Commit | Line | Data |
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4fe29a85 GOC |
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> |
8a87dd9a JSR |
8 | #include <linux/smp.h> |
9 | #include <linux/topology.h> | |
4fe29a85 GOC |
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> |
1a51e3a0 | 16 | #include <asm/proto.h> |
06879033 | 17 | #include <asm/cpumask.h> |
34019be1 | 18 | #include <asm/cpu.h> |
76eb4131 | 19 | |
c90aa894 MT |
20 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS |
21 | # define DBG(x...) printk(KERN_DEBUG x) | |
22 | #else | |
23 | # define DBG(x...) | |
24 | #endif | |
25 | ||
ea927906 BG |
26 | DEFINE_PER_CPU(int, cpu_number); |
27 | EXPORT_PER_CPU_SYMBOL(cpu_number); | |
ea927906 | 28 | |
1688401a BG |
29 | #ifdef CONFIG_X86_64 |
30 | #define BOOT_PERCPU_OFFSET ((unsigned long)__per_cpu_load) | |
31 | #else | |
32 | #define BOOT_PERCPU_OFFSET 0 | |
33 | #endif | |
34 | ||
35 | DEFINE_PER_CPU(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET; | |
36 | EXPORT_PER_CPU_SYMBOL(this_cpu_off); | |
37 | ||
9939ddaf | 38 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = { |
34019be1 | 39 | [0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET, |
9939ddaf | 40 | }; |
9939ddaf | 41 | EXPORT_SYMBOL(__per_cpu_offset); |
4fe29a85 | 42 | |
b2d2f431 BG |
43 | static inline void setup_percpu_segment(int cpu) |
44 | { | |
45 | #ifdef CONFIG_X86_32 | |
46 | struct desc_struct gdt; | |
47 | ||
48 | pack_descriptor(&gdt, per_cpu_offset(cpu), 0xFFFFF, | |
49 | 0x2 | DESCTYPE_S, 0x8); | |
50 | gdt.s = 1; | |
51 | write_gdt_entry(get_cpu_gdt_table(cpu), | |
52 | GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S); | |
53 | #endif | |
54 | } | |
55 | ||
4fe29a85 GOC |
56 | /* |
57 | * Great future plan: | |
58 | * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data. | |
59 | * Always point %gs to its beginning | |
60 | */ | |
61 | void __init setup_per_cpu_areas(void) | |
62 | { | |
74631a24 | 63 | ssize_t size; |
3461b0af MT |
64 | char *ptr; |
65 | int cpu; | |
4fe29a85 | 66 | |
4fe29a85 | 67 | /* Copy section for each CPU (we discard the original) */ |
74631a24 | 68 | size = roundup(PERCPU_ENOUGH_ROOM, PAGE_SIZE); |
a1681965 | 69 | |
ab14398a | 70 | pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n", |
a1681965 MT |
71 | NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids); |
72 | ||
ab14398a | 73 | pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size); |
b447a468 | 74 | |
3461b0af | 75 | for_each_possible_cpu(cpu) { |
4fe29a85 | 76 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
74631a24 | 77 | ptr = alloc_bootmem_pages(size); |
4fe29a85 | 78 | #else |
3461b0af | 79 | int node = early_cpu_to_node(cpu); |
b447a468 | 80 | if (!node_online(node) || !NODE_DATA(node)) { |
74631a24 | 81 | ptr = alloc_bootmem_pages(size); |
ab14398a | 82 | pr_info("cpu %d has no node %d or node-local memory\n", |
3461b0af | 83 | cpu, node); |
ab14398a CG |
84 | pr_debug("per cpu data for cpu%d at %016lx\n", |
85 | cpu, __pa(ptr)); | |
86 | } else { | |
74631a24 | 87 | ptr = alloc_bootmem_pages_node(NODE_DATA(node), size); |
ab14398a CG |
88 | pr_debug("per cpu data for cpu%d on node%d at %016lx\n", |
89 | cpu, node, __pa(ptr)); | |
a677f58a | 90 | } |
4fe29a85 | 91 | #endif |
1a51e3a0 | 92 | |
3e5d8f97 | 93 | memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start); |
9939ddaf | 94 | per_cpu_offset(cpu) = ptr - __per_cpu_start; |
26f80bd6 | 95 | per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu); |
ea927906 | 96 | per_cpu(cpu_number, cpu) = cpu; |
b2d2f431 | 97 | setup_percpu_segment(cpu); |
0d77e7f0 | 98 | /* |
cf3997f5 TH |
99 | * Copy data used in early init routines from the |
100 | * initial arrays to the per cpu data areas. These | |
101 | * arrays then become expendable and the *_early_ptr's | |
102 | * are zeroed indicating that the static arrays are | |
103 | * gone. | |
0d77e7f0 | 104 | */ |
ec70de8b | 105 | #ifdef CONFIG_X86_LOCAL_APIC |
0d77e7f0 | 106 | per_cpu(x86_cpu_to_apicid, cpu) = |
cf3997f5 | 107 | early_per_cpu_map(x86_cpu_to_apicid, cpu); |
0d77e7f0 | 108 | per_cpu(x86_bios_cpu_apicid, cpu) = |
cf3997f5 | 109 | early_per_cpu_map(x86_bios_cpu_apicid, cpu); |
ec70de8b | 110 | #endif |
1a51e3a0 | 111 | #ifdef CONFIG_X86_64 |
26f80bd6 | 112 | per_cpu(irq_stack_ptr, cpu) = |
cf3997f5 TH |
113 | per_cpu(irq_stack_union.irq_stack, cpu) + |
114 | IRQ_STACK_SIZE - 64; | |
6470aff6 BG |
115 | #ifdef CONFIG_NUMA |
116 | per_cpu(x86_cpu_to_node_map, cpu) = | |
cf3997f5 | 117 | early_per_cpu_map(x86_cpu_to_node_map, cpu); |
2697fbd5 | 118 | #endif |
6470aff6 | 119 | #endif |
1a51e3a0 | 120 | /* |
34019be1 | 121 | * Up to this point, the boot CPU has been using .data.init |
2697fbd5 | 122 | * area. Reload any changed state for the boot CPU. |
1a51e3a0 | 123 | */ |
34019be1 | 124 | if (cpu == boot_cpu_id) |
552be871 | 125 | switch_to_new_gdt(cpu); |
c90aa894 MT |
126 | |
127 | DBG("PERCPU: cpu %4d %p\n", cpu, ptr); | |
4fe29a85 GOC |
128 | } |
129 | ||
0d77e7f0 | 130 | /* indicate the early static arrays will soon be gone */ |
22f25138 | 131 | #ifdef CONFIG_X86_LOCAL_APIC |
0d77e7f0 BG |
132 | early_per_cpu_ptr(x86_cpu_to_apicid) = NULL; |
133 | early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL; | |
22f25138 | 134 | #endif |
6470aff6 | 135 | #if defined(CONFIG_X86_64) && defined(CONFIG_NUMA) |
0d77e7f0 BG |
136 | early_per_cpu_ptr(x86_cpu_to_node_map) = NULL; |
137 | #endif | |
9f0e8d04 | 138 | |
9f248bde MT |
139 | /* Setup node to cpumask map */ |
140 | setup_node_to_cpumask_map(); | |
c2d1cec1 MT |
141 | |
142 | /* Setup cpu initialized, callin, callout masks */ | |
143 | setup_cpu_local_masks(); | |
4fe29a85 | 144 | } |