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> |
60a5317f | 19 | #include <asm/stackprotector.h> |
76eb4131 | 20 | |
c90aa894 MT |
21 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS |
22 | # define DBG(x...) printk(KERN_DEBUG x) | |
23 | #else | |
24 | # define DBG(x...) | |
25 | #endif | |
26 | ||
ea927906 BG |
27 | DEFINE_PER_CPU(int, cpu_number); |
28 | EXPORT_PER_CPU_SYMBOL(cpu_number); | |
ea927906 | 29 | |
1688401a BG |
30 | #ifdef CONFIG_X86_64 |
31 | #define BOOT_PERCPU_OFFSET ((unsigned long)__per_cpu_load) | |
32 | #else | |
33 | #define BOOT_PERCPU_OFFSET 0 | |
34 | #endif | |
35 | ||
36 | DEFINE_PER_CPU(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET; | |
37 | EXPORT_PER_CPU_SYMBOL(this_cpu_off); | |
38 | ||
9939ddaf | 39 | unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = { |
34019be1 | 40 | [0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET, |
9939ddaf | 41 | }; |
9939ddaf | 42 | EXPORT_SYMBOL(__per_cpu_offset); |
4fe29a85 | 43 | |
b2d2f431 BG |
44 | static inline void setup_percpu_segment(int cpu) |
45 | { | |
46 | #ifdef CONFIG_X86_32 | |
47 | struct desc_struct gdt; | |
48 | ||
49 | pack_descriptor(&gdt, per_cpu_offset(cpu), 0xFFFFF, | |
50 | 0x2 | DESCTYPE_S, 0x8); | |
51 | gdt.s = 1; | |
52 | write_gdt_entry(get_cpu_gdt_table(cpu), | |
53 | GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S); | |
54 | #endif | |
55 | } | |
56 | ||
4fe29a85 GOC |
57 | /* |
58 | * Great future plan: | |
59 | * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data. | |
60 | * Always point %gs to its beginning | |
61 | */ | |
62 | void __init setup_per_cpu_areas(void) | |
63 | { | |
74631a24 | 64 | ssize_t size; |
3461b0af MT |
65 | char *ptr; |
66 | int cpu; | |
4fe29a85 | 67 | |
4fe29a85 | 68 | /* Copy section for each CPU (we discard the original) */ |
74631a24 | 69 | size = roundup(PERCPU_ENOUGH_ROOM, PAGE_SIZE); |
a1681965 | 70 | |
ab14398a | 71 | pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n", |
a1681965 MT |
72 | NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids); |
73 | ||
ab14398a | 74 | pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size); |
b447a468 | 75 | |
3461b0af | 76 | for_each_possible_cpu(cpu) { |
4fe29a85 | 77 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
74631a24 | 78 | ptr = alloc_bootmem_pages(size); |
4fe29a85 | 79 | #else |
3461b0af | 80 | int node = early_cpu_to_node(cpu); |
b447a468 | 81 | if (!node_online(node) || !NODE_DATA(node)) { |
74631a24 | 82 | ptr = alloc_bootmem_pages(size); |
ab14398a | 83 | pr_info("cpu %d has no node %d or node-local memory\n", |
3461b0af | 84 | cpu, node); |
ab14398a CG |
85 | pr_debug("per cpu data for cpu%d at %016lx\n", |
86 | cpu, __pa(ptr)); | |
87 | } else { | |
74631a24 | 88 | ptr = alloc_bootmem_pages_node(NODE_DATA(node), size); |
ab14398a CG |
89 | pr_debug("per cpu data for cpu%d on node%d at %016lx\n", |
90 | cpu, node, __pa(ptr)); | |
a677f58a | 91 | } |
4fe29a85 | 92 | #endif |
1a51e3a0 | 93 | |
3e5d8f97 | 94 | memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start); |
9939ddaf | 95 | per_cpu_offset(cpu) = ptr - __per_cpu_start; |
26f80bd6 | 96 | per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu); |
ea927906 | 97 | per_cpu(cpu_number, cpu) = cpu; |
b2d2f431 | 98 | setup_percpu_segment(cpu); |
60a5317f | 99 | setup_stack_canary_segment(cpu); |
0d77e7f0 | 100 | /* |
cf3997f5 TH |
101 | * Copy data used in early init routines from the |
102 | * initial arrays to the per cpu data areas. These | |
103 | * arrays then become expendable and the *_early_ptr's | |
104 | * are zeroed indicating that the static arrays are | |
105 | * gone. | |
0d77e7f0 | 106 | */ |
ec70de8b | 107 | #ifdef CONFIG_X86_LOCAL_APIC |
0d77e7f0 | 108 | per_cpu(x86_cpu_to_apicid, cpu) = |
cf3997f5 | 109 | early_per_cpu_map(x86_cpu_to_apicid, cpu); |
0d77e7f0 | 110 | per_cpu(x86_bios_cpu_apicid, cpu) = |
cf3997f5 | 111 | early_per_cpu_map(x86_bios_cpu_apicid, cpu); |
ec70de8b | 112 | #endif |
1a51e3a0 | 113 | #ifdef CONFIG_X86_64 |
26f80bd6 | 114 | per_cpu(irq_stack_ptr, cpu) = |
cf3997f5 TH |
115 | per_cpu(irq_stack_union.irq_stack, cpu) + |
116 | IRQ_STACK_SIZE - 64; | |
6470aff6 BG |
117 | #ifdef CONFIG_NUMA |
118 | per_cpu(x86_cpu_to_node_map, cpu) = | |
cf3997f5 | 119 | early_per_cpu_map(x86_cpu_to_node_map, cpu); |
2697fbd5 | 120 | #endif |
6470aff6 | 121 | #endif |
1a51e3a0 | 122 | /* |
34019be1 | 123 | * Up to this point, the boot CPU has been using .data.init |
2697fbd5 | 124 | * area. Reload any changed state for the boot CPU. |
1a51e3a0 | 125 | */ |
34019be1 | 126 | if (cpu == boot_cpu_id) |
552be871 | 127 | switch_to_new_gdt(cpu); |
c90aa894 MT |
128 | |
129 | DBG("PERCPU: cpu %4d %p\n", cpu, ptr); | |
4fe29a85 GOC |
130 | } |
131 | ||
0d77e7f0 | 132 | /* indicate the early static arrays will soon be gone */ |
22f25138 | 133 | #ifdef CONFIG_X86_LOCAL_APIC |
0d77e7f0 BG |
134 | early_per_cpu_ptr(x86_cpu_to_apicid) = NULL; |
135 | early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL; | |
22f25138 | 136 | #endif |
6470aff6 | 137 | #if defined(CONFIG_X86_64) && defined(CONFIG_NUMA) |
0d77e7f0 BG |
138 | early_per_cpu_ptr(x86_cpu_to_node_map) = NULL; |
139 | #endif | |
9f0e8d04 | 140 | |
9f248bde MT |
141 | /* Setup node to cpumask map */ |
142 | setup_node_to_cpumask_map(); | |
c2d1cec1 MT |
143 | |
144 | /* Setup cpu initialized, callin, callout masks */ | |
145 | setup_cpu_local_masks(); | |
4fe29a85 | 146 | } |