node_ids(%d)\n",
423 return cpu_mask_none;
425 return node_to_cpumask_map[node];
427 EXPORT_SYMBOL(node_to_cpumask);
430 * --------- end of debug versions of the numa functions ---------
433 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
435 #endif /* X86_64_NUMA */